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/*
** strlib.c
** String library to LUA
*/
char *rcs_strlib="$Id: strlib.c,v 1.11 1995/02/02 20:05:37 roberto Exp roberto $";
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include "lua.h"
#include "lualib.h"
static char *newstring (lua_Object o)
{
char *s = lua_getstring(o);
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, *s2, *f;
int init;
lua_Object o1 = lua_getparam (1);
lua_Object o2 = lua_getparam (2);
lua_Object o3 = lua_getparam (3);
lua_Object o4 = lua_getparam (4);
if (!lua_isstring(o1) || !lua_isstring(o2))
lua_error ("incorrect arguments to function `strfind'");
if (o3 == LUA_NOOBJECT)
init = 0;
else if (lua_isnumber(o3))
init = lua_getnumber(o3)-1;
else
{
lua_error ("incorrect arguments to function `strfind'");
return; /* to avoid warnings */
}
s1 = lua_getstring(o1);
s2 = lua_getstring(o2);
f = strstr(s1+init,s2);
if (f != NULL)
{
int pos = f-s1+1;
if (o4 == LUA_NOOBJECT)
lua_pushnumber (pos);
else if (!lua_isnumber(o4))
lua_error ("incorrect arguments to function `strfind'");
else if ((int)lua_getnumber(o4) >= 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)
{
lua_Object o = lua_getparam (1);
if (!lua_isstring(o))
lua_error ("incorrect arguments to function `strlen'");
lua_pushnumber(strlen(lua_getstring(o)));
}
/*
** Return the substring of a string, from start to end
** LUA interface:
** substring = strsub (string, start, end)
*/
static void str_sub (void)
{
int start, end;
char *s;
lua_Object o1 = lua_getparam (1);
lua_Object o2 = lua_getparam (2);
lua_Object o3 = lua_getparam (3);
if (!lua_isstring(o1) || !lua_isnumber(o2))
lua_error ("incorrect arguments to function `strsub'");
if (o3 != LUA_NOOBJECT && !lua_isnumber(o3))
lua_error ("incorrect third argument to function `strsub'");
s = newstring(o1);
start = lua_getnumber (o2);
end = o3 == LUA_NOOBJECT ? strlen(s) : lua_getnumber (o3);
if (end < start || start < 1 || end > strlen(s))
lua_pushliteral("");
else
{
s[end] = 0;
lua_pushstring (&s[start-1]);
}
free(s);
}
/*
** Convert a string to lower case.
** LUA interface:
** lowercase = strlower (string)
*/
static void str_lower (void)
{
char *s, *c;
lua_Object o = lua_getparam (1);
if (!lua_isstring(o))
lua_error ("incorrect arguments to function `strlower'");
c = s = newstring(o);
while (*c != 0)
{
*c = tolower(*c);
c++;
}
lua_pushstring(s);
free(s);
}
/*
** Convert a string to upper case.
** LUA interface:
** uppercase = strupper (string)
*/
static void str_upper (void)
{
char *s, *c;
lua_Object o = lua_getparam (1);
if (!lua_isstring(o))
lua_error ("incorrect arguments to function `strlower'");
c = s = newstring(o);
while (*c != 0)
{
*c = toupper(*c);
c++;
}
lua_pushstring(s);
free(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);
}
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