projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 9546bac0 WJ |
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 | } |