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

/*  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_realpath_impl.h"

#include "slibtool_snprintf_impl.h"

#include "slibtool_visibility_impl.h"

slbt_hidden 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;

}

static int slbt_exec_link_normalize_dep_file(

	const struct slbt_driver_ctx *  dctx,

	int                             deps,

	char                            (*depfile)[PATH_MAX])

{

	int                             ret;

	int                             fdcwd;

	int                             fdtgt;

	char *                          dot;

	char *                          slash;

	const char *                    mark;

	struct slbt_txtfile_ctx *       tctx;

	const char **                   pline;

	char *                          tgtmark;

	char *                          depmark;

	char *                          relmark;

	char *                          tgtnext;

	char *                          depnext;

	char                            tgtdir  [PATH_MAX];

	char                            tgtpath [PATH_MAX];

	char                            deppath [PATH_MAX];

	char                            pathbuf [PATH_MAX];

	char                            depsbuf [PATH_MAX];

	char                            relapath[PATH_MAX];

	/* fdcwd */

	fdcwd = slbt_driver_fdcwd(dctx);

	/* first-pass dependency file */

	if (slbt_impl_get_txtfile_ctx(dctx,*depfile,deps,&tctx) < 0)

		return SLBT_NESTED_ERROR(dctx);

	/* second-pass dependency file */

	dot = strrchr(*depfile,'.');

	strcpy(dot,".tmp2");

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

		slbt_lib_free_txtfile_ctx(tctx);

		return SLBT_SYSTEM_ERROR(dctx,depfile);

	}

	/* fdtgt */

	strcpy(tgtdir,*depfile);

	if (!(slash = strrchr(tgtdir,'/')))

		slash = tgtdir;

	slash[0] = '\0';

	if ((slash = strrchr(tgtdir,'/'))) {

		slash[0] = '\0';

		slash++;

	} else {

		slash    = tgtdir;

		slash[0] = '.';

		slash[1] = '/';

		slash[2] = '\0';

	}

	if ((slash > tgtdir) && strcmp(slash,".libs")) {

		close(deps);

		slbt_lib_free_txtfile_ctx(tctx);

		return SLBT_CUSTOM_ERROR(

			dctx,

			SLBT_ERR_FLOW_ERROR);

	}

	if ((fdtgt = openat(fdcwd,tgtdir,O_DIRECTORY|O_CLOEXEC,0)) < 0) {

		close(deps);

		slbt_lib_free_txtfile_ctx(tctx);

		return SLBT_CUSTOM_ERROR(

			dctx,

			SLBT_ERR_FLOW_ERROR);

	}

	if (slbt_realpath(fdcwd,tgtdir,0,tgtpath,sizeof(tgtpath)) < 0) {

				close(fdtgt);

				close(deps);

				slbt_lib_free_txtfile_ctx(tctx);

				return SLBT_CUSTOM_ERROR(

					dctx,

					SLBT_ERR_FLOW_ERROR);

	}

	strcpy(pathbuf,tgtpath);

	/* normalize dependency lines as needed */

	for (pline=tctx->txtlinev; *pline; pline++) {

		if ((mark = *pline)) {

			if ((mark[0] == '-') && (mark[1] == 'L'))

					mark = &mark[2];

			if ((mark > *pline) && (mark[0] == '/'))

				mark = *pline;

		}

		if (mark > *pline) {

			if (slbt_realpath(

					fdtgt,mark,0,deppath,

					sizeof(deppath)) < 0)

				mark = *pline;

			else if ((tgtpath[0] != '/') || (deppath[0] != '/'))

				mark = 0;

			else

				strcpy(depsbuf,deppath);

		}

		if ((mark > *pline) && strcmp(tgtpath,deppath)) {

			tgtmark = tgtpath;

			depmark = deppath;

			tgtnext = strchr(tgtmark,'/');

			depnext = strchr(depmark,'/');

			while (tgtnext && depnext) {

				*tgtnext = '\0';

				*depnext = '\0';

				if (strcmp(tgtmark,depmark)) {

					tgtnext = 0;

					depnext = 0;

				} else {

					tgtmark = &tgtnext[1];

					depmark = &depnext[1];

					if (*tgtmark && *depmark) {

						tgtnext = strchr(tgtmark,'/');

						depnext = strchr(depmark,'/');

					} else {

						tgtnext = 0;

						depnext = 0;

					}

				}

			}

			strcpy(tgtmark,&pathbuf[tgtmark-tgtpath]);

			strcpy(depmark,&depsbuf[depmark-deppath]);

			if ((tgtmark - tgtpath) == (depmark - deppath)) {

				mark = &depmark[strlen(tgtmark)];

				if ((mark[0] == '/') && !strncmp(tgtmark,depmark,mark-depmark))

					sprintf(relapath,"-L.%s",mark);

				else

					mark = relapath;

			} else {

				mark = relapath;

			}

			if (mark == relapath) {

				relmark = relapath;

				relmark += sprintf(relapath,"-L../");

				while ((tgtnext = strchr(tgtmark,'/'))) {

					tgtmark = &tgtnext[1];

					relmark += sprintf(relmark,"../");

				}

				strcpy(relmark,depmark);

			}

			mark = relapath;

		} else if (mark > *pline) {

			strcpy(relapath,"-L.");

			mark = relapath;

		}

		ret = mark ? slbt_dprintf(deps,"%s\n",mark) : (-1);

		if (ret < 0) {

			close(deps);

			close(fdtgt);

			slbt_lib_free_txtfile_ctx(tctx);

			return mark

				? SLBT_SYSTEM_ERROR(dctx,0)

				: SLBT_NESTED_ERROR(dctx);

		}

		if (mark == relapath)

			strcpy(tgtpath,pathbuf);

