+/* 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@optushome.com.au>
+ * Copyright (C) 2003 by Glenn McGrath
+ * Copyright (C) 2003,2004 by Rob Landley <rob@landley.net>
*
- * 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
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * 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:
- 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 (\1, \2...\9)
+ - 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)
+ - 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.)
- Unsupported features:
-
- - GNU extensions
- - and more.
-
- Bugs:
-
- - lots
+ Todo:
+ - Create a wrapper around regex to make libc's regex conform with sed
Reference http://www.opengroup.org/onlinepubs/007904975/utilities/sed.html
*/
-#include <stdio.h>
-#include <unistd.h> /* for getopt() */
-#include <regex.h>
-#include <string.h> /* for strdup() */
-#include <errno.h>
-#include <ctype.h> /* for isspace() */
-#include <stdlib.h>
-#include "busybox.h"
+#include "libbb.h"
+#include "xregex.h"
+/* Each sed command turns into one of these structures. */
typedef struct sed_cmd_s {
- /* Order by alignment requirements */
+ /* Ordered by alignment requirements: currently 36 bytes on x86 */
+ struct sed_cmd_s *next; /* Next command (linked list, NULL terminated) */
/* address storage */
- regex_t *beg_match; /* sed -e '/match/cmd' */
- regex_t *end_match; /* sed -e '/match/,/end_match/cmd' */
-
- int beg_line; /* 'sed 1p' 0 == no begining line, apply commands to all lines */
- int end_line; /* 'sed 1,3p' 0 == no end line, use only beginning. -1 == $ */
-
- /* inversion flag */
- int invert; /* the '!' after the address */
-
- /* Runtime flag no not if the current command match's */
- int still_in_range;
-
- /* SUBSTITUTION COMMAND SPECIFIC FIELDS */
+ regex_t *beg_match; /* sed -e '/match/cmd' */
+ regex_t *end_match; /* sed -e '/match/,/end_match/cmd' */
+ regex_t *sub_match; /* For 's/sub_match/string/' */
+ int beg_line; /* 'sed 1p' 0 == apply commands to all lines */
+ int end_line; /* 'sed 1,3p' 0 == one line only. -1 = last line ($) */
- /* sed -e 's/sub_match/replace/' */
- regex_t *sub_match;
- char *replace;
+ FILE *sw_file; /* File (sw) command writes to, -1 for none. */
+ char *string; /* Data string for (saicytb) commands. */
- /* EDIT COMMAND (a,i,c) SPECIFIC FIELDS */
- char *editline;
+ unsigned which_match; /* (s) Which match to replace (0 for all) */
- /* FILE COMMAND (r) SPECIFIC FIELDS */
- char *filename;
+ /* Bitfields (gcc won't group them if we don't) */
+ unsigned invert:1; /* the '!' after the address */
+ unsigned in_match:1; /* Next line also included in match? */
+ unsigned sub_p:1; /* (s) print option */
- /* SUBSTITUTION COMMAND SPECIFIC FIELDS */
-
- unsigned int num_backrefs:4; /* how many back references (\1..\9) */
- /* Note: GNU/POSIX sed does not save more than nine backrefs, so
- * we only use 4 bits to hold the number */
- unsigned int sub_g:1; /* sed -e 's/foo/bar/g' (global) */
- unsigned int sub_p:1; /* sed -e 's/foo/bar/p' (print substitution) */
-
- /* TRANSLATE COMMAND */
- char *translate;
+ char sw_last_char; /* Last line written by (sw) had no '\n' */
/* GENERAL FIELDS */
- /* the command */
- char cmd; /* p,d,s (add more at your leisure :-) */
+ char cmd; /* The command char: abcdDgGhHilnNpPqrstwxy:={} */
+} sed_cmd_t;
- /* Branch commands */
- char *label;
+static const char semicolon_whitespace[] ALIGN1 = "; \n\r\t\v";
- /* next command in list (sequential list of specified commands) */
- struct sed_cmd_s *next;
+struct globals {
+ /* options */
+ int be_quiet, regex_type;
+ FILE *nonstdout;
+ char *outname, *hold_space;
-} sed_cmd_t;
+ /* List of input files */
+ int input_file_count, current_input_file;
+ FILE **input_file_list;
+ regmatch_t regmatch[10];
+ regex_t *previous_regex_ptr;
-/* externs */
-extern void xregcomp(regex_t * preg, const char *regex, int cflags);
-extern int optind; /* in unistd.h */
-extern char *optarg; /* ditto */
+ /* linked list of sed commands */
+ sed_cmd_t sed_cmd_head, *sed_cmd_tail;
-/* globals */
-/* options */
-static int be_quiet = 0;
-static const char bad_format_in_subst[] =
- "bad format in substitution expression";
+ /* Linked list of append lines */
+ llist_t *append_head;
-/* linked list of sed commands */
-static sed_cmd_t sed_cmd_head;
-static sed_cmd_t *sed_cmd_tail = &sed_cmd_head;
+ char *add_cmd_line;
-const char *const semicolon_whitespace = "; \n\r\t\v\0";
-static regex_t *previous_regex_ptr = NULL;
+ struct pipeline {
+ char *buf; /* Space to hold string */
+ int idx; /* Space used */
+ int len; /* Space allocated */
+ } pipeline;
+};
+#define G (*(struct globals*)&bb_common_bufsiz1)
+void BUG_sed_globals_too_big(void);
+#define INIT_G() do { \
+ if (sizeof(struct globals) > COMMON_BUFSIZE) \
+ BUG_sed_globals_too_big(); \
+ G.sed_cmd_tail = &G.sed_cmd_head; \
+} while (0)
-#ifdef CONFIG_FEATURE_CLEAN_UP
-static void destroy_cmd_strs(void)
+#if ENABLE_FEATURE_CLEAN_UP
+static void sed_free_and_close_stuff(void)
{
- sed_cmd_t *sed_cmd = sed_cmd_head.next;
+ sed_cmd_t *sed_cmd = G.sed_cmd_head.next;
+
+ llist_free(G.append_head, free);
while (sed_cmd) {
sed_cmd_t *sed_cmd_next = sed_cmd->next;
+ if (sed_cmd->sw_file)
+ xprint_and_close_file(sed_cmd->sw_file);
+
if (sed_cmd->beg_match) {
regfree(sed_cmd->beg_match);
free(sed_cmd->beg_match);
regfree(sed_cmd->sub_match);
free(sed_cmd->sub_match);
}
- free(sed_cmd->replace);
- free(sed_cmd->editline);
- free(sed_cmd->filename);
- free(sed_cmd->translate);
- free(sed_cmd->label);
+ free(sed_cmd->string);
free(sed_cmd);
sed_cmd = sed_cmd_next;
}
+
+ free(G.hold_space);
+
+ while (G.current_input_file < G.input_file_count)
+ fclose(G.input_file_list[G.current_input_file++]);
}
+#else
+void sed_free_and_close_stuff(void);
#endif
+/* If something bad happens during -i operation, delete temp file */
+
+static void cleanup_outname(void)
+{
+ if (G.outname) unlink(G.outname);
+}
+
+/* strcpy, replacing "\from" with 'to'. If to is NUL, replacing "\any" with 'any' */
+
+static void parse_escapes(char *dest, const char *string, int len, char from, char to)
+{
+ int i = 0;
+
+ while (i < len) {
+ if (string[i] == '\\') {
+ if (!to || string[i+1] == from) {
+ *dest++ = to ? to : string[i+1];
+ i += 2;
+ continue;
+ }
+ *dest++ = string[i++];
+ }
+ /* TODO: is it safe wrt a string with trailing '\\' ? */
+ *dest++ = string[i++];
+ }
+ *dest = '\0';
+}
+
+static char *copy_parsing_escapes(const char *string, int len)
+{
+ char *dest = xmalloc(len + 1);
+
+ parse_escapes(dest, string, len, 'n', '\n');
+ /* GNU sed also recognizes \t */
+ parse_escapes(dest, dest, strlen(dest), 't', '\t');
+ return dest;
+}
+
+
/*
* index_of_next_unescaped_regexp_delim - walks left to right through a string
* beginning at a specified index and returns the index of the next regular
- * expression delimiter (typically a forward * slash ('/')) not preceeded by
- * a backslash ('\').
