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/*
** strlib.c
** String library to LUA
*/
char *rcs_strlib="$Id: strlib.c,v 1.13 1995/10/09 12:49:21 roberto Exp roberto $";
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include "lua.h"
#include "lualib.h"
void lua_arg_error(char *funcname)
{
char buff[100];
sprintf(buff, "incorrect arguments to function `%s'", funcname);
lua_error(buff);
}
char *lua_check_string (int numArg, char *funcname)
{
lua_Object o = lua_getparam(numArg);
if (!(lua_isstring(o) || lua_isnumber(o)))
lua_arg_error(funcname);
return lua_getstring(o);
}
float lua_check_number (int numArg, char *funcname)
{
lua_Object o = lua_getparam(numArg);
if (!lua_isnumber(o))
lua_arg_error(funcname);
return lua_getnumber(o);
}
static char *newstring (char *s)
{
char *ns = (char *)malloc(strlen(s)+1);
if (ns == 0)
lua_error("not enough memory for new string");
strcpy(ns, s);
return ns;
}
/*
** Return the position of the first caracter of a substring into a string
** LUA interface:
** n = strfind (string, substring, init, end)
*/
static void str_find (void)
{
char *s1 = lua_check_string(1, "strfind");
char *s2 = lua_check_string(2, "strfind");
int init = (lua_getparam(3) == LUA_NOOBJECT) ? 0 :
(int)lua_check_number(3, "strfind")-1;
char *f = strstr(s1+init,s2);
if (f != NULL)
{
int pos = f-s1+1;
if (lua_getparam (4) == LUA_NOOBJECT)
lua_pushnumber (pos);
else if ((int)lua_check_number(4, "strfind") >= pos+strlen(s2)-1)
lua_pushnumber (pos);
else
lua_pushnil();
}
else
lua_pushnil();
}
/*
** Return the string length
** LUA interface:
** n = strlen (string)
*/
static void str_len (void)
{
char *s = lua_check_string(1, "strlen");
lua_pushnumber(strlen(s));
}
/*
** Return the substring of a string, from start to end
** LUA interface:
** substring = strsub (string, start, end)
*/
static void str_sub (void)
{
char *s = lua_check_string(1, "strsub");
int start = (int)lua_check_number(2, "strsub");
int end = (lua_getparam(3) == LUA_NOOBJECT) ? strlen(s) :
(int)lua_check_number(3, "strsub");
if (end < start || start < 1 || end > strlen(s))
lua_pushliteral("");
else
{
char temp = s[end];
s[end] = 0;
lua_pushstring (&s[start-1]);
s[end] = temp;
}
}
/*
** Convert a string according to given function.
*/
typedef int (*strfunc)(int s);
static void str_apply (strfunc f, char *funcname)
{
char *s, *c;
c = s = newstring(lua_check_string(1, funcname));
while (*c != 0)
{
*c = f(*c);
c++;
}
lua_pushstring(s);
free(s);
}
/*
** Convert a string to lower case.
** LUA interface:
** lowercase = strlower (string)
*/
static void str_lower (void)
{
str_apply(tolower, "strlower");
}
/*
** Convert a string to upper case.
** LUA interface:
** uppercase = strupper (string)
*/
static void str_upper (void)
{
str_apply(toupper, "strupper");
}
/*
** get ascii value of a character in a string
*/
static void str_ascii (void)
{
char *s = lua_check_string(1, "ascii");
lua_Object o2 = lua_getparam(2);
int pos;
pos = (o2 == LUA_NOOBJECT) ? 0 : (int)lua_check_number(2, "ascii")-1;
if (pos<0 || pos>=strlen(s))
lua_arg_error("ascii");
lua_pushnumber(s[pos]);
}
/*
** converts one or more integers to chars in a string
*/
#define maxparams 50
static void str_int2str (void)
{
char s[maxparams+1];
int i = 0;
while (lua_getparam(++i) != LUA_NOOBJECT)
{
if (i > maxparams)
lua_error("too many parameters to function `int2str'");
s[i-1] = (int)lua_check_number(i, "int2str");
}
s[i-1] = 0;
lua_pushstring(s);
}
/*
** Open string library
*/
void strlib_open (void)
{
lua_register ("strfind", str_find);
lua_register ("strlen", str_len);
lua_register ("strsub", str_sub);
lua_register ("strlower", str_lower);
lua_register ("strupper", str_upper);
lua_register ("ascii", str_ascii);
lua_register ("int2str", str_int2str);
}
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