446 lines
9.9 KiB
C
446 lines
9.9 KiB
C
#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <dirent.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <math.h>
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#include <fnmatch.h>
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#include <limits.h>
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#include <ctype.h>
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#include <time.h>
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#include <dirent.h>
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#ifndef _MSC_VER
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# include <unistd.h>
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# include <sys/param.h>
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#endif
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#ifdef HAVE_EVIL
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# include <Evil.h> /* for realpath */
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#else
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# include <pwd.h>
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# include <grp.h>
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# include <glob.h>
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#endif /* ! HAVE_EVIL */
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#include "embryo_cc_prefix.h"
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/* local subsystem functions */
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static int _e_prefix_share_hunt(void);
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static int _e_prefix_fallbacks(void);
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static int _e_prefix_try_proc(void);
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static int _e_prefix_try_argv(char *argv0);
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/* local subsystem globals */
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static char *_exe_path = NULL;
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static char *_prefix_path = NULL;
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static char *_prefix_path_bin = NULL;
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static char *_prefix_path_data = NULL;
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static char *_prefix_path_lib = NULL;
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#define E_FREE(p) { if (p) {free(p); p = NULL;} }
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/*#define PREFIX_CACHE_FILE 1*/
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#define SHARE_D "share/embryo"
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#define MAGIC_FILE "include/default.inc"
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#define MAGIC_DAT SHARE_D"/"MAGIC_FILE
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/* externally accessible functions */
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int
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e_prefix_determine(char *argv0)
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{
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char *p, buf[4096];
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struct stat st;
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e_prefix_shutdown();
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/* if user provides E_PREFIX - then use that or also more specific sub
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* dirs for bin, lib, data and locale */
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if (getenv("EMBRYO_PREFIX"))
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{
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_prefix_path = strdup(getenv("EMBRYO_PREFIX"));
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if (getenv("EMBRYO_BIN_DIR"))
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snprintf(buf, sizeof(buf), "%s/bin", getenv("EMBRYO_BIN_DIR"));
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else
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snprintf(buf, sizeof(buf), "%s/bin", _prefix_path);
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_prefix_path_bin = strdup(buf);
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if (getenv("EMBRYO_LIB_DIR"))
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snprintf(buf, sizeof(buf), "%s/lib", getenv("EMBRYO_LIB_DIR"));
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else
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snprintf(buf, sizeof(buf), "%s/lib", _prefix_path);
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_prefix_path_lib = strdup(buf);
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if (getenv("EMBRYO_DATA_DIR"))
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snprintf(buf, sizeof(buf), "%s/"SHARE_D, getenv("EMBRYO_DATA_DIR"));
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else
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snprintf(buf, sizeof(buf), "%s/"SHARE_D, _prefix_path);
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_prefix_path_data = strdup(buf);
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return 1;
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}
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/* no env var - examine process and possible argv0 */
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if (!_e_prefix_try_proc())
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{
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if (!_e_prefix_try_argv(argv0))
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{
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_e_prefix_fallbacks();
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return 0;
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}
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}
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/* _exe_path is now a full absolute path TO this exe - figure out rest */
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/* if
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* exe = /blah/whatever/bin/exe
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* then
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* prefix = /blah/whatever
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* bin_dir = /blah/whatever/bin
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* data_dir = /blah/whatever/share/enlightenment
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* lib_dir = /blah/whatever/lib
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*/
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p = strrchr(_exe_path, '/');
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if (p)
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{
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p--;
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while (p >= _exe_path)
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{
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if (*p == '/')
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{
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_prefix_path = malloc(p - _exe_path + 1);
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if (_prefix_path)
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{
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strncpy(_prefix_path, _exe_path, p - _exe_path);
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_prefix_path[p - _exe_path] = 0;
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/* bin and lib always together */
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snprintf(buf, sizeof(buf), "%s/bin", _prefix_path);
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_prefix_path_bin = strdup(buf);
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snprintf(buf, sizeof(buf), "%s/lib", _prefix_path);
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_prefix_path_lib = strdup(buf);
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/* check if AUTHORS file is there - then our guess is right */
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snprintf(buf, sizeof(buf), "%s/"MAGIC_DAT, _prefix_path);
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if (stat(buf, &st) == 0)
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{
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snprintf(buf, sizeof(buf), "%s/"SHARE_D, _prefix_path);
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_prefix_path_data = strdup(buf);
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}
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/* AUTHORS file not there. time to start hunting! */
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else
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{
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if (_e_prefix_share_hunt())
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{
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return 1;
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}
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else
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{
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e_prefix_fallback();
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return 0;
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}
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}
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return 1;
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}
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else
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{
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e_prefix_fallback();
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return 0;
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}
