- convert between long integer and base-64 ASCII string
#include <stdlib.h> long a64l(const char *s);
char *l64a(long l);
These functions maintain numbers stored in base-64 ASCII characters that define a notation by which long integers can be represented by up to six characters. Each character represents a “digit” in a radix-64 notation.
The characters used to represent “digits” are as follows:
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 l64a() function takes a long argument and returns a pointer to the corresponding base-64 representation. If the argument is 0, l64a() returns a pointer to a null string.
The value returned by l64a() is a pointer into a static buffer, the contents of which are overwritten by each call. In the case of multithreaded applications, the return value is a pointer to thread specific data.
See attributes(5) for descriptions of the following attributes: