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Glenn L McGrath 2003-04-09 01:43:54 +00:00
parent 8d6395d41a
commit bd9b32bc0d
1 changed files with 37 additions and 36 deletions
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73
editors/sed.c
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@ -4,6 +4,7 @@
* 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@optushome.com.au>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -31,6 +32,9 @@
- file commands: (r)ead
- backreferences in substitution expressions (\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)
(Note: Specifying an address (range) to match is *optional*; commands
default to the whole pattern space if no specific address match was
@ -38,11 +42,13 @@
Unsupported features:
- transliteration (y/source-chars/dest-chars/) (use 'tr')
- no pattern space hold space storing / swapping (x, etc.)
- no labels / branching (: label, b, t, and friends)
- GNU extensions
- and lots, lots more.
Bugs:
- Cant subst globally using ^ or $ in regex, eg. "aah" | sed 's/^a/b/g'
Reference http://www.opengroup.org/onlinepubs/007904975/utilities/sed.html
*/
@ -55,19 +61,6 @@
#include <stdlib.h>
#include "busybox.h"
/* the spec says label must be at least 8 chars, behavious is unspecified if more than 8 chars */
#define SED_LABEL_LENGTH 8
/* externs */
extern void xregcomp(regex_t * preg, const char *regex, int cflags);
extern int optind; /* in unistd.h */
extern char *optarg; /* ditto */
/* options */
static int be_quiet = 0;
static const char bad_format_in_subst[] =
"bad format in substitution expression";
typedef struct sed_cmd_s {
/* Order by alignment requirements */
@ -109,14 +102,25 @@ typedef struct sed_cmd_s {
int invert; /* the '!' after the address */
/* Branch commands */
char label[SED_LABEL_LENGTH + 1];
char *label;
/* next command in list (sequential list of specified commands) */
struct sed_cmd_s *linear;
struct sed_cmd_s *next;
} sed_cmd_t;
/* externs */
extern void xregcomp(regex_t * preg, const char *regex, int cflags);
extern int optind; /* in unistd.h */
extern char *optarg; /* ditto */
/* globals */
/* options */
static int be_quiet = 0;
static const char bad_format_in_subst[] =
"bad format in substitution expression";
/* linked list of sed commands */
static sed_cmd_t sed_cmd_head;
static sed_cmd_t *sed_cmd_tail = &sed_cmd_head;
@ -126,13 +130,14 @@ static int in_block = 0;
const char *const semicolon_whitespace = "; \n\r\t\v\0";
static regex_t *previous_regex_ptr = NULL;
#ifdef CONFIG_FEATURE_CLEAN_UP
static void destroy_cmd_strs(void)
{
sed_cmd_t *sed_cmd = sed_cmd_head.linear;
sed_cmd_t *sed_cmd = sed_cmd_head.next;
while (sed_cmd) {
sed_cmd_t *sed_cmd_next = sed_cmd->linear;
sed_cmd_t *sed_cmd_next = sed_cmd->next;
if (sed_cmd->beg_match) {
regfree(sed_cmd->beg_match);
@ -445,7 +450,7 @@ static int parse_file_cmd(sed_cmd_t * sed_cmd, const char *filecmdstr)
/*
* Process the commands arguments
*/
static char *parse_cmd_str(sed_cmd_t * const sed_cmd, char *cmdstr)
static char *parse_cmd_str(sed_cmd_t *sed_cmd, char *cmdstr)
{
/* handle (s)ubstitution command */
if (sed_cmd->cmd == 's') {
@ -469,11 +474,8 @@ static char *parse_cmd_str(sed_cmd_t * const sed_cmd, char *cmdstr)
int length;
cmdstr += strspn(cmdstr, " ");
length = strcspn(cmdstr, "; ");
if (length > SED_LABEL_LENGTH) {
length = SED_LABEL_LENGTH;
}
strncpy(sed_cmd->label, cmdstr, length);
length = strcspn(cmdstr, "; \n");
sed_cmd->label = strndup(cmdstr, length);
cmdstr += length;
}
/* translation command */
@ -595,8 +597,8 @@ static char *add_cmd(sed_cmd_t * sed_cmd, char *cmdstr)
cmdstr = parse_cmd_str(sed_cmd, cmdstr);
/* Add the command to the command array */
sed_cmd_tail->linear = sed_cmd;
sed_cmd_tail = sed_cmd_tail->linear;
sed_cmd_tail->next = sed_cmd;
sed_cmd_tail = sed_cmd_tail->next;
return (cmdstr);
}
@ -805,9 +807,8 @@ static int do_subst_command(sed_cmd_t * sed_cmd, char **line)
static sed_cmd_t *branch_to(const char *label)
{
sed_cmd_t *sed_cmd;
for (sed_cmd = sed_cmd_head.linear; sed_cmd; sed_cmd = sed_cmd->linear) {
if (strcmp(sed_cmd->label, label) == 0) {
for (sed_cmd = sed_cmd_head.next; sed_cmd; sed_cmd = sed_cmd->next) {
if ((sed_cmd->label) && (strcmp(sed_cmd->label, label) == 0)) {
break;
}
}
@ -844,8 +845,8 @@ static void process_file(FILE * file)
force_print = 0;
/* for every line, go through all the commands */
for (sed_cmd = sed_cmd_head.linear; sed_cmd;
sed_cmd = sed_cmd->linear) {
for (sed_cmd = sed_cmd_head.next; sed_cmd;
sed_cmd = sed_cmd->next) {
int deleted = 0;
/*
@ -952,8 +953,8 @@ static void process_file(FILE * file)
}
#endif
altered |= substituted;
if (!be_quiet && altered && ((sed_cmd->linear == NULL)
|| (sed_cmd->linear->cmd !=
if (!be_quiet && altered && ((sed_cmd->next == NULL)
|| (sed_cmd->next->cmd !=
's'))) {
force_print = 1;
}
@ -1160,7 +1161,7 @@ extern int sed_main(int argc, char **argv)
/* if we didn't get a pattern from a -e and no command file was specified,
* argv[optind] should be the pattern. no pattern, no worky */
if (sed_cmd_head.linear == NULL) {
if (sed_cmd_head.next == NULL) {
if (argv[optind] == NULL)
bb_show_usage();
else {