/* vi: set sw=4 ts=4: */
/*
* awk implementation for busybox
*
* Copyright (C) 2002 by Dmitry Zakharov <dmit@crp.bank.gov.ua>
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
//config:config AWK
//config: bool "awk (23 kb)"
//config: default y
//config: help
//config: Awk is used as a pattern scanning and processing language.
//config:
//config:config FEATURE_AWK_LIBM
//config: bool "Enable math functions (requires libm)"
//config: default y
//config: depends on AWK
//config: help
//config: Enable math functions of the Awk programming language.
//config: NOTE: This requires libm to be present for linking.
//config:
//config:config FEATURE_AWK_GNU_EXTENSIONS
//config: bool "Enable a few GNU extensions"
//config: default y
//config: depends on AWK
//config: help
//config: Enable a few features from gawk:
//config: * command line option -e AWK_PROGRAM
//config: * simultaneous use of -f and -e on the command line.
//config: This enables the use of awk library files.
//config: Example: awk -f mylib.awk -e '{print myfunction($1);}' ...
//applet:IF_AWK(APPLET_NOEXEC(awk, awk, BB_DIR_USR_BIN, BB_SUID_DROP, awk))
//kbuild:lib-$(CONFIG_AWK) += awk.o
//usage:#define awk_trivial_usage
//usage: "[OPTIONS] [AWK_PROGRAM] [FILE]..."
//usage:#define awk_full_usage "\n\n"
//usage: " -v VAR=VAL Set variable"
//usage: "\n -F SEP Use SEP as field separator"
//usage: "\n -f FILE Read program from FILE"
//usage: IF_FEATURE_AWK_GNU_EXTENSIONS(
//usage: "\n -e AWK_PROGRAM"
//usage: )
#include "libbb.h"
#include "xregex.h"
#include <math.h>
/* This is a NOEXEC applet. Be very careful! */
/* If you comment out one of these below, it will be #defined later
* to perform debug printfs to stderr: */
#define debug_printf_walker(...) do {} while (0)
#define debug_printf_eval(...) do {} while (0)
#define debug_printf_parse(...) do {} while (0)
#ifndef debug_printf_walker
# define debug_printf_walker(...) (fprintf(stderr, __VA_ARGS__))
#endif
#ifndef debug_printf_eval
# define debug_printf_eval(...) (fprintf(stderr, __VA_ARGS__))
#endif
#ifndef debug_printf_parse
# define debug_printf_parse(...) (fprintf(stderr, __VA_ARGS__))
#else
# define debug_parse_print_tc(...) ((void)0)
#endif
/* "+": stop on first non-option:
* $ awk 'BEGIN { for(i=1; i<ARGC; ++i) { print i ": " ARGV[i] }}' -argz
* 1: -argz
*/
#define OPTSTR_AWK "+" \
"F:v:*f:*" \
IF_FEATURE_AWK_GNU_EXTENSIONS("e:*") \
"W:"
enum {
OPTBIT_F, /* define field separator */
OPTBIT_v, /* define variable */
OPTBIT_f, /* pull in awk program from file */
IF_FEATURE_AWK_GNU_EXTENSIONS(OPTBIT_e,) /* -e AWK_PROGRAM */
OPTBIT_W, /* -W ignored */
OPT_F = 1 << OPTBIT_F,
OPT_v = 1 << OPTBIT_v,
OPT_f = 1 << OPTBIT_f,
OPT_e = IF_FEATURE_AWK_GNU_EXTENSIONS((1 << OPTBIT_e)) + 0,
OPT_W = 1 << OPTBIT_W
};
#define MAXVARFMT 240
/* variable flags */
#define VF_NUMBER 0x0001 /* 1 = primary type is number */
#define VF_ARRAY 0x0002 /* 1 = it's an array */
#define VF_CACHED 0x0100 /* 1 = num/str value has cached str/num eq */
#define VF_USER 0x0200 /* 1 = user input (may be numeric string) */
#define VF_SPECIAL 0x0400 /* 1 = requires extra handling when changed */
#define VF_WALK 0x0800 /* 1 = variable has alloc'd x.walker list */
#define VF_FSTR 0x1000 /* 1 = don't free() var::string (not malloced, or is owned by something else) */
#define VF_CHILD 0x2000 /* 1 = function arg; x.parent points to source */
#define VF_DIRTY 0x4000 /* 1 = variable was set explicitly */
/* these flags are static, don't change them when value is changed */
#define VF_DONTTOUCH (VF_ARRAY | VF_SPECIAL | VF_WALK | VF_CHILD | VF_DIRTY)
typedef struct walker_list {
char *end;
char *cur;
struct walker_list *prev;
char wbuf[1];
} walker_list;
/* Variable */
typedef struct var_s {
unsigned type; /* flags */
char *string;
double number;
union {
int aidx; /* func arg idx (for compilation stage) */
struct xhash_s *array; /* array ptr */
struct var_s *parent; /* for func args, ptr to actual parameter */
walker_list *walker; /* list of array elements (for..in) */
} x;
} var;
/* Node chain (pattern-action chain, BEGIN, END, function bodies) */
typedef struct chain_s {
struct node_s *first;
struct node_s *last;
const char *programname;
} chain;
/* Function */
typedef struct func_s {
unsigned nargs;
smallint defined;
struct chain_s body;
} func;
/* I/O stream */
typedef struct rstream_s {
FILE *F;
char *buffer;
int adv;
int size;
int pos;
smallint is_pipe;
} rstream;
typedef struct hash_item_s {
union {
struct var_s v; /* variable/array hash */
struct rstream_s rs; /* redirect streams hash */
struct func_s f; /* functions hash */
} data;
struct hash_item_s *next; /* next in chain */
char name[1]; /* really it's longer */
} hash_item;
typedef struct xhash_s {
unsigned nel; /* num of elements */
unsigned csize; /* current hash size */
unsigned nprime; /* next hash size in PRIMES[] */
unsigned glen; /* summary length of item names */
struct hash_item_s **items;
} xhash;
/* Tree node */
typedef struct node_s {
uint32_t info;
unsigned lineno;
union {
struct node_s *n;
var *v;
int aidx;
const char *new_progname;
regex_t *re;
} l;
union {
struct node_s *n;
regex_t *ire;
func *f;
} r;
union {
struct node_s *n;
} a;
} node;
typedef struct tsplitter_s {
node n;
regex_t re[2];
} tsplitter;
/* simple token classes */
/* order and hex values are very important!!! See next_token() */
#define TC_LPAREN (1 << 0) /* ( */
#define TC_RPAREN (1 << 1) /* ) */
#define TC_REGEXP (1 << 2) /* /.../ */
#define TC_OUTRDR (1 << 3) /* | > >> */
#define TC_UOPPOST (1 << 4) /* unary postfix operator ++ -- */
#define TC_UOPPRE1 (1 << 5) /* unary prefix operator ++ -- $ */
#define TC_BINOPX (1 << 6) /* two-opnd operator */
#define TC_IN (1 << 7) /* 'in' */
#define TC_COMMA (1 << 8) /* , */
#define TC_PIPE (1 << 9) /* input redirection pipe | */
#define TC_UOPPRE2 (1 << 10) /* unary prefix operator + - ! */
#define TC_ARRTERM (1 << 11) /* ] */
#define TC_LBRACE (1 << 12) /* { */
#define TC_RBRACE (1 << 13) /* } */
#define TC_SEMICOL (1 << 14) /* ; */
#define TC_NEWLINE (1 << 15)
#define TC_STATX (1 << 16) /* ctl statement (for, next...) */
#define TC_WHILE (1 << 17) /* 'while' */
#define TC_ELSE (1 << 18) /* 'else' */
#define TC_BUILTIN (1 << 19)
/* This costs ~50 bytes of code.
* A separate class to support deprecated "length" form. If we don't need that
* (i.e. if we demand that only "length()" with () is valid), then TC_LENGTH
* can be merged with TC_BUILTIN:
*/
#define TC_LENGTH (1 << 20) /* 'length' */
#define TC_GETLINE (1 << 21) /* 'getline' */
#define TC_FUNCDECL (1 << 22) /* 'function' 'func' */
#define TC_BEGIN (1 << 23) /* 'BEGIN' */
#define TC_END (1 << 24) /* 'END' */
#define TC_EOF (1 << 25)
#define TC_VARIABLE (1 << 26) /* name */
#define TC_ARRAY (1 << 27) /* name[ */
#define TC_FUNCTION (1 << 28) /* name( */
#define TC_STRING (1 << 29) /* "..." */
#define TC_NUMBER (1 << 30)
#ifndef debug_parse_print_tc
static void debug_parse_print_tc(uint32_t n)
{
if (n & TC_LPAREN ) debug_printf_parse(" LPAREN" );
if (n & TC_RPAREN ) debug_printf_parse(" RPAREN" );
if (n & TC_REGEXP ) debug_printf_parse(" REGEXP" );
if (n & TC_OUTRDR ) debug_printf_parse(" OUTRDR" );
if (n & TC_UOPPOST ) debug_printf_parse(" UOPPOST" );
if (n & TC_UOPPRE1 ) debug_printf_parse(" UOPPRE1" );
if (n & TC_BINOPX ) debug_printf_parse(" BINOPX" );
if (n & TC_IN ) debug_printf_parse(" IN" );
if (n & TC_COMMA ) debug_printf_parse(" COMMA" );
if (n & TC_PIPE ) debug_printf_parse(" PIPE" );
if (n & TC_UOPPRE2 ) debug_printf_parse(" UOPPRE2" );
if (n & TC_ARRTERM ) debug_printf_parse(" ARRTERM" );
if (n & TC_LBRACE ) debug_printf_parse(" LBRACE" );
if (n & TC_RBRACE ) debug_printf_parse(" RBRACE" );
if (n & TC_SEMICOL ) debug_printf_parse(" SEMICOL" );
if (n & TC_NEWLINE ) debug_printf_parse(" NEWLINE" );
if (n & TC_STATX ) debug_printf_parse(" STATX" );
if (n & TC_WHILE ) debug_printf_parse(" WHILE" );
if (n & TC_ELSE ) debug_printf_parse(" ELSE" );
if (n & TC_BUILTIN ) debug_printf_parse(" BUILTIN" );
if (n & TC_LENGTH ) debug_printf_parse(" LENGTH" );
if (n & TC_GETLINE ) debug_printf_parse(" GETLINE" );
if (n & TC_FUNCDECL) debug_printf_parse(" FUNCDECL");
if (n & TC_BEGIN ) debug_printf_parse(" BEGIN" );
if (n & TC_END ) debug_printf_parse(" END" );
if (n & TC_EOF ) debug_printf_parse(" EOF" );
if (n & TC_VARIABLE) debug_printf_parse(" VARIABLE");
if (n & TC_ARRAY ) debug_printf_parse(" ARRAY" );
if (n & TC_FUNCTION) debug_printf_parse(" FUNCTION");
if (n & TC_STRING ) debug_printf_parse(" STRING" );
if (n & TC_NUMBER ) debug_printf_parse(" NUMBER" );
}
#endif
/* combined token classes ("token [class] sets") */
#define TS_UOPPRE (TC_UOPPRE1 | TC_UOPPRE2)
#define TS_BINOP (TC_BINOPX | TC_COMMA | TC_PIPE | TC_IN)
//#define TS_UNARYOP (TS_UOPPRE | TC_UOPPOST)
#define TS_OPERAND (TC_VARIABLE | TC_ARRAY | TC_FUNCTION \
| TC_BUILTIN | TC_LENGTH | TC_GETLINE \
| TC_LPAREN | TC_STRING | TC_NUMBER)
#define TS_LVALUE (TC_VARIABLE | TC_ARRAY)
#define TS_STATEMNT (TC_STATX | TC_WHILE)
/* word tokens, cannot mean something else if not expected */
#define TS_WORD (TC_IN | TS_STATEMNT | TC_ELSE \
| TC_BUILTIN | TC_LENGTH | TC_GETLINE \
| TC_FUNCDECL | TC_BEGIN | TC_END)
/* discard newlines after these */
#define TS_NOTERM (TS_BINOP | TC_COMMA | TC_LBRACE | TC_RBRACE \
| TC_SEMICOL | TC_NEWLINE)
/* what can expression begin with */
#define TS_OPSEQ (TS_OPERAND | TS_UOPPRE | TC_REGEXP)
/* what can group begin with */
#define TS_GRPSEQ (TS_OPSEQ | TS_STATEMNT \
| TC_SEMICOL | TC_NEWLINE | TC_LBRACE)
/* if previous token class is CONCAT_L and next is CONCAT_R, concatenation */
/* operator is inserted between them */
#define TS_CONCAT_L (TC_VARIABLE | TC_ARRTERM | TC_RPAREN \
| TC_STRING | TC_NUMBER | TC_UOPPOST \
| TC_LENGTH)
#define TS_CONCAT_R (TS_OPERAND | TS_UOPPRE)
#define OF_RES1 0x010000
#define OF_RES2 0x020000
#define OF_STR1 0x040000
