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glib/gfileutils.c
Havoc Pennington 4eab875811 docs 
2001-04-16  Havoc Pennington  <hp@redhat.com>

        * gqsort.c: docs

        * gfileutils.c: docs

        * gwin32.c: docs fixes

        * gconvert.c: docs

        * guniprop.c: docs

        * gutf8.c: docs
2001-04-16 20:05:25 +00:00

699 lines
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/* 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 <sys/stat.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#ifdef G_OS_WIN32
#include <io.h>
#ifndef F_OK
#define F_OK 0
#define X_OK 1
#define W_OK 2
#define R_OK 4
#endif /* !F_OK */
#ifndef S_ISREG
#define S_ISREG(mode) ((mode)&_S_IFREG)
#endif
#ifndef S_ISDIR
#define S_ISDIR(mode) ((mode)&_S_IFDIR)
#endif
#endif /* G_OS_WIN32 */
#ifndef S_ISLNK
#define S_ISLNK(x) 0
#endif
#ifndef O_BINARY
#define O_BINARY 0
#endif
#include "glibintl.h"
/**
* g_file_test:
* @filename: a filename to test
* @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.
*
* Return value: whether a test was TRUE
**/
gboolean
g_file_test (const gchar *filename,
GFileTest test)
{
if (test & G_FILE_TEST_EXISTS)
return (access (filename, F_OK) == 0);
else if (test & G_FILE_TEST_IS_EXECUTABLE)
return (access (filename, X_OK) == 0);
else
{
struct stat s;
if (stat (filename, &s) < 0)
return FALSE;
if ((test & G_FILE_TEST_IS_REGULAR) &&
S_ISREG (s.st_mode))
return TRUE;
else if ((test & G_FILE_TEST_IS_DIR) &&
S_ISDIR (s.st_mode))
return TRUE;
else if ((test & G_FILE_TEST_IS_SYMLINK) &&
S_ISLNK (s.st_mode))
return TRUE;
else
return FALSE;
}
}
GQuark
g_file_error_quark (void)
{
static GQuark q = 0;
if (q == 0)
q = g_quark_from_static_string ("g-file-error-quark");
return q;
}
/**
* 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
default:
return G_FILE_ERROR_FAILED;
break;
}
}
static gboolean
get_contents_stdio (const gchar *filename,
FILE *f,
gchar **contents,
guint *length,
GError **error)
{
gchar buf[2048];
size_t bytes;
GString *str;
g_assert (f != NULL);
str = g_string_new ("");
while (!feof (f))
{
bytes = fread (buf, 1, 2048, f);
if (ferror (f))
{
g_set_error (error,
G_FILE_ERROR,
g_file_error_from_errno (errno),
_("Error reading file '%s': %s"),
filename, strerror (errno));
g_string_free (str, TRUE);
return FALSE;
}
g_string_append_len (str, buf, bytes);
}
fclose (f);
if (length)
*length = str->len;
*contents = g_string_free (str, FALSE);
return TRUE;
}
#ifndef G_OS_WIN32
static gboolean
get_contents_regfile (const gchar *filename,
struct stat *stat_buf,
gint fd,
gchar **contents,
guint *length,
GError **error)
{
gchar *buf;
size_t bytes_read;
size_t size;
size = stat_buf->st_size;
buf = g_new (gchar, size + 1);
bytes_read = 0;
while (bytes_read < size)
{
gint rc;
rc = read (fd, buf + bytes_read, size - bytes_read);
if (rc < 0)
{
if (errno != EINTR)
{
close (fd);
g_free (buf);
g_set_error (error,
G_FILE_ERROR,
g_file_error_from_errno (errno),
_("Failed to read from file '%s': %s"),
filename, strerror (errno));
return FALSE;
}
}
else if (rc == 0)
break;
else
bytes_read += rc;
}
buf[bytes_read] = '\0';
if (length)
*length = bytes_read;
*contents = buf;
return TRUE;
}
static gboolean
get_contents_posix (const gchar *filename,
gchar **contents,
guint *length,
GError **error)
{
struct stat stat_buf;
gint fd;
/* O_BINARY useful on Cygwin */
fd = open (filename, O_RDONLY|O_BINARY);
if (fd < 0)
{
g_set_error (error,
G_FILE_ERROR,
g_file_error_from_errno (errno),
_("Failed to open file '%s': %s"),
filename, strerror (errno));
return FALSE;
}
/* I don't think this will ever fail, aside from ENOMEM, but. */
if (fstat (fd, &stat_buf) < 0)
{
close (fd);
g_set_error (error,
G_FILE_ERROR,
g_file_error_from_errno (errno),
_("Failed to get attributes of file '%s': fstat() failed: %s"),
filename, strerror (errno));
return FALSE;
}
if (stat_buf.st_size > 0 && S_ISREG (stat_buf.st_mode))
{
return get_contents_regfile (filename,
&stat_buf,
fd,
contents,
length,
error);
}
else
{
FILE *f;
f = fdopen (fd, "r");
if (f == NULL)
{
g_set_error (error,
G_FILE_ERROR,
g_file_error_from_errno (errno),
_("Failed to open file '%s': fdopen() failed: %s"),
