Adding upstream version 3.4.23.upstream/3.4.23upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 216 insertions, 0 deletions

diff --git a/src/util/scan_dir.c b/src/util/scan_dir.c
new file mode 100644
index 0000000..d94c674
--- /dev/null
+++ b/src/util/scan_dir.c
@@ -0,0 +1,216 @@
+/*++
+/* NAME
+/*	scan_dir 3
+/* SUMMARY
+/*	directory scanning
+/* SYNOPSIS
+/*	#include <scan_dir.h>
+/*
+/*	SCAN_DIR *scan_dir_open(path)
+/*	const char *path;
+/*
+/*	char	*scan_dir_next(scan)
+/*	SCAN_DIR *scan;
+/*
+/*	char	*scan_dir_path(scan)
+/*	SCAN_DIR *scan;
+/*
+/*	void	scan_push(scan, entry)
+/*	SCAN_DIR *scan;
+/*	const char *entry;
+/*
+/*	SCAN_DIR *scan_pop(scan)
+/*	SCAN_DIR *scan;
+/*
+/*	SCAN_DIR *scan_dir_close(scan)
+/*	SCAN_DIR *scan;
+/* DESCRIPTION
+/*	These functions scan directories for names. The "." and
+/*	".." names are skipped. Essentially, this is <dirent>
+/*	extended with error handling and with knowledge of the
+/*	name of the directory being scanned.
+/*
+/*	scan_dir_open() opens the named directory and
+/*	returns a handle for subsequent use.
+/*
+/*	scan_dir_close() terminates the directory scan, cleans up
+/*	and returns a null pointer.
+/*
+/*	scan_dir_next() returns the next requested object in the specified
+/*	directory. It skips the "." and ".." entries.
+/*
+/*	scan_dir_path() returns the name of the directory being scanned.
+/*
+/*	scan_dir_push() causes the specified directory scan to enter the
+/*	named subdirectory.
+/*
+/*	scan_dir_pop() leaves the directory being scanned and returns
+/*	to the previous one. The result is the argument, null if no
+/*	previous directory information is available.
+/* DIAGNOSTICS
+/*	All errors are fatal.
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Wietse Venema
+/*	IBM T.J. Watson Research
+/*	P.O. Box 704
+/*	Yorktown Heights, NY 10598, USA
+/*
+/*	Wietse Venema
+/*	Google, Inc.
+/*	111 8th Avenue
+/*	New York, NY 10011, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#ifdef HAVE_DIRENT_H
+#include <dirent.h>
+#else
+#define dirent direct
+#ifdef HAVE_SYS_NDIR_H
+#include <sys/ndir.h>
+#endif
+#ifdef HAVE_SYS_DIR_H
+#include <sys/dir.h>
+#endif
+#ifdef HAVE_NDIR_H
+#include <ndir.h>
+#endif
+#endif
+#include <string.h>
+#include <errno.h>
+
+/* Utility library. */
+
+#include "msg.h"
+#include "mymalloc.h"
+#include "stringops.h"
+#include "vstring.h"
+#include "scan_dir.h"
+
+ /*
+  * The interface is based on an opaque structure, so we don't have to expose
+  * the user to the guts. Subdirectory info sits in front of parent directory
+  * info: a simple last-in, first-out list.
+  */
+typedef struct SCAN_INFO SCAN_INFO;
+
+struct SCAN_INFO {
+    char   *path;			/* directory name */
+    DIR    *dir;			/* directory structure */
+    SCAN_INFO *parent;			/* linkage */
+};
+struct SCAN_DIR {
+    SCAN_INFO *current;			/* current scan */
+};
+
+#define SCAN_DIR_PATH(scan)	(scan->current->path)
+#define STR(x)			vstring_str(x)
+
+/* scan_dir_path - return the path of the directory being read.  */
+
+char   *scan_dir_path(SCAN_DIR *scan)
+{
+    return (SCAN_DIR_PATH(scan));
+}
+
+/* scan_dir_push - enter directory */
+
+void    scan_dir_push(SCAN_DIR *scan, const char *path)
+{
+    const char *myname = "scan_dir_push";
+    SCAN_INFO *info;
+
+    info = (SCAN_INFO *) mymalloc(sizeof(*info));
+    if (scan->current)
+	info->path = concatenate(SCAN_DIR_PATH(scan), "/", path, (char *) 0);
+    else
+	info->path = mystrdup(path);
+    if ((info->dir = opendir(info->path)) == 0)
+	msg_fatal("%s: open directory %s: %m", myname, info->path);
+    if (msg_verbose > 1)
+	msg_info("%s: open %s", myname, info->path);
+    info->parent = scan->current;
+    scan->current = info;
+}
+
+/* scan_dir_pop - leave directory */
+
+SCAN_DIR *scan_dir_pop(SCAN_DIR *scan)
+{
+    const char *myname = "scan_dir_pop";
+    SCAN_INFO *info = scan->current;
+    SCAN_INFO *parent;
+
+    if (info == 0)
+	return (0);
+    parent = info->parent;
+    if (closedir(info->dir))
+	msg_fatal("%s: close directory %s: %m", myname, info->path);
+    if (msg_verbose > 1)
+	msg_info("%s: close %s", myname, info->path);
+    myfree(info->path);
+    myfree((void *) info);
+    scan->current = parent;
+    return (parent ? scan : 0);
+}
+
+/* scan_dir_open - start directory scan */
+
+SCAN_DIR *scan_dir_open(const char *path)
+{
+    SCAN_DIR *scan;
+
+    scan = (SCAN_DIR *) mymalloc(sizeof(*scan));
+    scan->current = 0;
+    scan_dir_push(scan, path);
+    return (scan);
+}
+
+/* scan_dir_next - find next entry */
+
+char   *scan_dir_next(SCAN_DIR *scan)
+{
+    const char *myname = "scan_dir_next";
+    SCAN_INFO *info = scan->current;
+    struct dirent *dp;
+
+#define STREQ(x,y)	(strcmp((x),(y)) == 0)
+
+    if (info) {
+
+	/*
+	 * Fix 20150421: readdir() does not reset errno after reaching the
+	 * end-of-directory. This dates back all the way to the initial
+	 * implementation of 19970309.
+	 */
+	errno = 0;
+	while ((dp = readdir(info->dir)) != 0) {
+	    if (STREQ(dp->d_name, ".") || STREQ(dp->d_name, "..")) {
+		if (msg_verbose > 1)
+		    msg_info("%s: skip %s", myname, dp->d_name);
+		continue;
+	    } else {
+		if (msg_verbose > 1)
+		    msg_info("%s: found %s", myname, dp->d_name);
+		return (dp->d_name);
+	    }
+	}
+    }
+    return (0);
+}
+
+/* scan_dir_close - terminate directory scan */
+
+SCAN_DIR *scan_dir_close(SCAN_DIR *scan)
+{
+    while (scan->current)
+	scan_dir_pop(scan);
+    myfree((void *) scan);
+    return (0);
+}