| 1 | /* $Id: kHlpGetEnvUZ.c 29 2009-07-01 20:30:29Z 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-kStuff-spamix@anduin.net>
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| 8 | *
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| 9 | * Permission is hereby granted, free of charge, to any person
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| 10 | * obtaining a copy of this software and associated documentation
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| 11 | * files (the "Software"), to deal in the Software without
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| 12 | * restriction, including without limitation the rights to use,
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| 13 | * copy, modify, merge, publish, distribute, sublicense, and/or sell
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| 14 | * copies of the Software, and to permit persons to whom the
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| 15 | * Software is furnished to do so, subject to the following
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| 16 | * conditions:
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| 17 | *
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| 18 | * The above copyright notice and this permission notice shall be
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| 19 | * included in all copies or substantial portions of the Software.
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| 20 | *
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| 21 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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| 22 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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| 23 | * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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| 24 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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| 25 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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| 26 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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| 27 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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| 28 | * OTHER DEALINGS IN THE SOFTWARE.
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| 29 | */
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| 30 |
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| 31 | /*******************************************************************************
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| 32 | * Header Files *
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| 33 | *******************************************************************************/
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| 34 | #include <k/kHlpEnv.h>
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| 35 | #include <k/kHlpString.h>
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| 36 |
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| 37 |
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| 38 | /**
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| 39 | * Gets an environment variable and converts it to a KSIZE.
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| 40 | *
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| 41 | * @returns 0 and *pcb on success.
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| 42 | * @returns On failure see kHlpGetEnv.
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| 43 | * @param pszVar The name of the variable.
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| 44 | * @param pcb Where to put the value.
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| 45 | */
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| 46 | KHLP_DECL(int) kHlpGetEnvUZ(const char *pszVar, KSIZE *pcb)
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| 47 | {
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| 48 | KSIZE cb;
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| 49 | unsigned uBase;
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| 50 | char szVal[64];
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| 51 | KSIZE cchVal = sizeof(szVal);
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| 52 | const char *psz;
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| 53 | int rc;
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| 54 |
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| 55 | *pcb = 0;
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| 56 | rc = kHlpGetEnv(pszVar, szVal, cchVal);
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| 57 | if (rc)
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| 58 | return rc;
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| 59 |
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| 60 | /* figure out the base. */
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| 61 | uBase = 10;
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| 62 | psz = szVal;
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| 63 | if ( *psz == '0'
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| 64 | && (psz[1] == 'x' || psz[1] == 'X'))
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| 65 | {
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| 66 | uBase = 16;
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| 67 | psz += 2;
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| 68 | }
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| 69 |
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| 70 | /* convert it up to the first unknown char. */
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| 71 | cb = 0;
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| 72 | for(;;)
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| 73 | {
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| 74 | const char ch = *psz;
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| 75 | unsigned uDigit;
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| 76 | if (!ch)
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| 77 | break;
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| 78 | else if (ch >= '0' && ch <= '9')
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| 79 | uDigit = ch - '0';
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| 80 | else if (ch >= 'a' && ch <= 'z')
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| 81 | uDigit = ch - 'a' + 10;
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| 82 | else if (ch >= 'A' && ch <= 'Z')
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| 83 | uDigit = ch - 'A' + 10;
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| 84 | else
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| 85 | break;
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| 86 | if (uDigit >= uBase)
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| 87 | break;
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| 88 |
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| 89 | /* add the digit */
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| 90 | cb *= uBase;
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| 91 | cb += uDigit;
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| 92 |
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| 93 | psz++;
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| 94 | }
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| 95 |
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| 96 | /* check for unit */
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| 97 | if (*psz == 'm' || *psz == 'M')
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| 98 | cb *= 1024*1024;
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| 99 | else if (*psz == 'k' ||*psz == 'K')
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| 100 | cb *= 1024;
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| 101 | else if (*psz == 'g' || *psz == 'G')
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| 102 | cb *= 1024*1024*1024;
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| 103 |
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| 104 | *pcb = cb;
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| 105 | return 0;
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| 106 | }
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| 107 |
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| 108 |
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