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