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Annotation of 42BSD/etc/config/mkswapconf.c, revision 1.1

1.1     ! root        1: #ifndef lint
        !             2: static char sccsid[] = "@(#)mkswapconf.c       4.1 (Berkeley) 8/13/83";
        !             3: #endif
        !             4: 
        !             5: /*
        !             6:  * Build a swap configuration file.
        !             7:  */
        !             8: #include "config.h"
        !             9: 
        !            10: #include <stdio.h>
        !            11: #include <ctype.h>
        !            12: 
        !            13: swapconf()
        !            14: {
        !            15:        register struct file_list *fl;
        !            16:        struct file_list *do_swap();
        !            17: 
        !            18:        fl = conf_list;
        !            19:        while (fl) {
        !            20:                if (fl->f_type != SYSTEMSPEC) {
        !            21:                        fl = fl->f_next;
        !            22:                        continue;
        !            23:                }
        !            24:                fl = do_swap(fl);
        !            25:        }
        !            26: }
        !            27: 
        !            28: struct file_list *
        !            29: do_swap(fl)
        !            30:        register struct file_list *fl;
        !            31: {
        !            32:        FILE *fp;
        !            33:        char  swapname[80], *cp;
        !            34:        register struct file_list *swap;
        !            35:        dev_t dev;
        !            36: 
        !            37:        if (eq(fl->f_fn, "generic")) {
        !            38:                fl = fl->f_next;
        !            39:                return (fl->f_next);
        !            40:        }
        !            41:        (void) sprintf(swapname, "swap%s.c", fl->f_fn);
        !            42:        fp = fopen(path(swapname), "w");
        !            43:        if (fp == 0) {
        !            44:                perror(path(swapname));
        !            45:                exit(1);
        !            46:        }
        !            47:        fprintf(fp, "#include \"../h/param.h\"\n");
        !            48:        fprintf(fp, "#include \"../h/conf.h\"\n");
        !            49:        fprintf(fp, "\n");
        !            50:        /*
        !            51:         * If there aren't any swap devices
        !            52:         * specified, just return, the error
        !            53:         * has already been noted.
        !            54:         */
        !            55:        swap = fl->f_next;
        !            56:        if (swap == 0 || swap->f_type != SWAPSPEC) {
        !            57:                (void) unlink(path(swapname));
        !            58:                fclose(fp);
        !            59:                return (swap);
        !            60:        }
        !            61:        fprintf(fp, "dev_t\trootdev = makedev(%d, %d);\n",
        !            62:                major(fl->f_rootdev), minor(fl->f_rootdev));
        !            63:        fprintf(fp, "dev_t\targdev  = makedev(%d, %d);\n",
        !            64:                major(fl->f_argdev), minor(fl->f_argdev));
        !            65:        fprintf(fp, "dev_t\tdumpdev = makedev(%d, %d);\n",
        !            66:                major(fl->f_dumpdev), minor(fl->f_dumpdev));
        !            67:        fprintf(fp, "\n");
        !            68:        fprintf(fp, "struct\tswdevt swdevt[] = {\n");
        !            69:        do {
        !            70:                dev = swap->f_swapdev;
        !            71:                fprintf(fp, "\t{ makedev(%d, %d),\t0,\t%d },\t/* %s */\n",
        !            72:                    major(dev), minor(dev), swap->f_swapsize, swap->f_fn);
        !            73:                swap = swap->f_next;
        !            74:        } while (swap && swap->f_type == SWAPSPEC);
        !            75:        fprintf(fp, "\t{ 0, 0, 0 }\n");
        !            76:        fprintf(fp, "};\n");
        !            77:        fclose(fp);
        !            78:        return (swap);
        !            79: }
        !            80: 
        !            81: static int devtablenotread = 1;
        !            82: static struct devdescription {
        !            83:        char    *dev_name;
        !            84:        int     dev_major;
        !            85:        struct  devdescription *dev_next;
        !            86: } *devtable;
        !            87: 
        !            88: /*
        !            89:  * Given a device name specification figure out:
        !            90:  *     major device number
        !            91:  *     partition
        !            92:  *     device name
        !            93:  *     unit number
        !            94:  * This is a hack, but the system still thinks in
        !            95:  * terms of major/minor instead of string names.
