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1396 lines
36 KiB
C
1396 lines
36 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* sed.c - very minimalist version of sed
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*
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* Copyright (C) 1999,2000,2001 by Lineo, inc. and Mark Whitley
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* Copyright (C) 1999,2000,2001 by Mark Whitley <markw@codepoet.org>
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* Copyright (C) 2002 Matt Kraai
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* Copyright (C) 2003 by Glenn McGrath
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* Copyright (C) 2003,2004 by Rob Landley <rob@landley.net>
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*
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* MAINTAINER: Rob Landley <rob@landley.net>
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*
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* Licensed under GPL version 2, see file LICENSE in this tarball for details.
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*/
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/* Code overview.
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Files are laid out to avoid unnecessary function declarations. So for
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example, every function add_cmd calls occurs before add_cmd in this file.
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add_cmd() is called on each line of sed command text (from a file or from
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the command line). It calls get_address() and parse_cmd_args(). The
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resulting sed_cmd_t structures are appended to a linked list
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(G.sed_cmd_head/G.sed_cmd_tail).
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add_input_file() adds a FILE* to the list of input files. We need to
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know all input sources ahead of time to find the last line for the $ match.
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process_files() does actual sedding, reading data lines from each input FILE *
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(which could be stdin) and applying the sed command list (sed_cmd_head) to
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each of the resulting lines.
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sed_main() is where external code calls into this, with a command line.
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*/
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/*
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Supported features and commands in this version of sed:
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- comments ('#')
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- address matching: num|/matchstr/[,num|/matchstr/|$]command
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- commands: (p)rint, (d)elete, (s)ubstitue (with g & I flags)
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- edit commands: (a)ppend, (i)nsert, (c)hange
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- file commands: (r)ead
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- backreferences in substitution expressions (\0, \1, \2...\9)
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- grouped commands: {cmd1;cmd2}
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- transliteration (y/source-chars/dest-chars/)
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- pattern space hold space storing / swapping (g, h, x)
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- labels / branching (: label, b, t, T)
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(Note: Specifying an address (range) to match is *optional*; commands
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default to the whole pattern space if no specific address match was
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requested.)
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Todo:
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- Create a wrapper around regex to make libc's regex conform with sed
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Reference http://www.opengroup.org/onlinepubs/007904975/utilities/sed.html
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*/
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#include "libbb.h"
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#include "xregex.h"
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enum {
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OPT_in_place = 1 << 0,
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};
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/* Each sed command turns into one of these structures. */
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typedef struct sed_cmd_s {
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/* Ordered by alignment requirements: currently 36 bytes on x86 */
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struct sed_cmd_s *next; /* Next command (linked list, NULL terminated) */
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/* address storage */
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regex_t *beg_match; /* sed -e '/match/cmd' */
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regex_t *end_match; /* sed -e '/match/,/end_match/cmd' */
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regex_t *sub_match; /* For 's/sub_match/string/' */
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int beg_line; /* 'sed 1p' 0 == apply commands to all lines */
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int end_line; /* 'sed 1,3p' 0 == one line only. -1 = last line ($) */
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FILE *sw_file; /* File (sw) command writes to, -1 for none. */
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char *string; /* Data string for (saicytb) commands. */
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unsigned which_match; /* (s) Which match to replace (0 for all) */
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/* Bitfields (gcc won't group them if we don't) */
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unsigned invert:1; /* the '!' after the address */
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unsigned in_match:1; /* Next line also included in match? */
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unsigned sub_p:1; /* (s) print option */
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char sw_last_char; /* Last line written by (sw) had no '\n' */
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/* GENERAL FIELDS */
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char cmd; /* The command char: abcdDgGhHilnNpPqrstwxy:={} */
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} sed_cmd_t;
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static const char semicolon_whitespace[] ALIGN1 = "; \n\r\t\v";
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struct globals {
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/* options */
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int be_quiet, regex_type;
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FILE *nonstdout;
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char *outname, *hold_space;
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/* List of input files */
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int input_file_count, current_input_file;
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FILE **input_file_list;
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regmatch_t regmatch[10];
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regex_t *previous_regex_ptr;
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/* linked list of sed commands */
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sed_cmd_t sed_cmd_head, *sed_cmd_tail;
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/* Linked list of append lines */
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llist_t *append_head;
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char *add_cmd_line;
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struct pipeline {
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char *buf; /* Space to hold string */
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int idx; /* Space used */
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int len; /* Space allocated */
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} pipeline;
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} FIX_ALIASING;
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#define G (*(struct globals*)&bb_common_bufsiz1)
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struct BUG_G_too_big {
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char BUG_G_too_big[sizeof(G) <= COMMON_BUFSIZE ? 1 : -1];
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};
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#define INIT_G() do { \
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G.sed_cmd_tail = &G.sed_cmd_head; \
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} while (0)
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#if ENABLE_FEATURE_CLEAN_UP
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static void sed_free_and_close_stuff(void)
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{
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sed_cmd_t *sed_cmd = G.sed_cmd_head.next;
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llist_free(G.append_head, free);
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while (sed_cmd) {
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sed_cmd_t *sed_cmd_next = sed_cmd->next;
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if (sed_cmd->sw_file)
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xprint_and_close_file(sed_cmd->sw_file);
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if (sed_cmd->beg_match) {
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regfree(sed_cmd->beg_match);
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free(sed_cmd->beg_match);
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}
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if (sed_cmd->end_match) {
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regfree(sed_cmd->end_match);
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free(sed_cmd->end_match);
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}
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if (sed_cmd->sub_match) {
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regfree(sed_cmd->sub_match);
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free(sed_cmd->sub_match);
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}
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free(sed_cmd->string);
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free(sed_cmd);
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sed_cmd = sed_cmd_next;
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}
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free(G.hold_space);
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while (G.current_input_file < G.input_file_count)
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fclose(G.input_file_list[G.current_input_file++]);
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}
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#else
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void sed_free_and_close_stuff(void);
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#endif
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/* If something bad happens during -i operation, delete temp file */
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static void cleanup_outname(void)
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{
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if (G.outname) unlink(G.outname);
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}
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/* strcpy, replacing "\from" with 'to'. If to is NUL, replacing "\any" with 'any' */
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static void parse_escapes(char *dest, const char *string, int len, char from, char to)
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{
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int i = 0;
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while (i < len) {
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if (string[i] == '\\') {
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if (!to || string[i+1] == from) {
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*dest++ = to ? to : string[i+1];
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i += 2;
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continue;
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}
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*dest++ = string[i++];
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}
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/* TODO: is it safe wrt a string with trailing '\\' ? */
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*dest++ = string[i++];
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}
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*dest = '\0';
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}
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static char *copy_parsing_escapes(const char *string, int len)
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{
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char *dest = xmalloc(len + 1);
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parse_escapes(dest, string, len, 'n', '\n');
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/* GNU sed also recognizes \t */
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parse_escapes(dest, dest, strlen(dest), 't', '\t');
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return dest;
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}
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/*
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* index_of_next_unescaped_regexp_delim - walks left to right through a string
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* beginning at a specified index and returns the index of the next regular
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* expression delimiter (typically a forward slash ('/')) not preceded by
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* a backslash ('\'). A negative delimiter disables square bracket checking.