+ * expression delimiter (typically a forward slash ('/')) not preceded by
+ * a backslash ('\'). A negative delimiter disables square bracket checking.
*/
-static int index_of_next_unescaped_regexp_delim(const char delimiter,
- const char *str)
+static int index_of_next_unescaped_regexp_delim(int delimiter, const char *str)
{
int bracket = -1;
int escaped = 0;
int idx = 0;
char ch;
+ if (delimiter < 0) {
+ bracket--;
+ delimiter = -delimiter;
+ }
+
for (; (ch = str[idx]); idx++) {
- if (bracket != -1) {
+ if (bracket >= 0) {
if (ch == ']' && !(bracket == idx - 1 || (bracket == idx - 2
- && str[idx - 1] == '^')))
+ && str[idx - 1] == '^')))
bracket = -1;
} else if (escaped)
escaped = 0;
else if (ch == '\\')
escaped = 1;
- else if (ch == '[')
+ else if (bracket == -1 && ch == '[')
bracket = idx;
else if (ch == delimiter)
return idx;
}
/* if we make it to here, we've hit the end of the string */
- return -1;
+ bb_error_msg_and_die("unmatched '%c'", delimiter);
}
/*
/* verify that the 's' or 'y' is followed by something. That something
* (typically a 'slash') is now our regexp delimiter... */
if (*cmdstr == '\0')
- bb_error_msg_and_die(bad_format_in_subst);
- else
- delimiter = *cmdstr_ptr;
-
- cmdstr_ptr++;
+ bb_error_msg_and_die("bad format in substitution expression");
+ delimiter = *cmdstr_ptr++;
/* save the match string */
idx = index_of_next_unescaped_regexp_delim(delimiter, cmdstr_ptr);
- if (idx == -1) {
- bb_error_msg_and_die(bad_format_in_subst);
- }
- *match = bb_xstrndup(cmdstr_ptr, idx);
+ *match = copy_parsing_escapes(cmdstr_ptr, idx);
/* save the replacement string */
cmdstr_ptr += idx + 1;
- idx = index_of_next_unescaped_regexp_delim(delimiter, cmdstr_ptr);
- if (idx == -1) {
- bb_error_msg_and_die(bad_format_in_subst);
- }
- *replace = bb_xstrndup(cmdstr_ptr, idx);
+ idx = index_of_next_unescaped_regexp_delim(-delimiter, cmdstr_ptr);
+ *replace = copy_parsing_escapes(cmdstr_ptr, idx);
return ((cmdstr_ptr - cmdstr) + idx);
}
/*
* returns the index in the string just past where the address ends.
*/
-static int get_address(char *my_str, int *linenum, regex_t ** regex)
+static int get_address(const char *my_str, int *linenum, regex_t ** regex)
{
- char *pos=my_str;
+ const char *pos = my_str;
if (isdigit(*my_str)) {
- *linenum = strtol(my_str, &pos, 10);
+ *linenum = strtol(my_str, (char**)&pos, 10);
/* endstr shouldnt ever equal NULL */
} else if (*my_str == '$') {
*linenum = -1;
pos++;
} else if (*my_str == '/' || *my_str == '\\') {
- int next, idx_start = 1;
+ int next;
char delimiter;
+ char *temp;
delimiter = '/';
- if (*my_str == '\\') {
- idx_start++;
- delimiter = *(++pos);
- }
+ if (*my_str == '\\') delimiter = *++pos;
next = index_of_next_unescaped_regexp_delim(delimiter, ++pos);
- if (next == -1) {
- bb_error_msg_and_die("unterminated match expression");
- }
- pos += next;
- *pos = '\0';
-
- *regex = (regex_t *) xmalloc(sizeof(regex_t));
- xregcomp(*regex, my_str + idx_start, REG_NEWLINE);
- pos++; /* so it points to the next character after the last '/' */
+ temp = copy_parsing_escapes(pos, next);
+ *regex = xmalloc(sizeof(regex_t));
+ xregcomp(*regex, temp, G.regex_type|REG_NEWLINE);
+ free(temp);
+ /* Move position to next character after last delimiter */
+ pos += (next+1);
}
return pos - my_str;
}
-static int parse_subst_cmd(sed_cmd_t * const sed_cmd, const char *substr)
+/* Grab a filename. Whitespace at start is skipped, then goes to EOL. */
+static int parse_file_cmd(/*sed_cmd_t *sed_cmd,*/ const char *filecmdstr, char **retval)
{
- int cflags = 0;
+ int start = 0, idx, hack = 0;
+
+ /* Skip whitespace, then grab filename to end of line */
+ while (isspace(filecmdstr[start]))
+ start++;
+ idx = start;
+ while (filecmdstr[idx] && filecmdstr[idx] != '\n')
+ idx++;
+
+ /* If lines glued together, put backslash back. */
+ if (filecmdstr[idx] == '\n')
+ hack = 1;
+ if (idx == start)
+ bb_error_msg_and_die("empty filename");
+ *retval = xstrndup(filecmdstr+start, idx-start+hack+1);
+ if (hack)
+ (*retval)[idx] = '\\';
+
+ return idx;
+}
+
+static int parse_subst_cmd(sed_cmd_t *sed_cmd, const char *substr)
+{
+ int cflags = G.regex_type;
char *match;
- int idx = 0;
- int j;
+ int idx;
/*
- * the string that gets passed to this function should look like this:
- * s/match/replace/gIp
+ * A substitution command should look something like this:
+ * s/match/replace/ #gIpw
* || | |||
* mandatory optional
- *
- * (all three of the '/' slashes are mandatory)
*/
- idx = parse_regex_delim(substr, &match, &sed_cmd->replace);
+ idx = parse_regex_delim(substr, &match, &sed_cmd->string);
/* determine the number of back references in the match string */
/* Note: we compute this here rather than in the do_subst_command()
* function to save processor time, at the expense of a little more memory
* (4 bits) per sed_cmd */
- for (j = 0; match[j]; j++) {
- /* GNU/POSIX sed does not save more than nine backrefs */
- if (match[j] == '\\' && match[j + 1] == '('
- && sed_cmd->num_backrefs <= 9)
- sed_cmd->num_backrefs++;
- }
-
/* process the flags */
+
+ sed_cmd->which_match = 1;
while (substr[++idx]) {
- switch (substr[idx]) {
- case 'g':
+ /* Parse match number */
