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/*++
/* 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);
}
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