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      1 /* $OpenBSD: xmalloc.c,v 1.31 2015/02/06 23:21:59 millert 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 xrealloc(void *ptr, size_t nmemb, size_t size)
     60 {
     61 	void *new_ptr;
     62 	size_t new_size = nmemb * size;
     63 
     64 	if (new_size == 0)
     65 		fatal("xrealloc: zero size");
     66 	if (SIZE_MAX / nmemb < size)
     67 		fatal("xrealloc: nmemb * size > SIZE_MAX");
     68 	if (ptr == NULL)
     69 		new_ptr = malloc(new_size);
     70 	else
     71 		new_ptr = realloc(ptr, new_size);
     72 	if (new_ptr == NULL)
     73 		fatal("xrealloc: out of memory (new_size %zu bytes)",
     74 		    new_size);
     75 	return new_ptr;
     76 }
     77 
     78 char *
     79 xstrdup(const char *str)
     80 {
     81 	size_t len;
     82 	char *cp;
     83 
     84 	len = strlen(str) + 1;
     85 	cp = xmalloc(len);
     86 	strlcpy(cp, str, len);
     87 	return cp;
     88 }
     89 
     90 int
     91 xasprintf(char **ret, const char *fmt, ...)
     92 {
     93 	va_list ap;
     94 	int i;
     95 
     96 	va_start(ap, fmt);
     97 	i = vasprintf(ret, fmt, ap);
     98 	va_end(ap);
     99 
    100 	if (i < 0 || *ret == NULL)
    101 		fatal("xasprintf: could not allocate memory");
    102 
    103 	return (i);
    104 }
    105