File indexing completed on 2024-05-19 13:31:43

0001 // clang-format off
0002 /* xmalloc.c -- malloc with out of memory checking
0003 
0004    Modified for KDiff3 by Joachim Eibl 2003.
0005    The original file was part of GNU DIFF.
0006 
0007 
0008     Part of KDiff3 - Text Diff And Merge Tool
0009 
0010     SPDX-FileCopyrightText: 1988-2002 Free Software Foundation, Inc.
0011     SPDX-FileCopyrightText: 2002-2011 Joachim Eibl, joachim.eibl at gmx.de
0012     SPDX-FileCopyrightText: 2018-2020 Michael Reeves reeves.87@gmail.com
0013     SPDX-License-Identifier: GPL-2.0-or-later
0014 */
0015 // clang-format on
0016 
0017 #include <stdlib.h>
0018 #include <string.h>
0019 
0020 #ifndef EXIT_FAILURE
0021 #define EXIT_FAILURE 1
0022 #endif
0023 
0024 #include "gnudiff_diff.h"
0025 /* If non NULL, call this function when memory is exhausted. */
0026 void (*xalloc_fail_func)() = nullptr;
0027 
0028 void GnuDiff::xalloc_die()
0029 {
0030     if(xalloc_fail_func)
0031         (*xalloc_fail_func)();
0032     //error (exit_failure, 0, "%s", _(xalloc_msg_memory_exhausted));
0033     /* The `noreturn' cannot be given to error, since it may return if
0034      its first argument is 0.  To help compilers understand the
0035      xalloc_die does terminate, call exit. */
0036     exit(EXIT_FAILURE);
0037 }
0038 
0039 /* Allocate N bytes of memory dynamically, with error checking.  */
0040 
0041 void *
0042 GnuDiff::xmalloc(size_t n)
0043 {
0044     void *p;
0045 
0046     p = malloc(n == 0 ? 1 : n); // There are systems where malloc returns 0 for n==0.
0047     if(p == nullptr)
0048         xalloc_die();
0049     return p;
0050 }
0051 
0052 /* Change the size of an allocated block of memory P to N bytes,
0053    with error checking.  */
0054 
0055 void *
0056 GnuDiff::xrealloc(void *p, size_t n)
0057 {
0058     p = realloc(p, n == 0 ? 1 : n);
0059     if(p == nullptr)
0060         xalloc_die();
0061     return p;
0062 }
0063 
0064 /* Yield a new block of SIZE bytes, initialized to zero.  */
0065 
0066 void *
0067 GnuDiff::zalloc(size_t size)
0068 {
0069     void *p = xmalloc(size);
0070     memset(p, 0, size);
0071     return p;
0072 }