| 1 | /* $Id: kHlpInt2Ascii.c 3573 2007-08-31 04:09:23Z bird $ */
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| 2 | /** @file
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| 3 | * kHlpString - kHlpInt2Ascii.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (c) 2006-2007 knut st. osmundsen <bird-src-spam@anduin.net>
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| 8 | *
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| 9 | * This file is part of kStuff.
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| 10 | *
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| 11 | * kStuff is free software; you can redistribute it and/or
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| 12 | * modify it under the terms of the GNU Lesser General Public
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| 13 | * License as published by the Free Software Foundation; either
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| 14 | * version 2.1 of the License, or (at your option) any later version.
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| 15 | *
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| 16 | * kStuff is distributed in the hope that it will be useful,
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| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 19 | * Lesser General Public License for more details.
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| 20 | *
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| 21 | * You should have received a copy of the GNU Lesser General Public
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| 22 | * License along with kStuff; if not, write to the Free Software
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| 23 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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| 24 | *
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| 25 | */
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| 26 |
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| 27 | /*******************************************************************************
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| 28 | * Header Files *
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| 29 | *******************************************************************************/
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| 30 | #include <k/kHlpString.h>
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| 31 |
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| 32 |
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| 33 | /**
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| 34 | * Converts an signed integer to an ascii string.
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| 35 | *
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| 36 | * @returns psz.
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| 37 | * @param psz Pointer to the output buffer.
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| 38 | * @param cch The size of the output buffer.
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| 39 | * @param lVal The value.
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| 40 | * @param iBase The base to format it. (2,8,10 or 16)
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| 41 | */
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| 42 | KHLP_DECL(char *) kHlpInt2Ascii(char *psz, KSIZE cch, long lVal, unsigned iBase)
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| 43 | {
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| 44 | static const char s_szDigits[] = "0123456789abcdefghijklmnopqrstuvwxyz";
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| 45 | char *pszRet = psz;
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| 46 |
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| 47 | if (cch >= (lVal < 0 ? 3U : 2U) && psz)
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| 48 | {
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| 49 | /* prefix */
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| 50 | if (lVal < 0)
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| 51 | {
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| 52 | *psz++ = '-';
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| 53 | cch--;
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| 54 | lVal = -lVal;
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| 55 | }
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| 56 |
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| 57 | /* the digits */
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| 58 | do
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| 59 | {
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| 60 | *psz++ = s_szDigits[lVal % iBase];
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| 61 | cch--;
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| 62 | lVal /= iBase;
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| 63 | } while (lVal && cch > 1);
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| 64 |
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| 65 | /* overflow indicator */
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| 66 | if (lVal)
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| 67 | psz[-1] = '+';
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| 68 | }
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| 69 | else if (!pszRet)
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| 70 | return pszRet;
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| 71 | else if (cch < 1 || !pszRet)
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| 72 | return pszRet;
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| 73 | else
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| 74 | *psz++ = '+';
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| 75 | *psz = '\0';
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| 76 |
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| 77 | return pszRet;
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| 78 | }
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| 79 |
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