mirror of https://github.com/GNOME/gimp.git
698 lines
22 KiB
C
698 lines
22 KiB
C
/*
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* BinReloc - a library for creating relocatable executables
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* Written by: Hongli Lai <h.lai@chello.nl>
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* http://autopackage.org/
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*
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* This source code is public domain. You can relicense this code
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* under whatever license you want.
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*
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* See http://autopackage.org/docs/binreloc/ for
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* more information and how to use this.
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*/
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#include "config.h"
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#include <stdlib.h>
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#include <limits.h>
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#include <string.h>
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#ifdef ENABLE_BINRELOC
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#endif /* ENABLE_BINRELOC */
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#include <glib.h>
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#include <glib/gstdio.h>
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#include "gimpreloc.h"
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/*
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* Find the canonical filename of the executable. Returns the filename
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* (which must be freed) or NULL on error. If the parameter 'error' is
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* not NULL, the error code will be stored there, if an error occured.
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*/
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static char *
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_br_find_exe (GimpBinrelocInitError *error)
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{
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#ifndef ENABLE_BINRELOC
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if (error)
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*error = GIMP_RELOC_INIT_ERROR_DISABLED;
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return NULL;
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#else
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char *path, *path2, *line, *result;
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size_t buf_size;
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ssize_t size;
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struct stat stat_buf;
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FILE *f;
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/* Read from /proc/self/exe (symlink) */
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if (sizeof (path) > SSIZE_MAX)
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buf_size = SSIZE_MAX - 1;
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else
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buf_size = PATH_MAX - 1;
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path = g_try_new (char, buf_size);
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if (path == NULL) {
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/* Cannot allocate memory. */
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if (error)
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*error = GIMP_RELOC_INIT_ERROR_NOMEM;
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return NULL;
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}
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path2 = g_try_new (char, buf_size);
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if (path2 == NULL) {
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/* Cannot allocate memory. */
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if (error)
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*error = GIMP_RELOC_INIT_ERROR_NOMEM;
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g_free (path);
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return NULL;
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}
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strncpy (path2, "/proc/self/exe", buf_size - 1);
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while (1) {
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int i;
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size = readlink (path2, path, buf_size - 1);
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if (size == -1) {
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/* Error. */
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g_free (path2);
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break;
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}
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/* readlink() success. */
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path[size] = '\0';
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/* Check whether the symlink's target is also a symlink.
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* We want to get the final target. */
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i = stat (path, &stat_buf);
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if (i == -1) {
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/* Error. */
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g_free (path2);
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break;
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}
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/* stat() success. */
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if (!S_ISLNK (stat_buf.st_mode)) {
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/* path is not a symlink. Done. */
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g_free (path2);
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return path;
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}
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/* path is a symlink. Continue loop and resolve this. */
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strncpy (path, path2, buf_size - 1);
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}
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/* readlink() or stat() failed; this can happen when the program is
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* running in Valgrind 2.2. Read from /proc/self/maps as fallback. */
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buf_size = PATH_MAX + 128;
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line = (char *) g_try_realloc (path, buf_size);
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if (line == NULL) {
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/* Cannot allocate memory. */
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g_free (path);
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if (error)
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*error = GIMP_RELOC_INIT_ERROR_NOMEM;
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return NULL;
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}
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f = g_fopen ("/proc/self/maps", "r");
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if (f == NULL) {
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g_free (line);
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if (error)
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*error = GIMP_RELOC_INIT_ERROR_OPEN_MAPS;
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return NULL;
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}
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/* The first entry should be the executable name. */
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result = fgets (line, (int) buf_size, f);
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if (result == NULL) {
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fclose (f);
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g_free (line);
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if (error)
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*error = GIMP_RELOC_INIT_ERROR_READ_MAPS;
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return NULL;
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}
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/* Get rid of newline character. */
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buf_size = strlen (line);
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if (buf_size <= 0) {
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/* Huh? An empty string? */
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fclose (f);
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g_free (line);
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if (error)
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*error = GIMP_RELOC_INIT_ERROR_INVALID_MAPS;
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return NULL;
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}
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if (line[buf_size - 1] == 10)
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line[buf_size - 1] = 0;
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/* Extract the filename; it is always an absolute path. */
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path = strchr (line, '/');
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/* Sanity check. */
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if (strstr (line, " r-xp ") == NULL || path == NULL) {
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fclose (f);
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g_free (line);
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if (error)
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*error = GIMP_RELOC_INIT_ERROR_INVALID_MAPS;
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return NULL;
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}
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path = g_strdup (path);
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g_free (line);
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fclose (f);
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return path;
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#endif /* ENABLE_BINRELOC */
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}
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/*
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* Find the canonical filename of the executable which owns symbol.
