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sed: fix range handling for sed -i. Closes 4069

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function                                             old     new   delta
sed_main                                             606     618     +12
add_cmd                                             1099    1101      +2
process_files                                       2108    2099      -9
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/1 up/down: 14/-9)               Total: 5 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2011-08-16 13:29:34 +02:00
parent 4f54168ea2
commit a7d6bb3b5d
2 changed files with 58 additions and 31 deletions
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79
editors/sed.c
View File

@ -75,6 +75,13 @@
#include "libbb.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,
};
@ -89,6 +96,7 @@ typedef struct sed_cmd_s {
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 ($) */
FILE *sw_file; /* File (sw) command writes to, -1 for none. */
@ -123,7 +131,7 @@ struct globals {
regex_t *previous_regex_ptr;
/* linked list of sed commands */
sed_cmd_t sed_cmd_head, *sed_cmd_tail;
sed_cmd_t *sed_cmd_head, **sed_cmd_tail;
/* Linked list of append lines */
llist_t *append_head;
@ -148,7 +156,7 @@ struct BUG_G_too_big {
#if ENABLE_FEATURE_CLEAN_UP
static void sed_free_and_close_stuff(void)
{
sed_cmd_t *sed_cmd = G.sed_cmd_head.next;
sed_cmd_t *sed_cmd = G.sed_cmd_head;
llist_free(G.append_head, free);
@ -599,6 +607,7 @@ static void add_cmd(const char *cmdstr)
/* first part (if present) is an address: either a '$', a number or a /regex/ */
cmdstr += get_address(cmdstr, &sed_cmd->beg_line, &sed_cmd->beg_match);
sed_cmd->beg_line_orig = sed_cmd->beg_line;
/* second part (if present) will begin with a comma */
if (*cmdstr == ',') {
@ -630,8 +639,8 @@ static void add_cmd(const char *cmdstr)
cmdstr = parse_cmd_args(sed_cmd, cmdstr);
/* Add the command to the command array */
G.sed_cmd_tail->next = sed_cmd;
G.sed_cmd_tail = G.sed_cmd_tail->next;
*G.sed_cmd_tail = sed_cmd;
G.sed_cmd_tail = &sed_cmd->next;
}
/* If we glued multiple lines together, free the memory. */
@ -777,7 +786,7 @@ static sed_cmd_t *branch_to(char *label)
{
sed_cmd_t *sed_cmd;
for (sed_cmd = G.sed_cmd_head.next; sed_cmd; sed_cmd = sed_cmd->next) {
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)) {
return sed_cmd;
}
@ -953,24 +962,24 @@ static void process_files(void)
/* For every line, go through all the commands */
restart:
for (sed_cmd = G.sed_cmd_head.next; sed_cmd; sed_cmd = sed_cmd->next) {
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: */
//bb_error_msg("match1:%d", sed_cmd->in_match);
//bb_error_msg("match2:%d", (!sed_cmd->beg_line && !sed_cmd->end_line
// && !sed_cmd->beg_match && !sed_cmd->end_match));
//bb_error_msg("match3:%d", (sed_cmd->beg_line > 0
// && (sed_cmd->end_line || sed_cmd->end_match
// ? (sed_cmd->beg_line <= linenum)
// : (sed_cmd->beg_line == linenum)
// )
// )
//bb_error_msg("match4:%d", (beg_match(sed_cmd, pattern_space)));
//bb_error_msg("match5:%d", (sed_cmd->beg_line == -1 && next_line == NULL));
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
@ -981,7 +990,14 @@ static void process_files(void)
|| (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 */
* 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 */
)
@ -994,16 +1010,14 @@ static void process_files(void)
/* Snapshot the value */
matched = sed_cmd->in_match;
//bb_error_msg("cmd:'%c' matched:%d beg_line:%d end_line:%d linenum:%d",
//sed_cmd->cmd, matched, sed_cmd->beg_line, sed_cmd->end_line, linenum);
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) {
/* once matched, "n,xxx" range is dead, disabling it */
if (sed_cmd->beg_line > 0
&& !(option_mask32 & OPT_in_place) /* but not for -i */
) {
if (sed_cmd->beg_line > 0) {
sed_cmd->beg_line = -2;
}
sed_cmd->in_match = !(
@ -1017,7 +1031,8 @@ static void process_files(void)
/* 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))
pattern_space, 0, NULL, 0) == 0)
)
);
}
@ -1407,11 +1422,12 @@ int sed_main(int argc UNUSED_PARAM, char **argv)
add_input_file(stdin);
} else {
int i;
FILE *file;
for (i = 0; argv[i]; i++) {
struct stat statbuf;
int nonstdoutfd;
FILE *file;
sed_cmd_t *sed_cmd;
if (LONE_DASH(argv[i]) && !(opt & OPT_in_place)) {
add_input_file(stdin);
@ -1423,11 +1439,13 @@ int sed_main(int argc UNUSED_PARAM, char **argv)
status = EXIT_FAILURE;
continue;
}
add_input_file(file);
if (!(opt & OPT_in_place)) {
add_input_file(file);
continue;
}
/* -i: process each FILE separately: */
G.outname = xasprintf("%sXXXXXX", argv[i]);
nonstdoutfd = xmkstemp(G.outname);
G.nonstdout = xfdopen_for_write(nonstdoutfd);
@ -1438,15 +1456,20 @@ int sed_main(int argc UNUSED_PARAM, char **argv)
* but GNU sed 4.2.1 does not preserve them either */
fchmod(nonstdoutfd, statbuf.st_mode);
fchown(nonstdoutfd, statbuf.st_uid, statbuf.st_gid);
add_input_file(file);
process_files();
fclose(G.nonstdout);
G.nonstdout = stdout;
/* unlink(argv[i]); */
xrename(G.outname, argv[i]);
free(G.outname);
G.outname = NULL;
/* Re-enable disabled range matches */
for (sed_cmd = G.sed_cmd_head; sed_cmd; sed_cmd = sed_cmd->next) {
sed_cmd->beg_line = sed_cmd->beg_line_orig;
}
}
/* Here, to handle "sed 'cmds' nonexistent_file" case we did:
* if (G.current_input_file >= G.input_file_count)

10
testsuite/sed.tests
View File

@ -6,7 +6,7 @@
. ./testing.sh
# testing "description" "arguments" "result" "infile" "stdin"
# testing "description" "commands" "result" "infile" "stdin"
# Corner cases
testing "sed no files (stdin)" 'sed ""' "hello\n" "" "hello\n"
@ -225,7 +225,7 @@ testing "sed s/xxx/[/" "sed -e 's/xxx/[/'" "[\n" "" "xxx\n"
#testing "sed -g (exhaustive)" "sed -e 's/[[:space:]]*/,/g'" ",1,2,3,4,5," \
# "" "12345"
# testing "description" "arguments" "result" "infile" "stdin"
# testing "description" "commands" "result" "infile" "stdin"
testing "sed n command must reset 'substituted' bit" \
"sed 's/1/x/;T;n;: next;s/3/y/;t quit;n;b next;: quit;q'" \
@ -291,6 +291,10 @@ testing "sed understands \r" \
"sed 's/r/\r/'" \
"\rrr\n" "" "rrr\n"
# testing "description" "arguments" "result" "infile" "stdin"
testing "sed -i finishes ranges correctly" \
"sed '1,2d' -i input; echo \$?; cat input" \
"0\n3\n4\n" "1\n2\n3\n4\n" ""
# testing "description" "commands" "result" "infile" "stdin"
exit $FAILCOUNT