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*/
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static int index_of_next_unescaped_regexp_delim(int delimiter, const char *str)
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{
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int bracket = -1;
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int escaped = 0;
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int idx = 0;
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char ch;
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if (delimiter < 0) {
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bracket--;
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delimiter = -delimiter;
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}
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for (; (ch = str[idx]); idx++) {
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if (bracket >= 0) {
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if (ch == ']' && !(bracket == idx - 1 || (bracket == idx - 2
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&& str[idx - 1] == '^')))
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bracket = -1;
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} else if (escaped)
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escaped = 0;
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else if (ch == '\\')
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escaped = 1;
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else if (bracket == -1 && ch == '[')
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bracket = idx;
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else if (ch == delimiter)
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return idx;
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}
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/* if we make it to here, we've hit the end of the string */
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bb_error_msg_and_die("unmatched '%c'", delimiter);
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}
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/*
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* Returns the index of the third delimiter
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*/
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static int parse_regex_delim(const char *cmdstr, char **match, char **replace)
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{
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const char *cmdstr_ptr = cmdstr;
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char delimiter;
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int idx = 0;
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/* verify that the 's' or 'y' is followed by something. That something
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* (typically a 'slash') is now our regexp delimiter... */
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if (*cmdstr == '\0')
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bb_error_msg_and_die("bad format in substitution expression");
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delimiter = *cmdstr_ptr++;
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/* save the match string */
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idx = index_of_next_unescaped_regexp_delim(delimiter, cmdstr_ptr);
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*match = copy_parsing_escapes(cmdstr_ptr, idx);
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/* save the replacement string */
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cmdstr_ptr += idx + 1;
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idx = index_of_next_unescaped_regexp_delim(-delimiter, cmdstr_ptr);
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*replace = copy_parsing_escapes(cmdstr_ptr, idx);
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return ((cmdstr_ptr - cmdstr) + idx);
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}
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/*
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* returns the index in the string just past where the address ends.
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*/
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static int get_address(const char *my_str, int *linenum, regex_t ** regex)
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{
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const char *pos = my_str;
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if (isdigit(*my_str)) {
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*linenum = strtol(my_str, (char**)&pos, 10);
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/* endstr shouldnt ever equal NULL */
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} else if (*my_str == '$') {
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*linenum = -1;
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pos++;
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} else if (*my_str == '/' || *my_str == '\\') {
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int next;
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char delimiter;
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char *temp;
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delimiter = '/';
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if (*my_str == '\\') delimiter = *++pos;
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next = index_of_next_unescaped_regexp_delim(delimiter, ++pos);
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temp = copy_parsing_escapes(pos, next);
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*regex = xmalloc(sizeof(regex_t));
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xregcomp(*regex, temp, G.regex_type|REG_NEWLINE);
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free(temp);
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/* Move position to next character after last delimiter */
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pos += (next+1);
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}
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return pos - my_str;
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}
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/* Grab a filename. Whitespace at start is skipped, then goes to EOL. */
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static int parse_file_cmd(/*sed_cmd_t *sed_cmd,*/ const char *filecmdstr, char **retval)
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{
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int start = 0, idx, hack = 0;
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/* Skip whitespace, then grab filename to end of line */
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while (isspace(filecmdstr[start]))
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start++;
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idx = start;
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while (filecmdstr[idx] && filecmdstr[idx] != '\n')
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idx++;
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/* If lines glued together, put backslash back. */
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if (filecmdstr[idx] == '\n')
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hack = 1;
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if (idx == start)
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bb_error_msg_and_die("empty filename");
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*retval = xstrndup(filecmdstr+start, idx-start+hack+1);
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if (hack)
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(*retval)[idx] = '\\';
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return idx;
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}
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static int parse_subst_cmd(sed_cmd_t *sed_cmd, const char *substr)
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{
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int cflags = G.regex_type;
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char *match;
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int idx;
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/*
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* A substitution command should look something like this:
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* s/match/replace/ #gIpw
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* || | |||
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* mandatory optional
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*/
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idx = parse_regex_delim(substr, &match, &sed_cmd->string);
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/* determine the number of back references in the match string */
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/* Note: we compute this here rather than in the do_subst_command()
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* function to save processor time, at the expense of a little more memory
