diff options
Diffstat (limited to 'main.c')
| -rw-r--r-- | main.c | 141 |
1 files changed, 0 insertions, 141 deletions
@@ -1,141 +0,0 @@ -/**************************************************************************** - * 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; -} |