[unix-history] / usr / src / usr.sbin / diskpart / diskpart.c

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1983 Regents of the University of California.\n\
 All rights reserved.\n";
#endif not lint

#ifndef lint
static char sccsid[] = "@(#)diskpart.c	5.4 (Berkeley) %G%";
#endif not lint

/*
 * Program to calculate standard disk partition sizes.
 */
#include <sys/param.h>

#include <stdio.h>
#include <disktab.h>

#define	NPARTITIONS	8
#define	PART(x)		(x - 'a')

/*
 * Default partition sizes, where they exist.
 */
#define	NDEFAULTS	4
int	defpart[NDEFAULTS][NPARTITIONS] = {
   { 15884, 66880, 0, 15884, 307200, 0, 0, 291346 },	/* ~ 356+ Mbytes */
   { 15884, 33440, 0, 15884, 55936, 0, 0, 291346 },	/* ~ 206-355 Mbytes */
   { 15884, 33440, 0, 15884, 55936, 0, 0, 0 },		/* ~ 61-205 Mbytes */
   { 15884, 10032, 0, 15884, 0, 0, 0, 0 },		/* ~ 20-60 Mbytes */
};

/*
 * Each array defines a layout for a disk;
 * that is, the collection of partitions totally
 * covers the physical space on a disk.
 */
#define	NLAYOUTS	3
char	layouts[NLAYOUTS][NPARTITIONS] = {
   { 'a', 'b', 'h', 'g' },
   { 'a', 'b', 'h', 'd', 'e', 'f' },
   { 'c' },
};

/*
 * Default disk block and disk block fragment
 * sizes for each file system.  Those file systems
 * with zero block and frag sizes are special cases
 * (e.g. swap areas or for access to the entire device).
 */
struct	defparam {
	int	p_bsize;	/* block size */
	int	p_fsize;	/* frag size */
} defparam[NPARTITIONS] = {
	{ 8192, 1024 },		/* a */
	{ 0 },			/* b */
	{ 0 },			/* c */
	{ 8192, 1024 },		/* d */
	{ 4096, 512 },		/* e */
	{ 4096, 1024 },		/* f */
	{ 4096, 1024 },		/* g */
	{ 4096, 512 }		/* h */
};

/*
 * Each disk has some space reserved for a bad sector
 * forwarding table.  DEC standard 144 uses the first
 * 5 even numbered sectors in the last track of the
 * last cylinder for replicated storage of the bad sector
 * table; another 126 sectors past this is needed as a
 * pool of replacement sectors.
 */
int	badsecttable = 126;	/* # sectors */

int	pflag;			/* print device driver partition tables */
int	dflag;			/* print disktab entry */

struct	disktab *promptfordisk();

main(argc, argv)
	int argc;
	char *argv[];
{
	struct disktab *dp;
	register int curcyl, spc, def, part, layout;
	int threshhold, numcyls[NPARTITIONS], startcyl[NPARTITIONS];
	char *lp;

	argc--, argv++;
	if (argc < 1) {
		fprintf(stderr, "usage: disktab [ -p ] [ -d ] disk-type\n");
		exit(1);
	}
	if (argc > 0 && strcmp(*argv, "-p") == 0) {
		pflag++;
		argc--, argv++;
	}
	if (argc > 0 && strcmp(*argv, "-d") == 0) {
		dflag++;
		argc--, argv++;
	}
	dp = getdiskbyname(*argv);
	if (dp == NULL) {
		if (isatty(0))
			dp = promptfordisk(*argv);
		if (dp == NULL) {
			fprintf(stderr, "%s: unknown disk type\n", *argv);
			exit(2);
		}
	}
	spc = dp->d_nsectors * dp->d_ntracks;
	/*
	 * Bad sector table contains one track for the replicated
	 * copies of the table and enough full tracks preceding
	 * the last track to hold the pool of free blocks to which
	 * bad sectors are mapped.
	 */
	badsecttable = dp->d_nsectors + roundup(badsecttable, dp->d_nsectors);
	threshhold = howmany(spc, badsecttable);
	if (dp->d_badsectforw == 0) {
		badsecttable = 0;
		threshhold = 0;
	}

