using libcurl to achieve something like "curl ADDRESS --data-binary @-FILE" because it's more portable than using an OS call, and we need a reliable method of uploading, and soon downloading, files of various sizes and descriptions. long term goal is to make this part of the updater toolchain for 3d printer firmware. For now, it will live here a…

curler.c

#include <curl/curl.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <errno.h>

int main(int argc, char *argv[])
{
  int fd;
  char *data;
  struct stat sbuf;
  CURL *curl = curl_easy_init();
    if (argc != 3) {
    fprintf(stderr, "usage: curler ADDRESS FILE\n");
    exit(1);

}
  if ((fd = open(argv[1], O_RDONLY)) == -1) {
    perror("open");
    exit(1);

  }

  if (stat(argv[1], &sbuf) == -1) {
    perror("stat");
    exit(1);

  }


  if ((data = mmap((caddr_t)0, sbuf.st_size, PROT_READ, MAP_SHARED, fd, 0)) == (caddr_t)(-1)) {
    perror("mmap");
    exit(1);

  }

  printf("curling\r\n");
  curl_easy_setopt(curl, CURLOPT_URL, argv[2]);
  curl_easy_setopt(curl, CURLOPT_POSTFIELDS, data);
  curl_easy_perform(curl);

  munmap(data, sizeof(data));
  return 0;

}

 [curler] curl -O https://gist.githubusercontent.com/treeherder/5299c2591e07b531f2aa/raw/831d9acf62167a49eb74e792d42492b810564ecf/curler.c
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   883  100   883    0     0   5130      0 --:--:-- --:--:-- --:--:--  5133
[curler] gcc -lcurl curler.c -o test
[curler] ./test
usage: curler ADDRESS FILE
[curler] ./test curler.c paste.click
curling
http://paste.click/SExZSq
[curler]