HTTrack remove param from query string plugin

wrapper.c

// Remove sid= from query string plugin for HTTrack
// by krzys_h, 2018-05-15
// https://gist.github.com/krzys-h/4717608089c54f733083fd390e5c0f2b

// This makes HTTrack automatically remove the sid= parameter from URLs it visits, as there is no way this can be done with commandline parameters (see https://forum.httrack.com/readmsg/27508/index.html)

// Compilation and usage:
// gcc -shared -o wrapper.so -fPIC -I/usr/include/httrack wrapper.c
// httrack --wrapper ./wrapper.so ...

// see https://www.httrack.com/html/plug.html

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

#include <httrack-library.h>
#include <htsopt.h>
#include <htsdefines.h>

static int my_link_detected(t_hts_callbackarg *carg, httrackp* opt,
                            char* link, const const char* tag_start)
{
	for (char* query = strchr(link, '?'); query != NULL; query = strchr(query, '&'))
	{
		++query; // skip the separator
		if (*query == '\0')
			break;
		if (strncmp(query, "sid=", 4) == 0 || strncmp(query, "amp;sid=", 8) == 0)
		{
			char* tgt = query;
			char* src = strchr(query, '&');
			if (src != NULL)
			{
				++src; // skip the separator
				while(*src != '\0')
				{
					*tgt++ = *src++;
				}
			}
			*tgt = '\0';
		}
	}
	char* end = strchr(link, '\0');
	--end; // go to last valid character
	while (*end == '&' || *end == '?')
		*end-- = '\0'; // clean up trailing & or ?
	//printf("%s\n", link);
	return 1; /* yes, process this */
}

EXTERNAL_FUNCTION int hts_plug(httrackp *opt, const char* argv)
{
	fprintf(stderr, "Module plugged\n");
	CHAIN_FUNCTION(opt, linkdetected2, my_link_detected, NULL);

	return 1;  /* success */
}

EXTERNAL_FUNCTION int hts_unplug(httrackp *opt)
{
	fprintf(stderr, "Module unplugged\n");

	return 1;  /* success */
}

Nice! Let me see if I can make it work on my own installation.