	/* 
	 * Figure out if disk is large enough for
	 * expanded swap area and 'd', 'e', and 'f'
	 * partitions.  Otherwise, use smaller defaults
	 * based on RK07.
	 */
	for (def = 0; def < NDEFAULTS; def++) {
		curcyl = 0;
		for (part = PART('a'); part < NPARTITIONS; part++)
			curcyl += howmany(defpart[def][part], spc);
		if (curcyl < dp->d_ncylinders - threshhold)
			break;
	}
	if (def >= NDEFAULTS) {
		fprintf(stderr, "%s: disk too small, calculate by hand\n",
			*argv);
		exit(3);
	}

	/*
	 * Calculate number of cylinders allocated to each disk
	 * partition.  We may waste a bit of space here, but it's
	 * in the interest of compatibility (for mixed disk systems).
	 */
	for (curcyl = 0, part = PART('a'); part < NPARTITIONS; part++) {
		numcyls[part] = 0;
		if (defpart[def][part] != 0) {
			numcyls[part] = howmany(defpart[def][part], spc);
			curcyl += numcyls[part];
		}
	}
	numcyls[PART('f')] = dp->d_ncylinders - curcyl;
	numcyls[PART('g')] =
		numcyls[PART('d')] + numcyls[PART('e')] + numcyls[PART('f')];
	numcyls[PART('c')] = dp->d_ncylinders;
	defpart[def][PART('f')] = numcyls[PART('f')] * spc - badsecttable;
	defpart[def][PART('g')] = numcyls[PART('g')] * spc - badsecttable;
	defpart[def][PART('c')] = numcyls[PART('c')] * spc;

	/*
	 * Calculate starting cylinder number for each partition.
	 * Note the 'h' partition is physically located before the
	 * 'g' or 'd' partition.  This is reflected in the layout
	 * arrays defined above.
	 */
	for (layout = 0; layout < NLAYOUTS; layout++) {
		curcyl = 0;
		for (lp = layouts[layout]; *lp != 0; lp++) {
			startcyl[PART(*lp)] = curcyl;
			curcyl += numcyls[PART(*lp)];
		}
	}

	if (pflag) {
		printf("}, %s_sizes[%d] = {\n", dp->d_name, NPARTITIONS);
		for (part = PART('a'); part < NPARTITIONS; part++) {
			if (numcyls[part] == 0) {
				printf("\t0,\t0,\n");
				continue;
			}
			if (dp->d_sectoffset == 0) {
			       printf("\t%d,\t%d,\t\t/* %c=cyl %d thru %d */\n",
					defpart[def][part], startcyl[part],
					'A' + part, startcyl[part],
					startcyl[part] + numcyls[part] - 1);
				continue;
			}
			printf("\t%d,\t%d,\t\t/* %c=sectors %d thru %d */\n",
				defpart[def][part], spc * startcyl[part],
				'A' + part, spc * startcyl[part],
				spc * startcyl[part] + defpart[def][part] - 1);
		}
		exit(0);
	}
	if (dflag) {
		int nparts;

		/*
		 * In case the disk is in the ``in-between'' range
		 * where the 'g' partition is smaller than the 'h'
		 * partition, reverse the frag sizes so the /usr partition
		 * is always set up with a frag size larger than the
		 * user's partition.
		 */
		if (defpart[def][PART('g')] < defpart[def][PART('h')]) {
			int temp;

			temp = defparam[PART('h')].p_fsize;
			defparam[PART('h')].p_fsize =
				defparam[PART('g')].p_fsize;
			defparam[PART('g')].p_fsize = temp;
		}
		printf("%s:\\\n", dp->d_name);
		printf("\t:ty=%s:ns#%d:nt#%d:nc#%d:%s%s\\\n", dp->d_type,
			dp->d_nsectors, dp->d_ntracks, dp->d_ncylinders,
			dp->d_badsectforw ? "sf:" : "",
			dp->d_sectoffset ? "so:" : "");
		for (nparts = 0, part = PART('a'); part < NPARTITIONS; part++)
			if (defpart[def][part] != 0)
				nparts++;
		for (part = PART('a'); part < NPARTITIONS; part++) {
			if (defpart[def][part] == 0)
				continue;
			printf("\t:p%c#%d:", 'a' + part, defpart[def][part]);
			if (defparam[part].p_bsize != 0) {
				printf("b%c#%d:f%c#%d:",
				  'a' + part, defparam[part].p_bsize,
				  'a' + part, defparam[part].p_fsize);
			}
			nparts--;
			printf("%s\n", nparts > 0 ? "\\" : "");
		}
		exit(0);
	}
	printf("%s: #sectors/track=%d, #tracks/cylinder=%d #cylinders=%d\n",
		dp->d_name, dp->d_nsectors, dp->d_ntracks, dp->d_ncylinders);
	printf("\n    Partition\t   Size\t   Range\n");
	for (part = PART('a'); part < NPARTITIONS; part++) {
		printf("\t%c\t", 'a' + part);
		if (numcyls[part] == 0) {
			printf(" unused\n");
			continue;
		}
		printf("%7d\t%4d - %d\n", defpart[def][part], startcyl[part],
			startcyl[part] + numcyls[part] - 1);
	}
}

