Mercurial > gnulib
view lib/calloc.c @ 40189:3ba41edecde6
progreloc: Speed up executable lookup on various platforms.
* lib/progreloc.c: Include <errno.h>.
(safe_read, full_read): New functions.
(find_executable): On GNU/kFreeBSD, FreeBSD, DragonFly, NetBSD, Solaris,
prefer the information from the /proc file system to a PATH search.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Tue, 19 Feb 2019 21:42:54 +0100 |
parents | b06060465f09 |
children |
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/* calloc() function that is glibc compatible. This wrapper function is required at least on Tru64 UNIX 5.1 and mingw. Copyright (C) 2004-2007, 2009-2019 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 Jim Meyering and Bruno Haible */ #include <config.h> /* Only the AC_FUNC_CALLOC macro defines 'calloc' already in config.h. */ #ifdef calloc # define NEED_CALLOC_GNU 1 # undef calloc /* Whereas the gnulib module 'calloc-gnu' defines HAVE_CALLOC_GNU. */ #elif GNULIB_CALLOC_GNU && !HAVE_CALLOC_GNU # define NEED_CALLOC_GNU 1 #endif /* Specification. */ #include <stdlib.h> #include <errno.h> /* Call the system's calloc below. */ #undef calloc /* Allocate and zero-fill an NxS-byte block of memory from the heap. If N or S is zero, allocate and zero-fill a 1-byte block. */ void * rpl_calloc (size_t n, size_t s) { void *result; #if NEED_CALLOC_GNU if (n == 0 || s == 0) { n = 1; s = 1; } else { /* Defend against buggy calloc implementations that mishandle size_t overflow. */ size_t bytes = n * s; if (bytes / s != n) { errno = ENOMEM; return NULL; } } #endif result = calloc (n, s); #if !HAVE_CALLOC_POSIX if (result == NULL) errno = ENOMEM; #endif return result; }