xref: /freebsd/usr.bin/fortune/fortune/fortune.c (revision 0b8224d1)

/*-
 * Copyright (c) 1986, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Ken Arnold.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/stat.h>
#include <sys/endian.h>

#include <assert.h>
#include <ctype.h>
#include <dirent.h>
#include <fcntl.h>
#include <locale.h>
#include <regex.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

#include "strfile.h"
#include "pathnames.h"

#define	TRUE	true
#define	FALSE	false

#define	MINW	6		/* minimum wait if desired */
#define	CPERS	20		/* # of chars for each sec */
#define	SLEN	160		/* # of chars in short fortune */

#define	POS_UNKNOWN	((uint32_t) -1)	/* pos for file unknown */
#define	NO_PROB		(-1)		/* no prob specified for file */

#ifdef	DEBUG
#define	DPRINTF(l,x)	{ if (Debug >= l) fprintf x; }
#undef	NDEBUG
#else
#define	DPRINTF(l,x)
#define	NDEBUG	1
#endif

typedef struct fd {
	int		percent;
	int		fd, datfd;
	uint32_t	pos;
	FILE		*inf;
	const char	*name;
	const char	*path;
	char		*datfile, *posfile;
	bool		read_tbl;
	bool		was_pos_file;
	STRFILE		tbl;
	int		num_children;
	struct fd	*child, *parent;
	struct fd	*next, *prev;
} FILEDESC;

static bool	Found_one;		/* did we find a match? */
static bool	Find_files = FALSE;	/* just find a list of proper fortune files */
static bool	Fortunes_only = FALSE;	/* check only "fortunes" files */
static bool	Wait = FALSE;		/* wait desired after fortune */
static bool	Short_only = FALSE;	/* short fortune desired */
static bool	Long_only = FALSE;	/* long fortune desired */
static bool	Offend = FALSE;		/* offensive fortunes only */
static bool	All_forts = FALSE;	/* any fortune allowed */
static bool	Equal_probs = FALSE;	/* scatter un-allocted prob equally */
static bool	Match = FALSE;		/* dump fortunes matching a pattern */
static bool	WriteToDisk = false;	/* use files on disk to save state */
#ifdef DEBUG
static int	Debug = 0;		/* print debug messages */
#endif

static char	*Fortbuf = NULL;	/* fortune buffer for -m */

static int	Fort_len = 0;

static off_t	Seekpts[2];		/* seek pointers to fortunes */

static FILEDESC	*File_list = NULL,	/* Head of file list */
		*File_tail = NULL;	/* Tail of file list */
static FILEDESC	*Fortfile;		/* Fortune file to use */

static STRFILE	Noprob_tbl;		/* sum of data for all no prob files */

static const char *Fortune_path;
static char	**Fortune_path_arr;

static int	 add_dir(FILEDESC *);
static int	 add_file(int, const char *, const char *, FILEDESC **,
		     FILEDESC **, FILEDESC *);
static void	 all_forts(FILEDESC *, char *);
static char	*copy(const char *, u_int);
static void	 display(FILEDESC *);
static void	 do_free(void *);
static void	*do_malloc(u_int);
static int	 form_file_list(char **, int);
static int	 fortlen(void);
static void	 get_fort(void);
static void	 get_pos(FILEDESC *);
static void	 get_tbl(FILEDESC *);
static void	 getargs(int, char *[]);
static void	 getpath(void);
static void	 init_prob(void);
static int	 is_dir(const char *);
static int	 is_fortfile(const char *, char **, char **, int);
static int	 is_off_name(const char *);
static int	 max(int, int);
static FILEDESC *new_fp(void);
static char	*off_name(const char *);
static void	 open_dat(FILEDESC *);
static void	 open_fp(FILEDESC *);
static FILEDESC *pick_child(FILEDESC *);
static void	 print_file_list(void);
static void	 print_list(FILEDESC *, int);
static void	 sum_noprobs(FILEDESC *);
static void	 sum_tbl(STRFILE *, STRFILE *);
static void	 usage(void);
static void	 zero_tbl(STRFILE *);

static char	*conv_pat(char *);
static int	 find_matches(void);
static void	 matches_in_list(FILEDESC *);
static int	 maxlen_in_list(FILEDESC *);

static regex_t Re_pat;

int
main(int argc, char *argv[])
{
	int	fd;

	if (getenv("FORTUNE_SAVESTATE") != NULL)
		WriteToDisk = true;

