busybox/libbb/recursive_action.c

/* vi: set sw=4 ts=4: */
/*
 * Utility routines.
 *
 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

#include "libbb.h"

#undef DEBUG_RECURS_ACTION


/*
 * Walk down all the directories under the specified
 * location, and do something (something specified
 * by the fileAction and dirAction function pointers).
 *
 * Unfortunately, while nftw(3) could replace this and reduce
 * code size a bit, nftw() wasn't supported before GNU libc 2.1,
 * and so isn't sufficiently portable to take over since glibc2.1
 * is so stinking huge.
 */
int recursive_action(const char *fileName,
					int recurse, int followLinks, int depthFirst,
					int (*fileAction) (const char *fileName,
									   struct stat * statbuf,
									   void* userData),
					int (*dirAction) (const char *fileName,
									  struct stat * statbuf,
									  void* userData),
					void* userData)
{
	int status;
	struct stat statbuf;
	struct dirent *next;

	if (followLinks)
		status = stat(fileName, &statbuf);
	else
		status = lstat(fileName, &statbuf);

	if (status < 0) {
#ifdef DEBUG_RECURS_ACTION
		bb_error_msg("status=%d followLinks=%d TRUE=%d",
				status, followLinks, TRUE);
#endif
		bb_perror_msg("%s", fileName);
		return FALSE;
	}

	if (! followLinks && (S_ISLNK(statbuf.st_mode))) {
		if (fileAction == NULL)
			return TRUE;
		else
			return fileAction(fileName, &statbuf, userData);
	}

	if (! recurse) {
		if (S_ISDIR(statbuf.st_mode)) {
			if (dirAction != NULL)
				return (dirAction(fileName, &statbuf, userData));
			else
				return TRUE;
		}
	}

	if (S_ISDIR(statbuf.st_mode)) {
		DIR *dir;

		if (dirAction != NULL && ! depthFirst) {
			status = dirAction(fileName, &statbuf, userData);
			if (! status) {
				bb_perror_msg("%s", fileName);
				return FALSE;
			} else if (status == SKIP)
				return TRUE;
		}
		dir = opendir(fileName);
		if (!dir) {
			return FALSE;
		}
		status = TRUE;
		while ((next = readdir(dir)) != NULL) {
			char *nextFile;

			nextFile = concat_subpath_file(fileName, next->d_name);
			if(nextFile == NULL)
				continue;
			if (! recursive_action(nextFile, TRUE, followLinks, depthFirst,
						fileAction, dirAction, userData)) {
				status = FALSE;
			}
			free(nextFile);
		}
		closedir(dir);
		if (dirAction != NULL && depthFirst) {
			if (! dirAction(fileName, &statbuf, userData)) {
				bb_perror_msg("%s", fileName);
				return FALSE;
			}
		}
		if (! status)
			return FALSE;
	} else {
		if (fileAction == NULL)
			return TRUE;
		else
			return fileAction(fileName, &statbuf, userData);
	}
	return TRUE;
}