82 lines
1.7 KiB
C
82 lines
1.7 KiB
C
/*
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* convert unsigned long to text
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* Copyright (C) 2000 Henry Spencer.
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*
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* This library is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Library General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/lgpl.txt>.
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*
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* This library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
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* License for more details.
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*/
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#include "internal.h"
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#include "freeswan.h"
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/*
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- ultot - convert unsigned long to text
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*/
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size_t /* length required for full conversion */
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ultot(n, base, dst, dstlen)
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unsigned long n;
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int base;
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char *dst; /* need not be valid if dstlen is 0 */
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size_t dstlen;
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{
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char buf[3*sizeof(unsigned long) + 1];
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char *bufend = buf + sizeof(buf);
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size_t len;
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char *p;
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static char hex[] = "0123456789abcdef";
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# define HEX32 (32/4)
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p = bufend;
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*--p = '\0';
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switch (base) {
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case 10:
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case 'd':
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do {
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*--p = n%10 + '0';
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n /= 10;
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} while (n != 0);
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break;
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case 16:
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case 17:
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case 'x':
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do {
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*--p = hex[n&0xf];
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n >>= 4;
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} while (n != 0);
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if (base == 17)
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while (bufend - p < HEX32 + 1)
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*--p = '0';
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if (base == 'x') {
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*--p = 'x';
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*--p = '0';
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}
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break;
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case 8:
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case 'o':
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do {
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*--p = (n&07) + '0';
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n >>= 3;
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} while (n != 0);
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if (base == 'o')
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*--p = '0';
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break;
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default:
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return 0;
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break;
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}
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len = bufend - p;
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if (dstlen > 0) {
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if (len > dstlen)
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*(p + dstlen - 1) = '\0';
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strcpy(dst, p);
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}
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return len;
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}
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