2006-10-20 22:57:27 -07:00
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#include "config.h"
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2006-03-04 22:23:14 -08:00
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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2006-10-20 22:57:27 -07:00
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#ifdef HAVE_ALLOCA_H
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#include <alloca.h>
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#endif
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2006-03-04 22:23:14 -08:00
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static void env_set(const char *var, const char *val);
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static int prefix_determine(char *argv0);
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static void
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env_set(const char *var, const char *val)
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{
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if (val)
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{
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#ifdef HAVE_SETENV
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setenv(var, val, 1);
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#else
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2006-10-20 22:57:27 -07:00
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char *buf;
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2006-03-04 22:23:14 -08:00
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2006-10-20 22:57:27 -07:00
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buf = alloca(strlen(var) + 1 + strlen(val) + 1);
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2006-03-04 22:23:14 -08:00
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snprintf(buf, sizeof(buf), "%s=%s", var, val);
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if (getenv(var))
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putenv(buf);
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else
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putenv(strdup(buf));
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#endif
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}
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else
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{
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#ifdef HAVE_UNSETENV
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unsetenv(var);
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#else
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if (getenv(var)) putenv(var);
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#endif
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}
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}
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/* local subsystem functions */
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static int _prefix_fallbacks(void);
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static int _prefix_try_proc(void);
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static int _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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/* externally accessible functions */
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static int
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prefix_determine(char *argv0)
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{
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char *p;
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if (!_prefix_try_proc())
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{
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if (!_prefix_try_argv(argv0))
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{
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_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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*/
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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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return 1;
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}
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else
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{
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free(_exe_path);
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_exe_path = NULL;
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_prefix_fallbacks();
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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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free(_exe_path);
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_exe_path = NULL;
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_prefix_fallbacks();
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return 0;
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}
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static int
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_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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printf("WARNING: Enlightenment 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", _prefix_path);
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return 1;
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}
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static int
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_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 *)_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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_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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#ifdef PATH_MAX
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char buf[PATH_MAX], buf2[PATH_MAX], buf3[PATH_MAX];
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#else
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char buf[4096], buf2[4096], buf3[4096];
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#endif
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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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int
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main(int argc, char **argv)
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{
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int i;
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2006-10-20 22:57:27 -07:00
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char buf[16384], **args, *p;
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2006-03-04 22:23:14 -08:00
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prefix_determine(argv[0]);
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2006-10-20 22:57:27 -07:00
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env_set("E_START", argv[0]);
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2006-03-04 22:23:14 -08:00
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p = getenv("PATH");
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2006-10-20 22:57:27 -07:00
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if (p) snprintf(buf, sizeof(buf), "%s/bin:%s", _prefix_path, p);
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else snprintf(buf, sizeof(buf), "%s/bin", _prefix_path);
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2006-03-04 22:23:14 -08:00
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env_set("PATH", buf);
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p = getenv("LD_LIBRARY_PATH");
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2006-10-20 22:57:27 -07:00
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if (p) snprintf(buf, sizeof(buf), "%s/lib:%s", _prefix_path, p);
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else snprintf(buf, sizeof(buf), "%s/lib", _prefix_path);
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2006-03-04 22:23:14 -08:00
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env_set("LD_LIBRARY_PATH", buf);
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2006-10-20 22:57:27 -07:00
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args = alloca((argc + 1) * sizeof(char *));
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2006-03-04 22:23:14 -08:00
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args[0] = "enlightenment";
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2006-10-20 22:57:27 -07:00
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for (i = 1; i < argc; i++) args[i] = argv[i];
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2006-03-04 22:23:14 -08:00
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args[i] = NULL;
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snprintf(buf, sizeof(buf), "%s/bin/enlightenment", _prefix_path);
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2006-10-20 22:57:27 -07:00
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execv(buf, args);
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perror("execv");
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return -1;
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2006-03-04 22:23:14 -08:00
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}
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