1 /*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel (at) haxx.se>, et al. 9 * 10 * This software is licensed as described in the file COPYING, which 11 * you should have received as part of this distribution. The terms 12 * are also available at https://curl.haxx.se/docs/copyright.html. 13 * 14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell 15 * copies of the Software, and permit persons to whom the Software is 16 * furnished to do so, under the terms of the COPYING file. 17 * 18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY 19 * KIND, either express or implied. 20 * 21 ***************************************************************************/ 22 23 #include "curl_setup.h" 24 25 #include <curl/curl.h> 26 27 #include "strdup.h" 28 #include "curl_memory.h" 29 30 /* The last #include file should be: */ 31 #include "memdebug.h" 32 33 #ifndef HAVE_STRDUP 34 char *curlx_strdup(const char *str) 35 { 36 size_t len; 37 char *newstr; 38 39 if(!str) 40 return (char *)NULL; 41 42 len = strlen(str); 43 44 if(len >= ((size_t)-1) / sizeof(char)) 45 return (char *)NULL; 46 47 newstr = malloc((len + 1)*sizeof(char)); 48 if(!newstr) 49 return (char *)NULL; 50 51 memcpy(newstr, str, (len + 1)*sizeof(char)); 52 53 return newstr; 54 55 } 56 #endif 57 58 /*************************************************************************** 59 * 60 * Curl_memdup(source, length) 61 * 62 * Copies the 'source' data to a newly allocated buffer (that is 63 * returned). Copies 'length' bytes. 64 * 65 * Returns the new pointer or NULL on failure. 66 * 67 ***************************************************************************/ 68 void *Curl_memdup(const void *src, size_t length) 69 { 70 void *buffer = malloc(length); 71 if(!buffer) 72 return NULL; /* fail */ 73 74 memcpy(buffer, src, length); 75 76 return buffer; 77 } 78 79 /*************************************************************************** 80 * 81 * Curl_saferealloc(ptr, size) 82 * 83 * Does a normal realloc(), but will free the data pointer if the realloc 84 * fails. If 'size' is non-zero, it will free the data and return a failure. 85 * 86 * This convenience function is provided and used to help us avoid a common 87 * mistake pattern when we could pass in a zero, catch the NULL return and end 88 * up free'ing the memory twice. 89 * 90 * Returns the new pointer or NULL on failure. 91 * 92 ***************************************************************************/ 93 void *Curl_saferealloc(void *ptr, size_t size) 94 { 95 void *datap = realloc(ptr, size); 96 if(size && !datap) 97 /* only free 'ptr' if size was non-zero */ 98 free(ptr); 99 return datap; 100 } 101