filename, strerror (errno));
return FALSE;
}
return get_contents_stdio (filename, f, contents, length, error);
}
}
#else /* G_OS_WIN32 */
static gboolean
get_contents_win32 (const gchar *filename,
gchar **contents,
guint *length,
GError **error)
{
FILE *f;
/* I guess you want binary mode; maybe you want text sometimes? */
f = fopen (filename, "rb");
if (f == NULL)
{
g_set_error (error,
G_FILE_ERROR,
g_file_error_from_errno (errno),
_("Failed to open file '%s': %s"),
filename, strerror (errno));
return FALSE;
}
return get_contents_stdio (filename, f, contents, length, error);
}
#endif
/**
* g_file_get_contents:
* @filename: a file to read contents from
* @contents: location to store an allocated string
* @length: location to store length in bytes of the contents
* @error: return location for a #GError
*
* Reads an entire file into allocated memory, with good error
* checking. If @error is set, FALSE is returned, and @contents is set
* to NULL. If TRUE is returned, @error will not be set, and @contents
* will be set to the file contents. The string stored in @contents
* will be nul-terminated, so for text files you can pass NULL for the
* @length argument. The error domain is #G_FILE_ERROR. Possible
* error codes are those in the #GFileError enumeration.
*
* FIXME currently crashes if the file is too big to fit in memory;
* should probably use g_try_malloc() when we have that function.
*
* Return value: TRUE on success, FALSE if error is set
**/
gboolean
g_file_get_contents (const gchar *filename,
gchar **contents,
guint *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
}
/*
* mkstemp() implementation is from the GNU C library.
* Copyright (C) 1991,92,93,94,95,96,97,98,99 Free Software Foundation, Inc.
*/
/**
* g_mkstemp:
* @tmpl: template filename
*
* Open a temporary file. See "man mkstemp" on most UNIX-like systems.
* This is a portability wrapper, which simply calls mkstemp() on systems
* that have it, and implements it in GLib otherwise.
*
* The parameter is a string that should match the rules for mktemp, i.e.
* end in "XXXXXX". The X string will be modified to form the name
* of a file that didn't exist.
*
* 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.
*/
int
g_mkstemp (char *tmpl)
{
#ifdef HAVE_MKSTEMP
return mkstemp (tmpl);
#else
int len;
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;
len = strlen (tmpl);
if (len < 6 || strcmp (&tmpl[len - 6], "XXXXXX"))
return -1;
/* This is where the Xs start. */
XXXXXX = &tmpl[len - 6];
/* 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];
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. */
return -1;
#endif
}
/**
* g_file_open_tmp:
* @tmpl: Template for file name, as in g_mkstemp, basename only
* @name_used: location to store actual name used
* @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 ending with six 'X' characters, as the
* parameter to g_mkstemp() (or 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.
*
* 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.
**/
int
g_file_open_tmp (const char *tmpl,
char **name_used,
GError **error)
{
int retval;
const char *tmpdir;
char *sep;
char *fulltemplate;
if (tmpl == NULL)
tmpl = ".XXXXXX";
if (strchr (tmpl, G_DIR_SEPARATOR)
#ifdef G_OS_WIN32
|| strchr (tmpl, '/')
#endif
)
{
g_set_error (error,
G_FILE_ERROR,
G_FILE_ERROR_FAILED,
_("Template '%s' illegal, should not contain a '%s'"),
tmpl, G_DIR_SEPARATOR_S);
return -1;
}
if (strlen (tmpl) < 6 ||
strcmp (tmpl + strlen (tmpl) - 6, "XXXXXX") != 0)
{
g_set_error (error,
G_FILE_ERROR,
G_FILE_ERROR_FAILED,
_("Template '%s' doesn't end with XXXXXX"),
tmpl);
return -1;
}
tmpdir = g_get_tmp_dir ();
if (tmpdir [strlen (tmpdir) - 1] == G_DIR_SEPARATOR)
sep = "";
else
sep = G_DIR_SEPARATOR_S;
fulltemplate = g_strconcat (tmpdir, sep, tmpl, NULL);
retval = g_mkstemp (fulltemplate);
if (retval == -1)
{
g_set_error (error,
G_FILE_ERROR,
g_file_error_from_errno (errno),
_("Failed to create file '%s': %s"),
fulltemplate, strerror (errno));
g_free (fulltemplate);
return -1;
}
if (name_used)
*name_used = fulltemplate;
else
g_free (fulltemplate);
return retval;
}
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