ported from Mess-DOS to Minix

fortune/fortune.c

@@ -0,0 +1,156 @@
+/*
+ *	Fortune -- Print one fortune out of an indexed fortune file
+ */
+
+static char fortune_c_rcsid[] = "$Id: fortune.c,v 3.3 1992-03-24 11:15:45 hjp Exp $";
+
+#include <errno.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <ant/io.h>
+#include <ant/string.h>
+
+/*	The following parameters will have to be adapted to your system	*/
+#define DELIMITER	"%%\n"
+#define MAXLINE		(80 + 1 + 1)
+char * fortunefile	= "/usr/lib/fortune.dat";
+char indexfile [PATH_MAX] = "/usr/lib/fortune.idx";
+/*	The rest should be generic	*/
+
+	int
+main(
+	int argc,
+	char **argv
+){
+	FILE 		* ffp, * ifp;
+	char		* p;
+	long		pos,
+			cnt,		/* Number of fortunes in the file
+					 */
+			nr,		/* number of fortune to read	*/
+			fortune_time;	/* time the fortune file was last
+					 * updated.
+					 */
+	struct stat	statbuf;
+	char		line [MAXLINE];
+
+	if (argc >= 2){
+		fortunefile = argv [1];
+		strncpy (indexfile, argv [1], PATH_MAX);
+		if (p = strrchr (indexfile, '.')) {
+			strcpy (p, ".idx");
+		} else {
+			strcat (indexfile, ".idx");
+		}
+	}
+#ifdef DEBUG
+	printf ("fortunefile = \"%s\"\n", fortunefile);
+	printf ("indexfile   = \"%s\"\n", indexfile);
+#endif /* DEBUG */
+
+	/*	First check if index file is younger than fortune file
+	 *	and rebuild it if necessary.
+	 */
+
+	if (stat (fortunefile, &statbuf) < 0) {
+		eprintf ("%s: Cannot stat \"%s\": %s",
+			argv [0], fortunefile, strerror (errno));
+		exit (1);
+	}
+	fortune_time = statbuf.st_mtime;
+	if (stat (indexfile, &statbuf) < 0) {
+		/*	Index file does not exit -- force its creation
+		 *	and pretend it is older than fortune file
+		 */
+
+		if ((ifp = fopen (indexfile, "wb")) == NULL) {
+			eprintf ("%s: Cannot fopen \"%s\": %s",
+				argv [0], indexfile, strerror (errno));
+			exit (3);
+		}
+		fclose (ifp);
+		statbuf.st_mtime = 0;
+	}
+	if (statbuf.st_mtime < fortune_time) {
+		/*	Index file does either not exist or is older
+		 *	than fortune file.
+		 */
+
+		if ((ffp = fopen (fortunefile, "r")) == NULL) {
+			eprintf ("%s: Cannot fopen \"%s\": %s",
+				argv [0], fortunefile, strerror (errno));
+			exit (2);
+		}
+		if ((ifp = fopen (indexfile, "r+b")) == NULL) {
+			eprintf ("%s: Cannot fopen \"%s\": %s",
+				argv [0], indexfile, strerror (errno));
+			exit (3);
+		}
+		cnt = 0;
+		fwrite (&cnt, sizeof (long), 1, ifp);
+		fseek (ifp, sizeof (long), SEEK_CUR); /* leave position	intact */
+		while (fgets (line, sizeof (line), ffp)) {
+			if (STREQ (line, DELIMITER)) {
+				pos = ftell (ffp);
+				fwrite (&pos, sizeof (long), 1, ifp);
+				++ cnt;
+			}
+		}
+		fseek (ifp, 0, SEEK_SET);
+		fwrite (&cnt, sizeof (long), 1, ifp);
+		fclose (ifp);
+		fclose (ffp);
+	}
+
+	/* Now that we have a valid index file, open it and choose a fortune
+	 */
+
+	if ((ifp = fopen (indexfile, "r+b")) == NULL) {
+		eprintf ("%s: Cannot fopen \"%s\": %s",
+			argv [0], indexfile, strerror (errno));
+		exit (4);
+	}
+
+	if ((ffp = fopen (fortunefile, "r")) == NULL) {
+		eprintf ("%s: Cannot fopen \"%s\": %s",
+			argv [0], fortunefile, strerror (errno));
+		exit (5);
+	}
+
+	/*	Get number of entries	*/
+	fread (&cnt, sizeof (long), 1, ifp);
+
+	if (cnt == 0) {
+		eprintf ("%s: empty fortune file\n", argv [0]);
+		exit (6);
+	}
+
+	fseek (ifp, sizeof (long), SEEK_SET);
+	fread (&nr, sizeof (long), 1, ifp);
+	nr ++;
+	if (nr >= cnt) nr = 0;
+	fseek (ifp, sizeof (long), SEEK_SET);
+	fwrite (&nr, sizeof (long), 1, ifp);
+
+	/* Now look for the start of the fortune in the index file	*/
+	fseek (ifp, (nr + 2) * sizeof (long), SEEK_SET);
+	fread (&pos, sizeof (long), 1, ifp);
+
+	/* And seek to it in the fortune file	*/
+	fseek (ffp, pos, SEEK_SET);
+
+	/* write one fortune	*/
+	while (fgets (line, sizeof (line), ffp) && ! STREQ (line, DELIMITER)) {
+		fputs (line, stdout);
+	}
+	fclose (ifp);
+	fclose (ffp);
+	return 0;
+}