/* gfileutils.c - File utility functions * * Copyright 2000 Red Hat, Inc. * * GLib is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as * published by the Free Software Foundation; either version 2 of the * License, or (at your option) any later version. * * GLib is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with GLib; see the file COPYING.LIB. If not, * write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #include "config.h" #include "glib.h" #include #ifdef HAVE_UNISTD_H #include #endif #include #include #include #include #include #include #include #include #include #ifdef G_OS_WIN32 #include #include #endif /* G_OS_WIN32 */ #ifndef S_ISLNK #define S_ISLNK(x) 0 #endif #ifndef O_BINARY #define O_BINARY 0 #endif #include "gstdio.h" #include "glibintl.h" #include "galias.h" static gint create_temp_file (gchar *tmpl, int permissions); /** * g_mkdir_with_parents: * @pathname: a pathname in the GLib file name encoding * @mode: permissions to use for newly created directories * * Create a directory if it doesn't already exist. Create intermediate * parent directories as needed, too. * * Returns: 0 if the directory already exists, or was successfully * created. Returns -1 if an error occurred, with errno set. * * Since: 2.8 */ int g_mkdir_with_parents (const gchar *pathname, int mode) { gchar *fn, *p; if (pathname == NULL || *pathname == '\0') { errno = EINVAL; return -1; } fn = g_strdup (pathname); if (g_path_is_absolute (fn)) p = (gchar *) g_path_skip_root (fn); else p = fn; do { while (*p && !G_IS_DIR_SEPARATOR (*p)) p++; if (!*p) p = NULL; else *p = '\0'; if (!g_file_test (fn, G_FILE_TEST_EXISTS)) { if (g_mkdir (fn, mode) == -1) { int errno_save = errno; g_free (fn); errno = errno_save; return -1; } } else if (!g_file_test (fn, G_FILE_TEST_IS_DIR)) { g_free (fn); errno = ENOTDIR; return -1; } if (p) { *p++ = G_DIR_SEPARATOR; while (*p && G_IS_DIR_SEPARATOR (*p)) p++; } } while (p); g_free (fn); return 0; } /** * g_file_test: * @filename: a filename to test in the GLib file name encoding * @test: bitfield of #GFileTest flags * * Returns %TRUE if any of the tests in the bitfield @test are * %TRUE. For example, (G_FILE_TEST_EXISTS | * G_FILE_TEST_IS_DIR) will return %TRUE if the file exists; * the check whether it's a directory doesn't matter since the existence * test is %TRUE. With the current set of available tests, there's no point * passing in more than one test at a time. * * Apart from %G_FILE_TEST_IS_SYMLINK all tests follow symbolic links, * so for a symbolic link to a regular file g_file_test() will return * %TRUE for both %G_FILE_TEST_IS_SYMLINK and %G_FILE_TEST_IS_REGULAR. * * Note, that for a dangling symbolic link g_file_test() will return * %TRUE for %G_FILE_TEST_IS_SYMLINK and %FALSE for all other flags. * * You should never use g_file_test() to test whether it is safe * to perform an operation, because there is always the possibility * of the condition changing before you actually perform the operation. * For example, you might think you could use %G_FILE_TEST_IS_SYMLINK * to know whether it is safe to write to a file without being * tricked into writing into a different location. It doesn't work! * |[ * /* DON'T DO THIS */ * if (!g_file_test (filename, G_FILE_TEST_IS_SYMLINK)) * { * fd = g_open (filename, O_WRONLY); * /* write to fd */ * } * ]| * * Another thing to note is that %G_FILE_TEST_EXISTS and * %G_FILE_TEST_IS_EXECUTABLE are implemented using the access() * system call. This usually doesn't matter, but if your program * is setuid or setgid it means that these tests will give you * the answer for the real user ID and group ID, rather than the * effective user ID and group ID. * * On Windows, there are no symlinks, so testing for * %G_FILE_TEST_IS_SYMLINK will always return %FALSE. Testing for * %G_FILE_TEST_IS_EXECUTABLE will just check that the file exists and * its name indicates that it is executable, checking for well-known * extensions and those listed in the %PATHEXT environment variable. * * Return value: whether a test was %TRUE **/ gboolean g_file_test (const gchar *filename, GFileTest test) { #ifdef G_OS_WIN32 /* stuff missing in std vc6 api */ # ifndef INVALID_FILE_ATTRIBUTES # define INVALID_FILE_ATTRIBUTES -1 # endif # ifndef FILE_ATTRIBUTE_DEVICE # define FILE_ATTRIBUTE_DEVICE 64 # endif int attributes; wchar_t *wfilename = g_utf8_to_utf16 (filename, -1, NULL, NULL, NULL); if (wfilename == NULL) return FALSE; attributes = GetFileAttributesW (wfilename); g_free (wfilename); if (attributes == INVALID_FILE_ATTRIBUTES) return FALSE; if (test & G_FILE_TEST_EXISTS) return TRUE; if (test & G_FILE_TEST_IS_REGULAR) return (attributes & (FILE_ATTRIBUTE_DIRECTORY | FILE_ATTRIBUTE_DEVICE)) == 0; if (test & G_FILE_TEST_IS_DIR) return (attributes & FILE_ATTRIBUTE_DIRECTORY) != 0; if (test & G_FILE_TEST_IS_EXECUTABLE) { const gchar *lastdot = strrchr (filename, '.'); const gchar *pathext = NULL, *p; int extlen; if (lastdot == NULL) return FALSE; if (_stricmp (lastdot, ".exe") == 0 || _stricmp (lastdot, ".cmd") == 0 || _stricmp (lastdot, ".bat") == 0 || _stricmp (lastdot, ".com") == 0) return TRUE; /* Check if it is one of the types listed in %PATHEXT% */ pathext = g_getenv ("PATHEXT"); if (pathext == NULL) return FALSE; pathext = g_utf8_casefold (pathext, -1); lastdot = g_utf8_casefold (lastdot, -1); extlen = strlen (lastdot); p = pathext; while (TRUE) { const gchar *q = strchr (p, ';'); if (q == NULL) q = p + strlen (p); if (extlen == q - p && memcmp (lastdot, p, extlen) == 0) { g_free ((gchar *) pathext); g_free ((gchar *) lastdot); return TRUE; } if (*q) p = q + 1; else break; } g_free ((gchar *) pathext); g_free ((gchar *) lastdot); return FALSE; } return FALSE; #else if ((test & G_FILE_TEST_EXISTS) && (access (filename, F_OK) == 0)) return TRUE; if ((test & G_FILE_TEST_IS_EXECUTABLE) && (access (filename, X_OK) == 0)) { if (getuid () != 0) return TRUE; /* For root, on some POSIX systems, access (filename, X_OK) * will succeed even if no executable bits are set on the * file. We fall through to a stat test to avoid that. */ } else test &= ~G_FILE_TEST_IS_EXECUTABLE; if (test & G_FILE_TEST_IS_SYMLINK) { struct stat s; if ((lstat (filename, &s) == 0) && S_ISLNK (s.st_mode)) return TRUE; } if (test & (G_FILE_TEST_IS_REGULAR | G_FILE_TEST_IS_DIR | G_FILE_TEST_IS_EXECUTABLE)) { struct stat s; if (stat (filename, &s) == 0) { if ((test & G_FILE_TEST_IS_REGULAR) && S_ISREG (s.st_mode)) return TRUE; if ((test & G_FILE_TEST_IS_DIR) && S_ISDIR (s.st_mode)) return TRUE; /* The extra test for root when access (file, X_OK) succeeds. */ if ((test & G_FILE_TEST_IS_EXECUTABLE) && ((s.st_mode & S_IXOTH) || (s.st_mode & S_IXUSR) || (s.st_mode & S_IXGRP))) return TRUE; } } return FALSE; #endif } GQuark g_file_error_quark (void) { return g_quark_from_static_string ("g-file-error-quark"); } /** * g_file_error_from_errno: * @err_no: an "errno" value * * Gets a #GFileError constant based on the passed-in @errno. * For example, if you pass in %EEXIST this function returns * #G_FILE_ERROR_EXIST. Unlike @errno values, you can portably * assume that all #GFileError values will exist. * * Normally a #GFileError value goes into a #GError returned * from a function that manipulates files. So you would use * g_file_error_from_errno() when constructing a #GError. * * Return value: #GFileError corresponding to the given @errno **/ GFileError g_file_error_from_errno (gint err_no) { switch (err_no) { #ifdef EEXIST case EEXIST: return G_FILE_ERROR_EXIST; break; #endif #ifdef EISDIR case EISDIR: return G_FILE_ERROR_ISDIR; break; #endif #ifdef EACCES case EACCES: return G_FILE_ERROR_ACCES; break; #endif #ifdef ENAMETOOLONG case ENAMETOOLONG: return G_FILE_ERROR_NAMETOOLONG; break; #endif #ifdef ENOENT case ENOENT: return G_FILE_ERROR_NOENT; break; #endif #ifdef ENOTDIR case ENOTDIR: return G_FILE_ERROR_NOTDIR; break; #endif #ifdef ENXIO case ENXIO: return G_FILE_ERROR_NXIO; break; #endif #ifdef ENODEV case ENODEV: return G_FILE_ERROR_NODEV; break; #endif #ifdef EROFS case EROFS: return G_FILE_ERROR_ROFS; break; #endif #ifdef ETXTBSY case ETXTBSY: return G_FILE_ERROR_TXTBSY; break; #endif #ifdef EFAULT case EFAULT: return G_FILE_ERROR_FAULT; break; #endif #ifdef ELOOP case ELOOP: return G_FILE_ERROR_LOOP; break; #endif #ifdef ENOSPC case ENOSPC: return G_FILE_ERROR_NOSPC; break; #endif #ifdef ENOMEM case ENOMEM: return G_FILE_ERROR_NOMEM; break; #endif #ifdef EMFILE case EMFILE: return G_FILE_ERROR_MFILE; break; #endif #ifdef ENFILE case ENFILE: return G_FILE_ERROR_NFILE; break; #endif #ifdef EBADF case EBADF: return G_FILE_ERROR_BADF; break; #endif #ifdef EINVAL case EINVAL: return G_FILE_ERROR_INVAL; break; #endif #ifdef EPIPE case EPIPE: return G_FILE_ERROR_PIPE; break; #endif #ifdef EAGAIN case EAGAIN: return G_FILE_ERROR_AGAIN; break; #endif #ifdef EINTR case EINTR: return G_FILE_ERROR_INTR; break; #endif #ifdef EIO case EIO: return G_FILE_ERROR_IO; break; #endif #ifdef EPERM case EPERM: return G_FILE_ERROR_PERM; break; #endif #ifdef ENOSYS case ENOSYS: return G_FILE_ERROR_NOSYS; break; #endif default: return G_FILE_ERROR_FAILED; break; } } static gboolean get_contents_stdio (const gchar *display_filename, FILE *f, gchar **contents, gsize *length, GError **error) { gchar buf[4096]; gsize bytes; gchar *str = NULL; gsize total_bytes = 0; gsize total_allocated = 0; gchar *tmp; g_assert (f != NULL); while (!feof (f)) { gint save_errno; bytes = fread (buf, 1, sizeof (buf), f); save_errno = errno; while ((total_bytes + bytes + 1) > total_allocated) { if (str) total_allocated *= 2; else total_allocated = MIN (bytes + 1, sizeof (buf)); tmp = g_try_realloc (str, total_allocated); if (tmp == NULL) { g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_NOMEM, _("Could not allocate %lu bytes to read file \"%s\""), (gulong) total_allocated, display_filename); goto error; } str = tmp; } if (ferror (f)) { g_set_error (error, G_FILE_ERROR, g_file_error_from_errno (save_errno), _("Error reading file '%s': %s"), display_filename, g_strerror (save_errno)); goto error; } memcpy (str + total_bytes, buf, bytes); if (total_bytes + bytes < total_bytes) { g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED, _("File \"%s\" is too large"), display_filename); goto error; } total_bytes += bytes; } fclose (f); if (total_allocated == 0) { str = g_new (gchar, 1); total_bytes = 0; } str[total_bytes] = '\0'; if (length) *length = total_bytes; *contents = str; return TRUE; error: g_free (str); fclose (f); return FALSE; } #ifndef G_OS_WIN32 static gboolean get_contents_regfile (const gchar *display_filename, struct stat *stat_buf, gint fd, gchar **contents, gsize *length, GError **error) { gchar *buf; gsize bytes_read; gsize size; gsize alloc_size; size = stat_buf->st_size; alloc_size = size + 1; buf = g_try_malloc (alloc_size); if (buf == NULL) { g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_NOMEM, _("Could not allocate %lu bytes to read file \"%s\""), (gulong) alloc_size, display_filename); goto error; } bytes_read = 0; while (bytes_read < size) { gssize rc; rc = read (fd, buf + bytes_read, size - bytes_read); if (rc < 0) { if (errno != EINTR) { int save_errno = errno; g_free (buf); g_set_error (error, G_FILE_ERROR, g_file_error_from_errno (save_errno), _("Failed to read from file '%s': %s"), display_filename, g_strerror (save_errno)); goto error; } } else if (rc == 0) break; else bytes_read += rc; } buf[bytes_read] = '\0'; if (length) *length = bytes_read; *contents = buf; close (fd); return TRUE; error: close (fd); return FALSE; } static gboolean get_contents_posix (const gchar *filename, gchar **contents, gsize *length, GError **error) { struct stat stat_buf; gint fd; gchar *display_filename = g_filename_display_name (filename); /* O_BINARY useful on Cygwin */ fd = open (filename, O_RDONLY|O_BINARY); if (fd < 0) { int save_errno = errno; g_set_error (error, G_FILE_ERROR, g_file_error_from_errno (save_errno), _("Failed to open file '%s': %s"), display_filename, g_strerror (save_errno)); g_free (display_filename); return FALSE; } /* I don't think this will ever fail, aside from ENOMEM, but. */ if (fstat (fd, &stat_buf) < 0) { int save_errno = errno; close (fd); g_set_error (error, G_FILE_ERROR, g_file_error_from_errno (save_errno), _("Failed to get attributes of file '%s': fstat() failed: %s"), display_filename, g_strerror (save_errno)); g_free (display_filename); return FALSE; } if (stat_buf.st_size > 0 && S_ISREG (stat_buf.st_mode)) { gboolean retval = get_contents_regfile (display_filename, &stat_buf, fd, contents, length, error); g_free (display_filename); return retval; } else { FILE *f; gboolean retval; f = fdopen (fd, "r"); if (f == NULL) { int save_errno = errno; g_set_error (error, G_FILE_ERROR, g_file_error_from_errno (save_errno), _("Failed to open file '%s': fdopen() failed: %s"), display_filename, g_strerror (save_errno)); g_free (display_filename); return FALSE; } retval = get_contents_stdio (display_filename, f, contents, length, error); g_free (display_filename); return retval; } } #else /* G_OS_WIN32 */ static gboolean get_contents_win32 (const gchar *filename, gchar **contents, gsize *length, GError **error) { FILE *f; gboolean retval; gchar *display_filename = g_filename_display_name (filename); int save_errno; f = g_fopen (filename, "rb"); save_errno = errno; if (f == NULL) { g_set_error (error, G_FILE_ERROR, g_file_error_from_errno (save_errno), _("Failed to open file '%s': %s"), display_filename, g_strerror (save_errno)); g_free (display_filename); return FALSE; } retval = get_contents_stdio (display_filename, f, contents, length, error); g_free (display_filename); return retval; } #endif /** * g_file_get_contents: * @filename: name of a file to read contents from, in the GLib file name encoding * @contents: location to store an allocated string, use g_free() to free * the returned string * @length: location to store length in bytes of the contents, or %NULL * @error: return location for a #GError, or %NULL * * Reads an entire file into allocated memory, with good error * checking. * * If the call was successful, it returns %TRUE and sets @contents to the file * contents and @length to the length of the file contents in bytes. The string * stored in @contents will be nul-terminated, so for text files you can pass * %NULL for the @length argument. If the call was not successful, it returns * %FALSE and sets @error. The error domain is #G_FILE_ERROR. Possible error * codes are those in the #GFileError enumeration. In the error case, * @contents is set to %NULL and @length is set to zero. * * Return value: %TRUE on success, %FALSE if an error occurred **/ gboolean g_file_get_contents (const gchar *filename, gchar **contents, gsize *length, GError **error) { g_return_val_if_fail (filename != NULL, FALSE); g_return_val_if_fail (contents != NULL, FALSE); *contents = NULL; if (length) *length = 0; #ifdef G_OS_WIN32 return get_contents_win32 (filename, contents, length, error); #else return get_contents_posix (filename, contents, length, error); #endif } static gboolean rename_file (const char *old_name, const char *new_name, GError **err) { errno = 0; if (g_rename (old_name, new_name) == -1) { int save_errno = errno; gchar *display_old_name = g_filename_display_name (old_name); gchar *display_new_name = g_filename_display_name (new_name); g_set_error (err, G_FILE_ERROR, g_file_error_from_errno (save_errno), _("Failed to rename file '%s' to '%s': g_rename() failed: %s"), display_old_name, display_new_name, g_strerror (save_errno)); g_free (display_old_name); g_free (display_new_name); return FALSE; } return TRUE; } static gchar * write_to_temp_file (const gchar *contents, gssize length, const gchar *dest_file, GError **err) { gchar *tmp_name; gchar *display_name; gchar *retval; FILE *file; gint fd; int save_errno; retval = NULL; tmp_name = g_strdup_printf ("%s.XXXXXX", dest_file); errno = 0; fd = create_temp_file (tmp_name, 0666); save_errno = errno; display_name = g_filename_display_name (tmp_name); if (fd == -1) { g_set_error (err, G_FILE_ERROR, g_file_error_from_errno (save_errno), _("Failed to create file '%s': %s"), display_name, g_strerror (save_errno)); goto out; } errno = 0; file = fdopen (fd, "wb"); if (!file) { save_errno = errno; g_set_error (err, G_FILE_ERROR, g_file_error_from_errno (save_errno), _("Failed to open file '%s' for writing: fdopen() failed: %s"), display_name, g_strerror (save_errno)); close (fd); g_unlink (tmp_name); goto out; } if (length > 0) { gsize n_written; errno = 0; n_written = fwrite (contents, 1, length, file); if (n_written < length) { save_errno = errno; g_set_error (err, G_FILE_ERROR, g_file_error_from_errno (save_errno), _("Failed to write file '%s': fwrite() failed: %s"), display_name, g_strerror (save_errno)); fclose (file); g_unlink (tmp_name); goto out; } } errno = 0; if (fflush (file) != 0) { save_errno = errno; g_set_error (err, G_FILE_ERROR, g_file_error_from_errno (save_errno), _("Failed to write file '%s': fflush() failed: %s"), display_name, g_strerror (save_errno)); g_unlink (tmp_name); goto out; } #ifdef HAVE_FSYNC errno = 0; /* If the final destination exists, we want to sync the newly written * file to ensure the data is on disk when we rename over the destination. * otherwise if we get a system crash we can lose both the new and the * old file on some filesystems. (I.E. those that don't guarantee the * data is written to the disk before the metadata.) */ if (g_file_test (dest_file, G_FILE_TEST_EXISTS) && fsync (fileno (file)) != 0) { save_errno = errno; g_set_error (err, G_FILE_ERROR, g_file_error_from_errno (save_errno), _("Failed to write file '%s': fsync() failed: %s"), display_name, g_strerror (save_errno)); g_unlink (tmp_name); goto out; } #endif errno = 0; if (fclose (file) == EOF) { save_errno = errno; g_set_error (err, G_FILE_ERROR, g_file_error_from_errno (save_errno), _("Failed to close file '%s': fclose() failed: %s"), display_name, g_strerror (save_errno)); g_unlink (tmp_name); goto out; } retval = g_strdup (tmp_name); out: g_free (tmp_name); g_free (display_name); return retval; } /** * g_file_set_contents: * @filename: name of a file to write @contents to, in the GLib file name * encoding * @contents: string to write to the file * @length: length of @contents, or -1 if @contents is a nul-terminated string * @error: return location for a #GError, or %NULL * * Writes all of @contents to a file named @filename, with good error checking. * If a file called @filename already exists it will be overwritten. * * This write is atomic in the sense that it is first written to a temporary * file which is then renamed to the final name. Notes: * * * On Unix, if @filename already exists hard links to @filename will break. * Also since the file is recreated, existing permissions, access control * lists, metadata etc. may be lost. If @filename is a symbolic link, * the link itself will be replaced, not the linked file. * * * On Windows renaming a file will not remove an existing file with the * new name, so on Windows there is a race condition between the existing * file being removed and the temporary file being renamed. * * * On Windows there is no way to remove a file that is open to some * process, or mapped into memory. Thus, this function will fail if * @filename already exists and is open. * * * * If the call was sucessful, it returns %TRUE. If the call was not successful, * it returns %FALSE and sets @error. The error domain is #G_FILE_ERROR. * Possible error codes are those in the #GFileError enumeration. * * Return value: %TRUE on success, %FALSE if an error occurred * * Since: 2.8 **/ gboolean g_file_set_contents (const gchar *filename, const gchar *contents, gssize length, GError **error) { gchar *tmp_filename; gboolean retval; GError *rename_error = NULL; g_return_val_if_fail (filename != NULL, FALSE); g_return_val_if_fail (error == NULL || *error == NULL, FALSE); g_return_val_if_fail (contents != NULL || length == 0, FALSE); g_return_val_if_fail (length >= -1, FALSE); if (length == -1) length = strlen (contents); tmp_filename = write_to_temp_file (contents, length, filename, error); if (!tmp_filename) { retval = FALSE; goto out; } if (!rename_file (tmp_filename, filename, &rename_error)) { #ifndef G_OS_WIN32 g_unlink (tmp_filename); g_propagate_error (error, rename_error); retval = FALSE; goto out; #else /* G_OS_WIN32 */ /* Renaming failed, but on Windows this may just mean * the file already exists. So if the target file * exists, try deleting it and do the rename again. */ if (!g_file_test (filename, G_FILE_TEST_EXISTS)) { g_unlink (tmp_filename); g_propagate_error (error, rename_error); retval = FALSE; goto out; } g_error_free (rename_error); if (g_unlink (filename) == -1) { gchar *display_filename = g_filename_display_name (filename); int save_errno = errno; g_set_error (error, G_FILE_ERROR, g_file_error_from_errno (save_errno), _("Existing file '%s' could not be removed: g_unlink() failed: %s"), display_filename, g_strerror (save_errno)); g_free (display_filename); g_unlink (tmp_filename); retval = FALSE; goto out; } if (!rename_file (tmp_filename, filename, error)) { g_unlink (tmp_filename); retval = FALSE; goto out; } #endif } retval = TRUE; out: g_free (tmp_filename); return retval; } /* * create_temp_file based on the mkstemp implementation from the GNU C library. * Copyright (C) 1991,92,93,94,95,96,97,98,99 Free Software Foundation, Inc. */ static gint create_temp_file (gchar *tmpl, int permissions) { char *XXXXXX; int count, fd; static const char letters[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"; static const int NLETTERS = sizeof (letters) - 1; glong value; GTimeVal tv; static int counter = 0; /* find the last occurrence of "XXXXXX" */ XXXXXX = g_strrstr (tmpl, "XXXXXX"); if (!XXXXXX || strncmp (XXXXXX, "XXXXXX", 6)) { errno = EINVAL; return -1; } /* Get some more or less random data. */ g_get_current_time (&tv); value = (tv.tv_usec ^ tv.tv_sec) + counter++; for (count = 0; count < 100; value += 7777, ++count) { glong v = value; /* Fill in the random bits. */ XXXXXX[0] = letters[v % NLETTERS]; v /= NLETTERS; XXXXXX[1] = letters[v % NLETTERS]; v /= NLETTERS; XXXXXX[2] = letters[v % NLETTERS]; v /= NLETTERS; XXXXXX[3] = letters[v % NLETTERS]; v /= NLETTERS; XXXXXX[4] = letters[v % NLETTERS]; v /= NLETTERS; XXXXXX[5] = letters[v % NLETTERS]; /* tmpl is in UTF-8 on Windows, thus use g_open() */ fd = g_open (tmpl, O_RDWR | O_CREAT | O_EXCL | O_BINARY, permissions); if (fd >= 0) return fd; else if (errno != EEXIST) /* Any other error will apply also to other names we might * try, and there are 2^32 or so of them, so give up now. */ return -1; } /* We got out of the loop because we ran out of combinations to try. */ errno = EEXIST; return -1; } /** * g_mkstemp: * @tmpl: template filename * * Opens a temporary file. See the mkstemp() documentation * on most UNIX-like systems. * * The parameter is a string that should follow the rules for * mkstemp() templates, i.e. contain the string "XXXXXX". * g_mkstemp() is slightly more flexible than mkstemp() * in that the sequence does not have to occur at the very end of the * template. The X string will * be modified to form the name of a file that didn't exist. * The string should be in the GLib file name encoding. Most importantly, * on Windows it should be in UTF-8. * * Return value: A file handle (as from open()) to the file * opened for reading and writing. The file is opened in binary mode * on platforms where there is a difference. The file handle should be * closed with close(). In case of errors, -1 is returned. */ gint g_mkstemp (gchar *tmpl) { return create_temp_file (tmpl, 0600); } /** * g_file_open_tmp: * @tmpl: Template for file name, as in g_mkstemp(), basename only, * or %NULL, to a default template * @name_used: location to store actual name used, or %NULL * @error: return location for a #GError * * Opens a file for writing in the preferred directory for temporary * files (as returned by g_get_tmp_dir()). * * @tmpl should be a string in the GLib file name encoding containing * a sequence of six 'X' characters, as the parameter to g_mkstemp(). * However, unlike these functions, the template should only be a * basename, no directory components are allowed. If template is * %NULL, a default template is used. * * Note that in contrast to g_mkstemp() (and mkstemp()) * @tmpl is not modified, and might thus be a read-only literal string. * * The actual name used is returned in @name_used if non-%NULL. This * string should be freed with g_free() when not needed any longer. * The returned name is in the GLib file name encoding. * * Return value: A file handle (as from open()) to * the file opened for reading and writing. The file is opened in binary * mode on platforms where there