xref: /csrg-svn/games/fortune/strfile/strfile.c (revision 47857)

/*-
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Ken Arnold.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1989 The Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)strfile.c	5.12 (Berkeley) 04/08/91";
#endif /* not lint */

# include	<machine/endian.h>
# include	<sys/param.h>
# include	<stdio.h>
# include	<ctype.h>
# include	"strfile.h"

# ifndef MAXPATHLEN
# define	MAXPATHLEN	1024
# endif	/* MAXPATHLEN */

/*
 *	This program takes a file composed of strings seperated by
 * lines starting with two consecutive delimiting character (default
 * character is '%') and creates another file which consists of a table
 * describing the file (structure from "strfile.h"), a table of seek
 * pointers to the start of the strings, and the strings, each terminated
 * by a null byte.  Usage:
 *
 *	% strfile [-iorsx] [ -cC ] sourcefile [ datafile ]
 *
 *	c - Change delimiting character from '%' to 'C'
 *	s - Silent.  Give no summary of data processed at the end of
 *	    the run.
 *	o - order the strings in alphabetic order
 *	i - if ordering, ignore case
 *	r - randomize the order of the strings
 *	x - set rotated bit
 *
 *		Ken Arnold	Sept. 7, 1978 --
 *
 *	Added ordering options.
 */

# define	TRUE	1
# define	FALSE	0

# define	STORING_PTRS	(Oflag || Rflag)
# define	CHUNKSIZE	512

#ifdef lint
# define	ALWAYS	atoi("1")
#else
# define	ALWAYS	1
#endif
# define	ALLOC(ptr,sz)	if (ALWAYS) { \
			if (ptr == NULL) \
				ptr = malloc((unsigned int) (CHUNKSIZE * sizeof *ptr)); \
			else if (((sz) + 1) % CHUNKSIZE == 0) \
				ptr = realloc((void *) ptr, ((unsigned int) ((sz) + CHUNKSIZE) * sizeof *ptr)); \
			if (ptr == NULL) { \
				fprintf(stderr, "out of space\n"); \
				exit(1); \
			} \
		} else

#ifdef NO_VOID
# define	void	char
#endif

typedef struct {
	char	first;
	off_t	pos;
} STR;

char	*Infile		= NULL,		/* input file name */
	Outfile[MAXPATHLEN] = "",	/* output file name */
	Delimch		= '%';		/* delimiting character */

int	Sflag		= FALSE;	/* silent run flag */
int	Oflag		= FALSE;	/* ordering flag */
int	Iflag		= FALSE;	/* ignore case flag */
int	Rflag		= FALSE;	/* randomize order flag */
int	Xflag		= FALSE;	/* set rotated bit */
long	Num_pts		= 0;		/* number of pointers/strings */

off_t	*Seekpts;

FILE	*Sort_1, *Sort_2;		/* pointers for sorting */

STRFILE	Tbl;				/* statistics table */

STR	*Firstch;			/* first chars of each string */

char	*fgets(), *strcpy(), *strcat();

void	*malloc(), *realloc();

/*
 * main:
 *	Drive the sucker.  There are two main modes -- either we store
 *	the seek pointers, if the table is to be sorted or randomized,
 *	or we write the pointer directly to the file, if we are to stay
 *	in file order.  If the former, we allocate and re-allocate in
 *	CHUNKSIZE blocks; if the latter, we just write each pointer,
 *	and then seek back to the beginning to write in the table.
 */
main(ac, av)
int	ac;
char	**av;
{
	register char		*sp, dc;
	register FILE		*inf, *outf;
	register off_t		last_off, length, pos, *p;
	register int		first, cnt;
	register char		*nsp;
	register STR		*fp;
	static char		string[257];

	getargs(ac, av);		/* evalute arguments */
	dc = Delimch;
	if ((inf = fopen(Infile, "r")) == NULL) {
		perror(Infile);
		exit(1);
	}

	if ((outf = fopen(Outfile, "w")) == NULL) {
		perror(Outfile);
		exit(1);
	}
	if (!STORING_PTRS)
		(void) fseek(outf, sizeof Tbl, 0);

