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/*
* yow.c
*
* Print a quotation from Zippy the Pinhead.
* Qux <Kaufman-David@Yale> March 6, 1986
*
* With dynamic memory allocation.
*/
/* Synched up with: FSF 19.28. */
#define DONT_ENCAPSULATE
#include <config.h>
#include <stdio.h>
#include <ctype.h>
#include <../src/paths.h> /* For PATH_DATA. */
#if __STDC__ || defined(STDC_HEADERS)
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <time.h> /* for time() */
#endif
#define BUFSIZE 80
#define SEP '\0'
#ifndef YOW_FILE
#define YOW_FILE "yow.lines"
#endif
void yow (FILE *fp);
void setup_yow (FILE *fp);
#ifdef WIN32_NATIVE
#define rootrelativepath(rel) \
({\
static char res[BUFSIZE], *p;\
strcpy (res, argv[0]);\
p = res + strlen (res);\
while (p != res && *p != '/' && *p != '\\' && *p != ':') p--;\
strcpy (p + 1, "../");\
strcpy (p + 4, rel);\
&res;})
#endif
int
main (int argc, char *argv[])
{
FILE *fp;
char file[BUFSIZ];
if (argc > 2 && !strcmp (argv[1], "-f"))
strcpy (file, argv[2]);
else
#ifdef PATH_DATA
#ifdef vms
sprintf (file, "%s%s", PATH_DATA, YOW_FILE);
#else
sprintf (file, "%s/%s", PATH_DATA, YOW_FILE);
#endif
#else /* !PATH_DATA */
{
fprintf (stderr,
"%s: the location of the \"%s\" file was not supplied at compile-time.\n\
You must supply it with the -f command-line option.\n",
argv[0], YOW_FILE);
exit (1);
}
#endif
if ((fp = fopen(file, "r")) == NULL) {
perror(file);
exit(1);
}
/* initialize random seed */
srand((int) (getpid() + time((time_t *) 0)));
setup_yow(fp);
yow(fp);
fclose(fp);
return 0;
}
static long len = -1;
static long header_len;
#define AVG_LEN 40 /* average length of a quotation */
/* Sets len and header_len */
void
setup_yow (FILE *fp)
{
int c;
/* Get length of file */
/* Because the header (stuff before the first SEP) can be very long,
* thus biasing our search in favor of the first quotation in the file,
* we explicitly skip that. */
while ((c = getc(fp)) != SEP) {
if (c == EOF) {
fprintf(stderr, "File contains no separators.\n");
exit(2);
}
}
header_len = ftell(fp);
if (header_len > AVG_LEN)
header_len -= AVG_LEN; /* allow the first quotation to appear */
if (fseek(fp, 0L, 2) == -1) {
perror("fseek 1");
exit(1);
}
len = ftell(fp) - header_len;
}
/* go to a random place in the file and print the quotation there */
void
yow (FILE *fp)
{
long offset;
int c, i = 0;
char *buf;
int bufsize;
offset = rand() % len + header_len;
if (fseek(fp, offset, 0) == -1) {
perror("fseek 2");
exit(1);
}
/* Read until SEP, read next line, print it.
(Note that we will never print anything before the first separator.)
If we hit EOF looking for the first SEP, just recurse. */
while ((c = getc(fp)) != SEP)
if (c == EOF) {
yow(fp);
return;
}
/* Skip leading whitespace, then read in a quotation.
If we hit EOF before we find a non-whitespace char, recurse. */
while (isspace(c = getc(fp)))
;
if (c == EOF) {
yow(fp);
return;
}
bufsize = BUFSIZE;
buf = (char *) malloc(bufsize);
if (buf == (char *)0) {
fprintf(stderr, "can't allocate any memory\n");
exit (3);
}
buf[i++] = c;
while ((c = getc(fp)) != SEP && c != EOF) {
buf[i++] = c;
if (i == bufsize-1) {
/* Yow! Is this quotation too long yet? */
bufsize *= 2;
buf = (char *)realloc(buf, bufsize);
if (buf == (char *)0) {
fprintf(stderr, "can't allocate more memory\n");
exit (3);
}
}
}
buf[i++] = 0;
printf("%s\n", buf);
}
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