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/** BEGIN COPYRIGHT BLOCK
* Copyright (C) 2001 Sun Microsystems, Inc. Used by permission.
* Copyright (C) 2005 Red Hat, Inc.
* All rights reserved.
* END COPYRIGHT BLOCK **/
/*
* Description (nseframe.c)
*
* This module is part of the NSACL_RES_ERROR facility. It contains functions
* for allocating, freeing, and managing error frame structures. It
* does not contain routines for generating error messages through
* the use of a message file.
*/
#include "base/systems.h"
#include "netsite.h"
#include "libaccess/nserror.h"
/*
* Description (nserrDispose)
*
* This function is used to dispose of an entire list of error
* frames when the error information is no longer needed. It
* does not free the list head, since it is usually not dynamically
* allocated.
*
* Arguments:
*
* errp - error frame list head pointer
*/
void nserrDispose(NSErr_t * errp)
{
/* Ignore null list head */
if (errp == 0) return;
while (errp->err_first) {
nserrFFree(errp, errp->err_first);
}
}
/*
* Description (nserrFAlloc)
*
* This is the default allocator for error frame structures. It
* calls an allocator function indicated by err_falloc, if any,
* or else uses MALLOC().
*
* Arguments:
*
* errp - error frame list head pointer
* (may be null)
*
* Returns:
*
* The return value is a pointer to a cleared error frame. The
* frame will not have been added to the list referenced by errp.
* An allocation error is indicated by a null return value.
*/
NSEFrame_t * nserrFAlloc(NSErr_t * errp)
{
NSEFrame_t * efp; /* return error frame pointer */
/* Allocate the error frame */
efp = (errp && errp->err_falloc)
? (*errp->err_falloc)(errp)
: (NSEFrame_t *)MALLOC(sizeof(NSEFrame_t));
if (efp) {
/* Clear the error frame */
memset((void *)efp, 0, sizeof(NSEFrame_t));
}
return efp;
}
/*
* Description (nserrFFree)
*
* This function frees an error frame structure. If an error list
* head is specified, it first checks whether the indicated error
* frame is on the list, and removes it if so. If the ef_dispose
* field is non-null, the indicated function is called. The error
* frame is deallocated using either a function indicated by
* err_free in the list head, or FREE() otherwise.
*
* Arguments:
*
* errp - error frame list head pointer
* (may be null)
* efp - error frame pointer
*/
void nserrFFree(NSErr_t * errp, NSEFrame_t * efp)
{
NSEFrame_t **lefp; /* pointer to error frame pointer */
NSEFrame_t * pefp; /* previous error frame on list */
int i;
/* Ignore null error frame pointer */
if (efp == 0) return;
/* Got a list head? */
if (errp) {
/* Yes, see if this frame is on the list */
pefp = 0;
for (lefp = &errp->err_first; *lefp != 0; lefp = &pefp->ef_next) {
if (*lefp == efp) {
/* Yes, remove it */
*lefp = efp->ef_next;
if (errp->err_last == efp) errp->err_last = pefp;
break;
}
pefp = *lefp;
}
}
/* Free strings referenced by the frame */
for (i = 0; i < efp->ef_errc; ++i) {
if (efp->ef_errv[i]) {
FREE(efp->ef_errv[i]);
}
}
/* Free the frame */
if (errp && errp->err_ffree) {
(*errp->err_ffree)(errp, efp);
}
else {
FREE(efp);
}
}
/*
* Description (nserrGenerate)
*
* This function is called to generate an error frame and add it
* to a specified error list.
*
* Arguments:
*
* errp - error frame list head pointer
* (may be null)
* retcode - return code (ef_retcode)
* errorid - error id (ef_errorid)
* program - program string pointer (ef_program)
* errc - count of error arguments (ef_errc)
* ... - values for ef_errv[]
*
* Returns:
*
* The return value is a pointer to the generated error frame, filled
* in with the provided information. An allocation error is indicated
* by a null return value.
*/
NSEFrame_t * nserrGenerate(NSErr_t * errp, long retcode, long errorid,
char * program, int errc, ...)
{
NSEFrame_t * efp; /* error frame pointer */
char * esp; /* error string pointer */
int i;
va_list ap;
/* Null frame list head pointer means do nothing */
if (errp == 0) {
return 0;
}
/* Limit the number of values in ef_errv[] */
if (errc > NSERRMAXARG) errc = NSERRMAXARG;
/* Allocate the error frame */
efp = nserrFAlloc(errp);
/* Did we get it? */
if (efp) {
/* Yes, copy information into it */
efp->ef_retcode = retcode;
efp->ef_errorid = errorid;
efp->ef_program = program;
efp->ef_errc = errc;
/* Get the string arguments and copy them */
va_start(ap, errc);
for (i = 0; i < errc; ++i) {
esp = va_arg(ap, char *);
efp->ef_errv[i] = STRDUP(esp);
}
/* Add the frame to the list (if any) */
if (errp) {
efp->ef_next = errp->err_first;
errp->err_first = efp;
if (efp->ef_next == 0) errp->err_last = efp;
}
}
/* Return the error frame pointer */
return efp;
}
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