From 219e88d0505f9c06d42772333995887ca694465a Mon Sep 17 00:00:00 2001
From: Denis Vlasenko <vda.linux@googlemail.com>
Date: Mon, 21 May 2007 10:18:23 +0000
Subject: hush: using smallints where we can. save ~20 bytes in code and some
data storage at runtime.
---
shell/hush.c | 97 +++++++++++++++++++++++++++++++-----------------------------
1 file changed, 50 insertions(+), 47 deletions(-)
diff --git a/shell/hush.c b/shell/hush.c
index 107b821f8..90c89fba2 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -137,9 +137,10 @@ static const char *indenter(int i)
#endif
#define SPECIAL_VAR_SYMBOL 3
-#define FLAG_EXIT_FROM_LOOP 1
-#define FLAG_PARSE_SEMICOLON (1 << 1) /* symbol ';' is special for parser */
-#define FLAG_REPARSING (1 << 2) /* >= 2nd pass */
+
+#define PARSEFLAG_EXIT_FROM_LOOP 1
+#define PARSEFLAG_SEMICOLON (1 << 1) /* symbol ';' is special for parser */
+#define PARSEFLAG_REPARSING (1 << 2) /* >= 2nd pass */
typedef enum {
REDIRECT_INPUT = 1,
@@ -210,10 +211,10 @@ struct p_context {
struct pipe *list_head;
struct pipe *pipe;
struct redir_struct *pending_redirect;
- reserved_style res_w;
- int old_flag; /* for figuring out valid reserved words */
+ smallint res_w;
+ smallint parse_type; /* bitmask of PARSEFLAG_xxx, defines type of parser : ";$" common or special symbol */
+ int old_flag; /* bitmask of FLAG_xxx, for figuring out valid reserved words */
struct p_context *stack;
- int parse_type; /* define type of parser : ";$" common or special symbol */
/* How about quoting status? */
};
@@ -249,17 +250,17 @@ struct pipe {
struct pipe *next;
int num_progs; /* total number of programs in job */
int running_progs; /* number of programs running (not exited) */
- char *cmdbuf; /* buffer various argv's point into */
+ int stopped_progs; /* number of programs alive, but stopped */
#if ENABLE_HUSH_JOB
int jobid; /* job number */
- char *cmdtext; /* name of job */
pid_t pgrp; /* process group ID for the job */
+ char *cmdtext; /* name of job */
#endif
+ char *cmdbuf; /* buffer various argv's point into */
struct child_prog *progs; /* array of commands in pipe */
- int stopped_progs; /* number of programs alive, but stopped */
int job_context; /* bitmask defining current context */
- pipe_style followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
- reserved_style r_mode; /* supports if, for, while, until */
+ smallint followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
+ smallint res_word; /* needed for if, for, while, until... */
};
struct close_me {
@@ -271,8 +272,8 @@ struct variables {
struct variables *next;
const char *name;
const char *value;
- int flg_export;
- int flg_read_only;
+ smallint flg_export;
+ smallint flg_read_only;
};
typedef struct {
@@ -703,8 +704,8 @@ static int builtin_eval(char **argv)
if (argv[1]) {
str = make_string(argv + 1);
- parse_string_outer(str, FLAG_EXIT_FROM_LOOP |
- FLAG_PARSE_SEMICOLON);
+ parse_string_outer(str, PARSEFLAG_EXIT_FROM_LOOP |
+ PARSEFLAG_SEMICOLON);
free(str);
rcode = last_return_code;
}
@@ -1897,10 +1898,11 @@ static void debug_print_tree(struct pipe *pi, int lvl)
};
int pin, prn;
+
pin = 0;
while (pi) {
- fprintf(stderr, "%*spipe %d r_mode=%s followup=%d %s\n", lvl*2, "",
- pin, RES[pi->r_mode], pi->followup, PIPE[pi->followup]);
+ fprintf(stderr, "%*spipe %d res_word=%s followup=%d %s\n", lvl*2, "",
+ pin, RES[pi->res_word], pi->followup, PIPE[pi->followup]);
prn = 0;
while (prn < pi->num_progs) {
