fbda9f3280
Replaced $Id$ and $Header$ keywords with $Revision-Id$ Deleted $Log$ keywords and any log messages
58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
/*************************************************************************\
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* Copyright (c) 2009 UChicago Argonne LLC, as Operator of Argonne
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* National Laboratory.
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* EPICS BASE is distributed subject to a Software License Agreement found
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* in file LICENSE that is included with this distribution.
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\*************************************************************************/
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/* $Revision-Id$
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*
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* Macro expansion of environment variables
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define epicsExportSharedSymbols
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#include "cantProceed.h"
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#include "epicsString.h"
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#include "macLib.h"
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char * epicsShareAPI
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macEnvExpand(const char *str)
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{
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MAC_HANDLE *handle;
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static char *pairs[] = { "", "environ", NULL, NULL };
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long destCapacity = 128;
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char *dest = NULL;
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int n;
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if (macCreateHandle(&handle, pairs))
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cantProceed("macEnvExpand: macCreateHandle failed.");
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do {
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destCapacity *= 2;
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/*
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* Use free/malloc rather than realloc since there's no need to
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* keep the original contents.
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*/
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free(dest);
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dest = mallocMustSucceed(destCapacity, "macEnvExpand");
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n = macExpandString(handle, str, dest, destCapacity);
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} while (n >= (destCapacity - 1));
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if (n < 0) {
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free(dest);
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dest = NULL;
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} else {
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size_t unused = destCapacity - ++n;
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if (unused >= 20)
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dest = realloc(dest, n);
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}
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if (macDeleteHandle(handle))
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cantProceed("macEnvExpand: macDeleteHandle failed.");
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return dest;
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}
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