	(void) setlocale(LC_ALL, "");

	getpath();
	getargs(argc, argv);

	if (Match)
		exit(find_matches() != 0);

	init_prob();
	do {
		get_fort();
	} while ((Short_only && fortlen() > SLEN) ||
		 (Long_only && fortlen() <= SLEN));

	display(Fortfile);

	if (WriteToDisk) {
		if ((fd = creat(Fortfile->posfile, 0666)) < 0) {
			perror(Fortfile->posfile);
			exit(1);
		}
		/*
		 * if we can, we exclusive lock, but since it isn't very
		 * important, we just punt if we don't have easy locking
		 * available.
		 */
		flock(fd, LOCK_EX);
		write(fd, (char *) &Fortfile->pos, sizeof Fortfile->pos);
		if (!Fortfile->was_pos_file)
		chmod(Fortfile->path, 0666);
		flock(fd, LOCK_UN);
	}
	if (Wait) {
		if (Fort_len == 0)
			(void) fortlen();
		sleep((unsigned int) max(Fort_len / CPERS, MINW));
	}

	exit(0);
}

static void
display(FILEDESC *fp)
{
	char   *p;
	unsigned char ch;
	char	line[BUFSIZ];

	open_fp(fp);
	fseeko(fp->inf, Seekpts[0], SEEK_SET);
	for (Fort_len = 0; fgets(line, sizeof line, fp->inf) != NULL &&
	    !STR_ENDSTRING(line, fp->tbl); Fort_len++) {
		if (fp->tbl.str_flags & STR_ROTATED)
			for (p = line; (ch = *p) != '\0'; ++p) {
				if (isascii(ch)) {
					if (isupper(ch))
						*p = 'A' + (ch - 'A' + 13) % 26;
					else if (islower(ch))
						*p = 'a' + (ch - 'a' + 13) % 26;
				}
			}
		if (fp->tbl.str_flags & STR_COMMENTS
		    && line[0] == fp->tbl.str_delim
		    && line[1] == fp->tbl.str_delim)
			continue;
		fputs(line, stdout);
	}
	(void) fflush(stdout);
}

/*
 * fortlen:
 *	Return the length of the fortune.
 */
static int
fortlen(void)
{
	int	nchar;
	char	line[BUFSIZ];

	if (!(Fortfile->tbl.str_flags & (STR_RANDOM | STR_ORDERED)))
		nchar = (int)(Seekpts[1] - Seekpts[0]);
	else {
		open_fp(Fortfile);
		fseeko(Fortfile->inf, Seekpts[0], SEEK_SET);
		nchar = 0;
		while (fgets(line, sizeof line, Fortfile->inf) != NULL &&
		       !STR_ENDSTRING(line, Fortfile->tbl))
			nchar += strlen(line);
	}
	Fort_len = nchar;

	return (nchar);
}

/*
 *	This routine evaluates the arguments on the command line
 */
static void
getargs(int argc, char *argv[])
{
	int	ignore_case;
	char	*pat;
	int ch;

	ignore_case = FALSE;
	pat = NULL;

#ifdef DEBUG
	while ((ch = getopt(argc, argv, "aDefilm:osw")) != -1)
#else
	while ((ch = getopt(argc, argv, "aefilm:osw")) != -1)
#endif /* DEBUG */
		switch(ch) {
		case 'a':		/* any fortune */
			All_forts = TRUE;
			break;
#ifdef DEBUG
		case 'D':
			Debug++;
			break;
#endif /* DEBUG */
		case 'e':		/* scatter un-allocted prob equally */
			Equal_probs = TRUE;
			break;
		case 'f':		/* find fortune files */
			Find_files = TRUE;
			break;
		case 'l':		/* long ones only */
			Long_only = TRUE;
			Short_only = FALSE;
			break;
		case 'o':		/* offensive ones only */
			Offend = TRUE;
			break;
		case 's':		/* short ones only */
			Short_only = TRUE;
			Long_only = FALSE;
			break;
		case 'w':		/* give time to read */
			Wait = TRUE;
			break;
		case 'm':			/* dump out the fortunes */
			Match = TRUE;
			pat = optarg;
			break;
		case 'i':			/* case-insensitive match */
			ignore_case++;
			break;
		case '?':
		default:
			usage();
		}
	argc -= optind;
	argv += optind;

	if (!form_file_list(argv, argc))
		exit(1);	/* errors printed through form_file_list() */
	if (Find_files) {
		print_file_list();
		exit(0);
	}
#ifdef DEBUG
	else if (Debug >= 1)
		print_file_list();
#endif /* DEBUG */

	if (pat != NULL) {
		int error;

		if (ignore_case)
			pat = conv_pat(pat);
		error = regcomp(&Re_pat, pat, REG_BASIC);
		if (error) {
			fprintf(stderr, "regcomp(%s) fails\n", pat);
			exit(1);
		}
	}
}