#define OF_STR2 0x080000
#define OF_NUM1 0x100000
#define OF_CHECKED 0x200000
#define OF_REQUIRED 0x400000
/* combined operator flags */
#define xx 0
#define xV OF_RES2
#define xS (OF_RES2 | OF_STR2)
#define Vx OF_RES1
#define Rx OF_REQUIRED
#define VV (OF_RES1 | OF_RES2)
#define Nx (OF_RES1 | OF_NUM1)
#define NV (OF_RES1 | OF_NUM1 | OF_RES2)
#define Sx (OF_RES1 | OF_STR1)
#define SV (OF_RES1 | OF_STR1 | OF_RES2)
#define SS (OF_RES1 | OF_STR1 | OF_RES2 | OF_STR2)
#define OPCLSMASK 0xFF00
#define OPNMASK 0x007F
/* operator priority is a highest byte (even: r->l, odd: l->r grouping)
* (for builtins it has different meaning)
*/
#undef P
#undef PRIMASK
#undef PRIMASK2
#define P(x) (x << 24)
#define PRIMASK 0x7F000000
#define PRIMASK2 0x7E000000
/* Operation classes */
#define SHIFT_TIL_THIS 0x0600
#define RECUR_FROM_THIS 0x1000
enum {
OC_DELETE = 0x0100, OC_EXEC = 0x0200, OC_NEWSOURCE = 0x0300,
OC_PRINT = 0x0400, OC_PRINTF = 0x0500, OC_WALKINIT = 0x0600,
OC_BR = 0x0700, OC_BREAK = 0x0800, OC_CONTINUE = 0x0900,
OC_EXIT = 0x0a00, OC_NEXT = 0x0b00, OC_NEXTFILE = 0x0c00,
OC_TEST = 0x0d00, OC_WALKNEXT = 0x0e00,
OC_BINARY = 0x1000, OC_BUILTIN = 0x1100, OC_COLON = 0x1200,
OC_COMMA = 0x1300, OC_COMPARE = 0x1400, OC_CONCAT = 0x1500,
OC_FBLTIN = 0x1600, OC_FIELD = 0x1700, OC_FNARG = 0x1800,
OC_FUNC = 0x1900, OC_GETLINE = 0x1a00, OC_IN = 0x1b00,
OC_LAND = 0x1c00, OC_LOR = 0x1d00, OC_MATCH = 0x1e00,
OC_MOVE = 0x1f00, OC_PGETLINE = 0x2000, OC_REGEXP = 0x2100,
OC_REPLACE = 0x2200, OC_RETURN = 0x2300, OC_SPRINTF = 0x2400,
OC_TERNARY = 0x2500, OC_UNARY = 0x2600, OC_VAR = 0x2700,
OC_DONE = 0x2800,
ST_IF = 0x3000, ST_DO = 0x3100, ST_FOR = 0x3200,
ST_WHILE = 0x3300
};
/* simple builtins */
enum {
F_in, F_rn, F_co, F_ex, F_lg, F_si, F_sq, F_sr,
F_ti, F_le, F_sy, F_ff, F_cl
};
/* builtins */
enum {
B_a2, B_ix, B_ma, B_sp, B_ss, B_ti, B_mt, B_lo, B_up,
B_ge, B_gs, B_su,
B_an, B_co, B_ls, B_or, B_rs, B_xo,
};
/* tokens and their corresponding info values */
#define NTC "\377" /* switch to next token class (tc<<1) */
#define NTCC '\377'
static const char tokenlist[] ALIGN1 =
"\1(" NTC /* TC_LPAREN */
"\1)" NTC /* TC_RPAREN */
"\1/" NTC /* TC_REGEXP */
"\2>>" "\1>" "\1|" NTC /* TC_OUTRDR */
"\2++" "\2--" NTC /* TC_UOPPOST */
"\2++" "\2--" "\1$" NTC /* TC_UOPPRE1 */
"\2==" "\1=" "\2+=" "\2-=" /* TC_BINOPX */
"\2*=" "\2/=" "\2%=" "\2^="
"\1+" "\1-" "\3**=" "\2**"
"\1/" "\1%" "\1^" "\1*"
"\2!=" "\2>=" "\2<=" "\1>"
"\1<" "\2!~" "\1~" "\2&&"
"\2||" "\1?" "\1:" NTC
"\2in" NTC /* TC_IN */
"\1," NTC /* TC_COMMA */
"\1|" NTC /* TC_PIPE */
"\1+" "\1-" "\1!" NTC /* TC_UOPPRE2 */
"\1]" NTC /* TC_ARRTERM */
"\1{" NTC /* TC_LBRACE */
"\1}" NTC /* TC_RBRACE */
"\1;" NTC /* TC_SEMICOL */
"\1\n" NTC /* TC_NEWLINE */
"\2if" "\2do" "\3for" "\5break" /* TC_STATX */
"\10continue" "\6delete" "\5print"
"\6printf" "\4next" "\10nextfile"
"\6return" "\4exit" NTC
"\5while" NTC /* TC_WHILE */
"\4else" NTC /* TC_ELSE */
"\3and" "\5compl" "\6lshift" "\2or" /* TC_BUILTIN */
"\6rshift" "\3xor"
"\5close" "\6system" "\6fflush" "\5atan2"
"\3cos" "\3exp" "\3int" "\3log"
"\4rand" "\3sin" "\4sqrt" "\5srand"
"\6gensub" "\4gsub" "\5index" /* "\6length" was here */
"\5match" "\5split" "\7sprintf" "\3sub"
"\6substr" "\7systime" "\10strftime" "\6mktime"
"\7tolower" "\7toupper" NTC
"\6length" NTC /* TC_LENGTH */
"\7getline" NTC /* TC_GETLINE */
"\4func" "\10function" NTC /* TC_FUNCDECL */
"\5BEGIN" NTC /* TC_BEGIN */
"\3END" /* TC_END */
/* compiler adds trailing "\0" */
;
static const uint32_t tokeninfo[] ALIGN4 = {
0,
0,
#define TI_REGEXP OC_REGEXP
TI_REGEXP,
xS|'a', xS|'w', xS|'|',
OC_UNARY|xV|P(9)|'p', OC_UNARY|xV|P(9)|'m',
#define TI_PREINC (OC_UNARY|xV|P(9)|'P')
#define TI_PREDEC (OC_UNARY|xV|P(9)|'M')
TI_PREINC, TI_PREDEC, OC_FIELD|xV|P(5),
OC_COMPARE|VV|P(39)|5, OC_MOVE|VV|P(74), OC_REPLACE|NV|P(74)|'+', OC_REPLACE|NV|P(74)|'-',
OC_REPLACE|NV|P(74)|'*', OC_REPLACE|NV|P(74)|'/', OC_REPLACE|NV|P(74)|'%', OC_REPLACE|NV|P(74)|'&',
OC_BINARY|NV|P(29)|'+', OC_BINARY|NV|P(29)|'-', OC_REPLACE|NV|P(74)|'&', OC_BINARY|NV|P(15)|'&',
OC_BINARY|NV|P(25)|'/', OC_BINARY|NV|P(25)|'%', OC_BINARY|NV|P(15)|'&', OC_BINARY|NV|P(25)|'*',
OC_COMPARE|VV|P(39)|4, OC_COMPARE|VV|P(39)|3, OC_COMPARE|VV|P(39)|0, OC_COMPARE|VV|P(39)|1,
#define TI_LESS (OC_COMPARE|VV|P(39)|2)
TI_LESS, OC_MATCH|Sx|P(45)|'!', OC_MATCH|Sx|P(45)|'~', OC_LAND|Vx|P(55),
#define TI_TERNARY (OC_TERNARY|Vx|P(64)|'?')
#define TI_COLON (OC_COLON|xx|P(67)|':')
OC_LOR|Vx|P(59), TI_TERNARY, TI_COLON,
#define TI_IN (OC_IN|SV|P(49))
TI_IN,
#define TI_COMMA (OC_COMMA|SS|P(80))
TI_COMMA,
#define TI_PGETLINE (OC_PGETLINE|SV|P(37))
TI_PGETLINE,
OC_UNARY|xV|P(19)|'+', OC_UNARY|xV|P(19)|'-', OC_UNARY|xV|P(19)|'!',
0, /* ] */
0,
0,
0,
0, /* \n */
ST_IF, ST_DO, ST_FOR, OC_BREAK,
OC_CONTINUE, OC_DELETE|Rx, OC_PRINT,
OC_PRINTF, OC_NEXT, OC_NEXTFILE,
OC_RETURN|Vx, OC_EXIT|Nx,
ST_WHILE,
0, /* else */
// OC_B's are builtins with enforced minimum number of arguments (two upper bits).
// Highest byte bit pattern: nn s3s2s1 v3v2v1
// nn - min. number of args, sN - resolve Nth arg to string, vN - resolve to var
// OC_F's are builtins with zero or one argument.
// |Rx| enforces that arg is present for: system, close, cos, sin, exp, int, log, sqrt
// Check for no args is present in builtins' code (not in this table): rand, systime
// Have one _optional_ arg: fflush, srand, length
#define OC_B OC_BUILTIN
#define OC_F OC_FBLTIN
#define A1 P(0x40) /*one arg*/
#define A2 P(0x80) /*two args*/
#define A3 P(0xc0) /*three args*/
#define __v P(1)
#define _vv P(3)
#define __s__v P(9)
#define __s_vv P(0x0b)
#define __svvv P(0x0f)
#define _ss_vv P(0x1b)
#define _s_vv_ P(0x16)
#define ss_vv_ P(0x36)
OC_B|B_an|_vv|A2, OC_B|B_co|__v|A1, OC_B|B_ls|_vv|A2, OC_B|B_or|_vv|A2, // and compl lshift or
OC_B|B_rs|_vv|A2, OC_B|B_xo|_vv|A2, // rshift xor
OC_F|F_cl|Sx|Rx, OC_F|F_sy|Sx|Rx, OC_F|F_ff|Sx, OC_B|B_a2|_vv|A2, // close system fflush atan2
OC_F|F_co|Nx|Rx, OC_F|F_ex|Nx|Rx, OC_F|F_in|Nx|Rx, OC_F|F_lg|Nx|Rx, // cos exp int log
OC_F|F_rn, OC_F|F_si|Nx|Rx, OC_F|F_sq|Nx|Rx, OC_F|F_sr|Nx, // rand sin sqrt srand
OC_B|B_ge|_s_vv_|A3,OC_B|B_gs|ss_vv_|A2,OC_B|B_ix|_ss_vv|A2, // gensub gsub index /*length was here*/
OC_B|B_ma|__s__v|A2,OC_B|B_sp|__s_vv|A2,OC_SPRINTF, OC_B|B_su|ss_vv_|A2,// match split sprintf sub
OC_B|B_ss|__svvv|A2,OC_F|F_ti, OC_B|B_ti|__s_vv, OC_B|B_mt|__s_vv, // substr systime strftime mktime
OC_B|B_lo|__s__v|A1,OC_B|B_up|__s__v|A1, // tolower toupper
OC_F|F_le|Sx, // length
OC_GETLINE|SV, // getline
0, 0, // func function
0, // BEGIN
0 // END
#undef A1
#undef A2
#undef A3
#undef OC_B
#undef OC_F
};
/* internal variable names and their initial values */
/* asterisk marks SPECIAL vars; $ is just no-named Field0 */
enum {
CONVFMT, OFMT, FS, OFS,
ORS, RS, RT, FILENAME,
SUBSEP, F0, ARGIND, ARGC,
ARGV, ERRNO, FNR, NR,
NF, IGNORECASE, ENVIRON, NUM_INTERNAL_VARS
};
static const char vNames[] ALIGN1 =
"CONVFMT\0" "OFMT\0" "FS\0*" "OFS\0"
"ORS\0" "RS\0*" "RT\0" "FILENAME\0"
"SUBSEP\0" "$\0*" "ARGIND\0" "ARGC\0"
"ARGV\0" "ERRNO\0" "FNR\0" "NR\0"
"NF\0*" "IGNORECASE\0*" "ENVIRON\0" "\0";
static const char vValues[] ALIGN1 =
"%.6g\0" "%.6g\0" " \0" " \0"
"\n\0" "\n\0" "\0" "\0"
"\034\0" "\0" "\377";
/* hash size may grow to these values */
#define FIRST_PRIME 61
static const uint16_t PRIMES[] ALIGN2 = { 251, 1021, 4093, 16381, 65521 };
/* Globals. Split in two parts so that first one is addressed
* with (mostly short) negative offsets.
* NB: it's unsafe to put members of type "double"
* into globals2 (gcc may fail to align them).
*/
struct globals {
double t_double;
chain beginseq, mainseq, endseq;
chain *seq;
node *break_ptr, *continue_ptr;
rstream *iF;
xhash *ahash; /* argument names, used only while parsing function bodies */
xhash *fnhash; /* function names, used only in parsing stage */
xhash *vhash; /* variables and arrays */
//xhash *fdhash; /* file objects, used only in execution stage */
//we are reusing ahash as fdhash, via define (see later)
const char *g_progname;
int g_lineno;
int nfields;
int maxfields; /* used in fsrealloc() only */
var *Fields;
char *g_pos;
char g_saved_ch;
smallint icase;
smallint exiting;
smallint nextrec;
smallint nextfile;
smallint is_f0_split;
smallint t_rollback;
/* former statics from various functions */
smallint next_token__concat_inserted;
uint32_t next_token__save_tclass;
uint32_t next_token__save_info;
};
struct globals2 {
uint32_t t_info; /* often used */
uint32_t t_tclass;
char *t_string;
int t_lineno;
var *intvar[NUM_INTERNAL_VARS]; /* often used */
/* former statics from various functions */
char *split_f0__fstrings;
rstream next_input_file__rsm;
smallint next_input_file__files_happen;
smalluint exitcode;
unsigned evaluate__seed;
var *evaluate__fnargs;
regex_t evaluate__sreg;
var ptest__tmpvar;
var awk_printf__tmpvar;
var as_regex__tmpvar;
var exit__tmpvar;
var main__tmpvar;
tsplitter exec_builtin__tspl;
/* biggest and least used members go last */
tsplitter fsplitter, rsplitter;
char g_buf[MAXVARFMT + 1];
};
#define G1 (ptr_to_globals[-1])
#define G (*(struct globals2 *)ptr_to_globals)
/* For debug. nm --size-sort awk.o | grep -vi ' [tr] ' */
//char G1size[sizeof(G1)]; // 0x70
//char Gsize[sizeof(G)]; // 0x2f8
/* Trying to keep most of members accessible with short offsets: */
//char Gofs_seed[offsetof(struct globals2, evaluate__seed)]; // 0x7c
#define t_double (G1.t_double )
#define beginseq (G1.beginseq )
#define mainseq (G1.mainseq )
#define endseq (G1.endseq )
#define seq (G1.seq )
#define break_ptr (G1.break_ptr )
#define continue_ptr (G1.continue_ptr)
#define iF (G1.iF )
#define ahash (G1.ahash )
#define fnhash (G1.fnhash )
#define vhash (G1.vhash )
#define fdhash ahash
//^^^^^^^^^^^^^^^^^^ ahash is cleared after every function parsing,
// and ends up empty after parsing phase. Thus, we can simply reuse it
// for fdhash in execution stage.
