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

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

/*  Copyright (C) 2016--2018  Z. Gilboa                            */

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

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

#include <fcntl.h>

#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_driver_impl.h"

#include "slibtool_spawn_impl.h"

#include "slibtool_dprintf_impl.h"

#include "slibtool_symlink_impl.h"

#include "slibtool_readlink_impl.h"

#include "slibtool_errinfo_impl.h"

static char * slbt_mri_argument(

	int	fdat,

	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 (slbt_realpath(fdat,".",O_DIRECTORY,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 (!(symlinkat(target,fdat,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	fdcwd;

	pid_t	pid;

	pid_t	rpid;

	int	fd[2];

	char *	dst;

	char *	src;

	char *	fmt;

	char	mridst [L_tmpnam];

	char	mrisrc [L_tmpnam];

	char	program[PATH_MAX];

	/* fdcwd */

	fdcwd = slbt_driver_fdcwd(dctx);

	/* not needed? */

	if (slbt_symlink_is_a_placeholder(fdcwd,srcarchive))

		return 0;

	/* program */

	if ((size_t)snprintf(program,sizeof(program),

				"%s",

				dctx->cctx->host.ar)

			>= sizeof(program))

		return SLBT_BUFFER_ERROR(dctx);

	/* fork */

	if (pipe(fd))

		return SLBT_SYSTEM_ERROR(dctx,0);

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

		close(fd[0]);

		close(fd[1]);

		return SLBT_SYSTEM_ERROR(dctx,0);

	}

	/* child */

	if (pid == 0)

		slbt_archive_import_child(

			program,

			fd);

	/* parent */

	close(fd[0]);

	ectx->pid = pid;

	dst = slbt_mri_argument(fdcwd,dstarchive,mridst);

	src = slbt_mri_argument(fdcwd,srcarchive,mrisrc);

	if (!dst || !src)

		return SLBT_SYSTEM_ERROR(dctx,0);

	fmt = "OPEN %s\n"

	      "ADDLIB %s\n"

	      "SAVE\n"

	      "END\n";

	if (slbt_dprintf(fd[1],fmt,dst,src) < 0) {

		close(fd[1]);

		return SLBT_SYSTEM_ERROR(dctx,0);

	}

	close(fd[1]);

	rpid = waitpid(

		pid,

		&ectx->exitcode,

		0);

	if (dst == mridst)

		unlinkat(fdcwd,dst,0);

	if (src == mrisrc)

		unlinkat(fdcwd,src,0);

	return (rpid == pid) && (ectx->exitcode == 0)

		? 0 : SLBT_CUSTOM_ERROR(dctx,SLBT_ERR_ARCHIVE_IMPORT);

}