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-rw-r--r--lib/strutil/xstrtol.c268
1 files changed, 268 insertions, 0 deletions
diff --git a/lib/strutil/xstrtol.c b/lib/strutil/xstrtol.c
new file mode 100644
index 0000000..a0f93ce
--- /dev/null
+++ b/lib/strutil/xstrtol.c
@@ -0,0 +1,268 @@
+/* A more useful interface to strtol.
+
+ Copyright (C) 1995-2023
+ 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 ****************************************************************/
+
+/*** forward declarations (file scope functions) *************************************************/
+
+/*** 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 'Q':
+ case 'R':
+ 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 'Q': /* quetta or 2**100 */
+ overflow = bkm_scale_by_power (&tmp, base, 10);
+ break;
+
+ case 'R': /* ronna or 2**90 */
+ overflow = bkm_scale_by_power (&tmp, base, 9);
+ 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;
+}
+
+/* --------------------------------------------------------------------------------------------- */
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