	/*
	 * Write the strings onto the file
	 */

	Tbl.str_longlen = 0;
	Tbl.str_shortlen = (unsigned int) 0xffffffff;
	Tbl.str_delim = dc;
	Tbl.str_version = VERSION;
	first = Oflag;
	add_offset(outf, ftell(inf));
	last_off = 0;
	do {
		sp = fgets(string, 256, inf);
		if (sp == NULL || sp[0] == dc && sp[1] == '\n') {
			pos = ftell(inf);
			length = pos - last_off - (sp ? strlen(sp) : 0);
			last_off = pos;
			if (!length)
				continue;
			add_offset(outf, pos);
			if (Tbl.str_longlen < length)
				Tbl.str_longlen = length;
			if (Tbl.str_shortlen > length)
				Tbl.str_shortlen = length;
			first = Oflag;
		}
		else if (first) {
			for (nsp = sp; !isalnum(*nsp); nsp++)
				continue;
			ALLOC(Firstch, Num_pts);
			fp = &Firstch[Num_pts - 1];
			if (Iflag && isupper(*nsp))
				fp->first = tolower(*nsp);
			else
				fp->first = *nsp;
			fp->pos = Seekpts[Num_pts - 1];
			first = FALSE;
		}
	} while (sp != NULL);

	/*
	 * write the tables in
	 */

	(void) fclose(inf);

	if (Oflag)
		do_order();
	else if (Rflag)
		randomize();

	if (Xflag)
		Tbl.str_flags |= STR_ROTATED;

	if (!Sflag) {
		printf("\"%s\" created\n", Outfile);
		if (Num_pts == 2)
			puts("There was 1 string");
		else
			printf("There were %d strings\n", Num_pts - 1);
		printf("Longest string: %lu byte%s\n", Tbl.str_longlen,
		       Tbl.str_longlen == 1 ? "" : "s");
		printf("Shortest string: %lu byte%s\n", Tbl.str_shortlen,
		       Tbl.str_shortlen == 1 ? "" : "s");
	}

	(void) fseek(outf, (off_t) 0, 0);
	Tbl.str_version = htonl(Tbl.str_version);
	Tbl.str_numstr = htonl(Num_pts - 1);
	Tbl.str_longlen = htonl(Tbl.str_longlen);
	Tbl.str_shortlen = htonl(Tbl.str_shortlen);
	Tbl.str_flags = htonl(Tbl.str_flags);
	(void) fwrite((char *) &Tbl, sizeof Tbl, 1, outf);
	if (STORING_PTRS) {
		for (p = Seekpts, cnt = Num_pts; cnt--; ++p)
			*p = htonl(*p);
		(void) fwrite((char *) Seekpts, sizeof *Seekpts, (int) Num_pts, outf);
	}
	(void) fclose(outf);
	exit(0);
}

/*
 *	This routine evaluates arguments from the command line
 */
getargs(argc, argv)
int	argc;
char	**argv;
{
	extern char	*optarg;
	extern int	optind;
	int	ch;

	while ((ch = getopt(argc, argv, "c:iorsx")) != EOF)
		switch(ch) {
		case 'c':			/* new delimiting char */
			Delimch = *optarg;
			if (!isascii(Delimch)) {
				printf("bad delimiting character: '\\%o\n'",
				       Delimch);
			}
			break;
		case 'i':			/* ignore case in ordering */
			Iflag++;
			break;
		case 'o':			/* order strings */
			Oflag++;
			break;
		case 'r':			/* randomize pointers */
			Rflag++;
			break;
		case 's':			/* silent */
			Sflag++;
			break;
		case 'x':			/* set the rotated bit */
			Xflag++;
			break;
		case '?':
		default:
			usage();
		}
	argv += optind;

	if (*argv) {
		Infile = *argv;
		if (*++argv)
			(void) strcpy(Outfile, *argv);
	}
	if (!Infile) {
		puts("No input file name");
		usage();
	}
	if (*Outfile == '\0') {
		(void) strcpy(Outfile, Infile);
		(void) strcat(Outfile, ".dat");
	}
}

usage()
{
	(void) fprintf(stderr,
	    "strfile [-iorsx] [-c char] sourcefile [datafile]\n");
	exit(1);
}

