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Copy pathsed.c
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sed.c
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/* 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 <[email protected]>
* Copyright (C) 2002 Matt Kraai
* Copyright (C) 2003 by Glenn McGrath
* Copyright (C) 2003,2004 by Rob Landley <[email protected]>
*
* MAINTAINER: Rob Landley <[email protected]>
*
* Licensed under GPLv2, see file LICENSE in this source tree.
*/
/* 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).
*
* process_files() does actual sedding, reading data lines from each input FILE*
* (which could be stdin) and applying the sed command list (sed_cmd_head) to
* each of the resulting lines.
*
* sed_main() is where external code calls into this, with a command line.
*/
/* Supported features and commands in this version of sed:
*
* - comments ('#')
* - address matching: num|/matchstr/[,num|/matchstr/|$]command
* - commands: (p)rint, (d)elete, (s)ubstitue (with g & I flags)
* - edit commands: (a)ppend, (i)nsert, (c)hange
* - file commands: (r)ead
* - backreferences in substitution expressions (\0, \1, \2...\9)
* - grouped commands: {cmd1;cmd2}
* - transliteration (y/source-chars/dest-chars/)
* - pattern space hold space storing / swapping (g, h, x)
* - labels / branching (: label, b, t, T)
*
* (Note: Specifying an address (range) to match is *optional*; commands
* default to the whole pattern space if no specific address match was
* requested.)
*
* Todo:
* - Create a wrapper around regex to make libc's regex conform with sed
*
* Reference
* http://www.opengroup.org/onlinepubs/007904975/utilities/sed.html
* http://pubs.opengroup.org/onlinepubs/9699919799/utilities/sed.html
* http://sed.sourceforge.net/sedfaq3.html
*/
//config:config SED
//config: bool "sed"
//config: default y
//config: help
//config: sed is used to perform text transformations on a file
//config: or input from a pipeline.
//kbuild:lib-$(CONFIG_SED) += sed.o
//applet:IF_SED(APPLET(sed, BB_DIR_BIN, BB_SUID_DROP))
//usage:#define sed_trivial_usage
//usage: "[-inrE] [-f FILE]... [-e CMD]... [FILE]...\n"
//usage: "or: sed [-inrE] CMD [FILE]..."
//usage:#define sed_full_usage "\n\n"
//usage: " -e CMD Add CMD to sed commands to be executed"
//usage: "\n -f FILE Add FILE contents to sed commands to be executed"
//usage: "\n -i[SFX] Edit files in-place (otherwise sends to stdout)"
//usage: "\n Optionally back files up, appending SFX"
//usage: "\n -n Suppress automatic printing of pattern space"
//usage: "\n -r,-E Use extended regex syntax"
//usage: "\n"
//usage: "\nIf no -e or -f, the first non-option argument is the sed command string."
//usage: "\nRemaining arguments are input files (stdin if none)."
//usage:
//usage:#define sed_example_usage
//usage: "$ echo \"foo\" | sed -e 's/f[a-zA-Z]o/bar/g'\n"
//usage: "bar\n"
#include "libbb.h"
#include "common_bufsiz.h"
#include "xregex.h"
#if 0
# define dbg(...) bb_error_msg(__VA_ARGS__)
#else
# define dbg(...) ((void)0)
#endif
enum {
OPT_in_place = 1 << 0,
};
/* Each sed command turns into one of these structures. */
typedef struct sed_cmd_s {
/* 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' */
regex_t *sub_match; /* For 's/sub_match/string/' */
int beg_line; /* 'sed 1p' 0 == apply commands to all lines */
int beg_line_orig; /* copy of the above, needed for -i */
int end_line; /* 'sed 1,3p' 0 == one line only. -1 = last line ($). -2-N = +N */
int end_line_orig;
FILE *sw_file; /* File (sw) command writes to, NULL for none. */
char *string; /* Data string for (saicytb) commands. */
unsigned which_match; /* (s) Which match to replace (0 for all) */
/* 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 */
char sw_last_char; /* Last line written by (sw) had no '\n' */
/* GENERAL FIELDS */
char cmd; /* The command char: abcdDgGhHilnNpPqrstwxy:={} */
} sed_cmd_t;
static const char semicolon_whitespace[] ALIGN1 = "; \n\r\t\v";
struct globals {
/* options */
int be_quiet, regex_type;
FILE *nonstdout;
char *outname, *hold_space;
smallint exitcode;
