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/* strtol - Convert string representation of a number into an integer value.
Copyright (C) 1997 Free Software Foundation, Inc.
This program 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.
This program 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 this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include <config.h>
#if !defined (HAVE_STRTOL)
#include <ctype.h>
#include <errno.h>
#ifndef errno
extern int errno;
#endif
#ifndef __set_errno
# define __set_errno(Val) errno = (Val)
#endif
#ifdef HAVE_LIMITS_H
# include <limits.h>
#endif
#include <bashansi.h>
#ifndef NULL
# define NULL 0
#endif
/* Nonzero if we are defining `strtoul', operating on unsigned integers. */
#ifndef UNSIGNED
# define UNSIGNED 0
# define RETTYPE long
#else
# define RETTYPE unsigned long
#endif
/* Determine the name. */
#if UNSIGNED
# define strtol strtoul
#endif
#ifndef CHAR_BIT
# define CHAR_BIT 8
#endif
#ifndef ULONG_MAX
# define ULONG_MAX ((unsigned long) ~(unsigned long) 0)
# define ULONG_MIN ((unsigned long) 0 - ULONG_MAX)
#endif
#ifndef LONG_MAX
# define LONG_MAX ((long) (ULONG_MAX >> 1))
# define LONG_MIN ((long) (0 - LONG_MAX))
#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. */
RETTYPE
strtol (nptr, endptr, base)
const char *nptr;
char **endptr;
int base;
{
int negative;
register unsigned long cutoff, i;
register unsigned int cutlim;
register const char *s;
register unsigned char c;
const char *save, *end;
int overflow;
if (base < 0 || base == 1 || base > 36)
base = 10;
save = s = nptr;
/* Skip white space. */
while (isspace (*s))
++s;
if (*s == '\0')
goto noconv;
/* Check for a sign. */
if (*s == '-' || *s == '+')
{
negative = (*s == '-');
++s;
}
else
negative = 0;
if (base == 16 && *s == '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;
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 (c >= '0' && c <= '9')
c -= '0';
else if (isalpha (c))
c = toupper (c) - 'A' + 10;
else
break;
if ((int) 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 (overflow == 0
&& i > (negative
? -((unsigned long) (LONG_MIN + 1)) + 1
: (unsigned long) LONG_MAX))
overflow = 1;
#endif
if (overflow)
{
__set_errno (ERANGE);
#if UNSIGNED
return ULONG_MAX;
#else
return negative ? LONG_MIN : LONG_MAX;
#endif
}
/* Return the result with the appropriate sign. */
return (negative ? -i : i);
noconv:
/* We must handle a special case here: the base is 0 or 16 and the
first two characters are '0' and 'x', but the rest are no
hexadecimal digits. This is no error case. We return 0 and
ENDPTR points to the `x'. */
if (endptr != NULL)
{
if (save - nptr >= 2 && toupper (save[-1]) == 'X' && save[-2] == '0')
*endptr = (char *) &save[-1];
else
/* There was no number to convert. */
*endptr = (char *) nptr;
}
return 0L;
}
#endif /* !HAVE_STRTOL */
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