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/* getlimits - print various platform dependent limits.
Copyright (C) 2023-2024 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/>. */
/* Based on 'getlimits' of GNU coreutils, written by Pádraig Brady.
* Stripped down to a minimal version by Bernhard Voelker. */
#include <config.h> /* sets _FILE_OFFSET_BITS=64 etc. */
#include <stdio.h>
#include <sys/types.h>
#include <stdlib.h>
#include <stdint.h>
#include "system.h"
#include "intprops.h"
#ifndef UID_T_MAX
# define UID_T_MAX TYPE_MAXIMUM (uid_t)
#endif
#ifndef GID_T_MAX
# define GID_T_MAX TYPE_MAXIMUM (gid_t)
#endif
#ifndef MIN
# define MIN(a,b) (a<b?a:b)
#endif
/* Add one to the absolute value of the number whose textual
representation is BUF + 1. Do this in-place, in the buffer.
Return a pointer to the result, which is normally BUF + 1, but is
BUF if the representation grew in size. */
static char const *
decimal_absval_add_one (char *buf)
{
bool negative = (buf[1] == '-');
char *absnum = buf + 1 + negative;
char *p = absnum + strlen (absnum);
absnum[-1] = '0';
while (*--p == '9')
*p = '0';
++*p;
char *result = MIN (absnum, p);
if (negative)
*--result = '-';
return result;
}
int
main (int argc, char **argv)
{
char limit[100];
#define print_int(TYPE) \
sprintf (limit + 1, "%" "ju", (uintmax_t) TYPE##_MAX); \
printf (#TYPE"_MAX=%s\n", limit + 1); \
printf (#TYPE"_OFLOW=%s\n", decimal_absval_add_one (limit))
print_int (INT);
print_int (UID_T);
print_int (GID_T);
return EXIT_SUCCESS;
}
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