/* list of input files */
int current_input_file, last_input_file;
char **input_file_list;
FILE *current_fp;
regmatch_t regmatch[10];
regex_t *previous_regex_ptr;
/* linked list of sed commands */
sed_cmd_t *sed_cmd_head, **sed_cmd_tail;
/* linked list of append lines */
llist_t *append_head;
char *add_cmd_line;
struct pipeline {
char *buf; /* Space to hold string */
int idx; /* Space used */
int len; /* Space allocated */
} pipeline;
} FIX_ALIASING;
#define G (*(struct globals*)bb_common_bufsiz1)
#define INIT_G() do { \
setup_common_bufsiz(); \
BUILD_BUG_ON(sizeof(G) > COMMON_BUFSIZE); \
G.sed_cmd_tail = &G.sed_cmd_head; \
} while (0)
#if ENABLE_FEATURE_CLEAN_UP
static void sed_free_and_close_stuff(void)
{
sed_cmd_t *sed_cmd = G.sed_cmd_head;
llist_free(G.append_head, free);
while (sed_cmd) {
sed_cmd_t *sed_cmd_next = sed_cmd->next;
if (sed_cmd->sw_file)
fclose(sed_cmd->sw_file);
if (sed_cmd->beg_match) {
regfree(sed_cmd->beg_match);
free(sed_cmd->beg_match);
}
if (sed_cmd->end_match) {
regfree(sed_cmd->end_match);
free(sed_cmd->end_match);
}
if (sed_cmd->sub_match) {
regfree(sed_cmd->sub_match);
free(sed_cmd->sub_match);
}
free(sed_cmd->string);
free(sed_cmd);
sed_cmd = sed_cmd_next;
}
free(G.hold_space);
if (G.current_fp)
fclose(G.current_fp);
}
#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 unsigned parse_escapes(char *dest, const char *string, int len, char from, char to)
{
char *d = dest;
int i = 0;
if (len == -1)
len = strlen(string);
while (i < len) {
if (string[i] == '\\') {
if (!to || string[i+1] == from) {
if ((*d = to ? to : string[i+1]) == '\0')
return d - dest;
i += 2;
d++;
continue;
}
i++; /* skip backslash in string[] */
*d++ = '\\';
/* fall through: copy next char verbatim */
}
if ((*d = string[i++]) == '\0')
return d - dest;
d++;
}
*d = '\0';
return d - dest;
}
static char *copy_parsing_escapes(const char *string, int len)
{
const char *s;
char *dest = xmalloc(len + 1);
/* sed recognizes \n */
/* GNU sed also recognizes \t and \r */
for (s = "\nn\tt\rr"; *s; s += 2) {
len = parse_escapes(dest, string, len, s[1], s[0]);
string = dest;
}
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 preceded by
* a backslash ('\'). A negative delimiter disables square bracket checking.
*/
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]) != '\0'; idx++) {
if (bracket >= 0) {
if (ch == ']'
&& !(bracket == idx - 1 || (bracket == idx - 2 && str[idx - 1] == '^'))
) {
bracket = -1;
}
} else if (escaped)
escaped = 0;
else if (ch == '\\')
escaped = 1;
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 */
bb_error_msg_and_die("unmatched '%c'", delimiter);
}
/*
* Returns the index of the third delimiter
*/
static int parse_regex_delim(const char *cmdstr, char **match, char **replace)
{
const char *cmdstr_ptr = cmdstr;
unsigned char delimiter;
int idx = 0;
/* 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 substitution expression");
delimiter = *cmdstr_ptr++;
/* save the match string */
idx = index_of_next_unescaped_regexp_delim(delimiter, cmdstr_ptr);
*match = copy_parsing_escapes(cmdstr_ptr, idx);
/* save the replacement string */
cmdstr_ptr += idx + 1;
idx = index_of_next_unescaped_regexp_delim(- (int)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(const char *my_str, int *linenum, regex_t ** regex)
{
const char *pos = my_str;
if (isdigit(*my_str)) {
*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;
char delimiter;
char *temp;
delimiter = '/';
if (*my_str == '\\')
delimiter = *++pos;
next = index_of_next_unescaped_regexp_delim(delimiter, ++pos);
temp = copy_parsing_escapes(pos, next);
*regex = xzalloc(sizeof(regex_t));
xregcomp(*regex, temp, G.regex_type);
free(temp);
/* Move position to next character after last delimiter */
pos += (next+1);
}
return pos - my_str;
}
/* 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 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;
/*
* A substitution command should look something like this:
* s/match/replace/ #giIpw
* || | |||
* mandatory optional
*/
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 */
/* process the flags */
