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

/*  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 <ctype.h>

#include <fcntl.h>

#include <errno.h>

#include <stdint.h>

#include <stddef.h>

#include <stdlib.h>

#include <string.h>

#include <sys/stat.h>

#include <slibtool/slibtool.h>

#include "slibtool_driver_impl.h"

#include "slibtool_errinfo_impl.h"

#include "slibtool_realpath_impl.h"

#include "slibtool_stoolie_impl.h"

#include "slibtool_txtline_impl.h"

#include "slibtool_m4fake_impl.h"

static const char slbt_this_dir[2] = {'.',0};

static int slbt_st_free_stoolie_ctx_impl(

	struct slbt_stoolie_ctx_impl *  ctx,

	int                             fdsrc,

	int                             ret)

{

	char ** parg;

	if (ctx) {

		if (fdsrc >= 0)

			close(fdsrc);

		if (ctx->fdtgt >= 0)

			close(ctx->fdtgt);

		if (ctx->fdaux >= 0)

			close(ctx->fdaux);

		if (ctx->fdm4 >= 0)

			close(ctx->fdm4);

		for (parg=ctx->m4argv; parg && *parg; parg++)

			free(*parg);

		free(ctx->m4buf);

		free(ctx->m4argv);

		free(ctx->auxbuf);

		free(ctx->pathbuf);

		slbt_lib_free_txtfile_ctx(ctx->acinc);

		slbt_lib_free_txtfile_ctx(ctx->cfgac);

		slbt_lib_free_txtfile_ctx(ctx->makam);

		free(ctx);

	}

	return ret;

}

int slbt_st_get_stoolie_ctx(

	const struct slbt_driver_ctx *	dctx,

	const char *			path,

	struct slbt_stoolie_ctx **	pctx)

{

	struct slbt_stoolie_ctx_impl *	ctx;

	int                             cint;

	int                             fdcwd;

	int                             fdtgt;

	int                             fdsrc;

	const char **                   pline;

	char **                         margv;

	const char *                    mark;

	const char *                    dpath;

	char                            pathbuf[PATH_MAX];

	/* target directory: fd and real path*/

	fdcwd = slbt_driver_fdcwd(dctx);

	if ((fdtgt = openat(fdcwd,path,O_DIRECTORY|O_CLOEXEC,0)) < 0)

		return SLBT_SYSTEM_ERROR(dctx,path);

	if (slbt_realpath(fdtgt,".",0,pathbuf,sizeof(pathbuf)) < 0) {

		close(fdtgt);

		return SLBT_SYSTEM_ERROR(dctx,path);

	}

	/* context alloc and init */

	if (!(ctx = calloc(1,sizeof(*ctx)))) {

		close(fdtgt);

		return SLBT_BUFFER_ERROR(dctx);

	}

	ctx->fdtgt = fdtgt;

	ctx->fdaux = (-1);

	ctx->fdm4  = (-1);

	/* target directory real path */

	if (!(ctx->pathbuf = strdup(pathbuf)))

		return slbt_st_free_stoolie_ctx_impl(ctx,(-1),

			SLBT_NESTED_ERROR(dctx));

	/* acinclude.m4, configure.ac, Makefile.am */

	if ((fdsrc = openat(fdtgt,"acinlcude.m4",O_RDONLY,0)) < 0) {

		if (errno != ENOENT)

			return slbt_st_free_stoolie_ctx_impl(ctx,fdsrc,

				SLBT_SYSTEM_ERROR(dctx,"acinlcude.m4"));

	} else {

		if (slbt_impl_get_txtfile_ctx(dctx,"acinclude.m4",fdsrc,&ctx->acinc) < 0)

			return slbt_st_free_stoolie_ctx_impl(ctx,fdsrc,

				SLBT_NESTED_ERROR(dctx));

		close(fdsrc);

	}

	if ((fdsrc = openat(fdtgt,"configure.ac",O_RDONLY,0)) < 0) {

		if (errno != ENOENT)

			return slbt_st_free_stoolie_ctx_impl(ctx,fdsrc,

				SLBT_SYSTEM_ERROR(dctx,"configure.ac"));

	} else {

		if (slbt_impl_get_txtfile_ctx(dctx,"configure.ac",fdsrc,&ctx->cfgac) < 0)

			return slbt_st_free_stoolie_ctx_impl(ctx,fdsrc,

				SLBT_NESTED_ERROR(dctx));

		close(fdsrc);

	}

	if ((fdsrc = openat(fdtgt,"Makefile.am",O_RDONLY,0)) < 0) {

		if (errno != ENOENT)

			return slbt_st_free_stoolie_ctx_impl(ctx,fdsrc,

				SLBT_SYSTEM_ERROR(dctx,"Makefile.am"));

	} else {

		if (slbt_impl_get_txtfile_ctx(dctx,"Makefile.am",fdsrc,&ctx->makam) < 0)

			return slbt_st_free_stoolie_ctx_impl(ctx,fdsrc,

				SLBT_NESTED_ERROR(dctx));

		close(fdsrc);

	}

	/* aux dir */

	if (ctx->acinc) {

		if (slbt_m4fake_expand_cmdarg(

				dctx,ctx->acinc,

				"AC_CONFIG_AUX_DIR",

				&pathbuf) < 0)

			return slbt_st_free_stoolie_ctx_impl(

				ctx,(-1),

				SLBT_NESTED_ERROR(dctx));

		if (pathbuf[0])

			if (!(ctx->auxbuf = strdup(pathbuf)))

				return slbt_st_free_stoolie_ctx_impl(

					ctx,(-1),

					SLBT_NESTED_ERROR(dctx));