+ if (isdigit(substr[idx])) {
if (match[0] != '^') {
- sed_cmd->sub_g = 1;
+ /* Match 0 treated as all, multiple matches we take the last one. */
+ const char *pos = substr + idx;
+/* FIXME: error check? */
+ sed_cmd->which_match = (unsigned)strtol(substr+idx, (char**) &pos, 10);
+ idx = pos - substr;
}
+ continue;
+ }
+ /* Skip spaces */
+ if (isspace(substr[idx])) continue;
+
+ switch (substr[idx]) {
+ /* Replace all occurrences */
+ case 'g':
+ if (match[0] != '^')
+ sed_cmd->which_match = 0;
break;
- /* Hmm, i dont see the I option mentioned in the standard */
- case 'I':
- cflags |= REG_ICASE;
- break;
+ /* Print pattern space */
case 'p':
sed_cmd->sub_p = 1;
break;
+ /* Write to file */
+ case 'w':
+ {
+ char *temp;
+ idx += parse_file_cmd(/*sed_cmd,*/ substr+idx, &temp);
+ break;
+ }
+ /* Ignore case (gnu exension) */
+ case 'I':
+ cflags |= REG_ICASE;
+ break;
+ /* Comment */
+ case '#':
+ while (substr[++idx]) /*skip all*/;
+ /* Fall through */
+ /* End of command */
+ case ';':
+ case '}':
+ goto out;
default:
- /* any whitespace or semicolon trailing after a s/// is ok */
- if (strchr(semicolon_whitespace, substr[idx]))
- goto out;
- /* else */
bb_error_msg_and_die("bad option in substitution expression");
}
}
-
- out:
+out:
/* compile the match string into a regex */
if (*match != '\0') {
/* If match is empty, we use last regex used at runtime */
- sed_cmd->sub_match = (regex_t *) xmalloc(sizeof(regex_t));
+ sed_cmd->sub_match = xmalloc(sizeof(regex_t));
xregcomp(sed_cmd->sub_match, match, cflags);
}
free(match);
return idx;
}
-static void replace_slash_n(char *string)
-{
- char *dest;
-
- for (dest = string; *string; string++, dest++) {
- if ((string[0] == '\\') && (string[1] == 'n')) {
- *dest = '\n';
- string++;
- } else {
- *dest = *string;
- }
- }
- *dest=0;
-}
-
-static int parse_translate_cmd(sed_cmd_t * const sed_cmd, const char *cmdstr)
-{
- char *match;
- char *replace;
- int idx;
- int i;
-
- idx = parse_regex_delim(cmdstr, &match, &replace);
- replace_slash_n(match);
- replace_slash_n(replace);
- sed_cmd->translate = xcalloc(1, (strlen(match) + 1) * 2);
- for (i = 0; (match[i] != 0) && (replace[i] != 0); i++) {
- sed_cmd->translate[i * 2] = match[i];
- sed_cmd->translate[(i * 2) + 1] = replace[i];
- }
- return (idx + 1);
-}
-
-static int parse_edit_cmd(sed_cmd_t * sed_cmd, const char *editstr)
-{
- int i, j;
-
- /*
- * the string that gets passed to this function should look like this:
- *
- * need one of these
- * |
- * | this backslash (immediately following the edit command) is mandatory
- * | |
- * [aic]\
- * TEXT1\
- * TEXT2\
- * TEXTN
- *
- * as soon as we hit a TEXT line that has no trailing '\', we're done.
- * this means a command like:
- *
- * i\
- * INSERTME
- *
- * is a-ok.
- *
- */
- if ((*editstr != '\\') || ((editstr[1] != '\n') && (editstr[1] != '\r'))) {
- bb_error_msg_and_die("bad format in edit expression");
- }
-
- /* store the edit line text */
- sed_cmd->editline = xmalloc(strlen(&editstr[2]) + 2);
- for (i = 2, j = 0;
- editstr[i] != '\0' && strchr("\r\n", editstr[i]) == NULL; i++, j++) {
- if ((editstr[i] == '\\') && strchr("\n\r", editstr[i + 1]) != NULL) {
- sed_cmd->editline[j] = '\n';
- i++;
- } else
- sed_cmd->editline[j] = editstr[i];
- }
-
- /* figure out if we need to add a newline */
- if (sed_cmd->editline[j - 1] != '\n')
- sed_cmd->editline[j++] = '\n';
-
- /* terminate string */
- sed_cmd->editline[j] = '\0';
-
- return i;
-}
-
-
-static int parse_file_cmd(sed_cmd_t * sed_cmd, const char *filecmdstr)
-{
- int idx = 0;
- int filenamelen = 0;
-
- /*
- * the string that gets passed to this function should look like this:
- * '[ ]filename'
- * | |
- * | a filename
- * |
- * optional whitespace
-
- * re: the file to be read, the GNU manual says the following: "Note that
- * if filename cannot be read, it is treated as if it were an empty file,
- * without any error indication." Thus, all of the following commands are
- * perfectly legal:
- *
- * sed -e '1r noexist'
- * sed -e '1r ;'
- * sed -e '1r'
- */
-
- /* the file command may be followed by whitespace; move past it. */
- while (isspace(filecmdstr[++idx])) {;
- }
-
- /* the first non-whitespace we get is a filename. the filename ends when we
- * hit a normal sed command terminator or end of string */
- filenamelen = strcspn(&filecmdstr[idx], semicolon_whitespace);
- sed_cmd->filename = xmalloc(filenamelen + 1);
- safe_strncpy(sed_cmd->filename, &filecmdstr[idx], filenamelen + 1);
- return idx + filenamelen;
-}
-
/*
* Process the commands arguments
*/
-static char *parse_cmd_str(sed_cmd_t * sed_cmd, char *cmdstr)
+static const char *parse_cmd_args(sed_cmd_t *sed_cmd, const char *cmdstr)
{
/* handle (s)ubstitution command */
- if (sed_cmd->cmd == 's') {
+ if (sed_cmd->cmd == 's')
cmdstr += parse_subst_cmd(sed_cmd, cmdstr);
- }
/* handle edit cmds: (a)ppend, (i)nsert, and (c)hange */
else if (strchr("aic", sed_cmd->cmd)) {
if ((sed_cmd->end_line || sed_cmd->end_match) && sed_cmd->cmd != 'c')
bb_error_msg_and_die
("only a beginning address can be specified for edit commands");
- cmdstr += parse_edit_cmd(sed_cmd, cmdstr);
- }
+ for (;;) {
