mirror of
https://gitlab.isc.org/isc-projects/bind9
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f3635bcc14
Unify the header guard style and replace the inconsistent include guards with #pragma once. The #pragma once is widely and very well supported in all compilers that BIND 9 supports, and #pragma once was already in use in several new or refactored headers. Using simpler method will also allow us to automate header guard checks as this is simpler to programatically check. For reference, here are the reasons for the change taken from Wikipedia[1]: > In the C and C++ programming languages, #pragma once is a non-standard > but widely supported preprocessor directive designed to cause the > current source file to be included only once in a single compilation. > > Thus, #pragma once serves the same purpose as include guards, but with > several advantages, including: less code, avoidance of name clashes, > and sometimes improvement in compilation speed. On the other hand, > #pragma once is not necessarily available in all compilers and its > implementation is tricky and might not always be reliable. 1. https://en.wikipedia.org/wiki/Pragma_once
102 lines
2.2 KiB
C
102 lines
2.2 KiB
C
/*
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* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, you can obtain one at https://mozilla.org/MPL/2.0/.
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*
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* See the COPYRIGHT file distributed with this work for additional
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* information regarding copyright ownership.
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*/
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/*! \file
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* \brief
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* This file is responsible for defining two operations that are not
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* directly portable between Unix-like systems and Windows NT, option
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* parsing and directory scanning. It is here because it was decided
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* that the "gen" build utility was not to depend on libisc.a, so
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* the functions declared in isc/commandline.h and isc/dir.h could not
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* be used.
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*
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* The commandline stuff is really just a wrapper around getopt().
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* The dir stuff was shrunk to fit the needs of gen.c.
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*/
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#pragma once
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#include <dirent.h>
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#include <errno.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <sys/types.h> /* Required on some systems for dirent.h. */
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#include <unistd.h> /* XXXDCL Required for ?. */
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#ifdef __cplusplus
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#define ISC_LANG_BEGINDECLS extern "C" {
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#define ISC_LANG_ENDDECLS }
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#else /* ifdef __cplusplus */
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#define ISC_LANG_BEGINDECLS
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#define ISC_LANG_ENDDECLS
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#endif /* ifdef __cplusplus */
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#ifdef NEED_OPTARG
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extern char *optarg;
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#endif /* ifdef NEED_OPTARG */
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#define isc_commandline_parse getopt
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#define isc_commandline_argument optarg
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typedef struct {
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DIR *handle;
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char *filename;
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} isc_dir_t;
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ISC_LANG_BEGINDECLS
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static bool
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start_directory(const char *path, isc_dir_t *dir) {
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dir->handle = opendir(path);
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if (dir->handle != NULL) {
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return (true);
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} else {
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return (false);
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}
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}
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static bool
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next_file(isc_dir_t *dir) {
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struct dirent *dirent;
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dir->filename = NULL;
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if (dir->handle != NULL) {
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errno = 0;
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dirent = readdir(dir->handle);
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if (dirent != NULL) {
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dir->filename = dirent->d_name;
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} else {
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if (errno != 0) {
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exit(1);
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}
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}
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}
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if (dir->filename != NULL) {
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return (true);
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} else {
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return (false);
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}
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}
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static void
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end_directory(isc_dir_t *dir) {
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if (dir->handle != NULL) {
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(void)closedir(dir->handle);
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}
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dir->handle = NULL;
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}
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ISC_LANG_ENDDECLS
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