#define g_progname (G1.g_progname )
#define g_lineno (G1.g_lineno )
#define nfields (G1.nfields )
#define maxfields (G1.maxfields )
#define Fields (G1.Fields )
#define g_pos (G1.g_pos )
#define g_saved_ch (G1.g_saved_ch )
#define icase (G1.icase )
#define exiting (G1.exiting )
#define nextrec (G1.nextrec )
#define nextfile (G1.nextfile )
#define is_f0_split (G1.is_f0_split )
#define t_rollback (G1.t_rollback )
#define t_info (G.t_info )
#define t_tclass (G.t_tclass )
#define t_string (G.t_string )
#define t_lineno (G.t_lineno )
#define intvar (G.intvar )
#define fsplitter (G.fsplitter )
#define rsplitter (G.rsplitter )
#define g_buf (G.g_buf )
#define INIT_G() do { \
SET_PTR_TO_GLOBALS((char*)xzalloc(sizeof(G1)+sizeof(G)) + sizeof(G1)); \
t_tclass = TC_NEWLINE; \
G.evaluate__seed = 1; \
} while (0)
static const char EMSG_UNEXP_EOS[] ALIGN1 = "Unexpected end of string";
static const char EMSG_UNEXP_TOKEN[] ALIGN1 = "Unexpected token";
static const char EMSG_DIV_BY_ZERO[] ALIGN1 = "Division by zero";
static const char EMSG_INV_FMT[] ALIGN1 = "Invalid format specifier";
static const char EMSG_TOO_FEW_ARGS[] ALIGN1 = "Too few arguments";
static const char EMSG_NOT_ARRAY[] ALIGN1 = "Not an array";
static const char EMSG_POSSIBLE_ERROR[] ALIGN1 = "Possible syntax error";
static const char EMSG_UNDEF_FUNC[] ALIGN1 = "Call to undefined function";
static const char EMSG_NO_MATH[] ALIGN1 = "Math support is not compiled in";
static const char EMSG_NEGATIVE_FIELD[] ALIGN1 = "Access to negative field";
static int awk_exit(void) NORETURN;
static void syntax_error(const char *message) NORETURN;
static void syntax_error(const char *message)
{
bb_error_msg_and_die("%s:%i: %s", g_progname, g_lineno, message);
}
/* ---- hash stuff ---- */
static unsigned hashidx(const char *name)
{
unsigned idx = 0;
while (*name)
idx = *name++ + (idx << 6) - idx;
return idx;
}
/* create new hash */
static xhash *hash_init(void)
{
xhash *newhash;
newhash = xzalloc(sizeof(*newhash));
newhash->csize = FIRST_PRIME;
newhash->items = xzalloc(FIRST_PRIME * sizeof(newhash->items[0]));
return newhash;
}
static void hash_clear(xhash *hash)
{
unsigned i;
hash_item *hi, *thi;
for (i = 0; i < hash->csize; i++) {
hi = hash->items[i];
while (hi) {
thi = hi;
hi = hi->next;
//FIXME: this assumes that it's a hash of *variables*:
free(thi->data.v.string);
free(thi);
}
hash->items[i] = NULL;
}
hash->glen = hash->nel = 0;
}
#if 0 //UNUSED
static void hash_free(xhash *hash)
{
hash_clear(hash);
free(hash->items);
free(hash);
}
#endif
/* find item in hash, return ptr to data, NULL if not found */
static NOINLINE void *hash_search3(xhash *hash, const char *name, unsigned idx)
{
hash_item *hi;
hi = hash->items[idx % hash->csize];
while (hi) {
if (strcmp(hi->name, name) == 0)
return &hi->data;
hi = hi->next;
}
return NULL;
}
static void *hash_search(xhash *hash, const char *name)
{
return hash_search3(hash, name, hashidx(name));
}
/* grow hash if it becomes too big */
static void hash_rebuild(xhash *hash)
{
unsigned newsize, i, idx;
hash_item **newitems, *hi, *thi;
if (hash->nprime == ARRAY_SIZE(PRIMES))
return;
newsize = PRIMES[hash->nprime++];
newitems = xzalloc(newsize * sizeof(newitems[0]));
for (i = 0; i < hash->csize; i++) {
hi = hash->items[i];
while (hi) {
thi = hi;
hi = thi->next;
idx = hashidx(thi->name) % newsize;
thi->next = newitems[idx];
newitems[idx] = thi;
}
}
free(hash->items);
hash->csize = newsize;
hash->items = newitems;
}
/* find item in hash, add it if necessary. Return ptr to data */
static void *hash_find(xhash *hash, const char *name)
{
hash_item *hi;
unsigned idx;
int l;
idx = hashidx(name);
hi = hash_search3(hash, name, idx);
if (!hi) {
if (++hash->nel > hash->csize * 8)
hash_rebuild(hash);
l = strlen(name) + 1;
hi = xzalloc(sizeof(*hi) + l);
strcpy(hi->name, name);
idx = idx % hash->csize;
hi->next = hash->items[idx];
hash->items[idx] = hi;
hash->glen += l;
}
return &hi->data;
}
#define findvar(hash, name) ((var*) hash_find((hash), (name)))
#define newvar(name) ((var*) hash_find(vhash, (name)))
#define newfile(name) ((rstream*)hash_find(fdhash, (name)))
#define newfunc(name) ((func*) hash_find(fnhash, (name)))
static void hash_remove(xhash *hash, const char *name)
{
hash_item *hi, **phi;
phi = &hash->items[hashidx(name) % hash->csize];
while (*phi) {
hi = *phi;
if (strcmp(hi->name, name) == 0) {
hash->glen -= (strlen(name) + 1);
hash->nel--;
*phi = hi->next;
free(hi);
break;
}
phi = &hi->next;
}
}
/* ------ some useful functions ------ */
static char *skip_spaces(char *p)
{
for (;;) {
if (*p == '\\' && p[1] == '\n') {
p++;
t_lineno++;
} else if (*p != ' ' && *p != '\t') {
break;
}
p++;
}
return p;
}
/* returns old *s, advances *s past word and terminating NUL */
static char *nextword(char **s)
{
char *p = *s;
char *q = p;
while (*q++ != '\0')
continue;
*s = q;
return p;
}
static char nextchar(char **s)
{
char c, *pps;
c = *(*s)++;
pps = *s;
if (c == '\\')
c = bb_process_escape_sequence((const char**)s);
/* Example awk statement:
* s = "abc\"def"
* we must treat \" as "
*/
if (c == '\\' && *s == pps) { /* unrecognized \z? */
c = *(*s); /* yes, fetch z */
if (c)
(*s)++; /* advance unless z = NUL */
}
return c;
}
/* TODO: merge with strcpy_and_process_escape_sequences()?
*/
static void unescape_string_in_place(char *s1)
{
char *s = s1;
while ((*s1 = nextchar(&s)) != '\0')
s1++;
}
static ALWAYS_INLINE int isalnum_(int c)
{
return (isalnum(c) || c == '_');
}
static double my_strtod(char **pp)
{
char *cp = *pp;
if (ENABLE_DESKTOP && cp[0] == '0') {
/* Might be hex or octal integer: 0x123abc or 07777 */
char c = (cp[1] | 0x20);
if (c == 'x' || isdigit(cp[1])) {
unsigned long long ull = strtoull(cp, pp, 0);
if (c == 'x')
return ull;
c = **pp;
if (!isdigit(c) && c != '.')
return ull;
/* else: it may be a floating number. Examples:
* 009.123 (*pp points to '9')
* 000.123 (*pp points to '.')
* fall through to strtod.
*/
}
}
return strtod(cp, pp);
}
/* -------- working with variables (set/get/copy/etc) -------- */
static void fmt_num(const char *format, double n)
{
if (n == (long long)n) {
snprintf(g_buf, MAXVARFMT, "%lld", (long long)n);
} else {
const char *s = format;
char c;
do { c = *s; } while (c && *++s);
if (strchr("diouxX", c)) {
snprintf(g_buf, MAXVARFMT, format, (int)n);
} else if (strchr("eEfFgGaA", c)) {
snprintf(g_buf, MAXVARFMT, format, n);
} else {
syntax_error(EMSG_INV_FMT);
}
}
}
static xhash *iamarray(var *a)
{
while (a->type & VF_CHILD)
a = a->x.parent;
if (!(a->type & VF_ARRAY)) {
a->type |= VF_ARRAY;
a->x.array = hash_init();
}
return a->x.array;
}
#define clear_array(array) hash_clear(array)
/* clear a variable */
static var *clrvar(var *v)
{
if (!(v->type & VF_FSTR))
free(v->string);
v->type &= VF_DONTTOUCH;
v->type |= VF_DIRTY;
v->string = NULL;
return v;
}
static void handle_special(var *);
/* assign string value to variable */
static var *setvar_p(var *v, char *value)
{
clrvar(v);
v->string = value;
handle_special(v);
return v;
}
/* same as setvar_p but make a copy of string */
static var *setvar_s(var *v, const char *value)
{
return setvar_p(v, (value && *value) ? xstrdup(value) : NULL);
}
/* same as setvar_s but sets USER flag */
static var *setvar_u(var *v, const char *value)
{
v = setvar_s(v, value);
v->type |= VF_USER;
return v;
}
/* set array element to user string */
static void setari_u(var *a, int idx, const char *s)
{
var *v;
v = findvar(iamarray(a), itoa(idx));
setvar_u(v, s);
}
/* assign numeric value to variable */
static var *setvar_i(var *v, double value)
{
clrvar(v);
v->type |= VF_NUMBER;
v->number = value;
handle_special(v);
return v;
}
static const char *getvar_s(var *v)
{
/* if v is numeric and has no cached string, convert it to string */
if ((v->type & (VF_NUMBER | VF_CACHED)) == VF_NUMBER) {
fmt_num(getvar_s(intvar[CONVFMT]), v->number);
v->string = xstrdup(g_buf);
v->type |= VF_CACHED;
}
return (v->string == NULL) ? "" : v->string;
}
static double getvar_i(var *v)
{
char *s;
if ((v->type & (VF_NUMBER | VF_CACHED)) == 0) {
v->number = 0;
s = v->string;
if (s && *s) {
debug_printf_eval("getvar_i: '%s'->", s);
v->number = my_strtod(&s);
debug_printf_eval("%f (s:'%s')\n", v->number, s);
if (v->type & VF_USER) {
//TODO: skip_spaces() also skips backslash+newline, is it intended here?
s = skip_spaces(s);
if (*s != '\0')
v->type &= ~VF_USER;
}
} else {
debug_printf_eval("getvar_i: '%s'->zero\n", s);
v->type &= ~VF_USER;
}
v->type |= VF_CACHED;
}
debug_printf_eval("getvar_i: %f\n", v->number);
return v->number;
}
/* Used for operands of bitwise ops */
static unsigned long getvar_i_int(var *v)
{
double d = getvar_i(v);
/* Casting doubles to longs is undefined for values outside
* of target type range. Try to widen it as much as possible */
if (d >= 0)
return (unsigned long)d;
/* Why? Think about d == -4294967295.0 (assuming 32bit longs) */
return - (long) (unsigned long) (-d);
}
static var *copyvar(var *dest, const var *src)
{
if (dest != src) {
clrvar(dest);
dest->type |= (src->type & ~(VF_DONTTOUCH | VF_FSTR));
debug_printf_eval("copyvar: number:%f string:'%s'\n", src->number, src->string);
dest->number = src->number;
if (src->string)
dest->string = xstrdup(src->string);
}
handle_special(dest);
return dest;
}
static var *incvar(var *v)
{
return setvar_i(v, getvar_i(v) + 1.0);
}
/* return true if v is number or numeric string */
static int is_numeric(var *v)
{
getvar_i(v);
return ((v->type ^ VF_DIRTY) & (VF_NUMBER | VF_USER | VF_DIRTY));
}
/* return 1 when value of v corresponds to true, 0 otherwise */
static int istrue(var *v)
{
if (is_numeric(v))
return (v->number != 0);
return (v->string && v->string[0]);
}
/* ------- awk program text parsing ------- */
/* Parse next token pointed by global pos, place results into global t_XYZ variables.
* If token isn't expected, print error message and die.
* Return token class (also store it in t_tclass).
*/
static uint32_t next_token(uint32_t expected)
{
#define concat_inserted (G1.next_token__concat_inserted)
#define save_tclass (G1.next_token__save_tclass)
#define save_info (G1.next_token__save_info)
char *p;
const char *tl;
const uint32_t *ti;
uint32_t tc, last_token_class;
last_token_class = t_tclass; /* t_tclass is initialized to TC_NEWLINE */
debug_printf_parse("%s() expected(%x):", __func__, expected);
debug_parse_print_tc(expected);
debug_printf_parse("\n");
if (t_rollback) {
debug_printf_parse("%s: using rolled-back token\n", __func__);
t_rollback = FALSE;
} else if (concat_inserted) {
debug_printf_parse("%s: using concat-inserted token\n", __func__);
concat_inserted = FALSE;
t_tclass = save_tclass;
t_info = save_info;
} else {
p = g_pos;
if (g_saved_ch != '\0') {
*p = g_saved_ch;
g_saved_ch = '\0';
}
readnext:
p = skip_spaces(p);
g_lineno = t_lineno;
if (*p == '#')
while (*p != '\n' && *p != '\0')
p++;
if (*p == '\0') {
tc = TC_EOF;
debug_printf_parse("%s: token found: TC_EOF\n", __func__);
} else if (*p == '\"') {
/* it's a string */
char *s = t_string = ++p;
while (*p != '\"') {
char *pp;
if (*p == '\0' || *p == '\n')
syntax_error(EMSG_UNEXP_EOS);
pp = p;
*s++ = nextchar(&pp);
p = pp;
}
p++;
*s = '\0';
tc = TC_STRING;
debug_printf_parse("%s: token found:'%s' TC_STRING\n", __func__, t_string);
} else if ((expected & TC_REGEXP) && *p == '/') {
/* it's regexp */
char *s = t_string = ++p;
while (*p != '/') {
if (*p == '\0' || *p == '\n')
syntax_error(EMSG_UNEXP_EOS);
*s = *p++;
if (*s++ == '\\') {
char *pp = p;
s[-1] = bb_process_escape_sequence((const char **)&pp);
if (*p == '\\')
*s++ = '\\';
if (pp == p)
*s++ = *p++;
else
p = pp;
}
}
p++;
*s = '\0';
tc = TC_REGEXP;
debug_printf_parse("%s: token found:'%s' TC_REGEXP\n", __func__, t_string);
} else if (*p == '.' || isdigit(*p)) {
/* it's a number */
char *pp = p;
t_double = my_strtod(&pp);
p = pp;
if (*p == '.')
syntax_error(EMSG_UNEXP_TOKEN);
tc = TC_NUMBER;
debug_printf_parse("%s: token found:%f TC_NUMBER\n", __func__, t_double);
} else {
char *end_of_name;
if (*p == '\n')
t_lineno++;
/* search for something known */
tl = tokenlist;
tc = 0x00000001;
ti = tokeninfo;
while (*tl) {
int l = (unsigned char) *tl++;
if (l == (unsigned char) NTCC) {
tc <<= 1;
continue;
}
/* if token class is expected,
* token matches,
* and it's not a longer word,
*/
if ((tc & (expected | TS_WORD | TC_NEWLINE))
&& strncmp(p, tl, l) == 0
&& !((tc & TS_WORD) && isalnum_(p[l]))
) {
/* then this is what we are looking for */
t_info = *ti;
debug_printf_parse("%s: token found:'%.*s' t_info:%x\n", __func__, l, p, t_info);
p += l;
goto token_found;
}
ti++;
tl += l;
}
/* not a known token */
/* is it a name? (var/array/function) */
if (!isalnum_(*p))
syntax_error(EMSG_UNEXP_TOKEN); /* no */
/* yes */
t_string = p;
while (isalnum_(*p))
p++;
end_of_name = p;
if (last_token_class == TC_FUNCDECL)
/* eat space in "function FUNC (...) {...}" declaration */
p = skip_spaces(p);
else if (expected & TC_ARRAY) {
/* eat space between array name and [ */
char *s = skip_spaces(p);
if (*s == '[') /* array ref, not just a name? */
p = s;
}
/* else: do NOT consume whitespace after variable name!
