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correct handling of negative numbers in non-10 bases by 'tonumber' 

(e.g., tonumber(-34, 8))
This commit is contained in:
Roberto Ierusalimschy 2010-10-28 13:36:30 -02:00
parent da57477c3d
commit e642cc4206
1 changed files with 5 additions and 2 deletions
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7
lbaselib.c
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@ -1,5 +1,5 @@
/*
** $Id: lbaselib.c,v 1.249 2010/09/07 19:21:39 roberto Exp roberto $
** $Id: lbaselib.c,v 1.250 2010/09/07 19:38:36 roberto Exp roberto $
** Basic library
** See Copyright Notice in lua.h
*/
@ -56,12 +56,15 @@ static int luaB_tonumber (lua_State *L) {
const char *s1 = luaL_checkstring(L, 1);
char *s2;
unsigned long n;
int neg = 0;
luaL_argcheck(L, 2 <= base && base <= 36, 2, "base out of range");
while (isspace((unsigned char)(*s1))) s1++; /* skip initial spaces */
if (*s1 == '-') { s1++; neg = 1; }
n = strtoul(s1, &s2, base);
if (s1 != s2) { /* at least one valid digit? */
while (isspace((unsigned char)(*s2))) s2++; /* skip trailing spaces */
if (*s2 == '\0') { /* no invalid trailing characters? */
lua_pushnumber(L, (lua_Number)n);
lua_pushnumber(L, (neg) ? -(lua_Number)n : (lua_Number)n);
return 1;
}
}