Blame src/logic/linkcmd/slbt_linkcmd_deps.c

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/*******************************************************************/
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/*  slibtool: a skinny libtool implementation, written in C        */
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/*  Copyright (C) 2016--2024  SysDeer Technologies, LLC            */
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/*  Released under the Standard MIT License; see COPYING.SLIBTOOL. */
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/*******************************************************************/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <slibtool/slibtool.h>
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#include "slibtool_driver_impl.h"
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#include "slibtool_errinfo_impl.h"
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#include "slibtool_linkcmd_impl.h"
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#include "slibtool_mapfile_impl.h"
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#include "slibtool_metafile_impl.h"
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#include "slibtool_realpath_impl.h"
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#include "slibtool_snprintf_impl.h"
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#include "slibtool_visibility_impl.h"
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slbt_hidden int slbt_get_deps_meta(
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	const struct slbt_driver_ctx *	dctx,
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	char *				libfilename,
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	int				fexternal,
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	struct slbt_deps_meta *		depsmeta)
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{
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	int			fdcwd;
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	char *			ch;
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	char *			cap;
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	char *			base;
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	size_t			libexlen;
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	struct stat		st;
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	struct slbt_map_info *	mapinfo;
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	char			depfile[PATH_MAX];
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	/* fdcwd */
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	fdcwd = slbt_driver_fdcwd(dctx);
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	/* -rpath */
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	if (slbt_snprintf(depfile,sizeof(depfile),
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				"%s.slibtool.rpath",
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				libfilename) < 0)
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		return SLBT_BUFFER_ERROR(dctx);
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	/* -Wl,%s */
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	if (!fstatat(fdcwd,depfile,&st,AT_SYMLINK_NOFOLLOW)) {
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		depsmeta->infolen += st.st_size + 4;
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		depsmeta->infolen++;
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	}
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	/* .deps */
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	if (slbt_snprintf(depfile,sizeof(depfile),
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				"%s.slibtool.deps",
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				libfilename) < 0)
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		return SLBT_BUFFER_ERROR(dctx);
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	/* mapinfo */
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	if (!(mapinfo = slbt_map_file(fdcwd,depfile,SLBT_MAP_INPUT)))
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		return (fexternal && (errno == ENOENT))
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			? 0 : SLBT_SYSTEM_ERROR(dctx,depfile);
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	/* copied length */
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	depsmeta->infolen += mapinfo->size;
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	depsmeta->infolen++;
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	/* libexlen */
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	libexlen = (base = strrchr(libfilename,'/'))
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		? strlen(depfile) + 2 + (base - libfilename)
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		: strlen(depfile) + 2;
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	/* iterate */
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	ch  = mapinfo->addr;
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	cap = mapinfo->cap;
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	for (; ch
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		if (*ch++ == '\n') {
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			depsmeta->infolen += libexlen;
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			depsmeta->depscnt++;
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		}
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	}
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	slbt_unmap_file(mapinfo);
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	return 0;
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}
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static int slbt_exec_link_normalize_dep_file(
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	const struct slbt_driver_ctx *  dctx,
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	int                             deps,
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	char                            (*depfile)[PATH_MAX])
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{
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	int                             ret;
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	int                             fdcwd;
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	int                             fdtgt;
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	char *                          dot;
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	char *                          slash;
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	const char *                    mark;
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	struct slbt_txtfile_ctx *       tctx;
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	const char **                   pline;
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	char *                          tgtmark;
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	char *                          depmark;
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	char *                          relmark;
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	char *                          tgtnext;
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	char *                          depnext;
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	char                            tgtdir  [PATH_MAX];
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	char                            tgtpath [PATH_MAX];
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	char                            deppath [PATH_MAX];
