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      1 /* $OpenBSD: xmalloc.c,v 1.33 2016/02/15 09:47:49 dtucker Exp $ */
      2 /*
      3  * Author: Tatu Ylonen <ylo (at) cs.hut.fi>
      4  * Copyright (c) 1995 Tatu Ylonen <ylo (at) 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 char *
     81 xstrdup(const char *str)
     82 {
     83 	size_t len;
     84 	char *cp;
     85 
     86 	len = strlen(str) + 1;
     87 	cp = xmalloc(len);
     88 	strlcpy(cp, str, len);
     89 	return cp;
     90 }
     91 
     92 int
     93 xasprintf(char **ret, const char *fmt, ...)
     94 {
     95 	va_list ap;
     96 	int i;
     97 
     98 	va_start(ap, fmt);
     99 	i = vasprintf(ret, fmt, ap);
    100 	va_end(ap);
    101 
    102 	if (i < 0 || *ret == NULL)
    103 		fatal("xasprintf: could not allocate memory");
    104 
    105 	return (i);
    106 }
    107