struct disktab disk;

struct	field {
	char	*f_name;
	char	*f_defaults;
	int	*f_location;
} fields[] = {
	{ "sector size",		"512",	&disk.d_secsize },
	{ "#sectors/track",		0,	&disk.d_nsectors },
	{ "#tracks/cylinder",		0,	&disk.d_ntracks },
	{ "#cylinders",			0,	&disk.d_ncylinders },
	{ "revolutions/minute",		"3600",	&disk.d_rpm },
	{ 0, 0, 0 },
};

struct disktab *
promptfordisk(name)
	char *name;
{
	register struct disktab *dp = &disk;
	register struct field *fp;
	static char type[BUFSIZ];
	char buf[BUFSIZ], *cp, *gets();

	dp->d_name = name;
	fprintf(stderr,
		"%s: unknown disk type, want to supply parameters (y/n)? ",
		name);
	(void) gets(buf);
	if (*buf != 'y')
		return ((struct disktab *)0);
gettype:
	fprintf(stderr, "type (winchester|removable|simulated)? ");
	(void) gets(type);
	if (strcmp(type, "winchester") && strcmp(type, "removable") &&
	    strcmp(type, "simulated")) {
		fprintf(stderr, "%s: bad disk type\n", type);
		goto gettype;
	}
	dp->d_type = type;
	fprintf(stderr, "(type <cr> to get default value, if only one)\n");
	fprintf(stderr, "Do %ss require sector or cylinder offsets (%s)? ",
		dp->d_name, "cylinder");
	(void) gets(buf);
	if (*buf == 's')
		dp->d_sectoffset = 1;
	else
		dp->d_sectoffset = 0;
	fprintf(stderr, "Do %ss support bad144 bad block forwarding (yes)? ",
		dp->d_name);
	(void) gets(buf);
	if (*buf != 'n')
		dp->d_badsectforw = 1;
	else
		dp->d_badsectforw = 0;
	for (fp = fields; fp->f_name != NULL; fp++) {
again:
		fprintf(stderr, "%s ", fp->f_name);
		if (fp->f_defaults != NULL)
			fprintf(stderr, "(%s)", fp->f_defaults);
		fprintf(stderr, "? ");
		cp = gets(buf);
		if (*cp == '\0') {
			if (fp->f_defaults == NULL) {
				fprintf(stderr, "no default value\n");
				goto again;
			}
			cp = fp->f_defaults;
		}
		*fp->f_location = atoi(cp);
		if (*fp->f_location == 0) {
			fprintf(stderr, "%s: bad value\n", cp);
			goto again;
		}
	}
	return (dp);
}
Commit	Line	Data
54cf7c29 DF	1	/*
	2	* Copyright (c) 1983 Regents of the University of California.
	3	* All rights reserved. The Berkeley software License Agreement
	4	* specifies the terms and conditions for redistribution.
	5	*/
	6
	7	#ifndef lint
	8	char copyright[] =
	9	"@(#) Copyright (c) 1983 Regents of the University of California.\n\
	10	All rights reserved.\n";
	11	#endif not lint
	12
11236beb	13	#ifndef lint
f0a5197a	14	static char sccsid[] = "@(#)diskpart.c 5.4 (Berkeley) %G%";
54cf7c29	15	#endif not lint
11236beb SL	16
	17	/*
	18	* Program to calculate standard disk partition sizes.
	19	*/
	20	#include <sys/param.h>
	21
	22	#include <stdio.h>
	23	#include <disktab.h>
	24
	25	#define NPARTITIONS 8
	26	#define PART(x) (x - 'a')
	27
	28	/*
	29	* Default partition sizes, where they exist.
	30	*/
	31	#define NDEFAULTS 4
	32	int defpart[NDEFAULTS][NPARTITIONS] = {
	33	{ 15884, 66880, 0, 15884, 307200, 0, 0, 291346 }, /* ~ 356+ Mbytes */
	34	{ 15884, 33440, 0, 15884, 55936, 0, 0, 291346 }, /* ~ 206-355 Mbytes */
	35	{ 15884, 33440, 0, 15884, 55936, 0, 0, 0 }, /* ~ 61-205 Mbytes */
	36	{ 15884, 10032, 0, 15884, 0, 0, 0, 0 }, /* ~ 20-60 Mbytes */
	37	};
	38
	39	/*
