Avoid some aliasing violations in libio
[glibc.git] / stdlib / l64a.c
blob379e1f896e82019ed9436ea705f6bbb8615950b2
1 /* Copyright (C) 1995-2015 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
19 #include <stdlib.h>
21 /* Conversion table. */
22 static const char conv_table[64] =
24 '.', '/', '0', '1', '2', '3', '4', '5',
25 '6', '7', '8', '9', 'A', 'B', 'C', 'D',
26 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L',
27 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T',
28 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b',
29 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j',
30 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r',
31 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'
34 char *
35 l64a (n)
36 long int n;
38 unsigned long int m = (unsigned long int) n;
39 static char result[7];
40 int cnt;
42 /* The standard says that only 32 bits are used. */
43 m &= 0xffffffff;
45 if (m == 0ul)
46 /* The value for N == 0 is defined to be the empty string. */
47 return (char *) "";
49 for (cnt = 0; m > 0ul; ++cnt)
51 result[cnt] = conv_table[m & 0x3f];
52 m >>= 6;
54 result[cnt] = '\0';
56 return result;