Implement -exec/-execdir ... +

1 files changed, 103 insertions, 0 deletions

diff --git a/exec.h b/exec.h
new file mode 100644
index 0000000..ab548af
--- /dev/null
+++ b/exec.h
@@ -0,0 +1,103 @@
+/*********************************************************************
+ * bfs                                                               *
+ * Copyright (C) 2017 Tavian Barnes <tavianator@tavianator.com>      *
+ *                                                                   *
+ * This program is free software. It comes without any warranty, to  *
+ * the extent permitted by applicable law. You can redistribute it   *
+ * and/or modify it under the terms of the Do What The Fuck You Want *
+ * To Public License, Version 2, as published by Sam Hocevar. See    *
+ * the COPYING file or http://www.wtfpl.net/ for more details.       *
+ *********************************************************************/
+
+#ifndef BFS_EXEC_H
+#define BFS_EXEC_H
+
+#include "bftw.h"
+#include "color.h"
+
+/**
+ * Flags for the -exec actions.
+ */
+enum bfs_exec_flags {
+	/** Prompt the user before executing (-ok, -okdir). */
+	BFS_EXEC_CONFIRM = 1 << 0,
+	/** Run the command in the file's parent directory (-execdir, -okdir). */
+	BFS_EXEC_CHDIR   = 1 << 1,
+	/** Pass multiple files at once to the command (-exec ... {} +). */
+	BFS_EXEC_MULTI   = 1 << 2,
+};
+
+/**
+ * Buffer for a command line to be executed.
+ */
+struct bfs_exec {
+	/** Flags for this exec buffer. */
+	enum bfs_exec_flags flags;
+
+	/** Command line template. */
+	char **tmpl_argv;
+	/** Command line template size. */
+	size_t tmpl_argc;
+
+	/** For BFS_EXEC_MULTI, the index of the placeholder argument. */
+	size_t placeholder;
+
+	/** The built command line. */
+	char **argv;
+	/** Number of command line arguments. */
+	size_t argc;
+	/** Maximum argc before E2BIG. */
+	size_t arg_max;
+
+	/** A file descriptor for the working directory, for BFS_EXEC_CHDIR. */
+	int wd_fd;
+	/** The path to the working directory, for BFS_EXEC_CHDIR. */
+	char *wd_path;
+	/** Length of the working directory path. */
+	size_t wd_len;
+
+	/** The ultimate return value for bfs_exec_finish(). */
+	int ret;
+};
+
+/**
+ * Parse an exec action.
+ *
+ * @param argv
+ *         The (bfs) command line argument to parse.
+ * @param flags
+ *         Any flags for this exec action.
+ * @param cerr
+ *         For error messages.
+ * @return The parsed exec action, or NULL on failure.
+ */
+struct bfs_exec *parse_bfs_exec(char **argv, enum bfs_exec_flags flags, CFILE *cerr);
+
+/**
+ * Execute the command for a file.
+ *
+ * @param execbuf
+ *         The parsed exec action.
+ * @param ftwbuf
+ *         The bftw() data for the current file.
+ * @return 0 if the command succeeded, -1 if it failed.  If the command could
+ *         be executed, -1 is returned, and errno will be non-zero.  For
+ *         BFS_EXEC_MULTI, errors will not be reported until bfs_exec_finish().
+ */
+int bfs_exec(struct bfs_exec *execbuf, const struct BFTW *ftwbuf);
+
+/**
+ * Finish executing any commands.
+ *
+ * @param execbuf
+ *         The parsed exec action.
+ * @return 0 on success, -1 if any errors were encountered.
+ */
+int bfs_exec_finish(struct bfs_exec *execbuf);
+
+/**
+ * Free a parsed exec action.
+ */
+void free_bfs_exec(struct bfs_exec *execbuf);
+
+#endif // BFS_EXEC_H