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/* getlimits - print various platform dependent limits.
Copyright (C) 2008-2009 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 Pádraig Brady */
#include <config.h> /* sets _FILE_OFFSET_BITS=64 etc. */
#include <stdio.h>
#include <sys/types.h>
#include "system.h"
#include "c-ctype.h"
#include "long-options.h"
#define PROGRAM_NAME "getlimits"
#define AUTHORS proper_name_utf8 ("Padraig Brady", "P\303\241draig Brady")
#ifndef TIME_T_MAX
# define TIME_T_MAX TYPE_MAXIMUM (time_t)
#endif
#ifndef TIME_T_MIN
# define TIME_T_MIN TYPE_MINIMUM (time_t)
#endif
#ifndef SSIZE_MIN
# define SSIZE_MIN TYPE_MINIMUM (ssize_t)
#endif
#ifndef PID_T_MIN
# define PID_T_MIN TYPE_MINIMUM (pid_t)
#endif
/* These are not interesting to print.
* Instead of these defines it would be nice to be able to do
* #ifdef (TYPE##_MIN) in function macro below. */
#define SIZE_MIN 0
#define UCHAR_MIN 0
#define UINT_MIN 0
#define ULONG_MIN 0
#define UINTMAX_MIN 0
#define UID_T_MIN 0
#define GID_T_MIN 0
void
usage (int status)
{
if (status != EXIT_SUCCESS)
fprintf (stderr, _("Try `%s --help' for more information.\n"),
program_name);
else
{
printf (_("\
Usage: %s\n\
"), program_name);
fputs (_("\
Output platform dependent limits in a format useful for shell scripts.\n\
\n\
"), stdout);
fputs (HELP_OPTION_DESCRIPTION, stdout);
fputs (VERSION_OPTION_DESCRIPTION, stdout);
emit_bug_reporting_address ();
}
exit (status);
}
/* Add absolute values of ascii decimal strings.
* Strings can have leading spaces.
* If any string has a '-' it's preserved in the output:
* I.E.
* 1 + 1 -> 2
* -1 + -1 -> -2
* -1 + 1 -> -2
* 1 + -1 -> -2
*/
static char *
decimal_ascii_add (const char *str1, const char *str2)
{
int len1 = strlen (str1);
int len2 = strlen (str2);
int rlen = MAX (len1, len2) + 3; /* space for extra digit or sign + NUL */
char *result = xmalloc (rlen);
char *rp = result + rlen - 1;
const char *d1 = str1 + len1 - 1;
const char *d2 = str2 + len2 - 1;
int carry = 0;
*rp = '\0';
while (1)
{
char c1 = (d1 < str1 ? ' ' : (*d1 == '-' ? ' ' : *d1--));
char c2 = (d2 < str2 ? ' ' : (*d2 == '-' ? ' ' : *d2--));
char t1 = c1 + c2 + carry; /* ASCII digits are BCD */
if (!c_isdigit (c1) && !c_isdigit (c2) && !carry)
break;
carry = t1 > '0' + '9' || t1 == ' ' + '9' + 1;
t1 += 6 * carry;
*--rp = (t1 & 0x0F) | 0x30; /* top nibble to ASCII */
}
if ((d1 >= str1 && *d1 == '-') || (d2 >= str2 && (*d2 == '-')))
*--rp = '-';
if (rp != result)
memmove (result, rp, rlen - (rp - result));
return result;
}
int
main (int argc, char **argv)
{
char limit[64]; /* big enough for 128 bit at least */
char *oflow;
initialize_main (&argc, &argv);
set_program_name (argv[0]);
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
initialize_exit_failure (EXIT_FAILURE);
atexit (close_stdout);
parse_long_options (argc, argv, PROGRAM_NAME, PACKAGE_NAME, VERSION,
usage, AUTHORS, (char const *) NULL);
#define print_int(TYPE) \
snprintf (limit, sizeof(limit), "%"PRIuMAX, (uintmax_t)TYPE##_MAX); \
printf (#TYPE"_MAX=%s\n", limit); \
oflow = decimal_ascii_add (limit, "1"); \
printf (#TYPE"_OFLOW=%s\n", oflow); \
free (oflow); \
if (TYPE##_MIN) \
{ \
snprintf (limit, sizeof(limit), "%"PRIdMAX, (intmax_t)TYPE##_MIN); \
printf (#TYPE"_MIN=%s\n", limit); \
oflow = decimal_ascii_add (limit, "-1"); \
printf (#TYPE"_UFLOW=%s\n", oflow); \
free (oflow); \
}
/* Variable sized ints */
print_int (CHAR);
print_int (SCHAR);
print_int (UCHAR);
print_int (SHRT);
print_int (INT);
print_int (UINT);
print_int (LONG);
print_int (ULONG);
print_int (SIZE);
print_int (SSIZE);
print_int (TIME_T);
print_int (UID_T);
print_int (GID_T);
print_int (PID_T);
print_int (OFF_T);
print_int (INTMAX);
print_int (UINTMAX);
}
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