+ if (*cmdstr == '\n' || *cmdstr == '\\') {
+ cmdstr++;
+ break;
+ } else if (isspace(*cmdstr))
+ cmdstr++;
+ else
+ break;
+ }
+ sed_cmd->string = xstrdup(cmdstr);
+ /* "\anychar" -> "anychar" */
+ parse_escapes(sed_cmd->string, sed_cmd->string, strlen(cmdstr), '\0', '\0');
+ cmdstr += strlen(cmdstr);
/* handle file cmds: (r)ead */
- else if (sed_cmd->cmd == 'r') {
+ } else if (strchr("rw", sed_cmd->cmd)) {
if (sed_cmd->end_line || sed_cmd->end_match)
- bb_error_msg_and_die("Command only uses one address");
- cmdstr += parse_file_cmd(sed_cmd, cmdstr);
- }
+ bb_error_msg_and_die("command only uses one address");
+ cmdstr += parse_file_cmd(/*sed_cmd,*/ cmdstr, &sed_cmd->string);
+ if (sed_cmd->cmd == 'w') {
+ sed_cmd->sw_file = xfopen(sed_cmd->string, "w");
+ sed_cmd->sw_last_char = '\n';
+ }
/* handle branch commands */
- else if (strchr(":bt", sed_cmd->cmd)) {
+ } else if (strchr(":btT", sed_cmd->cmd)) {
int length;
- cmdstr += strspn(cmdstr, " ");
+ cmdstr = skip_whitespace(cmdstr);
length = strcspn(cmdstr, semicolon_whitespace);
if (length) {
- sed_cmd->label = strndup(cmdstr, length);
+ sed_cmd->string = xstrndup(cmdstr, length);
cmdstr += length;
}
}
/* translation command */
else if (sed_cmd->cmd == 'y') {
- cmdstr += parse_translate_cmd(sed_cmd, cmdstr);
+ char *match, *replace;
+ int i = cmdstr[0];
+
+ cmdstr += parse_regex_delim(cmdstr, &match, &replace)+1;
+ /* \n already parsed, but \delimiter needs unescaping. */
+ parse_escapes(match, match, strlen(match), i, i);
+ parse_escapes(replace, replace, strlen(replace), i, i);
+
+ sed_cmd->string = xzalloc((strlen(match) + 1) * 2);
+ for (i = 0; match[i] && replace[i]; i++) {
+ sed_cmd->string[i*2] = match[i];
+ sed_cmd->string[i*2+1] = replace[i];
+ }
+ free(match);
+ free(replace);
}
/* if it wasnt a single-letter command that takes no arguments
* then it must be an invalid command.
*/
- else if (strchr("dgGhHnNpPqx={}", sed_cmd->cmd) == 0) {
- bb_error_msg_and_die("Unsupported command %c", sed_cmd->cmd);
+ else if (strchr("dDgGhHlnNpPqx={}", sed_cmd->cmd) == 0) {
+ bb_error_msg_and_die("unsupported command %c", sed_cmd->cmd);
}
/* give back whatever's left over */
- return (cmdstr);
+ return cmdstr;
}
-static char *add_cmd(char *cmdstr)
+
+/* Parse address+command sets, skipping comment lines. */
+
+static void add_cmd(const char *cmdstr)
{
sed_cmd_t *sed_cmd;
+ int temp;
- /* Skip over leading whitespace and semicolons */
- cmdstr += strspn(cmdstr, semicolon_whitespace);
-
- /* if we ate the whole thing, that means there was just trailing
- * whitespace or a final / no-op semicolon. either way, get out */
- if (*cmdstr == '\0') {
- return (NULL);
+ /* Append this line to any unfinished line from last time. */
+ if (G.add_cmd_line) {
+ char *tp = xasprintf("%s\n%s", G.add_cmd_line, cmdstr);
+ free(G.add_cmd_line);
+ cmdstr = G.add_cmd_line = tp;
}
- /* 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') {
- be_quiet++;
- }
- return (strpbrk(cmdstr, "\n\r"));
+ /* If this line ends with backslash, request next line. */
+ temp = strlen(cmdstr);
+ if (temp && cmdstr[--temp] == '\\') {
+ if (!G.add_cmd_line)
+ G.add_cmd_line = xstrdup(cmdstr);
+ G.add_cmd_line[temp] = '\0';
+ return;
}
- /* parse the command
- * format is: [addr][,addr]cmd
- * |----||-----||-|
- * part1 part2 part3
- */
-
- sed_cmd = xcalloc(1, sizeof(sed_cmd_t));
-
- /* first part (if present) is an address: either a '$', a number or a /regex/ */
- cmdstr += get_address(cmdstr, &sed_cmd->beg_line, &sed_cmd->beg_match);
+ /* Loop parsing all commands in this line. */
+ while (*cmdstr) {
+ /* Skip leading whitespace and semicolons */
+ cmdstr += strspn(cmdstr, semicolon_whitespace);
+
+ /* If no more commands, exit. */
+ if (!*cmdstr) break;
+
+ /* if this is a comment, jump past it and keep going */
+ if (*cmdstr == '#') {
+ /* "#n" is the same as using -n on the command line */
+ if (cmdstr[1] == 'n')
+ G.be_quiet++;
+ cmdstr = strpbrk(cmdstr, "\n\r");
+ if (!cmdstr) break;
+ continue;
+ }
- /* second part (if present) will begin with a comma */
- if (*cmdstr == ',') {
- int idx;
+ /* parse the command
+ * format is: [addr][,addr][!]cmd
+ * |----||-----||-|
+ * part1 part2 part3
+ */
- cmdstr++;
- idx = get_address(cmdstr, &sed_cmd->end_line, &sed_cmd->end_match);
- if (idx == 0) {
- bb_error_msg_and_die("get_address: no address found in string\n"
- "\t(you probably didn't check the string you passed me)");
- }
- cmdstr += idx;
- }
+ sed_cmd = xzalloc(sizeof(sed_cmd_t));
- /* skip whitespace before the command */
- while (isspace(*cmdstr)) {
- cmdstr++;
- }
+ /* first part (if present) is an address: either a '$', a number or a /regex/ */
+ cmdstr += get_address(cmdstr, &sed_cmd->beg_line, &sed_cmd->beg_match);
- /* there my be the inversion flag between part2 and part3 */
- if (*cmdstr == '!') {
- sed_cmd->invert = 1;
- cmdstr++;
+ /* second part (if present) will begin with a comma */
+ if (*cmdstr == ',') {
+ int idx;
-#ifdef SED_FEATURE_STRICT_CHECKING
- /* According to the spec
- * It is unspecified whether <blank>s can follow a '!' character,
- * and conforming applications shall not follow a '!' character
- * with <blank>s.
