1 files changed, 314 insertions, 0 deletions
diff --git a/lib/isc/win32/dir.c b/lib/isc/win32/dir.c
new file mode 100644
index 0000000..9a512da
--- /dev/null
+++ b/lib/isc/win32/dir.c
@@ -0,0 +1,314 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0.  If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+#include <direct.h>
+#include <io.h>
+#include <process.h>
+#include <string.h>
+#include <sys/stat.h>
+
+#include <isc/assertions.h>
+#include <isc/dir.h>
+#include <isc/magic.h>
+#include <isc/print.h>
+#include <isc/string.h>
+#include <isc/util.h>
+
+#include "errno2result.h"
+
+#define ISC_DIR_MAGIC  ISC_MAGIC('D', 'I', 'R', '*')
+#define VALID_DIR(dir) ISC_MAGIC_VALID(dir, ISC_DIR_MAGIC)
+
+static isc_result_t
+start_directory(isc_dir_t *p);
+
+void
+isc_dir_init(isc_dir_t *dir) {
+	REQUIRE(dir != NULL);
+
+	dir->dirname[0] = '\0';
+
+	dir->entry.name[0] = '\0';
+	dir->entry.length = 0;
+	memset(&(dir->entry.find_data), 0, sizeof(dir->entry.find_data));
+
+	dir->entry_filled = false;
+	dir->search_handle = INVALID_HANDLE_VALUE;
+
+	dir->magic = ISC_DIR_MAGIC;
+}
+
+/*
+ * Allocate workspace and open directory stream. If either one fails,
+ * NULL will be returned.
+ */
+isc_result_t
+isc_dir_open(isc_dir_t *dir, const char *dirname) {
+	char *p;
+	isc_result_t result;
+
+	REQUIRE(dirname != NULL);
+	REQUIRE(VALID_DIR(dir) && dir->search_handle == INVALID_HANDLE_VALUE);
+
+	/*
+	 * Copy directory name.  Need to have enough space for the name,
+	 * a possible path separator, the wildcard, and the final NUL.
+	 */
+	if (strlen(dirname) + 3 > sizeof(dir->dirname)) {
+		/* XXXDCL ? */
+		return (ISC_R_NOSPACE);
+	}
+	strlcpy(dir->dirname, dirname, sizeof(dir->dirname));
+
+	/*
+	 * Append path separator, if needed, and "*".
+	 */
+	p = dir->dirname + strlen(dir->dirname);
+	if (dir->dirname < p && *(p - 1) != '\\' && *(p - 1) != ':') {
+		*p++ = '\\';
+	}
+	*p++ = '*';
+	*p = '\0';
+
+	/*
+	 * Open stream.
+	 */
+	result = start_directory(dir);
+
+	return (result);
+}
+
+/*
+ * Return previously retrieved file or get next one.  Unix's dirent has
+ * separate open and read functions, but the Win32 and DOS interfaces open
+ * the dir stream and reads the first file in one operation.
+ */
+isc_result_t
+isc_dir_read(isc_dir_t *dir) {
+	REQUIRE(VALID_DIR(dir) && dir->search_handle != INVALID_HANDLE_VALUE);
+
+	if (dir->entry_filled) {
+		/*
+		 * start_directory() already filled in the first entry.
+		 */
+		dir->entry_filled = false;
+	} else {
+		/*
+		 * Fetch next file in directory.
+		 */
+		if (FindNextFile(dir->search_handle, &dir->entry.find_data) ==
+		    FALSE)
+		{
+			/*
+			 * Either the last file has been processed or
+			 * an error has occurred.  The former is not
+			 * really an error, but the latter is.
+			 */
+			if (GetLastError() == ERROR_NO_MORE_FILES) {
+				return (ISC_R_NOMORE);
+			} else {
+				return (ISC_R_UNEXPECTED);
+			}
+		}
+	}
+
+	/*
+	 * Make sure that the space for the name is long enough.
+	 */
+	strlcpy(dir->entry.name, dir->entry.find_data.cFileName,
+		sizeof(dir->entry.name));
+	dir->entry.length = strlen(dir->entry.name);
+
+	return (ISC_R_SUCCESS);
+}
+
+/*
+ * Close directory stream.
+ */
+void
+isc_dir_close(isc_dir_t *dir) {
+	REQUIRE(VALID_DIR(dir) && dir->search_handle != INVALID_HANDLE_VALUE);
+
+	FindClose(dir->search_handle);
+	dir->search_handle = INVALID_HANDLE_VALUE;
+}
+
+/*
+ * Reposition directory stream at start.
