1/* $OpenBSD: xmalloc.c,v 1.37 2022/03/13 23:27:54 cheloha 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 <stdarg.h>
19#ifdef HAVE_STDINT_H
20# include <stdint.h>
21#endif
22#include <stdio.h>
23#include <stdlib.h>
24#include <string.h>
25
26#include "xmalloc.h"
27#include "log.h"
28
29#if defined(__OpenBSD__)
30char *malloc_options = "S";
31#endif /* __OpenBSD__ */
32
33void *
34xmalloc(size_t size)
35{
36	void *ptr;
37
38	if (size == 0)
39		fatal("xmalloc: zero size");
40	ptr = malloc(size);
41	if (ptr == NULL)
42		fatal("xmalloc: out of memory (allocating %zu bytes)", size);
43	return ptr;
44}
45
46void *
47xcalloc(size_t nmemb, size_t size)
48{
49	void *ptr;
50
51	if (size == 0 || nmemb == 0)
52		fatal("xcalloc: zero size");
53	if (SIZE_MAX / nmemb < size)
54		fatal("xcalloc: nmemb * size > SIZE_MAX");
55	ptr = calloc(nmemb, size);
56	if (ptr == NULL)
57		fatal("xcalloc: out of memory (allocating %zu bytes)",
58		    size * nmemb);
59	return ptr;
60}
61
62void *
63xreallocarray(void *ptr, size_t nmemb, size_t size)
64{
65	void *new_ptr;
66
67	new_ptr = reallocarray(ptr, nmemb, size);
68	if (new_ptr == NULL)
69		fatal("xreallocarray: out of memory (%zu elements of %zu bytes)",
70		    nmemb, size);
71	return new_ptr;
72}
73
74void *
75xrecallocarray(void *ptr, size_t onmemb, size_t nmemb, size_t size)
76{
77	void *new_ptr;
78
79	new_ptr = recallocarray(ptr, onmemb, nmemb, size);
80	if (new_ptr == NULL)
81		fatal("xrecallocarray: out of memory (%zu elements of %zu bytes)",
82		    nmemb, size);
83	return new_ptr;
84}
85
86char *
87xstrdup(const char *str)
88{
89	size_t len;
90	char *cp;
91
92	len = strlen(str) + 1;
93	cp = xmalloc(len);
94	return memcpy(cp, str, len);
95}
96
97int
98xvasprintf(char **ret, const char *fmt, va_list ap)
99{
100	int i;
101
102	i = vasprintf(ret, fmt, ap);
103	if (i < 0 || *ret == NULL)
104		fatal("xvasprintf: could not allocate memory");
105	return i;
106}
107
108int
109xasprintf(char **ret, const char *fmt, ...)
110{
111	va_list ap;
112	int i;
113
114	va_start(ap, fmt);
115	i = xvasprintf(ret, fmt, ap);
116	va_end(ap);
117	return i;
118}
119