- */
- if (isblank(cmdstr[idx]) {
- bb_error_msg_and_die("blank follows '!'");}
-#else
- /* skip whitespace before the command */
- while (isspace(*cmdstr)) {
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;
}
-#endif
- }
-
- /* last part (mandatory) will be a command */
- if (*cmdstr == '\0')
- bb_error_msg_and_die("missing command");
- sed_cmd->cmd = *cmdstr;
- cmdstr++;
+ /* skip whitespace before the command */
+ cmdstr = skip_whitespace(cmdstr);
- cmdstr = parse_cmd_str(sed_cmd, cmdstr);
+ /* Check for inversion flag */
+ if (*cmdstr == '!') {
+ sed_cmd->invert = 1;
+ cmdstr++;
- /* Add the command to the command array */
- sed_cmd_tail->next = sed_cmd;
- sed_cmd_tail = sed_cmd_tail->next;
+ /* skip whitespace before the command */
+ cmdstr = skip_whitespace(cmdstr);
+ }
- return (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);
-static void add_cmd_str(char *cmdstr)
-{
-#ifdef CONFIG_FEATURE_SED_EMBEDED_NEWLINE
- char *cmdstr_ptr = cmdstr;
-
- /* HACK: convert "\n" to match tranlated '\n' string */
- while ((cmdstr_ptr = strstr(cmdstr_ptr, "\\n")) != NULL) {
- cmdstr = xrealloc(cmdstr, strlen(cmdstr) + 2);
- cmdstr_ptr = strstr(cmdstr, "\\n");
- memmove(cmdstr_ptr + 1, cmdstr_ptr, strlen(cmdstr_ptr) + 1);
- cmdstr_ptr[0] = '\\';
- cmdstr_ptr += 3;
+ /* Add the command to the command array */
+ G.sed_cmd_tail->next = sed_cmd;
+ G.sed_cmd_tail = G.sed_cmd_tail->next;
}
-#endif
- do {
- cmdstr = add_cmd(cmdstr);
- } while (cmdstr && strlen(cmdstr));
-}
-
-static void load_cmd_file(char *filename)
-{
- FILE *cmdfile;
- char *line;
- char *nextline;
- char *e;
-
- cmdfile = bb_xfopen(filename, "r");
-
- while ((line = bb_get_line_from_file(cmdfile)) != NULL) {
- /* if a line ends with '\' it needs the next line appended to it */
- while (((e = last_char_is(line, '\n')) != NULL)
- && (e > line) && (e[-1] == '\\')
- && ((nextline = bb_get_line_from_file(cmdfile)) != NULL)) {
- line = xrealloc(line, (e - line) + 1 + strlen(nextline) + 1);
- strcat(line, nextline);
- free(nextline);
- }
- /* eat trailing newline (if any) --if I don't do this, edit commands
- * (aic) will print an extra newline */
- chomp(line);
- add_cmd_str(line);
- free(line);
- }
+ /* If we glued multiple lines together, free the memory. */
+ free(G.add_cmd_line);
+ G.add_cmd_line = NULL;
}
-struct pipeline {
- char *buf;
- int idx;
- int len;
-};
+/* Append to a string, reallocating memory as necessary. */
-#define PIPE_MAGIC 0x7f
#define PIPE_GROW 64
-void pipe_putc(struct pipeline *const pipeline, char c)
+static void pipe_putc(char c)
{
- if (pipeline->buf[pipeline->idx] == PIPE_MAGIC) {
- pipeline->buf = xrealloc(pipeline->buf, pipeline->len + PIPE_GROW);
- memset(pipeline->buf + pipeline->len, 0, PIPE_GROW);
- pipeline->len += PIPE_GROW;
- pipeline->buf[pipeline->len - 1] = PIPE_MAGIC;
+ if (G.pipeline.idx == G.pipeline.len) {
+ G.pipeline.buf = xrealloc(G.pipeline.buf,
+ G.pipeline.len + PIPE_GROW);
+ G.pipeline.len += PIPE_GROW;
}
- pipeline->buf[pipeline->idx++] = (c);
+ G.pipeline.buf[G.pipeline.idx++] = c;
}
-#define pipeputc(c) pipe_putc(pipeline, c)
-
-static void print_subst_w_backrefs(const char *line, const char *replace,
- regmatch_t * regmatch, struct pipeline *const pipeline, int matches)
+static void do_subst_w_backrefs(char *line, char *replace)
{
- int i;
+ 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] == '\\' && isdigit(replace[i + 1])) {
- int j;
- char tmpstr[2];
- int backref;
-
- ++i; /* i now indexes the backref number, instead of the leading slash */
- tmpstr[0] = replace[i];
- tmpstr[1] = 0;
- backref = atoi(tmpstr);
- /* print out the text held in regmatch[backref] */
- if (backref <= matches && regmatch[backref].rm_so != -1)
- for (j = regmatch[backref].rm_so; j < regmatch[backref].rm_eo;
- j++)
- pipeputc(line[j]);
- }
-
- /* if we find a backslash escaped character, print the character */
- else if (replace[i] == '\\') {
- ++i;
- pipeputc(replace[i]);
+ 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.