* gawk allows definition "function FUNC (p) {...}" - note space,
* but disallows the call "FUNC (p)" because it isn't one -
* expression "v (a)" should NOT be parsed as TC_FUNCTION:
* it is a valid concatenation if "v" is a variable,
* not a function name (and type of name is not known at parse time).
*/
if (*p == '(') {
p++;
tc = TC_FUNCTION;
debug_printf_parse("%s: token found:'%s' TC_FUNCTION\n", __func__, t_string);
} else if (*p == '[') {
p++;
tc = TC_ARRAY;
debug_printf_parse("%s: token found:'%s' TC_ARRAY\n", __func__, t_string);
} else {
tc = TC_VARIABLE;
debug_printf_parse("%s: token found:'%s' TC_VARIABLE\n", __func__, t_string);
if (end_of_name == p) {
/* there is no space for trailing NUL in t_string!
* We need to save the char we are going to NUL.
* (we'll use it in future call to next_token())
*/
g_saved_ch = *end_of_name;
// especially pathological example is V="abc"; V.2 - it's V concatenated to .2
// (it evaluates to "abc0.2"). Because of this case, we can't simply cache
// '.' and analyze it later: we also have to *store it back* in next
// next_token(), in order to give my_strtod() the undamaged ".2" string.
}
}
*end_of_name = '\0'; /* terminate t_string */
}
token_found:
g_pos = p;
/* skipping newlines in some cases */
if ((last_token_class & TS_NOTERM) && (tc & TC_NEWLINE))
goto readnext;
/* insert concatenation operator when needed */
debug_printf_parse("%s: concat_inserted if all nonzero: %x %x %x %x\n", __func__,
(last_token_class & TS_CONCAT_L), (tc & TS_CONCAT_R), (expected & TS_BINOP),
!(last_token_class == TC_LENGTH && tc == TC_LPAREN));
if ((last_token_class & TS_CONCAT_L) && (tc & TS_CONCAT_R) && (expected & TS_BINOP)
&& !(last_token_class == TC_LENGTH && tc == TC_LPAREN) /* but not for "length(..." */
) {
concat_inserted = TRUE;
save_tclass = tc;
save_info = t_info;
tc = TC_BINOPX;
t_info = OC_CONCAT | SS | P(35);
}
t_tclass = tc;
debug_printf_parse("%s: t_tclass=tc=%x\n", __func__, tc);
}
/* Are we ready for this? */
if (!(t_tclass & expected)) {
syntax_error((last_token_class & (TC_NEWLINE | TC_EOF)) ?
EMSG_UNEXP_EOS : EMSG_UNEXP_TOKEN);
}
debug_printf_parse("%s: returning, t_double:%f t_tclass:", __func__, t_double);
debug_parse_print_tc(t_tclass);
debug_printf_parse("\n");
return t_tclass;
#undef concat_inserted
#undef save_tclass
#undef save_info
}
static ALWAYS_INLINE void rollback_token(void)
{
t_rollback = TRUE;
}
static node *new_node(uint32_t info)
{
node *n;
n = xzalloc(sizeof(node));
n->info = info;
n->lineno = g_lineno;
return n;
}
static void mk_re_node(const char *s, node *n, regex_t *re)
{
n->info = TI_REGEXP;
n->l.re = re;
n->r.ire = re + 1;
xregcomp(re, s, REG_EXTENDED);
xregcomp(re + 1, s, REG_EXTENDED | REG_ICASE);
}
static node *parse_expr(uint32_t);
static node *parse_lrparen_list(void)
{
next_token(TC_LPAREN);
return parse_expr(TC_RPAREN);
}
/* parse expression terminated by given argument, return ptr
* to built subtree. Terminator is eaten by parse_expr */
static node *parse_expr(uint32_t term_tc)
{
node sn;
node *cn = &sn;
node *vn, *glptr;
uint32_t tc, expected_tc;
var *v;
debug_printf_parse("%s() term_tc(%x):", __func__, term_tc);
debug_parse_print_tc(term_tc);
debug_printf_parse("\n");
sn.info = PRIMASK;
sn.r.n = sn.a.n = glptr = NULL;
expected_tc = TS_OPERAND | TS_UOPPRE | TC_REGEXP | term_tc;
while (!((tc = next_token(expected_tc)) & term_tc)) {
if (glptr && (t_info == TI_LESS)) {
/* input redirection (<) attached to glptr node */
debug_printf_parse("%s: input redir\n", __func__);
cn = glptr->l.n = new_node(OC_CONCAT | SS | P(37));
cn->a.n = glptr;
expected_tc = TS_OPERAND | TS_UOPPRE;
glptr = NULL;
continue;
}
if (tc & (TS_BINOP | TC_UOPPOST)) {
debug_printf_parse("%s: TS_BINOP | TC_UOPPOST tc:%x\n", __func__, tc);
/* for binary and postfix-unary operators, jump back over
* previous operators with higher priority */
vn = cn;
while (((t_info & PRIMASK) > (vn->a.n->info & PRIMASK2))
|| ((t_info == vn->info) && t_info == TI_COLON)
) {
vn = vn->a.n;
if (!vn->a.n) syntax_error(EMSG_UNEXP_TOKEN);
}
if (t_info == TI_TERNARY)
//TODO: why?
t_info += P(6);
cn = vn->a.n->r.n = new_node(t_info);
cn->a.n = vn->a.n;
if (tc & TS_BINOP) {
cn->l.n = vn;
//FIXME: this is the place to detect and reject assignments to non-lvalues.
//Currently we allow "assignments" to consts and temporaries, nonsense like this:
// awk 'BEGIN { "qwe" = 1 }'
// awk 'BEGIN { 7 *= 7 }'
// awk 'BEGIN { length("qwe") = 1 }'
// awk 'BEGIN { (1+1) += 3 }'
expected_tc = TS_OPERAND | TS_UOPPRE | TC_REGEXP;
if (t_info == TI_PGETLINE) {
/* it's a pipe */
next_token(TC_GETLINE);
/* give maximum priority to this pipe */
cn->info &= ~PRIMASK;
expected_tc = TS_OPERAND | TS_UOPPRE | TS_BINOP | term_tc;
}
} else {
cn->r.n = vn;
expected_tc = TS_OPERAND | TS_UOPPRE | TS_BINOP | term_tc;
}
vn->a.n = cn;
continue;
}
debug_printf_parse("%s: other, t_info:%x\n", __func__, t_info);
/* for operands and prefix-unary operators, attach them
* to last node */
vn = cn;
cn = vn->r.n = new_node(t_info);
cn->a.n = vn;
expected_tc = TS_OPERAND | TS_UOPPRE | TC_REGEXP;
if (t_info == TI_PREINC || t_info == TI_PREDEC)
expected_tc = TS_LVALUE | TC_UOPPRE1;
if (!(tc & (TS_OPERAND | TC_REGEXP)))
continue;
debug_printf_parse("%s: TS_OPERAND | TC_REGEXP\n", __func__);
expected_tc = TS_UOPPRE | TC_UOPPOST | TS_BINOP | TS_OPERAND | term_tc;
/* one should be very careful with switch on tclass -
* only simple tclasses should be used (TC_xyz, not TS_xyz) */
switch (tc) {
case TC_VARIABLE:
case TC_ARRAY:
debug_printf_parse("%s: TC_VARIABLE | TC_ARRAY\n", __func__);
cn->info = OC_VAR;
v = hash_search(ahash, t_string);
if (v != NULL) {
cn->info = OC_FNARG;
cn->l.aidx = v->x.aidx;
} else {
cn->l.v = newvar(t_string);
}
if (tc & TC_ARRAY) {
cn->info |= xS;
cn->r.n = parse_expr(TC_ARRTERM);
}
break;
case TC_NUMBER:
case TC_STRING:
debug_printf_parse("%s: TC_NUMBER | TC_STRING\n", __func__);
cn->info = OC_VAR;
v = cn->l.v = xzalloc(sizeof(var));
if (tc & TC_NUMBER)
setvar_i(v, t_double);
else {
setvar_s(v, t_string);
expected_tc &= ~TC_UOPPOST; /* "str"++ is not allowed */
}
break;
case TC_REGEXP:
debug_printf_parse("%s: TC_REGEXP\n", __func__);
mk_re_node(t_string, cn, xzalloc(sizeof(regex_t)*2));
break;
case TC_FUNCTION:
debug_printf_parse("%s: TC_FUNCTION\n", __func__);
cn->info = OC_FUNC;
cn->r.f = newfunc(t_string);
cn->l.n = parse_expr(TC_RPAREN);
break;
case TC_LPAREN:
debug_printf_parse("%s: TC_LPAREN\n", __func__);
cn = vn->r.n = parse_expr(TC_RPAREN);
if (!cn)
syntax_error("Empty sequence");
cn->a.n = vn;
break;
case TC_GETLINE:
debug_printf_parse("%s: TC_GETLINE\n", __func__);
glptr = cn;
expected_tc = TS_OPERAND | TS_UOPPRE | TS_BINOP | term_tc;
break;
case TC_BUILTIN:
debug_printf_parse("%s: TC_BUILTIN\n", __func__);
cn->l.n = parse_lrparen_list();
break;
case TC_LENGTH:
debug_printf_parse("%s: TC_LENGTH\n", __func__);
tc = next_token(TC_LPAREN /* length(...) */
| TC_SEMICOL /* length; */
| TC_NEWLINE /* length<newline> */
| TC_RBRACE /* length } */
| TC_BINOPX /* length <op> NUM */
| TC_COMMA /* print length, 1 */
);
if (tc != TC_LPAREN)
rollback_token();
else {
/* It was a "(" token. Handle just like TC_BUILTIN */
cn->l.n = parse_expr(TC_RPAREN);
}
break;
}
} /* while() */
debug_printf_parse("%s() returns %p\n", __func__, sn.r.n);
return sn.r.n;
}
/* add node to chain. Return ptr to alloc'd node */
static node *chain_node(uint32_t info)
{
node *n;
if (!seq->first)
seq->first = seq->last = new_node(0);
if (seq->programname != g_progname) {
seq->programname = g_progname;
n = chain_node(OC_NEWSOURCE);
n->l.new_progname = g_progname;
}
n = seq->last;
n->info = info;
seq->last = n->a.n = new_node(OC_DONE);
return n;
}
static void chain_expr(uint32_t info)
{
node *n;
n = chain_node(info);
n->l.n = parse_expr(TC_SEMICOL | TC_NEWLINE | TC_RBRACE);
if ((info & OF_REQUIRED) && !n->l.n)
syntax_error(EMSG_TOO_FEW_ARGS);
if (t_tclass & TC_RBRACE)
rollback_token();
}
static void chain_group(void);
static node *chain_loop(node *nn)
{
node *n, *n2, *save_brk, *save_cont;
save_brk = break_ptr;
save_cont = continue_ptr;
n = chain_node(OC_BR | Vx);
continue_ptr = new_node(OC_EXEC);
break_ptr = new_node(OC_EXEC);
chain_group();
n2 = chain_node(OC_EXEC | Vx);
n2->l.n = nn;
n2->a.n = n;
continue_ptr->a.n = n2;
break_ptr->a.n = n->r.n = seq->last;
continue_ptr = save_cont;
break_ptr = save_brk;
return n;
}
static void chain_until_rbrace(void)
{
uint32_t tc;
while ((tc = next_token(TS_GRPSEQ | TC_RBRACE)) != TC_RBRACE) {
debug_printf_parse("%s: !TC_RBRACE\n", __func__);
if (tc == TC_NEWLINE)
continue;
rollback_token();
chain_group();
}
debug_printf_parse("%s: TC_RBRACE\n", __func__);
}
/* parse group and attach it to chain */
static void chain_group(void)
{
uint32_t tc;
node *n, *n2, *n3;
do {
tc = next_token(TS_GRPSEQ);
} while (tc == TC_NEWLINE);
if (tc == TC_LBRACE) {
debug_printf_parse("%s: TC_LBRACE\n", __func__);
chain_until_rbrace();
return;
}
if (tc & (TS_OPSEQ | TC_SEMICOL)) {
debug_printf_parse("%s: TS_OPSEQ | TC_SEMICOL\n", __func__);
rollback_token();
chain_expr(OC_EXEC | Vx);
return;
}
/* TS_STATEMNT */
debug_printf_parse("%s: TS_STATEMNT(?)\n", __func__);
switch (t_info & OPCLSMASK) {
case ST_IF:
debug_printf_parse("%s: ST_IF\n", __func__);
n = chain_node(OC_BR | Vx);
n->l.n = parse_lrparen_list();
chain_group();
n2 = chain_node(OC_EXEC);
n->r.n = seq->last;
if (next_token(TS_GRPSEQ | TC_RBRACE | TC_ELSE) == TC_ELSE) {
chain_group();
n2->a.n = seq->last;
} else {
rollback_token();
}
break;
case ST_WHILE:
debug_printf_parse("%s: ST_WHILE\n", __func__);
n2 = parse_lrparen_list();
n = chain_loop(NULL);
n->l.n = n2;
break;
case ST_DO:
debug_printf_parse("%s: ST_DO\n", __func__);
n2 = chain_node(OC_EXEC);
n = chain_loop(NULL);
n2->a.n = n->a.n;
next_token(TC_WHILE);
n->l.n = parse_lrparen_list();
break;
case ST_FOR:
debug_printf_parse("%s: ST_FOR\n", __func__);
next_token(TC_LPAREN);
n2 = parse_expr(TC_SEMICOL | TC_RPAREN);
if (t_tclass & TC_RPAREN) { /* for (I in ARRAY) */
if (!n2 || n2->info != TI_IN)
syntax_error(EMSG_UNEXP_TOKEN);
n = chain_node(OC_WALKINIT | VV);
n->l.n = n2->l.n;
n->r.n = n2->r.n;
n = chain_loop(NULL);
n->info = OC_WALKNEXT | Vx;
n->l.n = n2->l.n;
} else { /* for (;;) */
n = chain_node(OC_EXEC | Vx);
n->l.n = n2;
n2 = parse_expr(TC_SEMICOL);
n3 = parse_expr(TC_RPAREN);
n = chain_loop(n3);
n->l.n = n2;
if (!n2)
n->info = OC_EXEC;
}
break;
case OC_PRINT:
case OC_PRINTF:
debug_printf_parse("%s: OC_PRINT[F]\n", __func__);