sed_cmd->which_match = 1;
dbg("s flags:'%s'", substr + idx + 1);
while (substr[++idx]) {
dbg("s flag:'%c'", substr[idx]);
/* Parse match number */
if (isdigit(substr[idx])) {
if (match[0] != '^') {
/* 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 - 1;
}
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;
/* Print pattern space */
case 'p':
sed_cmd->sub_p = 1;
break;
/* Write to file */
case 'w':
{
char *fname;
idx += parse_file_cmd(/*sed_cmd,*/ substr+idx+1, &fname);
sed_cmd->sw_file = xfopen_for_write(fname);
sed_cmd->sw_last_char = '\n';
free(fname);
break;
}
/* Ignore case (gnu exension) */
case 'i':
case 'I':
cflags |= REG_ICASE;
break;
/* Comment */
case '#':
// while (substr[++idx]) continue;
idx += strlen(substr + idx); // same
/* Fall through */
/* End of command */
case ';':
case '}':
goto out;
default:
dbg("s bad flags:'%s'", substr + idx);
bb_error_msg_and_die("bad option in substitution expression");
}
}
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 = xzalloc(sizeof(regex_t));
dbg("xregcomp('%s',%x)", match, cflags);
xregcomp(sed_cmd->sub_match, match, cflags);
dbg("regcomp ok");
}
free(match);
return idx;
}
/*
* Process the commands arguments
*/
static const char *parse_cmd_args(sed_cmd_t *sed_cmd, const char *cmdstr)
{
static const char cmd_letters[] ALIGN1 = "saicrw:btTydDgGhHlnNpPqx={}";
enum {
IDX_s = 0,
IDX_a,
IDX_i,
IDX_c,
IDX_r,
IDX_w,
IDX_colon,
IDX_b,
IDX_t,
IDX_T,
IDX_y,
IDX_d,
IDX_D,
IDX_g,
IDX_G,
IDX_h,
IDX_H,
IDX_l,
IDX_n,
IDX_N,
IDX_p,
IDX_P,
IDX_q,
IDX_x,
IDX_equal,
IDX_lbrace,
IDX_rbrace,
IDX_nul
};
unsigned idx;
BUILD_BUG_ON(sizeof(cmd_letters)-1 != IDX_nul);
idx = strchrnul(cmd_letters, sed_cmd->cmd) - cmd_letters;
/* handle (s)ubstitution command */
if (idx == IDX_s) {
cmdstr += parse_subst_cmd(sed_cmd, cmdstr);
}
/* handle edit cmds: (a)ppend, (i)nsert, and (c)hange */
else if (idx <= IDX_c) { /* a,i,c */
unsigned len;
if (idx < IDX_c) { /* a,i */
if (sed_cmd->end_line || sed_cmd->end_match)
bb_error_msg_and_die("command '%c' uses only one address", sed_cmd->cmd);
}
for (;;) {
if (*cmdstr == '\n' || *cmdstr == '\\') {
cmdstr++;
break;
}
if (!isspace(*cmdstr))
break;
cmdstr++;
}
len = strlen(cmdstr);
sed_cmd->string = copy_parsing_escapes(cmdstr, len);
cmdstr += len;
/* "\anychar" -> "anychar" */
parse_escapes(sed_cmd->string, sed_cmd->string, -1, '\0', '\0');
}
/* handle file cmds: (r)ead */
else if (idx <= IDX_w) { /* r,w */
if (idx < IDX_w) { /* r */
if (sed_cmd->end_line || sed_cmd->end_match)
bb_error_msg_and_die("command '%c' uses only one address", sed_cmd->cmd);
}
cmdstr += parse_file_cmd(/*sed_cmd,*/ cmdstr, &sed_cmd->string);
if (sed_cmd->cmd == 'w') {
sed_cmd->sw_file = xfopen_for_write(sed_cmd->string);
sed_cmd->sw_last_char = '\n';
}
}
/* handle branch commands */
else if (idx <= IDX_T) { /* :,b,t,T */
int length;
cmdstr = skip_whitespace(cmdstr);
length = strcspn(cmdstr, semicolon_whitespace);
if (length) {
sed_cmd->string = xstrndup(cmdstr, length);
cmdstr += length;
}
}
/* translation command */
else if (idx == IDX_y) {
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, -1, i, i);
parse_escapes(replace, replace, -1, 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 (idx >= IDX_nul) { /* not d,D,g,G,h,H,l,n,N,p,P,q,x,=,{,} */
bb_error_msg_and_die("unsupported command %c", sed_cmd->cmd);
}
/* give back whatever's left over */
return cmdstr;
}
/* Parse address+command sets, skipping comment lines. */
static void add_cmd(const char *cmdstr)
{
sed_cmd_t *sed_cmd;
unsigned len, n;
/* 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 line ends with unescaped backslash, request next line. */
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);
sed_cmd->beg_line_orig = sed_cmd->beg_line;
/* second part (if present) will begin with a comma */
if (*cmdstr == ',') {
int idx;
cmdstr++;
if (*cmdstr == '+' && isdigit(cmdstr[1])) {
/* http://sed.sourceforge.net/sedfaq3.html#s3.3
* Under GNU sed 3.02+, ssed, and sed15+, <address2>
* may also be a notation of the form +num,
* indicating the next num lines after <address1> is
* matched.
