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DEFINITIONS
This source file includes following definitions.
- bkm_scale
- bkm_scale_by_power
- __xstrtol
- main
/* A more useful interface to strtol.
Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2003, 2004, 2005, 2006
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
/* Written by Jim Meyering. */
#ifndef __strtol
# define __strtol strtol
# define __strtol_t long int
# define __xstrtol xstrtol
# define STRTOL_T_MINIMUM LONG_MIN
# define STRTOL_T_MAXIMUM LONG_MAX
#endif
#include <config.h>
#include "xstrtol.h"
/* Some pre-ANSI implementations (e.g. SunOS 4)
need stderr defined if assertion checking is enabled. */
#include <stdio.h>
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include "intprops.h"
static strtol_error
bkm_scale (__strtol_t *x, int scale_factor)
{
if (TYPE_SIGNED (__strtol_t) && *x < STRTOL_T_MINIMUM / scale_factor)
{
*x = STRTOL_T_MINIMUM;
return LONGINT_OVERFLOW;
}
if (STRTOL_T_MAXIMUM / scale_factor < *x)
{
*x = STRTOL_T_MAXIMUM;
return LONGINT_OVERFLOW;
}
*x *= scale_factor;
return LONGINT_OK;
}
static strtol_error
bkm_scale_by_power (__strtol_t *x, int base, int power)
{
strtol_error err = LONGINT_OK;
while (power--)
err |= bkm_scale (x, base);
return err;
}
/* FIXME: comment. */
strtol_error
__xstrtol (const char *s, char **ptr, int strtol_base,
__strtol_t *val, const char *valid_suffixes)
{
char *t_ptr;
char **p;
__strtol_t tmp;
strtol_error err = LONGINT_OK;
assert (0 <= strtol_base && strtol_base <= 36);
p = (ptr ? ptr : &t_ptr);
if (! TYPE_SIGNED (__strtol_t))
{
const char *q = s;
unsigned char ch = *q;
while (isspace (ch))
ch = *++q;
if (ch == '-')
return LONGINT_INVALID;
}
errno = 0;
tmp = __strtol (s, p, strtol_base);
if (*p == s)
{
/* If there is no number but there is a valid suffix, assume the
number is 1. The string is invalid otherwise. */
if (valid_suffixes && **p && strchr (valid_suffixes, **p))
tmp = 1;
else
return LONGINT_INVALID;
}
else if (errno != 0)
{
if (errno != ERANGE)
return LONGINT_INVALID;
err = LONGINT_OVERFLOW;
}
/* Let valid_suffixes == NULL mean `allow any suffix'. */
/* FIXME: update all callers except the ones that allow suffixes
after the number, changing last parameter NULL to `""'. */
if (!valid_suffixes)
{
*val = tmp;
return err;
}
if (**p != '\0')
{
int base = 1024;
int suffixes = 1;
strtol_error overflow;
if (!strchr (valid_suffixes, **p))
{
*val = tmp;
return err | 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. A suffix "B" (e.g. "100MB") stands for a power
of 1000, whereas a suffix "iB" (e.g. "100MiB") stands for
a power of 1024. If no suffix (e.g. "100M"), assume
power-of-1024. */
switch (p[0][1])
{
case 'i':
if (p[0][2] == 'B')
suffixes += 2;
break;
case 'B':
case 'D': /* 'D' is obsolescent */
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 or exbi */
overflow = bkm_scale_by_power (&tmp, base, 6);
break;
case 'G': /* giga or gibi */
case 'g': /* 'g' is undocumented; for compatibility only */
overflow = bkm_scale_by_power (&tmp, base, 3);
break;
case 'k': /* kilo */
case 'K': /* kibi */
overflow = bkm_scale_by_power (&tmp, base, 1);
break;
case 'M': /* mega or mebi */
case 'm': /* 'm' is undocumented; for compatibility only */
overflow = bkm_scale_by_power (&tmp, base, 2);
break;
case 'P': /* peta or pebi */
overflow = bkm_scale_by_power (&tmp, base, 5);
break;
case 'T': /* tera or tebi */
case 't': /* 't' is undocumented; for compatibility only */
overflow = bkm_scale_by_power (&tmp, base, 4);
break;
case 'w':
overflow = bkm_scale (&tmp, 2);
break;
case 'Y': /* yotta or 2**80 */
overflow = bkm_scale_by_power (&tmp, base, 8);
break;
case 'Z': /* zetta or 2**70 */
overflow = bkm_scale_by_power (&tmp, base, 7);
break;
default:
*val = tmp;
return err | LONGINT_INVALID_SUFFIX_CHAR;
}
err |= overflow;
*p += suffixes;
if (**p)
err |= LONGINT_INVALID_SUFFIX_CHAR;
}
*val = tmp;
return err;
}
#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;
__strtol_t 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 */