Implementation status: to be implemented

Synopsis

#include <stdlib.h>

long a64l(const char *s);

Description

Convert a radix-64 ASCII string to a 32-bit long integer.

Arguments:
s - a pointer to a radix-64 representation, in which the first digit is the least significant.

The a64l() function takes a pointer to a radix-64 representation, in which the first digit is the least significant, and returns the corresponding long value. If the string pointed to by s 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. If the type long contains more than 32 bits, the resulting value is sign-extended. The behavior of a64l() is unspecified if s is a null pointer or the string pointed to by s was not generated by a previous call to l64a().

Return value

Upon successful completion, a64l() returns the long value resulting from conversion of the input string. If a string pointed to by s is an empty string, a64l() returns 0L.

Errors

No errors are defined.

Comments

This function 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. If the type long contains more than 32 bits, only the low-order 32 bits shall be used for these operations.
The characters used to represent digits are:
'.' (dot) for 0,
'/' for 1,
'0' through '9' for [2,11],
'A' through 'Z' for [12,37],
'a' through 'z' for [38,63].
So 123 = 59 * 64^0 + 1 * 64^1 = "v/".