n = chain_node(t_info);
n->l.n = parse_expr(TC_SEMICOL | TC_NEWLINE | TC_OUTRDR | TC_RBRACE);
if (t_tclass & TC_OUTRDR) {
n->info |= t_info;
n->r.n = parse_expr(TC_SEMICOL | TC_NEWLINE | TC_RBRACE);
}
if (t_tclass & TC_RBRACE)
rollback_token();
break;
case OC_BREAK:
debug_printf_parse("%s: OC_BREAK\n", __func__);
n = chain_node(OC_EXEC);
if (!break_ptr)
syntax_error("'break' not in a loop");
n->a.n = break_ptr;
chain_expr(t_info);
break;
case OC_CONTINUE:
debug_printf_parse("%s: OC_CONTINUE\n", __func__);
n = chain_node(OC_EXEC);
if (!continue_ptr)
syntax_error("'continue' not in a loop");
n->a.n = continue_ptr;
chain_expr(t_info);
break;
/* delete, next, nextfile, return, exit */
default:
debug_printf_parse("%s: default\n", __func__);
chain_expr(t_info);
}
}
static void parse_program(char *p)
{
debug_printf_parse("%s()\n", __func__);
g_pos = p;
t_lineno = 1;
for (;;) {
uint32_t tclass;
tclass = next_token(TS_OPSEQ | TC_LBRACE | TC_BEGIN | TC_END | TC_FUNCDECL
| TC_EOF | TC_NEWLINE /* but not TC_SEMICOL */);
got_tok:
if (tclass == TC_EOF) {
debug_printf_parse("%s: TC_EOF\n", __func__);
break;
}
if (tclass == TC_NEWLINE) {
debug_printf_parse("%s: TC_NEWLINE\n", __func__);
continue;
}
if (tclass == TC_BEGIN) {
debug_printf_parse("%s: TC_BEGIN\n", __func__);
seq = &beginseq;
/* ensure there is no newline between BEGIN and { */
next_token(TC_LBRACE);
chain_until_rbrace();
goto next_tok;
}
if (tclass == TC_END) {
debug_printf_parse("%s: TC_END\n", __func__);
seq = &endseq;
/* ensure there is no newline between END and { */
next_token(TC_LBRACE);
chain_until_rbrace();
goto next_tok;
}
if (tclass == TC_FUNCDECL) {
func *f;
debug_printf_parse("%s: TC_FUNCDECL\n", __func__);
next_token(TC_FUNCTION);
f = newfunc(t_string);
if (f->defined)
syntax_error("Duplicate function");
f->defined = 1;
//f->body.first = NULL; - already is
//f->nargs = 0; - already is
/* func arg list: comma sep list of args, and a close paren */
for (;;) {
var *v;
if (next_token(TC_VARIABLE | TC_RPAREN) == TC_RPAREN) {
if (f->nargs == 0)
break; /* func() is ok */
/* func(a,) is not ok */
syntax_error(EMSG_UNEXP_TOKEN);
}
v = findvar(ahash, t_string);
v->x.aidx = f->nargs++;
/* Arg followed either by end of arg list or 1 comma */
if (next_token(TC_COMMA | TC_RPAREN) == TC_RPAREN)
break;
/* it was a comma, we ate it */
}
seq = &f->body;
/* ensure there is { after "func F(...)" - but newlines are allowed */
while (next_token(TC_LBRACE | TC_NEWLINE) == TC_NEWLINE)
continue;
chain_until_rbrace();
hash_clear(ahash);
goto next_tok;
}
seq = &mainseq;
if (tclass & TS_OPSEQ) {
node *cn;
debug_printf_parse("%s: TS_OPSEQ\n", __func__);
rollback_token();
cn = chain_node(OC_TEST);
cn->l.n = parse_expr(TC_SEMICOL | TC_NEWLINE | TC_EOF | TC_LBRACE);
if (t_tclass == TC_LBRACE) {
debug_printf_parse("%s: TC_LBRACE\n", __func__);
chain_until_rbrace();
} else {
/* no action, assume default "{ print }" */
debug_printf_parse("%s: !TC_LBRACE\n", __func__);
chain_node(OC_PRINT);
}
cn->r.n = mainseq.last;
goto next_tok;
}
/* tclass == TC_LBRACE */
debug_printf_parse("%s: TC_LBRACE(?)\n", __func__);
chain_until_rbrace();
next_tok:
/* Same as next_token() at the top of the loop, + TC_SEMICOL */
tclass = next_token(TS_OPSEQ | TC_LBRACE | TC_BEGIN | TC_END | TC_FUNCDECL
| TC_EOF | TC_NEWLINE | TC_SEMICOL);
/* gawk allows many newlines, but does not allow more than one semicolon:
* BEGIN {...}<newline>;<newline>;
* would complain "each rule must have a pattern or an action part".
* Same message for
* ; BEGIN {...}
*/
if (tclass != TC_SEMICOL)
goto got_tok; /* use this token */
/* else: loop back - ate the semicolon, get and use _next_ token */
} /* for (;;) */
}
/* -------- program execution part -------- */
/* temporary variables allocator */
static var *nvalloc(int sz)
{
return xzalloc(sz * sizeof(var));
}
static void nvfree(var *v, int sz)
{
var *p = v;
while (--sz >= 0) {
if ((p->type & (VF_ARRAY | VF_CHILD)) == VF_ARRAY) {
clear_array(iamarray(p));
free(p->x.array->items);
free(p->x.array);
}
if (p->type & VF_WALK) {
walker_list *n;
walker_list *w = p->x.walker;
debug_printf_walker("nvfree: freeing walker @%p\n", &p->x.walker);
p->x.walker = NULL;
while (w) {
n = w->prev;
debug_printf_walker(" free(%p)\n", w);
free(w);
w = n;
}
}
clrvar(p);
p++;
}
free(v);
}
static node *mk_splitter(const char *s, tsplitter *spl)
{
regex_t *re, *ire;
node *n;
re = &spl->re[0];
ire = &spl->re[1];
n = &spl->n;
if (n->info == TI_REGEXP) {
regfree(re);
regfree(ire); // TODO: nuke ire, use re+1?
}
if (s[0] && s[1]) { /* strlen(s) > 1 */
mk_re_node(s, n, re);
} else {
n->info = (uint32_t) s[0];
}
return n;
}
static var *evaluate(node *, var *);
/* Use node as a regular expression. Supplied with node ptr and regex_t
* storage space. Return ptr to regex (if result points to preg, it should
* be later regfree'd manually).
*/
static regex_t *as_regex(node *op, regex_t *preg)
{
int cflags;
const char *s;
if (op->info == TI_REGEXP) {
return icase ? op->r.ire : op->l.re;
}
//tmpvar = nvalloc(1);
#define TMPVAR (&G.as_regex__tmpvar)
// We use a single "static" tmpvar (instead of on-stack or malloced one)
// to decrease memory consumption in deeply-recursive awk programs.
// The rule to work safely is to never call evaluate() while our static
// TMPVAR's value is still needed.
s = getvar_s(evaluate(op, TMPVAR));
cflags = icase ? REG_EXTENDED | REG_ICASE : REG_EXTENDED;
/* Testcase where REG_EXTENDED fails (unpaired '{'):
* echo Hi | awk 'gsub("@(samp|code|file)\{","");'
* gawk 3.1.5 eats this. We revert to ~REG_EXTENDED
* (maybe gsub is not supposed to use REG_EXTENDED?).
*/
if (regcomp(preg, s, cflags)) {
cflags &= ~REG_EXTENDED;
xregcomp(preg, s, cflags);
}
//nvfree(tmpvar, 1);
#undef TMPVAR
return preg;
}
/* gradually increasing buffer.
* note that we reallocate even if n == old_size,
* and thus there is at least one extra allocated byte.
*/
static char* qrealloc(char *b, int n, int *size)
{
if (!b || n >= *size) {
*size = n + (n>>1) + 80;
b = xrealloc(b, *size);
}
return b;
}
/* resize field storage space */
static void fsrealloc(int size)
{
int i, newsize;
if (size >= maxfields) {
/* Sanity cap, easier than catering for overflows */
if (size > 0xffffff)
bb_die_memory_exhausted();
i = maxfields;
maxfields = size + 16;
newsize = maxfields * sizeof(Fields[0]);
debug_printf_eval("fsrealloc: xrealloc(%p, %u)\n", Fields, newsize);
Fields = xrealloc(Fields, newsize);
debug_printf_eval("fsrealloc: Fields=%p..%p\n", Fields, (char*)Fields + newsize - 1);
/* ^^^ did Fields[] move? debug aid for L.v getting "upstaged" by R.v in evaluate() */
for (; i < maxfields; i++) {
Fields[i].type = VF_SPECIAL;
Fields[i].string = NULL;
}
}
/* if size < nfields, clear extra field variables */
for (i = size; i < nfields; i++) {
clrvar(Fields + i);
}
nfields = size;
}
static int regexec1_nonempty(const regex_t *preg, const char *s, regmatch_t pmatch[])
{
int r = regexec(preg, s, 1, pmatch, 0);
if (r == 0 && pmatch[0].rm_eo == 0) {
/* For example, happens when FS can match
* an empty string (awk -F ' *'). Logically,
* this should split into one-char fields.
* However, gawk 5.0.1 searches for first
* _non-empty_ separator string match:
*/
size_t ofs = 0;
do {
ofs++;
if (!s[ofs])
return REG_NOMATCH;
regexec(preg, s + ofs, 1, pmatch, 0);
} while (pmatch[0].rm_eo == 0);
pmatch[0].rm_so += ofs;
pmatch[0].rm_eo += ofs;
}
return r;
}
static int awk_split(const char *s, node *spl, char **slist)
{
int n;
char c[4];
char *s1;
/* in worst case, each char would be a separate field */
*slist = s1 = xzalloc(strlen(s) * 2 + 3);
strcpy(s1, s);
c[0] = c[1] = (char)spl->info;
c[2] = c[3] = '\0';
if (*getvar_s(intvar[RS]) == '\0')
c[2] = '\n';
n = 0;
if (spl->info == TI_REGEXP) { /* regex split */
if (!*s)
return n; /* "": zero fields */
n++; /* at least one field will be there */
do {
int l;
regmatch_t pmatch[1];
l = strcspn(s, c+2); /* len till next NUL or \n */
if (regexec1_nonempty(icase ? spl->r.ire : spl->l.re, s, pmatch) == 0
&& pmatch[0].rm_so <= l
) {
/* if (pmatch[0].rm_eo == 0) ... - impossible */
l = pmatch[0].rm_so;
n++; /* we saw yet another delimiter */
} else {
pmatch[0].rm_eo = l;
if (s[l])
pmatch[0].rm_eo++;
}
s1 = mempcpy(s1, s, l);
*s1++ = '\0';
s += pmatch[0].rm_eo;
} while (*s);
/* echo a-- | awk -F-- '{ print NF, length($NF), $NF }'
* should print "2 0 ":
*/
*s1 = '\0';
return n;
}
if (c[0] == '\0') { /* null split */
while (*s) {
*s1++ = *s++;
*s1++ = '\0';
n++;
}
return n;
}
if (c[0] != ' ') { /* single-character split */
if (icase) {
c[0] = toupper(c[0]);
c[1] = tolower(c[1]);
}
if (*s1)
n++;
while ((s1 = strpbrk(s1, c)) != NULL) {
*s1++ = '\0';
n++;
}
return n;
}
/* space split */
while (*s) {
s = skip_whitespace(s);
if (!*s)
break;
n++;
while (*s && !isspace(*s))
*s1++ = *s++;
*s1++ = '\0';
}
return n;
}
static void split_f0(void)
{
/* static char *fstrings; */
#define fstrings (G.split_f0__fstrings)
int i, n;
char *s;
if (is_f0_split)
return;
is_f0_split = TRUE;
free(fstrings);
fsrealloc(0);
n = awk_split(getvar_s(intvar[F0]), &fsplitter.n, &fstrings);
fsrealloc(n);
s = fstrings;
for (i = 0; i < n; i++) {
Fields[i].string = nextword(&s);
Fields[i].type |= (VF_FSTR | VF_USER | VF_DIRTY);
}
/* set NF manually to avoid side effects */
clrvar(intvar[NF]);
intvar[NF]->type = VF_NUMBER | VF_SPECIAL;
intvar[NF]->number = nfields;
#undef fstrings
}
/* perform additional actions when some internal variables changed */
static void handle_special(var *v)
{
int n;
char *b;
const char *sep, *s;
int sl, l, len, i, bsize;
if (!(v->type & VF_SPECIAL))
return;
if (v == intvar[NF]) {
n = (int)getvar_i(v);
if (n < 0)
syntax_error("NF set to negative value");
fsrealloc(n);
/* recalculate $0 */
sep = getvar_s(intvar[OFS]);
sl = strlen(sep);
b = NULL;
len = 0;
for (i = 0; i < n; i++) {
s = getvar_s(&Fields[i]);
l = strlen(s);
if (b) {
memcpy(b+len, sep, sl);
len += sl;
}
b = qrealloc(b, len+l+sl, &bsize);
memcpy(b+len, s, l);
len += l;
}
if (b)
b[len] = '\0';
setvar_p(intvar[F0], b);
is_f0_split = TRUE;
} else if (v == intvar[F0]) {
is_f0_split = FALSE;
} else if (v == intvar[FS]) {
/*
* The POSIX-2008 standard says that changing FS should have no effect on the
* current input line, but only on the next one. The language is:
*
* > Before the first reference to a field in the record is evaluated, the record
* > shall be split into fields, according to the rules in Regular Expressions,
* > using the value of FS that was current at the time the record was read.
