diff options
Diffstat (limited to 'newlib/libc/stdlib/a64l.c')
| -rw-r--r-- | newlib/libc/stdlib/a64l.c | 55 |
1 files changed, 25 insertions, 30 deletions
diff --git a/newlib/libc/stdlib/a64l.c b/newlib/libc/stdlib/a64l.c index 42fc2d2fa..93c8e834b 100644 --- a/newlib/libc/stdlib/a64l.c +++ b/newlib/libc/stdlib/a64l.c @@ -1,6 +1,6 @@ /* FUNCTION -<<a64l>>, <<l64a>>---convert between radix-64 ASCII string and long +<<a64l>>,<<l64a>>---convert between radix-64 ascii string and long INDEX a64l @@ -21,36 +21,31 @@ TRAD_SYNOPSIS long <[input]>; DESCRIPTION -Conversion is performed between long and radix-64 characters. The -<<l64a>> routine transforms up to 32 bits of input value starting from -least significant bits to the most significant bits. The input value -is split up into a maximum of 5 groups of 6 bits and possibly one -group of 2 bits (bits 31 and 30). - -Each group of 6 bits forms a value from 0--63 which is translated into -a character as follows: - -O+ -o 0 = '.' -o 1 = '/' -o 2--11 = '0' to '9' -o 12--37 = 'A' to 'Z' -o 38--63 = 'a' to 'z' -O- - -When the remaining bits are zero or all bits have been translated, a -null terminator is appended to the string. An input value of 0 -results in the empty string. - -The <<a64l>> function performs the reverse translation. Each -character is used to generate a 6-bit value for up to 30 bits and then -a 2-bit value to complete a 32-bit result. The null terminator means -that the remaining digits are 0. An empty input string or NULL string -results in 0L. An invalid string results in undefined behavior. If -the size of a long is greater than 32 bits, the result is sign-extended. - +Conversion is performed between long and radix-64 characters. The <<l64a>> routine +transforms up to 32-bits of input value starting from least significant bits to +the most significant bits. The input value is split up into a maximum of 5 +groups of 6-bits and possibly one group of 2 bits (bits 31 and 30). + +Each group of 6 bits forms a value from 0-63 which is translated into a character +as follows: + + 0 = '.' + 1 = '/' + 2-11 = '0' to '9' + 12-37 = 'A' to 'Z' + 38-63 = 'a' to 'z' + +When remaining bits are zero or all bits have been translated, a nul terminator +is appended to the string. An input value of 0 results in the empty string. + +The <<a64l>> performs the reverse translation. Each character is used to generate +a 6-bit value for up to 30 bits and then a 2-bit value to complete a 32-bit result. +The nul terminator means that the remaining digits are 0. An empty input string or +NULL string results in 0L. An invalid string results in undefined behavior. +If the size of a long is > 32 bits, the result is sign-extended. + RETURNS -<<l64a>> returns a null-terminated string of 0 to 6 characters. +<<l64a>> returns a nul-terminated string of 0 to 6 characters. <<a64l>> returns the 32-bit translated value from the input character string. PORTABILITY |