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/* A more useful interface to strtol.
Copyright (C) 1995, 1996, 1998 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. */
/* Written by Jim Meyering. */
#if HAVE_CONFIG_H
# include <config.h>
#endif
#if STDC_HEADERS
# include <stdlib.h>
#endif
#if HAVE_STRING_H
# include <string.h>
#else
# include <strings.h>
# ifndef strchr
# define strchr index
# endif
#endif
#include <assert.h>
#include <errno.h>
#ifndef errno
extern int errno;
#endif
#if HAVE_LIMITS_H
# include <limits.h>
#endif
#ifndef CHAR_BIT
# define CHAR_BIT 8
#endif
/* The extra casts work around common compiler bugs. */
#define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
/* The outer cast is needed to work around a bug in Cray C 5.0.3.0.
It is necessary at least when t == time_t. */
#define TYPE_MINIMUM(t) ((t) (TYPE_SIGNED (t) \
? ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1) : (t) 0))
#define TYPE_MAXIMUM(t) (~ (t) 0 - TYPE_MINIMUM (t))
#ifndef ULONG_MAX
# define ULONG_MAX TYPE_MAXIMUM (unsigned long int)
#endif
#ifndef LONG_MAX
# define LONG_MAX TYPE_MAXIMUM (long int)
#endif
#include "xstrtol.h"
__unsigned long int __strtol ();
static int
bkm_scale (__unsigned long int *x, int scale_factor)
{
__unsigned long int product = *x * scale_factor;
if (*x != product / scale_factor)
return 1;
*x = product;
return 0;
}
static int
bkm_scale_by_power (__unsigned long int *x, int base, int power)
{
while (power--)
if (bkm_scale (x, base))
return 1;
return 0;
}
/* FIXME: comment. */
strtol_error
__xstrtol (const char *s, char **ptr, int strtol_base,
__unsigned long int *val, const char *valid_suffixes)
{
char *t_ptr;
char **p;
__unsigned long int tmp;
assert (0 <= strtol_base && strtol_base <= 36);
p = (ptr ? ptr : &t_ptr);
errno = 0;
tmp = __strtol (s, p, strtol_base);
if (errno != 0)
return LONGINT_OVERFLOW;
if (*p == s)
return LONGINT_INVALID;
/* Let valid_suffixes == NULL mean `allow any suffix'. */
/* FIXME: update all callers except the one in tail.c changing
last parameter NULL to `""'. */
if (!valid_suffixes)
{
*val = tmp;
return LONGINT_OK;
}
if (**p != '\0')
{
int base = 1024;
int suffixes = 1;
int overflow;
if (!strchr (valid_suffixes, **p))
return LONGINT_INVALID_SUFFIX_CHAR;
if (strchr (valid_suffixes, '0'))
{
/* The ``valid suffix'' '0' is a special flag meaning that
an optional second suffix is allowed, which can change
the base, e.g. "100MD" for 100 megabytes decimal. */
switch (p[0][1])
{
case 'B':
suffixes++;
break;
case 'D':
base = 1000;
suffixes++;
break;
}
}
switch (**p)
{
case 'b':
overflow = bkm_scale (&tmp, 512);
break;
case 'B':
overflow = bkm_scale (&tmp, 1024);
break;
case 'c':
overflow = 0;
break;
case 'E': /* Exa */
overflow = bkm_scale_by_power (&tmp, base, 6);
break;
case 'G': /* Giga */
overflow = bkm_scale_by_power (&tmp, base, 3);
break;
case 'k': /* kilo */
overflow = bkm_scale_by_power (&tmp, base, 1);
break;
case 'M': /* Mega */
case 'm': /* 'm' is undocumented; for backward compatibility only */
overflow = bkm_scale_by_power (&tmp, base, 2);
break;
case 'P': /* Peta */
overflow = bkm_scale_by_power (&tmp, base, 5);
break;
case 'T': /* Tera */
overflow = bkm_scale_by_power (&tmp, base, 4);
break;
case 'w':
overflow = bkm_scale (&tmp, 2);
break;
case 'Y': /* Yotta */
overflow = bkm_scale_by_power (&tmp, base, 8);
break;
case 'Z': /* Zetta */
overflow = bkm_scale_by_power (&tmp, base, 7);
break;
default:
return LONGINT_INVALID_SUFFIX_CHAR;
break;
}
if (overflow)
return LONGINT_OVERFLOW;
(*p) += suffixes;
}
*val = tmp;
return LONGINT_OK;
}
#ifdef TESTING_XSTRTO
# include <stdio.h>
# include "error.h"
char *program_name;
int
main (int argc, char** argv)
{
strtol_error s_err;
int i;
program_name = argv[0];
for (i=1; i<argc; i++)
{
char *p;
__unsigned long int val;
s_err = __xstrtol (argv[i], &p, 0, &val, "bckmw");
if (s_err == LONGINT_OK)
{
printf ("%s->%lu (%s)\n", argv[i], val, p);
}
else
{
STRTOL_FATAL_ERROR (argv[i], "arg", s_err);
}
}
exit (0);
}
#endif /* TESTING_XSTRTO */
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