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

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

/*  Copyright (C) 2016  Z. Gilboa                                  */

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

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

#include <string.h>

#include <stdbool.h>

#include <fcntl.h>

#include <errno.h>

#include <sys/stat.h>

#include <slibtool/slibtool.h>

#include "slibtool_spawn_impl.h"

static int slbt_exec_compile_remove_file(

	const struct slbt_driver_ctx *	dctx,

	struct slbt_exec_ctx *		ectx,

	const char *			target)

{

	/* remove target (if any) */

	if (!(unlink(target)) || (errno == ENOENT))

		return 0;

	if (!(dctx->cctx->drvflags & SLBT_DRIVER_SILENT))

		strerror(errno);

	return -1;

}

int  slbt_exec_compile(

	const struct slbt_driver_ctx *	dctx,

	struct slbt_exec_ctx *		ectx)

{

	int			ret;

	int			fdlibs;

	FILE *			fout;

	struct slbt_exec_ctx *	actx = 0;

	const struct slbt_source_version * verinfo;

	/* dry run */

	if (dctx->cctx->drvflags & SLBT_DRIVER_DRY_RUN)

		return 0;

	/* context */

	if (ectx)

		slbt_reset_placeholders(ectx);

	else if ((ret = slbt_get_exec_ctx(dctx,&ectx)))

		return ret;

	else

		actx = ectx;

	/* remove old .lo wrapper */

	if (slbt_exec_compile_remove_file(dctx,ectx,ectx->ltobjname))

		return -1;

	/* .libs directory */

	if (dctx->cctx->drvflags & SLBT_DRIVER_SHARED) {

		if ((fdlibs = open(ectx->ldirname,O_DIRECTORY)) >= 0)

			close(fdlibs);

		else if ((errno != ENOENT) || mkdir(ectx->ldirname,0777)) {

			slbt_free_exec_ctx(actx);

			return -1;

		}

	}

	/* compile mode */

	ectx->program = ectx->compiler;

	ectx->argv    = ectx->cargv;

	/* shared library object */

	if (dctx->cctx->drvflags & SLBT_DRIVER_SHARED) {

		if (!(dctx->cctx->drvflags & SLBT_DRIVER_ANTI_PIC)) {

			*ectx->dpic = "-DPIC";

			*ectx->fpic = "-fPIC";

		}

		switch (dctx->cctx->tag) {

			case SLBT_TAG_NASM:

				break;

			default:

				*ectx->cass = "-c";

				break;

		}

		*ectx->lout[0] = "-o";

		*ectx->lout[1] = ectx->lobjname;

		if (!(dctx->cctx->drvflags & SLBT_DRIVER_SILENT)) {

			if (slbt_output_compile(dctx,ectx)) {

				slbt_free_exec_ctx(actx);

				return -1;

			}

		}

		if (((ret = slbt_spawn(ectx,true)) < 0) || ectx->exitcode) {

			slbt_free_exec_ctx(actx);

			return -1;

		}

	}

	/* static archive object */

	if (dctx->cctx->drvflags & SLBT_DRIVER_STATIC) {

		slbt_reset_placeholders(ectx);

		if (dctx->cctx->drvflags & SLBT_DRIVER_PRO_PIC) {

			*ectx->dpic = "-DPIC";

			*ectx->fpic = "-fPIC";

		}

		switch (dctx->cctx->tag) {

			case SLBT_TAG_NASM:

				break;

			default:

				*ectx->cass = "-c";

				break;

		}

		*ectx->lout[0] = "-o";

		*ectx->lout[1] = ectx->aobjname;

		if (!(dctx->cctx->drvflags & SLBT_DRIVER_SILENT)) {

			if (slbt_output_compile(dctx,ectx)) {

				slbt_free_exec_ctx(actx);

				return -1;

			}

		}

		if (((ret = slbt_spawn(ectx,true)) < 0) || ectx->exitcode) {

			slbt_free_exec_ctx(actx);

			return -1;

		}

	}

	/* libtool object */

	if (!(fout = fopen(ectx->ltobjname,"w"))) {

		slbt_free_exec_ctx(actx);

		return -1;

	}

	verinfo = slbt_source_version();

	ret = fprintf(fout,

		"# libtool compatible object wrapper\n"

		"# Generated by %s (slibtool %d.%d.%d)\n"

		"# [commit reference: %s]\n\n"

		"pic_object='%s'\n"

		"non_pic_object='%s'\n",

		dctx->program,

		verinfo->major,verinfo->minor,verinfo->revision,

		verinfo->commit,

		(dctx->cctx->drvflags & SLBT_DRIVER_SHARED)

			? ectx->lobjname

			: "none",

		(dctx->cctx->drvflags & SLBT_DRIVER_STATIC)

			? ectx->aobjname

			: "none");

	fclose(fout);

	slbt_free_exec_ctx(actx);

	return (ret > 0) ? 0 : -1;

}