is a difference. The file handle should be * closed with close(). In case of errors, -1 is returned * and @error will be set. **/ gint g_file_open_tmp (const gchar *tmpl, gchar **name_used, GError **error) { int retval; const char *tmpdir; const char *sep; char *fulltemplate; const char *slash; if (tmpl == NULL) tmpl = ".XXXXXX"; if ((slash = strchr (tmpl, G_DIR_SEPARATOR)) != NULL #ifdef G_OS_WIN32 || (strchr (tmpl, '/') != NULL && (slash = "/")) #endif ) { gchar *display_tmpl = g_filename_display_name (tmpl); char c[2]; c[0] = *slash; c[1] = '\0'; g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED, _("Template '%s' invalid, should not contain a '%s'"), display_tmpl, c); g_free (display_tmpl); return -1; } if (strstr (tmpl, "XXXXXX") == NULL) { gchar *display_tmpl = g_filename_display_name (tmpl); g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED, _("Template '%s' doesn't contain XXXXXX"), display_tmpl); g_free (display_tmpl); return -1; } tmpdir = g_get_tmp_dir (); if (G_IS_DIR_SEPARATOR (tmpdir [strlen (tmpdir) - 1])) sep = ""; else sep = G_DIR_SEPARATOR_S; fulltemplate = g_strconcat (tmpdir, sep, tmpl, NULL); retval = g_mkstemp (fulltemplate); if (retval == -1) { int save_errno = errno; gchar *display_fulltemplate = g_filename_display_name (fulltemplate); g_set_error (error, G_FILE_ERROR, g_file_error_from_errno (save_errno), _("Failed to create file '%s': %s"), display_fulltemplate, g_strerror (save_errno)); g_free (display_fulltemplate); g_free (fulltemplate); return -1; } if (name_used) *name_used = fulltemplate; else g_free (fulltemplate); return retval; } static gchar * g_build_path_va (const gchar *separator, const gchar *first_element, va_list *args, gchar **str_array) { GString *result; gint separator_len = strlen (separator); gboolean is_first = TRUE; gboolean have_leading = FALSE; const gchar *single_element = NULL; const gchar *next_element; const gchar *last_trailing = NULL; gint i = 0; result = g_string_new (NULL); if (str_array) next_element = str_array[i++]; else next_element = first_element; while (TRUE) { const gchar *element; const gchar *start; const gchar *end; if (next_element) { element = next_element; if (str_array) next_element = str_array[i++]; else next_element = va_arg (*args, gchar *); } else break; /* Ignore empty elements */ if (!*element) continue; start = element; if (separator_len) { while (start && strncmp (start, separator, separator_len) == 0) start += separator_len; } end = start + strlen (start); if (separator_len) { while (end >= start + separator_len && strncmp (end - separator_len, separator, separator_len) == 0) end -= separator_len; last_trailing = end; while (last_trailing >= element + separator_len && strncmp (last_trailing - separator_len, separator, separator_len) == 0) last_trailing -= separator_len; if (!have_leading) { /* If the leading and trailing separator strings are in the * same element and overlap, the result is exactly that element */ if (last_trailing <= start) single_element = element; g_string_append_len (result, element, start - element); have_leading = TRUE; } else single_element = NULL; } if (end == start) continue; if (!is_first) g_string_append (result, separator); g_string_append_len (result, start, end - start); is_first = FALSE; } if (single_element) { g_string_free (result, TRUE); return g_strdup (single_element); } else { if (last_trailing) g_string_append (result, last_trailing); return g_string_free (result, FALSE); } } /** * g_build_pathv: * @separator: a string used to separator the elements of the path. * @args: %NULL-terminated array of strings containing the path elements. * * Behaves exactly like g_build_path(), but takes the path elements * as a string array, instead of varargs. This function is mainly * meant for language bindings. * * Return value: a newly-allocated string that must be freed with g_free(). * * Since: 2.8 */ gchar * g_build_pathv (const gchar *separator, gchar **args) { if (!args) return NULL; return g_build_path_va (separator, NULL, NULL, args); } /** * g_build_path: * @separator: a string used to separator the elements of the path. * @first_element: the first element in the path * @Varargs: remaining elements in path, terminated by %NULL * * Creates a path from a series of elements using @separator as the * separator between elements. At the boundary between two elements, * any trailing occurrences of separator in the first element, or * leading occurrences of separator in the second element are removed * and exactly one copy of the separator is inserted. * * Empty elements are ignored. * * The number of leading copies of the separator on the result is * the same as the number of leading copies of the separator on * the first non-empty element. * * The number of trailing copies of the separator on the result is * the same as the number of trailing copies of the separator on * the last non-empty element. (Determination of the number of * trailing copies