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}
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p--;
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}
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}
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e_prefix_fallback();
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return 0;
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}
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void
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e_prefix_shutdown(void)
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{
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E_FREE(_exe_path);
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E_FREE(_prefix_path);
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E_FREE(_prefix_path_bin);
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E_FREE(_prefix_path_data);
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E_FREE(_prefix_path_lib);
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}
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void
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e_prefix_fallback(void)
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{
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e_prefix_shutdown();
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_e_prefix_fallbacks();
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}
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const char *
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e_prefix_get(void)
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{
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return _prefix_path;
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}
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const char *
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e_prefix_bin_get(void)
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{
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return _prefix_path_bin;
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}
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const char *
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e_prefix_data_get(void)
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{
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return _prefix_path_data;
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}
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const char *
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e_prefix_lib_get(void)
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{
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return _prefix_path_lib;
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}
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/* local subsystem functions */
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static int
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_e_prefix_share_hunt(void)
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{
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char buf[4096], buf2[4096], *p;
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struct stat st;
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/* sometimes this isnt the case - so we need to do a more exhaustive search
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* through more parent and subdirs. hre is an example i have seen:
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*
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* /blah/whatever/exec/bin/exe
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* ->
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* /blah/whatever/exec/bin
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* /blah/whatever/common/share/enlightenment
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* /blah/whatever/exec/lib
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*/
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/* this is pure black magic to try and find data shares */
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/* 2. cache file doesn't exist or is invalid - we need to search - this is
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* where the real black magic begins */
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/* BLACK MAGIC 1:
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* /blah/whatever/dir1/bin
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* /blah/whatever/dir2/share/enlightenment
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*/
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if (!_prefix_path_data)
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{
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DIR *dirp;
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struct dirent *dp;
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snprintf(buf, sizeof(buf), "%s", _prefix_path);
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p = strrchr(buf, '/');
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if (p) *p = 0;
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dirp = opendir(buf);
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if (dirp)
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{
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char *file;
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while ((dp = readdir(dirp)))
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{
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if ((strcmp(dp->d_name, ".")) && (strcmp(dp->d_name, "..")))
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{
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file = dp->d_name;
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snprintf(buf2, sizeof(buf2), "%s/%s/"MAGIC_DAT, buf, file);
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if (stat(buf2, &st) == 0)
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{
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snprintf(buf2, sizeof(buf2), "%s/%s/"SHARE_D, buf, file);
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_prefix_path_data = strdup(buf2);
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break;
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}
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}
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}
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closedir(dirp);
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}
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}
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/* BLACK MAGIC 2:
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* /blah/whatever/dir1/bin
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* /blah/whatever/share/enlightenment
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*/
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if (!_prefix_path_data)
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{
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snprintf(buf, sizeof(buf), "%s", _prefix_path);
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p = strrchr(buf, '/');
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if (p) *p = 0;
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snprintf(buf2, sizeof(buf2), "%s/"MAGIC_DAT, buf);
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if (stat(buf, &st) == 0)
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{
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snprintf(buf2, sizeof(buf2), "%s/"SHARE_D, buf);
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_prefix_path_data = strdup(buf2);
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}
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}
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/* add more black magic as required as we discover weridnesss - remember
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* this is to save users having to set environment variables to tell
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* e where it lives, so e auto-adapts. so these code snippets are just
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* logic to figure that out for the user
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*/
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/* done. we found it - write cache file */
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if (_prefix_path_data)
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{
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return 1;
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}
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/* fail. everything failed */
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return 0;
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}
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static int
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_e_prefix_fallbacks(void)
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{
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char *p;
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_prefix_path = strdup(PACKAGE_BIN_DIR);
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p = strrchr(_prefix_path, '/');
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if (p) *p = 0;
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_prefix_path_bin = strdup(PACKAGE_BIN_DIR);
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_prefix_path_data = strdup(PACKAGE_DATA_DIR);
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_prefix_path_lib = strdup(PACKAGE_LIB_DIR);
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printf("WARNING: Embryo could not determine its installed prefix\n"
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" and is falling back on the compiled in default:\n"
