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Annotation of embedaddon/curl/docs/examples/sampleconv.c, revision 1.1.1.1

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: /* <DESC>
                     23:  * This is a simple example showing how a program on a non-ASCII platform
                     24:  * would invoke callbacks to do its own codeset conversions instead of
                     25:  * using the built-in iconv functions in libcurl.
                     26:  * </DESC>
                     27:  */
                     28: /*
                     29: 
                     30:    The IBM-1047 EBCDIC codeset is used for this example but the code
                     31:    would be similar for other non-ASCII codesets.
                     32: 
                     33:    Three callback functions are created below:
                     34:         my_conv_from_ascii_to_ebcdic,
                     35:         my_conv_from_ebcdic_to_ascii, and
                     36:         my_conv_from_utf8_to_ebcdic
                     37: 
                     38:    The "platform_xxx" calls represent platform-specific conversion routines.
                     39: 
                     40:  */
                     41: 
                     42: #include <stdio.h>
                     43: #include <curl/curl.h>
                     44: 
                     45: static CURLcode my_conv_from_ascii_to_ebcdic(char *buffer, size_t length)
                     46: {
                     47:   char *tempptrin, *tempptrout;
                     48:   size_t bytes = length;
                     49:   int rc;
                     50:   tempptrin = tempptrout = buffer;
                     51:   rc = platform_a2e(&tempptrin, &bytes, &tempptrout, &bytes);
                     52:   if(rc == PLATFORM_CONV_OK) {
                     53:     return CURLE_OK;
                     54:   }
                     55:   else {
                     56:     return CURLE_CONV_FAILED;
                     57:   }
                     58: }
                     59: 
                     60: static CURLcode my_conv_from_ebcdic_to_ascii(char *buffer, size_t length)
                     61: {
                     62:   char *tempptrin, *tempptrout;
                     63:   size_t bytes = length;
                     64:   int rc;
                     65:   tempptrin = tempptrout = buffer;
                     66:   rc = platform_e2a(&tempptrin, &bytes, &tempptrout, &bytes);
                     67:   if(rc == PLATFORM_CONV_OK) {
                     68:     return CURLE_OK;
                     69:   }
                     70:   else {
                     71:     return CURLE_CONV_FAILED;
                     72:   }
                     73: }
                     74: 
                     75: static CURLcode my_conv_from_utf8_to_ebcdic(char *buffer, size_t length)
                     76: {
                     77:   char *tempptrin, *tempptrout;
                     78:   size_t bytes = length;
                     79:   int rc;
                     80:   tempptrin = tempptrout = buffer;
                     81:   rc = platform_u2e(&tempptrin, &bytes, &tempptrout, &bytes);
                     82:   if(rc == PLATFORM_CONV_OK) {
                     83:     return CURLE_OK;
                     84:   }
                     85:   else {
                     86:     return CURLE_CONV_FAILED;
                     87:   }
                     88: }
                     89: 
                     90: int main(void)
                     91: {
                     92:   CURL *curl;
                     93: 
                     94:   curl = curl_easy_init();
                     95:   if(curl) {
                     96:     curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
                     97: 
                     98:     /* use platform-specific functions for codeset conversions */
                     99:     curl_easy_setopt(curl, CURLOPT_CONV_FROM_NETWORK_FUNCTION,
                    100:                      my_conv_from_ascii_to_ebcdic);
                    101:     curl_easy_setopt(curl, CURLOPT_CONV_TO_NETWORK_FUNCTION,
                    102:                      my_conv_from_ebcdic_to_ascii);
                    103:     curl_easy_setopt(curl, CURLOPT_CONV_FROM_UTF8_FUNCTION,
                    104:                      my_conv_from_utf8_to_ebcdic);
                    105: 
                    106:     curl_easy_perform(curl);
                    107: 
                    108:     /* always cleanup */
                    109:     curl_easy_cleanup(curl);
                    110:   }
                    111:   return 0;
                    112: }