* GNU sed 4.2.1 accepts even "+" (meaning "+0").
* We don't (we check for isdigit, see above), think
* about the "+-3" case.
*/
char *end;
/* code is smaller compared to using &cmdstr here: */
idx = strtol(cmdstr+1, &end, 10);
sed_cmd->end_line = -2 - idx;
cmdstr = end;
} else {
idx = get_address(cmdstr, &sed_cmd->end_line, &sed_cmd->end_match);
cmdstr += idx;
idx--; /* if 0, trigger error check below */
}
if (idx < 0)
bb_error_msg_and_die("no address after comma");
sed_cmd->end_line_orig = sed_cmd->end_line;
}
/* 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);
/* cmdstr now points past args.
* GNU sed requires a separator, if there are more commands,
* else it complains "char N: extra characters after command".
* Example: "sed 'p;d'". We also allow "sed 'pd'".
*/
/* Add the command to the command array */
*G.sed_cmd_tail = sed_cmd;
G.sed_cmd_tail = &sed_cmd->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;
unsigned match_count = 0;
bool altered = 0;
bool prev_match_empty = 1;
bool tried_at_eol = 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 */
dbg("matching '%s'", line);
if (REG_NOMATCH == regexec(current_regex, line, 10, G.regmatch, 0)) {
dbg("no match");
return 0;
}
dbg("match");
/* 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 start = G.regmatch[0].rm_so;
int end = G.regmatch[0].rm_eo;
int i;
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 < end; i++)
pipe_putc(*line++);
/* Null match? Print one more char */
if (start == end && *line)
pipe_putc(*line++);
goto next;
}
/* Print everything before the match */
for (i = 0; i < start; i++)
pipe_putc(line[i]);
/* Then print the substitution string,
* unless we just matched empty string after non-empty one.
* Example: string "cccd", pattern "c*", repl "R":
* result is "RdR", not "RRdR": first match "ccc",
* second is "" before "d", third is "" after "d".
* Second match is NOT replaced!
*/
if (prev_match_empty || start != 0 || start != end) {
//dbg("%d %d %d", prev_match_empty, start, end);
dbg("inserting replacement at %d in '%s'", start, line);
do_subst_w_backrefs(line, sed_cmd->string);
/* Flag that something has changed */
altered = 1;
} else {
dbg("NOT inserting replacement at %d in '%s'", start, line);
}
/* If matched string is empty (f.e. "c*" pattern),
* copy verbatim one char after it before attempting more matches
*/
prev_match_empty = (start == end);
if (prev_match_empty) {
if (!line[end]) {
tried_at_eol = 1;
} else {
pipe_putc(line[end]);
end++;
}
}
/* Advance past the match */
dbg("line += %d", end);
line += end;
/* if we're not doing this globally, get out now */
if (sed_cmd->which_match != 0)
break;
next:
/* Exit if we are at EOL and already tried matching at it */
if (*line == '\0') {
if (tried_at_eol)
break;
tried_at_eol = 1;
}
//maybe (end ? REG_NOTBOL : 0) instead of unconditional REG_NOTBOL?
} while (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; sed_cmd; sed_cmd = sed_cmd->next) {
if (sed_cmd->cmd == ':'
&& sed_cmd->string
&& strcmp(sed_cmd->string, label) == 0
) {
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, s);
}
/* 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|
*/
enum {
NO_EOL_CHAR = 1,
LAST_IS_NUL = 2,
};
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;
}
static void flush_append(char *last_puts_char)
{
char *data;
/* Output appended lines. */
while ((data = (char *)llist_pop(&G.append_head)) != NULL) {
/* Append command does not respect "nonterminated-ness"
* of last line. Try this:
* $ echo -n "woot" | sed -e '/woot/a woo' -
* woot
* woo
* (both lines are terminated with \n)
* Therefore we do not propagate "last_gets_char" here,
* pass '\n' instead:
*/
puts_maybe_newline(data, G.nonstdout, last_puts_char, '\n');
free(data);
}
}
/* 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.
*/
static char *get_next_line(char *gets_char, char *last_puts_char)
{
char *temp = NULL;
int len;
char gc;
flush_append(last_puts_char);
/* will be returned if last line in the file
* doesn't end with either '\n' or '\0' */
gc = NO_EOL_CHAR;
for (; G.current_input_file <= G.last_input_file; G.current_input_file++) {
FILE *fp = G.current_fp;
if (!fp) {
const char *path = G.input_file_list[G.current_input_file];
fp = stdin;