1 /* $OpenBSD: xmalloc.c,v 1.29 2014/01/04 17:50:55 tedu 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 <sys/param.h> 19 #include <stdarg.h> 20 #include <stdio.h> 21 #include <stdlib.h> 22 #include <string.h> 23 24 #include "xmalloc.h" 25 #include "log.h" 26 27 void * 28 xmalloc(size_t size) 29 { 30 void *ptr; 31 32 if (size == 0) 33 fatal("xmalloc: zero size"); 34 ptr = malloc(size); 35 if (ptr == NULL) 36 fatal("xmalloc: out of memory (allocating %zu bytes)", size); 37 return ptr; 38 } 39 40 void * 41 xcalloc(size_t nmemb, size_t size) 42 { 43 void *ptr; 44 45 if (size == 0 || nmemb == 0) 46 fatal("xcalloc: zero size"); 47 if (SIZE_T_MAX / nmemb < size) 48 fatal("xcalloc: nmemb * size > SIZE_T_MAX"); 49 ptr = calloc(nmemb, size); 50 if (ptr == NULL) 51 fatal("xcalloc: out of memory (allocating %zu bytes)", 52 size * nmemb); 53 return ptr; 54 } 55 56 void * 57 xrealloc(void *ptr, size_t nmemb, size_t size) 58 { 59 void *new_ptr; 60 size_t new_size = nmemb * size; 61 62 if (new_size == 0) 63 fatal("xrealloc: zero size"); 64 if (SIZE_T_MAX / nmemb < size) 65 fatal("xrealloc: nmemb * size > SIZE_T_MAX"); 66 if (ptr == NULL) 67 new_ptr = malloc(new_size); 68 else 69 new_ptr = realloc(ptr, new_size); 70 if (new_ptr == NULL) 71 fatal("xrealloc: out of memory (new_size %zu bytes)", 72 new_size); 73 return new_ptr; 74 } 75 76 char * 77 xstrdup(const char *str) 78 { 79 size_t len; 80 char *cp; 81 82 len = strlen(str) + 1; 83 cp = xmalloc(len); 84 strlcpy(cp, str, len); 85 return cp; 86 } 87 88 int 89 xasprintf(char **ret, const char *fmt, ...) 90 { 91 va_list ap; 92 int i; 93 94 va_start(ap, fmt); 95 i = vasprintf(ret, fmt, ap); 96 va_end(ap); 97 98 if (i < 0 || *ret == NULL) 99 fatal("xasprintf: could not allocate memory"); 100 101 return (i); 102 } 103