/*
 * form_file_list:
 *	Form the file list from the file specifications.
 */
static int
form_file_list(char **files, int file_cnt)
{
	int	i, percent;
	char	*sp;
	char	**pstr;

	if (file_cnt == 0) {
		if (Find_files) {
			Fortunes_only = TRUE;
			pstr = Fortune_path_arr;
			i = 0;
			while (*pstr) {
				i += add_file(NO_PROB, *pstr++, NULL,
					      &File_list, &File_tail, NULL);
			}
			Fortunes_only = FALSE;
			if (!i) {
				fprintf(stderr, "No fortunes found in %s.\n",
				    Fortune_path);
			}
			return (i != 0);
		} else {
			pstr = Fortune_path_arr;
			i = 0;
			while (*pstr) {
				i += add_file(NO_PROB, "fortunes", *pstr++,
					      &File_list, &File_tail, NULL);
			}
			if (!i) {
				fprintf(stderr, "No fortunes found in %s.\n",
				    Fortune_path);
			}
			return (i != 0);
		}
	}
	for (i = 0; i < file_cnt; i++) {
		percent = NO_PROB;
		if (!isdigit((unsigned char)files[i][0]))
			sp = files[i];
		else {
			percent = 0;
			for (sp = files[i]; isdigit((unsigned char)*sp); sp++) {
				percent = percent * 10 + *sp - '0';
				if (percent > 100) {
					fprintf(stderr, "percentages must be <= 100\n");
					return (FALSE);
				}
			}
			if (*sp == '.') {
				fprintf(stderr, "percentages must be integers\n");
				return (FALSE);
			}
			/*
			 * If the number isn't followed by a '%', then
			 * it was not a percentage, just the first part
			 * of a file name which starts with digits.
			 */
			if (*sp != '%') {
				percent = NO_PROB;
				sp = files[i];
			}
			else if (*++sp == '\0') {
				if (++i >= file_cnt) {
					fprintf(stderr, "percentages must precede files\n");
					return (FALSE);
				}
				sp = files[i];
			}
		}
		if (strcmp(sp, "all") == 0) {
			pstr = Fortune_path_arr;
			i = 0;
			while (*pstr) {
				i += add_file(NO_PROB, *pstr++, NULL,
					      &File_list, &File_tail, NULL);
			}
			if (!i) {
				fprintf(stderr, "No fortunes found in %s.\n",
				    Fortune_path);
				return (FALSE);
			}
		} else if (!add_file(percent, sp, NULL, &File_list,
				     &File_tail, NULL)) {
 			return (FALSE);
		}
	}

	return (TRUE);
}

/*
 * add_file:
 *	Add a file to the file list.
 */
static int
add_file(int percent, const char *file, const char *dir, FILEDESC **head,
    FILEDESC **tail, FILEDESC *parent)
{
	FILEDESC	*fp;
	int		fd;
	const char 	*path;
	char		*tpath, *offensive;
	bool		was_malloc;
	bool		isdir;

	if (dir == NULL) {
		path = file;
		tpath = NULL;
		was_malloc = FALSE;
	}
	else {
		tpath = do_malloc((unsigned int)(strlen(dir) + strlen(file) + 2));
		strcat(strcat(strcpy(tpath, dir), "/"), file);
		path = tpath;
		was_malloc = TRUE;
	}
	if ((isdir = is_dir(path)) && parent != NULL) {
		if (was_malloc)
			free(tpath);
		return (FALSE);	/* don't recurse */
	}
	offensive = NULL;
	if (!isdir && parent == NULL && (All_forts || Offend) &&
	    !is_off_name(path)) {
		offensive = off_name(path);
		if (Offend) {
			if (was_malloc)
				free(tpath);
			path = tpath = offensive;
			offensive = NULL;
			was_malloc = TRUE;
			DPRINTF(1, (stderr, "\ttrying \"%s\"\n", path));
			file = off_name(file);
		}
	}

	DPRINTF(1, (stderr, "adding file \"%s\"\n", path));
over:
	if ((fd = open(path, O_RDONLY)) < 0) {
		/*
		 * This is a sneak.  If the user said -a, and if the
		 * file we're given isn't a file, we check to see if
		 * there is a -o version.  If there is, we treat it as
		 * if *that* were the file given.  We only do this for
		 * individual files -- if we're scanning a directory,
		 * we'll pick up the -o file anyway.
		 */
		if (All_forts && offensive != NULL) {
			if (was_malloc)
				free(tpath);
			path = tpath = offensive;
			offensive = NULL;
			was_malloc = TRUE;
			DPRINTF(1, (stderr, "\ttrying \"%s\"\n", path));
			file = off_name(file);
			goto over;
		}
		if (dir == NULL && file[0] != '/') {
			int i = 0;
			char **pstr = Fortune_path_arr;

			while (*pstr) {
				i += add_file(percent, file, *pstr++,
					      head, tail, parent);
			}
			if (!i) {
				fprintf(stderr, "No '%s' found in %s.\n",
				    file, Fortune_path);
			}
			return (i != 0);
		}
		/*
		if (parent == NULL)
			perror(path);
		*/
		if (was_malloc)
			free(tpath);
		return (FALSE);
	}

