1/***************************************************************************
2 *                                  _   _ ____  _
3 *  Project                     ___| | | |  _ \| |
4 *                             / __| | | | |_) | |
5 *                            | (__| |_| |  _ <| |___
6 *                             \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 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.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 * SPDX-License-Identifier: curl
22 *
23 ***************************************************************************/
24/* <DESC>
25 * multi interface and debug callback
26 * </DESC>
27 */
28
29#include <stdio.h>
30#include <string.h>
31
32/* somewhat unix-specific */
33#include <sys/time.h>
34#include <unistd.h>
35
36/* curl stuff */
37#include <curl/curl.h>
38
39#define TRUE 1
40
41static void dump(const char *text, FILE *stream, unsigned char *ptr,
42                 size_t size, char nohex)
43{
44  size_t i;
45  size_t c;
46
47  unsigned int width = 0x10;
48
49  if(nohex)
50    /* without the hex output, we can fit more on screen */
51    width = 0x40;
52
53  fprintf(stream, "%s, %10.10lu bytes (0x%8.8lx)\n",
54          text, (unsigned long)size, (unsigned long)size);
55
56  for(i = 0; i<size; i += width) {
57
58    fprintf(stream, "%4.4lx: ", (unsigned long)i);
59
60    if(!nohex) {
61      /* hex not disabled, show it */
62      for(c = 0; c < width; c++)
63        if(i + c < size)
64          fprintf(stream, "%02x ", ptr[i + c]);
65        else
66          fputs("   ", stream);
67    }
68
69    for(c = 0; (c < width) && (i + c < size); c++) {
70      /* check for 0D0A; if found, skip past and start a new line of output */
71      if(nohex && (i + c + 1 < size) && ptr[i + c] == 0x0D &&
72         ptr[i + c + 1] == 0x0A) {
73        i += (c + 2 - width);
74        break;
75      }
76      fprintf(stream, "%c",
77              (ptr[i + c] >= 0x20) && (ptr[i + c]<0x80)?ptr[i + c]:'.');
78      /* check again for 0D0A, to avoid an extra \n if it's at width */
79      if(nohex && (i + c + 2 < size) && ptr[i + c + 1] == 0x0D &&
80         ptr[i + c + 2] == 0x0A) {
81        i += (c + 3 - width);
82        break;
83      }
84    }
85    fputc('\n', stream); /* newline */
86  }
87  fflush(stream);
88}
89
90static
91int my_trace(CURL *handle, curl_infotype type,
92             unsigned char *data, size_t size,
93             void *userp)
94{
95  const char *text;
96
97  (void)userp;
98  (void)handle; /* prevent compiler warning */
99
100  switch(type) {
101  case CURLINFO_TEXT:
102    fprintf(stderr, "== Info: %s", data);
103    return 0;
104  case CURLINFO_HEADER_OUT:
105    text = "=> Send header";
106    break;
107  case CURLINFO_DATA_OUT:
108    text = "=> Send data";
109    break;
110  case CURLINFO_HEADER_IN:
111    text = "<= Recv header";
112    break;
113  case CURLINFO_DATA_IN:
114    text = "<= Recv data";
115    break;
116  default: /* in case a new one is introduced to shock us */
117    return 0;
118  }
119
120  dump(text, stderr, data, size, TRUE);
121  return 0;
122}
123
124/*
125 * Simply download an HTTP file.
126 */
127int main(void)
128{
129  CURL *http_handle;
130  CURLM *multi_handle;
131
132  int still_running = 0; /* keep number of running handles */
133
134  http_handle = curl_easy_init();
135
136  /* set the options (I left out a few, you will get the point anyway) */
137  curl_easy_setopt(http_handle, CURLOPT_URL, "https://www.example.com/");
138
139  curl_easy_setopt(http_handle, CURLOPT_DEBUGFUNCTION, my_trace);
140  curl_easy_setopt(http_handle, CURLOPT_VERBOSE, 1L);
141
142  /* init a multi stack */
143  multi_handle = curl_multi_init();
144
145  /* add the individual transfers */
146  curl_multi_add_handle(multi_handle, http_handle);
147
148  do {
149    CURLMcode mc = curl_multi_perform(multi_handle, &still_running);
150
151    if(still_running)
152      /* wait for activity, timeout or "nothing" */
153      mc = curl_multi_poll(multi_handle, NULL, 0, 1000, NULL);
154
155    if(mc)
156      break;
157
158  } while(still_running);
159
160  curl_multi_cleanup(multi_handle);
161
162  curl_easy_cleanup(http_handle);
163
164  return 0;
165}
166