diff options
Diffstat (limited to 'lib/strutil/xstrtol.c')
| -rw-r--r-- | lib/strutil/xstrtol.c | 256 |
1 files changed, 256 insertions, 0 deletions
diff --git a/lib/strutil/xstrtol.c b/lib/strutil/xstrtol.c new file mode 100644 index 0000000..b755be3 --- /dev/null +++ b/lib/strutil/xstrtol.c @@ -0,0 +1,256 @@ +/* A more useful interface to strtol. + + Copyright (C) 1995-2022 + 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> + +#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; + + g_assert (0 <= base && base <= 36); + + 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; + + switch (**p) + { + case 'E': + case 'G': + case 'g': + case 'k': + case 'K': + case 'M': + case 'm': + case 'P': + case 'T': + case 't': + case 'Y': + case 'Z': + 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; + default: + break; + } + } + break; + default: + break; + } + + switch (**p) + { + case 'b': + overflow = bkm_scale (&tmp, 512); + break; + + case 'B': + /* This obsolescent first suffix is distinct from the 'B' + second suffix above. E.g., 'tar -L 1000B' means change + the tape after writing 1000 KiB of data. */ + overflow = bkm_scale (&tmp, 1024); + break; + + case 'c': + overflow = LONGINT_OK; + 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; +} + +/* --------------------------------------------------------------------------------------------- */ |