*
* So, split up current line before assignment to FS:
*/
split_f0();
mk_splitter(getvar_s(v), &fsplitter);
} else if (v == intvar[RS]) {
mk_splitter(getvar_s(v), &rsplitter);
} else if (v == intvar[IGNORECASE]) {
icase = istrue(v);
} else { /* $n */
n = getvar_i(intvar[NF]);
setvar_i(intvar[NF], n > v-Fields ? n : v-Fields+1);
/* right here v is invalid. Just to note... */
}
}
/* step through func/builtin/etc arguments */
static node *nextarg(node **pn)
{
node *n;
n = *pn;
if (n && n->info == TI_COMMA) {
*pn = n->r.n;
n = n->l.n;
} else {
*pn = NULL;
}
return n;
}
static void hashwalk_init(var *v, xhash *array)
{
hash_item *hi;
unsigned i;
walker_list *w;
walker_list *prev_walker;
if (v->type & VF_WALK) {
prev_walker = v->x.walker;
} else {
v->type |= VF_WALK;
prev_walker = NULL;
}
debug_printf_walker("hashwalk_init: prev_walker:%p\n", prev_walker);
w = v->x.walker = xzalloc(sizeof(*w) + array->glen + 1); /* why + 1? */
debug_printf_walker(" walker@%p=%p\n", &v->x.walker, w);
w->cur = w->end = w->wbuf;
w->prev = prev_walker;
for (i = 0; i < array->csize; i++) {
hi = array->items[i];
while (hi) {
w->end = stpcpy(w->end, hi->name) + 1;
hi = hi->next;
}
}
}
static int hashwalk_next(var *v)
{
walker_list *w = v->x.walker;
if (w->cur >= w->end) {
walker_list *prev_walker = w->prev;
debug_printf_walker("end of iteration, free(walker@%p:%p), prev_walker:%p\n", &v->x.walker, w, prev_walker);
free(w);
v->x.walker = prev_walker;
return FALSE;
}
setvar_s(v, nextword(&w->cur));
return TRUE;
}
/* evaluate node, return 1 when result is true, 0 otherwise */
static int ptest(node *pattern)
{
// We use a single "static" tmpvar (instead of on-stack or malloced one)
// to decrease memory consumption in deeply-recursive awk programs.
// The rule to work safely is to never call evaluate() while our static
// TMPVAR's value is still needed.
return istrue(evaluate(pattern, &G.ptest__tmpvar));
}
/* read next record from stream rsm into a variable v */
static int awk_getline(rstream *rsm, var *v)
{
char *b;
regmatch_t pmatch[1];
int size, a, p, pp = 0;
int fd, so, eo, r, rp;
char c, *m, *s;
debug_printf_eval("entered %s()\n", __func__);
/* we're using our own buffer since we need access to accumulating
* characters
*/
fd = fileno(rsm->F);
m = rsm->buffer;
a = rsm->adv;
p = rsm->pos;
size = rsm->size;
c = (char) rsplitter.n.info;
rp = 0;
if (!m)
m = qrealloc(m, 256, &size);
do {
b = m + a;
so = eo = p;
r = 1;
if (p > 0) {
if (rsplitter.n.info == TI_REGEXP) {
if (regexec(icase ? rsplitter.n.r.ire : rsplitter.n.l.re,
b, 1, pmatch, 0) == 0) {
so = pmatch[0].rm_so;
eo = pmatch[0].rm_eo;
if (b[eo] != '\0')
break;
}
} else if (c != '\0') {
s = strchr(b+pp, c);
if (!s)
s = memchr(b+pp, '\0', p - pp);
if (s) {
so = eo = s-b;
eo++;
break;
}
} else {
while (b[rp] == '\n')
rp++;
s = strstr(b+rp, "\n\n");
if (s) {
so = eo = s-b;
while (b[eo] == '\n')
eo++;
if (b[eo] != '\0')
break;
}
}
}
if (a > 0) {
memmove(m, m+a, p+1);
b = m;
a = 0;
}
m = qrealloc(m, a+p+128, &size);
b = m + a;
pp = p;
p += safe_read(fd, b+p, size-p-1);
if (p < pp) {
p = 0;
r = 0;
setvar_i(intvar[ERRNO], errno);
}
b[p] = '\0';
} while (p > pp);
if (p == 0) {
r--;
} else {
c = b[so]; b[so] = '\0';
setvar_s(v, b+rp);
v->type |= VF_USER;
b[so] = c;
c = b[eo]; b[eo] = '\0';
setvar_s(intvar[RT], b+so);
b[eo] = c;
}
rsm->buffer = m;
rsm->adv = a + eo;
rsm->pos = p - eo;
rsm->size = size;
debug_printf_eval("returning from %s(): %d\n", __func__, r);
return r;
}
/* formatted output into an allocated buffer, return ptr to buffer */
#if !ENABLE_FEATURE_AWK_GNU_EXTENSIONS
# define awk_printf(a, b) awk_printf(a)
#endif
static char *awk_printf(node *n, size_t *len)
{
char *b;
char *fmt, *f;
size_t i;
//tmpvar = nvalloc(1);
#define TMPVAR (&G.awk_printf__tmpvar)
// We use a single "static" tmpvar (instead of on-stack or malloced one)
// to decrease memory consumption in deeply-recursive awk programs.
// The rule to work safely is to never call evaluate() while our static
// TMPVAR's value is still needed.
fmt = f = xstrdup(getvar_s(evaluate(nextarg(&n), TMPVAR)));
// ^^^^^^^^^ here we immediately strdup() the value, so the later call
// to evaluate() potentially recursing into another awk_printf() can't
// mangle the value.
b = NULL;
i = 0;
while (1) { /* "print one format spec" loop */
char *s;
char c;
char sv;
var *arg;
size_t slen;
/* Find end of the next format spec, or end of line */
s = f;
while (1) {
c = *f;
if (!c) /* no percent chars found at all */
goto nul;
f++;
if (c == '%')
break;
}
/* we are past % in "....%..." */
c = *f;
if (!c) /* "....%" */
goto nul;
if (c == '%') { /* "....%%...." */
slen = f - s;
s = xstrndup(s, slen);
f++;
goto append; /* print "....%" part verbatim */
}
while (1) {
if (isalpha(c))
break;
if (c == '*')
syntax_error("%*x formats are not supported");
c = *++f;
if (!c) { /* "....%...." and no letter found after % */
/* Example: awk 'BEGIN { printf "^^^%^^^\n"; }' */
nul:
slen = f - s;
goto tail; /* print remaining string, exit loop */
}
}
/* we are at A in "....%...A..." */
arg = evaluate(nextarg(&n), TMPVAR);
/* Result can be arbitrarily long. Example:
* printf "%99999s", "BOOM"
*/
sv = *++f;
*f = '\0';
if (c == 'c') {
char cc = is_numeric(arg) ? getvar_i(arg) : *getvar_s(arg);
char *r = xasprintf(s, cc ? cc : '^' /* else strlen will be wrong */);
slen = strlen(r);
if (cc == '\0') /* if cc is NUL, re-format the string with it */
sprintf(r, s, cc);
s = r;
} else {
if (c == 's') {
s = xasprintf(s, getvar_s(arg));
} else {
double d = getvar_i(arg);
if (strchr("diouxX", c)) {
//TODO: make it wider here (%x -> %llx etc)?
s = xasprintf(s, (int)d);
} else if (strchr("eEfFgGaA", c)) {
s = xasprintf(s, d);
} else {
//TODO: GNU Awk 5.0.1: printf "%W" prints "%W", does not error out
syntax_error(EMSG_INV_FMT);
}
}
slen = strlen(s);
}
*f = sv;
append:
if (i == 0) {
b = s;
i = slen;
continue;
}
tail:
b = xrealloc(b, i + slen + 1);
strcpy(b + i, s);
i += slen;
if (!c) /* s is NOT allocated and this is the last part of string? */
break;
free(s);
}
free(fmt);
//nvfree(tmpvar, 1);
#undef TMPVAR
#if ENABLE_FEATURE_AWK_GNU_EXTENSIONS
if (len)
*len = i;
#endif
return b;
}
/* Common substitution routine.
* Replace (nm)'th substring of (src) that matches (rn) with (repl),
* store result into (dest), return number of substitutions.
* If nm = 0, replace all matches.
* If src or dst is NULL, use $0.
* If subexp != 0, enable subexpression matching (\1-\9).
*/
static int awk_sub(node *rn, const char *repl, int nm, var *src, var *dest, int subexp)
{
char *resbuf;
const char *sp;
int match_no, residx, replen, resbufsize;
int regexec_flags;
regmatch_t pmatch[10];
regex_t sreg, *regex;
resbuf = NULL;
residx = 0;
match_no = 0;
regexec_flags = 0;
regex = as_regex(rn, &sreg);
sp = getvar_s(src ? src : intvar[F0]);
replen = strlen(repl);
while (regexec(regex, sp, 10, pmatch, regexec_flags) == 0) {
int so = pmatch[0].rm_so;
int eo = pmatch[0].rm_eo;
//bb_error_msg("match %u: [%u,%u] '%s'%p", match_no+1, so, eo, sp,sp);
resbuf = qrealloc(resbuf, residx + eo + replen, &resbufsize);
memcpy(resbuf + residx, sp, eo);
residx += eo;
if (++match_no >= nm) {
const char *s;
int nbs;
/* replace */
residx -= (eo - so);
nbs = 0;
for (s = repl; *s; s++) {
char c = resbuf[residx++] = *s;
if (c == '\\') {
nbs++;
continue;
}
if (c == '&' || (subexp && c >= '0' && c <= '9')) {
int j;
residx -= ((nbs + 3) >> 1);
j = 0;
if (c != '&') {
j = c - '0';
nbs++;
}
if (nbs % 2) {
resbuf[residx++] = c;
} else {
int n = pmatch[j].rm_eo - pmatch[j].rm_so;
resbuf = qrealloc(resbuf, residx + replen + n, &resbufsize);
memcpy(resbuf + residx, sp + pmatch[j].rm_so, n);
residx += n;
}
}
nbs = 0;
}
}
regexec_flags = REG_NOTBOL;
sp += eo;
if (match_no == nm)
break;
if (eo == so) {
/* Empty match (e.g. "b*" will match anywhere).
* Advance by one char. */
//BUG (bug 1333):
//gsub(/\<b*/,"") on "abc" will reach this point, advance to "bc"
//... and will erroneously match "b" even though it is NOT at the word start.
//we need REG_NOTBOW but it does not exist...
//TODO: if EXTRA_COMPAT=y, use GNU matching and re_search,
//it should be able to do it correctly.
