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Annotation of embedaddon/curl/lib/strdup.c, revision 1.1

1.1     ! misho       1: /***************************************************************************
        !             2:  *                                  _   _ ____  _
        !             3:  *  Project                     ___| | | |  _ \| |
        !             4:  *                             / __| | | | |_) | |
        !             5:  *                            | (__| |_| |  _ <| |___
        !             6:  *                             \___|\___/|_| \_\_____|
        !             7:  *
        !             8:  * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@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: }