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sed: code shrink

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function                                             old     new   delta
get_next_line                                        246     250      +4
sed_main                                             671     662      -9
add_input_file                                        47       -     -47
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 1/1 up/down: 4/-56)             Total: -52 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2013-11-28 12:08:51 +01:00
parent 259b3c047a
commit deb0769b26
1 changed files with 21 additions and 28 deletions
Download Patch File Download Diff File Expand all files Collapse all files

49
editors/sed.c
View File

@@ -23,9 +23,6 @@
* resulting sed_cmd_t structures are appended to a linked list
* (G.sed_cmd_head/G.sed_cmd_tail).
*
* add_input_file() adds a char* 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.
@@ -141,8 +138,8 @@ struct globals {
smallint exitcode;
/* list of input files */
int input_file_count, current_input_file;
const char **input_file_list;
int current_input_file, last_input_file;
char **input_file_list;
FILE *current_fp;
regmatch_t regmatch[10];
@@ -942,7 +939,7 @@ static char *get_next_line(char *gets_char, char *last_puts_char, char last_gets
/* will be returned if last line in the file
* doesn't end with either '\n' or '\0' */
gc = NO_EOL_CHAR;
for (; G.input_file_list[G.current_input_file]; G.current_input_file++) {
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];
@@ -1414,12 +1411,6 @@ static void add_cmd_block(char *cmdstr)
free(sv);
}
static void add_input_file(const char *file)
{
G.input_file_list = xrealloc_vector(G.input_file_list, 2, G.input_file_count);
G.input_file_list[G.input_file_count++] = file;
}
int sed_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int sed_main(int argc UNUSED_PARAM, char **argv)
{
@@ -1501,36 +1492,38 @@ int sed_main(int argc UNUSED_PARAM, char **argv)
/* 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[0] == NULL) {
G.input_file_list = argv;
if (!argv[0]) {
if (opt & OPT_in_place)
bb_error_msg_and_die(bb_msg_requires_arg, "-i");
add_input_file(bb_msg_standard_input);
argv[0] = (char*)bb_msg_standard_input;
/* G.last_input_file = 0; - already is */
} else {
int i;
goto start;
for (i = 0; argv[i]; i++) {
for (; *argv; argv++) {
struct stat statbuf;
int nonstdoutfd;
sed_cmd_t *sed_cmd;
if (LONE_DASH(argv[i]) && !(opt & OPT_in_place)) {
add_input_file(bb_msg_standard_input);
process_files();
continue;
}
add_input_file(argv[i]);
G.last_input_file++;
start:
if (!(opt & OPT_in_place)) {
if (LONE_DASH(*argv)) {
*argv = (char*)bb_msg_standard_input;
process_files();
}
continue;
}
/* -i: process each FILE separately: */
G.outname = xasprintf("%sXXXXXX", argv[i]);
G.outname = xasprintf("%sXXXXXX", *argv);
nonstdoutfd = xmkstemp(G.outname);
G.nonstdout = xfdopen_for_write(nonstdoutfd);
/* Set permissions/owner of output file */
stat(argv[i], &statbuf);
stat(*argv, &statbuf);
/* chmod'ing AFTER chown would preserve suid/sgid bits,
* but GNU sed 4.2.1 does not preserve them either */
fchmod(nonstdoutfd, statbuf.st_mode);
@@ -1541,12 +1534,12 @@ int sed_main(int argc UNUSED_PARAM, char **argv)
G.nonstdout = stdout;
if (opt_i) {
char *backupname = xasprintf("%s%s", argv[i], opt_i);
xrename(argv[i], backupname);
char *backupname = xasprintf("%s%s", *argv, opt_i);
xrename(*argv, backupname);
free(backupname);
}
/* else unlink(argv[i]); - rename below does this */
xrename(G.outname, argv[i]); //TODO: rollback backup on error?
/* else unlink(*argv); - rename below does this */
xrename(G.outname, *argv); //TODO: rollback backup on error?
free(G.outname);
G.outname = NULL;