/* Subtle: this is safe only because
* qrealloc allocated at least one extra byte */
resbuf[residx] = *sp;
if (*sp == '\0')
goto ret;
sp++;
residx++;
}
}
resbuf = qrealloc(resbuf, residx + strlen(sp), &resbufsize);
strcpy(resbuf + residx, sp);
ret:
//bb_error_msg("end sp:'%s'%p", sp,sp);
setvar_p(dest ? dest : intvar[F0], resbuf);
if (regex == &sreg)
regfree(regex);
return match_no;
}
static NOINLINE int do_mktime(const char *ds)
{
struct tm then;
int count;
/*memset(&then, 0, sizeof(then)); - not needed */
then.tm_isdst = -1; /* default is unknown */
/* manpage of mktime says these fields are ints,
* so we can sscanf stuff directly into them */
count = sscanf(ds, "%u %u %u %u %u %u %d",
&then.tm_year, &then.tm_mon, &then.tm_mday,
&then.tm_hour, &then.tm_min, &then.tm_sec,
&then.tm_isdst);
if (count < 6
|| (unsigned)then.tm_mon < 1
|| (unsigned)then.tm_year < 1900
) {
return -1;
}
then.tm_mon -= 1;
then.tm_year -= 1900;
return mktime(&then);
}
/* Reduce stack usage in exec_builtin() by keeping match() code separate */
static NOINLINE var *do_match(node *an1, const char *as0)
{
regmatch_t pmatch[1];
regex_t sreg, *re;
int n, start, len;
re = as_regex(an1, &sreg);
n = regexec(re, as0, 1, pmatch, 0);
if (re == &sreg)
regfree(re);
start = 0;
len = -1;
if (n == 0) {
start = pmatch[0].rm_so + 1;
len = pmatch[0].rm_eo - pmatch[0].rm_so;
}
setvar_i(newvar("RLENGTH"), len);
return setvar_i(newvar("RSTART"), start);
}
/* Reduce stack usage in evaluate() by keeping builtins' code separate */
static NOINLINE var *exec_builtin(node *op, var *res)
{
#define tspl (G.exec_builtin__tspl)
var *tmpvars;
node *an[4];
var *av[4];
const char *as[4];
node *spl;
uint32_t isr, info;
int nargs;
time_t tt;
int i, l, ll, n;
tmpvars = nvalloc(4);
#define TMPVAR0 (tmpvars)
#define TMPVAR1 (tmpvars + 1)
#define TMPVAR2 (tmpvars + 2)
#define TMPVAR3 (tmpvars + 3)
#define TMPVAR(i) (tmpvars + (i))
isr = info = op->info;
op = op->l.n;
av[2] = av[3] = NULL;
for (i = 0; i < 4 && op; i++) {
an[i] = nextarg(&op);
if (isr & 0x09000000) {
av[i] = evaluate(an[i], TMPVAR(i));
if (isr & 0x08000000)
as[i] = getvar_s(av[i]);
}
isr >>= 1;
}
nargs = i;
if ((uint32_t)nargs < (info >> 30))
syntax_error(EMSG_TOO_FEW_ARGS);
info &= OPNMASK;
switch (info) {
case B_a2:
if (ENABLE_FEATURE_AWK_LIBM)
setvar_i(res, atan2(getvar_i(av[0]), getvar_i(av[1])));
else
syntax_error(EMSG_NO_MATH);
break;
case B_sp: {
char *s, *s1;
if (nargs > 2) {
spl = (an[2]->info == TI_REGEXP) ? an[2]
: mk_splitter(getvar_s(evaluate(an[2], TMPVAR2)), &tspl);
} else {
spl = &fsplitter.n;
}
n = awk_split(as[0], spl, &s);
s1 = s;
clear_array(iamarray(av[1]));
for (i = 1; i <= n; i++)
setari_u(av[1], i, nextword(&s));
free(s1);
setvar_i(res, n);
break;
}
case B_ss: {
char *s;
l = strlen(as[0]);
i = getvar_i(av[1]) - 1;
if (i > l)
i = l;
if (i < 0)
i = 0;
n = (nargs > 2) ? getvar_i(av[2]) : l-i;
if (n < 0)
n = 0;
s = xstrndup(as[0]+i, n);
setvar_p(res, s);
break;
}
/* Bitwise ops must assume that operands are unsigned. GNU Awk 3.1.5:
* awk '{ print or(-1,1) }' gives "4.29497e+09", not "-2.xxxe+09" */
case B_an:
setvar_i(res, getvar_i_int(av[0]) & getvar_i_int(av[1]));
break;
case B_co:
setvar_i(res, ~getvar_i_int(av[0]));
break;
case B_ls:
setvar_i(res, getvar_i_int(av[0]) << getvar_i_int(av[1]));
break;
case B_or:
setvar_i(res, getvar_i_int(av[0]) | getvar_i_int(av[1]));
break;
case B_rs:
setvar_i(res, getvar_i_int(av[0]) >> getvar_i_int(av[1]));
break;
case B_xo:
setvar_i(res, getvar_i_int(av[0]) ^ getvar_i_int(av[1]));
break;
case B_lo:
case B_up: {
char *s, *s1;
s1 = s = xstrdup(as[0]);
while (*s1) {
//*s1 = (info == B_up) ? toupper(*s1) : tolower(*s1);
if ((unsigned char)((*s1 | 0x20) - 'a') <= ('z' - 'a'))
*s1 = (info == B_up) ? (*s1 & 0xdf) : (*s1 | 0x20);
s1++;
}
setvar_p(res, s);
break;
}
case B_ix:
n = 0;
ll = strlen(as[1]);
l = strlen(as[0]) - ll;
if (ll > 0 && l >= 0) {
if (!icase) {
char *s = strstr(as[0], as[1]);
if (s)
n = (s - as[0]) + 1;
} else {
/* this piece of code is terribly slow and
* really should be rewritten
*/
for (i = 0; i <= l; i++) {
if (strncasecmp(as[0]+i, as[1], ll) == 0) {
n = i+1;
break;
}
}
}
}
setvar_i(res, n);
break;
case B_ti:
if (nargs > 1)
tt = getvar_i(av[1]);
else
time(&tt);
//s = (nargs > 0) ? as[0] : "%a %b %d %H:%M:%S %Z %Y";
i = strftime(g_buf, MAXVARFMT,
((nargs > 0) ? as[0] : "%a %b %d %H:%M:%S %Z %Y"),
localtime(&tt));
g_buf[i] = '\0';
setvar_s(res, g_buf);
break;
case B_mt:
setvar_i(res, do_mktime(as[0]));
break;
case B_ma:
res = do_match(an[1], as[0]);
break;
case B_ge:
awk_sub(an[0], as[1], getvar_i(av[2]), av[3], res, TRUE);
break;
case B_gs:
setvar_i(res, awk_sub(an[0], as[1], 0, av[2], av[2], FALSE));
break;
case B_su:
setvar_i(res, awk_sub(an[0], as[1], 1, av[2], av[2], FALSE));
break;
}
nvfree(tmpvars, 4);
#undef TMPVAR0
#undef TMPVAR1
#undef TMPVAR2
#undef TMPVAR3
#undef TMPVAR
return res;
#undef tspl
}
/* if expr looks like "var=value", perform assignment and return 1,
* otherwise return 0 */
static int is_assignment(const char *expr)
{
char *exprc, *val;
val = (char*)endofname(expr);
if (val == (char*)expr || *val != '=') {
return FALSE;
}
exprc = xstrdup(expr);
val = exprc + (val - expr);
*val++ = '\0';
unescape_string_in_place(val);
setvar_u(newvar(exprc), val);
free(exprc);
return TRUE;
}
/* switch to next input file */
static rstream *next_input_file(void)
{
#define rsm (G.next_input_file__rsm)
#define files_happen (G.next_input_file__files_happen)
const char *fname, *ind;
if (rsm.F)
fclose(rsm.F);
rsm.F = NULL;
rsm.pos = rsm.adv = 0;
for (;;) {
if (getvar_i(intvar[ARGIND])+1 >= getvar_i(intvar[ARGC])) {
if (files_happen)
return NULL;
fname = "-";
rsm.F = stdin;
break;
}
ind = getvar_s(incvar(intvar[ARGIND]));
fname = getvar_s(findvar(iamarray(intvar[ARGV]), ind));
if (fname && *fname && !is_assignment(fname)) {
rsm.F = xfopen_stdin(fname);
break;
}
}
files_happen = TRUE;
setvar_s(intvar[FILENAME], fname);
return &rsm;
#undef rsm
#undef files_happen
}
/*
* Evaluate node - the heart of the program. Supplied with subtree
* and "res" variable to assign the result to if we evaluate an expression.
* If node refers to e.g. a variable or a field, no assignment happens.
* Return ptr to the result (which may or may not be the "res" variable!)
*/
#define XC(n) ((n) >> 8)
static var *evaluate(node *op, var *res)
{
/* This procedure is recursive so we should count every byte */
#define fnargs (G.evaluate__fnargs)
/* seed is initialized to 1 */
#define seed (G.evaluate__seed)
#define sreg (G.evaluate__sreg)
var *tmpvars;
if (!op)
return setvar_s(res, NULL);
debug_printf_eval("entered %s()\n", __func__);
tmpvars = nvalloc(2);
#define TMPVAR0 (tmpvars)
#define TMPVAR1 (tmpvars + 1)
while (op) {
struct {
var *v;
const char *s;
} L = L; /* for compiler */
struct {
var *v;
const char *s;
} R = R;
double L_d = L_d;
uint32_t opinfo;
int opn;
node *op1;
opinfo = op->info;
opn = (opinfo & OPNMASK);
g_lineno = op->lineno;
op1 = op->l.n;
debug_printf_eval("opinfo:%08x opn:%08x\n", opinfo, opn);
/* execute inevitable things */
if (opinfo & OF_RES1) {
if ((opinfo & OF_REQUIRED) && !op1)
syntax_error(EMSG_TOO_FEW_ARGS);
L.v = evaluate(op1, TMPVAR0);
if (opinfo & OF_STR1) {
L.s = getvar_s(L.v);
debug_printf_eval("L.s:'%s'\n", L.s);
}
if (opinfo & OF_NUM1) {
L_d = getvar_i(L.v);
debug_printf_eval("L_d:%f\n", L_d);
}
}
/* NB: Must get string/numeric values of L (done above)
* _before_ evaluate()'ing R.v: if both L and R are $NNNs,
* and right one is large, then L.v points to Fields[NNN1],
* second evaluate() reallocates and moves (!) Fields[],
* R.v points to Fields[NNN2] but L.v now points to freed mem!
* (Seen trying to evaluate "$444 $44444")
*/
if (opinfo & OF_RES2) {
R.v = evaluate(op->r.n, TMPVAR1);
//TODO: L.v may be invalid now, set L.v to NULL to catch bugs?
//L.v = NULL;
if (opinfo & OF_STR2) {
R.s = getvar_s(R.v);
debug_printf_eval("R.s:'%s'\n", R.s);
}
}
debug_printf_eval("switch(0x%x)\n", XC(opinfo & OPCLSMASK));
switch (XC(opinfo & OPCLSMASK)) {
/* -- iterative node type -- */
/* test pattern */
case XC( OC_TEST ):
debug_printf_eval("TEST\n");
if (op1->info == TI_COMMA) {
/* it's range pattern */
if ((opinfo & OF_CHECKED) || ptest(op1->l.n)) {
op->info |= OF_CHECKED;
if (ptest(op1->r.n))
op->info &= ~OF_CHECKED;
op = op->a.n;
} else {
op = op->r.n;
}
} else {
op = ptest(op1) ? op->a.n : op->r.n;
}
break;
/* just evaluate an expression, also used as unconditional jump */
case XC( OC_EXEC ):
debug_printf_eval("EXEC\n");
break;
/* branch, used in if-else and various loops */
case XC( OC_BR ):
debug_printf_eval("BR\n");
op = istrue(L.v) ? op->a.n : op->r.n;
break;
/* initialize for-in loop */
case XC( OC_WALKINIT ):
debug_printf_eval("WALKINIT\n");
hashwalk_init(L.v, iamarray(R.v));
break;
/* get next array item */
case XC( OC_WALKNEXT ):
debug_printf_eval("WALKNEXT\n");
op = hashwalk_next(L.v) ? op->a.n : op->r.n;
break;
case XC( OC_PRINT ):
debug_printf_eval("PRINT /\n");
case XC( OC_PRINTF ):
debug_printf_eval("PRINTF\n");
{
FILE *F = stdout;
if (op->r.n) {
rstream *rsm = newfile(R.s);
if (!rsm->F) {
if (opn == '|') {
rsm->F = popen(R.s, "w");
if (rsm->F == NULL)
bb_simple_perror_msg_and_die("popen");
rsm->is_pipe = 1;
} else {
rsm->F = xfopen(R.s, opn=='w' ? "w" : "a");
}
}
F = rsm->F;
}
/* Can't just check 'opinfo == OC_PRINT' here, parser ORs
* additional bits to opinfos of print/printf with redirects
*/
if ((opinfo & OPCLSMASK) == OC_PRINT) {
if (!op1) {
fputs(getvar_s(intvar[F0]), F);
} else {
for (;;) {
var *v = evaluate(nextarg(&op1), TMPVAR0);
if (v->type & VF_NUMBER) {
fmt_num(getvar_s(intvar[OFMT]),
getvar_i(v));
fputs(g_buf, F);
} else {
fputs(getvar_s(v), F);
}
if (!op1)
break;
fputs(getvar_s(intvar[OFS]), F);
}
}
fputs(getvar_s(intvar[ORS]), F);
} else { /* PRINTF */
IF_FEATURE_AWK_GNU_EXTENSIONS(size_t len;)
char *s = awk_printf(op1, &len);
#if ENABLE_FEATURE_AWK_GNU_EXTENSIONS
fwrite(s, len, 1, F);
#else
fputs(s, F);
#endif
free(s);
}
fflush(F);
break;
}
case XC( OC_DELETE ):
debug_printf_eval("DELETE\n");
{
/* "delete" is special:
* "delete array[var--]" must evaluate index expr only once.
*/
uint32_t info = op1->info & OPCLSMASK;
var *v;
if (info == OC_VAR) {
v = op1->l.v;
} else if (info == OC_FNARG) {
v = &fnargs[op1->l.aidx];
} else {
syntax_error(EMSG_NOT_ARRAY);
}
if (op1->r.n) { /* array ref? */
const char *s;
s = getvar_s(evaluate(op1->r.n, TMPVAR0));
hash_remove(iamarray(v), s);
} else {
clear_array(iamarray(v));
}
break;
}
case XC( OC_NEWSOURCE ):
debug_printf_eval("NEWSOURCE\n");
g_progname = op->l.new_progname;
break;
case XC( OC_RETURN ):
debug_printf_eval("RETURN\n");
copyvar(res, L.v);
break;
case XC( OC_NEXTFILE ):
debug_printf_eval("NEXTFILE\n");
nextfile = TRUE;
case XC( OC_NEXT ):
debug_printf_eval("NEXT\n");
nextrec = TRUE;
case XC( OC_DONE ):
debug_printf_eval("DONE\n");
clrvar(res);
break;
case XC( OC_EXIT ):
debug_printf_eval("EXIT\n");
if (op1)
G.exitcode = (int)L_d;
awk_exit();
/* -- recursive node type -- */
case XC( OC_VAR ):
debug_printf_eval("VAR\n");
L.v = op->l.v;
if (L.v == intvar[NF])
split_f0();
goto v_cont;
case XC( OC_FNARG ):
debug_printf_eval("FNARG[%d]\n", op->l.aidx);
L.v = &fnargs[op->l.aidx];
v_cont:
res = op->r.n ? findvar(iamarray(L.v), R.s) : L.v;
break;
case XC( OC_IN ):
debug_printf_eval("IN\n");
setvar_i(res, hash_search(iamarray(R.v), L.s) ? 1 : 0);
break;
case XC( OC_REGEXP ):
debug_printf_eval("REGEXP\n");
op1 = op;
L.s = getvar_s(intvar[F0]);
goto re_cont;
case XC( OC_MATCH ):
debug_printf_eval("MATCH\n");
op1 = op->r.n;
re_cont:
{
regex_t *re = as_regex(op1, &sreg);
int i = regexec(re, L.s, 0, NULL, 0);
if (re == &sreg)
regfree(re);
setvar_i(res, (i == 0) ^ (opn == '!'));
}
break;
case XC( OC_MOVE ):
debug_printf_eval("MOVE\n");
/* if source is a temporary string, jusk relink it to dest */
if (R.v == TMPVAR1
&& !(R.v->type & VF_NUMBER)
/* Why check !NUMBER? if R.v is a number but has cached R.v->string,
* L.v ends up a string, which is wrong */
/*&& R.v->string - always not NULL (right?) */
) {
res = setvar_p(L.v, R.v->string); /* avoids strdup */
R.v->string = NULL;
} else {
res = copyvar(L.v, R.v);
}
break;
case XC( OC_TERNARY ):
debug_printf_eval("TERNARY\n");
if (op->r.n->info != TI_COLON)
syntax_error(EMSG_POSSIBLE_ERROR);
res = evaluate(istrue(L.v) ? op->r.n->l.n : op->r.n->r.n, res);
break;
case XC( OC_FUNC ): {
var *argvars, *sv_fnargs;
const char *sv_progname;
int nargs, i;
debug_printf_eval("FUNC\n");
if (!op->r.f->defined)
syntax_error(EMSG_UNDEF_FUNC);
/* The body might be empty, still has to eval the args */
nargs = op->r.f->nargs;
argvars = nvalloc(nargs);
i = 0;
while (op1) {
var *arg = evaluate(nextarg(&op1), TMPVAR0);
if (i == nargs) {
/* call with more arguments than function takes.
* (gawk warns: "warning: function 'f' called with more arguments than declared").
