eeprom/sparc/loadlogo.c

/*
 * 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
 */
#pragma ident   "%Z%%M% %I% %E% SMI"


/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <stdio.h>

extern int _error(int do_perror, char *fmt, ...);
#define NO_PERROR   0
#define PERROR      1

/*
 * Icon loader for eeprom command.
 *
 * Based on libsuntool/icon/icon_load.c 10.10 88/02/08
 * See <suntool/icon_load.h> for icon file format.
 */

int
loadlogo(char *name, int w, int h, char *logo)
{
    FILE *f;
    int c = 0;
    unsigned int val;
    int icw = 64, ich = 64, bits = 16;
    int count;

    if (!(f = fopen(name, "r")))
        return (_error(PERROR, "cannot open %s", name));

    do {
        int nval;
        char slash;

        if ((c = fscanf(f, "%*[^DFHVW*]")) == EOF)
            break;

        switch (c = getc(f)) {
        case 'D':
            if ((c = fscanf(f, "epth=%d", &nval)) == 1 &&
                nval != 1)
                goto badform;
            break;
        case 'F':
            if ((c = fscanf(f, "ormat_version=%d", &nval)) == 1 &&
                nval != 1)
                goto badform;
            break;
        case 'H':
            c = fscanf(f, "eight=%d", &ich);
            break;
        case 'V':
            c = fscanf(f, "alid_bits_per_item=%d", &bits);
            break;
        case 'W':
            c = fscanf(f, "idth=%d", &icw);
            break;
        case '*':
            c = fscanf(f, "%c", &slash);
            if (slash == '/')
                goto eoh; /* end of header */
            else
                (void) ungetc(slash, f);
            break;
        }
    } while (c != EOF);

eoh:
    if (c == EOF ||
        icw != w || ich != h ||
        bits != 16 && bits != 32) {
badform:
        (void) fclose(f);
        return (_error(NO_PERROR, "header format error in %s", name));
    }

    for (count = ((w + (bits - 1)) / bits) * h; count > 0; count--) {
        c = fscanf(f, " 0x%x,", &val);
        if (c == 0 || c == EOF)
            break;

        switch (bits) {
        case 32:
            *logo++ = val >> 24;
            *logo++ = val >> 16;
            /* FALLTHRU */
        case 16:
            *logo++ = val >> 8;
            *logo++ = val;
            break;
        }
    }

    (void) fclose(f);

    if (count > 0)
        return (_error(NO_PERROR, "data format error in %s", name));

    return (0);
}