	40	* Each array defines a layout for a disk;
	41	* that is, the collection of partitions totally
	42	* covers the physical space on a disk.
	43	*/
	44	#define NLAYOUTS 3
	45	char layouts[NLAYOUTS][NPARTITIONS] = {
	46	{ 'a', 'b', 'h', 'g' },
	47	{ 'a', 'b', 'h', 'd', 'e', 'f' },
	48	{ 'c' },
	49	};
	50
	51	/*
	52	* Default disk block and disk block fragment
	53	* sizes for each file system. Those file systems
	54	* with zero block and frag sizes are special cases
	55	* (e.g. swap areas or for access to the entire device).
	56	*/
	57	struct defparam {
	58	int p_bsize; /* block size */
	59	int p_fsize; /* frag size */
	60	} defparam[NPARTITIONS] = {
	61	{ 8192, 1024 }, /* a */
	62	{ 0 }, /* b */
	63	{ 0 }, /* c */
	64	{ 8192, 1024 }, /* d */
	65	{ 4096, 512 }, /* e */
	66	{ 4096, 1024 }, /* f */
	67	{ 4096, 1024 }, /* g */
	68	{ 4096, 512 } /* h */
	69	};
	70
	71	/*
	72	* Each disk has some space reserved for a bad sector
6a034b04 SL	73	* forwarding table. DEC standard 144 uses the first
	74	* 5 even numbered sectors in the last track of the
	75	* last cylinder for replicated storage of the bad sector
	76	* table; another 126 sectors past this is needed as a
	77	* pool of replacement sectors.
11236beb	78	*/
6a034b04	79	int badsecttable = 126; /* # sectors */
11236beb SL	80
	81	int pflag; /* print device driver partition tables */
	82	int dflag; /* print disktab entry */
	83
	84	struct disktab *promptfordisk();
	85
	86	main(argc, argv)
	87	int argc;
	88	char *argv[];
	89	{
	90	struct disktab *dp;
	91	register int curcyl, spc, def, part, layout;
	92	int threshhold, numcyls[NPARTITIONS], startcyl[NPARTITIONS];
	93	char *lp;
	94
	95	argc--, argv++;
	96	if (argc < 1) {
	97	fprintf(stderr, "usage: disktab [ -p ] [ -d ] disk-type\n");
	98	exit(1);
	99	}
	100	if (argc > 0 && strcmp(*argv, "-p") == 0) {
	101	pflag++;
	102	argc--, argv++;
	103	}
	104	if (argc > 0 && strcmp(*argv, "-d") == 0) {
	105	dflag++;
	106	argc--, argv++;
	107	}
	108	dp = getdiskbyname(*argv);
	109	if (dp == NULL) {
	110	if (isatty(0))
	111	dp = promptfordisk(*argv);
	112	if (dp == NULL) {
	113	fprintf(stderr, "%s: unknown disk type\n", *argv);
	114	exit(2);
	115	}
	116	}
	117	spc = dp->d_nsectors * dp->d_ntracks;
6a034b04 SL	118	/*
	119	* Bad sector table contains one track for the replicated
	120	* copies of the table and enough full tracks preceding
	121	* the last track to hold the pool of free blocks to which
	122	* bad sectors are mapped.
	123	*/
	124	badsecttable = dp->d_nsectors + roundup(badsecttable, dp->d_nsectors);
11236beb	125	threshhold = howmany(spc, badsecttable);
f0a5197a KM	126	if (dp->d_badsectforw == 0) {
	127	badsecttable = 0;
	128	threshhold = 0;
	129	}
11236beb SL	130
	131	/*
	132	* Figure out if disk is large enough for
	133	* expanded swap area and 'd', 'e', and 'f'
	134	* partitions. Otherwise, use smaller defaults
	135	* based on RK07.
	136	*/
	137	for (def = 0; def < NDEFAULTS; def++) {
	138	curcyl = 0;
	139	for (part = PART('a'); part < NPARTITIONS; part++)
	140	curcyl += howmany(defpart[def][part], spc);
	141	if (curcyl < dp->d_ncylinders - threshhold)
	142	break;