/*
 * add_offset:
 *	Add an offset to the list, or write it out, as appropriate.
 */
add_offset(fp, off)
FILE	*fp;
off_t	off;
{
	off_t net;

	if (!STORING_PTRS) {
		net = htonl(off);
		fwrite(&net, 1, sizeof net, fp);
	} else {
		ALLOC(Seekpts, Num_pts + 1);
		Seekpts[Num_pts] = off;
	}
	Num_pts++;
}

/*
 * do_order:
 *	Order the strings alphabetically (possibly ignoring case).
 */
do_order()
{
	register int	i;
	register off_t	*lp;
	register STR	*fp;
	extern int	cmp_str();

	Sort_1 = fopen(Infile, "r");
	Sort_2 = fopen(Infile, "r");
	qsort((char *) Firstch, (int) Tbl.str_numstr, sizeof *Firstch, cmp_str);
	i = Tbl.str_numstr;
	lp = Seekpts;
	fp = Firstch;
	while (i--)
		*lp++ = fp++->pos;
	(void) fclose(Sort_1);
	(void) fclose(Sort_2);
	Tbl.str_flags |= STR_ORDERED;
}

/*
 * cmp_str:
 *	Compare two strings in the file
 */
char *
unctrl(c)
char c;
{
	static char	buf[3];

	if (isprint(c)) {
		buf[0] = c;
		buf[1] = '\0';
	}
	else if (c == 0177) {
		buf[0] = '^';
		buf[1] = '?';
	}
	else {
		buf[0] = '^';
		buf[1] = c + 'A' - 1;
	}
	return buf;
}

cmp_str(p1, p2)
STR	*p1, *p2;
{
	register int	c1, c2;
	register int	n1, n2;

# define	SET_N(nf,ch)	(nf = (ch == '\n'))
# define	IS_END(ch,nf)	(ch == Delimch && nf)

	c1 = p1->first;
	c2 = p2->first;
	if (c1 != c2)
		return c1 - c2;

	(void) fseek(Sort_1, p1->pos, 0);
	(void) fseek(Sort_2, p2->pos, 0);

	n1 = FALSE;
	n2 = FALSE;
	while (!isalnum(c1 = getc(Sort_1)) && c1 != '\0')
		SET_N(n1, c1);
	while (!isalnum(c2 = getc(Sort_2)) && c2 != '\0')
		SET_N(n2, c2);

	while (!IS_END(c1, n1) && !IS_END(c2, n2)) {
		if (Iflag) {
			if (isupper(c1))
				c1 = tolower(c1);
			if (isupper(c2))
				c2 = tolower(c2);
		}
		if (c1 != c2)
			return c1 - c2;
		SET_N(n1, c1);
		SET_N(n2, c2);
		c1 = getc(Sort_1);
		c2 = getc(Sort_2);
	}
	if (IS_END(c1, n1))
		c1 = 0;
	if (IS_END(c2, n2))
		c2 = 0;
	return c1 - c2;
}

/*
 * randomize:
 *	Randomize the order of the string table.  We must be careful
 *	not to randomize across delimiter boundaries.  All
 *	randomization is done within each block.
 */
randomize()
{
	register int	cnt, i;
	register off_t	tmp;
	register off_t	*sp;
	extern time_t	time();

	srandom((int)(time((time_t *) NULL) + getpid()));

	Tbl.str_flags |= STR_RANDOM;
	cnt = Tbl.str_numstr;

	/*
	 * move things around randomly
	 */

	for (sp = Seekpts; cnt > 0; cnt--, sp++) {
		i = random() % cnt;
		tmp = sp[0];
		sp[0] = sp[i];
		sp[i] = tmp;
	}
}