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 <sys/param.h> 17 #include <stdarg.h> 18 #include <stdio.h> 19 #include <stdlib.h> 20 #include <string.h> 21 22 #include "xmalloc.h" 23 #include "log.h" 24 25 void * 26 xmalloc(size_t size) 27 { 28 void *ptr; 29 30 if (size == 0) 31 fatal("xmalloc: zero size"); 32 ptr = malloc(size); 33 if (ptr == NULL) 34 fatal("xmalloc: out of memory (allocating %zu bytes)", size); 35 return ptr; 36 } 37 38 void * 39 xcalloc(size_t nmemb, size_t size) 40 { 41 void *ptr; 42 43 if (size == 0 || nmemb == 0) 44 fatal("xcalloc: zero size"); 45 if (SIZE_T_MAX / nmemb < size) 46 fatal("xcalloc: nmemb * size > SIZE_T_MAX"); 47 ptr = calloc(nmemb, size); 48 if (ptr == NULL) 49 fatal("xcalloc: out of memory (allocating %zu bytes)", 50 size * nmemb); 51 return ptr; 52 } 53 54 void * 55 xrealloc(void *ptr, size_t nmemb, size_t size) 56 { 57 void *new_ptr; 58 size_t new_size = nmemb * size; 59 60 if (new_size == 0) 61 fatal("xrealloc: zero size"); 62 if (SIZE_T_MAX / nmemb < size) 63 fatal("xrealloc: nmemb * size > SIZE_T_MAX"); 64 if (ptr == NULL) 65 new_ptr = malloc(new_size); 66 else 67 new_ptr = realloc(ptr, new_size); 68 if (new_ptr == NULL) 69 fatal("xrealloc: out of memory (new_size %zu bytes)", 70 new_size); 71 return new_ptr; 72 } 73 74 char * 75 xstrdup(const char *str) 76 { 77 size_t len; 78 char *cp; 79 80 len = strlen(str) + 1; 81 cp = xmalloc(len); 82 strlcpy(cp, str, len); 83 return cp; 84 } 85 86 int 87 xasprintf(char **ret, const char *fmt, ...) 88 { 89 va_list ap; 90 int i; 91 92 va_start(ap, fmt); 93 i = vasprintf(ret, fmt, ap); 94 va_end(ap); 95 96 if (i < 0 || *ret == NULL) 97 fatal("xasprintf: could not allocate memory"); 98 99 return (i); 100 } 101