busybox
Public
Mirror of git://git.busybox.net/busybox with our patches on top
Source
committed fe7cd642b0bstatic void puts_maybe_newline(char *s, FILE *file, char *last_puts_char, char last_gets_char)/* vi: set sw=4 ts=4: *//* * sed.c - very minimalist version of sed * * Copyright (C) 1999,2000,2001 by Lineo, inc. and Mark Whitley * Copyright (C) 1999,2000,2001 by Mark Whitley <markw@codepoet.org> * Copyright (C) 2002 Matt Kraai * Copyright (C) 2003 by Glenn McGrath <bug1@iinet.net.au> * Copyright (C) 2003,2004 by Rob Landley <rob@landley.net> * * MAINTAINER: Rob Landley <rob@landley.net> * * Licensed under GPL version 2, see file LICENSE in this tarball for details. *//* Code overview. Files are laid out to avoid unnecessary function declarations. So for example, every function add_cmd calls occurs before add_cmd in this file. add_cmd() is called on each line of sed command text (from a file or from the command line). It calls get_address() and parse_cmd_args(). The resulting sed_cmd_t structures are appended to a linked list (G.sed_cmd_head/G.sed_cmd_tail). add_input_file() adds a FILE * to the list of input files. We need to know all input sources ahead of time to find the last line for the $ match. process_files() does actual sedding, reading data lines from each input FILE * (which could be stdin) and applying the sed command list (sed_cmd_head) to each of the resulting lines. sed_main() is where external code calls into this, with a command line.*//* Supported features and commands in this version of sed: - comments ('#') - address matching: num|/matchstr/[,num|/matchstr/|$]command - commands: (p)rint, (d)elete, (s)ubstitue (with g & I flags) - edit commands: (a)ppend, (i)nsert, (c)hange - file commands: (r)ead - backreferences in substitution expressions (\0, \1, \2...\9) - grouped commands: {cmd1;cmd2} - transliteration (y/source-chars/dest-chars/) - pattern space hold space storing / swapping (g, h, x) - labels / branching (: label, b, t, T) (Note: Specifying an address (range) to match is *optional*; commands default to the whole pattern space if no specific address match was requested.) Todo: - Create a wrapper around regex to make libc's regex conform with sed Reference http://www.opengroup.org/onlinepubs/007904975/utilities/sed.html*/