125 lines
2.6 KiB
C
125 lines
2.6 KiB
C
/* Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
|
|
Written by James Clark (jjc@jclark.com)
|
|
|
|
This file is part of groff.
|
|
|
|
groff is free software; you can redistribute it and/or modify it under
|
|
the terms of the GNU General Public License as published by the Free
|
|
Software Foundation; either version 2, or (at your option) any later
|
|
version.
|
|
|
|
groff is distributed in the hope that it will be useful, but WITHOUT ANY
|
|
WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
for more details.
|
|
|
|
You should have received a copy of the GNU General Public License along
|
|
with groff; see the file COPYING. If not, write to the Free Software
|
|
Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
|
|
|
|
#ifndef lint
|
|
static char rcsid[] = "$Id: strtol.c,v 1.2 1993/08/02 17:44:06 mycroft Exp $";
|
|
#endif /* not lint */
|
|
|
|
#include <string.h>
|
|
#include <ctype.h>
|
|
#include <errno.h>
|
|
#ifndef errno
|
|
extern int errno;
|
|
#endif
|
|
|
|
#ifdef HAVE_LIMITS_H
|
|
#include <limits.h>
|
|
#endif
|
|
|
|
#ifndef LONG_MAX
|
|
#define LONG_MAX 2147483647
|
|
#endif
|
|
|
|
#ifndef LONG_MIN
|
|
#define LONG_MIN (-LONG_MAX-1)
|
|
#endif
|
|
|
|
long strtol(str, ptr, base)
|
|
char *str, **ptr;
|
|
int base;
|
|
{
|
|
char *start = str;
|
|
int neg = 0;
|
|
long val;
|
|
char *p;
|
|
static char digits[] = "0123456789abcdefghijklmnopqrstuvwxyz";
|
|
|
|
while (isascii(*str) && isspace(*str))
|
|
str++;
|
|
|
|
if (*str == '-') {
|
|
neg = 1;
|
|
str++;
|
|
}
|
|
if (base == 0) {
|
|
if (*str == '0') {
|
|
if (str[1] == 'x' || str[1] == 'X') {
|
|
str += 2;
|
|
base = 16;
|
|
}
|
|
else
|
|
base = 8;
|
|
}
|
|
else
|
|
base = 10;
|
|
}
|
|
if (base < 2 || base > 36)
|
|
base = 10;
|
|
else if (base == 16 && *str == '0' && (str[1] == 'x' || str[1] == 'X'))
|
|
str += 2;
|
|
|
|
p = strchr(digits, isascii(*str) && isupper(*str) ? tolower(*str) : *str);
|
|
if (p == 0 || (val = (p - digits)) >= base) {
|
|
if (base == 16 && str > start && (str[-1] == 'x' || str[-1] == 'X')) {
|
|
if (ptr)
|
|
*ptr = str - 1;
|
|
}
|
|
else {
|
|
if (ptr)
|
|
*ptr = start;
|
|
errno = ERANGE;
|
|
}
|
|
return 0;
|
|
}
|
|
if (neg)
|
|
val = -val;
|
|
|
|
while (*++str != '\0') {
|
|
int n;
|
|
|
|
p = strchr(digits, isascii(*str) && isupper(*str) ? tolower(*str) : *str);
|
|
if (p == 0)
|
|
break;
|
|
n = p - digits;
|
|
if (n >= base)
|
|
break;
|
|
if (neg) {
|
|
if (-(unsigned long)val > (-(unsigned long)LONG_MIN - n)/base) {
|
|
val = LONG_MIN;
|
|
errno = ERANGE;
|
|
}
|
|
else
|
|
val = val*base - n;
|
|
}
|
|
else {
|
|
if (val > (LONG_MAX - n)/base) {
|
|
val = LONG_MAX;
|
|
errno = ERANGE;
|
|
}
|
|
else
|
|
val = val*base + n;
|
|
}
|
|
}
|
|
|
|
if (ptr)
|
|
*ptr = str;
|
|
|
|
return val;
|
|
}
|