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

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

/*  Copyright (C) 2016--2024  SysDeer Technologies, LLC            */

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

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

#include <stdlib.h>

#include <stdio.h>

#include <string.h>

#include <fcntl.h>

#include <errno.h>

#include <sys/stat.h>

#include <slibtool/slibtool.h>

#include "slibtool_driver_impl.h"

#include "slibtool_errinfo_impl.h"

#include "slibtool_linkcmd_impl.h"

#include "slibtool_mapfile_impl.h"

#include "slibtool_metafile_impl.h"

#include "slibtool_snprintf_impl.h"

int slbt_get_deps_meta(

	const struct slbt_driver_ctx *	dctx,

	char *				libfilename,

	int				fexternal,

	struct slbt_deps_meta *		depsmeta)

{

	int			fdcwd;

	char *			ch;

	char *			cap;

	char *			base;

	size_t			libexlen;

	struct stat		st;

	struct slbt_map_info *	mapinfo;

	char			depfile[PATH_MAX];

	/* fdcwd */

	fdcwd = slbt_driver_fdcwd(dctx);

	/* -rpath */

	if (slbt_snprintf(depfile,sizeof(depfile),

				"%s.slibtool.rpath",

				libfilename) < 0)

		return SLBT_BUFFER_ERROR(dctx);

	/* -Wl,%s */

	if (!fstatat(fdcwd,depfile,&st,AT_SYMLINK_NOFOLLOW)) {

		depsmeta->infolen += st.st_size + 4;

		depsmeta->infolen++;

	}

	/* .deps */

	if (slbt_snprintf(depfile,sizeof(depfile),

				"%s.slibtool.deps",

				libfilename) < 0)

		return SLBT_BUFFER_ERROR(dctx);

	/* mapinfo */

	if (!(mapinfo = slbt_map_file(fdcwd,depfile,SLBT_MAP_INPUT)))

		return (fexternal && (errno == ENOENT))

			? 0 : SLBT_SYSTEM_ERROR(dctx,depfile);

	/* copied length */

	depsmeta->infolen += mapinfo->size;

	depsmeta->infolen++;

	/* libexlen */

	libexlen = (base = strrchr(libfilename,'/'))

		? strlen(depfile) + 2 + (base - libfilename)

		: strlen(depfile) + 2;

	/* iterate */

	ch  = mapinfo->addr;

	cap = mapinfo->cap;

	for (; ch

		if (*ch++ == '\n') {

			depsmeta->infolen += libexlen;

			depsmeta->depscnt++;

		}

	}

	slbt_unmap_file(mapinfo);

	return 0;

}

int slbt_exec_link_create_dep_file(

	const struct slbt_driver_ctx *	dctx,

	struct slbt_exec_ctx *		ectx,

	char **				altv,

	const char *			libfilename,

	bool				farchive)

{

	int			ret;

	int			deps;

	int			slen;

	int			fdcwd;

	char **			parg;

	char *			popt;

	char *			plib;

	char *			path;

	char *			mark;

	char *			base;

	size_t			size;

	char			deplib [PATH_MAX];

	bool			is_reladir;

	char			reladir[PATH_MAX];

	char			depfile[PATH_MAX];

	struct stat		st;

	int			ldepth;

	int			fdyndep;

	struct slbt_map_info *  mapinfo;

	/* fdcwd */

	fdcwd = slbt_driver_fdcwd(dctx);

	/* depfile */

	if (slbt_snprintf(depfile,sizeof(depfile),

			"%s.slibtool.deps",

			libfilename) < 0)

		return SLBT_BUFFER_ERROR(dctx);

	/* deps */

	if ((deps = openat(fdcwd,depfile,O_RDWR|O_CREAT|O_TRUNC,0644)) < 0)

		return SLBT_SYSTEM_ERROR(dctx,depfile);

	/* iterate */

	for (parg=altv; *parg; parg++) {

		popt    = 0;

		plib    = 0;

		path    = 0;

		mapinfo = 0;

		if (!strncmp(*parg,"-l",2)) {

			popt = *parg;

			plib = popt + 2;

		} else if (!strncmp(*parg,"-L",2)) {

			popt = *parg;

			path = popt + 2;

		} else if (!strncmp(*parg,"-f",2)) {

			(void)0;

		} else if ((popt = strrchr(*parg,'.')) && !strcmp(popt,".la")) {

			/* import dependency list */

			if ((base = strrchr(*parg,'/')))

				base++;

			else

				base = *parg;

			/* [relative .la directory] */

			if (base > *parg) {

				slen = slbt_snprintf(

					reladir,

					sizeof(reladir),

					"%s",*parg);

				if (slen < 0) {

					close(deps);

					return SLBT_BUFFER_ERROR(dctx);