	143	}
	144	if (def >= NDEFAULTS) {
	145	fprintf(stderr, "%s: disk too small, calculate by hand\n",
	146	*argv);
	147	exit(3);
	148	}
	149
	150	/*
	151	* Calculate number of cylinders allocated to each disk
	152	* partition. We may waste a bit of space here, but it's
	153	* in the interest of compatibility (for mixed disk systems).
	154	*/
	155	for (curcyl = 0, part = PART('a'); part < NPARTITIONS; part++) {
	156	numcyls[part] = 0;
	157	if (defpart[def][part] != 0) {
	158	numcyls[part] = howmany(defpart[def][part], spc);
	159	curcyl += numcyls[part];
	160	}
	161	}
	162	numcyls[PART('f')] = dp->d_ncylinders - curcyl;
	163	numcyls[PART('g')] =
	164	numcyls[PART('d')] + numcyls[PART('e')] + numcyls[PART('f')];
	165	numcyls[PART('c')] = dp->d_ncylinders;
	166	defpart[def][PART('f')] = numcyls[PART('f')] * spc - badsecttable;
	167	defpart[def][PART('g')] = numcyls[PART('g')] * spc - badsecttable;
	168	defpart[def][PART('c')] = numcyls[PART('c')] * spc;
	169
	170	/*
	171	* Calculate starting cylinder number for each partition.
	172	* Note the 'h' partition is physically located before the
	173	* 'g' or 'd' partition. This is reflected in the layout
	174	* arrays defined above.
	175	*/
	176	for (layout = 0; layout < NLAYOUTS; layout++) {
	177	curcyl = 0;
	178	for (lp = layouts[layout]; *lp != 0; lp++) {
	179	startcyl[PART(*lp)] = curcyl;
	180	curcyl += numcyls[PART(*lp)];
	181	}
	182	}
	183
	184	if (pflag) {
	185	printf("}, %s_sizes[%d] = {\n", dp->d_name, NPARTITIONS);
	186	for (part = PART('a'); part < NPARTITIONS; part++) {
	187	if (numcyls[part] == 0) {
	188	printf("\t0,\t0,\n");
	189	continue;
	190	}
f0a5197a KM	191	if (dp->d_sectoffset == 0) {
	192	printf("\t%d,\t%d,\t\t/* %c=cyl %d thru %d */\n",
	193	defpart[def][part], startcyl[part],
	194	'A' + part, startcyl[part],
	195	startcyl[part] + numcyls[part] - 1);
	196	continue;
	197	}
	198	printf("\t%d,\t%d,\t\t/* %c=sectors %d thru %d */\n",
	199	defpart[def][part], spc * startcyl[part],
	200	'A' + part, spc * startcyl[part],
	201	spc * startcyl[part] + defpart[def][part] - 1);
11236beb SL	202	}
	203	exit(0);
	204	}
	205	if (dflag) {
510f89e2 SL	206	int nparts;
510f89e2 SL	207
11236beb SL	208	/*
	209	* In case the disk is in the ``in-between'' range
	210	* where the 'g' partition is smaller than the 'h'
	211	* partition, reverse the frag sizes so the /usr partition
	212	* is always set up with a frag size larger than the
	213	* user's partition.
	214	*/
	215	if (defpart[def][PART('g')] < defpart[def][PART('h')]) {
	216	int temp;
	217
	218	temp = defparam[PART('h')].p_fsize;
	219	defparam[PART('h')].p_fsize =
	220	defparam[PART('g')].p_fsize;
	221	defparam[PART('g')].p_fsize = temp;
	222	}
	223	printf("%s:\\\n", dp->d_name);
f0a5197a KM	224	printf("\t:ty=%s:ns#%d:nt#%d:nc#%d:%s%s\\\n", dp->d_type,
	225	dp->d_nsectors, dp->d_ntracks, dp->d_ncylinders,
	226	dp->d_badsectforw ? "sf:" : "",
	227	dp->d_sectoffset ? "so:" : "");
510f89e2 SL	228	for (nparts = 0, part = PART('a'); part < NPARTITIONS; part++)
	229	if (defpart[def][part] != 0)
	230	nparts++;
11236beb SL	231	for (part = PART('a'); part < NPARTITIONS; part++) {
