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

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

/*  Copyright (C) 2016--2018  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"

#include "slibtool_driver_impl.h"

#include "slibtool_errinfo_impl.h"

int  slbt_exec_execute(

	const struct slbt_driver_ctx *	dctx,

	struct slbt_exec_ctx *		ectx)

{

	int			ret;

	int			fdcwd;

	char *			program;

	char *			script;

	char *			base;

	char *			mark;

	char			exeref [PATH_MAX];

	char			wrapper[PATH_MAX];

	struct stat		st;

	struct slbt_exec_ctx *	actx = 0;

	/* dry run */

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

		return 0;

	/* context */

	if (ectx)

		slbt_disable_placeholders(ectx);

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

		return ret;

	else {

		actx = ectx;

		slbt_disable_placeholders(ectx);

	}

	/* script, program */

	program = ectx->cargv[0];

	script  = ectx->cargv[1];

	if (script) {

		/* wrapper */

		if ((size_t)snprintf(wrapper,sizeof(wrapper),"%s%s.exe.wrapper",

					(script[0] == '/') ? "" : "./",

					script)

				>= sizeof(wrapper)) {

			slbt_free_exec_ctx(actx);

			return SLBT_BUFFER_ERROR(dctx);

		}

		/* exeref */

		if ((base = strrchr(script,'/')))

			base++;

		else

			base = script;

		strcpy(exeref,script);

		mark = exeref + (base - script);

		sprintf(mark,".libs/%s",base);

		/* fdcwd */

		fdcwd = slbt_driver_fdcwd(dctx);

		/* swap vector */

		if (!fstatat(fdcwd,script,&st,0) && !fstatat(fdcwd,wrapper,&st,0)) {

			ectx->cargv[0] = wrapper;

			ectx->cargv[1] = program;

			ectx->cargv[2] = exeref;

		} else {

			script = program;

		}

		/* execute mode */

		ectx->program = script;

		ectx->argv    = ectx->cargv;

	} else {

		ectx->program = program;

		ectx->argv    = ectx->cargv;

	}

	/* step output */

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

		if (slbt_output_execute(dctx,ectx)) {

			slbt_free_exec_ctx(actx);

			return SLBT_NESTED_ERROR(dctx);

		}

	execvp(ectx->cargv[0],ectx->argv);

	slbt_free_exec_ctx(actx);

	return SLBT_SYSTEM_ERROR(dctx,0);

}