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      1 /* $OpenBSD: xmalloc.c,v 1.32 2015/04/24 01:36:01 deraadt 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 xmalloc(size_t size)
     31 {
     32 	void *ptr;
     33 
     34 	if (size == 0)
     35 		fatal("xmalloc: zero size");
     36 	ptr = malloc(size);
     37 	if (ptr == NULL)
     38 		fatal("xmalloc: out of memory (allocating %zu bytes)", size);
     39 	return ptr;
     40 }
     41 
     42 void *
     43 xcalloc(size_t nmemb, size_t size)
     44 {
     45 	void *ptr;
     46 
     47 	if (size == 0 || nmemb == 0)
     48 		fatal("xcalloc: zero size");
     49 	if (SIZE_MAX / nmemb < size)
     50 		fatal("xcalloc: nmemb * size > SIZE_MAX");
     51 	ptr = calloc(nmemb, size);
     52 	if (ptr == NULL)
     53 		fatal("xcalloc: out of memory (allocating %zu bytes)",
     54 		    size * nmemb);
     55 	return ptr;
     56 }
     57 
     58 void *
     59 xreallocarray(void *ptr, size_t nmemb, size_t size)
     60 {
     61 	void *new_ptr;
     62 
     63 	new_ptr = reallocarray(ptr, nmemb, size);
     64 	if (new_ptr == NULL)
     65 		fatal("xreallocarray: out of memory (%zu elements of %zu bytes)",
     66 		    nmemb, size);
     67 	return new_ptr;
     68 }
     69 
     70 char *
     71 xstrdup(const char *str)
     72 {
     73 	size_t len;
     74 	char *cp;
     75 
     76 	len = strlen(str) + 1;
     77 	cp = xmalloc(len);
     78 	strlcpy(cp, str, len);
     79 	return cp;
     80 }
     81 
     82 int
     83 xasprintf(char **ret, const char *fmt, ...)
     84 {
     85 	va_list ap;
     86 	int i;
     87 
     88 	va_start(ap, fmt);
     89 	i = vasprintf(ret, fmt, ap);
     90 	va_end(ap);
     91 
     92 	if (i < 0 || *ret == NULL)
     93 		fatal("xasprintf: could not allocate memory");
     94 
     95 	return (i);
     96 }
     97