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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <limits.h>
#include <sys/types.h>
#include <svm.h>
/*
* Macros to produce a quoted string containing the value of a
* preprocessor macro. For example, if SIZE is defined to be 256,
* VAL2STR(SIZE) is "256". This is used to construct format
* strings for scanf-family functions below.
*/
#define QUOTE(x) #x
#define VAL2STR(x) QUOTE(x)
static int is_blank(char *);
/*
* is_blank() returns 1 (true) if a line specified is composed of
* whitespace characters only. otherwise, it returns 0 (false).
*
* Note. the argument (line) must be null-terminated.
*/
static int
is_blank(char *line)
{
for (/* nothing */; *line != '\0'; line++)
if (!isspace(*line))
return (0);
return (1);
}
/*
* FUNCTION:
* Return the driver name for a major number
*
* INPUT: major number, mount point for name_to_major file, pointer
* to a valid buffer.
*
* RETURN VALUES:
* 0 - SUCCESS - buf contain the driver name.
* -1 - FAIL
*
*/
int
get_drv_name(major_t major, char *mnt, char *buf)
{
FILE *fp;
char drv[FILENAME_MAX + 1];
char entry[FILENAME_MAX + 1];
char line[MAX_N2M_ALIAS_LINE], *cp;
char fname[PATH_MAX];
int status = RET_NOERROR;
(void) snprintf(fname, sizeof (fname), "%s%s", mnt, NAME_TO_MAJOR);
if ((fp = fopen(fname, "r")) == NULL) {
return (RET_ERROR);
}
while ((fgets(line, sizeof (line), fp) != NULL) &&
status == RET_NOERROR) {
/* cut off comments starting with '#' */
if ((cp = strchr(line, '#')) != NULL)
*cp = '\0';
/* ignore comment or blank lines */
if (is_blank(line))
continue;
/* sanity-check */
if (sscanf(line,
"%" VAL2STR(FILENAME_MAX) "s %" VAL2STR(FILENAME_MAX) "s",
drv, entry) != 2) {
status = RET_ERROR;
}
if (atoi(entry) == major)
break;
}
if (status == RET_NOERROR)
(void) strcpy(buf, drv);
(void) fclose(fp);
return (status);
}
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