| 1 | /* $Id: kHlpGetEnvUZ.c 3575 2007-09-02 20:05:39Z bird $ */
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| 2 | /** @file
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| 3 | * kHlpEnv - kHlpGetEnvUZ.
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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/kHlpEnv.h>
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| 31 | #include <k/kHlpString.h>
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| 32 |
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| 33 |
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| 34 | /**
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| 35 | * Gets an environment variable and converts it to a KSIZE.
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| 36 | *
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| 37 | * @returns 0 and *pcb on success.
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| 38 | * @returns On failure see kHlpGetEnv.
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| 39 | * @param pszVar The name of the variable.
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| 40 | * @param pcb Where to put the value.
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| 41 | */
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| 42 | KHLP_DECL(int) kHlpGetEnvUZ(const char *pszVar, KSIZE *pcb)
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| 43 | {
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| 44 | KSIZE cb;
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| 45 | unsigned uBase;
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| 46 | char szVal[64];
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| 47 | KSIZE cchVal = sizeof(szVal);
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| 48 | const char *psz;
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| 49 | int rc;
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| 50 |
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| 51 | *pcb = 0;
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| 52 | rc = kHlpGetEnv(pszVar, szVal, cchVal);
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| 53 | if (rc)
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| 54 | return rc;
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| 55 |
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| 56 | /* figure out the base. */
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| 57 | uBase = 10;
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| 58 | psz = szVal;
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| 59 | if ( *psz == '0'
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| 60 | && (psz[1] == 'x' || psz[1] == 'X'))
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| 61 | {
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| 62 | uBase = 16;
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| 63 | psz += 2;
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| 64 | }
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| 65 |
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| 66 | /* convert it up to the first unknown char. */
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| 67 | cb = 0;
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| 68 | for(;;)
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| 69 | {
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| 70 | const char ch = *psz;
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| 71 | unsigned uDigit;
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| 72 | if (!ch)
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| 73 | break;
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| 74 | else if (ch >= '0' && ch <= '9')
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| 75 | uDigit = ch - '0';
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| 76 | else if (ch >= 'a' && ch <= 'z')
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| 77 | uDigit = ch - 'a' + 10;
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| 78 | else if (ch >= 'A' && ch <= 'Z')
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| 79 | uDigit = ch - 'A' + 10;
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| 80 | else
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| 81 | break;
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| 82 | if (uDigit >= uBase)
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| 83 | break;
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| 84 |
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| 85 | /* add the digit */
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| 86 | cb *= uBase;
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| 87 | cb += uDigit;
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| 88 |
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| 89 | psz++;
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| 90 | }
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| 91 |
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| 92 | /* check for unit */
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| 93 | if (*psz == 'm' || *psz == 'M')
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| 94 | cb *= 1024*1024;
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| 95 | else if (*psz == 'k' ||*psz == 'K')
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| 96 | cb *= 1024;
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| 97 | else if (*psz == 'g' || *psz == 'G')
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| 98 | cb *= 1024*1024*1024;
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| 99 |
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| 100 | *pcb = cb;
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| 101 | return 0;
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| 102 | }
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| 103 |
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| 104 |
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