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* (4 bits) per sed_cmd */
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/* process the flags */
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sed_cmd->which_match = 1;
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while (substr[++idx]) {
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/* Parse match number */
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if (isdigit(substr[idx])) {
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if (match[0] != '^') {
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/* Match 0 treated as all, multiple matches we take the last one. */
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const char *pos = substr + idx;
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/* FIXME: error check? */
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sed_cmd->which_match = (unsigned)strtol(substr+idx, (char**) &pos, 10);
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idx = pos - substr;
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}
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continue;
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}
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/* Skip spaces */
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if (isspace(substr[idx]))
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continue;
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switch (substr[idx]) {
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/* Replace all occurrences */
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case 'g':
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if (match[0] != '^')
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sed_cmd->which_match = 0;
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break;
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/* Print pattern space */
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case 'p':
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sed_cmd->sub_p = 1;
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break;
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/* Write to file */
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case 'w':
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{
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char *temp;
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idx += parse_file_cmd(/*sed_cmd,*/ substr+idx, &temp);
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break;
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}
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/* Ignore case (gnu exension) */
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case 'I':
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cflags |= REG_ICASE;
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break;
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/* Comment */
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case '#':
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// while (substr[++idx]) continue;
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idx += strlen(substr + idx); // same
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/* Fall through */
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/* End of command */
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case ';':
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case '}':
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goto out;
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default:
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bb_error_msg_and_die("bad option in substitution expression");
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}
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}
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out:
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/* compile the match string into a regex */
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if (*match != '\0') {
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/* If match is empty, we use last regex used at runtime */
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sed_cmd->sub_match = xmalloc(sizeof(regex_t));
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xregcomp(sed_cmd->sub_match, match, cflags);
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}
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free(match);
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return idx;
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}
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/*
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* Process the commands arguments
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*/
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static const char *parse_cmd_args(sed_cmd_t *sed_cmd, const char *cmdstr)
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{
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/* handle (s)ubstitution command */
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if (sed_cmd->cmd == 's')
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cmdstr += parse_subst_cmd(sed_cmd, cmdstr);
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/* handle edit cmds: (a)ppend, (i)nsert, and (c)hange */
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else if (strchr("aic", sed_cmd->cmd)) {
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if ((sed_cmd->end_line || sed_cmd->end_match) && sed_cmd->cmd != 'c')
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bb_error_msg_and_die("only a beginning address can be specified for edit commands");
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for (;;) {
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if (*cmdstr == '\n' || *cmdstr == '\\') {
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cmdstr++;
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break;
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}
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if (!isspace(*cmdstr))
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break;
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cmdstr++;
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}
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sed_cmd->string = xstrdup(cmdstr);
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/* "\anychar" -> "anychar" */
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parse_escapes(sed_cmd->string, sed_cmd->string, strlen(cmdstr), '\0', '\0');
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cmdstr += strlen(cmdstr);
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/* handle file cmds: (r)ead */
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} else if (strchr("rw", sed_cmd->cmd)) {
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if (sed_cmd->end_line || sed_cmd->end_match)
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bb_error_msg_and_die("command only uses one address");
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cmdstr += parse_file_cmd(/*sed_cmd,*/ cmdstr, &sed_cmd->string);
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if (sed_cmd->cmd == 'w') {
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sed_cmd->sw_file = xfopen_for_write(sed_cmd->string);
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sed_cmd->sw_last_char = '\n';
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}
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/* handle branch commands */
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} else if (strchr(":btT", sed_cmd->cmd)) {
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int length;
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cmdstr = skip_whitespace(cmdstr);
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length = strcspn(cmdstr, semicolon_whitespace);
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if (length) {
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sed_cmd->string = xstrndup(cmdstr, length);
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cmdstr += length;
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}
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}
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/* translation command */
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else if (sed_cmd->cmd == 'y') {
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char *match, *replace;
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int i = cmdstr[0];
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cmdstr += parse_regex_delim(cmdstr, &match, &replace)+1;
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/* \n already parsed, but \delimiter needs unescaping. */
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parse_escapes(match, match, strlen(match), i, i);
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parse_escapes(replace, replace, strlen(replace), i, i);
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sed_cmd->string = xzalloc((strlen(match) + 1) * 2);
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for (i = 0; match[i] && replace[i]; i++) {
