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

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

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

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

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

#include <string.h>

#include <limits.h>

#include <slibtool/slibtool.h>

#include "slibtool_driver_impl.h"

#include "slibtool_snprintf_impl.h"

#include "slibtool_errinfo_impl.h"

#include "slibtool_visibility_impl.h"

#include "slibtool_m4fake_impl.h"

slbt_hidden int slbt_m4fake_expand_cmdarg(

	const struct slbt_driver_ctx *  dctx,

	struct slbt_txtfile_ctx *       sctx,

	const char *                    cmdname,

	char                            (*argbuf)[PATH_MAX])

{

	const char **             pline;

	size_t                    slen;

	const char *              mark;

	const char *              match;

	const char *              cap;

	int                       fquote;

	char                      varbuf[PATH_MAX];

	char                      strbuf[PATH_MAX];

	memset(*argbuf,0,sizeof(*argbuf));

	slen  = strlen(cmdname);

	pline = sctx->txtlinev;

	match = 0;

	for (; !match && *pline; ) {

		if (!strncmp(*pline,cmdname,slen)) {

			if ((*pline)[slen] == '(') {

				mark  = &(*pline)[slen];

				cap   = ++mark;

				for (fquote=0; !match && *cap; ) {

					if (*cap == '[')

						fquote++;

					else if ((*cap == ']') && fquote)

						fquote--;

					else if ((*cap == ')') && !fquote)

						match = cap;

					if (!match)

						cap++;

				}

				if (!match)

					return SLBT_CUSTOM_ERROR(

						dctx,

						SLBT_ERR_FLOW_ERROR);

			}

		}

		if (!match)

			pline++;

	}

	if (!match)

		return 0;

	strncpy(strbuf,mark,cap-mark);

	strbuf[cap-mark] = '\0';

	mark = strbuf;

	slen = strlen(mark);

	if ((mark[0] == '[') && (mark[--slen] == ']')) {

		strcpy(*argbuf,++mark);

		(*argbuf)[--slen] = '\0';

		return 0;

	}

	if (slbt_snprintf(

			varbuf,sizeof(varbuf),

			"AC_DEFUN([%s],",

			strbuf) < 0)

		return SLBT_BUFFER_ERROR(dctx);

	slen = strlen(varbuf);

	for (--pline; pline >= sctx->txtlinev; pline--) {

		if (!strncmp(*pline,varbuf,slen)) {

			mark  = &(*pline)[slen];

			cap   = mark;

			match = 0;

			for (fquote=0; !match && *cap; ) {

				if (*cap == '[')

					fquote++;

				else if ((*cap == ']') && fquote)

					fquote--;

				else if ((*cap == ')') && !fquote)

					match = cap;

				if (!match)

					cap++;

			}

			if (!match)

				return SLBT_CUSTOM_ERROR(

					dctx,

					SLBT_ERR_FLOW_ERROR);

			strncpy(strbuf,mark,cap-mark);

			strbuf[cap-mark] = '\0';

			mark = strbuf;

			slen = strlen(mark);

			if ((mark[0] == '[') && (mark[--slen] == ']')) {

				strcpy(*argbuf,++mark);

				(*argbuf)[--slen] = '\0';

				return 0;

			}

			if (slbt_snprintf(

					varbuf,sizeof(varbuf),

					"AC_DEFUN([%s],",

					strbuf) < 0)

				return SLBT_BUFFER_ERROR(dctx);

			slen = strlen(varbuf);

		}

	}

	strcpy(*argbuf,strbuf);

	return 0;

}