	DPRINTF(2, (stderr, "path = \"%s\"\n", path));

	fp = new_fp();
	fp->fd = fd;
	fp->percent = percent;
	fp->name = file;
	fp->path = path;
	fp->parent = parent;

	if ((isdir && !add_dir(fp)) ||
	    (!isdir &&
	     !is_fortfile(path, &fp->datfile, &fp->posfile, (parent != NULL))))
	{
		if (parent == NULL)
			fprintf(stderr,
				"fortune:%s not a fortune file or directory\n",
				path);
		if (was_malloc)
			free(tpath);
		do_free(fp->datfile);
		do_free(fp->posfile);
		free(fp);
		do_free(offensive);
		return (FALSE);
	}
	/*
	 * If the user said -a, we need to make this node a pointer to
	 * both files, if there are two.  We don't need to do this if
	 * we are scanning a directory, since the scan will pick up the
	 * -o file anyway.
	 */
	if (All_forts && parent == NULL && !is_off_name(path))
		all_forts(fp, offensive);
	if (*head == NULL)
		*head = *tail = fp;
	else if (fp->percent == NO_PROB) {
		(*tail)->next = fp;
		fp->prev = *tail;
		*tail = fp;
	}
	else {
		(*head)->prev = fp;
		fp->next = *head;
		*head = fp;
	}
	if (WriteToDisk)
		fp->was_pos_file = (access(fp->posfile, W_OK) >= 0);

	return (TRUE);
}

/*
 * new_fp:
 *	Return a pointer to an initialized new FILEDESC.
 */
static FILEDESC *
new_fp(void)
{
	FILEDESC	*fp;

	fp = do_malloc(sizeof(*fp));
	fp->datfd = -1;
	fp->pos = POS_UNKNOWN;
	fp->inf = NULL;
	fp->fd = -1;
	fp->percent = NO_PROB;
	fp->read_tbl = FALSE;
	fp->next = NULL;
	fp->prev = NULL;
	fp->child = NULL;
	fp->parent = NULL;
	fp->datfile = NULL;
	fp->posfile = NULL;

	return (fp);
}

/*
 * off_name:
 *	Return a pointer to the offensive version of a file of this name.
 */
static char *
off_name(const char *file)
{
	char	*new;

	new = copy(file, (unsigned int) (strlen(file) + 2));

	return (strcat(new, "-o"));
}

/*
 * is_off_name:
 *	Is the file an offensive-style name?
 */
static int
is_off_name(const char *file)
{
	int	len;

	len = strlen(file);

	return (len >= 3 && file[len - 2] == '-' && file[len - 1] == 'o');
}

/*
 * all_forts:
 *	Modify a FILEDESC element to be the parent of two children if
 *	there are two children to be a parent of.
 */
static void
all_forts(FILEDESC *fp, char *offensive)
{
	char		*sp;
	FILEDESC	*scene, *obscene;
	int		fd;
	char		*datfile, *posfile;

	if (fp->child != NULL)	/* this is a directory, not a file */
		return;
	if (!is_fortfile(offensive, &datfile, &posfile, FALSE))
		return;
	if ((fd = open(offensive, O_RDONLY)) < 0)
		return;
	DPRINTF(1, (stderr, "adding \"%s\" because of -a\n", offensive));
	scene = new_fp();
	obscene = new_fp();
	*scene = *fp;

	fp->num_children = 2;
	fp->child = scene;
	scene->next = obscene;
	obscene->next = NULL;
	scene->child = obscene->child = NULL;
	scene->parent = obscene->parent = fp;

	fp->fd = -1;
	scene->percent = obscene->percent = NO_PROB;

	obscene->fd = fd;
	obscene->inf = NULL;
	obscene->path = offensive;
	if ((sp = strrchr(offensive, '/')) == NULL)
		obscene->name = offensive;
	else
		obscene->name = ++sp;
	obscene->datfile = datfile;
	obscene->posfile = posfile;
	obscene->read_tbl = false;
	if (WriteToDisk)
		obscene->was_pos_file = (access(obscene->posfile, W_OK) >= 0);
}

/*
 * add_dir:
 *	Add the contents of an entire directory.
 */
static int
add_dir(FILEDESC *fp)
{
	DIR		*dir;
	struct dirent	*dirent;
	FILEDESC	*tailp;
	char		*name;

	(void) close(fp->fd);
	fp->fd = -1;
	if ((dir = opendir(fp->path)) == NULL) {
		perror(fp->path);
		return (FALSE);
	}
	tailp = NULL;
	DPRINTF(1, (stderr, "adding dir \"%s\"\n", fp->path));
	fp->num_children = 0;
	while ((dirent = readdir(dir)) != NULL) {
		if (dirent->d_namlen == 0)
			continue;
		name = copy(dirent->d_name, dirent->d_namlen);
		if (add_file(NO_PROB, name, fp->path, &fp->child, &tailp, fp))
			fp->num_children++;
		else
			free(name);
	}
	if (fp->num_children == 0) {
		(void) fprintf(stderr,
		    "fortune: %s: No fortune files in directory.\n", fp->path);
		return (FALSE);
	}

	return (TRUE);
}

/*
 * is_dir:
 *	Return TRUE if the file is a directory, FALSE otherwise.
 */
static int
is_dir(const char *file)
{
	struct stat	sbuf;

	if (stat(file, &sbuf) < 0)
		return (FALSE);

	return (sbuf.st_mode & S_IFDIR);
}

/*
 * is_fortfile:
 *	Return TRUE if the file is a fortune database file.  We try and
 *	exclude files without reading them if possible to avoid
 *	overhead.  Files which start with ".", or which have "illegal"
 *	suffixes, as contained in suflist[], are ruled out.
 */
/* ARGSUSED */
static int
is_fortfile(const char *file, char **datp, char **posp, int check_for_offend)
{
	int	i;
	const char	*sp;
	char	*datfile;
	static const char *suflist[] = {
		/* list of "illegal" suffixes" */
		"dat", "pos", "c", "h", "p", "i", "f",
		"pas", "ftn", "ins.c", "ins,pas",
		"ins.ftn", "sml",
		NULL
	};

