Commit | Line | Data |
---|---|---|
701570d7 RS |
1 | /* |
2 | * yow.c | |
177c0ea7 | 3 | * |
bc851190 RS |
4 | * Print a quotation from Zippy the Pinhead. |
5 | * Qux <Kaufman-David@Yale> March 6, 1986 | |
c76d4b42 RS |
6 | * |
7 | * This file is in the public domain because the author published it | |
8 | * with no copyright notice before the US signed the Bern Convention. | |
177c0ea7 | 9 | * |
701570d7 | 10 | * With dynamic memory allocation. |
bc851190 RS |
11 | */ |
12 | ||
2f8fe2f4 PJ |
13 | #ifdef HAVE_CONFIG_H |
14 | #include <config.h> | |
15 | #endif | |
16 | ||
701570d7 RS |
17 | #include <stdio.h> |
18 | #include <ctype.h> | |
076a0ff7 DL |
19 | #ifdef TIME_WITH_SYS_TIME |
20 | #include <sys/time.h> | |
21 | #include <time.h> | |
22 | #else | |
23 | #ifdef HAVE_SYS_TIME_H | |
24 | #include <sys/time.h> | |
25 | #else | |
26 | #include <time.h> | |
27 | #endif | |
28 | #endif | |
29 | #ifdef HAVE_UNISTD_H | |
30 | #include <unistd.h> | |
31 | #endif | |
32 | #include "epaths.h" /* For PATH_DATA. */ | |
701570d7 RS |
33 | |
34 | #define BUFSIZE 80 | |
bc851190 | 35 | #define SEP '\0' |
701570d7 RS |
36 | |
37 | #ifndef YOW_FILE | |
bc851190 | 38 | #define YOW_FILE "yow.lines" |
701570d7 | 39 | #endif |
bc851190 | 40 | |
35ebc5cf RS |
41 | #ifdef MSDOS |
42 | #define rootrelativepath(rel) \ | |
43 | ({\ | |
44 | static char res[BUFSIZE], *p;\ | |
45 | strcpy (res, argv[0]);\ | |
46 | p = res + strlen (res);\ | |
47 | while (p != res && *p != '/' && *p != '\\' && *p != ':') p--;\ | |
48 | strcpy (p + 1, "../");\ | |
49 | strcpy (p + 4, rel);\ | |
50 | &res;}) | |
51 | #endif | |
52 | ||
b3dcbddb DM |
53 | void yow(); |
54 | void setup_yow(); | |
55 | ||
340ff9de | 56 | int |
bc851190 RS |
57 | main (argc, argv) |
58 | int argc; | |
59 | char *argv[]; | |
60 | { | |
61 | FILE *fp; | |
62 | char file[BUFSIZ]; | |
bc851190 RS |
63 | |
64 | if (argc > 2 && !strcmp (argv[1], "-f")) | |
65 | strcpy (file, argv[2]); | |
66 | else | |
67 | #ifdef vms | |
4bcffd8e | 68 | sprintf (file, "%s%s", PATH_DATA, YOW_FILE); |
bc851190 | 69 | #else |
4bcffd8e | 70 | sprintf (file, "%s/%s", PATH_DATA, YOW_FILE); |
bc851190 RS |
71 | #endif |
72 | ||
73 | if ((fp = fopen(file, "r")) == NULL) { | |
b3dcbddb | 74 | fprintf(stderr, "yow: "); |
bc851190 | 75 | perror(file); |
65396510 | 76 | exit(EXIT_FAILURE); |
bc851190 RS |
77 | } |
78 | ||
79 | /* initialize random seed */ | |
5a13a7ec | 80 | srand((int) (getpid() + time((time_t *) 0))); |
bc851190 | 81 | |
701570d7 | 82 | setup_yow(fp); |
bc851190 RS |
83 | yow(fp); |
84 | fclose(fp); | |
65396510 | 85 | return EXIT_SUCCESS; |
bc851190 RS |
86 | } |
87 | ||
701570d7 RS |
88 | static long len = -1; |
89 | static long header_len; | |
90 | ||
91 | #define AVG_LEN 40 /* average length of a quotation */ | |
92 | ||