- * fortunately, regmatch[0] contains the indicies to the whole matched
- * expression (kinda seems like it was designed for just such a
- * purpose...) */
- else if (replace[i] == '&') {
- int j;
-
- for (j = regmatch[0].rm_so; j < regmatch[0].rm_eo; j++)
- pipeputc(line[j]);
+ /* 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;
}
- /* nothing special, just print this char of the replacement string to stdout */
- else
- pipeputc(replace[i]);
+ /* Otherwise just output the character. */
+ pipe_putc(replace[i]);
}
}
-static int do_subst_command(sed_cmd_t * sed_cmd, char **line)
+static int do_subst_command(sed_cmd_t *sed_cmd, char **line)
{
- char *hackline = *line;
- struct pipeline thepipe = { NULL, 0, 0 };
- struct pipeline *const pipeline = &thepipe;
+ char *oldline = *line;
int altered = 0;
- int result;
- regmatch_t *regmatch = NULL;
+ unsigned match_count = 0;
regex_t *current_regex;
+ /* Handle empty regex. */
if (sed_cmd->sub_match == NULL) {
- current_regex = previous_regex_ptr;
- } else {
- previous_regex_ptr = current_regex = sed_cmd->sub_match;
- }
- result = regexec(current_regex, hackline, 0, NULL, 0);
-
- /* we only proceed if the substitution 'search' expression matches */
- if (result == REG_NOMATCH) {
+ current_regex = G.previous_regex_ptr;
+ if (!current_regex)
+ bb_error_msg_and_die("no previous regexp");
+ } else
+ G.previous_regex_ptr = current_regex = sed_cmd->sub_match;
+
+ /* Find the first match */
+ if (REG_NOMATCH == regexec(current_regex, oldline, 10, G.regmatch, 0))
return 0;
- }
- /* whaddaya know, it matched. get the number of back references */
- regmatch = xmalloc(sizeof(regmatch_t) * (sed_cmd->num_backrefs + 1));
-
- /* allocate more PIPE_GROW bytes
- if replaced string is larger than original */
- thepipe.len = strlen(hackline) + PIPE_GROW;
- thepipe.buf = xcalloc(1, thepipe.len);
- /* buffer magic */
- thepipe.buf[thepipe.len - 1] = PIPE_MAGIC;
-
- /* and now, as long as we've got a line to try matching and if we can match
- * the search string, we make substitutions */
- while ((*hackline || !altered)
- && (regexec(current_regex, hackline, sed_cmd->num_backrefs + 1,
- regmatch, 0) != REG_NOMATCH)) {
+ /* 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(*oldline++);
+ 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(*oldline++);
+ continue;
+ }
+
/* print everything before the match */
- for (i = 0; i < regmatch[0].rm_so; i++)
- pipeputc(hackline[i]);
+ for (i = 0; i < G.regmatch[0].rm_so; i++)
+ pipe_putc(oldline[i]);
/* then print the substitution string */
- print_subst_w_backrefs(hackline, sed_cmd->replace, regmatch, pipeline,
- sed_cmd->num_backrefs);
+ do_subst_w_backrefs(oldline, sed_cmd->string);
/* advance past the match */
- hackline += regmatch[0].rm_eo;
+ oldline += G.regmatch[0].rm_eo;
/* flag that something has changed */
altered++;
/* if we're not doing this globally, get out now */
- if (!sed_cmd->sub_g) {
+ if (sed_cmd->which_match)
break;
- }
- }
- for (; *hackline; hackline++)
- pipeputc(*hackline);
- if (thepipe.buf[thepipe.idx] == PIPE_MAGIC)
- thepipe.buf[thepipe.idx] = 0;
+ } while (*oldline && (regexec(current_regex, oldline, 10, G.regmatch, 0) != REG_NOMATCH));
+
+ /* Copy rest of string into output pipeline */
- /* cleanup */
- free(regmatch);
+ while (*oldline)
+ pipe_putc(*oldline++);
+ pipe_putc(0);
free(*line);
- *line = thepipe.buf;
+ *line = G.pipeline.buf;
return altered;
}
-static sed_cmd_t *branch_to(const char *label)
+/* 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 = sed_cmd_head.next; sed_cmd; sed_cmd = sed_cmd->next) {
- if ((sed_cmd->cmd == ':') && (sed_cmd->label) && (strcmp(sed_cmd->label, label) == 0)) {
- return (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);
+ bb_error_msg_and_die("can't find label for jump to '%s'", label);
}
-static void process_file(FILE * file)
+static void append(char *s)
{
- char *pattern_space; /* Posix requires it be able to hold at least 8192 bytes */
- char *hold_space = NULL; /* Posix requires it be able to hold at least 8192 bytes */
- static int linenum = 0; /* GNU sed does not restart counting lines at EOF */
- int altered;
- int force_print;
-
- pattern_space = bb_get_chomped_line_from_file(file);
- if (pattern_space == NULL) {
- return;
- }
-
- /* go through every line in the file */
- do {
- char *next_line;
- sed_cmd_t *sed_cmd;
- int substituted = 0;
- /* This enables whole blocks of commands to be mask'ed out if the lead address doesnt match */
- int block_mask = 1;
-
- /* Read one line in advance so we can act on the last line, the '$' address */
- next_line = bb_get_chomped_line_from_file(file);
- linenum++;
- altered = 0;
- force_print = 0;
-
- /* for every line, go through all the commands */
- for (sed_cmd = sed_cmd_head.next; sed_cmd; sed_cmd = sed_cmd->next) {
- int deleted = 0;
-
- /*
- * entry point into sedding...
- */
- int matched = (
- /* no range necessary */
- (sed_cmd->beg_line == 0 && sed_cmd->end_line == 0
- && sed_cmd->beg_match == NULL
- && sed_cmd->end_match == NULL) ||
- /* this line number is the first address we're looking for */
- (sed_cmd->beg_line > 0 && (sed_cmd->beg_line == linenum)) ||
- /* this line matches our first address regex */
- (sed_cmd->beg_match
- && (regexec(sed_cmd->beg_match, pattern_space, 0, NULL,
- 0) == 0)) ||
- /* we are currently within the beginning & ending address range */
- sed_cmd->still_in_range || ((sed_cmd->beg_line == -1)
- && (next_line == NULL))
- );
- if (sed_cmd->cmd == '{') {
- block_mask = block_mask & matched;
- }
-// matched &= block_mask;
+ llist_add_to_end(&G.append_head, xstrdup(s));
+}
- if (sed_cmd->invert ^ (matched & block_mask)) {
- /* Update last used regex incase a blank substitute BRE is found */
- if (sed_cmd->beg_match) {
- previous_regex_ptr = sed_cmd->beg_match;
- }
+static void flush_append(void)
+{
+ char *data;
- /*
- * actual sedding
- */
- switch (sed_cmd->cmd) {
- case '=':
- printf("%d\n", linenum);
- break;
- case 'P':{
- /* Write the current pattern space upto the first newline */
- char *tmp = strchr(pattern_space, '\n');
+ /* Output appended lines. */
+ while ((data = (char *)llist_pop(&G.append_head))) {
+ fprintf(G.nonstdout, "%s\n", data);
+ free(data);
+ }
+}
- if (tmp) {
- *tmp = '\0';
- }
- }
- case 'p': /* Write the current pattern space to output */
- puts(pattern_space);
- break;
- case 'd':
- altered++;
- deleted = 1;
- force_print = 0;
- break;
+static void add_input_file(FILE *file)
+{
+ G.input_file_list = xrealloc(G.input_file_list,
+ (G.input_file_count + 1) * sizeof(FILE *));
+ G.input_file_list[G.input_file_count++] = file;
+}
- case 's':
-
- /*
- * Some special cases for 's' printing to make it compliant with
- * GNU sed printing behavior (aka "The -n | s///p Matrix"):
- *
- * -n ONLY = never print anything regardless of any successful
- * substitution
- *
- * s///p ONLY = always print successful substitutions, even if
- * the pattern_space is going to be printed anyway (pattern_space
- * will be printed twice).
