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[core] more efficient hex2int()

This commit is contained in:
Glenn Strauss 2018-04-14 17:17:19 -04:00
parent 936db51f05
commit 9eda625d67
1 changed files with 10 additions and 10 deletions
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20
src/buffer.c
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@ -357,23 +357,23 @@ void li_utostrn(char *buf, size_t buf_len, uintmax_t val) {
memcpy(buf, str, p_buf_end - str);
}
#define li_ntox_lc(n) ((n) <= 9 ? (n) + '0' : (n) + 'a' - 10)
char int2hex(char c) {
return hex_chars[(c & 0x0F)];
/*return li_ntox_lc(c & 0xF);*/
return hex_chars_lc[(c & 0x0F)];
}
/* c (char) and n (nibble) MUST be unsigned integer types */
#define li_cton(c,n) \
(((n) = (c) - '0') <= 9 || (((n) = ((c)&0xdf) - 'A') <= 5 ? ((n) += 10) : 0))
/* converts hex char (0-9, A-Z, a-z) to decimal.
* returns 0xFF on invalid input.
*/
char hex2int(unsigned char hex) {
unsigned char value = hex - '0';
if (value > 9) {
hex |= 0x20; /* to lower case */
value = hex - 'a' + 10;
if (value < 10) value = 0xff;
}
if (value > 15) value = 0xff;
return value;
unsigned char n;
return li_cton(hex,n) ? (char)n : 0xFF;
}
/**