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" %s\n"
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" You might like to try setting the following environment variables:\n"
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" EMBRYO_PREFIX - points to the base prefix of install\n"
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" EMBRYO_BIN_DIR - optional in addition to E_PREFIX to provide\n"
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" a more specific binary directory\n"
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" EMBRYO_LIB_DIR - optional in addition to E_PREFIX to provide\n"
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" a more specific library dir\n"
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" EMBRYO_DATA_DIR - optional in addition to E_PREFIX to provide\n"
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" a more specific location for shared data\n"
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,
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_prefix_path);
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return 1;
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}
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static int
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_e_prefix_try_proc(void)
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{
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FILE *f;
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char buf[4096];
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void *func = NULL;
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func = (void *)_e_prefix_try_proc;
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f = fopen("/proc/self/maps", "r");
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if (!f) return 0;
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while (fgets(buf, sizeof(buf), f))
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{
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int len;
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char *p, mode[5] = "";
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unsigned long ptr1 = 0, ptr2 = 0;
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len = strlen(buf);
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if (buf[len - 1] == '\n')
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{
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buf[len - 1] = 0;
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len--;
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}
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if (sscanf(buf, "%lx-%lx %4s", &ptr1, &ptr2, mode) == 3)
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{
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if (!strcmp(mode, "r-xp"))
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{
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if (((void *)ptr1 <= func) && (func < (void *)ptr2))
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{
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p = strchr(buf, '/');
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if (p)
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{
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if (len > 10)
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{
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if (!strcmp(buf + len - 10, " (deleted)"))
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buf[len - 10] = 0;
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}
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_exe_path = strdup(p);
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fclose(f);
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return 1;
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}
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else
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break;
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}
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}
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}
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}
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fclose(f);
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return 0;
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}
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static int
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_e_prefix_try_argv(char *argv0)
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{
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char *path, *p, *cp, *s;
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int len, lenexe;
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char buf[4096], buf2[4096], buf3[4096];
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/* 1. is argv0 abs path? */
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if (argv0[0] == '/')
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{
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_exe_path = strdup(argv0);
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if (access(_exe_path, X_OK) == 0) return 1;
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free(_exe_path);
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_exe_path = NULL;
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return 0;
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}
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/* 2. relative path */
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if (strchr(argv0, '/'))
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{
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if (getcwd(buf3, sizeof(buf3)))
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{
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snprintf(buf2, sizeof(buf2), "%s/%s", buf3, argv0);
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if (realpath(buf2, buf))
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{
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_exe_path = strdup(buf);
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if (access(_exe_path, X_OK) == 0) return 1;
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free(_exe_path);
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_exe_path = NULL;
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}
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}
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}
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/* 3. argv0 no path - look in PATH */
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path = getenv("PATH");
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if (!path) return 0;
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p = path;
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cp = p;
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lenexe = strlen(argv0);
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while ((p = strchr(cp, ':')))
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{
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len = p - cp;
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s = malloc(len + 1 + lenexe + 1);
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if (s)
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{
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strncpy(s, cp, len);
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s[len] = '/';
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strcpy(s + len + 1, argv0);
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if (realpath(s, buf))
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{
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if (access(buf, X_OK) == 0)
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{
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_exe_path = strdup(buf);
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free(s);
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return 1;
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}
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}
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free(s);
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}
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cp = p + 1;
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}
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len = strlen(cp);
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s = malloc(len + 1 + lenexe + 1);
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if (s)
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{
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strncpy(s, cp, len);
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s[len] = '/';
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strcpy(s + len + 1, argv0);
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if (realpath(s, buf))
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{
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if (access(buf, X_OK) == 0)
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{
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_exe_path = strdup(buf);
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free(s);
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return 1;
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}
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}
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free(s);
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}
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/* 4. big problems. arg[0] != executable - weird execution */
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return 0;
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}
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