Move io redirection functions to their own library

darcs-hash:20051008112051-ac50b-113caa4cba470a739e4bfbed9f479e2fed357be7.gz

1 files changed, 87 insertions, 0 deletions

diff --git a/io.h b/io.h
new file mode 100644
index 00000000..6cb103be
--- /dev/null
+++ b/io.h
@@ -0,0 +1,87 @@
+#ifndef FISH_IO_H
+#define FISH_IO_H
+
+/**
+   Describes what type of IO operation an io_data_t represents
+*/
+enum io_mode
+{
+	IO_FILE, IO_PIPE, IO_FD, IO_BUFFER, IO_CLOSE
+}
+;
+
+/** Represents an FD redirection */
+typedef struct io_data
+{
+	/** Type of redirect */
+	int io_mode;
+	/** FD to redirect */
+	int fd;
+	/** parameter for redirection */
+	union
+	{
+		/** Fds for IO_PIPE and for IO_BUFFER */
+		int pipe_fd[2];
+		/** Filename IO_FILE */
+		wchar_t *filename;
+		/** fd to redirect specified fd to, for IO_FD*/
+		int old_fd;
+	}
+	;
+	union
+	{
+		/** file creation flags to send to open for IO_FILE */
+		int flags;
+		/** buffer to save output in for IO_BUFFER */
+		buffer_t *out_buffer;		
+		/** Whether to close old_fd for IO_FD */
+		int close_old;
+		
+	}
+	;
+	
+	/** Pointer to the next IO redirection */
+	struct io_data *next;
+}
+io_data_t;
+
+ 
+/**
+   Join two chains of io redirections
+*/
+io_data_t *io_add( io_data_t *first_chain, io_data_t *decond_chain );
+
+/**
+   Remove the specified io redirection from the chain
+*/
+io_data_t *io_remove( io_data_t *list, io_data_t *element );
+
+/**
+   Make a copy of the specified chain of redirections
+*/
+io_data_t *io_duplicate( io_data_t *l );
+
+/**
+   Return the last io redirection in ht e chain for the specified file descriptor.
+*/
+io_data_t *io_get( io_data_t *io, int fd );
+
+
+
+/**
+   Free all resources used by a IO_BUFFER type io redirection.
+*/
+void io_buffer_destroy( io_data_t *io_buffer );
+
+/**
+   Create a IO_BUFFER type io redirection, complete with a pipe and a
+   buffer_t for output.
+*/
+io_data_t *io_buffer_create();
+
+/**
+   Close output pipe, and read from input pipe until eof.
+*/
+void io_buffer_read( io_data_t *d );
+
+#endif