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Annotation of embedaddon/curl/docs/examples/sampleconv.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: /* <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: }