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1/* $OpenBSD: xmalloc.c,v 1.14 2019/06/28 05:44:09 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 <errno.h>
17#include <limits.h>
18#include <stdint.h>
19#include <stdio.h>
20#include <stdlib.h>
21#include <string.h>
22
23#include "log.h"
24#include "xmalloc.h"
25
26void *
27xmalloc(size_t size)
28{
29 void *ptr;
30
31 if (size == 0)
32 fatal("xmalloc: zero size");
33 ptr = malloc(size);
34 if (ptr == NULL)
35 fatal("xmalloc: allocating %zu bytes: %s",
36 size, strerror(errno));
37 return ptr;
38}
39
40void *
41xcalloc(size_t nmemb, size_t size)
42{
43 void *ptr;
44
45 if (size == 0 || nmemb == 0)
46 fatal("xcalloc: zero size");
47 ptr = calloc(nmemb, size);
48 if (ptr == NULL)
49 fatal("xcalloc: allocating %zu * %zu bytes: %s",
50 nmemb, size, strerror(errno));
51 return ptr;
52}
53
54void *
55xreallocarray(void *ptr, size_t nmemb, size_t size)
56{
57 void *new_ptr;
58
59 if (nmemb == 0 || size == 0)
60 fatal("xreallocarray: zero size");
61 new_ptr = reallocarray(ptr, nmemb, size);
62 if (new_ptr == NULL)
63 fatal("xreallocarray: allocating %zu * %zu bytes: %s",
64 nmemb, size, strerror(errno));
65 return new_ptr;
66}
67
68char *
69xstrdup(const char *str)
70{
71 char *cp;
72
73 if ((cp = strdup(str)) == NULL)
74 fatal("xstrdup: %s", strerror(errno));
75 return cp;
76}
77
78int
79xasprintf(char **ret, const char *fmt, ...)
80{
81 va_list ap;
82 int i;
83
84 va_start(ap, fmt);
85 i = vasprintf(ret, fmt, ap);
86 va_end(ap);
87
88 if (i == -1)
89 fatal("xasprintf: %s", strerror(errno));
90
91 return i;
92}
93
94int
95xsnprintf(char *str, size_t len, const char *fmt, ...)
96{
97 va_list ap;
98 int i;
99
100 if (len > INT_MAX)
101 fatal("xsnprintf: len > INT_MAX");
102
103 va_start(ap, fmt);
104 i = vsnprintf(str, len, fmt, ap);
105 va_end(ap);
106
107 if (i < 0 || i >= (int)len)
108 fatal("xsnprintf: overflow");
109
110 return i;
111}