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sed_cmd->string[i*2] = match[i];
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sed_cmd->string[i*2+1] = replace[i];
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}
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free(match);
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free(replace);
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}
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/* if it wasnt a single-letter command that takes no arguments
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* then it must be an invalid command.
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*/
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else if (strchr("dDgGhHlnNpPqx={}", sed_cmd->cmd) == 0) {
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bb_error_msg_and_die("unsupported command %c", sed_cmd->cmd);
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}
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/* give back whatever's left over */
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return cmdstr;
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}
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/* Parse address+command sets, skipping comment lines. */
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static void add_cmd(const char *cmdstr)
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{
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sed_cmd_t *sed_cmd;
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unsigned len, n;
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/* Append this line to any unfinished line from last time. */
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if (G.add_cmd_line) {
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char *tp = xasprintf("%s\n%s", G.add_cmd_line, cmdstr);
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free(G.add_cmd_line);
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cmdstr = G.add_cmd_line = tp;
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}
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/* If this line ends with unescaped backslash, request next line. */
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n = len = strlen(cmdstr);
|
|
while (n && cmdstr[n-1] == '\\')
|
|
n--;
|
|
if ((len - n) & 1) { /* if odd number of trailing backslashes */
|
|
if (!G.add_cmd_line)
|
|
G.add_cmd_line = xstrdup(cmdstr);
|
|
G.add_cmd_line[len-1] = '\0';
|
|
return;
|
|
}
|
|
|
|
/* Loop parsing all commands in this line. */
|
|
while (*cmdstr) {
|
|
/* Skip leading whitespace and semicolons */
|
|
cmdstr += strspn(cmdstr, semicolon_whitespace);
|
|
|
|
/* If no more commands, exit. */
|
|
if (!*cmdstr) break;
|
|
|
|
/* if this is a comment, jump past it and keep going */
|
|
if (*cmdstr == '#') {
|
|
/* "#n" is the same as using -n on the command line */
|
|
if (cmdstr[1] == 'n')
|
|
G.be_quiet++;
|
|
cmdstr = strpbrk(cmdstr, "\n\r");
|
|
if (!cmdstr) break;
|
|
continue;
|
|
}
|
|
|
|
/* parse the command
|
|
* format is: [addr][,addr][!]cmd
|
|
* |----||-----||-|
|
|
* part1 part2 part3
|
|
*/
|
|
|
|
sed_cmd = xzalloc(sizeof(sed_cmd_t));
|
|
|
|
/* first part (if present) is an address: either a '$', a number or a /regex/ */
|
|
cmdstr += get_address(cmdstr, &sed_cmd->beg_line, &sed_cmd->beg_match);
|
|
|
|
/* second part (if present) will begin with a comma */
|
|
if (*cmdstr == ',') {
|
|
int idx;
|
|
|
|
cmdstr++;
|
|
idx = get_address(cmdstr, &sed_cmd->end_line, &sed_cmd->end_match);
|
|
if (!idx)
|
|
bb_error_msg_and_die("no address after comma");
|
|
cmdstr += idx;
|
|
}
|
|
|
|
/* skip whitespace before the command */
|
|
cmdstr = skip_whitespace(cmdstr);
|
|
|
|
/* Check for inversion flag */
|
|
if (*cmdstr == '!') {
|
|
sed_cmd->invert = 1;
|
|
cmdstr++;
|
|
|
|
/* skip whitespace before the command */
|
|
cmdstr = skip_whitespace(cmdstr);
|
|
}
|
|
|
|
/* last part (mandatory) will be a command */
|
|
if (!*cmdstr)
|
|
bb_error_msg_and_die("missing command");
|
|
sed_cmd->cmd = *cmdstr++;
|
|
cmdstr = parse_cmd_args(sed_cmd, cmdstr);
|
|
|
|
/* Add the command to the command array */
|
|
G.sed_cmd_tail->next = sed_cmd;
|
|
G.sed_cmd_tail = G.sed_cmd_tail->next;
|
|
}
|
|
|
|
/* If we glued multiple lines together, free the memory. */
|
|
free(G.add_cmd_line);
|
|
G.add_cmd_line = NULL;
|
|
}
|
|
|
|
/* Append to a string, reallocating memory as necessary. */
|
|
|
|
#define PIPE_GROW 64
|
|
|
|
static void pipe_putc(char c)
|
|
{
|
|
if (G.pipeline.idx == G.pipeline.len) {
|
|
G.pipeline.buf = xrealloc(G.pipeline.buf,
|
|
G.pipeline.len + PIPE_GROW);
|
|
G.pipeline.len += PIPE_GROW;
|
|
}
|
|
G.pipeline.buf[G.pipeline.idx++] = c;
|
|
}
|
|
|
|
static void do_subst_w_backrefs(char *line, char *replace)
|
|
{
|
|
int i, j;
|
|
|
|
/* go through the replacement string */
|
|
for (i = 0; replace[i]; i++) {
|
|
/* if we find a backreference (\1, \2, etc.) print the backref'ed * text */
|
|
if (replace[i] == '\\') {
|
|
unsigned backref = replace[++i] - '0';
|
|
if (backref <= 9) {
|
|
/* print out the text held in G.regmatch[backref] */
|
|
if (G.regmatch[backref].rm_so != -1) {
|
|
j = G.regmatch[backref].rm_so;
|
|
while (j < G.regmatch[backref].rm_eo)
|
|
pipe_putc(line[j++]);
|
|
}
|
|
continue;
|
|
}
|
|
/* I _think_ it is impossible to get '\' to be
|
|
* the last char in replace string. Thus we dont check
|
|
* for replace[i] == NUL. (counterexample anyone?) */
|
|
/* if we find a backslash escaped character, print the character */
|
|
pipe_putc(replace[i]);
|
|
continue;
|
|
}
|
|
/* if we find an unescaped '&' print out the whole matched text. */
|
|
if (replace[i] == '&') {
|
|
j = G.regmatch[0].rm_so;
|
|
while (j < G.regmatch[0].rm_eo)
|
|
pipe_putc(line[j++]);
|
|
continue;
|
|
}
|
|
/* Otherwise just output the character. */
|
|
pipe_putc(replace[i]);
|
|
}
|
|
}
|
|
|
|
static int do_subst_command(sed_cmd_t *sed_cmd, char **line_p)
|
|
{
|
|
char *line = *line_p;
|
|
int altered = 0;
|
|
unsigned match_count = 0;
|
|
regex_t *current_regex;
|
|
|
|
current_regex = sed_cmd->sub_match;
|
|
/* Handle empty regex. */
|
|
if (!current_regex) {
|
|
current_regex = G.previous_regex_ptr;
|
|
if (!current_regex)
|
|
bb_error_msg_and_die("no previous regexp");
|
|
}
|
|
G.previous_regex_ptr = current_regex;
|
|
|
|
/* Find the first match */
|
|
if (REG_NOMATCH == regexec(current_regex, line, 10, G.regmatch, 0))
|
|
return 0;
|
|
|
|
/* Initialize temporary output buffer. */
|
|
G.pipeline.buf = xmalloc(PIPE_GROW);
|
|
G.pipeline.len = PIPE_GROW;
|
|
G.pipeline.idx = 0;
|
|
|
|
/* Now loop through, substituting for matches */
|
|
do {
|
|
int i;
|
|
|
|
/* Work around bug in glibc regexec, demonstrated by:
|
|
echo " a.b" | busybox sed 's [^ .]* x g'
|
|
The match_count check is so not to break
|
|
echo "hi" | busybox sed 's/^/!/g' */
|
|
if (!G.regmatch[0].rm_so && !G.regmatch[0].rm_eo && match_count) {
|
|
pipe_putc(*line++);
|
|
continue;
|
|
}
|
|
|
|
match_count++;
|
|
|
|
/* If we aren't interested in this match, output old line to
|
|
end of match and continue */
|
|
if (sed_cmd->which_match
|
|
&& (sed_cmd->which_match != match_count)
|
|
) {
|
|
for (i = 0; i < G.regmatch[0].rm_eo; i++)
|
|
pipe_putc(*line++);
|
|
continue;
|
|
}
|
|
|
|
/* print everything before the match */
|
|
for (i = 0; i < G.regmatch[0].rm_so; i++)
|
|
pipe_putc(line[i]);
|
|
|
|
/* then print the substitution string */
|
|
do_subst_w_backrefs(line, sed_cmd->string);
|
|
|
|
/* advance past the match */
|
|
line += G.regmatch[0].rm_eo;
|
|
/* flag that something has changed */
|
|
altered++;
|
|
|
|
/* if we're not doing this globally, get out now */
|
|
if (sed_cmd->which_match)
|
|
break;
|
|
|
|
//maybe (G.regmatch[0].rm_eo ? REG_NOTBOL : 0) instead of unconditional REG_NOTBOL?
|
|
} while (*line && regexec(current_regex, line, 10, G.regmatch, REG_NOTBOL) != REG_NOMATCH);
|
|
|
|
/* Copy rest of string into output pipeline */
|
|
while (1) {
|
|
char c = *line++;
|
|
pipe_putc(c);
|
|
if (c == '\0')
|
|
break;
|
|
}
|
|
|
|
free(*line_p);
|
|
*line_p = G.pipeline.buf;
|
|
return altered;
|
|
}
|
|
|
|
/* Set command pointer to point to this label. (Does not handle null label.) */
|
|
static sed_cmd_t *branch_to(char *label)
|
|
{
|
|
sed_cmd_t *sed_cmd;
|
|
|
|
for (sed_cmd = G.sed_cmd_head.next; sed_cmd; sed_cmd = sed_cmd->next) {
|
|
if (sed_cmd->cmd == ':' && sed_cmd->string && !strcmp(sed_cmd->string, label)) {
|
|
return sed_cmd;
|
|
}
|
|
}
|
|
bb_error_msg_and_die("can't find label for jump to '%s'", label);
|
|
}
|
|
|
|
static void append(char *s)
|
|
{
|
|
llist_add_to_end(&G.append_head, xstrdup(s));
|
|
}
|
|
|
|
static void flush_append(void)
|
|
{
|
|
char *data;
|
|
|
|
/* Output appended lines. */
|
|
while ((data = (char *)llist_pop(&G.append_head))) {
|
|
fprintf(G.nonstdout, "%s\n", data);
|
|
free(data);
|
|
}
|
|
}
|
|
|
|
static void add_input_file(FILE *file)
|
|
{
|
|
G.input_file_list = xrealloc_vector(G.input_file_list, 2, G.input_file_count);
|
|
G.input_file_list[G.input_file_count++] = file;
|
|
}
|
|
|
|
/* Get next line of input from G.input_file_list, flushing append buffer and
|
|
* noting if we ran out of files without a newline on the last line we read.