	DPRINTF(2, (stderr, "is_fortfile(%s) returns ", file));

	/*
	 * Preclude any -o files for offendable people, and any non -o
	 * files for completely offensive people.
	 */
	if (check_for_offend && !All_forts) {
		i = strlen(file);
		if (Offend ^ (file[i - 2] == '-' && file[i - 1] == 'o')) {
			DPRINTF(2, (stderr, "FALSE (offending file)\n"));
			return (FALSE);
		}
	}

	if ((sp = strrchr(file, '/')) == NULL)
		sp = file;
	else
		sp++;
	if (*sp == '.') {
		DPRINTF(2, (stderr, "FALSE (file starts with '.')\n"));
		return (FALSE);
	}
	if (Fortunes_only && strncmp(sp, "fortunes", 8) != 0) {
		DPRINTF(2, (stderr, "FALSE (check fortunes only)\n"));
		return (FALSE);
	}
	if ((sp = strrchr(sp, '.')) != NULL) {
		sp++;
		for (i = 0; suflist[i] != NULL; i++)
			if (strcmp(sp, suflist[i]) == 0) {
				DPRINTF(2, (stderr, "FALSE (file has suffix \".%s\")\n", sp));
				return (FALSE);
			}
	}

	datfile = copy(file, (unsigned int) (strlen(file) + 4)); /* +4 for ".dat" */
	strcat(datfile, ".dat");
	if (access(datfile, R_OK) < 0) {
		DPRINTF(2, (stderr, "FALSE (no readable \".dat\" file)\n"));
		free(datfile);
		return (FALSE);
	}
	if (datp != NULL)
		*datp = datfile;
	else
		free(datfile);
	if (posp != NULL) {
		if (WriteToDisk) {
			*posp = copy(file, (unsigned int) (strlen(file) + 4)); /* +4 for ".dat" */
			strcat(*posp, ".pos");
		}
		else {
			*posp = NULL;
		}
	}
	DPRINTF(2, (stderr, "TRUE\n"));

	return (TRUE);
}

/*
 * copy:
 *	Return a malloc()'ed copy of the string
 */
static char *
copy(const char *str, unsigned int len)
{
	char *new, *sp;

	new = do_malloc(len + 1);
	sp = new;
	do {
		*sp++ = *str;
	} while (*str++);

	return (new);
}

/*
 * do_malloc:
 *	Do a malloc, checking for NULL return.
 */
static void *
do_malloc(unsigned int size)
{
	void *new;

	if ((new = malloc(size)) == NULL) {
		(void) fprintf(stderr, "fortune: out of memory.\n");
		exit(1);
	}

	return (new);
}

/*
 * do_free:
 *	Free malloc'ed space, if any.
 */
static void
do_free(void *ptr)
{
	if (ptr != NULL)
		free(ptr);
}

/*
 * init_prob:
 *	Initialize the fortune probabilities.
 */
static void
init_prob(void)
{
	FILEDESC       *fp, *last = NULL;
	int		percent, num_noprob, frac;

	/*
	 * Distribute the residual probability (if any) across all
	 * files with unspecified probability (i.e., probability of 0)
	 * (if any).
	 */

	percent = 0;
	num_noprob = 0;
	for (fp = File_tail; fp != NULL; fp = fp->prev)
		if (fp->percent == NO_PROB) {
			num_noprob++;
			if (Equal_probs)
				last = fp;
		} else
			percent += fp->percent;
	DPRINTF(1, (stderr, "summing probabilities:%d%% with %d NO_PROB's",
		    percent, num_noprob));
	if (percent > 100) {
		(void) fprintf(stderr,
		    "fortune: probabilities sum to %d%% > 100%%!\n", percent);
		exit(1);
	} else if (percent < 100 && num_noprob == 0) {
		(void) fprintf(stderr,
		    "fortune: no place to put residual probability (%d%% < 100%%)\n",
		    percent);
		exit(1);
	} else if (percent == 100 && num_noprob != 0) {
		(void) fprintf(stderr,
		    "fortune: no probability left to put in residual files (100%%)\n");
		exit(1);
	}
	percent = 100 - percent;
	if (Equal_probs) {
		if (num_noprob != 0) {
			if (num_noprob > 1) {
				frac = percent / num_noprob;
				DPRINTF(1, (stderr, ", frac = %d%%", frac));
				for (fp = File_tail; fp != last; fp = fp->prev)
					if (fp->percent == NO_PROB) {
						fp->percent = frac;
						percent -= frac;
					}
			}
			last->percent = percent;
			DPRINTF(1, (stderr, ", residual = %d%%", percent));
		}
		else
		DPRINTF(1, (stderr,
			    ", %d%% distributed over remaining fortunes\n",
			    percent));
	}
	DPRINTF(1, (stderr, "\n"));

