stdlib/a64l.c

   1 /*
   2  * Written by J.T. Conklin <jtc@netbsd.org>.
   3  * Public domain.
   4  */
   5
   6 #if defined(LIBC_SCCS) && !defined(lint)
   7 static char *rcsid = "$OpenBSD: a64l.c,v 1.3 1997/08/17 22:58:34 millert Exp $";
   8 #endif /* LIBC_SCCS and not lint */
   9
  10 #include <errno.h>
  11 #include <stdlib.h>
  12
  13 long
  14 a64l(s)
  15         const char *s;
  16 {
  17         int value, digit, shift;
  18         int i;
  19
  20         if (s == NULL) {
  21                 errno = EINVAL;
  22                 return(-1L);
  23         }
  24
  25         value = 0;
  26         shift = 0;
  27         for (i = 0; *s && i < 6; i++, s++) {
  28                 if (*s >= '.' && *s <= '/')
  29                         digit = *s - '.';
  30                 else if (*s >= '0' && *s <= '9')
  31                         digit = *s - '0' + 2;
  32                 else if (*s >= 'A' && *s <= 'Z')
  33                         digit = *s - 'A' + 12;
  34                 else if (*s >= 'a' && *s <= 'z')
  35                         digit = *s - 'a' + 38;
  36                 else {
  37                         errno = EINVAL;
  38                         return(-1L);
  39                 }
  40
  41                 value |= digit << shift;
  42                 shift += 6;
  43         }
  44
  45         return(value);
  46 }
  47