	}

	if (!ctx->auxbuf && ctx->cfgac) {

		if (slbt_m4fake_expand_cmdarg(

				dctx,ctx->cfgac,

				"AC_CONFIG_AUX_DIR",

				&pathbuf) < 0)

			return slbt_st_free_stoolie_ctx_impl(

				ctx,(-1),

				SLBT_NESTED_ERROR(dctx));

		if (pathbuf[0])

			if (!(ctx->auxbuf = strdup(pathbuf)))

				return slbt_st_free_stoolie_ctx_impl(

					ctx,(-1),

					SLBT_NESTED_ERROR(dctx));

	}

	/* m4 dir */

	if (ctx->acinc) {

		if (slbt_m4fake_expand_cmdarg(

				dctx,ctx->acinc,

				"AC_CONFIG_MACRO_DIR",

				&pathbuf) < 0)

			return slbt_st_free_stoolie_ctx_impl(

				ctx,(-1),

				SLBT_NESTED_ERROR(dctx));

		if (pathbuf[0])

			if (!(ctx->m4buf = strdup(pathbuf)))

				return slbt_st_free_stoolie_ctx_impl(

					ctx,(-1),

					SLBT_NESTED_ERROR(dctx));

	}

	if (!ctx->m4buf && ctx->cfgac) {

		if (slbt_m4fake_expand_cmdarg(

				dctx,ctx->cfgac,

				"AC_CONFIG_MACRO_DIR",

				&pathbuf) < 0)

			return slbt_st_free_stoolie_ctx_impl(

				ctx,(-1),

				SLBT_NESTED_ERROR(dctx));

		if (pathbuf[0])

			if (!(ctx->m4buf = strdup(pathbuf)))

				return slbt_st_free_stoolie_ctx_impl(

					ctx,(-1),

					SLBT_NESTED_ERROR(dctx));

	}

	if (!ctx->m4buf && ctx->makam) {

		for (pline=ctx->makam->txtlinev; !ctx->m4argv && *pline; pline++) {

			if (!strncmp(*pline,"ACLOCAL_AMFLAGS",15)) {

				if (isspace((cint = (*pline)[15])) || ((*pline)[15] == '=')) {

					mark = &(*pline)[15];

					for (; isspace(cint = *mark); )

						mark++;

					if (mark[0] != '=')

						return slbt_st_free_stoolie_ctx_impl(

							ctx,(-1),

							SLBT_CUSTOM_ERROR(

								dctx,

								SLBT_ERR_FLOW_ERROR));

					if (slbt_txtline_to_string_vector(++mark,&margv) < 0)

						return slbt_st_free_stoolie_ctx_impl(

							ctx,(-1),

							SLBT_CUSTOM_ERROR(

								dctx,

								SLBT_ERR_FLOW_ERROR));

					ctx->m4argv = margv;

					if (!strcmp((mark = margv[0]),"-I")) {

						ctx->m4buf = strdup(margv[1]);

					} else if (!strncmp(mark,"-I",2)) {

						ctx->m4buf = strdup(&mark[2]);

					}

					if (!ctx->m4buf)

						return slbt_st_free_stoolie_ctx_impl(

							ctx,(-1),

							SLBT_CUSTOM_ERROR(

								dctx,

								SLBT_ERR_FLOW_ERROR));

				}

			}

		}

	}

	/* build-aux directory */

	if (!(dpath = ctx->auxbuf))

		dpath = slbt_this_dir;

	if ((ctx->fdaux = openat(fdtgt,dpath,O_DIRECTORY,0)) < 0)

		if (errno == ENOENT)

			if (!mkdirat(fdtgt,dpath,0755))

				ctx->fdaux = openat(fdtgt,dpath,O_DIRECTORY,0);

	if (ctx->fdaux < 0)

		return slbt_st_free_stoolie_ctx_impl(

			ctx,(-1),

			SLBT_SYSTEM_ERROR(dctx,dpath));

	/* m4 directory */

	if ((dpath = ctx->m4buf))

		if ((ctx->fdm4 = openat(fdtgt,dpath,O_DIRECTORY,0)) < 0)

			if (errno == ENOENT)

				if (!mkdirat(fdtgt,dpath,0755))

					ctx->fdm4 = openat(fdtgt,dpath,O_DIRECTORY,0);

	if (dpath && (ctx->fdm4 < 0))

		return slbt_st_free_stoolie_ctx_impl(

			ctx,(-1),

			SLBT_SYSTEM_ERROR(dctx,dpath));

	/* all done */

	ctx->path        = ctx->pathbuf;

	ctx->auxarg      = ctx->auxbuf;

	ctx->m4arg       = ctx->m4buf;

	ctx->zctx.path   = &ctx->path;

	ctx->zctx.acinc  = ctx->acinc;

	ctx->zctx.cfgac  = ctx->cfgac;

	ctx->zctx.makam  = ctx->makam;

	ctx->zctx.auxarg = &ctx->auxarg;

	ctx->zctx.m4arg  = &ctx->m4arg;

	*pctx = &ctx->zctx;

	return 0;

}

void slbt_st_free_stoolie_ctx(struct slbt_stoolie_ctx * ctx)

{

	struct slbt_stoolie_ctx_impl *	ictx;

	uintptr_t			addr;

	if (ctx) {

		addr = (uintptr_t)ctx - offsetof(struct slbt_stoolie_ctx_impl,zctx);

		ictx = (struct slbt_stoolie_ctx_impl *)addr;

		slbt_st_free_stoolie_ctx_impl(ictx,(-1),0);

	}

}