1 /* $OpenBSD: xmalloc.c,v 1.3 2010/08/04 21:28:17 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 <err.h> 17 #include <limits.h> 18 #include <stdarg.h> 19 #include <stdio.h> 20 #include <stdlib.h> 21 #include <string.h> 22 23 #include "xmalloc.h" 24 25 void * 26 xmalloc(size_t size) 27 { 28 void *ptr; 29 30 if (size == 0) 31 errx(2, NULL); 32 ptr = malloc(size); 33 if (ptr == NULL) 34 errx(2, NULL); 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 errx(2, "xcalloc: zero size"); 45 if (SIZE_MAX / nmemb < size) 46 errx(2, "xcalloc: nmemb * size > SIZE_MAX"); 47 ptr = calloc(nmemb, size); 48 if (ptr == NULL) 49 errx(2, "xcalloc: out of memory (allocating %lu bytes)", 50 (u_long)(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 errx(2, NULL); 62 if (SIZE_MAX / nmemb < size) 63 errx(2, NULL); 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 errx(2, NULL); 70 return new_ptr; 71 } 72 73 void 74 xfree(void *ptr) 75 { 76 if (ptr == NULL) 77 errx(2, NULL); 78 free(ptr); 79 } 80 81 char * 82 xstrdup(const char *str) 83 { 84 size_t len; 85 char *cp; 86 87 len = strlen(str) + 1; 88 cp = xmalloc(len); 89 strlcpy(cp, str, len); 90 return cp; 91 } 92 93 int 94 xasprintf(char **ret, const char *fmt, ...) 95 { 96 va_list ap; 97 int i; 98 99 va_start(ap, fmt); 100 i = vasprintf(ret, fmt, ap); 101 va_end(ap); 102 103 if (i < 0 || *ret == NULL) 104 errx(2, NULL); 105 106 return (i); 107 } 108