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1 | /* $OpenBSD: xmalloc.c,v 1.27 2006/08/03 03:34:42 deraadt Exp $ */ | |
2 | /* | |
3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
5 | * All rights reserved | |
6 | * Versions of malloc and friends that check their results, and never return | |
7 | * failure (they call fatal if they encounter an error). | |
8 | * | |
9 | * As far as I am concerned, the code I have written for this software | |
10 | * can be used freely for any purpose. Any derived versions of this | |
11 | * software must be clearly marked as such, and if the derived work is | |
12 | * incompatible with the protocol description in the RFC file, it must be | |
13 | * called by a name other than "ssh" or "Secure Shell". | |
14 | */ | |
15 | ||
16 | #include "includes.h" | |
17 | ||
18 | #include <sys/param.h> | |
19 | #include <stdarg.h> | |
20 | #include <stdio.h> | |
21 | #include <stdlib.h> | |
22 | #include <string.h> | |
23 | ||
24 | #include "xmalloc.h" | |
25 | #include "log.h" | |
26 | ||
27 | void * | |
28 | xmalloc(size_t size) | |
29 | { | |
30 | void *ptr; | |
31 | ||
32 | if (size == 0) | |
33 | fatal("xmalloc: zero size"); | |
34 | ptr = malloc(size); | |
35 | if (ptr == NULL) | |
36 | fatal("xmalloc: out of memory (allocating %lu bytes)", (u_long) size); | |
37 | return ptr; | |
38 | } | |
39 | ||
40 | void * | |
41 | xcalloc(size_t nmemb, size_t size) | |
42 | { | |
43 | void *ptr; | |
44 | ||
45 | if (size == 0 || nmemb == 0) | |
46 | fatal("xcalloc: zero size"); | |
47 | if (SIZE_T_MAX / nmemb < size) | |
48 | fatal("xcalloc: nmemb * size > SIZE_T_MAX"); | |
49 | ptr = calloc(nmemb, size); | |
50 | if (ptr == NULL) | |
51 | fatal("xcalloc: out of memory (allocating %lu bytes)", | |
52 | (u_long)(size * nmemb)); | |
53 | return ptr; | |
54 | } | |
55 | ||
56 | void * | |
57 | xrealloc(void *ptr, size_t nmemb, size_t size) | |
58 | { | |
59 | void *new_ptr; | |
60 | size_t new_size = nmemb * size; | |
61 | ||
62 | if (new_size == 0) | |
63 | fatal("xrealloc: zero size"); | |
64 | if (SIZE_T_MAX / nmemb < size) | |
65 | fatal("xrealloc: nmemb * size > SIZE_T_MAX"); | |
66 | if (ptr == NULL) | |
67 | new_ptr = malloc(new_size); | |
68 | else | |
69 | new_ptr = realloc(ptr, new_size); | |
70 | if (new_ptr == NULL) | |
71 | fatal("xrealloc: out of memory (new_size %lu bytes)", | |
72 | (u_long) new_size); | |
73 | return new_ptr; | |
74 | } | |
75 | ||
76 | void | |
77 | xfree(void *ptr) | |
78 | { | |
79 | if (ptr == NULL) | |
80 | fatal("xfree: NULL pointer given as argument"); | |
81 | free(ptr); | |
82 | } | |
83 | ||
84 | char * | |
85 | xstrdup(const char *str) | |
86 | { | |
87 | size_t len; | |
88 | char *cp; | |
89 | ||
90 | len = strlen(str) + 1; | |
91 | cp = xmalloc(len); | |
92 | strlcpy(cp, str, len); | |
93 | return cp; | |
94 | } | |
95 | ||
96 | int | |
97 | xasprintf(char **ret, const char *fmt, ...) | |
98 | { | |
99 | va_list ap; | |
100 | int i; | |
101 | ||
102 | va_start(ap, fmt); | |
103 | i = vasprintf(ret, fmt, ap); | |
104 | va_end(ap); | |
105 | ||
106 | if (i < 0 || *ret == NULL) | |
107 | fatal("xasprintf: could not allocate memory"); | |
108 | ||
109 | return (i); | |
110 | } |