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/* $Id: kHlpGetEnvUZ.c 29 2009-07-01 20:30:29Z bird $ */
/** @file
* kHlpEnv - kHlpGetEnvUZ.
*/
/*
* Copyright (c) 2006-2007 Knut St. Osmundsen <bird-kStuff-spamix@anduin.net>
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
/*******************************************************************************
* Header Files *
*******************************************************************************/
#include <k/kHlpEnv.h>
#include <k/kHlpString.h>
/**
* Gets an environment variable and converts it to a KSIZE.
*
* @returns 0 and *pcb on success.
* @returns On failure see kHlpGetEnv.
* @param pszVar The name of the variable.
* @param pcb Where to put the value.
*/
KHLP_DECL(int) kHlpGetEnvUZ(const char *pszVar, KSIZE *pcb)
{
KSIZE cb;
unsigned uBase;
char szVal[64];
KSIZE cchVal = sizeof(szVal);
const char *psz;
int rc;
*pcb = 0;
rc = kHlpGetEnv(pszVar, szVal, cchVal);
if (rc)
return rc;
/* figure out the base. */
uBase = 10;
psz = szVal;
if ( *psz == '0'
&& (psz[1] == 'x' || psz[1] == 'X'))
{
uBase = 16;
psz += 2;
}
/* convert it up to the first unknown char. */
cb = 0;
for(;;)
{
const char ch = *psz;
unsigned uDigit;
if (!ch)
break;
else if (ch >= '0' && ch <= '9')
uDigit = ch - '0';
else if (ch >= 'a' && ch <= 'z')
uDigit = ch - 'a' + 10;
else if (ch >= 'A' && ch <= 'Z')
uDigit = ch - 'A' + 10;
else
break;
if (uDigit >= uBase)
break;
/* add the digit */
cb *= uBase;
cb += uDigit;
psz++;
}
/* check for unit */
if (*psz == 'm' || *psz == 'M')
cb *= 1024*1024;
else if (*psz == 'k' ||*psz == 'K')
cb *= 1024;
else if (*psz == 'g' || *psz == 'G')
cb *= 1024*1024*1024;
*pcb = cb;
return 0;
}
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