        !            96:  */
        !            97: dev_t
        !            98: nametodev(name, defunit, defpartition)
        !            99:        char *name;
        !           100:        int defunit;
        !           101:        char defpartition;
        !           102: {
        !           103:        char *cp, partition;
        !           104:        int unit;
        !           105:        register struct devdescription *dp;
        !           106: 
        !           107:        cp = name;
        !           108:        if (cp == 0) {
        !           109:                fprintf(stderr, "config: internal error, nametodev\n");
        !           110:                exit(1);
        !           111:        }
        !           112:        while (*cp && !isdigit(*cp))
        !           113:                cp++;
        !           114:        unit = *cp ? atoi(cp) : defunit;
        !           115:        if (unit < 0 || unit > 7) {
        !           116:                fprintf(stderr,
        !           117: "config: %s: invalid device specification, unit out of range\n", name);
        !           118:                unit = defunit;                 /* carry on more checking */
        !           119:        }
        !           120:        if (*cp) {
        !           121:                *cp++ = '\0';
        !           122:                while (*cp && isdigit(*cp))
        !           123:                        cp++;
        !           124:        }
        !           125:        partition = *cp ? *cp : defpartition;
        !           126:        if (partition < 'a' || partition > 'h') {
        !           127:                fprintf(stderr,
        !           128: "config: %c: invalid device specification, bad partition\n", *cp);
        !           129:                partition = defpartition;       /* carry on */
        !           130:        }
        !           131:        if (devtablenotread)
        !           132:                initdevtable();
        !           133:        for (dp = devtable; dp->dev_next; dp = dp->dev_next)
        !           134:                if (eq(name, dp->dev_name))
        !           135:                        break;
        !           136:        if (dp == 0) {
        !           137:                fprintf(stderr, "config: %s: unknown device\n", name);
        !           138:                return (NODEV);
        !           139:        }
        !           140:        return (makedev(dp->dev_major, (unit << 3) + (partition - 'a')));
        !           141: }
        !           142: 
        !           143: char *
        !           144: devtoname(dev)
        !           145:        dev_t dev;
        !           146: {
        !           147:        char buf[80]; 
        !           148:        register struct devdescription *dp;
        !           149: 
        !           150:        if (devtablenotread)
        !           151:                initdevtable();
        !           152:        for (dp = devtable; dp->dev_next; dp = dp->dev_next)
        !           153:                if (major(dev) == dp->dev_major)
        !           154:                        break;
        !           155:        if (dp == 0)
        !           156:                dp = devtable;
        !           157:        sprintf(buf, "%s%d%c", dp->dev_name,
        !           158:                minor(dev) >> 3, (minor(dev) & 07) + 'a');
        !           159:        return (ns(buf));
        !           160: }
        !           161: 
        !           162: initdevtable()
        !           163: {
        !           164:        char buf[BUFSIZ];
        !           165:        int maj;
        !           166:        register struct devdescription **dp = &devtable;
        !           167:        FILE *fp;
        !           168: 
        !           169:        sprintf(buf, "../conf/devices.%s", machinename);
        !           170:        fp = fopen(buf, "r");
        !           171:        if (fp == NULL) {
        !           172:                fprintf(stderr, "config: can't open %s\n", buf);
        !           173:                exit(1);
        !           174:        }
        !           175:        while (fscanf(fp, "%s\t%d\n", buf, &maj) == 2) {
        !           176:                *dp = (struct devdescription *)malloc(sizeof (**dp));
        !           177:                (*dp)->dev_name = ns(buf);
        !           178:                (*dp)->dev_major = maj;
        !           179:                dp = &(*dp)->dev_next;
        !           180:        }
        !           181:        *dp = 0;
        !           182:        fclose(fp);
        !           183:        devtablenotread = 0;
        !           184: }

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