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*: use better isspace implementation

Browse Source 
function                                             old     new   delta
asciifile                                             90     106     +16
expand                                               653     658      +5
skip_non_whitespace                                   21      25      +4
bb_iswspace                                           25      28      +3
readcmd                                             1071    1072      +1
find_range                                           496     497      +1
singlemount                                          772     771      -1
ifupdown_main                                       2134    2133      -1
edir                                                 370     369      -1
volume_id_set_label_string                            82      79      -3
trim                                                  85      82      -3
rtc_adjtime_is_utc                                   141     138      -3
rewrite                                             1039    1036      -3
do_cmd                                              4465    4462      -3
bb_dump_add                                          358     355      -3
awk_split                                            553     550      -3
fbset_main                                          1273    1268      -5
skip_thing                                           259     253      -6
get_trimmed_slice                                     46      39      -7
bb__parsegrent                                       245     238      -7
parse_file_cmd                                       116     108      -8
check                                               1532    1523      -9
bb__pgsreader                                        198     188     -10
dot_skip_over_ws                                      61      46     -15
colon                                               3032    3012     -20
if_readlist_proc                                     655     634     -21
normalize                                            193     165     -28
add_cmd                                             1162    1133     -29
get_key                                              528     476     -52
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 6/23 up/down: 30/-241)         Total: -211 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2009-10-22 19:41:45 +02:00
parent 46e364dbfe
commit f125b6d341
2 changed files with 20 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
include/libbb.h
View File

@ -1576,7 +1576,6 @@ extern const char bb_default_login_shell[];
#undef islower
#undef isprint
#undef ispunct
#undef isspace
#undef isupper
#undef isxdigit
@ -1584,6 +1583,16 @@ extern const char bb_default_login_shell[];
#undef isdigit
#define isdigit(a) ((unsigned)((a) - '0') <= 9)
/* This one is more efficient too! ~200 bytes */
/* In POSIX/C locale (the only locale we care about: do we REALLY want
* to allow Unicode whitespace in, say, .conf files? nuts!)
* isspace is only these chars: "\t\n\v\f\r" and space.
* "\t\n\v\f\r" happen to have ASCII codes 9,10,11,12,13.
* Use that.
*/
#undef isspace
#define isspace(a) ({ unsigned char bb__isspace = (a) - 9; bb__isspace == (' ' - 9) || bb__isspace <= (13 - 9); })
#define ARRAY_SIZE(x) ((unsigned)(sizeof(x) / sizeof((x)[0])))

13
libbb/skip_whitespace.c
View File

@ -11,15 +11,22 @@
char* FAST_FUNC skip_whitespace(const char *s)
{
/* NB: isspace('\0') returns 0 */
while (isspace(*s)) ++s;
/* In POSIX/C locale (the only locale we care about: do we REALLY want
* to allow Unicode whitespace in, say, .conf files? nuts!)
* isspace is only these chars: "\t\n\v\f\r" and space.
* "\t\n\v\f\r" happen to have ASCII codes 9,10,11,12,13.
* Use that.
*/
while (*s == ' ' || (unsigned char)(*s - 9) <= (13 - 9))
s++;
return (char *) s;
}
char* FAST_FUNC skip_non_whitespace(const char *s)
{
while (*s && !isspace(*s)) ++s;
while (*s != '\0' && *s != ' ' && (unsigned char)(*s - 9) > (13 - 9))
s++;
return (char *) s;
}