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/* strtol.c - convert a string to an unsigned long int.
Copyright 1997 Karl Berry.
Copyright 1991, 1992, 1994, 1995 Free Software Foundation, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* The original code in this file came from the GNU C Library,
with modifications to fit libkpathsea.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#ifdef _LIBC
# define USE_NUMBER_GROUPING
# define STDC_HEADERS
# define HAVE_LIMITS_H
#endif
#include <ctype.h>
#include <errno.h>
#ifndef errno
extern int errno;
#endif
#ifdef HAVE_LIMITS_H
# include <limits.h>
#endif
#ifdef STDC_HEADERS
# include <stddef.h>
# include <stdlib.h>
#else
# ifndef NULL
# define NULL 0
# endif
#endif
#ifdef USE_NUMBER_GROUPING
# include "../locale/localeinfo.h"
#endif
/* Nonzero if we are defining `strtoul' or `strtouq', operating on
unsigned integers. */
#ifndef UNSIGNED
# define UNSIGNED 0
# define INT LONG int
#else
# define strtol strtoul
# define INT unsigned LONG int
#endif
/* If QUAD is defined, we are defining `strtoq' or `strtouq',
operating on `long long int's. */
#ifdef QUAD
# if UNSIGNED
# define strtoul strtouq
# else
# define strtol strtoq
# endif
# define LONG long long
# undef LONG_MIN
# define LONG_MIN LONG_LONG_MIN
# undef LONG_MAX
# define LONG_MAX LONG_LONG_MAX
# undef ULONG_MAX
# define ULONG_MAX ULONG_LONG_MAX
# if __GNUC__ == 2 && __GNUC_MINOR__ < 7
/* Work around gcc bug with using this constant. */
static const unsigned long long int maxquad = ULONG_LONG_MAX;
# undef ULONG_MAX
# define ULONG_MAX maxquad
# endif
#else
# define LONG long
#endif
#ifdef __STDC__
# define INTERNAL(x) INTERNAL1(x)
# define INTERNAL1(x) __##x##_internal
#else
# define INTERNAL(x) __/**/x/**/_internal
#endif
#ifdef USE_NUMBER_GROUPING
/* This file defines a function to check for correct grouping. */
# include "grouping.h"
#endif
/* Convert NPTR to an `unsigned long int' or `long int' in base BASE.
If BASE is 0 the base is determined by the presence of a leading
zero, indicating octal or a leading "0x" or "0X", indicating hexadecimal.
If BASE is < 2 or > 36, it is reset to 10.
If ENDPTR is not NULL, a pointer to the character after the last
one converted is stored in *ENDPTR. */
INT
INTERNAL (strtol) (nptr, endptr, base, group)
const char *nptr;
char **endptr;
int base;
int group;
{
int negative;
register unsigned LONG int cutoff;
register unsigned int cutlim;
register unsigned LONG int i;
register const char *s;
register unsigned char c;
const char *save, *end;
int overflow;
#ifdef USE_NUMBER_GROUPING
/* The thousands character of the current locale. */
wchar_t thousands;
/* The numeric grouping specification of the current locale,
in the format described in <locale.h>. */
const char *grouping;
if (group)
{
grouping = _NL_CURRENT (LC_NUMERIC, GROUPING);
if (*grouping <= 0 || *grouping == CHAR_MAX)
grouping = NULL;
else
{
/* Figure out the thousands separator character. */
if (mbtowc (&thousands, _NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP),
strlen (_NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP))) <= 0)
thousands = (wchar_t) *_NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP);
if (thousands == L'\0')
grouping = NULL;
}
}
else
grouping = NULL;
#endif
if (base < 0 || base == 1 || base > 36)
base = 10;
s = nptr;
/* Skip white space. */
while (isspace (*s))
++s;
if (*s == '\0')
goto noconv;
/* Check for a sign. */
if (*s == '-')
{
negative = 1;
++s;
}
else if (*s == '+')
{
negative = 0;
++s;
}
else
negative = 0;
if (base == 16 && s[0] == '0' && toupper (s[1]) == 'X')
s += 2;
/* If BASE is zero, figure it out ourselves. */
if (base == 0)
if (*s == '0')
{
if (toupper (s[1]) == 'X')
{
s += 2;
base = 16;
}
else
base = 8;
}
else
base = 10;
/* Save the pointer so we can check later if anything happened. */
save = s;
#ifdef USE_NUMBER_GROUPING
if (group)
{
/* Find the end of the digit string and check its grouping. */
end = s;
for (c = *end; c != '\0'; c = *++end)
if (c != thousands && !isdigit (c) &&
(!isalpha (c) || toupper (c) - 'A' + 10 >= base))
break;
if (*s == thousands)
end = s;
else
end = correctly_grouped_prefix (s, end, thousands, grouping);
}
else
#endif
end = NULL;
cutoff = ULONG_MAX / (unsigned LONG int) base;
cutlim = ULONG_MAX % (unsigned LONG int) base;
overflow = 0;
i = 0;
for (c = *s; c != '\0'; c = *++s)
{
if (s == end)
break;
if (isdigit (c))
c -= '0';
else if (isalpha (c))
c = toupper (c) - 'A' + 10;
else
break;
if (c >= base)
break;
/* Check for overflow. */
if (i > cutoff || (i == cutoff && c > cutlim))
overflow = 1;
else
{
i *= (unsigned LONG int) base;
i += c;
}
}
/* Check if anything actually happened. */
if (s == save)
goto noconv;
/* Store in ENDPTR the address of one character
past the last character we converted. */
if (endptr != NULL)
*endptr = (char *) s;
#if !UNSIGNED
/* Check for a value that is within the range of
`unsigned LONG int', but outside the range of `LONG int'. */
if (i > (negative ?
-(unsigned LONG int) LONG_MIN : (unsigned LONG int) LONG_MAX))
overflow = 1;
#endif
if (overflow)
{
errno = ERANGE;
#if UNSIGNED
return ULONG_MAX;
#else
return negative ? LONG_MIN : LONG_MAX;
#endif
}
/* Return the result of the appropriate sign. */
return (negative ? -i : i);
noconv:
/* There was no number to convert. */
if (endptr != NULL)
*endptr = (char *) nptr;
return 0L;
}
/* External user entry point. */
#ifdef weak_symbol
weak_symbol (strtol)
#endif
INT
strtol (nptr, endptr, base)
const char *nptr;
char **endptr;
int base;
{
return INTERNAL (strtol) (nptr, endptr, base, 0);
}
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