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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [stdlib/] [l64a.c] - Rev 214
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/* l64a - convert long to radix-64 ascii string * * Conversion is performed on at most 32-bits of input value starting * from least significant bits to the most significant bits. * * The routine splits the input value into groups of 6 bits for up to * 32 bits of input. This means that the last group may be 2 bits * (bits 30 and 31). * * Each group of 6 bits forms a value from 0-63 which is converted into * a character as follows: * 0 = '.' * 1 = '/' * 2-11 = '0' to '9' * 12-37 = 'A' to 'Z' * 38-63 = 'a' to 'z' * * When the remaining bits are zero or all 32 bits have been translated, * a nul terminator is appended to the resulting string. An input value of * 0 results in an empty string. */ #include <_ansi.h> #include <stdlib.h> #include <reent.h> static const char R64_ARRAY[] = "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; char * _DEFUN (l64a, (value), long value) { return _l64a_r (_REENT, value); } char * _DEFUN (_l64a_r, (rptr, value), struct _reent *rptr _AND long value) { char *ptr; char *result; int i, index; unsigned long tmp = (unsigned long)value & 0xffffffff; _REENT_CHECK_MISC(rptr); result = _REENT_L64A_BUF(rptr); ptr = result; for (i = 0; i < 6; ++i) { if (tmp == 0) { *ptr = '\0'; break; } index = tmp & (64 - 1); *ptr++ = R64_ARRAY[index]; tmp >>= 6; } return result; }
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