crypto/openssh/xmalloc.c

   1 /* $OpenBSD: xmalloc.c,v 1.34 2017/05/31 09:15:42 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 <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 void
  30 ssh_malloc_init(void)
  31 {
  32 #if defined(__OpenBSD__)
  33         extern char *malloc_options;
  34
  35         malloc_options = "S";
  36 #endif /* __OpenBSD__ */
  37 }
  38
  39 void *
  40 xmalloc(size_t size)
  41 {
  42         void *ptr;
  43
  44         if (size == 0)
  45                 fatal("xmalloc: zero size");
  46         ptr = malloc(size);
  47         if (ptr == NULL)
  48                 fatal("xmalloc: out of memory (allocating %zu bytes)", size);
  49         return ptr;
  50 }
  51
  52 void *
  53 xcalloc(size_t nmemb, size_t size)
  54 {
  55         void *ptr;
  56
  57         if (size == 0 || nmemb == 0)
  58                 fatal("xcalloc: zero size");
  59         if (SIZE_MAX / nmemb < size)
  60                 fatal("xcalloc: nmemb * size > SIZE_MAX");
  61         ptr = calloc(nmemb, size);
  62         if (ptr == NULL)
  63                 fatal("xcalloc: out of memory (allocating %zu bytes)",
  64                     size * nmemb);
  65         return ptr;
  66 }
  67
  68 void *
  69 xreallocarray(void *ptr, size_t nmemb, size_t size)
  70 {
  71         void *new_ptr;
  72
  73         new_ptr = reallocarray(ptr, nmemb, size);
  74         if (new_ptr == NULL)
  75                 fatal("xreallocarray: out of memory (%zu elements of %zu bytes)",
  76                     nmemb, size);
  77         return new_ptr;
  78 }
  79
  80 void *
  81 xrecallocarray(void *ptr, size_t onmemb, size_t nmemb, size_t size)
  82 {
  83         void *new_ptr;
  84
  85         new_ptr = recallocarray(ptr, onmemb, nmemb, size);
  86         if (new_ptr == NULL)
  87                 fatal("xrecallocarray: out of memory (%zu elements of %zu bytes)",
  88                     nmemb, size);
  89         return new_ptr;
  90 }
  91
  92 char *
  93 xstrdup(const char *str)
  94 {
  95         size_t len;
  96         char *cp;
  97
  98         len = strlen(str) + 1;
  99         cp = xmalloc(len);
 100         strlcpy(cp, str, len);
 101         return cp;
 102 }
 103
 104 int
 105 xasprintf(char **ret, const char *fmt, ...)
 106 {
 107         va_list ap;
 108         int i;
 109
 110         va_start(ap, fmt);
 111         i = vasprintf(ret, fmt, ap);
 112         va_end(ap);
 113
 114         if (i < 0 || *ret == NULL)
 115                 fatal("xasprintf: could not allocate memory");
 116
 117         return (i);
 118 }