mirror of
https://github.com/lua/lua
synced 2024-11-22 12:51:30 +03:00
134 lines
2.7 KiB
C
134 lines
2.7 KiB
C
/*
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** strlib.c
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** String library to LUA
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*/
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char *rcs_strlib="$Id: strlib.c,v 1.6 1994/12/13 15:54:21 roberto Exp roberto $";
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#include <string.h>
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#include <ctype.h>
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#include "mem.h"
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#include "lua.h"
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#include "lualib.h"
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/*
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** Return the position of the first caracter of a substring into a string
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** LUA interface:
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** n = strfind (string, substring)
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*/
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static void str_find (void)
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{
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char *s1, *s2, *f;
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lua_Object o1 = lua_getparam (1);
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lua_Object o2 = lua_getparam (2);
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if (!lua_isstring(o1) || !lua_isstring(o2))
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lua_error ("incorrect arguments to function `strfind'");
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s1 = lua_getstring(o1);
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s2 = lua_getstring(o2);
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f = strstr(s1,s2);
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if (f != NULL)
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lua_pushnumber (f-s1+1);
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else
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lua_pushnil();
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}
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/*
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** Return the string length
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** LUA interface:
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** n = strlen (string)
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*/
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static void str_len (void)
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{
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lua_Object o = lua_getparam (1);
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if (!lua_isstring(o))
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lua_error ("incorrect arguments to function `strlen'");
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lua_pushnumber(strlen(lua_getstring(o)));
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}
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/*
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** Return the substring of a string, from start to end
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** LUA interface:
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** substring = strsub (string, start, end)
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*/
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static void str_sub (void)
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{
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int start, end;
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char *s;
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lua_Object o1 = lua_getparam (1);
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lua_Object o2 = lua_getparam (2);
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lua_Object o3 = lua_getparam (3);
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if (!lua_isstring(o1) || !lua_isnumber(o2))
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lua_error ("incorrect arguments to function `strsub'");
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if (o3 != LUA_NOOBJECT && !lua_isnumber(o3))
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lua_error ("incorrect third argument to function `strsub'");
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s = lua_copystring(o1);
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start = lua_getnumber (o2);
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end = o3 == NULL ? strlen(s) : lua_getnumber (o3);
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if (end < start || start < 1 || end > strlen(s))
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lua_pushliteral("");
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else
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{
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s[end] = 0;
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lua_pushstring (&s[start-1]);
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}
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luaI_free(s);
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}
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/*
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** Convert a string to lower case.
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** LUA interface:
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** lowercase = strlower (string)
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*/
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static void str_lower (void)
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{
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char *s, *c;
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lua_Object o = lua_getparam (1);
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if (!lua_isstring(o))
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lua_error ("incorrect arguments to function `strlower'");
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c = s = strdup(lua_getstring(o));
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while (*c != 0)
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{
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*c = tolower(*c);
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c++;
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}
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lua_pushstring(s);
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luaI_free(s);
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}
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/*
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** Convert a string to upper case.
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** LUA interface:
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** uppercase = strupper (string)
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*/
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static void str_upper (void)
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{
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char *s, *c;
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lua_Object o = lua_getparam (1);
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if (!lua_isstring(o))
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lua_error ("incorrect arguments to function `strlower'");
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c = s = strdup(lua_getstring(o));
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while (*c != 0)
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{
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*c = toupper(*c);
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c++;
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}
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lua_pushstring(s);
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luaI_free(s);
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}
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/*
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** Open string library
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*/
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void strlib_open (void)
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{
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lua_register ("strfind", str_find);
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lua_register ("strlen", str_len);
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lua_register ("strsub", str_sub);
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lua_register ("strlower", str_lower);
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lua_register ("strupper", str_upper);
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}
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