mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-12-05 08:53:45 +00:00
7235a58f70
(yow): Use EXIT_FAILURE in case of memory error.
185 lines
3.7 KiB
C
185 lines
3.7 KiB
C
/*
|
|
* yow.c
|
|
*
|
|
* Print a quotation from Zippy the Pinhead.
|
|
* Qux <Kaufman-David@Yale> March 6, 1986
|
|
*
|
|
* This file is in the public domain because the author published it
|
|
* with no copyright notice before the US signed the Bern Convention.
|
|
*
|
|
* With dynamic memory allocation.
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include <config.h>
|
|
#endif
|
|
|
|
#include <stdio.h>
|
|
#include <ctype.h>
|
|
#ifdef TIME_WITH_SYS_TIME
|
|
#include <sys/time.h>
|
|
#include <time.h>
|
|
#else
|
|
#ifdef HAVE_SYS_TIME_H
|
|
#include <sys/time.h>
|
|
#else
|
|
#include <time.h>
|
|
#endif
|
|
#endif
|
|
#ifdef HAVE_UNISTD_H
|
|
#include <unistd.h>
|
|
#endif
|
|
#include "epaths.h" /* For PATH_DATA. */
|
|
|
|
#define BUFSIZE 80
|
|
#define SEP '\0'
|
|
|
|
#ifndef YOW_FILE
|
|
#define YOW_FILE "yow.lines"
|
|
#endif
|
|
|
|
#ifdef MSDOS
|
|
#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
|
|
|
|
void yow();
|
|
void setup_yow();
|
|
|
|
int
|
|
main (argc, argv)
|
|
int argc;
|
|
char *argv[];
|
|
{
|
|
FILE *fp;
|
|
char file[BUFSIZ];
|
|
|
|
if (argc > 2 && !strcmp (argv[1], "-f"))
|
|
strcpy (file, argv[2]);
|
|
else
|
|
#ifdef vms
|
|
sprintf (file, "%s%s", PATH_DATA, YOW_FILE);
|
|
#else
|
|
sprintf (file, "%s/%s", PATH_DATA, YOW_FILE);
|
|
#endif
|
|
|
|
if ((fp = fopen(file, "r")) == NULL) {
|
|
fprintf(stderr, "yow: ");
|
|
perror(file);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
/* initialize random seed */
|
|
srand((int) (getpid() + time((time_t *) 0)));
|
|
|
|
setup_yow(fp);
|
|
yow(fp);
|
|
fclose(fp);
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
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(fp)
|
|
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, "yow: file contains no separators\n");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
}
|
|
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("yow");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
len = ftell(fp) - header_len;
|
|
}
|
|
|
|
|
|
/* go to a random place in the file and print the quotation there */
|
|
void
|
|
yow (fp)
|
|
FILE *fp;
|
|
{
|
|
long offset;
|
|
int c, i = 0;
|
|
char *buf;
|
|
unsigned int bufsize;
|
|
|
|
offset = rand() % len + header_len;
|
|
if (fseek(fp, offset, 0) == -1) {
|
|
perror("yow");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
/* 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, "yow: virtual memory exhausted\n");
|
|
exit (EXIT_FAILURE);
|
|
}
|
|
|
|
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, "yow: virtual memory exhausted\n");
|
|
exit (EXIT_FAILURE);
|
|
}
|
|
}
|
|
}
|
|
buf[i++] = 0;
|
|
printf("%s\n", buf);
|
|
}
|
|
|
|
/* arch-tag: e40fc0df-bafb-4001-af24-5c883d1c685e
|
|
(do not change this comment) */
|
|
|
|
/* yow.c ends here */
|