mongoose/examples/http_client/http_client.c

/*
 * Copyright (c) 2014 Cesanta Software Limited
 * All rights reserved
 *
 * This program fetches HTTP URLs.
 */

#include "mongoose.h"

static int s_exit_flag = 0;
static int s_show_headers = 0;
static const char *s_show_headers_opt = "--show-headers";

static void ev_handler(struct mg_connection *nc, int ev, void *ev_data) {
  struct http_message *hm = (struct http_message *) ev_data;

  switch (ev) {
    case MG_EV_CONNECT:
      if (*(int *) ev_data != 0) {
        fprintf(stderr, "connect() failed: %s\n", strerror(*(int *) ev_data));
        s_exit_flag = 1;
      }
      break;
    case MG_EV_HTTP_REPLY:
      nc->flags |= MG_F_CLOSE_IMMEDIATELY;
      if (s_show_headers) {
        fwrite(hm->message.p, 1, hm->message.len, stdout);
      } else {
        fwrite(hm->body.p, 1, hm->body.len, stdout);
      }
      putchar('\n');
      s_exit_flag = 1;
      break;
    default:
      break;
  }
}

int main(int argc, char *argv[]) {
  struct mg_mgr mgr;
  int i;

  mg_mgr_init(&mgr, NULL);

  /* Process command line arguments */
  for (i = 1; i < argc; i++) {
    if (strcmp(argv[i], s_show_headers_opt) == 0) {
      s_show_headers = 1;
    } else if (strcmp(argv[i], "--hexdump") == 0 && i + 1 < argc) {
      mgr.hexdump_file = argv[++i];
    } else {
      break;
    }
  }

  if (i + 1 != argc) {
    fprintf(stderr, "Usage: %s [%s] [--hexdump <file>] <URL>\n", argv[0],
            s_show_headers_opt);
    exit(EXIT_FAILURE);
  }

  mg_connect_http(&mgr, ev_handler, argv[i], NULL, NULL);

  while (s_exit_flag == 0) {
    mg_mgr_poll(&mgr, 1000);
  }
  mg_mgr_free(&mgr);

  return 0;
}