#ifdef DEBUG
	if (Debug >= 1)
		print_file_list();
#endif
}

/*
 * get_fort:
 *	Get the fortune data file's seek pointer for the next fortune.
 */
static void
get_fort(void)
{
	FILEDESC	*fp;
	int		choice;

	if (File_list->next == NULL || File_list->percent == NO_PROB)
		fp = File_list;
	else {
		choice = arc4random_uniform(100);
		DPRINTF(1, (stderr, "choice = %d\n", choice));
		for (fp = File_list; fp->percent != NO_PROB; fp = fp->next) {
			if (choice < fp->percent)
				break;
			else {
				choice -= fp->percent;
				DPRINTF(1, (stderr,
					    "    skip \"%s\", %d%% (choice = %d)\n",
					    fp->name, fp->percent, choice));
			}
		}
		DPRINTF(1, (stderr,
			    "using \"%s\", %d%% (choice = %d)\n",
			    fp->name, fp->percent, choice));
	}
	if (fp->percent != NO_PROB)
		get_tbl(fp);
	else {
		if (fp->next != NULL) {
			sum_noprobs(fp);
			choice = arc4random_uniform(Noprob_tbl.str_numstr);
			DPRINTF(1, (stderr, "choice = %d (of %u) \n", choice,
				    Noprob_tbl.str_numstr));
			while ((unsigned int)choice >= fp->tbl.str_numstr) {
				choice -= fp->tbl.str_numstr;
				fp = fp->next;
				DPRINTF(1, (stderr,
					    "    skip \"%s\", %u (choice = %d)\n",
					    fp->name, fp->tbl.str_numstr,
					    choice));
			}
			DPRINTF(1, (stderr, "using \"%s\", %u\n", fp->name,
				    fp->tbl.str_numstr));
		}
		get_tbl(fp);
	}
	if (fp->child != NULL) {
		DPRINTF(1, (stderr, "picking child\n"));
		fp = pick_child(fp);
	}
	Fortfile = fp;
	get_pos(fp);
	open_dat(fp);
	lseek(fp->datfd,
	    (off_t) (sizeof fp->tbl + fp->pos * sizeof Seekpts[0]), SEEK_SET);
	read(fp->datfd, Seekpts, sizeof Seekpts);
	Seekpts[0] = be64toh(Seekpts[0]);
	Seekpts[1] = be64toh(Seekpts[1]);
}

/*
 * pick_child
 *	Pick a child from a chosen parent.
 */
static FILEDESC *
pick_child(FILEDESC *parent)
{
	FILEDESC	*fp;
	int		choice;

	if (Equal_probs) {
		choice = arc4random_uniform(parent->num_children);
		DPRINTF(1, (stderr, "    choice = %d (of %d)\n",
			    choice, parent->num_children));
		for (fp = parent->child; choice--; fp = fp->next)
			continue;
		DPRINTF(1, (stderr, "    using %s\n", fp->name));
		return (fp);
	}
	else {
		get_tbl(parent);
		choice = arc4random_uniform(parent->tbl.str_numstr);
		DPRINTF(1, (stderr, "    choice = %d (of %u)\n",
			    choice, parent->tbl.str_numstr));
		for (fp = parent->child; (unsigned)choice >= fp->tbl.str_numstr;
		     fp = fp->next) {
			choice -= fp->tbl.str_numstr;
			DPRINTF(1, (stderr, "\tskip %s, %u (choice = %d)\n",
				    fp->name, fp->tbl.str_numstr, choice));
		}
		DPRINTF(1, (stderr, "    using %s, %u\n", fp->name,
			    fp->tbl.str_numstr));
		return (fp);
	}
}

/*
 * sum_noprobs:
 *	Sum up all the noprob probabilities, starting with fp.
 */
static void
sum_noprobs(FILEDESC *fp)
{
	static bool	did_noprobs = FALSE;

	if (did_noprobs)
		return;
	zero_tbl(&Noprob_tbl);
	while (fp != NULL) {
		get_tbl(fp);
		sum_tbl(&Noprob_tbl, &fp->tbl);
		fp = fp->next;
	}
	did_noprobs = TRUE;
}

static int
max(int i, int j)
{
	return (i >= j ? i : j);
}

/*
 * open_fp:
 *	Assocatiate a FILE * with the given FILEDESC.
 */
static void
open_fp(FILEDESC *fp)
{
	if (fp->inf == NULL && (fp->inf = fdopen(fp->fd, "r")) == NULL) {
		perror(fp->path);
		exit(1);
	}
}