|
|
*/
|
|
enum {
|
|
NO_EOL_CHAR = 1,
|
|
LAST_IS_NUL = 2,
|
|
};
|
|
static char *get_next_line(char *gets_char)
|
|
{
|
|
char *temp = NULL;
|
|
int len;
|
|
char gc;
|
|
|
|
flush_append();
|
|
|
|
/* will be returned if last line in the file
|
|
* doesn't end with either '\n' or '\0' */
|
|
gc = NO_EOL_CHAR;
|
|
while (G.current_input_file < G.input_file_count) {
|
|
FILE *fp = G.input_file_list[G.current_input_file];
|
|
/* Read line up to a newline or NUL byte, inclusive,
|
|
* return malloc'ed char[]. length of the chunk read
|
|
* is stored in len. NULL if EOF/error */
|
|
temp = bb_get_chunk_from_file(fp, &len);
|
|
if (temp) {
|
|
/* len > 0 here, it's ok to do temp[len-1] */
|
|
char c = temp[len-1];
|
|
if (c == '\n' || c == '\0') {
|
|
temp[len-1] = '\0';
|
|
gc = c;
|
|
if (c == '\0') {
|
|
int ch = fgetc(fp);
|
|
if (ch != EOF)
|
|
ungetc(ch, fp);
|
|
else
|
|
gc = LAST_IS_NUL;
|
|
}
|
|
}
|
|
/* else we put NO_EOL_CHAR into *gets_char */
|
|
break;
|
|
|
|
/* NB: I had the idea of peeking next file(s) and returning
|
|
* NO_EOL_CHAR only if it is the *last* non-empty
|
|
* input file. But there is a case where this won't work:
|
|
* file1: "a woo\nb woo"
|
|
* file2: "c no\nd no"
|
|
* sed -ne 's/woo/bang/p' input1 input2 => "a bang\nb bang"
|
|
* (note: *no* newline after "b bang"!) */
|
|
}
|
|
/* Close this file and advance to next one */
|
|
fclose(fp);
|
|
G.current_input_file++;
|
|
}
|
|
*gets_char = gc;
|
|
return temp;
|
|
}
|
|
|
|
/* Output line of text. */
|
|
/* Note:
|
|
* The tricks with NO_EOL_CHAR and last_puts_char are there to emulate gnu sed.
|
|
* Without them, we had this:
|
|
* echo -n thingy >z1
|
|
* echo -n again >z2
|
|
* >znull
|
|
* sed "s/i/z/" z1 z2 znull | hexdump -vC
|
|
* output:
|
|
* gnu sed 4.1.5:
|
|
* 00000000 74 68 7a 6e 67 79 0a 61 67 61 7a 6e |thzngy.agazn|
|
|
* bbox:
|
|
* 00000000 74 68 7a 6e 67 79 61 67 61 7a 6e |thzngyagazn|
|
|
*/
|
|
static void puts_maybe_newline(char *s, FILE *file, char *last_puts_char, char last_gets_char)
|
|
{
|
|
char lpc = *last_puts_char;
|
|
|
|
/* Need to insert a '\n' between two files because first file's
|
|
* last line wasn't terminated? */
|
|
if (lpc != '\n' && lpc != '\0') {
|
|
fputc('\n', file);
|
|
lpc = '\n';
|
|
}
|
|
fputs(s, file);
|
|
|
|
/* 'x' - just something which is not '\n', '\0' or NO_EOL_CHAR */
|
|
if (s[0])
|
|
lpc = 'x';
|
|
|
|
/* had trailing '\0' and it was last char of file? */
|
|
if (last_gets_char == LAST_IS_NUL) {
|
|
fputc('\0', file);
|
|
lpc = 'x'; /* */
|
|
} else
|
|
/* had trailing '\n' or '\0'? */
|
|
if (last_gets_char != NO_EOL_CHAR) {
|
|
fputc(last_gets_char, file);
|
|
lpc = last_gets_char;
|
|
}
|
|
|
|
if (ferror(file)) {
|
|
xfunc_error_retval = 4; /* It's what gnu sed exits with... */
|
|
bb_error_msg_and_die(bb_msg_write_error);
|
|
}
|
|
*last_puts_char = lpc;
|
|
}
|
|
|
|
#define sed_puts(s, n) (puts_maybe_newline(s, G.nonstdout, &last_puts_char, n))
|
|
|
|
static int beg_match(sed_cmd_t *sed_cmd, const char *pattern_space)
|
|
{
|
|
int retval = sed_cmd->beg_match && !regexec(sed_cmd->beg_match, pattern_space, 0, NULL, 0);
|
|
if (retval)
|
|
G.previous_regex_ptr = sed_cmd->beg_match;
|
|
return retval;
|
|
}
|
|
|
|
/* Process all the lines in all the files */
|
|
|
|
static void process_files(void)
|
|
{
|
|
char *pattern_space, *next_line;
|
|
int linenum = 0;
|
|
char last_puts_char = '\n';
|
|
char last_gets_char, next_gets_char;
|
|
sed_cmd_t *sed_cmd;
|
|
int substituted;
|
|
|
|
/* Prime the pump */
|
|
next_line = get_next_line(&next_gets_char);
|
|
|
|
/* Go through every line in each file */
|
|
again:
|
|
substituted = 0;
|
|
|
|
/* Advance to next line. Stop if out of lines. */
|
|
pattern_space = next_line;
|
|
if (!pattern_space)
|
|
return;
|
|
last_gets_char = next_gets_char;
|
|
|
|
/* Read one line in advance so we can act on the last line,
|
|
* the '$' address */
|
|
next_line = get_next_line(&next_gets_char);
|
|
linenum++;
|
|
|
|
/* For every line, go through all the commands */
|
|
restart:
|
|
for (sed_cmd = G.sed_cmd_head.next; sed_cmd; sed_cmd = sed_cmd->next) {
|
|
int old_matched, matched;
|
|
|
|
old_matched = sed_cmd->in_match;
|
|
|
|
/* Determine if this command matches this line: */
|
|
|
|
//bb_error_msg("match1:%d", sed_cmd->in_match);
|
|
//bb_error_msg("match2:%d", (!sed_cmd->beg_line && !sed_cmd->end_line