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	char                            pathbuf [PATH_MAX];
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	char                            depsbuf [PATH_MAX];
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	char                            relapath[PATH_MAX];
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	/* fdcwd */
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	fdcwd = slbt_driver_fdcwd(dctx);
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	/* first-pass dependency file */
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	if (slbt_impl_get_txtfile_ctx(dctx,*depfile,deps,&tctx) < 0)
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		return SLBT_NESTED_ERROR(dctx);
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	/* second-pass dependency file */
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	dot = strrchr(*depfile,'.');
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	strcpy(dot,".tmp2");
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	if ((deps = openat(fdcwd,*depfile,O_RDWR|O_CREAT|O_TRUNC,0644)) < 0) {
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		slbt_lib_free_txtfile_ctx(tctx);
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		return SLBT_SYSTEM_ERROR(dctx,depfile);
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	}
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	/* fdtgt */
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	strcpy(tgtdir,*depfile);
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	if (!(slash = strrchr(tgtdir,'/')))
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		slash = tgtdir;
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	slash[0] = '\0';
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	if ((slash = strrchr(tgtdir,'/'))) {
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		slash[0] = '\0';
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		slash++;
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	} else {
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		slash    = tgtdir;
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		slash[0] = '.';
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		slash[1] = '/';
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		slash[2] = '\0';
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	}
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	if ((slash > tgtdir) && strcmp(slash,".libs")) {
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		close(deps);
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		slbt_lib_free_txtfile_ctx(tctx);
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		return SLBT_CUSTOM_ERROR(
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			dctx,
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			SLBT_ERR_FLOW_ERROR);
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	}
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	if ((fdtgt = openat(fdcwd,tgtdir,O_DIRECTORY|O_CLOEXEC,0)) < 0) {
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		close(deps);
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		slbt_lib_free_txtfile_ctx(tctx);
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		return SLBT_CUSTOM_ERROR(
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			dctx,
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			SLBT_ERR_FLOW_ERROR);
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	}
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	if (slbt_realpath(fdcwd,tgtdir,0,tgtpath,sizeof(tgtpath)) < 0) {
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				close(fdtgt);
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				close(deps);
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				slbt_lib_free_txtfile_ctx(tctx);
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				return SLBT_CUSTOM_ERROR(
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					dctx,
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					SLBT_ERR_FLOW_ERROR);
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	}
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	strcpy(pathbuf,tgtpath);
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	/* normalize dependency lines as needed */
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	for (pline=tctx->txtlinev; *pline; pline++) {
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		if ((mark = *pline)) {
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			if ((mark[0] == '-') && (mark[1] == 'L'))
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					mark = &mark[2];
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			if ((mark > *pline) && (mark[0] == '/'))
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				mark = *pline;
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		}
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		if (mark > *pline) {
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			if (slbt_realpath(
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					fdtgt,mark,0,deppath,
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					sizeof(deppath)) < 0)
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				mark = *pline;
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			else if ((tgtpath[0] != '/') || (deppath[0] != '/'))
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				mark = 0;
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			else
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				strcpy(depsbuf,deppath);
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		}
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		if ((mark > *pline) && strcmp(tgtpath,deppath)) {
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			tgtmark = tgtpath;
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			depmark = deppath;
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			tgtnext = strchr(tgtmark,'/');
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			depnext = strchr(depmark,'/');
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			while (tgtnext && depnext) {
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				*tgtnext = '\0';
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				*depnext = '\0';
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				if (strcmp(tgtmark,depmark)) {
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					tgtnext = 0;
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					depnext = 0;
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				} else {
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					tgtmark = &tgtnext[1];
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					depmark = &depnext[1];
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					if (*tgtmark && *depmark) {
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						tgtnext = strchr(tgtmark,'/');
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						depnext = strchr(depmark,'/');
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					} else {
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						tgtnext = 0;
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						depnext = 0;
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					}
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				}
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			}
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			strcpy(tgtmark,&pathbuf[tgtmark-tgtpath]);
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			strcpy(depmark,&depsbuf[depmark-deppath]);
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			if ((tgtmark - tgtpath) == (depmark - deppath)) {
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				mark = &depmark[strlen(tgtmark)];
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				if ((mark[0] == '/') && !strncmp(tgtmark,depmark,mark-depmark))
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					sprintf(relapath,"-L.%s",mark);
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				else
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					mark = relapath;
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			} else {
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				mark = relapath;
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			}
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			if (mark == relapath) {
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				relmark = relapath;
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				relmark += sprintf(relapath,"-L../");
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				while ((tgtnext = strchr(tgtmark,'/'))) {
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					tgtmark = &tgtnext[1];
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					relmark += sprintf(relmark,"../");
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				}
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				strcpy(relmark,depmark);
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			}
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			mark = relapath;
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		} else if (mark > *pline) {
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			strcpy(relapath,"-L.");
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			mark = relapath;
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		}
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		ret = mark ? slbt_dprintf(deps,"%s\n",mark) : (-1);
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		if (ret < 0) {
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			close(deps);
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			close(fdtgt);
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			slbt_lib_free_txtfile_ctx(tctx);
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			return mark
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				? SLBT_SYSTEM_ERROR(dctx,0)
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				: SLBT_NESTED_ERROR(dctx);
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		}
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		if (mark == relapath)
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			strcpy(tgtpath,pathbuf);
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	}
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	close(fdtgt);
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	slbt_lib_free_txtfile_ctx(tctx);
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	return deps;
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}
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static int slbt_exec_link_compact_dep_file(
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	const struct slbt_driver_ctx *  dctx,
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	int                             deps,
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	char                            (*depfile)[PATH_MAX])
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{
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	int                             fdcwd;
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	struct slbt_txtfile_ctx *       tctx;
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	const char **                   pline;
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	const char **                   pcomp;
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	const char *                    depline;
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	char *                          dot;
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	/* fdcwd */
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	fdcwd = slbt_driver_fdcwd(dctx);
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	/* second-pass dependency file */
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	if (slbt_impl_get_txtfile_ctx(dctx,*depfile,deps,&tctx) < 0)
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		return SLBT_NESTED_ERROR(dctx);
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	/* second-pass dependency file */
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	dot = strrchr(*depfile,'.');
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	dot[0] = '\0';
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	if ((deps = openat(fdcwd,*depfile,O_RDWR|O_CREAT|O_TRUNC,0644)) < 0) {
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		slbt_lib_free_txtfile_ctx(tctx);
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		return SLBT_SYSTEM_ERROR(dctx,depfile);
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	}
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	/* iterate, only write unique entries */
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	for (pline=tctx->txtlinev; *pline; pline++) {
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		depline = *pline;
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		if ((depline[0] == '-') && (depline[1] == 'L'))
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			for (pcomp=tctx->txtlinev; depline && pcomp
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				if (!strcmp(*pcomp,depline))
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					depline = 0;
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		if (depline && (slbt_dprintf(deps,"%s\n",depline) < 0)) {
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			close(deps);
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			slbt_lib_free_txtfile_ctx(tctx);
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			return SLBT_SYSTEM_ERROR(dctx,0);
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		}
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	}
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	slbt_lib_free_txtfile_ctx(tctx);
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	return deps;
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}
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slbt_hidden int slbt_exec_link_create_dep_file(
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	const struct slbt_driver_ctx *	dctx,
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	struct slbt_exec_ctx *		ectx,
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	char **				altv,
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	const char *			libfilename,
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	bool				farchive)
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{
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	int			ret;
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	int			deps;
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	int			fdtmp;
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	int			slen;
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	int			fdcwd;
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	char **			parg;
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	char *			popt;
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	char *			plib;
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	char *			path;