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* Returns a filename which must be freed, or NULL on error.
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*/
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static char *
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_br_find_exe_for_symbol (const void *symbol, GimpBinrelocInitError *error)
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{
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#ifndef ENABLE_BINRELOC
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if (error)
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*error = GIMP_RELOC_INIT_ERROR_DISABLED;
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return (char *) NULL;
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#else
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#define SIZE PATH_MAX + 100
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FILE *f;
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size_t address_string_len;
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char *address_string, line[SIZE], *found;
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if (symbol == NULL)
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return (char *) NULL;
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f = g_fopen ("/proc/self/maps", "r");
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if (f == NULL)
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return (char *) NULL;
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address_string_len = 4;
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address_string = g_try_new (char, address_string_len);
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found = (char *) NULL;
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while (!feof (f)) {
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char *start_addr, *end_addr, *end_addr_end, *file;
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void *start_addr_p, *end_addr_p;
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size_t len;
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if (fgets (line, SIZE, f) == NULL)
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break;
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/* Sanity check. */
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if (strstr (line, " r-xp ") == NULL || strchr (line, '/') == NULL)
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continue;
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/* Parse line. */
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start_addr = line;
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end_addr = strchr (line, '-');
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file = strchr (line, '/');
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/* More sanity check. */
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if (!(file > end_addr && end_addr != NULL && end_addr[0] == '-'))
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continue;
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end_addr[0] = '\0';
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end_addr++;
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end_addr_end = strchr (end_addr, ' ');
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if (end_addr_end == NULL)
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continue;
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end_addr_end[0] = '\0';
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len = strlen (file);
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if (len == 0)
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continue;
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if (file[len - 1] == '\n')
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file[len - 1] = '\0';
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/* Get rid of "(deleted)" from the filename. */
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len = strlen (file);
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if (len > 10 && strcmp (file + len - 10, " (deleted)") == 0)
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file[len - 10] = '\0';
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/* I don't know whether this can happen but better safe than sorry. */
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len = strlen (start_addr);
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if (len != strlen (end_addr))
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continue;
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/* Transform the addresses into a string in the form of 0xdeadbeef,
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* then transform that into a pointer. */
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if (address_string_len < len + 3) {
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address_string_len = len + 3;
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address_string = (char *) g_try_realloc (address_string, address_string_len);
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}
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memcpy (address_string, "0x", 2);
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memcpy (address_string + 2, start_addr, len);
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address_string[2 + len] = '\0';
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sscanf (address_string, "%p", &start_addr_p);
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memcpy (address_string, "0x", 2);
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memcpy (address_string + 2, end_addr, len);
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address_string[2 + len] = '\0';
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sscanf (address_string, "%p", &end_addr_p);
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if (symbol >= start_addr_p && symbol < end_addr_p) {
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found = file;
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break;
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}
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}
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g_free (address_string);
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fclose (f);
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if (found == NULL)
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return (char *) NULL;
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else
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return g_strdup (found);
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#endif /* ENABLE_BINRELOC */
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}
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static gchar *exe = NULL;
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static void set_gerror (GError **error, GimpBinrelocInitError errcode);
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/* Initialize the BinReloc library (for applications).
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*
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* This function must be called before using any other BinReloc functions.
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* It attempts to locate the application's canonical filename.
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*
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* @note If you want to use BinReloc for a library, then you should call
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* _gimp_reloc_init_lib() instead.
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* @note Initialization failure is not fatal. BinReloc functions will just
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* fallback to the supplied default path.
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*
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* @param error If BinReloc failed to initialize, then the error report will
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* be stored in this variable. Set to NULL if you don't want an
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* error report. See the #GimpBinrelocInitError for a list of error
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* codes.