|
|
// && !sed_cmd->beg_match && !sed_cmd->end_match));
|
|
//bb_error_msg("match3:%d", (sed_cmd->beg_line > 0
|
|
// && (sed_cmd->end_line || sed_cmd->end_match
|
|
// ? (sed_cmd->beg_line <= linenum)
|
|
// : (sed_cmd->beg_line == linenum)
|
|
// )
|
|
// )
|
|
//bb_error_msg("match4:%d", (beg_match(sed_cmd, pattern_space)));
|
|
//bb_error_msg("match5:%d", (sed_cmd->beg_line == -1 && next_line == NULL));
|
|
|
|
/* Are we continuing a previous multi-line match? */
|
|
sed_cmd->in_match = sed_cmd->in_match
|
|
/* Or is no range necessary? */
|
|
|| (!sed_cmd->beg_line && !sed_cmd->end_line
|
|
&& !sed_cmd->beg_match && !sed_cmd->end_match)
|
|
/* Or did we match the start of a numerical range? */
|
|
|| (sed_cmd->beg_line > 0
|
|
&& (sed_cmd->end_line || sed_cmd->end_match
|
|
/* note: even if end is numeric and is < linenum too,
|
|
* GNU sed matches! We match too */
|
|
? (sed_cmd->beg_line <= linenum) /* N,end */
|
|
: (sed_cmd->beg_line == linenum) /* N */
|
|
)
|
|
)
|
|
/* Or does this line match our begin address regex? */
|
|
|| (beg_match(sed_cmd, pattern_space))
|
|
/* Or did we match last line of input? */
|
|
|| (sed_cmd->beg_line == -1 && next_line == NULL);
|
|
|
|
/* Snapshot the value */
|
|
matched = sed_cmd->in_match;
|
|
|
|
//bb_error_msg("cmd:'%c' matched:%d beg_line:%d end_line:%d linenum:%d",
|
|
//sed_cmd->cmd, matched, sed_cmd->beg_line, sed_cmd->end_line, linenum);
|
|
|
|
/* Is this line the end of the current match? */
|
|
|
|
if (matched) {
|
|
/* once matched, "n,xxx" range is dead, disabling it */
|
|
if (sed_cmd->beg_line > 0
|
|
&& !(option_mask32 & OPT_in_place) /* but not for -i */
|
|
) {
|
|
sed_cmd->beg_line = -2;
|
|
}
|
|
sed_cmd->in_match = !(
|
|
/* has the ending line come, or is this a single address command? */
|
|
(sed_cmd->end_line ?
|
|
sed_cmd->end_line == -1 ?
|
|
!next_line
|
|
: (sed_cmd->end_line <= linenum)
|
|
: !sed_cmd->end_match
|
|
)
|
|
/* or does this line matches our last address regex */
|
|
|| (sed_cmd->end_match && old_matched
|
|
&& (regexec(sed_cmd->end_match,
|
|
pattern_space, 0, NULL, 0) == 0))
|
|
);
|
|
}
|
|
|
|
/* Skip blocks of commands we didn't match */
|
|
if (sed_cmd->cmd == '{') {
|
|
if (sed_cmd->invert ? matched : !matched) {
|
|
unsigned nest_cnt = 0;
|
|
while (1) {
|
|
if (sed_cmd->cmd == '{')
|
|
nest_cnt++;
|
|
if (sed_cmd->cmd == '}') {
|
|
nest_cnt--;
|
|
if (nest_cnt == 0)
|
|
break;
|
|
}
|
|
sed_cmd = sed_cmd->next;
|
|
if (!sed_cmd)
|
|
bb_error_msg_and_die("unterminated {");
|
|
}
|
|
}
|
|
continue;
|
|
}
|
|
|
|
/* Okay, so did this line match? */
|
|
if (sed_cmd->invert ? matched : !matched)
|
|
continue; /* no */
|
|
|
|
/* Update last used regex in case a blank substitute BRE is found */
|
|
if (sed_cmd->beg_match) {
|
|
G.previous_regex_ptr = sed_cmd->beg_match;
|
|
}
|
|
|
|
/* actual sedding */
|
|
switch (sed_cmd->cmd) {
|
|
|
|
/* Print line number */
|
|
case '=':
|
|
fprintf(G.nonstdout, "%d\n", linenum);
|
|
break;
|
|
|
|
/* Write the current pattern space up to the first newline */
|
|
case 'P':
|
|
{
|
|
char *tmp = strchr(pattern_space, '\n');
|
|
if (tmp) {
|
|
*tmp = '\0';
|
|
/* TODO: explain why '\n' below */
|
|
sed_puts(pattern_space, '\n');
|
|
*tmp = '\n';
|
|
break;
|
|
}
|
|
/* Fall Through */
|
|
}
|
|
|
|
/* Write the current pattern space to output */
|
|
case 'p':
|
|
/* NB: we print this _before_ the last line
|
|
* (of current file) is printed. Even if
|
|
* that line is nonterminated, we print
|
|
* '\n' here (gnu sed does the same) */
|
|
sed_puts(pattern_space, '\n');
|
|
break;
|
|
/* Delete up through first newline */
|
|
case 'D':
|
|
{
|
|
char *tmp = strchr(pattern_space, '\n');
|
|
if (tmp) {
|
|
overlapping_strcpy(pattern_space, tmp + 1);
|
|
goto restart;
|
|
}
|
|
}
|
|
/* discard this line. */
|
|
case 'd':
|
|
goto discard_line;
|
|
|
|
/* Substitute with regex */
|
|
case 's':
|
|
if (!do_subst_command(sed_cmd, &pattern_space))
|
|
break;
|
|
substituted |= 1;
|
|
|
|
/* handle p option */
|
|
if (sed_cmd->sub_p)
|
|
sed_puts(pattern_space, last_gets_char);
|
|
/* handle w option */
|
|
if (sed_cmd->sw_file)
|
|
puts_maybe_newline(
|
|
pattern_space, sed_cmd->sw_file,
|
|
&sed_cmd->sw_last_char, last_gets_char);
|
|
break;
|
|
|
|
/* Append line to linked list to be printed later */
|
|
case 'a':
|
|
append(sed_cmd->string);
|