struct child_prog *child = &pi->progs[prn];
@@ -1942,21 +1944,22 @@ static int run_list_real(struct pipe *pi)
int rcode = 0; /* probably for gcc only */
int flag_restore = 0;
int if_code = 0, next_if_code = 0; /* need double-buffer to handle elif */
- reserved_style rmode, skip_more_in_this_rmode = RES_XXXX;
+ reserved_style rword;
+ reserved_style skip_more_for_this_rword = RES_XXXX;
debug_printf_exec("run_list_real start lvl %d\n", run_list_level + 1);
/* check syntax for "for" */
for (rpipe = pi; rpipe; rpipe = rpipe->next) {
- if ((rpipe->r_mode == RES_IN || rpipe->r_mode == RES_FOR)
+ if ((rpipe->res_word == RES_IN || rpipe->res_word == RES_FOR)
&& (rpipe->next == NULL)
) {
syntax(); /* unterminated FOR (no IN or no commands after IN) */
debug_printf_exec("run_list_real lvl %d return 1\n", run_list_level);
return 1;
}
- if ((rpipe->r_mode == RES_IN && rpipe->next->r_mode == RES_IN && rpipe->next->progs[0].argv != NULL)
- || (rpipe->r_mode == RES_FOR && rpipe->next->r_mode != RES_IN)
+ if ((rpipe->res_word == RES_IN && rpipe->next->res_word == RES_IN && rpipe->next->progs[0].argv != NULL)
+ || (rpipe->res_word == RES_FOR && rpipe->next->res_word != RES_IN)
) {
/* TODO: what is tested in the first condition? */
syntax(); /* 2nd: malformed FOR (not followed by IN) */
@@ -2008,32 +2011,32 @@ static int run_list_real(struct pipe *pi)
#endif
for (; pi; pi = flag_restore ? rpipe : pi->next) {
- rmode = pi->r_mode;
- if (rmode == RES_WHILE || rmode == RES_UNTIL || rmode == RES_FOR) {
+ rword = pi->res_word;
+ if (rword == RES_WHILE || rword == RES_UNTIL || rword == RES_FOR) {
flag_restore = 0;
if (!rpipe) {
flag_rep = 0;
rpipe = pi;
}
}
- debug_printf_exec(": rmode=%d if_code=%d next_if_code=%d skip_more=%d\n",
- rmode, if_code, next_if_code, skip_more_in_this_rmode);
- if (rmode == skip_more_in_this_rmode && flag_skip) {
+ debug_printf_exec(": rword=%d if_code=%d next_if_code=%d skip_more=%d\n",
+ rword, if_code, next_if_code, skip_more_for_this_rword);
+ if (rword == skip_more_for_this_rword && flag_skip) {
if (pi->followup == PIPE_SEQ)
flag_skip = 0;
continue;
}
flag_skip = 1;
- skip_more_in_this_rmode = RES_XXXX;
- if (rmode == RES_THEN || rmode == RES_ELSE)
+ skip_more_for_this_rword = RES_XXXX;
+ if (rword == RES_THEN || rword == RES_ELSE)
if_code = next_if_code;
- if (rmode == RES_THEN && if_code)
+ if (rword == RES_THEN && if_code)
continue;
- if (rmode == RES_ELSE && !if_code)
+ if (rword == RES_ELSE && !if_code)
continue;
- if (rmode == RES_ELIF && !if_code)
+ if (rword == RES_ELIF && !if_code)
break;
- if (rmode == RES_FOR && pi->num_progs) {
+ if (rword == RES_FOR && pi->num_progs) {
if (!for_lcur) {
/* if no variable values after "in" we skip "for" */
if (!pi->next->progs->argv)
@@ -2059,13 +2062,13 @@ static int run_list_real(struct pipe *pi)
pi->progs->argv[0] = xasprintf("%s=%s", for_varname, *for_lcur++);
pi->progs->glob_result.gl_pathv[0] = pi->progs->argv[0];
}
- if (rmode == RES_IN)
+ if (rword == RES_IN)
continue;
- if (rmode == RES_DO) {
+ if (rword == RES_DO) {
if (!flag_rep)
continue;
}
- if (rmode == RES_DONE) {
+ if (rword == RES_DONE) {
if (flag_rep) {
flag_restore = 1;
} else {
@@ -2107,16 +2110,16 @@ static int run_list_real(struct pipe *pi)
debug_printf_exec(": setting last_return_code=%d\n", rcode);
last_return_code = rcode;
pi->num_progs = save_num_progs; /* restore number of programs */
- if (rmode == RES_IF || rmode == RES_ELIF)
+ if (rword == RES_IF || rword == RES_ELIF)
