httrack/libtest/callbacks-example-displayheader.c

/*
    HTTrack external callbacks example : display all incoming request headers
    Example of <wrappername>_init and <wrappername>_exit call (httrack >> 3.31)
    .c file

    How to build: (callback.so or callback.dll)
      With GNU-GCC:
        gcc -O -g3 -Wall -D_REENTRANT -shared -o mycallback.so callbacks-example.c -lhttrack1
      With MS-Visual C++:
        cl -LD -nologo -W3 -Zi -Zp4 -DWIN32 -Fe"mycallback.dll" callbacks-example.c libhttrack1.lib

      Note: the httrack library linker option is only necessary when using libhttrack's functions inside the callback

    How to use:
      httrack --wrapper mycallback ..
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

/* Standard httrack module includes */
#include "httrack-library.h"
#include "htsopt.h"
#include "htsdefines.h"

/* Local function definitions */
static int process(t_hts_callbackarg *carg, httrackp *opt, 
                   char* buff, const char* adr, const char* fil, 
                   const char* referer_adr, const char* referer_fil, 
                   htsblk* incoming);

/* external functions */
EXTERNAL_FUNCTION int hts_plug(httrackp *opt, const char* argv);

/* 
module entry point 
*/
EXTERNAL_FUNCTION int hts_plug(httrackp *opt, const char* argv) {
  const char *arg = strchr(argv, ',');
  if (arg != NULL)
    arg++;

  /* Plug callback functions */
  CHAIN_FUNCTION(opt, receivehead, process, NULL);

  return 1;  /* success */
}

static int process(t_hts_callbackarg *carg, httrackp *opt, 
                   char* buff, const char* adr, const char* fil, 
                   const char* referer_adr, const char* referer_fil, 
                   htsblk* incoming) {

  /* Call parent functions if multiple callbacks are chained. */
  if (CALLBACKARG_PREV_FUN(carg, receivehead) != NULL) {
    if (!CALLBACKARG_PREV_FUN(carg, receivehead)(CALLBACKARG_PREV_CARG(carg), opt, buff, adr, fil, referer_adr, referer_fil, incoming)) {
      return 0;  /* Abort */
    }
  }

  /* Process */
  printf("[ %s%s ]\n%s\n", adr, fil, buff);

  return 1;   /* success */
}