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- /* A more useful interface to strtol.
- Copyright (C) 1995-1996, 1998-2001, 2003-2007, 2009-2012 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 3 of the License, 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, see <http://www.gnu.org/licenses/>. */
- /* Written by Jim Meyering. */
- #include <config.h>
- /* Some pre-ANSI implementations (e.g. SunOS 4)
- need stderr defined if assertion checking is enabled. */
- #include <stdio.h>
- #ifdef HAVE_ASSERT_H
- #include <assert.h>
- #endif
- #include <ctype.h>
- #include <errno.h>
- #include <inttypes.h>
- #include <limits.h>
- #include <stdlib.h>
- #include <string.h>
- #include "lib/strutil.h"
- /*** global variables ****************************************************************************/
- /*** file scope macro definitions ****************************************************************/
- /*** file scope type declarations ****************************************************************/
- /*** file scope variables ************************************************************************/
- /* --------------------------------------------------------------------------------------------- */
- /*** file scope functions ************************************************************************/
- /* --------------------------------------------------------------------------------------------- */
- static strtol_error_t
- bkm_scale (uintmax_t * x, int scale_factor)
- {
- if (UINTMAX_MAX / scale_factor < *x)
- {
- *x = UINTMAX_MAX;
- return LONGINT_OVERFLOW;
- }
- *x *= scale_factor;
- return LONGINT_OK;
- }
- /* --------------------------------------------------------------------------------------------- */
- static strtol_error_t
- bkm_scale_by_power (uintmax_t * x, int base, int power)
- {
- strtol_error_t err = LONGINT_OK;
- while (power-- != 0)
- err |= bkm_scale (x, base);
- return err;
- }
- /* --------------------------------------------------------------------------------------------- */
- /*** public functions ****************************************************************************/
- /* --------------------------------------------------------------------------------------------- */
- strtol_error_t
- xstrtoumax (const char *s, char **ptr, int base, uintmax_t * val, const char *valid_suffixes)
- {
- char *t_ptr;
- char **p;
- uintmax_t tmp;
- strtol_error_t err = LONGINT_OK;
- #ifdef HAVE_ASSERT_H
- assert (0 <= base && base <= 36);
- #endif
- p = (ptr != NULL ? ptr : &t_ptr);
- {
- const char *q = s;
- unsigned char ch = *q;
- while (isspace (ch))
- ch = *++q;
- if (ch == '-')
- return LONGINT_INVALID;
- }
- errno = 0;
- tmp = strtol (s, p, 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 != NULL && **p != '\0' && strchr (valid_suffixes, **p) != NULL)
- 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 == NULL)
- {
- *val = tmp;
- return err;
- }
- if (**p != '\0')
- {
- int suffixes = 1;
- strtol_error_t overflow;
- if (strchr (valid_suffixes, **p) == NULL)
- {
- *val = tmp;
- return err | LONGINT_INVALID_SUFFIX_CHAR;
- }
- base = 1024;
- if (strchr (valid_suffixes, '0') != NULL)
- {
- /* 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 != '\0')
- err |= LONGINT_INVALID_SUFFIX_CHAR;
- }
- *val = tmp;
- return err;
- }
- /* --------------------------------------------------------------------------------------------- */
|