1 /*- 2 * Written by J.T. Conklin <jtc@netbsd.org>. 3 * Public domain. 4 */ 5 6 #if 0 7 #if defined(LIBC_SCCS) && !defined(lint) 8 __RCSID("$NetBSD: a64l.c,v 1.8 2000/01/22 22:19:19 mycroft Exp $"); 9 #endif /* not lint */ 10 #endif 11 12 #include <sys/cdefs.h> 13 __FBSDID("$FreeBSD$"); 14 15 #include <stdlib.h> 16 #include <inttypes.h> 17 18 #define ADOT 46 /* ASCII '.' */ 19 #define ASLASH 47 /* ASCII '/' */ 20 #define A0 48 /* ASCII '0' */ 21 #define AA 65 /* ASCII 'A' */ 22 #define Aa 97 /* ASCII 'a' */ 23 24 long 25 a64l(const char *s) 26 { 27 long shift; 28 int digit, i, value; 29 30 value = 0; 31 shift = 0; 32 for (i = 0; *s != '\0' && i < 6; i++, s++) { 33 if (*s <= ASLASH) 34 digit = *s - ASLASH + 1; 35 else if (*s <= A0 + 9) 36 digit = *s - A0 + 2; 37 else if (*s <= AA + 25) 38 digit = *s - AA + 12; 39 else 40 digit = *s - Aa + 38; 41 42 value |= digit << shift; 43 shift += 6; 44 } 45 return (value); 46 } 47