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	char *			mark;
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	char *			base;
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	size_t			size;
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	bool                    fdep;
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	char			deplib [PATH_MAX];
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	char			deppref[PATH_MAX];
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	char			reladir[PATH_MAX];
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	char			depfile[PATH_MAX];
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	char			pathbuf[PATH_MAX];
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	struct stat		st;
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	int			ldepth;
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	int			fdyndep;
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	struct slbt_map_info *  mapinfo;
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	bool			is_reladir;
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	/* fdcwd */
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	fdcwd = slbt_driver_fdcwd(dctx);
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	/* depfile */
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	if (slbt_snprintf(depfile,sizeof(depfile),
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			"%s.slibtool.deps.tmp1",
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			libfilename) < 0)
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		return SLBT_BUFFER_ERROR(dctx);
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	strcpy(pathbuf,depfile);
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	/* dependency prefix */
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	if (depfile[0] == '/') {
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		deppref[0] = '\0';
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	} else {
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		if ((mark = strrchr(depfile,'/')))
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			*mark = 0;
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		if (!mark)
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			mark = depfile;
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		if (slbt_realpath(fdcwd,depfile,0,reladir,sizeof(reladir)) < 0)
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			return SLBT_SYSTEM_ERROR(dctx,0);
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		if (slbt_realpath(fdcwd,"./",0,deppref,sizeof(deppref)) < 0)
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			return SLBT_SYSTEM_ERROR(dctx,0);
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		if (mark > depfile)
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			*mark = '/';
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		mark = &reladir[strlen(deppref)];
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		*mark++ = '\0';
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		if (strcmp(reladir,deppref))
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			return SLBT_CUSTOM_ERROR(
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				dctx,
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				SLBT_ERR_FLOW_ERROR);
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		if ((base = strrchr(mark,'/')))
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			base++;
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		if (!base)
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			base = mark;
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		if (strcmp(base,".libs"))
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			return SLBT_CUSTOM_ERROR(
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				dctx,
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				SLBT_ERR_FLOW_ERROR);
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		base = mark;
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		mark = deppref;
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		for (; base; ) {
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			if ((base = strchr(base,'/'))) {
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				mark += sprintf(mark,"../");
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				base++;
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			}
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		}
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		*mark = '\0';
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	}
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	/* deps */
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	if ((deps = openat(fdcwd,depfile,O_RDWR|O_CREAT|O_TRUNC,0644)) < 0)
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		return SLBT_SYSTEM_ERROR(dctx,depfile);
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	/* informational header */
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	if (slbt_realpath(fdcwd,"./",0,reladir,sizeof(reladir)) < 0)
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		return SLBT_SYSTEM_ERROR(dctx,0);
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	if (slbt_dprintf(deps,
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			"# makefile target: %s\n"
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			"# slibtool target: %s\n"
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			"# cprocess fdcwd:  %s\n",
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			dctx->cctx->output,
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			libfilename,
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			reladir) < 0)
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		return SLBT_SYSTEM_ERROR(dctx,0);
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	fdep = 0;
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	/* iterate */
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	for (parg=altv; *parg; parg++) {
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		popt    = 0;
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		plib    = 0;
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		path    = 0;
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		mapinfo = 0;
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		if (!strncmp(*parg,"-l",2)) {
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			if (fdep) {
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				if (slbt_dprintf(
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						deps,
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						"#\n# makefile target: %s\n",
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						dctx->cctx->output) < 0)
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					return SLBT_SYSTEM_ERROR(dctx,0);
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				fdep = false;
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			}
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			popt = *parg;
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			plib = popt + 2;
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		} else if (!strncmp(*parg,"-L",2)) {
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			if (fdep) {
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				if (slbt_dprintf(
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						deps,
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						"#\n# makefile target: %s\n",
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						dctx->cctx->output) < 0)