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*
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* @returns TRUE on success, FALSE if BinReloc failed to initialize.
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*/
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gboolean
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_gimp_reloc_init (GError **error)
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{
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GimpBinrelocInitError errcode;
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/* Shut up compiler warning about uninitialized variable. */
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errcode = GIMP_RELOC_INIT_ERROR_NOMEM;
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/* Locate the application's filename. */
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exe = _br_find_exe (&errcode);
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if (exe != NULL)
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/* Success! */
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return TRUE;
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else {
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/* Failed :-( */
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set_gerror (error, errcode);
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return FALSE;
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}
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}
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/* Initialize the BinReloc library (for libraries).
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*
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* This function must be called before using any other BinReloc functions.
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* It attempts to locate the calling library's canonical filename.
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*
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* @note The BinReloc source code MUST be included in your library, or this
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* function won't work correctly.
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* @note Initialization failure is not fatal. BinReloc functions will just
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* fallback to the supplied default path.
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*
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* @returns TRUE on success, FALSE if a filename cannot be found.
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*/
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gboolean
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_gimp_reloc_init_lib (GError **error)
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{
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GimpBinrelocInitError errcode;
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/* Shut up compiler warning about uninitialized variable. */
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errcode = GIMP_RELOC_INIT_ERROR_NOMEM;
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exe = _br_find_exe_for_symbol ((const void *) "", &errcode);
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if (exe != NULL)
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/* Success! */
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return TRUE;
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else {
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/* Failed :-( */
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set_gerror (error, errcode);
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return exe != NULL;
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}
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}
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static void
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set_gerror (GError **error, GimpBinrelocInitError errcode)
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{
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const gchar *error_message;
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if (error == NULL)
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return;
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switch (errcode) {
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case GIMP_RELOC_INIT_ERROR_NOMEM:
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error_message = "Cannot allocate memory.";
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break;
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case GIMP_RELOC_INIT_ERROR_OPEN_MAPS:
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error_message = "Unable to open /proc/self/maps for reading.";
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break;
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case GIMP_RELOC_INIT_ERROR_READ_MAPS:
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error_message = "Unable to read from /proc/self/maps.";
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break;
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case GIMP_RELOC_INIT_ERROR_INVALID_MAPS:
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error_message = "The file format of /proc/self/maps is invalid.";
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break;
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case GIMP_RELOC_INIT_ERROR_DISABLED:
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error_message = "Binary relocation support is disabled.";
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break;
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default:
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error_message = "Unknown error.";
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break;
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};
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g_set_error (error, g_quark_from_static_string ("GBinReloc"),
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errcode, "%s", error_message);
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}
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/* Find the canonical filename of the current application.
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*
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* @param default_exe A default filename which will be used as fallback.
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* @returns A string containing the application's canonical filename,
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* which must be freed when no longer necessary. If BinReloc is
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* not initialized, or if the initialization function failed,
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* then a copy of default_exe will be returned. If default_exe
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* is NULL, then NULL will be returned.
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*/
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gchar *
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_gimp_reloc_find_exe (const gchar *default_exe)
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{
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if (exe == NULL) {
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/* BinReloc is not initialized. */
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if (default_exe != NULL)
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return g_strdup (default_exe);
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else
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return NULL;
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}
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return g_strdup (exe);
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}
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/* Locate the directory in which the current application is installed.
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*
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* The prefix is generated by the following pseudo-code evaluation:
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* \code
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* dirname(exename)
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* \endcode
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*
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* @param default_dir A default directory which will used as fallback.
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* @return A string containing the directory, which must be freed when no
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* longer necessary. If BinReloc is not initialized, or if the
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* initialization function failed, then a copy of default_dir
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* will be returned. If default_dir is NULL, then NULL will be
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* returned.
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*/
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gchar *
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_gimp_reloc_find_exe_dir (const gchar *default_dir)
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{
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if (exe == NULL) {
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/* BinReloc not initialized. */
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if (default_dir != NULL)
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return g_strdup (default_dir);
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else
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return NULL;
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}
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return g_path_get_dirname (exe);
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}
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/* Locate the prefix in which the current application is installed.
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*
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* The prefix is generated by the following pseudo-code evaluation:
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* \code
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* dirname(dirname(exename))
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* \endcode
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*
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* @param default_prefix A default prefix which will used as fallback.