- *
- * -n AND s///p = print ONLY a successful substitution ONE TIME;
- * no other lines are printed - this is the reason why the 'p'
- * flag exists in the first place.
- */
-
-#ifdef CONFIG_FEATURE_SED_EMBEDED_NEWLINE
- /* HACK: escape newlines twice so regex can match them */
- {
- int offset = 0;
-
- while (strchr(pattern_space + offset, '\n') != NULL) {
- char *tmp;
-
- pattern_space =
- xrealloc(pattern_space,
- strlen(pattern_space) + 2);
- tmp = strchr(pattern_space + offset, '\n');
- memmove(tmp + 1, tmp, strlen(tmp) + 1);
- tmp[0] = '\\';
- tmp[1] = 'n';
- offset = tmp - pattern_space + 2;
- }
+/* 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;
}
-#endif
- /* we print the pattern_space once, unless we were told to be quiet */
- substituted |= do_subst_command(sed_cmd, &pattern_space);
+ }
+ /* else we put NO_EOL_CHAR into *gets_char */
+ break;
-#ifdef CONFIG_FEATURE_SED_EMBEDED_NEWLINE
- /* undo HACK: escape newlines twice so regex can match them */
- {
- char *tmp = pattern_space;
+ /* 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;
+}
- while ((tmp = strstr(tmp, "\\n")) != NULL) {
- memmove(tmp, tmp + 1, strlen(tmp + 1) + 1);
- tmp[0] = '\n';
- }
- }
-#endif
- if (!be_quiet && substituted && ((sed_cmd->next == NULL)
- || (sed_cmd->next->cmd != 's'))) {
- force_print = 1;
- }
+/* 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;
- /* we also print the line if we were given the 'p' flag
- * (this is quite possibly the second printing) */
- if ((sed_cmd->sub_p) && altered) {
- puts(pattern_space);
- }
- break;
- case 'a':
- puts(pattern_space);
- fputs(sed_cmd->editline, stdout);
- altered++;
- break;
+ /* 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;
+ }
- case 'i':
- fputs(sed_cmd->editline, stdout);
- break;
+ 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;
+}
- case 'c':
- /* single-address case */
- if ((sed_cmd->end_match == NULL && sed_cmd->end_line == 0)
- /* multi-address case */
- /* - matching text */
- || (sed_cmd->end_match
- && (regexec(sed_cmd->end_match, pattern_space, 0,
- NULL, 0) == 0))
- /* - matching line numbers */
- || (sed_cmd->end_line > 0
- && sed_cmd->end_line == linenum)) {
- fputs(sed_cmd->editline, stdout);
- }
- altered++;
+#define sed_puts(s, n) (puts_maybe_newline(s, G.nonstdout, &last_puts_char, n))
- break;
+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;
+}
- case 'r':{
- FILE *outfile;
-
- outfile = fopen(sed_cmd->filename, "r");
- if (outfile) {
- char *line;
-
- while ((line =
- bb_get_chomped_line_from_file(outfile)) !=
- NULL) {
- pattern_space =
- xrealloc(pattern_space,
- strlen(line) + strlen(pattern_space) + 2);
- strcat(pattern_space, "\n");
- strcat(pattern_space, line);
- }
- bb_xprint_and_close_file(outfile);
- }
+/* 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++;
+ restart:
+ /* for every line, go through all the commands */
+ 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: */
+
+ /* 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->beg_line == linenum))
+ /* 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;
+
+ /* Is this line the end of the current match? */
+
+ if (matched) {
+ 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) {
+ while (sed_cmd->cmd != '}') {
+ sed_cmd = sed_cmd->next;
+ if (!sed_cmd)
+ bb_error_msg_and_die("unterminated {");
}
- break;
- case 'q': /* Branch to end of script and quit */
- deleted = 1;
- /* Exit the outer while loop */
- free(next_line);
- next_line = NULL;
- break;
- case 'n': /* Read next line from input */
- if (!be_quiet) {
- puts(pattern_space);
- }
- if (next_line) {
- free(pattern_space);
- pattern_space = next_line;
- next_line = bb_get_chomped_line_from_file(file);
- linenum++;
- } else {
- /* Jump to end of script and exist */
- deleted = 1;
- free(next_line);
- next_line = NULL;
- }
- break;
- case 'N': /* Append the next line to the current line */
- if (next_line) {
- pattern_space =
- realloc(pattern_space,
- strlen(pattern_space) + strlen(next_line) + 2);
- strcat(pattern_space, "\n");
- strcat(pattern_space, next_line);
- next_line = bb_get_chomped_line_from_file(file);
- linenum++;
- } else {
- /* Jump to end of script and exist */
- deleted = 1;
- free(next_line);
- next_line = NULL;
- }
- break;
- case 't':
- if (substituted)
- /* Fall through */
- case 'b':
- {
- if (sed_cmd->label == NULL) {
- /* Jump to end of script */
- deleted = 1;
- } else {
- sed_cmd = branch_to(sed_cmd->label);
- }
- /* Reset the substitution flag */
- substituted = 0;
- }
- break;
- case 'y':{
- int i;
+ }
+ continue;
+ }
- for (i = 0; pattern_space[i] != 0; i++) {
- int j;
+ /* Okay, so did this line match? */
+ if (sed_cmd->invert ? !matched : matched) {
+ /* 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;
+ }
- for (j = 0; sed_cmd->translate[j]; j += 2) {
- if (pattern_space[i] == sed_cmd->translate[j]) {
- pattern_space[i] = sed_cmd->translate[j + 1];
- }
- }
- }
- }
- break;
- case 'g': /* Replace pattern space with hold space */
- free(pattern_space);
- if (hold_space) {
- pattern_space = strdup(hold_space);
- }
- break;
- case 'G': { /* Append newline and hold space to pattern space */
- int pattern_space_size = 2;
- int hold_space_size = 0;
+ /* actual sedding */
+ switch (sed_cmd->cmd) {
- if (pattern_space) {
- pattern_space_size += strlen(pattern_space);
- }
- if (hold_space) {
- hold_space_size = strlen(hold_space);
- }
- pattern_space = xrealloc(pattern_space, pattern_space_size + hold_space_size);
- if (pattern_space_size == 2) {
- strcat(pattern_space, "\n");
- } else {
- strcpy(pattern_space, "\n");
- }
- if (hold_space) {
- strcat(pattern_space, hold_space);
- }
+ /* 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;
}
- case 'h': /* Replace hold space with pattern space */
- free(hold_space);
- hold_space = strdup(pattern_space);
- break;
- case 'H': { /* Append newline and pattern space to hold space */
- int hold_space_size = 2;
- int pattern_space_size = 0;
+ /* Fall Through */
+ }
- if (hold_space) {
- hold_space_size += strlen(hold_space);
- }
- if (pattern_space) {
- pattern_space_size = strlen(pattern_space);
- }
- hold_space = xrealloc(hold_space, hold_space_size + pattern_space_size);
+ /* 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 (hold_space_size == 2) {
- strcpy(hold_space, "\n");
- } else {
- strcat(hold_space, "\n");
- }
- if (pattern_space) {
- strcat(hold_space, pattern_space);
- }
+ if (tmp) {
+ tmp = xstrdup(tmp+1);
+ free(pattern_space);
+ pattern_space = tmp;
+ 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, NO_EOL_CHAR);
+ goto discard_line;
+
+ /* Read file, append contents to output */
+ case 'r':
+ {
+ FILE *rfile;
+
+ rfile = fopen(sed_cmd->string, "r");
+ if (rfile) {
+ char *line;
+
+ while ((line = xmalloc_fgetline(rfile))
+ != NULL)
+ append(line);
+ xprint_and_close_file(rfile);
}
- case 'x':{
- /* Swap hold and pattern space */
- char *tmp = pattern_space;
- pattern_space = hold_space;
- hold_space = tmp;
+
+ 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) {
+ /* Jump to end of script and exit */
+ free(next_line);
+ next_line = NULL;
+ goto discard_line;
+ /* append next_line, read new next_line. */
}
+ len = strlen(pattern_space);
+ pattern_space = realloc(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;
}
- /*
- * exit point from sedding...