+ */
+isc_result_t
+isc_dir_reset(isc_dir_t *dir) {
+	isc_result_t result;
+
+	REQUIRE(VALID_DIR(dir) && dir->search_handle != INVALID_HANDLE_VALUE);
+	REQUIRE(dir->dirname != NULL);
+
+	/*
+	 * NT cannot reposition the seek pointer to the beginning of the
+	 * the directory stream, but rather the directory needs to be
+	 * closed and reopened.  The latter might fail.
+	 */
+
+	isc_dir_close(dir);
+
+	result = start_directory(dir);
+
+	return (result);
+}
+
+/*
+ * Initialize isc_dir_t structure with new directory. The function
+ * returns 0 on failure and nonzero on success.
+ *
+ * Note:
+ * - Be sure to close previous stream before opening new one
+ */
+static isc_result_t
+start_directory(isc_dir_t *dir) {
+	REQUIRE(VALID_DIR(dir));
+	REQUIRE(dir->search_handle == INVALID_HANDLE_VALUE);
+
+	dir->entry_filled = false;
+
+	/*
+	 * Open stream and retrieve first file.
+	 */
+	dir->search_handle = FindFirstFile(dir->dirname, &dir->entry.find_data);
+
+	if (dir->search_handle == INVALID_HANDLE_VALUE) {
+		/*
+		 * Something went wrong but we don't know what. GetLastError()
+		 * could give us more information about the error, but the
+		 * MSDN documentation is frustratingly thin about what
+		 * possible errors could have resulted.  (Score one for
+		 * the Unix manual pages.)  So there is just this lame error
+		 * instead of being able to differentiate ISC_R_NOTFOUND
+		 * from ISC_R_UNEXPECTED.
+		 */
+		return (ISC_R_FAILURE);
+	}
+
+	/*
+	 * Make sure that the space for the name is long enough.
+	 */
+	INSIST(sizeof(dir->entry.name) >
+	       strlen(dir->entry.find_data.cFileName));
+
+	/*
+	 * Fill in the data for the first entry of the directory.
+	 */
+	strlcpy(dir->entry.name, dir->entry.find_data.cFileName,
+		sizeof(dir->entry.name));
+	dir->entry.length = strlen(dir->entry.name);
+
+	dir->entry_filled = true;
+
+	return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc_dir_chdir(const char *dirname) {
+	/*
+	 * Change the current directory to 'dirname'.
+	 */
+
+	REQUIRE(dirname != NULL);
+
+	if (chdir(dirname) < 0) {
+		return (isc__errno2result(errno));
+	}
+
+	return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc_dir_chroot(const char *dirname) {
+	return (ISC_R_NOTIMPLEMENTED);
+}
+
+isc_result_t
+isc_dir_createunique(char *templet) {
+	isc_result_t result;
+	char *x;
+	char *p;
+	int i;
+	int pid;
+
+	REQUIRE(templet != NULL);
+
+	/*
+	 * mkdtemp is not portable, so this emulates it.
+	 */
+
+	pid = getpid();
+
+	/*
+	 * Replace trailing Xs with the process-id, zero-filled.
+	 */
+	for (x = templet + strlen(templet) - 1; *x == 'X' && x >= templet;
+	     x--, pid /= 10)
+	{
+		*x = pid % 10 + '0';
+	}
+
+	x++; /* Set x to start of ex-Xs. */
+
+	do {
+		i = mkdir(templet);
+		if (i == 0) {
+			i = chmod(templet, 0700);
+		}
+
+		if (i == 0 || errno != EEXIST) {
+			break;
+		}
+
+		/*
+		 * The BSD algorithm.
+		 */
+		p = x;
+		while (*p != '\0') {
+			if (isdigit((unsigned char)*p)) {
+				*p = 'a';
+			} else if (*p != 'z') {
+				++*p;
+			} else {
+				/*
+				 * Reset character and move to next.
+				 */
+				*p++ = 'a';
+				continue;
+			}
+
+			break;
+		}
+
+		if (*p == '\0') {
+			/*
+			 * Tried all combinations.  errno should already
+			 * be EEXIST, but ensure it is anyway for
+			 * isc__errno2result().
+			 */
+			errno = EEXIST;
+			break;
+		}
+	} while (1);
+
+	if (i == -1) {
+		result = isc__errno2result(errno);
+	} else {
+		result = ISC_R_SUCCESS;
+	}
+
+	return (result);
+}