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fortune.c revision 1.1 
      1 /* fortune.c		 Larn is copyrighted 1986 by Noah Morgan. */
      2 #include <sys/types.h>
      3 #include <sys/stat.h>
      4 #include <fcntl.h>
      5 
      6 #include "header.h"
      7 /*
      8  *	function to return a random fortune from the fortune file
      9  */
     10 static char *base=0;	/* pointer to the fortune text */
     11 static char **flines=0;	/* array of pointers to each fortune */
     12 static int fd=0;		/* true if we have load the fortune info */
     13 static int nlines=0;	/* # lines in fortune database */
     14 
     15 char *fortune(file)
     16 	char *file;
     17 	{
     18 	register char *p;
     19 	register int lines,tmp;
     20 	struct stat stat;
     21 	char *malloc();
     22 	if (fd==0)
     23 		{
     24 		if ((fd=open(file,O_RDONLY)) < 0)	/* open the file */
     25 			return(0); /* can't find file */
     26 
     27 	/* find out how big fortune file is and get memory for it */
     28 		stat.st_size = 16384;
     29 		if ((fstat(fd,&stat) < 0) || ((base=malloc(1+stat.st_size)) == 0))
     30 			{
     31 			close(fd); fd= -1; free((char*)base); return(0); 	/* can't stat file */
     32 			}
     33 
     34 	/* read in the entire fortune file */
     35 		if (read(fd,base,stat.st_size) != stat.st_size)
     36 			{
     37 			close(fd); fd= -1; free((char*)base); return(0); 	/* can't read file */
     38 			}
     39 		close(fd);  base[stat.st_size]=0;	/* final NULL termination */
     40 
     41 	/* count up all the lines (and NULL terminate) to know memory needs */
     42 		for (p=base,lines=0; p<base+stat.st_size; p++) /* count lines */
     43 			if (*p == '\n') *p=0,lines++;
     44 		nlines = lines;
     45 
     46 	/* get memory for array of pointers to each fortune */
     47 		if ((flines=(char**)malloc(nlines*sizeof(char*))) == 0)
     48 			{
     49 			free((char*)base); fd= -1; return(0); /* malloc() failure */
     50 			}
     51 
     52 	/* now assign each pointer to a line */
     53 		for (p=base,tmp=0; tmp<nlines; tmp++)
     54 			{
     55 			flines[tmp]=p;  while (*p++); /* advance to next line */
     56 			}
     57 		}
     58 
     59 	if (fd > 2)	/* if we have a database to look at */
     60 		return(flines[rund((nlines<=0)?1:nlines)]);
     61 	else
     62 		return(0);
     63 	}
     64