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* @return A string containing the prefix, which must be freed when no
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* longer necessary. If BinReloc is not initialized, or if the
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* initialization function failed, then a copy of default_prefix
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* will be returned. If default_prefix is NULL, then NULL will be
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* returned.
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*/
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gchar *
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_gimp_reloc_find_prefix (const gchar *default_prefix)
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{
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gchar *dir1, *dir2;
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if (exe == NULL) {
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/* BinReloc not initialized. */
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if (default_prefix != NULL)
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return g_strdup (default_prefix);
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else
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return NULL;
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}
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dir1 = g_path_get_dirname (exe);
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dir2 = g_path_get_dirname (dir1);
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g_free (dir1);
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return dir2;
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}
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/* Locate the application's binary folder.
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*
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* The path is generated by the following pseudo-code evaluation:
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* \code
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* prefix + "/bin"
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* \endcode
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*
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* @param default_bin_dir A default path which will used as fallback.
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* @return A string containing the bin folder's path, which must be freed when
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* no longer necessary. If BinReloc is not initialized, or if the
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* initialization function failed, then a copy of default_bin_dir will
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* be returned. If default_bin_dir is NULL, then NULL will be returned.
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*/
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gchar *
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_gimp_reloc_find_bin_dir (const gchar *default_bin_dir)
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{
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gchar *prefix, *dir;
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prefix = _gimp_reloc_find_prefix (NULL);
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if (prefix == NULL) {
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/* BinReloc not initialized. */
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if (default_bin_dir != NULL)
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return g_strdup (default_bin_dir);
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else
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return NULL;
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}
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dir = g_build_filename (prefix, "bin", NULL);
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g_free (prefix);
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return dir;
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}
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/* Locate the application's data folder.
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*
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* The path is generated by the following pseudo-code evaluation:
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* \code
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* prefix + "/share/" + GIMP_PACKAGE + "/" + GIMP_DATA_VERSION
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* \endcode
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*
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* @param default_data_dir A default path which will used as fallback.
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* @return A string containing the data folder's path, which must be freed when
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* no longer necessary. If BinReloc is not initialized, or if the
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* initialization function failed, then a copy of default_data_dir
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* will be returned. If default_data_dir is NULL, then NULL will be
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* returned.
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*/
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gchar *
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_gimp_reloc_find_data_dir (const gchar *default_data_dir)
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{
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gchar *prefix, *dir;
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prefix = _gimp_reloc_find_prefix (NULL);
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if (prefix == NULL) {
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/* BinReloc not initialized. */
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if (default_data_dir != NULL)
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return g_strdup (default_data_dir);
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else
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return NULL;
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}
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dir = g_build_filename (prefix, "share",
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GIMP_PACKAGE,
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GIMP_DATA_VERSION,
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NULL);
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g_free (prefix);
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return dir;
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}
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gchar *
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_gimp_reloc_find_plugin_dir (const gchar *default_plugin_dir)
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{
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gchar *libdir, *dir;
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libdir = _gimp_reloc_find_lib_dir (NULL);
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if (libdir == NULL) {
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|
/* BinReloc not initialized. */
|
|
if (default_plugin_dir != NULL)
|
|
return g_strdup (default_plugin_dir);
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
dir = g_build_filename (libdir,
|
|
GIMP_PACKAGE,
|
|
GIMP_PLUGIN_VERSION,
|
|
NULL);
|
|
g_free (libdir);
|
|
return dir;
|
|
}
|
|
|
|
|
|
/* Locate the application's localization folder.
|
|
*
|
|
* The path is generated by the following pseudo-code evaluation:
|
|
* \code
|
|
* prefix + "/share/locale"
|
|
* \endcode
|
|
*
|
|
* @param default_locale_dir A default path which will used as fallback.
|
|
* @return A string containing the localization folder's path, which must be freed when
|
|
* no longer necessary. If BinReloc is not initialized, or if the
|
|
* initialization function failed, then a copy of default_locale_dir will be returned.
|
|
* If default_locale_dir is NULL, then NULL will be returned.
