1 /* 2 * Copyright (c) 1980 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 static char sccsid[] = "@(#)mkswapconf.c 5.10 (Berkeley) 07/01/91"; 10 #endif /* not lint */ 11 12 /* 13 * Build a swap configuration file. 14 */ 15 #include "config.h" 16 17 #include <stdio.h> 18 #include <ctype.h> 19 20 swapconf() 21 { 22 register struct file_list *fl; 23 struct file_list *do_swap(); 24 25 fl = conf_list; 26 while (fl) { 27 if (fl->f_type != SYSTEMSPEC) { 28 fl = fl->f_next; 29 continue; 30 } 31 fl = do_swap(fl); 32 } 33 } 34 35 struct file_list * 36 do_swap(fl) 37 register struct file_list *fl; 38 { 39 FILE *fp; 40 char swapname[80]; 41 register struct file_list *swap; 42 dev_t dev; 43 44 if (eq(fl->f_fn, "generic")) { 45 fl = fl->f_next; 46 return (fl->f_next); 47 } 48 (void) sprintf(swapname, "swap%s.c", fl->f_fn); 49 fp = fopen(path(swapname), "w"); 50 if (fp == 0) { 51 perror(path(swapname)); 52 exit(1); 53 } 54 fprintf(fp, "#include \"sys/param.h\"\n"); 55 fprintf(fp, "#include \"sys/conf.h\"\n"); 56 fprintf(fp, "\n"); 57 /* 58 * If there aren't any swap devices 59 * specified, just return, the error 60 * has already been noted. 61 */ 62 swap = fl->f_next; 63 if (swap == 0 || swap->f_type != SWAPSPEC) { 64 (void) unlink(path(swapname)); 65 fclose(fp); 66 return (swap); 67 } 68 fprintf(fp, "dev_t\trootdev = makedev(%d, %d);\n", 69 major(fl->f_rootdev), minor(fl->f_rootdev)); 70 fprintf(fp, "dev_t\tdumpdev = makedev(%d, %d);\n", 71 major(fl->f_dumpdev), minor(fl->f_dumpdev)); 72 fprintf(fp, "\n"); 73 fprintf(fp, "struct\tswdevt swdevt[] = {\n"); 74 do { 75 dev = swap->f_swapdev; 76 fprintf(fp, "\t{ makedev(%d, %d),\t0,\t%d },\t/* %s */\n", 77 major(dev), minor(dev), swap->f_swapsize, swap->f_fn); 78 swap = swap->f_next; 79 } while (swap && swap->f_type == SWAPSPEC); 80 fprintf(fp, "\t{ 0, 0, 0 }\n"); 81 fprintf(fp, "};\n"); 82 fclose(fp); 83 return (swap); 84 } 85 86 static int devtablenotread = 1; 87 static struct devdescription { 88 char *dev_name; 89 int dev_major; 90 struct devdescription *dev_next; 91 } *devtable; 92 93 /* 94 * Given a device name specification figure out: 95 * major device number 96 * partition 97 * device name 98 * unit number 99 * This is a hack, but the system still thinks in 100 * terms of major/minor instead of string names. 101 */ 102 dev_t 103 nametodev(name, defunit, defpartition) 104 char *name; 105 int defunit; 106 char defpartition; 107 { 108 char *cp, partition; 109 int unit; 110 register struct devdescription *dp; 111 112 cp = name; 113 if (cp == 0) { 114 fprintf(stderr, "config: internal error, nametodev\n"); 115 exit(1); 116 } 117 while (*cp && !isdigit(*cp)) 118 cp++; 119 unit = *cp ? atoi(cp) : defunit; 120 if (unit < 0 || unit > 31) { 121 fprintf(stderr, 122 "config: %s: invalid device specification, unit out of range\n", name); 123 unit = defunit; /* carry on more checking */ 124 } 125 if (*cp) { 126 *cp++ = '\0'; 127 while (*cp && isdigit(*cp)) 128 cp++; 129 } 130 partition = *cp ? *cp : defpartition; 131 if (partition < 'a' || partition > 'h') { 132 fprintf(stderr, 133 "config: %c: invalid device specification, bad partition\n", *cp); 134 partition = defpartition; /* carry on */ 135 } 136 if (devtablenotread) 137 initdevtable(); 138 for (dp = devtable; dp; dp = dp->dev_next) 139 if (eq(name, dp->dev_name)) 140 break; 141 if (dp == 0) { 142 fprintf(stderr, "config: %s: unknown device\n", name); 143 return (NODEV); 144 } 145 return (makedev(dp->dev_major, (unit << 3) + (partition - 'a'))); 146 } 147 148 char * 149 devtoname(dev) 150 dev_t dev; 151 { 152 char buf[80]; 153 register struct devdescription *dp; 154 155 if (devtablenotread) 156 initdevtable(); 157 for (dp = devtable; dp; dp = dp->dev_next) 158 if (major(dev) == dp->dev_major) 159 break; 160 if (dp == 0) 161 dp = devtable; 162 (void) sprintf(buf, "%s%d%c", dp->dev_name, 163 minor(dev) >> 3, (minor(dev) & 07) + 'a'); 164 return (ns(buf)); 165 } 166 167 initdevtable() 168 { 169 char buf[BUFSIZ]; 170 int maj; 171 register struct devdescription **dp = &devtable; 172 FILE *fp; 173 174 (void) sprintf(buf, "../conf/devices.%s", machinename); 175 fp = fopen(buf, "r"); 176 if (fp == NULL) { 177 fprintf(stderr, "config: can't open %s\n", buf); 178 exit(1); 179 } 180 while (fscanf(fp, "%s\t%d\n", buf, &maj) == 2) { 181 *dp = (struct devdescription *)malloc(sizeof (**dp)); 182 (*dp)->dev_name = ns(buf); 183 (*dp)->dev_major = maj; 184 dp = &(*dp)->dev_next; 185 } 186 *dp = 0; 187 fclose(fp); 188 devtablenotread = 0; 189 } 190