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authorトトも <85485984+ElectronicsArchiver@users.noreply.github.com>2022-04-16 20:18:56 +0200
committerGitHub <noreply@github.com>2022-04-16 14:18:56 -0400
commit33cc3b9dd7bf3dae1c6cf86e46bb4923f96e7fff (patch)
tree02fb808d19aee560ac9d381ca5a52509881cdd44 /src/main.c
parent8f5a73a6585bd425807430fd80ce1e3a737f4c5f (diff)
downloadbfs-33cc3b9dd7bf3dae1c6cf86e46bb4923f96e7fff.tar.xz
Source / Include Folder (#88)
Moved Source Files Into `src` Folder
Diffstat (limited to 'src/main.c')
-rw-r--r--src/main.c141
1 files changed, 141 insertions, 0 deletions
diff --git a/src/main.c b/src/main.c
new file mode 100644
index 0000000..9dc96e4
--- /dev/null
+++ b/src/main.c
@@ -0,0 +1,141 @@
+/****************************************************************************
+ * bfs *
+ * Copyright (C) 2015-2022 Tavian Barnes <tavianator@tavianator.com> *
+ * *
+ * Permission to use, copy, modify, and/or distribute this software for any *
+ * purpose with or without fee is hereby granted. *
+ * *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES *
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF *
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR *
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES *
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN *
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF *
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. *
+ ****************************************************************************/
+
+/**
+ * - main(): the entry point for bfs(1), a breadth-first version of find(1)
+ * - main.c (this file)
+ *
+ * - bfs_parse_cmdline(): parses the command line into an expression tree
+ * - ctx.[ch] (struct bfs_ctx, the overall bfs context)
+ * - expr.h (declares the expression tree nodes)
+ * - parse.[ch] (the parser itself)
+ * - opt.[ch] (the optimizer)
+ *
+ * - bfs_eval(): runs the expression on every file it sees
+ * - eval.[ch] (the main evaluation functions)
+ * - exec.[ch] (implements -exec[dir]/-ok[dir])
+ * - printf.[ch] (implements -[f]printf)
+ *
+ * - bftw(): used by bfs_eval() to walk the directory tree(s)
+ * - bftw.[ch] (an extended version of nftw(3))
+ *
+ * - Utilities:
+ * - bfs.h (constants about bfs itself)
+ * - bar.[ch] (a terminal status bar)
+ * - color.[ch] (for pretty terminal colors)
+ * - darray.[ch] (a dynamic array library)
+ * - diag.[ch] (formats diagnostic messages)
+ * - dir.[ch] (a directory API facade)
+ * - dstring.[ch] (a dynamic string library)
+ * - fsade.[ch] (a facade over non-standard filesystem features)
+ * - mtab.[ch] (parses the system's mount table)
+ * - pwcache.[ch] (a cache for the user/group tables)
+ * - stat.[ch] (wraps stat(), or statx() on Linux)
+ * - trie.[ch] (a trie set/map implementation)
+ * - typo.[ch] (fuzzy matching for typos)
+ * - util.[ch] (everything else)
+ * - xregex.[ch] (regular expression support)
+ * - xspawn.[ch] (spawns processes)
+ * - xtime.[ch] (date/time handling utilities)
+ */
+
+#include "ctx.h"
+#include "eval.h"
+#include "parse.h"
+#include "util.h"
+#include <errno.h>
+#include <fcntl.h>
+#include <locale.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+/**
+ * Check if a file descriptor is open.
+ */
+static bool isopen(int fd) {
+ return fcntl(fd, F_GETFD) >= 0 || errno != EBADF;
+}
+
+/**
+ * Open a file and redirect it to a particular descriptor.
+ */
+static int redirect(int fd, const char *path, int flags) {
+ int newfd = open(path, flags);
+ if (newfd < 0 || newfd == fd) {
+ return newfd;
+ }
+
+ int ret = dup2(newfd, fd);
+ close_quietly(newfd);
+ return ret;
+}
+
+/**
+ * Make sure the standard streams std{in,out,err} are open. If they are not,
+ * future open() calls may use those file descriptors, and std{in,out,err} will
+ * use them unintentionally.
+ */
+static int open_std_streams(void) {
+#ifdef O_PATH
+ const int inflags = O_PATH, outflags = O_PATH;
+#else
+ // These are intentionally backwards so that bfs >&- still fails with EBADF
+ const int inflags = O_WRONLY, outflags = O_RDONLY;
+#endif
+
+ if (!isopen(STDERR_FILENO) && redirect(STDERR_FILENO, "/dev/null", outflags) < 0) {
+ return -1;
+ }
+ if (!isopen(STDOUT_FILENO) && redirect(STDOUT_FILENO, "/dev/null", outflags) < 0) {
+ perror("redirect()");
+ return -1;
+ }
+ if (!isopen(STDIN_FILENO) && redirect(STDIN_FILENO, "/dev/null", inflags) < 0) {
+ perror("redirect()");
+ return -1;
+ }
+
+ return 0;
+}
+
+/**
+ * bfs entry point.
+ */
+int main(int argc, char *argv[]) {
+ int ret = EXIT_FAILURE;
+
+ // Make sure the standard streams are open
+ if (open_std_streams() != 0) {
+ goto done;
+ }
+
+ // Use the system locale instead of "C"
+ setlocale(LC_ALL, "");
+
+ struct bfs_ctx *ctx = bfs_parse_cmdline(argc, argv);
+ if (ctx) {
+ ret = bfs_eval(ctx);
+ }
+
+ if (bfs_ctx_free(ctx) != 0 && ret == EXIT_SUCCESS) {
+ ret = EXIT_FAILURE;
+ }
+
+done:
+ return ret;
+}