- */
- if (matched) {
- if (
- /* this is a single-address command or... */
- (sed_cmd->end_line == 0 && sed_cmd->end_match == NULL)
- /* If only one address */
- /* we were in the middle of our address range (this
- * isn't the first time through) and.. */
- || ((sed_cmd->still_in_range == 1)
- /* this line number is the last address we're looking for or... */
- && ((sed_cmd->end_line > 0
- && (sed_cmd->end_line == linenum))
- /* this line matches our last address regex */
- || (sed_cmd->end_match
- && (regexec(sed_cmd->end_match, pattern_space,
- 0, NULL, 0) == 0))))) {
- /* we're out of our address range */
- sed_cmd->still_in_range = 0;
- } else {
- /* didn't hit the exit? then we're still in the middle of an address range */
- sed_cmd->still_in_range = 1;
+ /* 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;
+ }
+ }
}
- }
- if (sed_cmd->cmd == '}') {
- block_mask = 1;
+ 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';
- if (deleted)
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 ? : xzalloc(1);
+ last_gets_char = '\n';
+ G.hold_space = tmp;
+ break;
+ }
+ }
}
+ }
+
+ /*
+ * 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.
+ */
- /* we will print the line unless we were told to be quiet or if the
- * line was altered (via a 'd'elete or 's'ubstitution), in which case
- * the altered line was already printed */
- if ((!be_quiet && !altered && !substituted) || force_print) {
- puts(pattern_space);
+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) {
+ strcpy(eol-1, eol);
+ eol = strchr(eol, '\n');
+ goto next;
+ }
+ *eol = '\0';
}
- free(pattern_space);
- pattern_space = next_line;
- } while (pattern_space);
+ add_cmd(cmdstr);
+ cmdstr = eol + 1;
+ } while (eol);
+ free(sv);
}
-extern int sed_main(int argc, char **argv)
+int sed_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int sed_main(int argc UNUSED_PARAM, char **argv)
{
- int opt, status = EXIT_SUCCESS;
+ enum {
+ OPT_in_place = 1 << 0,
+ };
+ unsigned opt;
+ llist_t *opt_e, *opt_f;
+ int status = EXIT_SUCCESS;
+
+ INIT_G();
-#if 0 /* This doesnt seem to be working */
-#ifdef CONFIG_FEATURE_CLEAN_UP
/* destroy command strings on exit */
- if (atexit(destroy_cmd_strs) == -1)
- bb_perror_msg_and_die("atexit");
-#endif
-#endif
+ 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 */
- while ((opt = getopt(argc, argv, "ne:f:")) > 0) {
- switch (opt) {
- case 'n':
- be_quiet++;
- break;
- case 'e':{
- add_cmd_str(optarg);
- break;
- }
- case 'f':
- load_cmd_file(optarg);
- break;
- default:
- bb_show_usage();
+ opt_e = opt_f = NULL;
+ opt_complementary = "e::f::" /* can occur multiple times */
+ "nn"; /* count -n */
+ 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(llist_pop(&opt_f), "r");
+ while ((line = xmalloc_fgetline(cmdfile)) != NULL) {
+ add_cmd(line);
+ free(line);
}
+ fclose(cmdfile);
}
-
- /* 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.next == NULL) {
- if (argv[optind] == NULL)
+ /* if we didn't get a pattern from -e or -f, use argv[0] */
+ if (!(opt & 0x18)) {
+ if (!*argv)
bb_show_usage();
- else
- add_cmd_str(argv[optind++]);
+ add_cmd_block(*argv++);
}
+ /* Flush any unfinished commands. */
+ add_cmd("");
+
+ /* By default, we write to stdout */
+ G.nonstdout = stdout;
- /* argv[(optind)..(argc-1)] should be names of file to process. If no
+ /* 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[optind] == NULL) {
- process_file(stdin);
+ if (argv[0] == NULL) {
+ if (opt & OPT_in_place)
+ bb_error_msg_and_die(bb_msg_requires_arg, "-i");
+ add_input_file(stdin);
+ process_files();
} else {
int i;
FILE *file;
- for (i = optind; i < argc; i++) {
- if(!strcmp(argv[i], "-")) {
- process_file(stdin);
- } else {
- file = bb_wfopen(argv[i], "r");
- if (file) {
- process_file(file);
- fclose(file);
- } else {
- status = EXIT_FAILURE;
- }
+ 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("cannot create temp file %s", G.outname);
+ G.nonstdout = fdopen(nonstdoutfd, "w");
+
+ /* Set permissions of output file */
+
+ fstat(fileno(file), &statbuf);
+ fchmod(nonstdoutfd, statbuf.st_mode);
+ 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;
}
+ if (G.input_file_count > G.current_input_file)
+ process_files();
}
-#ifdef CONFIG_FEATURE_CLEAN_UP
- destroy_cmd_strs();
-#endif
return status;
}
projects / oweals / busybox.git / blobdiff