#include <ctype.h>
#include <errno.h>
+#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
+#include <unistd.h>
#include "intprops.h"
#include "minmax.h"
#include "dirname.h"
+#include "xmalloca.h"
-#include <libpspp/alloc.h>
-#include <libpspp/message.h>
#include <data/settings.h>
+#include <libpspp/hash.h>
+#include <libpspp/message.h>
#include <libpspp/str.h>
#include <libpspp/verbose-msg.h>
#include <libpspp/version.h>
+#include "xalloc.h"
+
#include "gettext.h"
#define _(msgid) gettext (msgid)
FILE *
fn_open (const char *fn, const char *mode)
{
- assert (mode[0] == 'r' || mode[0] == 'w');
+ assert (mode[0] == 'r' || mode[0] == 'w' || mode[0] == 'a');
if (mode[0] == 'r' && (!strcmp (fn, "stdin") || !strcmp (fn, "-")))
return stdin;
if (get_safer_mode ())
return safety_violation (fn);
- return popen (&fn[1], mode);
+ return popen (&fn[1], mode[0] == 'r' ? "r" : "w");
}
else if (*fn && fn[strlen (fn) - 1] == '|')
{
if (get_safer_mode ())
return safety_violation (fn);
- s = local_alloc (strlen (fn));
+ s = xmalloca (strlen (fn));
memcpy (s, fn, strlen (fn) - 1);
s[strlen (fn) - 1] = 0;
- f = popen (s, mode);
+ f = popen (s, mode[0] == 'r' ? "r" : "w");
- local_free (s);
+ freea (s);
return f;
}
return fclose (f);
}
-#if !(defined _WIN32 || defined __WIN32__)
-/* A file's identity. */
-struct file_identity
+/* Creates a new file named FN with the given PERMISSIONS bits,
+ and returns a stream for it or a null pointer on failure.
+ MODE should be "w" or "wb". */
+FILE *
+create_stream (const char *fn, const char *mode, mode_t permissions)
{
- dev_t device; /* Device number. */
- ino_t inode; /* Inode number. */
-};
+ int fd;
+ FILE *stream;
-/* Returns a pointer to a dynamically allocated structure whose
- value can be used to tell whether two files are actually the
- same file. Returns a null pointer if no information about the
- file is available, perhaps because it does not exist. The
- caller is responsible for freeing the structure with
- fn_free_identity() when finished. */
-struct file_identity *
-fn_get_identity (const char *file_name)
-{
- struct stat s;
+ fd = open (fn, O_WRONLY | O_CREAT | O_TRUNC, permissions);
+ if (fd < 0)
+ return NULL;
- if (stat (file_name, &s) == 0)
+ stream = fdopen (fd, mode);
+ if (stream == NULL)
{
- struct file_identity *identity = xmalloc (sizeof *identity);
- identity->device = s.st_dev;
- identity->inode = s.st_ino;
- return identity;
+ int save_errno = errno;
+ close (fd);
+ errno = save_errno;
}
- else
- return NULL;
-}
-/* Frees IDENTITY obtained from fn_get_identity(). */
-void
-fn_free_identity (struct file_identity *identity)
-{
- free (identity);
+ return stream;
}
-/* Compares A and B, returning a strcmp()-type result. */
-int
-fn_compare_file_identities (const struct file_identity *a,
- const struct file_identity *b)
-{
- assert (a != NULL);
- assert (b != NULL);
- if (a->device != b->device)
- return a->device < b->device ? -1 : 1;
- else
- return a->inode < b->inode ? -1 : a->inode > b->inode;
-}
-#else /* Windows */
-/* A file's identity. */
+/* A file's identity:
+
+ - For a file that exists, this is its device and inode.
+
+ - For a file that does not exist, but which has a directory
+ name that exists, this is the device and inode of the
+ directory, plus the file's base name.
+
+ - For a file that does not exist and has a nonexistent
+ directory, this is the file name.
+
+ Windows doesn't have inode numbers, so we just use the name
+ there. */
struct file_identity
{
- char *normalized_file_name; /* File's normalized name. */
+ dev_t device; /* Device number. */
+ ino_t inode; /* Inode number. */
+ char *name; /* File name, where needed, otherwise NULL. */
};
/* Returns a pointer to a dynamically allocated structure whose
fn_get_identity (const char *file_name)
{
struct file_identity *identity = xmalloc (sizeof *identity);
- char cname[PATH_MAX];
- if (GetFullPathName (file_name, sizeof cname, cname, NULL))
- identity->normalized_file_name = xstrdup (cname);
+#if !(defined _WIN32 || defined __WIN32__)
+ struct stat s;
+ if (lstat (file_name, &s) == 0)
+ {
+ identity->device = s.st_dev;
+ identity->inode = s.st_ino;
+ identity->name = NULL;
+ }
else
- identity->normalized_file_name = xstrdup (file_name);
+ {
+ char *dir = dir_name (file_name);
+ if (last_component (file_name) != NULL && stat (dir, &s) == 0)
+ {
+ identity->device = s.st_dev;
+ identity->inode = s.st_ino;
+ identity->name = base_name (file_name);
+ }
+ else
+ {
+ identity->device = 0;
+ identity->inode = 0;
+ identity->name = xstrdup (file_name);
+ }
+ free (dir);
+ }
+#else /* Windows */
+ char cname[PATH_MAX];
+ int ok = GetFullPathName (file_name, sizeof cname, cname, NULL);
+ identity->device = 0;
+ identity->inode = 0;
+ identity->name = xstrdup (ok ? cname : file_name);
+ str_lowercase (identity->file_name);
+#endif /* Windows */
return identity;
}
{
if (identity != NULL)
{
- free (identity->normalized_file_name);
+ free (identity->name);
free (identity);
}
}
fn_compare_file_identities (const struct file_identity *a,
const struct file_identity *b)
{
- return strcasecmp (a->normalized_file_name, b->normalized_file_name);
+ if (a->device != b->device)
+ return a->device < b->device ? -1 : 1;
+ else if (a->inode != b->inode)
+ return a->inode < b->inode ? -1 : 1;
+ else if (a->name != NULL)
+ return b->name != NULL ? strcmp (a->name, b->name) : 1;
+ else
+ return b->name != NULL ? -1 : 0;
+}
+
+/* Returns a hash value for IDENTITY. */
+unsigned int
+fn_hash_identity (const struct file_identity *identity)
+{
+ unsigned int hash = identity->device ^ identity->inode;
+ if (identity->name != NULL)
+ hash ^= hsh_hash_string (identity->name);
+ return hash;
}
-#endif /* Windows */
projects / pspp-builds.git / blobdiff