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small "abstraction"

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This commit is contained in:
Roberto Ierusalimschy 1996-03-22 14:57:24 -03:00
parent f1d0276684
commit df1ee1fb1c
1 changed files with 12 additions and 11 deletions
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23
strlib.c
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@ -3,12 +3,13 @@
** String library to LUA
*/
char *rcs_strlib="$Id: strlib.c,v 1.20 1996/03/19 22:28:37 roberto Exp roberto $";
char *rcs_strlib="$Id: strlib.c,v 1.21 1996/03/21 22:18:08 roberto Exp roberto $";
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <limits.h>
#include "lua.h"
#include "lualib.h"
@ -37,6 +38,12 @@ double lua_check_number (int numArg, char *funcname)
return lua_getnumber(o);
}
static int lua_opt_number (int numArg, int def, char *funcname)
{
return (lua_getparam(numArg) == LUA_NOOBJECT) ? def :
(int)lua_check_number(numArg, funcname);
}
char *luaI_addchar (int c)
{
static char *buff = NULL;
@ -73,15 +80,12 @@ 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;
int init = lua_opt_number(3, 1, "strfind") - 1;
char *f = (init>=0 && init<=strlen(s1)) ? strstr(s1+init,s2) : NULL;
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)
if (lua_opt_number(4, INT_MAX, "strfind") >= pos+strlen(s2)-1)
lua_pushnumber (pos);
else
lua_pushnil();
@ -111,8 +115,7 @@ 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");
int end = lua_opt_number(3, strlen(s), "strsub");
if (end < start || start < 1 || end > strlen(s))
lua_pushliteral("");
else
@ -159,9 +162,7 @@ static void str_upper (void)
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;
int pos = lua_opt_number(2, 1, "ascii") - 1;
if (pos<0 || pos>=strlen(s))
lua_arg_error("ascii");
lua_pushnumber(s[pos]);