#include <stdlib.h>
long a64l(const char *s);
char *l64a(long value);
The a64l() and l64a()
functions are used to maintain numbers stored in radix-64 ASCII
characters. This is a notation by which 32-bit integers can be
represented by up to six characters; each character represents a
digit in radix-64 notation. The characters used to represent
digits are '.' for 0, '/' for
1, '0' through
'9' for 2-11, 'A'
through 'Z' for 12-37, and 'a'
through 'z' for 38-63.
The a64l() function
takes a pointer to a radix-64 representation, in which the first
digit is the least significant, and returns a corresponding long
value. If the string contains more than
six characters, a64l() uses the first six. If the first
six characters of the string contain a null terminator,
a64l() uses only characters preceding the null terminator.
The a64l() function scans the character string from
left to right with the least significant digit on the left, decoding each
character as a 6-bit radix-64 number. The behavior of
a64l() is unspecified if the specified pointer is null
or the string was not generated by a previous call to
l64a().
The l64a() function takes a long
argument and returns a pointer to the corresponding radix-64
representation. The behavior of l64a() is unspecified if
the specified value is negative.
- s
-
Points to a string containing an encoded radix-64 number.
- value
-
A number to be encoded into radix-64.
On success, a64l() returns the long
value resulting from conversion of the
input string. If the string is an empty string, a64l()
returns 0.
On success, l64a() returns a pointer to the radix-64
representation. If value is 0, l64a()
returns a pointer to an empty string. The
pointer returned by l64a() refers to a static buffer.
Subsequent calls to l64a() overwrite this buffer.
UNIX 98.
a64l(): MT-Safe.
l64a(): Unsafe.
None.
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