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					return SLBT_SYSTEM_ERROR(dctx,0);
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				fdep = false;
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			}
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			popt = *parg;
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			path = popt + 2;
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		} else if (!strncmp(*parg,"-f",2)) {
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			(void)0;
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		} else if ((popt = strrchr(*parg,'.')) && !strcmp(popt,".la")) {
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			/* import dependency list */
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			fdep = true;
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			if ((base = strrchr(*parg,'/')))
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				base++;
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			else
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				base = *parg;
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			/* [relative .la directory] */
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			if (base > *parg) {
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				slen = slbt_snprintf(
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					reladir,
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					sizeof(reladir),
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					"%s",*parg);
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				if (slen < 0) {
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					close(deps);
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					return SLBT_BUFFER_ERROR(dctx);
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				}
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				is_reladir = true;
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				reladir[base - *parg - 1] = 0;
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			} else {
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				is_reladir = false;
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				reladir[0] = '.';
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				reladir[1] = 0;
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			}
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			/* dynamic library dependency? */
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			strcpy(depfile,*parg);
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			mark = depfile + (base - *parg);
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			size = sizeof(depfile) - (base - *parg);
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			slen = slbt_snprintf(mark,size,".libs/%s",base);
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			if (slen < 0) {
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				close(deps);
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				return SLBT_BUFFER_ERROR(dctx);
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			}
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			mark = strrchr(mark,'.');
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			strcpy(mark,dctx->cctx->settings.dsosuffix);
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			fdyndep = !fstatat(fdcwd,depfile,&st,0);
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			/* [-L... as needed] */
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			if (fdyndep && (ectx->ldirdepth >= 0)) {
b08054
				if (slbt_dprintf(deps,"-L") < 0) {
b08054
					close(deps);
b08054
					return SLBT_SYSTEM_ERROR(dctx,0);
b08054
				}
b08054
b08054
				for (ldepth=ectx->ldirdepth; ldepth; ldepth--) {
b08054
					if (slbt_dprintf(deps,"../") < 0) {
b08054
						close(deps);
b08054
						return SLBT_SYSTEM_ERROR(dctx,0);
b08054
					}
b08054
				}
b08054
b08054
				if (slbt_dprintf(deps,"%s%s.libs\n",
b08054
						 (is_reladir ? reladir : ""),
b08054
						 (is_reladir ? "/" : "")) < 0) {
b08054
					close(deps);
b08054
					return SLBT_SYSTEM_ERROR(dctx,0);
b08054
				}
b08054
			}
b08054
b08054
			/* -ldeplib */
b08054
			if (fdyndep) {
b08054
				*popt = 0;
b08054
				mark  = base;
b08054
				mark += strlen(dctx->cctx->settings.dsoprefix);
b08054
b08054
				if (slbt_dprintf(deps,"-l%s\n",mark) < 0) {
b08054
					close(deps);
b08054
					return SLBT_SYSTEM_ERROR(dctx,0);
b08054
				}
b08054
b08054
				*popt = '.';
b08054
			}
b08054
b08054
			/* [open dependency list] */
b08054
			strcpy(depfile,*parg);
b08054
			mark = depfile + (base - *parg);
b08054
			size = sizeof(depfile) - (base - *parg);
b08054
			slen = slbt_snprintf(mark,size,".libs/%s",base);
b08054
b08054
			if (slen < 0) {
b08054
				close(deps);
b08054
				return SLBT_BUFFER_ERROR(dctx);
b08054
			}
b08054
b08054
			mapinfo = 0;
b08054
b08054
			mark = strrchr(mark,'.');
b08054
			size = sizeof(depfile) - (mark - depfile);
b08054
b08054
			if (!farchive) {
b08054
				slen = slbt_snprintf(mark,size,
b08054
					"%s.slibtool.deps",
b08054
					dctx->cctx->settings.dsosuffix);
b08054
b08054
				if (slen < 0) {
b08054
					close(deps);
b08054
					return SLBT_BUFFER_ERROR(dctx);
b08054
				}
b08054
b08054
				mapinfo = slbt_map_file(
b08054
					fdcwd,depfile,
b08054
					SLBT_MAP_INPUT);
b08054
b08054
				if (!mapinfo && (errno != ENOENT)) {
b08054
					close(deps);
b08054
					return SLBT_SYSTEM_ERROR(dctx,0);
b08054
				}
b08054
			}
b08054
b08054
			if (!mapinfo) {
b08054
				slen = slbt_snprintf(mark,size,
b08054
					".a.slibtool.deps");
b08054
b08054
				if (slen < 0) {
b08054
					close(deps);
b08054
					return SLBT_BUFFER_ERROR(dctx);
b08054
				}
b08054
b08054
				mapinfo = slbt_map_file(
b08054
					fdcwd,depfile,
b08054
					SLBT_MAP_INPUT);
b08054
b08054
				if (!mapinfo) {
b08054
					strcpy(mark,".a.disabled");
b08054
b08054
					if (fstatat(fdcwd,depfile,&st,AT_SYMLINK_NOFOLLOW)) {
b08054
						close(deps);
b08054
						return SLBT_SYSTEM_ERROR(dctx,depfile);
b08054
					}
b08054
				}
b08054
			}
b08054
b08054
			/* [-l... as needed] */
b08054
			while (mapinfo && (mapinfo->mark < mapinfo->cap)) {
b08054
				ret = slbt_mapped_readline(
b08054
					dctx,mapinfo,
b08054
					deplib,sizeof(deplib));
b08054
b08054
				if (ret) {
b08054
					close(deps);
b08054
					return SLBT_NESTED_ERROR(dctx);
b08054
				}
b08054
b08054
				ret = ((deplib[0] == '-')
b08054
						&& (deplib[1] == 'L')
b08054
						&& (deplib[2] != '/'))
b08054
					? slbt_dprintf(
62a007
						deps,"-L%s%s/%s",
62a007
						deppref,reladir,&deplib[2])
b08054
					: slbt_dprintf(
b08054
						deps,"%s",
b08054
						deplib);
b08054
b08054
				if (ret < 0) {
b08054
					close(deps);
b08054
					return SLBT_SYSTEM_ERROR(dctx,0);
b08054
				}
b08054
			}
b08054
b08054
			if (mapinfo)
b08054
				slbt_unmap_file(mapinfo);
b08054
		}
b08054
b08054
		if (plib && (slbt_dprintf(deps,"-l%s\n",plib) < 0)) {
b08054
			close(deps);
b08054
			return SLBT_SYSTEM_ERROR(dctx,0);
b08054
		}
b08054
b08054
		if (path && (slbt_dprintf(deps,"-L%s\n",path) < 0)) {
b08054
			close(deps);
b08054
			return SLBT_SYSTEM_ERROR(dctx,0);
b08054
		}
b08054
	}
b08054
43ee04
	if ((fdtmp = slbt_exec_link_normalize_dep_file(dctx,deps,&pathbuf)) < 0)
43ee04
		return SLBT_NESTED_ERROR(dctx);
43ee04
43ee04
	close(deps);
43ee04
43ee04
	if ((deps = slbt_exec_link_compact_dep_file(dctx,fdtmp,&pathbuf)) < 0)
43ee04
		return SLBT_NESTED_ERROR(dctx);
43ee04
43ee04
	close(deps);
43ee04
	close(fdtmp);
43ee04
b08054
	return 0;
b08054
}