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/*
* \file restore.c
*
* Time-stamp: "2010-08-22 11:04:00 bkorb"
*
* This module's routines will save the current option state to memory
* and restore it. If saved prior to the initial optionProcess call,
* then the initial state will be restored.
*
* This file is part of AutoOpts, a companion to AutoGen.
* AutoOpts is free software.
* AutoOpts is Copyright (c) 1992-2012 by Bruce Korb - all rights reserved
*
* AutoOpts is available under any one of two licenses. The license
* in use must be one of these two and the choice is under the control
* of the user of the license.
*
* The GNU Lesser General Public License, version 3 or later
* See the files "COPYING.lgplv3" and "COPYING.gplv3"
*
* The Modified Berkeley Software Distribution License
* See the file "COPYING.mbsd"
*
* These files have the following md5sums:
*
* 43b91e8ca915626ed3818ffb1b71248b pkg/libopts/COPYING.gplv3
* 06a1a2e4760c90ea5e1dad8dfaac4d39 pkg/libopts/COPYING.lgplv3
* 66a5cedaf62c4b2637025f049f9b826f pkg/libopts/COPYING.mbsd
*/
/*
* optionFixupSavedOpts Really, it just wipes out option state for
* options that are troublesome to copy. viz., stacked strings and
* hierarcicaly valued option args. We do duplicate string args that
* have been marked as allocated though.
*/
static void
fixupSavedOptionArgs(tOptions* pOpts)
{
tOptions* p = pOpts->pSavedState;
tOptDesc* pOD = pOpts->pOptDesc;
int ct = pOpts->optCt;
/*
* Make sure that allocated stuff is only referenced in the
* archived copy of the data.
*/
for (; ct-- > 0; pOD++) {
switch (OPTST_GET_ARGTYPE(pOD->fOptState)) {
case OPARG_TYPE_STRING:
if (pOD->fOptState & OPTST_STACKED) {
tOptDesc* q = p->pOptDesc + (pOD - pOpts->pOptDesc);
q->optCookie = NULL;
}
if (pOD->fOptState & OPTST_ALLOC_ARG) {
tOptDesc* q = p->pOptDesc + (pOD - pOpts->pOptDesc);
AGDUPSTR(q->optArg.argString, pOD->optArg.argString, "arg");
}
break;
case OPARG_TYPE_HIERARCHY:
{
tOptDesc* q = p->pOptDesc + (pOD - pOpts->pOptDesc);
q->optCookie = NULL;
}
}
}
}
/*=export_func optionSaveState
*
* what: saves the option state to memory
* arg: tOptions*, pOpts, program options descriptor
*
* doc:
*
* This routine will allocate enough memory to save the current option
* processing state. If this routine has been called before, that memory
* will be reused. You may only save one copy of the option state. This
* routine may be called before optionProcess(3AO). If you do call it
* before the first call to optionProcess, then you may also change the
* contents of argc/argv after you call optionRestore(3AO)
*
* In fact, more strongly put: it is safest to only use this function
* before having processed any options. In particular, the saving and
* restoring of stacked string arguments and hierarchical values is
* disabled. The values are not saved.
*
* err: If it fails to allocate the memory,
* it will print a message to stderr and exit.
* Otherwise, it will always succeed.
=*/
void
optionSaveState(tOptions* pOpts)
{
tOptions* p = (tOptions*)pOpts->pSavedState;
if (p == NULL) {
size_t sz = sizeof(*pOpts) + (pOpts->optCt * sizeof(tOptDesc));
p = AGALOC(sz, "saved option state");
if (p == NULL) {
tCC* pzName = pOpts->pzProgName;
if (pzName == NULL) {
pzName = pOpts->pzPROGNAME;
if (pzName == NULL)
pzName = zNil;
}
fprintf(stderr, zCantSave, pzName, sz);
exit(EXIT_FAILURE);
}
pOpts->pSavedState = p;
}
memcpy(p, pOpts, sizeof(*p));
memcpy(p + 1, pOpts->pOptDesc, p->optCt * sizeof(tOptDesc));
fixupSavedOptionArgs(pOpts);
}
/*=export_func optionRestore
*
* what: restore option state from memory copy
* arg: tOptions*, pOpts, program options descriptor
*
* doc: Copy back the option state from saved memory.
* The allocated memory is left intact, so this routine can be
* called repeatedly without having to call optionSaveState again.
* If you are restoring a state that was saved before the first call
* to optionProcess(3AO), then you may change the contents of the
* argc/argv parameters to optionProcess.
*
* err: If you have not called @code{optionSaveState} before, a diagnostic is
* printed to @code{stderr} and exit is called.
=*/
void
optionRestore(tOptions* pOpts)
{
tOptions* p = (tOptions*)pOpts->pSavedState;
if (p == NULL) {
tCC* pzName = pOpts->pzProgName;
if (pzName == NULL) {
pzName = pOpts->pzPROGNAME;
if (pzName == NULL)
pzName = zNil;
}
fprintf(stderr, zNoState, pzName);
exit(EXIT_FAILURE);
}
pOpts->pSavedState = NULL;
optionFree(pOpts);
memcpy(pOpts, p, sizeof(*p));
memcpy(pOpts->pOptDesc, p+1, p->optCt * sizeof(tOptDesc));
pOpts->pSavedState = p;
fixupSavedOptionArgs(pOpts);
}
/* = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = */
/*=export_func optionFree
*
* what: free allocated option processing memory
* arg: tOptions*, pOpts, program options descriptor
*
* doc: AutoOpts sometimes allocates memory and puts pointers to it in the
* option state structures. This routine deallocates all such memory.
*
* err: As long as memory has not been corrupted,
* this routine is always successful.
=*/
void
optionFree(tOptions* pOpts)
{
free_saved_state:
{
tOptDesc* p = pOpts->pOptDesc;
int ct = pOpts->optCt;
do {
if (p->fOptState & OPTST_ALLOC_ARG) {
AGFREE(p->optArg.argString);
p->optArg.argString = NULL;
p->fOptState &= ~OPTST_ALLOC_ARG;
}
switch (OPTST_GET_ARGTYPE(p->fOptState)) {
case OPARG_TYPE_STRING:
#ifdef WITH_LIBREGEX
if ( (p->fOptState & OPTST_STACKED)
&& (p->optCookie != NULL)) {
p->optArg.argString = ".*";
optionUnstackArg(pOpts, p);
}
#else
/* leak memory */;
#endif
break;
case OPARG_TYPE_HIERARCHY:
if (p->optCookie != NULL)
unload_arg_list(p->optCookie);
break;
}
p->optCookie = NULL;
} while (p++, --ct > 0);
}
if (pOpts->pSavedState != NULL) {
tOptions * p = (tOptions*)pOpts->pSavedState;
memcpy(pOpts, p, sizeof(*p));
memcpy(pOpts->pOptDesc, p+1, p->optCt * sizeof(tOptDesc));
AGFREE(pOpts->pSavedState);
pOpts->pSavedState = NULL;
goto free_saved_state;
}
}
/*
* Local Variables:
* mode: C
* c-file-style: "stroustrup"
* indent-tabs-mode: nil
* End:
* end of autoopts/restore.c */
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