quickjs-tart

quickjs-based runtime for wallet-core logic
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postinmemory.c (3449B)

      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  * Make an HTTP POST with data from memory and receive response in memory.
     26  * </DESC>
     27  */
     28 #include <stdio.h>
     29 #include <stdlib.h>
     30 #include <string.h>
     31 #include <curl/curl.h>
     32 
     33 struct MemoryStruct {
     34   char *memory;
     35   size_t size;
     36 };
     37 
     38 static size_t
     39 WriteMemoryCallback(void *contents, size_t size, size_t nmemb, void *userp)
     40 {
     41   size_t realsize = size * nmemb;
     42   struct MemoryStruct *mem = (struct MemoryStruct *)userp;
     43 
     44   char *ptr = realloc(mem->memory, mem->size + realsize + 1);
     45   if(!ptr) {
     46     /* out of memory! */
     47     printf("not enough memory (realloc returned NULL)\n");
     48     return 0;
     49   }
     50 
     51   mem->memory = ptr;
     52   memcpy(&(mem->memory[mem->size]), contents, realsize);
     53   mem->size += realsize;
     54   mem->memory[mem->size] = 0;
     55 
     56   return realsize;
     57 }
     58 
     59 int main(void)
     60 {
     61   CURL *curl;
     62   CURLcode res;
     63   struct MemoryStruct chunk;
     64   static const char *postthis = "Field=1&Field=2&Field=3";
     65 
     66   chunk.memory = malloc(1);  /* grown as needed by realloc above */
     67   chunk.size = 0;    /* no data at this point */
     68 
     69   curl_global_init(CURL_GLOBAL_ALL);
     70   curl = curl_easy_init();
     71   if(curl) {
     72     curl_easy_setopt(curl, CURLOPT_URL, "https://www.example.org/");
     73 
     74     /* send all data to this function  */
     75     curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
     76 
     77     /* we pass our 'chunk' struct to the callback function */
     78     curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&chunk);
     79 
     80     /* some servers do not like requests that are made without a user-agent
     81        field, so we provide one */
     82     curl_easy_setopt(curl, CURLOPT_USERAGENT, "libcurl-agent/1.0");
     83 
     84     curl_easy_setopt(curl, CURLOPT_POSTFIELDS, postthis);
     85 
     86     /* if we do not provide POSTFIELDSIZE, libcurl calls strlen() by itself */
     87     curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, (long)strlen(postthis));
     88 
     89     /* Perform the request, res gets the return code */
     90     res = curl_easy_perform(curl);
     91     /* Check for errors */
     92     if(res != CURLE_OK) {
     93       fprintf(stderr, "curl_easy_perform() failed: %s\n",
     94               curl_easy_strerror(res));
     95     }
     96     else {
     97       /*
     98        * Now, our chunk.memory points to a memory block that is chunk.size
     99        * bytes big and contains the remote file.
    100        *
    101        * Do something nice with it!
    102        */
    103       printf("%s\n",chunk.memory);
    104     }
    105 
    106     /* always cleanup */
    107     curl_easy_cleanup(curl);
    108   }
    109 
    110   free(chunk.memory);
    111   curl_global_cleanup();
    112   return 0;
    113 }