|
break;
|
|
|
|
/* Insert text before this line */
|
|
case 'i':
|
|
sed_puts(sed_cmd->string, '\n');
|
|
break;
|
|
|
|
/* Cut and paste text (replace) */
|
|
case 'c':
|
|
/* Only triggers on last line of a matching range. */
|
|
if (!sed_cmd->in_match)
|
|
sed_puts(sed_cmd->string, '\n');
|
|
goto discard_line;
|
|
|
|
/* Read file, append contents to output */
|
|
case 'r':
|
|
{
|
|
FILE *rfile;
|
|
rfile = fopen_for_read(sed_cmd->string);
|
|
if (rfile) {
|
|
char *line;
|
|
|
|
while ((line = xmalloc_fgetline(rfile))
|
|
!= NULL)
|
|
append(line);
|
|
xprint_and_close_file(rfile);
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
/* Write pattern space to file. */
|
|
case 'w':
|
|
puts_maybe_newline(
|
|
pattern_space, sed_cmd->sw_file,
|
|
&sed_cmd->sw_last_char, last_gets_char);
|
|
break;
|
|
|
|
/* Read next line from input */
|
|
case 'n':
|
|
if (!G.be_quiet)
|
|
sed_puts(pattern_space, last_gets_char);
|
|
if (next_line) {
|
|
free(pattern_space);
|
|
pattern_space = next_line;
|
|
last_gets_char = next_gets_char;
|
|
next_line = get_next_line(&next_gets_char);
|
|
substituted = 0;
|
|
linenum++;
|
|
break;
|
|
}
|
|
/* fall through */
|
|
|
|
/* Quit. End of script, end of input. */
|
|
case 'q':
|
|
/* Exit the outer while loop */
|
|
free(next_line);
|
|
next_line = NULL;
|
|
goto discard_commands;
|
|
|
|
/* Append the next line to the current line */
|
|
case 'N':
|
|
{
|
|
int len;
|
|
/* If no next line, jump to end of script and exit. */
|
|
if (next_line == NULL) {
|
|
free(next_line);
|
|
next_line = NULL;
|
|
goto discard_line;
|
|
}
|
|
/* Append next_line, read new next_line. */
|
|
len = strlen(pattern_space);
|
|
pattern_space = xrealloc(pattern_space, len + strlen(next_line) + 2);
|
|
pattern_space[len] = '\n';
|
|
strcpy(pattern_space + len+1, next_line);
|
|
last_gets_char = next_gets_char;
|
|
next_line = get_next_line(&next_gets_char);
|
|
linenum++;
|
|
break;
|
|
}
|
|
|
|
/* Test/branch if substitution occurred */
|
|
case 't':
|
|
if (!substituted) break;
|
|
substituted = 0;
|
|
/* Fall through */
|
|
/* Test/branch if substitution didn't occur */
|
|
case 'T':
|
|
if (substituted) break;
|
|
/* Fall through */
|
|
/* Branch to label */
|
|
case 'b':
|
|
if (!sed_cmd->string) goto discard_commands;
|
|
else sed_cmd = branch_to(sed_cmd->string);
|
|
break;
|
|
/* Transliterate characters */
|
|
case 'y':
|
|
{
|
|
int i, j;
|
|
for (i = 0; pattern_space[i]; i++) {
|
|
for (j = 0; sed_cmd->string[j]; j += 2) {
|
|
if (pattern_space[i] == sed_cmd->string[j]) {
|
|
pattern_space[i] = sed_cmd->string[j + 1];
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
break;
|
|
}
|
|
case 'g': /* Replace pattern space with hold space */
|
|
free(pattern_space);
|
|
pattern_space = xstrdup(G.hold_space ? G.hold_space : "");
|
|
break;
|
|
case 'G': /* Append newline and hold space to pattern space */
|
|
{
|
|
int pattern_space_size = 2;
|
|
int hold_space_size = 0;
|
|
|
|
if (pattern_space)
|
|
pattern_space_size += strlen(pattern_space);
|
|
if (G.hold_space)
|
|
hold_space_size = strlen(G.hold_space);
|
|
pattern_space = xrealloc(pattern_space,
|
|
pattern_space_size + hold_space_size);
|
|
if (pattern_space_size == 2)
|
|
pattern_space[0] = 0;
|
|
strcat(pattern_space, "\n");
|
|
if (G.hold_space)
|
|
strcat(pattern_space, G.hold_space);
|
|
last_gets_char = '\n';
|
|
|
|
break;
|
|
}
|
|
case 'h': /* Replace hold space with pattern space */
|
|
free(G.hold_space);
|
|
G.hold_space = xstrdup(pattern_space);
|
|
break;
|
|
case 'H': /* Append newline and pattern space to hold space */
|
|
{
|
|
int hold_space_size = 2;
|
|
int pattern_space_size = 0;
|
|
|
|
if (G.hold_space)
|
|
hold_space_size += strlen(G.hold_space);
|
|
if (pattern_space)
|
|
pattern_space_size = strlen(pattern_space);
|
|
G.hold_space = xrealloc(G.hold_space,
|
|
hold_space_size + pattern_space_size);
|
|
|
|
if (hold_space_size == 2)
|
|
*G.hold_space = 0;
|
|
strcat(G.hold_space, "\n");
|
|
if (pattern_space)
|
|
strcat(G.hold_space, pattern_space);
|
|
|
|
break;
|
|
}
|
|
case 'x': /* Exchange hold and pattern space */
|
|
{
|
|
char *tmp = pattern_space;
|
|
pattern_space = G.hold_space ? G.hold_space : xzalloc(1);
|
|
last_gets_char = '\n';
|
|
G.hold_space = tmp;
|
|
break;
|
|
}
|
|
} /* switch */
|
|
} /* for each cmd */
|
|
|
|
/*
|
|
* Exit point from sedding...