is done without stripping leading copies, so * if the separator is ABA, ABABA * has 1 trailing copy.) * * However, if there is only a single non-empty element, and there * are no characters in that element not part of the leading or * trailing separators, then the result is exactly the original value * of that element. * * Other than for determination of the number of leading and trailing * copies of the separator, elements consisting only of copies * of the separator are ignored. * * Return value: a newly-allocated string that must be freed with g_free(). **/ gchar * g_build_path (const gchar *separator, const gchar *first_element, ...) { gchar *str; va_list args; g_return_val_if_fail (separator != NULL, NULL); va_start (args, first_element); str = g_build_path_va (separator, first_element, &args, NULL); va_end (args); return str; } #ifdef G_OS_WIN32 static gchar * g_build_pathname_va (const gchar *first_element, va_list *args, gchar **str_array) { /* Code copied from g_build_pathv(), and modified to use two * alternative single-character separators. */ GString *result; gboolean is_first = TRUE; gboolean have_leading = FALSE; const gchar *single_element = NULL; const gchar *next_element; const gchar *last_trailing = NULL; gchar current_separator = '\\'; gint i = 0; result = g_string_new (NULL); if (str_array) next_element = str_array[i++]; else next_element = first_element; while (TRUE) { const gchar *element; const gchar *start; const gchar *end; if (next_element) { element = next_element; if (str_array) next_element = str_array[i++]; else next_element = va_arg (*args, gchar *); } else break; /* Ignore empty elements */ if (!*element) continue; start = element; if (TRUE) { while (start && (*start == '\\' || *start == '/')) { current_separator = *start; start++; } } end = start + strlen (start); if (TRUE) { while (end >= start + 1 && (end[-1] == '\\' || end[-1] == '/')) { current_separator = end[-1]; end--; } last_trailing = end; while (last_trailing >= element + 1 && (last_trailing[-1] == '\\' || last_trailing[-1] == '/')) last_trailing--; if (!have_leading) { /* If the leading and trailing separator strings are in the * same element and overlap, the result is exactly that element */ if (last_trailing <= start) single_element = element; g_string_append_len (result, element, start - element); have_leading = TRUE; } else single_element = NULL; } if (end == start) continue; if (!is_first) g_string_append_len (result, ¤t_separator, 1); g_string_append_len (result, start, end - start); is_first = FALSE; } if (single_element) { g_string_free (result, TRUE); return g_strdup (single_element); } else { if (last_trailing) g_string_append (result, last_trailing); return g_string_free (result, FALSE); } } #endif /** * g_build_filenamev: * @args: %NULL-terminated array of strings containing the path elements. * * Behaves exactly like g_build_filename(), but takes the path elements * as a string array, instead of varargs. This function is mainly * meant for language bindings. * * Return value: a newly-allocated string that must be freed with g_free(). * * Since: 2.8 */ gchar * g_build_filenamev (gchar **args) { gchar *str; #ifndef G_OS_WIN32 str = g_build_path_va (G_DIR_SEPARATOR_S, NULL, NULL, args); #else str = g_build_pathname_va (NULL, NULL, args); #endif return str; } /** * g_build_filename: * @first_element: the first element in the path * @Varargs: remaining elements in path, terminated by %NULL * * Creates a filename from a series of elements using the correct * separator for filenames. * * On Unix, this function behaves identically to g_build_path * (G_DIR_SEPARATOR_S, first_element, ....). * * On Windows, it takes into account that either the backslash * (\ or slash (/) can be used * as separator in filenames, but otherwise behaves as on Unix. When * file pathname separators need to be inserted, the one that last * previously occurred in the parameters (reading from left to right) * is used. * * No attempt is made to force the resulting filename to be an absolute * path. If the first element is a relative path, the result will * be a relative path. * * Return value: a newly-allocated string that must be freed with g_free(). **/ gchar * g_build_filename (const gchar *first_element, ...) { gchar *str; va_list args; va_start (args, first_element); #ifndef G_OS_WIN32 str = g_build_path_va (G_DIR_SEPARATOR_S, first_element, &args, NULL); #else str = g_build_pathname_va (first_element, &args, NULL); #endif va_end (args); return str; } #define KILOBYTE_FACTOR 1024.0 #define MEGABYTE_FACTOR (1024.0 * 1024.0) #define GIGABYTE_FACTOR (1024.0 * 1024.0 * 1024.0) /** * g_format_size_for_display: * @size: a size in bytes. * * Formats a size (for example the size of a file) into a human readable string. * Sizes are rounded to the nearest size prefix (KB, MB, GB) and are displayed * rounded to the nearest tenth. E.g. the file size 3292528 bytes will be * converted into the string "3.1 