|
|
*/
|
|
gchar *
|
|
_gimp_reloc_find_locale_dir (const gchar *default_locale_dir)
|
|
{
|
|
gchar *data_dir, *dir;
|
|
|
|
data_dir = _gimp_reloc_find_data_dir (NULL);
|
|
if (data_dir == NULL) {
|
|
/* BinReloc not initialized. */
|
|
if (default_locale_dir != NULL)
|
|
return g_strdup (default_locale_dir);
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
dir = g_build_filename (data_dir, "locale", NULL);
|
|
g_free (data_dir);
|
|
return dir;
|
|
}
|
|
|
|
|
|
/* Locate the application's library folder.
|
|
*
|
|
* The path is generated by the following pseudo-code evaluation:
|
|
* \code
|
|
* prefix + "/lib"
|
|
* \endcode
|
|
*
|
|
* @param default_lib_dir A default path which will used as fallback.
|
|
* @return A string containing the library folder's path, which must be freed when
|
|
* no longer necessary. If BinReloc is not initialized, or if the
|
|
* initialization function failed, then a copy of default_lib_dir will be returned.
|
|
* If default_lib_dir is NULL, then NULL will be returned.
|
|
*/
|
|
gchar *
|
|
_gimp_reloc_find_lib_dir (const gchar *default_lib_dir)
|
|
{
|
|
gchar *prefix, *dir;
|
|
|
|
prefix = _gimp_reloc_find_prefix (NULL);
|
|
if (prefix == NULL) {
|
|
/* BinReloc not initialized. */
|
|
if (default_lib_dir != NULL)
|
|
return g_strdup (default_lib_dir);
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
dir = g_build_filename (prefix, "lib", NULL);
|
|
g_free (prefix);
|
|
return dir;
|
|
}
|
|
|
|
|
|
/* Locate the application's libexec folder.
|
|
*
|
|
* The path is generated by the following pseudo-code evaluation:
|
|
* \code
|
|
* prefix + "/libexec"
|
|
* \endcode
|
|
*
|
|
* @param default_libexec_dir A default path which will used as fallback.
|
|
* @return A string containing the libexec folder's path, which must be freed when
|
|
* no longer necessary. If BinReloc is not initialized, or if the initialization
|
|
* function failed, then a copy of default_libexec_dir will be returned.
|
|
* If default_libexec_dir is NULL, then NULL will be returned.
|
|
*/
|
|
gchar *
|
|
_gimp_reloc_find_libexec_dir (const gchar *default_libexec_dir)
|
|
{
|
|
gchar *prefix, *dir;
|
|
|
|
prefix = _gimp_reloc_find_prefix (NULL);
|
|
if (prefix == NULL) {
|
|
/* BinReloc not initialized. */
|
|
if (default_libexec_dir != NULL)
|
|
return g_strdup (default_libexec_dir);
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
dir = g_build_filename (prefix, "libexec", NULL);
|
|
g_free (prefix);
|
|
return dir;
|
|
}
|
|
|
|
|
|
/* Locate the application's configuration files folder.
|
|
*
|
|
* The path is generated by the following pseudo-code evaluation:
|
|
* \code
|
|
* prefix + "/etc/" + GIMP_PACKAGE + "/" + GIMP_SYSCONF_VERSION
|
|
* \endcode
|
|
*
|
|
* @param default_etc_dir A default path which will used as fallback.
|
|
* @return A string containing the etc folder's path, which must be freed when
|
|
* no longer necessary. If BinReloc is not initialized, or if the
|
|
* initialization function failed, then a copy of default_etc_dir
|
|
* will be returned. If default_etc_dir is NULL, then NULL will be
|
|
* returned.
|
|
*/
|
|
gchar *
|
|
_gimp_reloc_find_etc_dir (const gchar *default_etc_dir)
|
|
{
|
|
gchar *prefix, *dir;
|
|
|
|
prefix = _gimp_reloc_find_prefix (NULL);
|
|
if (prefix == NULL) {
|
|
/* BinReloc not initialized. */
|
|
if (default_etc_dir != NULL)
|
|
return g_strdup (default_etc_dir);
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
dir = g_build_filename (prefix, "etc",
|
|
GIMP_PACKAGE,
|
|
GIMP_SYSCONF_VERSION,
|
|
NULL);
|
|
g_free (prefix);
|
|
return dir;
|
|
}
|