next_if_code = rcode; /* can be overwritten a number of times */
- if (rmode == RES_WHILE)
+ if (rword == RES_WHILE)
flag_rep = !last_return_code;
- if (rmode == RES_UNTIL)
+ if (rword == RES_UNTIL)
flag_rep = last_return_code;
if ((rcode == EXIT_SUCCESS && pi->followup == PIPE_OR)
|| (rcode != EXIT_SUCCESS && pi->followup == PIPE_AND)
) {
- skip_more_in_this_rmode = rmode;
+ skip_more_for_this_rword = rword;
}
checkjobs(NULL);
}
@@ -2192,7 +2195,7 @@ static int free_pipe_list(struct pipe *head, int indent)
struct pipe *pi, *next;
for (pi = head; pi; pi = next) {
- debug_printf_clean("%s pipe reserved mode %d\n", indenter(indent), pi->r_mode);
+ debug_printf_clean("%s pipe reserved mode %d\n", indenter(indent), pi->res_word);
rcode = free_pipe(pi, indent);
debug_printf_clean("%s pipe followup code %d\n", indenter(indent), pi->followup);
next = pi->next;
@@ -2786,7 +2789,7 @@ static struct pipe *new_pipe(void)
/*pi->next = NULL;*/
/*pi->followup = 0; invalid */
if (RES_NONE)
- pi->r_mode = RES_NONE;
+ pi->res_word = RES_NONE;
return pi;
}
@@ -2898,7 +2901,7 @@ static int done_word(o_string *dest, struct p_context *ctx)
debug_printf_parse("done_word return 1: syntax error, groups and arglists don't mix\n");
return 1;
}
- if (!child->argv && (ctx->parse_type & FLAG_PARSE_SEMICOLON)) {
+ if (!child->argv && (ctx->parse_type & PARSEFLAG_SEMICOLON)) {
debug_printf_parse(": checking '%s' for reserved-ness\n", dest->data);
if (reserved_word(dest, ctx)) {
debug_printf_parse("done_word return %d\n", (ctx->res_w == RES_SNTX));
@@ -2986,7 +2989,7 @@ static int done_pipe(struct p_context *ctx, pipe_style type)
debug_printf_parse("done_pipe entered, followup %d\n", type);
not_null = done_command(ctx); /* implicit closure of previous command */
ctx->pipe->followup = type;
- ctx->pipe->r_mode = ctx->res_w;
+ ctx->pipe->res_word = ctx->res_w;
/* Without this check, even just <enter> on command line generates
* tree of three NOPs (!). Which is harmless but annoying.
* IOW: it is safe to do it unconditionally. */
@@ -3510,7 +3513,7 @@ static int parse_stream_outer(struct in_str *inp, int parse_flag)
ctx.parse_type = parse_flag;
initialize_context(&ctx);
update_charmap();
- if (!(parse_flag & FLAG_PARSE_SEMICOLON) || (parse_flag & FLAG_REPARSING))
+ if (!(parse_flag & PARSEFLAG_SEMICOLON) || (parse_flag & PARSEFLAG_REPARSING))
set_in_charmap(";$&|", CHAR_ORDINARY);
#if ENABLE_HUSH_INTERACTIVE
inp->promptmode = 1;
@@ -3539,7 +3542,7 @@ static int parse_stream_outer(struct in_str *inp, int parse_flag)
free_pipe_list(ctx.list_head, 0);
}
b_free(&temp);
- } while (rcode != -1 && !(parse_flag & FLAG_EXIT_FROM_LOOP)); /* loop on syntax errors, return on EOF */
+ } while (rcode != -1 && !(parse_flag & PARSEFLAG_EXIT_FROM_LOOP)); /* loop on syntax errors, return on EOF */
return 0;
}
@@ -3555,7 +3558,7 @@ static int parse_file_outer(FILE *f)
int rcode;
struct in_str input;
setup_file_in_str(&input, f);
- rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON);
+ rcode = parse_stream_outer(&input, PARSEFLAG_SEMICOLON);
return rcode;
}
@@ -3646,7 +3649,7 @@ int hush_main(int argc, char **argv)
case 'c':
global_argv = argv + optind;
global_argc = argc - optind;
- opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON);
+ opt = parse_string_outer(optarg, PARSEFLAG_SEMICOLON);
goto final_return;
case 'i':
/* Well, we cannot just declare interactiveness,
--
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