diff options
| -rw-r--r-- | docs/examples/post-callback.c | 55 |
1 files changed, 32 insertions, 23 deletions
diff --git a/docs/examples/post-callback.c b/docs/examples/post-callback.c index dbf249140..4dbe18e24 100644 --- a/docs/examples/post-callback.c +++ b/docs/examples/post-callback.c @@ -5,7 +5,7 @@ * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * - * Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al. + * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al. * * This software is licensed as described in the file COPYING, which * you should have received as part of this distribution. The terms @@ -20,36 +20,45 @@ * ***************************************************************************/ /* <DESC> - * An example source code that issues a HTTP POST and we provide the actual - * data through a read callback. + * Issue an HTTP POST and provide the data through the read callback. * </DESC> */ #include <stdio.h> #include <string.h> #include <curl/curl.h> -static const char data[]="this is what we post to the silly web server"; +/* silly test data to POST */ +static const char data[]="Lorem ipsum dolor sit amet, consectetur adipiscing " + "elit. Sed vel urna neque. Ut quis leo metus. Quisque eleifend, ex at " + "laoreet rhoncus, odio ipsum semper metus, at tempus ante urna in mauris. " + "Suspendisse ornare tempor venenatis. Ut dui neque, pellentesque a varius " + "eget, mattis vitae ligula. Fusce ut pharetra est. Ut ullamcorper mi ac " + "sollicitudin semper. Praesent sit amet tellus varius, posuere nulla non, " + "rhoncus ipsum."; struct WriteThis { const char *readptr; - long sizeleft; + size_t sizeleft; }; -static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *userp) +static size_t read_callback(void *dest, size_t size, size_t nmemb, void *userp) { - struct WriteThis *pooh = (struct WriteThis *)userp; - - if(size*nmemb < 1) - return 0; - - if(pooh->sizeleft) { - *(char *)ptr = pooh->readptr[0]; /* copy one single byte */ - pooh->readptr++; /* advance pointer */ - pooh->sizeleft--; /* less data left */ - return 1; /* we return 1 byte at a time! */ + struct WriteThis *wt = (struct WriteThis *)userp; + size_t buffer_size = size*nmemb; + + if(wt->sizeleft) { + /* copy as much as possible from the source to the destination */ + size_t copy_this_much = wt->sizeleft; + if(copy_this_much > buffer_size) + copy_this_much = buffer_size; + memcpy(dest, wt->readptr, copy_this_much); + + wt->readptr += copy_this_much; + wt->sizeleft -= copy_this_much; + return copy_this_much; /* we copied this many bytes */ } - return 0; /* no more data left to deliver */ + return 0; /* no more data left to deliver */ } int main(void) @@ -57,10 +66,10 @@ int main(void) CURL *curl; CURLcode res; - struct WriteThis pooh; + struct WriteThis wt; - pooh.readptr = data; - pooh.sizeleft = (long)strlen(data); + wt.readptr = data; + wt.sizeleft = strlen(data); /* In windows, this will init the winsock stuff */ res = curl_global_init(CURL_GLOBAL_DEFAULT); @@ -75,7 +84,7 @@ int main(void) curl = curl_easy_init(); if(curl) { /* First set the URL that is about to receive our POST. */ - curl_easy_setopt(curl, CURLOPT_URL, "http://example.com/index.cgi"); + curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/index.cgi"); /* Now specify we want to POST data */ curl_easy_setopt(curl, CURLOPT_POST, 1L); @@ -84,7 +93,7 @@ int main(void) curl_easy_setopt(curl, CURLOPT_READFUNCTION, read_callback); /* pointer to pass to our read function */ - curl_easy_setopt(curl, CURLOPT_READDATA, &pooh); + curl_easy_setopt(curl, CURLOPT_READDATA, &wt); /* get verbose debug output please */ curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L); @@ -108,7 +117,7 @@ int main(void) #else /* Set the expected POST size. If you want to POST large amounts of data, consider CURLOPT_POSTFIELDSIZE_LARGE */ - curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, pooh.sizeleft); + curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, wt.sizeleft); #endif #ifdef DISABLE_EXPECT |