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fix isalnum and isxdigit. Unfortunately, +285 bytes

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2009-10-23 13:57:24 +02:00
parent a7a1fd02cb
commit 11c12c4720
1 changed files with 22 additions and 2 deletions
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24
include/libbb.h
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@ -1601,8 +1601,28 @@ extern const char bb_default_login_shell[];
* "\t\n\v\f\r" happen to have ASCII codes 9,10,11,12,13.
*/
#define isspace(a) ({ unsigned char bb__isspace = (a) - 9; bb__isspace == (' ' - 9) || bb__isspace <= (13 - 9); })
#define isalnum(a) ({ unsigned char bb__isalnum = ((a)|0x20) - '0'; bb__isalnum <= 9 || (bb__isalnum - ('a' - '0')) <= 25; })
#define isxdigit(a) ({ unsigned char bb__isxdigit = ((a)|0x20) - '0'; bb__isxdigit <= 9 || (bb__isxdigit - ('a' - '0')) <= 5; })
// Bigger code:
//#define isalnum(a) ({ unsigned char bb__isalnum = (a) - '0'; bb__isalnum <= 9 || ((bb__isalnum - ('A' - '0')) & 0xdf) <= 25; }) */
#define isalnum(a) bb_ascii_isalnum(a)
static ALWAYS_INLINE int bb_ascii_isalnum(unsigned char a)
{
unsigned char b = a - '0';
if (b <= 9)
return (b <= 9);
b = (a|0x20) - 'a';
return b <= 'z' - 'a';
}
#define isxdigit(a) bb_ascii_isxdigit(a)
static ALWAYS_INLINE int bb_ascii_isxdigit(unsigned char a)
{
unsigned char b = a - '0';
if (b <= 9)
return (b <= 9);
b = (a|0x20) - 'a';
return b <= 'f' - 'a';
}
// Unsafe wrt NUL!
//#define ispunct(a) (strchr("!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~", (a)) != NULL)
#define ispunct(a) (strchrnul("!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~", (a))[0])