made some char * into const char * and I removed the check for size > 0

 * be sent in one go.

 */

static CURLcode

 add_buffer(send_buffer *in, void *inptr, size_t size);

 add_buffer(send_buffer *in, const void *inptr, size_t size);

/*

 * add_buffer_init() returns a fine buffer struct

 * add_bufferf() builds a buffer from the formatted input

 */

static

CURLcode add_bufferf(send_buffer *in, char *fmt, ...)

CURLcode add_bufferf(send_buffer *in, const char *fmt, ...)

{

  CURLcode result = CURLE_OUT_OF_MEMORY;

  char *s;

 * add_buffer() appends a memory chunk to the existing one

 */

static

CURLcode add_buffer(send_buffer *in, void *inptr, size_t size)

CURLcode add_buffer(send_buffer *in, const void *inptr, size_t size)

{

  char *new_rb;

  int new_size;

  if(size > 0) {

  if(!in->buffer ||

     ((in->size_used + size) > (in->size_max - 1))) {

    new_size = (in->size_used+size)*2;

  memcpy(&in->buffer[in->size_used], inptr, size);

  in->size_used += size;

  }

  return CURLE_OK;

}

 * This function checks the linked list of custom HTTP headers for a particular

 * header (prefix).

 */

bool static checkheaders(struct UrlData *data, char *thisheader)

static bool checkheaders(struct UrlData *data, const char *thisheader)

{

  struct curl_slist *head;

  size_t thislen = strlen(thisheader);