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-rw-r--r--src/util/scan_dir.c216
1 files changed, 216 insertions, 0 deletions
diff --git a/src/util/scan_dir.c b/src/util/scan_dir.c
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+++ 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);
+}