From: Denys Vlasenko Date: Thu, 22 Oct 2009 17:41:45 +0000 (+0200) Subject: *: use better isspace implementation X-Git-Tag: 1_16_0~337 X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=f125b6d341b06fda5412b82d23e486100e107eaa;p=oweals%2Fbusybox.git *: use better isspace implementation 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 --- diff --git a/include/libbb.h b/include/libbb.h index 97dbe8687..fb7296f25 100644 --- a/include/libbb.h +++ b/include/libbb.h @@ -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]))) diff --git a/libbb/skip_whitespace.c b/libbb/skip_whitespace.c index e85f3859f..7b123261b 100644 --- a/libbb/skip_whitespace.c +++ b/libbb/skip_whitespace.c @@ -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; }