	232	if (defpart[def][part] == 0)
	233	continue;
	234	printf("\t:p%c#%d:", 'a' + part, defpart[def][part]);
510f89e2	235	if (defparam[part].p_bsize != 0) {
11236beb SL	236	printf("b%c#%d:f%c#%d:",
	237	'a' + part, defparam[part].p_bsize,
	238	'a' + part, defparam[part].p_fsize);
510f89e2 SL	239	}
	240	nparts--;
	241	printf("%s\n", nparts > 0 ? "\\" : "");
11236beb SL	242	}
	243	exit(0);
	244	}
	245	printf("%s: #sectors/track=%d, #tracks/cylinder=%d #cylinders=%d\n",
	246	dp->d_name, dp->d_nsectors, dp->d_ntracks, dp->d_ncylinders);
	247	printf("\n Partition\t Size\t Range\n");
	248	for (part = PART('a'); part < NPARTITIONS; part++) {
	249	printf("\t%c\t", 'a' + part);
	250	if (numcyls[part] == 0) {
	251	printf(" unused\n");
	252	continue;
	253	}
	254	printf("%7d\t%4d - %d\n", defpart[def][part], startcyl[part],
	255	startcyl[part] + numcyls[part] - 1);
	256	}
	257	}
	258
	259	struct disktab disk;
	260
	261	struct field {
	262	char *f_name;
	263	char *f_defaults;
	264	int *f_location;
	265	} fields[] = {
	266	{ "sector size", "512", &disk.d_secsize },
	267	{ "#sectors/track", 0, &disk.d_nsectors },
	268	{ "#tracks/cylinder", 0, &disk.d_ntracks },
	269	{ "#cylinders", 0, &disk.d_ncylinders },
	270	{ "revolutions/minute", "3600", &disk.d_rpm },
	271	{ 0, 0, 0 },
	272	};
	273
	274	struct disktab *
	275	promptfordisk(name)
	276	char *name;
	277	{
	278	register struct disktab *dp = &disk;
	279	register struct field *fp;
	280	static char type[BUFSIZ];
	281	char buf[BUFSIZ], cp, gets();
	282
	283	dp->d_name = name;
	284	fprintf(stderr,
	285	"%s: unknown disk type, want to supply parameters (y/n)? ",
	286	name);
	287	(void) gets(buf);
	288	if (*buf != 'y')
	289	return ((struct disktab *)0);
	290	gettype:
	291	fprintf(stderr, "type (winchester\|removable\|simulated)? ");
	292	(void) gets(type);
	293	if (strcmp(type, "winchester") && strcmp(type, "removable") &&
	294	strcmp(type, "simulated")) {
	295	fprintf(stderr, "%s: bad disk type\n", type);
	296	goto gettype;
	297	}
	298	dp->d_type = type;
	299	fprintf(stderr, "(type <cr> to get default value, if only one)\n");
f0a5197a KM	300	fprintf(stderr, "Do %ss require sector or cylinder offsets (%s)? ",
	301	dp->d_name, "cylinder");
	302	(void) gets(buf);
	303	if (*buf == 's')
	304	dp->d_sectoffset = 1;
	305	else
	306	dp->d_sectoffset = 0;
	307	fprintf(stderr, "Do %ss support bad144 bad block forwarding (yes)? ",
	308	dp->d_name);
	309	(void) gets(buf);
	310	if (*buf != 'n')
	311	dp->d_badsectforw = 1;
	312	else
	313	dp->d_badsectforw = 0;
11236beb SL	314	for (fp = fields; fp->f_name != NULL; fp++) {
	315	again:
	316	fprintf(stderr, "%s ", fp->f_name);
	317	if (fp->f_defaults != NULL)
	318	fprintf(stderr, "(%s)", fp->f_defaults);
	319	fprintf(stderr, "? ");
	320	cp = gets(buf);
	321	if (*cp == '\0') {
	322	if (fp->f_defaults == NULL) {
	323	fprintf(stderr, "no default value\n");
	324	goto again;
	325	}
	326	cp = fp->f_defaults;
	327	}
	328	*fp->f_location = atoi(cp);
	329	if (*fp->f_location == 0) {
	330	fprintf(stderr, "%s: bad value\n", cp);
	331	goto again;
	332	}
	333	}
	334	return (dp);
	335	}