1 /* $OpenBSD: xmalloc.c,v 1.6 2006/03/28 02:13:44 ray 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 "xmalloc.h" 19 #include "log.h" 20 21 void * 22 xmalloc(size_t size) 23 { 24 void *ptr; 25 26 if (size == 0) 27 fatal("xmalloc: zero size"); 28 ptr = malloc(size); 29 if (ptr == NULL) 30 fatal("xmalloc: out of memory (allocating %lu bytes)", (u_long) size); 31 return ptr; 32 } 33 34 void * 35 xcalloc(size_t nmemb, size_t size) 36 { 37 void *ptr; 38 39 if (size == 0 || nmemb == 0) 40 fatal("xcalloc: zero size"); 41 if (SIZE_T_MAX / nmemb < size) 42 fatal("xcalloc: nmemb * size > SIZE_T_MAX"); 43 ptr = calloc(nmemb, size); 44 if (ptr == NULL) 45 fatal("xcalloc: out of memory (allocating %lu bytes)", 46 (u_long)(size * nmemb)); 47 return ptr; 48 } 49 50 void * 51 xrealloc(void *ptr, size_t nmemb, size_t size) 52 { 53 void *new_ptr; 54 size_t new_size = nmemb * size; 55 56 if (new_size == 0) 57 fatal("xrealloc: zero size"); 58 if (SIZE_T_MAX / nmemb < size) 59 fatal("xrealloc: nmemb * size > SIZE_T_MAX"); 60 if (ptr == NULL) 61 new_ptr = malloc(new_size); 62 else 63 new_ptr = realloc(ptr, new_size); 64 if (new_ptr == NULL) 65 fatal("xrealloc: out of memory (new_size %lu bytes)", 66 (u_long) new_size); 67 return new_ptr; 68 } 69 70 void 71 xfree(void *ptr) 72 { 73 if (ptr == NULL) 74 fatal("xfree: NULL pointer given as argument"); 75 free(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