Implement -printf/-fprintf

Based on a patch by Fangrui Song <i@maskray.me>.
Closes #16.

1 files changed, 62 insertions, 0 deletions

diff --git a/printf.h b/printf.h
new file mode 100644
index 0000000..34eda0a
--- /dev/null
+++ b/printf.h
@@ -0,0 +1,62 @@
+/*********************************************************************
+ * 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_PRINTF_H
+#define BFS_PRINTF_H
+
+#include "bftw.h"
+#include "color.h"
+#include <stdbool.h>
+#include <stdio.h>
+
+struct bfs_printf_directive;
+
+/**
+ * A printf command, the result of parsing a single format string.
+ */
+struct bfs_printf {
+	/** The chain of printf directives. */
+	struct bfs_printf_directive *directives;
+	/** Whether the struct stat must be filled in. */
+	bool needs_stat;
+};
+
+/**
+ * Parse a -printf format string.
+ *
+ * @param format
+ *         The format string to parse.
+ * @param stderr_colors
+ *         Color table for printing error messages.
+ * @return The parsed printf command, or NULL on failure.
+ */
+struct bfs_printf *parse_bfs_printf(const char *format, const struct colors *stderr_colors);
+
+/**
+ * Evaluate a parsed format string.
+ *
+ * @param file
+ *         The FILE to print to.
+ * @param command
+ *         The parsed printf format.
+ * @param ftwbuf
+ *         The bftw() data for the current file.  If needs_stat is true, statbuf
+ *         must be non-NULL.
+ * @return 0 on success, -1 on failure.
+ */
+int bfs_printf(FILE *file, const struct bfs_printf *command, const struct BFTW *ftwbuf);
+
+/**
+ * Free a parsed format string.
+ */
+void free_bfs_printf(struct bfs_printf *command);
+
+#endif // BFS_PRINTF_H