* They are still evaluated, but discarded: */
clrvar(arg);
continue;
}
copyvar(&argvars[i], arg);
argvars[i].type |= VF_CHILD;
argvars[i].x.parent = arg;
i++;
}
sv_fnargs = fnargs;
sv_progname = g_progname;
fnargs = argvars;
res = evaluate(op->r.f->body.first, res);
nvfree(argvars, nargs);
g_progname = sv_progname;
fnargs = sv_fnargs;
break;
}
case XC( OC_GETLINE ):
debug_printf_eval("GETLINE /\n");
case XC( OC_PGETLINE ):
debug_printf_eval("PGETLINE\n");
{
rstream *rsm;
int i;
if (op1) {
rsm = newfile(L.s);
if (!rsm->F) {
/* NB: can't use "opinfo == TI_PGETLINE", would break "cmd" | getline */
if ((opinfo & OPCLSMASK) == OC_PGETLINE) {
rsm->F = popen(L.s, "r");
rsm->is_pipe = TRUE;
} else {
rsm->F = fopen_for_read(L.s); /* not xfopen! */
}
}
} else {
if (!iF)
iF = next_input_file();
rsm = iF;
}
if (!rsm || !rsm->F) {
setvar_i(intvar[ERRNO], errno);
setvar_i(res, -1);
break;
}
if (!op->r.n)
R.v = intvar[F0];
i = awk_getline(rsm, R.v);
if (i > 0 && !op1) {
incvar(intvar[FNR]);
incvar(intvar[NR]);
}
setvar_i(res, i);
break;
}
/* simple builtins */
case XC( OC_FBLTIN ): {
double R_d = R_d; /* for compiler */
debug_printf_eval("FBLTIN\n");
if (op1 && op1->info == TI_COMMA)
/* Simple builtins take one arg maximum */
syntax_error("Too many arguments");
switch (opn) {
case F_in:
R_d = (long long)L_d;
break;
case F_rn: /*rand*/
if (op1)
syntax_error("Too many arguments");
{
#if RAND_MAX >= 0x7fffffff
uint32_t u = ((uint32_t)rand() << 16) ^ rand();
uint64_t v = ((uint64_t)rand() << 32) | u;
/* the above shift+or is optimized out on 32-bit arches */
# if RAND_MAX > 0x7fffffff
v &= 0x7fffffffffffffffULL;
# endif
R_d = (double)v / 0x8000000000000000ULL;
#else
# error Not implemented for this value of RAND_MAX
#endif
break;
}
case F_co:
if (ENABLE_FEATURE_AWK_LIBM) {
R_d = cos(L_d);
break;
}
case F_ex:
if (ENABLE_FEATURE_AWK_LIBM) {
R_d = exp(L_d);
break;
}
case F_lg:
if (ENABLE_FEATURE_AWK_LIBM) {
R_d = log(L_d);
break;
}
case F_si:
if (ENABLE_FEATURE_AWK_LIBM) {
R_d = sin(L_d);
break;
}
case F_sq:
if (ENABLE_FEATURE_AWK_LIBM) {
R_d = sqrt(L_d);
break;
}
syntax_error(EMSG_NO_MATH);
break;
case F_sr:
R_d = (double)seed;
seed = op1 ? (unsigned)L_d : (unsigned)time(NULL);
srand(seed);
break;
case F_ti: /*systime*/
if (op1)
syntax_error("Too many arguments");
R_d = time(NULL);
break;
case F_le:
debug_printf_eval("length: L.s:'%s'\n", L.s);
if (!op1) {
L.s = getvar_s(intvar[F0]);
debug_printf_eval("length: L.s='%s'\n", L.s);
}
else if (L.v->type & VF_ARRAY) {
R_d = L.v->x.array->nel;
debug_printf_eval("length: array_len:%d\n", L.v->x.array->nel);
break;
}
R_d = strlen(L.s);
break;
case F_sy:
fflush_all();
R_d = (ENABLE_FEATURE_ALLOW_EXEC && L.s && *L.s)
? (system(L.s) >> 8) : 0;
break;
case F_ff:
if (!op1) {
fflush(stdout);
} else if (L.s && *L.s) {
rstream *rsm = newfile(L.s);
fflush(rsm->F);
} else {
fflush_all();
}
break;
case F_cl: {
rstream *rsm;
int err = 0;
rsm = (rstream *)hash_search(fdhash, L.s);
debug_printf_eval("OC_FBLTIN close: op1:%p s:'%s' rsm:%p\n", op1, L.s, rsm);
if (rsm) {
debug_printf_eval("OC_FBLTIN F_cl "
"rsm->is_pipe:%d, ->F:%p\n",
rsm->is_pipe, rsm->F);
/* Can be NULL if open failed. Example:
* getline line <"doesnt_exist";
* close("doesnt_exist"); <--- here rsm->F is NULL
*/
if (rsm->F)
err = rsm->is_pipe ? pclose(rsm->F) : fclose(rsm->F);
//TODO: fix this case:
// $ awk 'BEGIN { print close(""); print ERRNO }'
// -1
// close of redirection that was never opened
// (we print 0, 0)
free(rsm->buffer);
hash_remove(fdhash, L.s);
}
if (err)
setvar_i(intvar[ERRNO], errno);
R_d = (double)err;
break;
}
} /* switch */
setvar_i(res, R_d);
break;
}
case XC( OC_BUILTIN ):
debug_printf_eval("BUILTIN\n");
res = exec_builtin(op, res);
break;
case XC( OC_SPRINTF ):
debug_printf_eval("SPRINTF\n");
setvar_p(res, awk_printf(op1, NULL));
break;
case XC( OC_UNARY ):
debug_printf_eval("UNARY\n");
{
double Ld, R_d;
Ld = R_d = getvar_i(R.v);
switch (opn) {
case 'P':
Ld = ++R_d;
goto r_op_change;
case 'p':
R_d++;
goto r_op_change;
case 'M':
Ld = --R_d;
goto r_op_change;
case 'm':
R_d--;
r_op_change:
setvar_i(R.v, R_d);
break;
case '!':
Ld = !istrue(R.v);
break;
case '-':
Ld = -R_d;
break;
}
setvar_i(res, Ld);
break;
}
case XC( OC_FIELD ):
debug_printf_eval("FIELD\n");
{
int i = (int)getvar_i(R.v);
if (i < 0)
syntax_error(EMSG_NEGATIVE_FIELD);
if (i == 0) {
res = intvar[F0];
} else {
split_f0();
if (i > nfields)
fsrealloc(i);
res = &Fields[i - 1];
}
break;
}
/* concatenation (" ") and index joining (",") */
case XC( OC_CONCAT ):
debug_printf_eval("CONCAT /\n");
case XC( OC_COMMA ): {
const char *sep = "";
debug_printf_eval("COMMA\n");
if (opinfo == TI_COMMA)
sep = getvar_s(intvar[SUBSEP]);
setvar_p(res, xasprintf("%s%s%s", L.s, sep, R.s));
break;
}
case XC( OC_LAND ):
debug_printf_eval("LAND\n");
setvar_i(res, istrue(L.v) ? ptest(op->r.n) : 0);
break;
case XC( OC_LOR ):
debug_printf_eval("LOR\n");
setvar_i(res, istrue(L.v) ? 1 : ptest(op->r.n));
break;
case XC( OC_BINARY ):
debug_printf_eval("BINARY /\n");
case XC( OC_REPLACE ):
debug_printf_eval("REPLACE\n");
{
double R_d = getvar_i(R.v);
debug_printf_eval("R_d:%f opn:%c\n", R_d, opn);
switch (opn) {
case '+':
L_d += R_d;
break;
case '-':
L_d -= R_d;
break;
case '*':
L_d *= R_d;
break;
case '/':
if (R_d == 0)
syntax_error(EMSG_DIV_BY_ZERO);
L_d /= R_d;
break;
case '&':
if (ENABLE_FEATURE_AWK_LIBM)
L_d = pow(L_d, R_d);
else
syntax_error(EMSG_NO_MATH);
break;
case '%':
if (R_d == 0)
syntax_error(EMSG_DIV_BY_ZERO);
L_d -= (long long)(L_d / R_d) * R_d;
break;
}
debug_printf_eval("BINARY/REPLACE result:%f\n", L_d);
res = setvar_i(((opinfo & OPCLSMASK) == OC_BINARY) ? res : L.v, L_d);
break;
}
case XC( OC_COMPARE ): {
int i = i; /* for compiler */
double Ld;
debug_printf_eval("COMPARE\n");
if (is_numeric(L.v) && is_numeric(R.v)) {
Ld = getvar_i(L.v) - getvar_i(R.v);
} else {
const char *l = getvar_s(L.v);
const char *r = getvar_s(R.v);
Ld = icase ? strcasecmp(l, r) : strcmp(l, r);
}
switch (opn & 0xfe) {
case 0:
i = (Ld > 0);
break;
case 2:
i = (Ld >= 0);
break;
case 4:
i = (Ld == 0);
break;
}
setvar_i(res, (i == 0) ^ (opn & 1));
break;
}
default:
syntax_error(EMSG_POSSIBLE_ERROR);
} /* switch */
if ((opinfo & OPCLSMASK) <= SHIFT_TIL_THIS)
op = op->a.n;
if ((opinfo & OPCLSMASK) >= RECUR_FROM_THIS)
break;
if (nextrec)
break;
} /* while (op) */
nvfree(tmpvars, 2);
#undef TMPVAR0
#undef TMPVAR1
debug_printf_eval("returning from %s(): %p\n", __func__, res);
return res;
#undef fnargs
#undef seed
#undef sreg
}
/* -------- main & co. -------- */
static int awk_exit(void)
{
unsigned i;
if (!exiting) {
exiting = TRUE;
nextrec = FALSE;
evaluate(endseq.first, &G.exit__tmpvar);
}
/* waiting for children */
for (i = 0; i < fdhash->csize; i++) {
hash_item *hi;
hi = fdhash->items[i];
while (hi) {
if (hi->data.rs.F && hi->data.rs.is_pipe)
pclose(hi->data.rs.F);
hi = hi->next;
}
}
exit(G.exitcode);
}
int awk_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int awk_main(int argc UNUSED_PARAM, char **argv)
{
unsigned opt;
char *opt_F;
llist_t *list_v = NULL;
llist_t *list_f = NULL;
#if ENABLE_FEATURE_AWK_GNU_EXTENSIONS
llist_t *list_e = NULL;
#endif
int i;
INIT_G();
/* Undo busybox.c, or else strtod may eat ','! This breaks parsing:
* $1,$2 == '$1,' '$2', NOT '$1' ',' '$2' */
if (ENABLE_LOCALE_SUPPORT)
setlocale(LC_NUMERIC, "C");
/* initialize variables */
vhash = hash_init();
{
char *vnames = (char *)vNames; /* cheat */
char *vvalues = (char *)vValues;
for (i = 0; *vnames; i++) {
var *v;
intvar[i] = v = newvar(nextword(&vnames));
if (*vvalues != '\377')
setvar_s(v, nextword(&vvalues));
else
setvar_i(v, 0);
if (*vnames == '*') {
v->type |= VF_SPECIAL;
vnames++;
}
}
}
handle_special(intvar[FS]);
handle_special(intvar[RS]);
/* Huh, people report that sometimes environ is NULL. Oh well. */
if (environ) {
char **envp;
for (envp = environ; *envp; envp++) {
/* environ is writable, thus we don't strdup it needlessly */
char *s = *envp;
char *s1 = strchr(s, '=');
if (s1) {
*s1 = '\0';
/* Both findvar and setvar_u take const char*
* as 2nd arg -> environment is not trashed */
setvar_u(findvar(iamarray(intvar[ENVIRON]), s), s1 + 1);
*s1 = '=';
}
}
}
opt = getopt32(argv, OPTSTR_AWK, &opt_F, &list_v, &list_f, IF_FEATURE_AWK_GNU_EXTENSIONS(&list_e,) NULL);
argv += optind;
//argc -= optind;
if (opt & OPT_W)
bb_simple_error_msg("warning: option -W is ignored");
if (opt & OPT_F) {
unescape_string_in_place(opt_F);
setvar_s(intvar[FS], opt_F);
}
while (list_v) {
if (!is_assignment(llist_pop(&list_v)))
bb_show_usage();
}
/* Parse all supplied programs */
fnhash = hash_init();
ahash = hash_init();
while (list_f) {
int fd;
char *s;
g_progname = llist_pop(&list_f);
fd = xopen_stdin(g_progname);
s = xmalloc_read(fd, NULL); /* it's NUL-terminated */
close(fd);
parse_program(s);
free(s);
}
g_progname = "cmd. line";
#if ENABLE_FEATURE_AWK_GNU_EXTENSIONS
while (list_e) {
parse_program(llist_pop(&list_e));
}
#endif
//FIXME: preserve order of -e and -f
//TODO: implement -i LIBRARY and -E FILE too, they are easy-ish
if (!(opt & (OPT_f | OPT_e))) {
if (!*argv)
bb_show_usage();
parse_program(*argv++);
}
/* Free unused parse structures */
//hash_free(fnhash); // ~250 bytes when empty, used only for function names
//^^^^^^^^^^^^^^^^^ does not work, hash_clear() inside SEGVs
// (IOW: hash_clear() assumes it's a hash of variables. fnhash is not).
free(fnhash->items);
free(fnhash);
fnhash = NULL; // debug
//hash_free(ahash); // empty after parsing, will reuse as fdhash instead of freeing
/* Parsing done, on to executing */
/* fill in ARGV array */
setari_u(intvar[ARGV], 0, "awk");
i = 0;
while (*argv)
setari_u(intvar[ARGV], ++i, *argv++);
setvar_i(intvar[ARGC], i + 1);
//fdhash = ahash; // done via define
newfile("/dev/stdin")->F = stdin;
newfile("/dev/stdout")->F = stdout;
newfile("/dev/stderr")->F = stderr;
evaluate(beginseq.first, &G.main__tmpvar);
if (!mainseq.first && !endseq.first)
awk_exit();
/* input file could already be opened in BEGIN block */
if (!iF)
iF = next_input_file();
/* passing through input files */
while (iF) {
nextfile = FALSE;
setvar_i(intvar[FNR], 0);
while ((i = awk_getline(iF, intvar[F0])) > 0) {
nextrec = FALSE;
incvar(intvar[NR]);
incvar(intvar[FNR]);
evaluate(mainseq.first, &G.main__tmpvar);
if (nextfile)
break;
}
if (i < 0)
syntax_error(strerror(errno));
iF = next_input_file();
}
awk_exit();
/*return 0;*/
}