123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172 | /* getlimits - print various platform dependent limits. Copyright (C) 2008-2025 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/>. *//* Written by Pádraig Brady */#include <config.h>/* sets _FILE_OFFSET_BITS=64 etc. */#include <stdio.h>#include <sys/types.h>#include <float.h>#include"ftoastr.h"#include"system.h"#include"long-options.h"#define PROGRAM_NAME"getlimits"#define AUTHORS proper_name_lite ("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 0voidusage(int status){if(status != EXIT_SUCCESS)emit_try_help();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_ancillary_info(PROGRAM_NAME);}exit(status);}/* 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;}#define PRINT_FLOATTYPE(N, T, FTOASTR, BUFSIZE) \static void \N (T x) \{ \ char buf[BUFSIZE]; \ FTOASTR (buf, sizeof buf, FTOASTR_LEFT_JUSTIFY, 0, x); \ puts (buf); \}PRINT_FLOATTYPE(print_FLT,float, ftoastr, FLT_BUFSIZE_BOUND)PRINT_FLOATTYPE(print_DBL,double, dtoastr, DBL_BUFSIZE_BOUND)PRINT_FLOATTYPE(print_LDBL,long double, ldtoastr, LDBL_BUFSIZE_BOUND)intmain(int argc,char**argv){char limit[1+MAX(INT_BUFSIZE_BOUND(intmax_t),INT_BUFSIZE_BOUND(uintmax_t))];initialize_main(&argc, &argv);set_program_name(argv[0]);setlocale(LC_ALL,"");bindtextdomain(PACKAGE, LOCALEDIR);textdomain(PACKAGE);atexit(close_stdout);parse_gnu_standard_options_only(argc, argv, PROGRAM_NAME, PACKAGE_NAME, VERSION,true, usage, AUTHORS,(char const*)nullptr);#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)); \ if (TYPE##_MIN) \ { \ sprintf (limit + 1,"%jd", (intmax_t) TYPE##_MIN); \ printf (#TYPE"_MIN=%s\n", limit + 1); \ printf (#TYPE"_UFLOW=%s\n", decimal_absval_add_one (limit)); \ }#define print_float(TYPE) \ printf (#TYPE"_MIN="); print_##TYPE (TYPE##_MIN); \ printf (#TYPE"_MAX="); print_##TYPE (TYPE##_MAX);/* 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);/* Variable sized floats */print_float(FLT);print_float(DBL);print_float(LDBL);return EXIT_SUCCESS;}
|
