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733bb9a054
Run 'make update-copyright'. * lib/regexprops.c (copying): Update the year number manually. * tests/sample-test: Adjust to use the single most recent year. * All other files: Update copyright years via the above make run.
82 lines
2.3 KiB
C
82 lines
2.3 KiB
C
/* getlimits - print various platform dependent limits.
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Copyright (C) 2023-2026 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Based on 'getlimits' of GNU coreutils, written by Pádraig Brady.
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* Stripped down to a minimal version by Bernhard Voelker. */
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#include <config.h> /* sets _FILE_OFFSET_BITS=64 etc. */
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#include <stdio.h>
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#include <sys/types.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include "system.h"
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#include "intprops.h"
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#ifndef UID_T_MAX
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# define UID_T_MAX TYPE_MAXIMUM (uid_t)
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#endif
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#ifndef GID_T_MAX
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# define GID_T_MAX TYPE_MAXIMUM (gid_t)
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#endif
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#ifndef MIN
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# define MIN(a,b) (a<b?a:b)
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#endif
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/* Silence GCC 14. */
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#if 14 <= __GNUC__
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# pragma GCC diagnostic ignored "-Wanalyzer-out-of-bounds"
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#endif
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/* Add one to the absolute value of the number whose textual
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representation is BUF + 1. Do this in-place, in the buffer.
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Return a pointer to the result, which is normally BUF + 1, but is
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BUF if the representation grew in size. */
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static char const *
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decimal_absval_add_one (char *buf)
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{
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bool negative = (buf[1] == '-');
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char *absnum = buf + 1 + negative;
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char *p = absnum + strlen (absnum);
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absnum[-1] = '0';
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while (*--p == '9')
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*p = '0';
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++*p;
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char *result = MIN (absnum, p);
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if (negative)
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*--result = '-';
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return result;
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}
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int
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main (int argc, char **argv)
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{
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char limit[100];
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#define print_int(TYPE) \
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sprintf (limit + 1, "%" "ju", (uintmax_t) TYPE##_MAX); \
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printf (#TYPE"_MAX=%s\n", limit + 1); \
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printf (#TYPE"_OFLOW=%s\n", decimal_absval_add_one (limit))
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print_int (INT);
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print_int (UID_T);
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print_int (GID_T);
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return EXIT_SUCCESS;
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}
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