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Annotation of embedaddon/curl/docs/examples/debug.c, revision 1.1

1.1     ! misho       1: /***************************************************************************
        !             2:  *                                  _   _ ____  _
        !             3:  *  Project                     ___| | | |  _ \| |
        !             4:  *                             / __| | | | |_) | |
        !             5:  *                            | (__| |_| |  _ <| |___
        !             6:  *                             \___|\___/|_| \_\_____|
        !             7:  *
        !             8:  * Copyright (C) 1998 - 2018, 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:  * Show how CURLOPT_DEBUGFUNCTION can be used.
        !            24:  * </DESC>
        !            25:  */
        !            26: #include <stdio.h>
        !            27: #include <curl/curl.h>
        !            28: 
        !            29: struct data {
        !            30:   char trace_ascii; /* 1 or 0 */
        !            31: };
        !            32: 
        !            33: static
        !            34: void dump(const char *text,
        !            35:           FILE *stream, unsigned char *ptr, size_t size,
        !            36:           char nohex)
        !            37: {
        !            38:   size_t i;
        !            39:   size_t c;
        !            40: 
        !            41:   unsigned int width = 0x10;
        !            42: 
        !            43:   if(nohex)
        !            44:     /* without the hex output, we can fit more on screen */
        !            45:     width = 0x40;
        !            46: 
        !            47:   fprintf(stream, "%s, %10.10lu bytes (0x%8.8lx)\n",
        !            48:           text, (unsigned long)size, (unsigned long)size);
        !            49: 
        !            50:   for(i = 0; i<size; i += width) {
        !            51: 
        !            52:     fprintf(stream, "%4.4lx: ", (unsigned long)i);
        !            53: 
        !            54:     if(!nohex) {
        !            55:       /* hex not disabled, show it */
        !            56:       for(c = 0; c < width; c++)
        !            57:         if(i + c < size)
        !            58:           fprintf(stream, "%02x ", ptr[i + c]);
        !            59:         else
        !            60:           fputs("   ", stream);
        !            61:     }
        !            62: 
        !            63:     for(c = 0; (c < width) && (i + c < size); c++) {
        !            64:       /* check for 0D0A; if found, skip past and start a new line of output */
        !            65:       if(nohex && (i + c + 1 < size) && ptr[i + c] == 0x0D &&
        !            66:          ptr[i + c + 1] == 0x0A) {
        !            67:         i += (c + 2 - width);
        !            68:         break;
        !            69:       }
        !            70:       fprintf(stream, "%c",
        !            71:               (ptr[i + c] >= 0x20) && (ptr[i + c]<0x80)?ptr[i + c]:'.');
        !            72:       /* check again for 0D0A, to avoid an extra \n if it's at width */
        !            73:       if(nohex && (i + c + 2 < size) && ptr[i + c + 1] == 0x0D &&
        !            74:          ptr[i + c + 2] == 0x0A) {
        !            75:         i += (c + 3 - width);
        !            76:         break;
        !            77:       }
        !            78:     }
        !            79:     fputc('\n', stream); /* newline */
        !            80:   }
        !            81:   fflush(stream);
        !            82: }
        !            83: 
        !            84: static
        !            85: int my_trace(CURL *handle, curl_infotype type,
        !            86:              char *data, size_t size,
        !            87:              void *userp)
        !            88: {
        !            89:   struct data *config = (struct data *)userp;
        !            90:   const char *text;
        !            91:   (void)handle; /* prevent compiler warning */
        !            92: 
        !            93:   switch(type) {
        !            94:   case CURLINFO_TEXT:
        !            95:     fprintf(stderr, "== Info: %s", data);
        !            96:     /* FALLTHROUGH */
        !            97:   default: /* in case a new one is introduced to shock us */
        !            98:     return 0;
        !            99: 
        !           100:   case CURLINFO_HEADER_OUT:
        !           101:     text = "=> Send header";
        !           102:     break;
        !           103:   case CURLINFO_DATA_OUT:
        !           104:     text = "=> Send data";
        !           105:     break;
        !           106:   case CURLINFO_SSL_DATA_OUT:
        !           107:     text = "=> Send SSL data";
        !           108:     break;
        !           109:   case CURLINFO_HEADER_IN:
        !           110:     text = "<= Recv header";
        !           111:     break;
        !           112:   case CURLINFO_DATA_IN:
        !           113:     text = "<= Recv data";
        !           114:     break;
        !           115:   case CURLINFO_SSL_DATA_IN:
        !           116:     text = "<= Recv SSL data";
        !           117:     break;
        !           118:   }
        !           119: 
        !           120:   dump(text, stderr, (unsigned char *)data, size, config->trace_ascii);
        !           121:   return 0;
        !           122: }
        !           123: 
        !           124: int main(void)
        !           125: {
        !           126:   CURL *curl;
        !           127:   CURLcode res;
        !           128:   struct data config;
        !           129: 
        !           130:   config.trace_ascii = 1; /* enable ascii tracing */
        !           131: 
        !           132:   curl = curl_easy_init();
        !           133:   if(curl) {
        !           134:     curl_easy_setopt(curl, CURLOPT_DEBUGFUNCTION, my_trace);
        !           135:     curl_easy_setopt(curl, CURLOPT_DEBUGDATA, &config);
        !           136: 
        !           137:     /* the DEBUGFUNCTION has no effect until we enable VERBOSE */
        !           138:     curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
        !           139: 
        !           140:     /* example.com is redirected, so we tell libcurl to follow redirection */
        !           141:     curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
        !           142: 
        !           143:     curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
        !           144:     res = curl_easy_perform(curl);
        !           145:     /* Check for errors */
        !           146:     if(res != CURLE_OK)
        !           147:       fprintf(stderr, "curl_easy_perform() failed: %s\n",
        !           148:               curl_easy_strerror(res));
        !           149: 
        !           150:     /* always cleanup */
        !           151:     curl_easy_cleanup(curl);
        !           152:   }
        !           153:   return 0;
        !           154: }