MB". * * The prefix units base is 1024 (i.e. 1 KB is 1024 bytes). * * This string should be freed with g_free() when not needed any longer. * * Returns: a newly-allocated formatted string containing a human readable * file size. * * Since: 2.16 **/ char * g_format_size_for_display (goffset size) { if (size < (goffset) KILOBYTE_FACTOR) return g_strdup_printf (g_dngettext(GETTEXT_PACKAGE, "%u byte", "%u bytes",(guint) size), (guint) size); else { gdouble displayed_size; if (size < (goffset) MEGABYTE_FACTOR) { displayed_size = (gdouble) size / KILOBYTE_FACTOR; return g_strdup_printf (_("%.1f KB"), displayed_size); } else if (size < (goffset) GIGABYTE_FACTOR) { displayed_size = (gdouble) size / MEGABYTE_FACTOR; return g_strdup_printf (_("%.1f MB"), displayed_size); } else { displayed_size = (gdouble) size / GIGABYTE_FACTOR; return g_strdup_printf (_("%.1f GB"), displayed_size); } } } /** * g_file_read_link: * @filename: the symbolic link * @error: return location for a #GError * * Reads the contents of the symbolic link @filename like the POSIX * readlink() function. The returned string is in the encoding used * for filenames. Use g_filename_to_utf8() to convert it to UTF-8. * * Returns: A newly-allocated string with the contents of the symbolic link, * or %NULL if an error occurred. * * Since: 2.4 */ gchar * g_file_read_link (const gchar *filename, GError **error) { #ifdef HAVE_READLINK gchar *buffer; guint size; gint read_size; size = 256; buffer = g_malloc (size); while (TRUE) { read_size = readlink (filename, buffer, size); if (read_size < 0) { int save_errno = errno; gchar *display_filename = g_filename_display_name (filename); g_free (buffer); g_set_error (error, G_FILE_ERROR, g_file_error_from_errno (save_errno), _("Failed to read the symbolic link '%s': %s"), display_filename, g_strerror (save_errno)); g_free (display_filename); return NULL; } if (read_size < size) { buffer[read_size] = 0; return buffer; } size *= 2; buffer = g_realloc (buffer, size); } #else g_set_error_literal (error, G_FILE_ERROR, G_FILE_ERROR_INVAL, _("Symbolic links not supported")); return NULL; #endif } /* NOTE : Keep this part last to ensure nothing in this file uses the * below binary compatibility versions. */ #if defined (G_OS_WIN32) && !defined (_WIN64) /* Binary compatibility versions. Will be called by code compiled * against quite old (pre-2.8, I think) headers only, not from more * recently compiled code. */ #undef g_file_test gboolean g_file_test (const gchar *filename, GFileTest test) { gchar *utf8_filename = g_locale_to_utf8 (filename, -1, NULL, NULL, NULL); gboolean retval; if (utf8_filename == NULL) return FALSE; retval = g_file_test_utf8 (utf8_filename, test); g_free (utf8_filename); return retval; } #undef g_file_get_contents gboolean g_file_get_contents (const gchar *filename, gchar **contents, gsize *length, GError **error) { gchar *utf8_filename = g_locale_to_utf8 (filename, -1, NULL, NULL, error); gboolean retval; if (utf8_filename == NULL) return FALSE; retval = g_file_get_contents_utf8 (utf8_filename, contents, length, error); g_free (utf8_filename); return retval; } #undef g_mkstemp gint g_mkstemp (gchar *tmpl) { char *XXXXXX; int count, fd; static const char letters[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"; static const int NLETTERS = sizeof (letters) - 1; glong value; GTimeVal tv; static int counter = 0; /* find the last occurrence of 'XXXXXX' */ XXXXXX = g_strrstr (tmpl, "XXXXXX"); if (!XXXXXX) { errno = EINVAL; return -1; } /* Get some more or less random data. */ g_get_current_time (&tv); value = (tv.tv_usec ^ tv.tv_sec) + counter++; for (count = 0; count < 100; value += 7777, ++count) { glong v = value; /* Fill in the random bits. */ XXXXXX[0] = letters[v % NLETTERS]; v /= NLETTERS; XXXXXX[1] = letters[v % NLETTERS]; v /= NLETTERS; XXXXXX[2] = letters[v % NLETTERS]; v /= NLETTERS; XXXXXX[3] = letters[v % NLETTERS]; v /= NLETTERS; XXXXXX[4] = letters[v % NLETTERS]; v /= NLETTERS; XXXXXX[5] = letters[v % NLETTERS]; /* This is the backward compatibility system codepage version, * thus use normal open(). */ fd = open (tmpl, O_RDWR | O_CREAT | O_EXCL | O_BINARY, 0600); if (fd >= 0) return fd; else if (errno != EEXIST) /* Any other error will apply also to other names we might * try, and there are 2^32 or so of them, so give up now. */ return -1; } /* We got out of the loop because we ran out of combinations to try. */ errno = EEXIST; return -1; } #undef g_file_open_tmp gint g_file_open_tmp (const gchar *tmpl, gchar **name_used, GError **error) { gchar *utf8_tmpl = g_locale_to_utf8 (tmpl, -1, NULL, NULL, error); gchar *utf8_name_used; gint retval; if (utf8_tmpl == NULL) return -1; retval = g_file_open_tmp_utf8 (utf8_tmpl, &utf8_name_used, error); if (retval == -1) return -1; if (name_used) *name_used = g_locale_from_utf8 (utf8_name_used, -1, NULL, NULL, NULL); g_free (utf8_name_used); return retval; } #endif #define __G_FILEUTILS_C__ #include "galiasdef.c"