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Annotation of 43BSDTahoe/etc/config/mkswapconf.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  */
        !            17: 
        !            18: #ifndef lint
        !            19: static char sccsid[] = "@(#)mkswapconf.c       5.6 (Berkeley) 6/18/88";
        !            20: #endif /* not lint */
        !            21: 
        !            22: /*
        !            23:  * Build a swap configuration file.
        !            24:  */
        !            25: #include "config.h"
        !            26: 
        !            27: #include <stdio.h>
        !            28: #include <ctype.h>
        !            29: 
        !            30: swapconf()
        !            31: {
        !            32:        register struct file_list *fl;
        !            33:        struct file_list *do_swap();
        !            34: 
        !            35:        fl = conf_list;
        !            36:        while (fl) {
        !            37:                if (fl->f_type != SYSTEMSPEC) {
        !            38:                        fl = fl->f_next;
        !            39:                        continue;
        !            40:                }
        !            41:                fl = do_swap(fl);
        !            42:        }
        !            43: }
        !            44: 
        !            45: struct file_list *
        !            46: do_swap(fl)
        !            47:        register struct file_list *fl;
        !            48: {
        !            49:        FILE *fp;
        !            50:        char  swapname[80];
        !            51:        register struct file_list *swap;
        !            52:        dev_t dev;
        !            53: 
        !            54:        if (eq(fl->f_fn, "generic")) {
        !            55:                fl = fl->f_next;
        !            56:                return (fl->f_next);
        !            57:        }
        !            58:        (void) sprintf(swapname, "swap%s.c", fl->f_fn);
        !            59:        fp = fopen(path(swapname), "w");
        !            60:        if (fp == 0) {
        !            61:                perror(path(swapname));
        !            62:                exit(1);
        !            63:        }
        !            64:        fprintf(fp, "#include \"../h/param.h\"\n");
        !            65:        fprintf(fp, "#include \"../h/conf.h\"\n");
        !            66:        fprintf(fp, "\n");
        !            67:        /*
        !            68:         * If there aren't any swap devices
        !            69:         * specified, just return, the error
        !            70:         * has already been noted.
        !            71:         */
        !            72:        swap = fl->f_next;
        !            73:        if (swap == 0 || swap->f_type != SWAPSPEC) {
        !            74:                (void) unlink(path(swapname));
        !            75:                fclose(fp);
        !            76:                return (swap);
        !            77:        }
        !            78:        fprintf(fp, "dev_t\trootdev = makedev(%d, %d);\n",
        !            79:                major(fl->f_rootdev), minor(fl->f_rootdev));
        !            80:        fprintf(fp, "dev_t\targdev  = makedev(%d, %d);\n",
        !            81:                major(fl->f_argdev), minor(fl->f_argdev));
        !            82:        fprintf(fp, "dev_t\tdumpdev = makedev(%d, %d);\n",
        !            83:                major(fl->f_dumpdev), minor(fl->f_dumpdev));
        !            84:        fprintf(fp, "\n");
        !            85:        fprintf(fp, "struct\tswdevt swdevt[] = {\n");
        !            86:        do {
        !            87:                dev = swap->f_swapdev;
        !            88:                fprintf(fp, "\t{ makedev(%d, %d),\t0,\t%d },\t/* %s */\n",
        !            89:                    major(dev), minor(dev), swap->f_swapsize, swap->f_fn);
        !            90:                swap = swap->f_next;
        !            91:        } while (swap && swap->f_type == SWAPSPEC);
        !            92:        fprintf(fp, "\t{ 0, 0, 0 }\n");
        !            93:        fprintf(fp, "};\n");
        !            94:        fclose(fp);
        !            95:        return (swap);
        !            96: }
        !            97: 
        !            98: static int devtablenotread = 1;
        !            99: static struct devdescription {
        !           100:        char    *dev_name;
        !           101:        int     dev_major;
        !           102:        struct  devdescription *dev_next;
        !           103: } *devtable;
        !           104: 
        !           105: /*
        !           106:  * Given a device name specification figure out:
        !           107:  *     major device number
        !           108:  *     partition
        !           109:  *     device name
        !           110:  *     unit number
        !           111:  * This is a hack, but the system still thinks in
        !           112:  * terms of major/minor instead of string names.
