linux/fs/9p/error.c
Eric Van Hensbergen e540eb45a5 [PATCH] 9p: null terminate error strings for debug print
We weren't properly NULL terminating protocol error strings for our debug
printk resulting in garbage being included in the output when debug was
enabled.

Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-01-26 13:51:00 -08:00

93 lines
2.2 KiB
C

/*
* linux/fs/9p/error.c
*
* Error string handling
*
* Plan 9 uses error strings, Unix uses error numbers. These functions
* try to help manage that and provide for dynamically adding error
* mappings.
*
* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to:
* Free Software Foundation
* 51 Franklin Street, Fifth Floor
* Boston, MA 02111-1301 USA
*
*/
#include <linux/module.h>
#include <linux/list.h>
#include <linux/jhash.h>
#include "debug.h"
#include "error.h"
/**
* v9fs_error_init - preload
* @errstr: error string
*
*/
int v9fs_error_init(void)
{
struct errormap *c;
int bucket;
/* initialize hash table */
for (bucket = 0; bucket < ERRHASHSZ; bucket++)
INIT_HLIST_HEAD(&hash_errmap[bucket]);
/* load initial error map into hash table */
for (c = errmap; c->name != NULL; c++) {
c->namelen = strlen(c->name);
bucket = jhash(c->name, c->namelen, 0) % ERRHASHSZ;
INIT_HLIST_NODE(&c->list);
hlist_add_head(&c->list, &hash_errmap[bucket]);
}
return 1;
}
/**
* errstr2errno - convert error string to error number
* @errstr: error string
*
*/
int v9fs_errstr2errno(char *errstr, int len)
{
int errno = 0;
struct hlist_node *p = NULL;
struct errormap *c = NULL;
int bucket = jhash(errstr, len, 0) % ERRHASHSZ;
hlist_for_each_entry(c, p, &hash_errmap[bucket], list) {
if (c->namelen==len && !memcmp(c->name, errstr, len)) {
errno = c->val;
break;
}
}
if (errno == 0) {
/* TODO: if error isn't found, add it dynamically */
errstr[len] = 0;
printk(KERN_ERR "%s: errstr :%s: not found\n", __FUNCTION__,
errstr);
errno = 1;
}
return -errno;
}