/***************************************************************************** * _ _ ____ _ * Project ___| | | | _ \| | * / __| | | | |_) | | * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * * $Id$ * * This is a very simple example using the multi interface and the debug * callback. */ #include <stdio.h> #include <string.h> /* somewhat unix-specific */ #include <sys/time.h> #include <unistd.h> /* curl stuff */ #include <curl/curl.h> typedef char bool; #define TRUE 1 static void dump(const char *text, FILE *stream, unsigned char *ptr, size_t size, bool nohex) { size_t i; size_t c; unsigned int width=0x10; if(nohex) /* without the hex output, we can fit more on screen */ width = 0x40; fprintf(stream, "%s, %zd bytes (0x%zx)\n", text, size, size); for(i=0; i<size; i+= width) { fprintf(stream, "%04zx: ", i); if(!nohex) { /* hex not disabled, show it */ for(c = 0; c < width; c++) if(i+c < size) fprintf(stream, "%02x ", ptr[i+c]); else fputs(" ", stream); } for(c = 0; (c < width) && (i+c < size); c++) { /* check for 0D0A; if found, skip past and start a new line of output */ if (nohex && (i+c+1 < size) && ptr[i+c]==0x0D && ptr[i+c+1]==0x0A) { i+=(c+2-width); break; } fprintf(stream, "%c", (ptr[i+c]>=0x20) && (ptr[i+c]<0x80)?ptr[i+c]:'.'); /* check again for 0D0A, to avoid an extra \n if it's at width */ if (nohex && (i+c+2 < size) && ptr[i+c+1]==0x0D && ptr[i+c+2]==0x0A) { i+=(c+3-width); break; } } fputc('\n', stream); /* newline */ } fflush(stream); } static int my_trace(CURL *handle, curl_infotype type, unsigned char *data, size_t size, void *userp) { const char *text; (void)handle; /* prevent compiler warning */ switch (type) { case CURLINFO_TEXT: fprintf(stderr, "== Info: %s", data); default: /* in case a new one is introduced to shock us */ return 0; case CURLINFO_HEADER_OUT: text = "=> Send header"; break; case CURLINFO_DATA_OUT: text = "=> Send data"; break; case CURLINFO_HEADER_IN: text = "<= Recv header"; break; case CURLINFO_DATA_IN: text = "<= Recv data"; break; } dump(text, stderr, data, size, TRUE); return 0; } /* * Simply download a HTTP file. */ int main(int argc, char **argv) { CURL *http_handle; CURLM *multi_handle; int still_running; /* keep number of running handles */ http_handle = curl_easy_init(); /* set the options (I left out a few, you'll get the point anyway) */ curl_easy_setopt(http_handle, CURLOPT_URL, "http://www.haxx.se/"); curl_easy_setopt(http_handle, CURLOPT_DEBUGFUNCTION, my_trace); curl_easy_setopt(http_handle, CURLOPT_VERBOSE, TRUE); /* init a multi stack */ multi_handle = curl_multi_init(); /* add the individual transfers */ curl_multi_add_handle(multi_handle, http_handle); /* we start some action by calling perform right away */ while(CURLM_CALL_MULTI_PERFORM == curl_multi_perform(multi_handle, &still_running)); while(still_running) { struct timeval timeout; int rc; /* select() return code */ fd_set fdread; fd_set fdwrite; fd_set fdexcep; int maxfd; FD_ZERO(&fdread); FD_ZERO(&fdwrite); FD_ZERO(&fdexcep); /* set a suitable timeout to play around with */ timeout.tv_sec = 1; timeout.tv_usec = 0; /* get file descriptors from the transfers */ curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd); /* In a real-world program you OF COURSE check the return code of the function calls, *and* you make sure that maxfd is bigger than -1 so that the call to select() below makes sense! */ rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout); switch(rc) { case -1: /* select error */ still_running = 0; printf("select() returns error, this is badness\n"); break; case 0: default: /* timeout or readable/writable sockets */ while(CURLM_CALL_MULTI_PERFORM == curl_multi_perform(multi_handle, &still_running)); break; } } curl_multi_cleanup(multi_handle); curl_easy_cleanup(http_handle); return 0; }