				}

				is_reladir = true;

				reladir[base - *parg - 1] = 0;

			} else {

				is_reladir = false;

				reladir[0] = '.';

				reladir[1] = 0;

			}

			/* dynamic library dependency? */

			strcpy(depfile,*parg);

			mark = depfile + (base - *parg);

			size = sizeof(depfile) - (base - *parg);

			slen = slbt_snprintf(mark,size,".libs/%s",base);

			if (slen < 0) {

				close(deps);

				return SLBT_BUFFER_ERROR(dctx);

			}

			mark = strrchr(mark,'.');

			strcpy(mark,dctx->cctx->settings.dsosuffix);

			fdyndep = !fstatat(fdcwd,depfile,&st,0);

			/* [-L... as needed] */

			if (fdyndep && (ectx->ldirdepth >= 0)) {

				if (slbt_dprintf(deps,"-L") < 0) {

					close(deps);

					return SLBT_SYSTEM_ERROR(dctx,0);

				}

				for (ldepth=ectx->ldirdepth; ldepth; ldepth--) {

					if (slbt_dprintf(deps,"../") < 0) {

						close(deps);

						return SLBT_SYSTEM_ERROR(dctx,0);

					}

				}

				if (slbt_dprintf(deps,"%s%s.libs\n",

						 (is_reladir ? reladir : ""),

						 (is_reladir ? "/" : "")) < 0) {

					close(deps);

					return SLBT_SYSTEM_ERROR(dctx,0);

				}

			}

			/* -ldeplib */

			if (fdyndep) {

				*popt = 0;

				mark  = base;

				mark += strlen(dctx->cctx->settings.dsoprefix);

				if (slbt_dprintf(deps,"-l%s\n",mark) < 0) {

					close(deps);

					return SLBT_SYSTEM_ERROR(dctx,0);

				}

				*popt = '.';

			}

			/* [open dependency list] */

			strcpy(depfile,*parg);

			mark = depfile + (base - *parg);

			size = sizeof(depfile) - (base - *parg);

			slen = slbt_snprintf(mark,size,".libs/%s",base);

			if (slen < 0) {

				close(deps);

				return SLBT_BUFFER_ERROR(dctx);

			}

			mapinfo = 0;

			mark = strrchr(mark,'.');

			size = sizeof(depfile) - (mark - depfile);

			if (!farchive) {

				slen = slbt_snprintf(mark,size,

					"%s.slibtool.deps",

					dctx->cctx->settings.dsosuffix);

				if (slen < 0) {

					close(deps);

					return SLBT_BUFFER_ERROR(dctx);

				}

				mapinfo = slbt_map_file(

					fdcwd,depfile,

					SLBT_MAP_INPUT);

				if (!mapinfo && (errno != ENOENT)) {

					close(deps);

					return SLBT_SYSTEM_ERROR(dctx,0);

				}

			}

			if (!mapinfo) {

				slen = slbt_snprintf(mark,size,

					".a.slibtool.deps");

				if (slen < 0) {

					close(deps);

					return SLBT_BUFFER_ERROR(dctx);

				}

				mapinfo = slbt_map_file(

					fdcwd,depfile,

					SLBT_MAP_INPUT);

				if (!mapinfo) {

					strcpy(mark,".a.disabled");

					if (fstatat(fdcwd,depfile,&st,AT_SYMLINK_NOFOLLOW)) {

						close(deps);

						return SLBT_SYSTEM_ERROR(dctx,depfile);

					}

				}

			}

			/* [-l... as needed] */

			while (mapinfo && (mapinfo->mark < mapinfo->cap)) {

				ret = slbt_mapped_readline(

					dctx,mapinfo,

					deplib,sizeof(deplib));

				if (ret) {

					close(deps);

					return SLBT_NESTED_ERROR(dctx);

				}

				ret = ((deplib[0] == '-')

						&& (deplib[1] == 'L')

						&& (deplib[2] != '/'))

					? slbt_dprintf(

						deps,"-L%s/%s",

						reladir,&deplib[2])

					: slbt_dprintf(

						deps,"%s",

						deplib);

				if (ret < 0) {

					close(deps);

					return SLBT_SYSTEM_ERROR(dctx,0);

				}

			}

			if (mapinfo)

				slbt_unmap_file(mapinfo);

		}

		if (plib && (slbt_dprintf(deps,"-l%s\n",plib) < 0)) {

			close(deps);

			return SLBT_SYSTEM_ERROR(dctx,0);

		}

		if (path && (slbt_dprintf(deps,"-L%s\n",path) < 0)) {

			close(deps);

			return SLBT_SYSTEM_ERROR(dctx,0);

		}

	}

	return 0;

}