|
|
*/
|
|
discard_commands:
|
|
/* we will print the line unless we were told to be quiet ('-n')
|
|
or if the line was suppressed (ala 'd'elete) */
|
|
if (!G.be_quiet)
|
|
sed_puts(pattern_space, last_gets_char);
|
|
|
|
/* Delete and such jump here. */
|
|
discard_line:
|
|
flush_append();
|
|
free(pattern_space);
|
|
|
|
goto again;
|
|
}
|
|
|
|
/* It is possible to have a command line argument with embedded
|
|
* newlines. This counts as multiple command lines.
|
|
* However, newline can be escaped: 's/e/z\<newline>z/'
|
|
* We check for this.
|
|
*/
|
|
|
|
static void add_cmd_block(char *cmdstr)
|
|
{
|
|
char *sv, *eol;
|
|
|
|
cmdstr = sv = xstrdup(cmdstr);
|
|
do {
|
|
eol = strchr(cmdstr, '\n');
|
|
next:
|
|
if (eol) {
|
|
/* Count preceding slashes */
|
|
int slashes = 0;
|
|
char *sl = eol;
|
|
|
|
while (sl != cmdstr && *--sl == '\\')
|
|
slashes++;
|
|
/* Odd number of preceding slashes - newline is escaped */
|
|
if (slashes & 1) {
|
|
overlapping_strcpy(eol - 1, eol);
|
|
eol = strchr(eol, '\n');
|
|
goto next;
|
|
}
|
|
*eol = '\0';
|
|
}
|
|
add_cmd(cmdstr);
|
|
cmdstr = eol + 1;
|
|
} while (eol);
|
|
free(sv);
|
|
}
|
|
|
|
int sed_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int sed_main(int argc UNUSED_PARAM, char **argv)
|
|
{
|
|
unsigned opt;
|
|
llist_t *opt_e, *opt_f;
|
|
int status = EXIT_SUCCESS;
|
|
|
|
INIT_G();
|
|
|
|
/* destroy command strings on exit */
|
|
if (ENABLE_FEATURE_CLEAN_UP) atexit(sed_free_and_close_stuff);
|
|
|
|
/* Lie to autoconf when it starts asking stupid questions. */
|
|
if (argv[1] && !strcmp(argv[1], "--version")) {
|
|
puts("This is not GNU sed version 4.0");
|
|
return 0;
|
|
}
|
|
|
|
/* do normal option parsing */
|
|
opt_e = opt_f = NULL;
|
|
opt_complementary = "e::f::" /* can occur multiple times */
|
|
"nn"; /* count -n */
|
|
/* -i must be first, to match OPT_in_place definition */
|
|
opt = getopt32(argv, "irne:f:", &opt_e, &opt_f,
|
|
&G.be_quiet); /* counter for -n */
|
|
//argc -= optind;
|
|
argv += optind;
|
|
if (opt & OPT_in_place) { // -i
|
|
atexit(cleanup_outname);
|
|
}
|
|
if (opt & 0x2) G.regex_type |= REG_EXTENDED; // -r
|
|
//if (opt & 0x4) G.be_quiet++; // -n
|
|
while (opt_e) { // -e
|
|
add_cmd_block(llist_pop(&opt_e));
|
|
}
|
|
while (opt_f) { // -f
|
|
char *line;
|
|
FILE *cmdfile;
|
|
cmdfile = xfopen_for_read(llist_pop(&opt_f));
|
|
while ((line = xmalloc_fgetline(cmdfile)) != NULL) {
|
|
add_cmd(line);
|
|
free(line);
|
|
}
|
|
fclose(cmdfile);
|
|
}
|
|
/* if we didn't get a pattern from -e or -f, use argv[0] */
|
|
if (!(opt & 0x18)) {
|
|
if (!*argv)
|
|
bb_show_usage();
|
|
add_cmd_block(*argv++);
|
|
}
|
|
/* Flush any unfinished commands. */
|
|
add_cmd("");
|
|
|
|
/* By default, we write to stdout */
|
|
G.nonstdout = stdout;
|
|
|
|
/* argv[0..(argc-1)] should be names of file to process. If no
|
|
* files were specified or '-' was specified, take input from stdin.
|
|
* Otherwise, we process all the files specified. */
|
|
if (argv[0] == NULL) {
|
|
if (opt & OPT_in_place)
|
|
bb_error_msg_and_die(bb_msg_requires_arg, "-i");
|
|
add_input_file(stdin);
|
|
} else {
|
|
int i;
|
|
FILE *file;
|
|
|
|
for (i = 0; argv[i]; i++) {
|
|
struct stat statbuf;
|
|
int nonstdoutfd;
|
|
|
|
if (LONE_DASH(argv[i]) && !(opt & OPT_in_place)) {
|
|
add_input_file(stdin);
|
|
process_files();
|
|
continue;
|
|
}
|
|
file = fopen_or_warn(argv[i], "r");
|
|
if (!file) {
|
|
status = EXIT_FAILURE;
|
|
continue;
|
|
}
|
|
if (!(opt & OPT_in_place)) {
|
|
add_input_file(file);
|
|
continue;
|
|
}
|
|
|
|
G.outname = xasprintf("%sXXXXXX", argv[i]);
|
|
nonstdoutfd = mkstemp(G.outname);
|
|
if (-1 == nonstdoutfd)
|
|
bb_perror_msg_and_die("can't create temp file %s", G.outname);
|
|
G.nonstdout = xfdopen_for_write(nonstdoutfd);
|
|
|
|
/* Set permissions/owner of output file */
|
|
fstat(fileno(file), &statbuf);
|
|
/* chmod'ing AFTER chown would preserve suid/sgid bits,
|
|
* but GNU sed 4.2.1 does not preserve them either */
|
|
fchmod(nonstdoutfd, statbuf.st_mode);
|
|
fchown(nonstdoutfd, statbuf.st_uid, statbuf.st_gid);
|
|
add_input_file(file);
|
|
process_files();
|
|
fclose(G.nonstdout);
|
|
|
|
G.nonstdout = stdout;
|
|
/* unlink(argv[i]); */
|
|
xrename(G.outname, argv[i]);
|
|
free(G.outname);
|
|
G.outname = NULL;
|
|
}
|
|
/* Here, to handle "sed 'cmds' nonexistent_file" case we did:
|
|
* if (G.current_input_file >= G.input_file_count)
|
|
* return status;
|
|
* but it's not needed since process_files() works correctly
|
|
* in this case too. */
|
|
}
|
|
process_files();
|
|
|
|
return status;
|
|
}
|