/*
 * open_dat:
 *	Open up the dat file if we need to.
 */
static void
open_dat(FILEDESC *fp)
{
	if (fp->datfd < 0 && (fp->datfd = open(fp->datfile, O_RDONLY)) < 0) {
		perror(fp->datfile);
		exit(1);
	}
}

/*
 * get_pos:
 *	Get the position from the pos file, if there is one.  If not,
 *	return a random number.
 */
static void
get_pos(FILEDESC *fp)
{
	int	fd;

	assert(fp->read_tbl);
	if (fp->pos == POS_UNKNOWN) {
		if (WriteToDisk) {
			if ((fd = open(fp->posfile, O_RDONLY)) < 0 ||
			    read(fd, &fp->pos, sizeof fp->pos) != sizeof fp->pos)
				fp->pos = arc4random_uniform(fp->tbl.str_numstr);
			else if (fp->pos >= fp->tbl.str_numstr)
				fp->pos %= fp->tbl.str_numstr;
			if (fd >= 0)
				close(fd);
		}
		else
			fp->pos = arc4random_uniform(fp->tbl.str_numstr);
	}
	if (++(fp->pos) >= fp->tbl.str_numstr)
		fp->pos -= fp->tbl.str_numstr;
	DPRINTF(1, (stderr, "pos for %s is %ld\n", fp->name, (long)fp->pos));
}

/*
 * get_tbl:
 *	Get the tbl data file the datfile.
 */
static void
get_tbl(FILEDESC *fp)
{
	int		fd;
	FILEDESC	*child;

	if (fp->read_tbl)
		return;
	if (fp->child == NULL) {
		if ((fd = open(fp->datfile, O_RDONLY)) < 0) {
			perror(fp->datfile);
			exit(1);
		}
		if (read(fd, (char *) &fp->tbl, sizeof fp->tbl) != sizeof fp->tbl) {
			(void)fprintf(stderr,
			    "fortune: %s corrupted\n", fp->path);
			exit(1);
		}
		/* fp->tbl.str_version = be32toh(fp->tbl.str_version); */
		fp->tbl.str_numstr = be32toh(fp->tbl.str_numstr);
		fp->tbl.str_longlen = be32toh(fp->tbl.str_longlen);
		fp->tbl.str_shortlen = be32toh(fp->tbl.str_shortlen);
		fp->tbl.str_flags = be32toh(fp->tbl.str_flags);
		(void) close(fd);
	}
	else {
		zero_tbl(&fp->tbl);
		for (child = fp->child; child != NULL; child = child->next) {
			get_tbl(child);
			sum_tbl(&fp->tbl, &child->tbl);
		}
	}
	fp->read_tbl = TRUE;
}

/*
 * zero_tbl:
 *	Zero out the fields we care about in a tbl structure.
 */
static void
zero_tbl(STRFILE *tp)
{
	tp->str_numstr = 0;
	tp->str_longlen = 0;
	tp->str_shortlen = ~0;
}

/*
 * sum_tbl:
 *	Merge the tbl data of t2 into t1.
 */
static void
sum_tbl(STRFILE *t1, STRFILE *t2)
{
	t1->str_numstr += t2->str_numstr;
	if (t1->str_longlen < t2->str_longlen)
		t1->str_longlen = t2->str_longlen;
	if (t1->str_shortlen > t2->str_shortlen)
		t1->str_shortlen = t2->str_shortlen;
}

#define	STR(str)	((str) == NULL ? "NULL" : (str))

/*
 * print_file_list:
 *	Print out the file list
 */
static void
print_file_list(void)
{
	print_list(File_list, 0);
}

/*
 * print_list:
 *	Print out the actual list, recursively.
 */
static void
print_list(FILEDESC *list, int lev)
{
	while (list != NULL) {
		fprintf(stderr, "%*s", lev * 4, "");
		if (list->percent == NO_PROB)
			fprintf(stderr, "___%%");
		else
			fprintf(stderr, "%3d%%", list->percent);
		fprintf(stderr, " %s", STR(list->name));
		DPRINTF(1, (stderr, " (%s, %s, %s)", STR(list->path),
			    STR(list->datfile), STR(list->posfile)));
		fprintf(stderr, "\n");
		if (list->child != NULL)
			print_list(list->child, lev + 1);
		list = list->next;
	}
}

