80 lines
1.9 KiB
C
80 lines
1.9 KiB
C
/*************************************************************************\
|
|
* Copyright (c) 2009 UChicago Argonne LLC, as Operator of Argonne
|
|
* National Laboratory.
|
|
* SPDX-License-Identifier: EPICS
|
|
* EPICS BASE is distributed subject to a Software License Agreement found
|
|
* in file LICENSE that is included with this distribution.
|
|
\*************************************************************************/
|
|
/*
|
|
* Macro expansion of environment variables
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include "errlog.h"
|
|
#include "epicsString.h"
|
|
#include "macLib.h"
|
|
|
|
char * epicsStdCall
|
|
macEnvExpand(const char *str)
|
|
{
|
|
return macDefExpand(str, NULL);
|
|
}
|
|
|
|
char * epicsStdCall
|
|
macDefExpand(const char *str, MAC_HANDLE *macros)
|
|
{
|
|
MAC_HANDLE *handle;
|
|
static const char * pairs[] = { "", "environ", NULL, NULL };
|
|
long destCapacity = 128;
|
|
char *dest = NULL;
|
|
char *newdest = NULL;
|
|
int n;
|
|
|
|
if (macros) {
|
|
handle = macros;
|
|
} else {
|
|
if (macCreateHandle(&handle, pairs)){
|
|
errlogMessage("macDefExpand: macCreateHandle failed.");
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
do {
|
|
destCapacity *= 2;
|
|
/*
|
|
* Use free/malloc rather than realloc since there's no need to
|
|
* keep the original contents.
|
|
*/
|
|
free(dest);
|
|
dest = malloc(destCapacity);
|
|
if(!dest)
|
|
goto done;
|
|
|
|
n = macExpandString(handle, str, dest, destCapacity);
|
|
} while (n >= (destCapacity - 1));
|
|
|
|
if (n < 0) {
|
|
free(dest);
|
|
dest = NULL;
|
|
} else {
|
|
size_t unused = destCapacity - ++n;
|
|
|
|
if (unused >= 20) {
|
|
newdest = realloc(dest, n);
|
|
if (newdest)
|
|
dest = newdest;
|
|
}
|
|
}
|
|
|
|
done:
|
|
if (macros == NULL) {
|
|
if (macDeleteHandle(handle)) {
|
|
errlogMessage("macDefExpand: macDeleteHandle failed.");
|
|
}
|
|
}
|
|
return dest;
|
|
}
|