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, &last_puts_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, &last_puts_char);
linenum++;
/* For every line, go through all the commands */
restart:
for (sed_cmd = G.sed_cmd_head; sed_cmd; sed_cmd = sed_cmd->next) {
int old_matched, matched;
old_matched = sed_cmd->in_match;
/* Determine if this command matches this line: */
dbg("match1:%d", sed_cmd->in_match);
dbg("match2:%d", (!sed_cmd->beg_line && !sed_cmd->end_line
&& !sed_cmd->beg_match && !sed_cmd->end_match));
dbg("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)
)
));
dbg("match4:%d", (beg_match(sed_cmd, pattern_space)));
dbg("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, therefore we don't
* check here that linenum <= end.
* Example:
* printf '1\n2\n3\n4\n' | sed -n '1{N;N;d};1p;2,3p;3p;4p'
* first three input lines are deleted;
* 4th line is matched and printed
* by "2,3" (!) and by "4" ranges
*/
? (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;
dbg("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) {
if (sed_cmd->end_line <= -2) {
/* address2 is +N, i.e. N lines from beg_line */
sed_cmd->end_line = linenum + (-sed_cmd->end_line - 2);
}
/* once matched, "n,xxx" range is dead, disabling it */
if (sed_cmd->beg_line > 0) {
sed_cmd->beg_line = -2;
}
dbg("end1:%d", sed_cmd->end_line ? sed_cmd->end_line == -1
? !next_line : (sed_cmd->end_line <= linenum)
: !sed_cmd->end_match);
dbg("end2:%d", sed_cmd->end_match && old_matched
&& !regexec(sed_cmd->end_match,pattern_space, 0, NULL, 0));
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 */
dbg("pattern_space:'%s' next_line:'%s' cmd:%c",
pattern_space, next_line, sed_cmd->cmd);
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;
dbg("do_subst_command succeeded:'%s'", pattern_space);
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(xstrdup(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);
fclose(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 == NULL) {
/* If no next line, jump to end of script and exit. */
goto discard_line;
}
free(pattern_space);
pattern_space = next_line;
last_gets_char = next_gets_char;
next_line = get_next_line(&next_gets_char, &last_puts_char);
substituted = 0;
linenum++;
break;
/* 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. */
/* http://www.gnu.org/software/sed/manual/sed.html:
* "Most versions of sed exit without printing anything
* when the N command is issued on the last line of
* a file. GNU sed prints pattern space before exiting
* unless of course the -n command switch has been
* specified. This choice is by design."
*/
if (next_line == NULL) {
//goto discard_line;
goto discard_commands; /* GNU behavior */
}
/* 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, &last_puts_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(&last_puts_char /*,last_gets_char*/);
free(pattern_space);
goto again;
}
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 {");
}
}
continue;
}
/* 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;
}
/* 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) {
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);
}
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;
}
/* 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 ? : 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;
}
