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/* Convert decimal strings with bounds checking and exit on error.
Copyright (C) 2014-2025 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 <https://www.gnu.org/licenses/>. */
#include <config.h>
#include "xdectoint.h"
#include <errno.h>
#include <inttypes.h>
#include <stdlib.h>
#include <error.h>
#include <quote.h>
#include <xstrtol.h>
/* Parse numeric string N_STR of base BASE, and return the value.
The value is between MIN and MAX.
Strings can have multiplicative SUFFIXES if specified.
On a parse error or out-of-range number, diagnose with N_STR and ERR, and
exit with status ERR_EXIT if nonzero, EXIT_FAILURE otherwise.
However, if FLAGS & XTOINT_MIN_QUIET, do not diagnose or exit
for too-low numbers; return MIN and set errno instead.
Similarly for XTOINT_MAX_QUIET and too-high numbers and MAX.
The errno value and diagnostic for out-of-range values depend on
whether FLAGS & XTOINT_MIN_RANGE and FLAGS & XTOINT_MAX_RANGE are set. */
__xdectoint_t
__xnumtoint (char const *n_str, int base, __xdectoint_t min, __xdectoint_t max,
char const *suffixes, char const *err, int err_exit,
int flags)
{
__xdectoint_t tnum, r;
strtol_error s_err = __xstrtol (n_str, nullptr, base, &tnum, suffixes);
/* Errno value to report if there is an overflow. */
int overflow_errno;
if (s_err != LONGINT_INVALID)
{
if (tnum < min)
{
r = min;
overflow_errno = flags & XTOINT_MIN_RANGE ? ERANGE : EOVERFLOW;
if (s_err == LONGINT_OK)
s_err = LONGINT_OVERFLOW;
}
else if (max < tnum)
{
r = max;
overflow_errno = flags & XTOINT_MAX_RANGE ? ERANGE : EOVERFLOW;
if (s_err == LONGINT_OK)
s_err = LONGINT_OVERFLOW;
}
else
{
r = tnum;
overflow_errno = EOVERFLOW;
}
}
int e = s_err == LONGINT_OVERFLOW ? overflow_errno : 0;
if (! (s_err == LONGINT_OK
|| (s_err == LONGINT_OVERFLOW
&& flags & (tnum < 0 ? XTOINT_MIN_QUIET : XTOINT_MAX_QUIET))))
error (err_exit ? err_exit : EXIT_FAILURE, e, "%s: %s", err, quote (n_str));
errno = e;
return r;
}
/* Parse decimal string N_STR, and return the value.
Exit on parse error or if MIN or MAX are exceeded.
Strings can have multiplicative SUFFIXES if specified.
ERR is printed along with N_STR on error. */
__xdectoint_t
__xdectoint (char const *n_str, __xdectoint_t min, __xdectoint_t max,
char const *suffixes, char const *err, int err_exit)
{
return __xnumtoint (n_str, 10, min, max, suffixes, err, err_exit, 0);
}
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