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*: optimize most of isXXXXX() macros

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text    data     bss     dec     hex filename
 824164     453    6812  831429   cafc5 busybox_old
 823730     453    6812  830995   cae13 busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2009-10-23 03:16:08 +02:00
parent 7b4cd6f7b0
commit f2cbb03a37
7 changed files with 33 additions and 23 deletions
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22
include/libbb.h
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@ -1566,8 +1566,11 @@ extern const char bb_default_login_shell[];
#define RB_POWER_OFF 0x4321fedc
#endif
/* Make sure we call functions instead of macros. */
/* Make sure we call functions instead of these macros */
#undef isalnum
#undef ispunct
#undef isxdigit
/* and these we'll redefine */
#undef isalpha
#undef isascii
#undef isblank
@ -1575,25 +1578,32 @@ extern const char bb_default_login_shell[];
#undef isgraph
#undef islower
#undef isprint
#undef ispunct
#undef isupper
#undef isxdigit
#undef isdigit
#undef isspace
/* This one is more efficient - we save ~500 bytes.
* BTW, x86 likes (unsigned char) cast more than (unsigned). */
#undef isdigit
#define isdigit(a) ((unsigned char)((a) - '0') <= 9)
/* This one is more efficient too! ~200 bytes */
#define isascii(a) ((unsigned char)(a) <= 0x7f)
#define isgraph(a) ((unsigned char)(a) > ' ')
#define isprint(a) ((unsigned char)(a) >= ' ')
#define isupper(a) ((unsigned char)((a) - 'A') <= ('Z' - 'A'))
#define islower(a) ((unsigned char)((a) - 'a') <= ('z' - 'a'))
#define isalpha(a) ((unsigned char)(((a) | 0x20) - 'a') <= ('z' - 'a'))
#define isblank(a) ({ unsigned char bb__isblank = (a); bb__isblank == ' ' || bb__isblank == '\t'; })
#define iscntrl(a) ({ unsigned char bb__iscntrl = (a); bb__iscntrl < ' ' || bb__iscntrl == 0x7f; })
/* 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])))