        !           113:  */
        !           114: dev_t
        !           115: nametodev(name, defunit, defpartition)
        !           116:        char *name;
        !           117:        int defunit;
        !           118:        char defpartition;
        !           119: {
        !           120:        char *cp, partition;
        !           121:        int unit;
        !           122:        register struct devdescription *dp;
        !           123: 
        !           124:        cp = name;
        !           125:        if (cp == 0) {
        !           126:                fprintf(stderr, "config: internal error, nametodev\n");
        !           127:                exit(1);
        !           128:        }
        !           129:        while (*cp && !isdigit(*cp))
        !           130:                cp++;
        !           131:        unit = *cp ? atoi(cp) : defunit;
        !           132:        if (unit < 0 || unit > 31) {
        !           133:                fprintf(stderr,
        !           134: "config: %s: invalid device specification, unit out of range\n", name);
        !           135:                unit = defunit;                 /* carry on more checking */
        !           136:        }
        !           137:        if (*cp) {
        !           138:                *cp++ = '\0';
        !           139:                while (*cp && isdigit(*cp))
        !           140:                        cp++;
        !           141:        }
        !           142:        partition = *cp ? *cp : defpartition;
        !           143:        if (partition < 'a' || partition > 'h') {
        !           144:                fprintf(stderr,
        !           145: "config: %c: invalid device specification, bad partition\n", *cp);
        !           146:                partition = defpartition;       /* carry on */
        !           147:        }
        !           148:        if (devtablenotread)
        !           149:                initdevtable();
        !           150:        for (dp = devtable; dp; dp = dp->dev_next)
        !           151:                if (eq(name, dp->dev_name))
        !           152:                        break;
        !           153:        if (dp == 0) {
        !           154:                fprintf(stderr, "config: %s: unknown device\n", name);
        !           155:                return (NODEV);
        !           156:        }
        !           157:        return (makedev(dp->dev_major, (unit << 3) + (partition - 'a')));
        !           158: }
        !           159: 
        !           160: char *
        !           161: devtoname(dev)
        !           162:        dev_t dev;
        !           163: {
        !           164:        char buf[80]; 
        !           165:        register struct devdescription *dp;
        !           166: 
        !           167:        if (devtablenotread)
        !           168:                initdevtable();
        !           169:        for (dp = devtable; dp; dp = dp->dev_next)
        !           170:                if (major(dev) == dp->dev_major)
        !           171:                        break;
        !           172:        if (dp == 0)
        !           173:                dp = devtable;
        !           174:        (void) sprintf(buf, "%s%d%c", dp->dev_name,
        !           175:                minor(dev) >> 3, (minor(dev) & 07) + 'a');
        !           176:        return (ns(buf));
        !           177: }
        !           178: 
        !           179: initdevtable()
        !           180: {
        !           181:        char buf[BUFSIZ];
        !           182:        int maj;
        !           183:        register struct devdescription **dp = &devtable;
        !           184:        FILE *fp;
        !           185: 
        !           186:        (void) sprintf(buf, "../conf/devices.%s", machinename);
        !           187:        fp = fopen(buf, "r");
        !           188:        if (fp == NULL) {
        !           189:                fprintf(stderr, "config: can't open %s\n", buf);
        !           190:                exit(1);
        !           191:        }
        !           192:        while (fscanf(fp, "%s\t%d\n", buf, &maj) == 2) {
        !           193:                *dp = (struct devdescription *)malloc(sizeof (**dp));
        !           194:                (*dp)->dev_name = ns(buf);
        !           195:                (*dp)->dev_major = maj;
        !           196:                dp = &(*dp)->dev_next;
        !           197:        }
        !           198:        *dp = 0;
        !           199:        fclose(fp);
        !           200:        devtablenotread = 0;
        !           201: }

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