libexplain  1.4.D001
libexplain/realloc_on_error.c
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00001 /*
00002  * libexplain - Explain errno values returned by libc functions
00003  * Copyright (C) 2009, 2010, 2012, 2013 Peter Miller
00004  *
00005  * This program is free software; you can redistribute it and/or modify it
00006  * under the terms of the GNU Lesser General Public License as published by
00007  * the Free Software Foundation; either version 3 of the License, or (at
00008  * your option) any later version.
00009  *
00010  * This program is distributed in the hope that it will be useful,
00011  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00012  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013  * Lesser General Public License for more details.
00014  *
00015  * You should have received a copy of the GNU Lesser General Public License
00016  * along with this program. If not, see <http://www.gnu.org/licenses/>.
00017  */
00018 
00019 #include <libexplain/ac/errno.h>
00020 #include <libexplain/ac/stdlib.h>
00021 
00022 #include <libexplain/realloc.h>
00023 #include <libexplain/output.h>
00024 
00025 
00026 void *
00027 explain_realloc_on_error(void *ptr, size_t size)
00028 {
00029     int             hold_errno;
00030     size_t          ok_size;
00031     void            *result;
00032 
00033     /*
00034      * Common mis-implementations of the posix standard:
00035      * Some realloc implementations can't cope with a size of zero.
00036      * Some realloc implementations can't cope with a ptr of NULL.
00037      */
00038     hold_errno = errno;
00039     errno = 0;
00040     ok_size = size ? size : 1;
00041     result = ptr ? realloc(ptr, ok_size) : malloc(ok_size);
00042     if (!result)
00043     {
00044         hold_errno = errno;
00045         if (hold_errno == 0)
00046             hold_errno = ENOMEM;
00047         explain_output_error("%s", explain_errno_realloc(hold_errno, ptr,
00048             size));
00049     }
00050     errno = hold_errno;
00051     return result;
00052 }
00053 
00054 
00055 /* vim: set ts=8 sw=4 et : */