/*
 * conv_pat:
 *	Convert the pattern to an ignore-case equivalent.
 */
static char *
conv_pat(char *orig)
{
	char		*sp;
	unsigned int	cnt;
	char		*new;

	cnt = 1;	/* allow for '\0' */
	for (sp = orig; *sp != '\0'; sp++)
		if (isalpha((unsigned char)*sp))
			cnt += 4;
		else
			cnt++;
	if ((new = malloc(cnt)) == NULL) {
		fprintf(stderr, "pattern too long for ignoring case\n");
		exit(1);
	}

	for (sp = new; *orig != '\0'; orig++) {
		if (islower((unsigned char)*orig)) {
			*sp++ = '[';
			*sp++ = *orig;
			*sp++ = toupper((unsigned char)*orig);
			*sp++ = ']';
		}
		else if (isupper((unsigned char)*orig)) {
			*sp++ = '[';
			*sp++ = *orig;
			*sp++ = tolower((unsigned char)*orig);
			*sp++ = ']';
		}
		else
			*sp++ = *orig;
	}
	*sp = '\0';

	return (new);
}

/*
 * find_matches:
 *	Find all the fortunes which match the pattern we've been given.
 */
static int
find_matches(void)
{
	Fort_len = maxlen_in_list(File_list);
	DPRINTF(2, (stderr, "Maximum length is %d\n", Fort_len));
	/* extra length, "%\n" is appended */
	Fortbuf = do_malloc((unsigned int) Fort_len + 10);

	Found_one = FALSE;
	matches_in_list(File_list);

	return (Found_one);
}

/*
 * maxlen_in_list
 *	Return the maximum fortune len in the file list.
 */
static int
maxlen_in_list(FILEDESC *list)
{
	FILEDESC	*fp;
	int		len, maxlen;

	maxlen = 0;
	for (fp = list; fp != NULL; fp = fp->next) {
		if (fp->child != NULL) {
			if ((len = maxlen_in_list(fp->child)) > maxlen)
				maxlen = len;
		}
		else {
			get_tbl(fp);
			if (fp->tbl.str_longlen > (unsigned int)maxlen)
				maxlen = fp->tbl.str_longlen;
		}
	}

	return (maxlen);
}

/*
 * matches_in_list
 *	Print out the matches from the files in the list.
 */
static void
matches_in_list(FILEDESC *list)
{
	char           *sp, *p;
	FILEDESC	*fp;
	int		in_file;
	unsigned char	ch;

	for (fp = list; fp != NULL; fp = fp->next) {
		if (fp->child != NULL) {
			matches_in_list(fp->child);
			continue;
		}
		DPRINTF(1, (stderr, "searching in %s\n", fp->path));
		open_fp(fp);
		sp = Fortbuf;
		in_file = FALSE;
		while (fgets(sp, Fort_len, fp->inf) != NULL)
			if (fp->tbl.str_flags & STR_COMMENTS
			    && sp[0] == fp->tbl.str_delim
			    && sp[1] == fp->tbl.str_delim)
				continue;
			else if (!STR_ENDSTRING(sp, fp->tbl))
				sp += strlen(sp);
			else {
				*sp = '\0';
				if (fp->tbl.str_flags & STR_ROTATED)
					for (p = Fortbuf; (ch = *p) != '\0'; ++p) {
						if (isascii(ch)) {
							if (isupper(ch))
								*p = 'A' + (ch - 'A' + 13) % 26;
							else if (islower(ch))
								*p = 'a' + (ch - 'a' + 13) % 26;
						}
					}
				if (regexec(&Re_pat, Fortbuf, 0, NULL, 0) != REG_NOMATCH) {
					printf("%c%c", fp->tbl.str_delim,
					    fp->tbl.str_delim);
					if (!in_file) {
						printf(" (%s)", fp->name);
						Found_one = TRUE;
						in_file = TRUE;
					}
					putchar('\n');
					(void) fwrite(Fortbuf, 1, (sp - Fortbuf), stdout);
				}
				sp = Fortbuf;
			}
	}
}

static void
usage(void)
{
	(void) fprintf(stderr, "fortune [-a");
#ifdef	DEBUG
	(void) fprintf(stderr, "D");
#endif	/* DEBUG */
	(void) fprintf(stderr, "efilosw]");
	(void) fprintf(stderr, " [-m pattern]");
	(void) fprintf(stderr, " [[N%%] file/directory/all]\n");
	exit(1);
}

/*
 * getpath
 * 	Set up file search path from environment var FORTUNE_PATH;
 *	if not set, use the compiled in FORTDIR.
 */

static void
getpath(void)
{
	int	nstr, foundenv;
	char	*pch, **ppch, *str, *path;

	foundenv = 1;
	Fortune_path = getenv("FORTUNE_PATH");
	if (Fortune_path == NULL) {
		Fortune_path = FORTDIR;
		foundenv = 0;
	}
	path = strdup(Fortune_path);

	for (nstr = 2, pch = path; *pch != '\0'; pch++) {
		if (*pch == ':')
			nstr++;
	}

	ppch = Fortune_path_arr = (char **)calloc(nstr, sizeof(char *));

	nstr = 0;
	str = strtok(path, ":");
	while (str) {
		if (is_dir(str)) {
			nstr++;
			*ppch++ = str;
		}
		str = strtok(NULL, ":");
	}

	if (nstr == 0) {
		if (foundenv == 1) {
			fprintf(stderr,
			    "fortune: FORTUNE_PATH: None of the specified "
			    "directories found.\n");
			exit(1);
		}
		free(path);
		Fortune_path_arr[0] = strdup(FORTDIR);
	}
}