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

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

/*  Copyright (C) 2016--2017  Z. Gilboa                            */

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

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

#include <stdio.h>

#include <limits.h>

#include <unistd.h>

#include <string.h>

#include <stdlib.h>

#include <stdbool.h>

#include <sys/wait.h>

#include <slibtool/slibtool.h>

#include "slibtool_spawn_impl.h"

#include "slibtool_readlink_impl.h"

#include "slibtool_errinfo_impl.h"

static char * slbt_mri_argument(

	char *	arg,

	char *	buf)

{

	int	i;

	char *	lnk;

	char *	target;

	char 	mricwd[PATH_MAX];

	char 	dstbuf[PATH_MAX];

	if ((!(strchr(arg,'+'))) && (!(strchr(arg,'-'))))

		return arg;

	if (arg[0] == '/')

		target = arg;

	else {

		if (!(getcwd(mricwd,sizeof(mricwd))))

			return 0;

		if ((size_t)snprintf(dstbuf,sizeof(dstbuf),"%s/%s",

				mricwd,arg) >= sizeof(dstbuf))

			return 0;

		target = dstbuf;

	}

	for (i=0,lnk=0; i<1024 && !lnk; i++) {

		if (!(tmpnam(buf)))

			return 0;

		if (!(symlink(target,buf)))

			lnk = buf;

	}

	return lnk;

}

static void slbt_archive_import_child(

	char *	program,

	int	fd[2])

{

	char *	argv[3];

	argv[0] = program;

	argv[1] = "-M";

	argv[2] = 0;

	close(fd[1]);

	if (dup2(fd[0],0) == 0)

		execvp(program,argv);

	_exit(EXIT_FAILURE);

}

int slbt_archive_import(

	const struct slbt_driver_ctx *	dctx,

	struct slbt_exec_ctx *		ectx,

	char *				dstarchive,

	char *				srcarchive)

{

	int	ret;

	pid_t	pid;

	pid_t	rpid;

	int	fd[2];

	FILE *	fout;

	char *	dst;

	char *	src;

	char	mridst [L_tmpnam];

	char	mrisrc [L_tmpnam];

	char	program[PATH_MAX];

	if (!slbt_readlink(srcarchive,program,sizeof(program)))

		if (!(strcmp(program,"/dev/null")))

			return 0;

	if ((size_t)snprintf(program,sizeof(program),"%s",

			dctx->cctx->host.ar) >= sizeof(program))

		return SLBT_BUFFER_ERROR(dctx);

	if (pipe(fd))

		return SLBT_SYSTEM_ERROR(dctx);

	if ((pid = fork()) < 0) {

		close(fd[0]);

		close(fd[1]);

		return SLBT_SYSTEM_ERROR(dctx);

	}

	if (pid == 0)

		slbt_archive_import_child(

			program,

			fd);

	ectx->pid = pid;

	dst = slbt_mri_argument(dstarchive,mridst);

	src = slbt_mri_argument(srcarchive,mrisrc);

	if ((fout = fdopen(fd[1],"a"))) {

		ret = (fprintf(

				fout,

				"OPEN %s\n"

				"ADDLIB %s\n"

				"SAVE\n"

				"END\n",

				dst,

				src) < 0)

			? SLBT_SYSTEM_ERROR(dctx)

			: 0;

		fclose(fout);

		close(fd[0]);

	} else {

		ret = SLBT_SYSTEM_ERROR(dctx);

		close(fd[0]);

		close(fd[1]);

	}

	rpid = waitpid(

		pid,

		&ectx->exitcode,

		0);

	if (dst == mridst)

		unlink(dst);

	if (src == mrisrc)

		unlink(src);

	return ret || (rpid != pid) || ectx->exitcode

		? SLBT_CUSTOM_ERROR(dctx,SLBT_ERR_ARCHIVE_IMPORT) : 0;

}