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