-#include <stdio.h>
-#include <ctype.h>
-#include "../src/paths.h"
-
-/* zippy.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.
*/
-#define BUFSIZE 2000
+#include <stdio.h>
+#include <ctype.h>
+#include <../src/paths.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
+
+char *malloc(), *realloc();
+
+void yow();
+void setup_yow();
+
+int
main (argc, argv)
int argc;
char *argv[];
{
FILE *fp;
char file[BUFSIZ];
- void yow();
if (argc > 2 && !strcmp (argv[1], "-f"))
strcpy (file, argv[2]);
else
#ifdef vms
- sprintf (file, "%s%s", PATH_EXEC, YOW_FILE);
+ sprintf (file, "%s%s", PATH_DATA, YOW_FILE);
#else
- sprintf (file, "%s/%s", PATH_EXEC, YOW_FILE);
+ sprintf (file, "%s/%s", PATH_DATA, YOW_FILE);
#endif
if ((fp = fopen(file, "r")) == NULL) {
+ fprintf(stderr, "yow: ");
perror(file);
exit(1);
}
/* initialize random seed */
srand((int) (getpid() + time((long *) 0)));
+ setup_yow(fp);
yow(fp);
fclose(fp);
- exit(0);
+ 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(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(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("yow");
+ exit(1);
+ }
+ len = ftell(fp) - header_len;
+}
+
+
+/* go to a random place in the file and print the quotation there */
void
yow (fp)
FILE *fp;
{
- static long len = -1;
long offset;
int c, i = 0;
- char buf[BUFSIZE];
+ char *buf;
+ unsigned int bufsize;
- /* Get length of file, go to a random place in it */
- if (len == -1) {
- if (fseek(fp, 0, 2) == -1) {
- perror("fseek 1");
- exit(1);
- }
- len = ftell(fp);
- }
- offset = rand() % len;
+ offset = rand() % len + header_len;
if (fseek(fp, offset, 0) == -1) {
- perror("fseek 2");
+ perror("yow");
exit(1);
}
/* Read until SEP, read next line, print it.
- (Note that we will never print anything before the first seperator.)
+ (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;
}
+
+ bufsize = BUFSIZE;
+ buf = malloc(bufsize);
+ if (buf == (char *)0) {
+ fprintf(stderr, "yow: virtual memory exhausted\n");
+ exit (3);
+ }
+
buf[i++] = c;
while ((c = getc(fp)) != SEP && c != EOF) {
buf[i++] = c;
-
- if (i == BUFSIZ-1)
+
+ if (i == bufsize-1) {
/* Yow! Is this quotation too long yet? */
- break;
+ bufsize *= 2;
+ buf = realloc(buf, bufsize);
+ if (buf == (char *)0) {
+ fprintf(stderr, "yow: virtual memory exhausted\n");
+ exit (3);
+ }
+ }
}
buf[i++] = 0;
printf("%s\n", buf);