libsvm/common/getdrvname.c

	getdrvname.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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 2003 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 <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)

/*
 * 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];
    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) {
        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);
}