/*******************************************************************/

/*  slibtool: a skinny libtool implementation, written in C        */

/*  Copyright (C) 2016--2024  SysDeer Technologies, LLC            */

/*  Released under the Standard MIT License; see COPYING.SLIBTOOL. */

/*******************************************************************/

#include <stdio.h>

#include <string.h>

#include <stdbool.h>

#include <slibtool/slibtool.h>

#include "slibtool_driver_impl.h"

#include "slibtool_dprintf_impl.h"

#include "slibtool_errinfo_impl.h"

static const char lconf_begin[] = "# ### BEGIN LIBTOOL CONFIG\n";

static const char lconf_end  [] = "# ### END LIBTOOL CONFIG\n";

static int slbt_output_config_lconf(

	const struct slbt_driver_ctx * dctx,

	const struct slbt_map_info *   lconf)

{

	const char *    ch;

	const char *    cfg_begin;

	const char *    cfg_end;

	const char *    map_cap;

	size_t          cmp_len;

	size_t          end_len;

	size_t          min_len;

	size_t          nbytes;

	ssize_t         written;

	int             fdout;

	cmp_len = strlen(lconf_begin);

	end_len = strlen(lconf_end);

	min_len = cmp_len + end_len;

	if (lconf->size < min_len)

		return SLBT_CUSTOM_ERROR(

			dctx,

			SLBT_ERR_FLOW_ERROR);

	map_cap  = lconf->addr;

	map_cap += lconf->size;

	map_cap -= strlen(lconf_end);

	map_cap -= strlen(lconf_begin);

	cfg_begin = cfg_end = 0;

	for (ch=lconf->addr; !cfg_begin && (ch < map_cap); ch++)

		if (!strncmp(ch,lconf_begin,cmp_len))

			cfg_begin = ch;

	if (!cfg_begin)

		return SLBT_CUSTOM_ERROR(

			dctx,

			SLBT_ERR_FLOW_ERROR);

	for (++ch; !cfg_end && (ch < map_cap); ch++)

		if (!strncmp(ch,lconf_end,end_len))

			cfg_end = ch;

	if (!cfg_end)

		return SLBT_CUSTOM_ERROR(

			dctx,

			SLBT_ERR_FLOW_ERROR);

	fdout  = slbt_driver_fdout(dctx);

	nbytes = cfg_end - cfg_begin - cmp_len;

	for (ch=&cfg_begin[cmp_len]; nbytes; ) {

		written = write(fdout,ch,nbytes);

		while ((written < 0) && (errno == EINTR))

			written = write(fdout,ch,nbytes);

		if (written < 0)

			return SLBT_SYSTEM_ERROR(dctx,0);

		nbytes -= written;

		ch     += written;

	}

	return 0;

}

int slbt_output_config(const struct slbt_driver_ctx * dctx)

{

	struct slbt_driver_ctx_impl *   ictx;

	const struct slbt_map_info *    lconf;

	ictx  = slbt_get_driver_ictx(dctx);

	lconf = &ictx->lconf;

	if (lconf->addr)

		return slbt_output_config_lconf(

			dctx,lconf);

	return 0;

}