diff options
Diffstat (limited to 'stdlib/a64l.c')
| -rw-r--r-- | stdlib/a64l.c | 57 |
1 files changed, 34 insertions, 23 deletions
diff --git a/stdlib/a64l.c b/stdlib/a64l.c index d1dd3a9b6b..eb1eef5cbf 100644 --- a/stdlib/a64l.c +++ b/stdlib/a64l.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1995, 1997 Free Software Foundation, Inc. +/* Copyright (C) 1995, 1997, 1998 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995. @@ -19,36 +19,47 @@ #include <stdlib.h> +#define TABLE_BASE 0x20 +#define TABLE_SIZE 0x60 + +#define XX ((char)0x40) + + +static const char a64l_table[TABLE_SIZE] = +{ + /* 0x20 */ XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, 0, 1, + /* 0x30 */ 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, XX, XX, XX, XX, XX, XX, + /* 0x40 */ XX, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, + /* 0x50 */ 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, XX, XX, XX, XX, XX, + /* 0x60 */ XX, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, + /* 0x70 */ 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, XX, XX, XX, XX, XX +}; + + long int a64l (string) const char *string; { - size_t cnt; - unsigned long int result = 0l; + const char *ptr = string; + unsigned long int result = 0ul; + const char *end = ptr + 6; - for (cnt = 0; cnt < 6; ++cnt) + do { + unsigned index; + unsigned value; + + index = *ptr - TABLE_BASE; + if ((unsigned int) index >= TABLE_SIZE) + break; + value = (int) a64l_table[index]; + if (value == (int) XX) + break; result <<= 6; - switch (string[cnt]) - { - case '.': - break; - case '/': - result |= 1; - break; - case '0' ... '9': - result |= 2 + string[cnt] - '0'; - break; - case 'A' ... 'Z': - result |= 12 + string[cnt] - 'A'; - break; - case 'a' ... 'z': - result |= 38 + string[cnt] - 'a'; - break; - default: - return result >> 6; - } + ++ptr; + result |= value; } + while (ptr != end); return (long int) result; } |