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1 | /* xmalloc.c -- safe versions of malloc and realloc */ |
2 | ||
3 | /* Copyright (C) 1991 Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of GNU Readline, a library for reading lines | |
6 | of text with interactive input and history editing. | |
7 | ||
8 | Readline is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU General Public License as published by the | |
10 | Free Software Foundation; either version 1, or (at your option) any | |
11 | later version. | |
12 | ||
13 | Readline is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with Readline; see the file COPYING. If not, write to the Free | |
20 | Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
21 | ||
22 | #if defined (HAVE_CONFIG_H) | |
23 | #include <config.h> | |
24 | #endif | |
25 | ||
26 | #include <sys/types.h> | |
27 | #include <stdio.h> | |
28 | ||
29 | #if defined (HAVE_UNISTD_H) | |
30 | # include <unistd.h> | |
31 | #endif | |
32 | ||
33 | #if defined (HAVE_STDLIB_H) | |
34 | # include <stdlib.h> | |
35 | #else | |
36 | # include "ansi_stdlib.h" | |
37 | #endif /* HAVE_STDLIB_H */ | |
38 | ||
39 | #include "error.h" | |
40 | ||
41 | #if !defined (PTR_T) | |
42 | # if defined (__STDC__) | |
43 | # define PTR_T void * | |
44 | # else | |
45 | # define PTR_T char * | |
46 | # endif /* !__STDC__ */ | |
47 | #endif /* !PTR_T */ | |
48 | ||
49 | #if !defined (SBRK_DECLARED) | |
50 | extern char *sbrk(); | |
51 | #endif | |
52 | ||
53 | static PTR_T lbreak; | |
54 | static int brkfound; | |
55 | static size_t allocated; | |
56 | ||
57 | /* **************************************************************** */ | |
58 | /* */ | |
59 | /* Memory Allocation and Deallocation. */ | |
60 | /* */ | |
61 | /* **************************************************************** */ | |
62 | ||
63 | /* Return a pointer to free()able block of memory large enough | |
64 | to hold BYTES number of bytes. If the memory cannot be allocated, | |
65 | print an error message and abort. */ | |
66 | char * | |
67 | xmalloc (bytes) | |
68 | size_t bytes; | |
69 | { | |
70 | char *temp; | |
71 | ||
72 | temp = (char *)malloc (bytes); | |
73 | ||
74 | if (temp == 0) | |
75 | { | |
76 | if (brkfound == 0) | |
77 | { | |
78 | lbreak = (PTR_T)sbrk (0); | |
79 | brkfound++; | |
80 | } | |
81 | allocated = (char *)sbrk (0) - (char *)lbreak; | |
82 | fatal_error ("xmalloc: cannot allocate %lu bytes (%lu bytes allocated)", (unsigned long)bytes, (unsigned long)allocated); | |
83 | } | |
84 | ||
85 | return (temp); | |
86 | } | |
87 | ||
88 | char * | |
89 | xrealloc (pointer, bytes) | |
90 | PTR_T pointer; | |
91 | size_t bytes; | |
92 | { | |
93 | char *temp; | |
94 | ||
95 | temp = pointer ? (char *)realloc (pointer, bytes) : (char *)malloc (bytes); | |
96 | ||
97 | if (temp == 0) | |
98 | { | |
99 | if (brkfound == 0) | |
100 | { | |
101 | lbreak = (PTR_T)sbrk (0); | |
102 | brkfound++; | |
103 | } | |
104 | allocated = (char *)sbrk (0) - (char *)lbreak; | |
105 | fatal_error ("xrealloc: cannot reallocate %lu bytes (%lu bytes allocated)", (unsigned long)bytes, (unsigned long)allocated); | |
106 | } | |
107 | ||
108 | return (temp); | |
109 | } | |
110 | ||
111 | /* Use this as the function to call when adding unwind protects so we | |
112 | don't need to know what free() returns. */ | |
113 | void | |
114 | xfree (string) | |
115 | char *string; | |
116 | { | |
117 | if (string) | |
118 | free (string); | |
119 | } |