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/*
* lib/krb5/ccache/file/fcc_destry.c
*
* Copyright 1990 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
*
* This file contains the source code for krb5_fcc_destroy.
*/
#include <errno.h>
#include "fcc.h"
/*
* Effects:
* Destroys the contents of id.
*
* Errors:
* system errors
*/
krb5_error_code krb5_fcc_destroy(id)
krb5_ccache id;
{
struct stat buf;
unsigned long size;
char zeros[BUFSIZ];
register int ret, i;
if (OPENCLOSE(id)) {
ret = open(((krb5_fcc_data *) id->data)->filename, O_RDWR, 0);
if (ret < 0) {
ret = krb5_fcc_interpret(errno);
goto cleanup;
}
((krb5_fcc_data *) id->data)->fd = ret;
}
else
lseek(((krb5_fcc_data *) id->data)->fd, 0, SEEK_SET);
ret = unlink(((krb5_fcc_data *) id->data)->filename);
if (ret < 0) {
ret = krb5_fcc_interpret(errno);
if (OPENCLOSE(id)) {
(void) close(((krb5_fcc_data *)id->data)->fd);
((krb5_fcc_data *) id->data)->fd = -1;
}
goto cleanup;
}
ret = fstat(((krb5_fcc_data *) id->data)->fd, &buf);
if (ret < 0) {
ret = krb5_fcc_interpret(errno);
if (OPENCLOSE(id)) {
(void) close(((krb5_fcc_data *)id->data)->fd);
((krb5_fcc_data *) id->data)->fd = -1;
}
goto cleanup;
}
/* XXX This may not be legal XXX */
size = (unsigned long) buf.st_size;
memset(zeros, 0, BUFSIZ);
for (i=0; i < size / BUFSIZ; i++)
if (write(((krb5_fcc_data *) id->data)->fd, zeros, BUFSIZ) < 0) {
ret = krb5_fcc_interpret(errno);
if (OPENCLOSE(id)) {
(void) close(((krb5_fcc_data *)id->data)->fd);
((krb5_fcc_data *) id->data)->fd = -1;
}
goto cleanup;
}
if (write(((krb5_fcc_data *) id->data)->fd, zeros, size % BUFSIZ) < 0) {
ret = krb5_fcc_interpret(errno);
if (OPENCLOSE(id)) {
(void) close(((krb5_fcc_data *)id->data)->fd);
((krb5_fcc_data *) id->data)->fd = -1;
}
goto cleanup;
}
ret = close(((krb5_fcc_data *) id->data)->fd);
((krb5_fcc_data *) id->data)->fd = -1;
if (ret)
ret = krb5_fcc_interpret(errno);
cleanup:
krb5_xfree(((krb5_fcc_data *) id->data)->filename);
krb5_xfree(id->data);
krb5_xfree(id);
return ret;
}
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