	}

	close(fdtgt);

	slbt_lib_free_txtfile_ctx(tctx);

	return deps;

}

static int slbt_exec_link_compact_dep_file(

	const struct slbt_driver_ctx *  dctx,

	int                             deps,

	char                            (*depfile)[PATH_MAX])

{

	int                             fdcwd;

	struct slbt_txtfile_ctx *       tctx;

	const char **                   pline;

	const char **                   pcomp;

	const char *                    depline;

	char *                          dot;

	/* fdcwd */

	fdcwd = slbt_driver_fdcwd(dctx);

	/* second-pass dependency file */

	if (slbt_impl_get_txtfile_ctx(dctx,*depfile,deps,&tctx) < 0)

		return SLBT_NESTED_ERROR(dctx);

	/* second-pass dependency file */

	dot = strrchr(*depfile,'.');

	dot[0] = '\0';

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

		slbt_lib_free_txtfile_ctx(tctx);

		return SLBT_SYSTEM_ERROR(dctx,depfile);

	}

	/* iterate, only write unique entries */

	for (pline=tctx->txtlinev; *pline; pline++) {

		depline = *pline;

		if ((depline[0] == '-') && (depline[1] == 'L'))

			for (pcomp=tctx->txtlinev; depline && pcomp

				if (!strcmp(*pcomp,depline))

					depline = 0;

		if (depline && (slbt_dprintf(deps,"%s\n",depline) < 0)) {

			close(deps);

			slbt_lib_free_txtfile_ctx(tctx);

			return SLBT_SYSTEM_ERROR(dctx,0);

		}

	}

	slbt_lib_free_txtfile_ctx(tctx);

	return deps;

}

slbt_hidden 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			fdtmp;

	int			slen;

	int			fdcwd;

	char **			parg;

	char *			popt;

	char *			plib;

	char *			path;

	char *			mark;

	char *			base;

	size_t			size;

	bool                    fdep;

	char			deplib [PATH_MAX];

	char			deppref[PATH_MAX];

	char			reladir[PATH_MAX];

	char			depfile[PATH_MAX];

	char			pathbuf[PATH_MAX];

	struct stat		st;

	int			ldepth;

	int			fdyndep;

	struct slbt_map_info *  mapinfo;

	bool			is_reladir;

	/* fdcwd */

	fdcwd = slbt_driver_fdcwd(dctx);

	/* depfile */

	if (slbt_snprintf(depfile,sizeof(depfile),

			"%s.slibtool.deps.tmp1",

			libfilename) < 0)

		return SLBT_BUFFER_ERROR(dctx);

	strcpy(pathbuf,depfile);

	/* dependency prefix */

	if (depfile[0] == '/') {

		deppref[0] = '\0';

	} else {

		if ((mark = strrchr(depfile,'/')))

			*mark = 0;

		if (!mark)

			mark = depfile;

		if (slbt_realpath(fdcwd,depfile,0,reladir,sizeof(reladir)) < 0)

			return SLBT_SYSTEM_ERROR(dctx,0);

		if (slbt_realpath(fdcwd,"./",0,deppref,sizeof(deppref)) < 0)

			return SLBT_SYSTEM_ERROR(dctx,0);

		if (mark > depfile)

			*mark = '/';

		mark = &reladir[strlen(deppref)];

		*mark++ = '\0';

		if (strcmp(reladir,deppref))

			return SLBT_CUSTOM_ERROR(

				dctx,

				SLBT_ERR_FLOW_ERROR);

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

			base++;

		if (!base)

			base = mark;

		if (strcmp(base,".libs"))

			return SLBT_CUSTOM_ERROR(

				dctx,

				SLBT_ERR_FLOW_ERROR);

		base = mark;

		mark = deppref;

		for (; base; ) {

			if ((base = strchr(base,'/'))) {

				mark += sprintf(mark,"../");

				base++;

			}

		}

		*mark = '\0';

	}

	/* deps */

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

		return SLBT_SYSTEM_ERROR(dctx,depfile);

	/* informational header */

	if (slbt_realpath(fdcwd,"./",0,reladir,sizeof(reladir)) < 0)

		return SLBT_SYSTEM_ERROR(dctx,0);

	if (slbt_dprintf(deps,

			"# makefile target: %s\n"

			"# slibtool target: %s\n"

			"# cprocess fdcwd:  %s\n",

			dctx->cctx->output,

			libfilename,

			reladir) < 0)

		return SLBT_SYSTEM_ERROR(dctx,0);

	fdep = 0;

	/* iterate */

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

		popt    = 0;

		plib    = 0;

		path    = 0;

		mapinfo = 0;

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

			if (fdep) {

				if (slbt_dprintf(

						deps,

						"#\n# makefile target: %s\n",

						dctx->cctx->output) < 0)

					return SLBT_SYSTEM_ERROR(dctx,0);

				fdep = false;

			}

			popt = *parg;

			plib = popt + 2;

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

			if (fdep) {

				if (slbt_dprintf(

						deps,

						"#\n# makefile target: %s\n",

						dctx->cctx->output) < 0)

					return SLBT_SYSTEM_ERROR(dctx,0);

				fdep = false;

			}

			popt = *parg;

			path = popt + 2;

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

			(void)0;

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

			/* import dependency list */

			fdep = true;

			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/%s",

						deppref,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);

		}

	}

	if ((fdtmp = slbt_exec_link_normalize_dep_file(dctx,deps,&pathbuf)) < 0)

		return SLBT_NESTED_ERROR(dctx);

	close(deps);

	if ((deps = slbt_exec_link_compact_dep_file(dctx,fdtmp,&pathbuf)) < 0)

		return SLBT_NESTED_ERROR(dctx);

	close(deps);

	close(fdtmp);

	return 0;

}