93 | /* Sets len and header_len */ | |
94 | void | |
95 | setup_yow(fp) | |
96 | FILE *fp; | |
97 | { | |
98 | int c; | |
99 | ||
100 | /* Get length of file */ | |
101 | /* Because the header (stuff before the first SEP) can be very long, | |
102 | * thus biasing our search in favor of the first quotation in the file, | |
103 | * we explicitly skip that. */ | |
104 | while ((c = getc(fp)) != SEP) { | |
105 | if (c == EOF) { | |
b3dcbddb | 106 | fprintf(stderr, "yow: file contains no separators\n"); |
701570d7 RS |
107 | exit(2); |
108 | } | |
109 | } | |
110 | header_len = ftell(fp); | |
111 | if (header_len > AVG_LEN) | |
112 | header_len -= AVG_LEN; /* allow the first quotation to appear */ | |
177c0ea7 | 113 | |
701570d7 | 114 | if (fseek(fp, 0L, 2) == -1) { |
b3dcbddb | 115 | perror("yow"); |
65396510 | 116 | exit(EXIT_FAILURE); |
701570d7 RS |
117 | } |
118 | len = ftell(fp) - header_len; | |
119 | } | |
120 | ||
121 | ||
122 | /* go to a random place in the file and print the quotation there */ | |
bc851190 RS |
123 | void |
124 | yow (fp) | |
125 | FILE *fp; | |
126 | { | |
bc851190 RS |
127 | long offset; |
128 | int c, i = 0; | |
701570d7 RS |
129 | char *buf; |
130 | unsigned int bufsize; | |
bc851190 | 131 | |
701570d7 | 132 | offset = rand() % len + header_len; |
bc851190 | 133 | if (fseek(fp, offset, 0) == -1) { |
b3dcbddb | 134 | perror("yow"); |
65396510 | 135 | exit(EXIT_FAILURE); |
bc851190 RS |
136 | } |
137 | ||
138 | /* Read until SEP, read next line, print it. | |
eb8c3be9 | 139 | (Note that we will never print anything before the first separator.) |
bc851190 RS |
140 | If we hit EOF looking for the first SEP, just recurse. */ |
141 | while ((c = getc(fp)) != SEP) | |
142 | if (c == EOF) { | |
143 | yow(fp); | |
144 | return; | |
145 | } | |
146 | ||
147 | /* Skip leading whitespace, then read in a quotation. | |
148 | If we hit EOF before we find a non-whitespace char, recurse. */ | |
149 | while (isspace(c = getc(fp))) | |
150 | ; | |
151 | if (c == EOF) { | |
152 | yow(fp); | |
153 | return; | |
154 | } | |
701570d7 RS |
155 | |
156 | bufsize = BUFSIZE; | |
9fc08e73 | 157 | buf = (char *) malloc(bufsize); |
701570d7 | 158 | if (buf == (char *)0) { |
b3dcbddb | 159 | fprintf(stderr, "yow: virtual memory exhausted\n"); |
701570d7 RS |
160 | exit (3); |
161 | } | |
162 | ||
bc851190 RS |
163 | buf[i++] = c; |
164 | while ((c = getc(fp)) != SEP && c != EOF) { | |
165 | buf[i++] = c; | |
177c0ea7 | 166 | |
701570d7 | 167 | if (i == bufsize-1) { |
bc851190 | 168 | /* Yow! Is this quotation too long yet? */ |
701570d7 | 169 | bufsize *= 2; |
9fc08e73 | 170 | buf = (char *) realloc(buf, bufsize); |
701570d7 | 171 | if (buf == (char *)0) { |
b3dcbddb | 172 | fprintf(stderr, "yow: virtual memory exhausted\n"); |
701570d7 RS |
173 | exit (3); |
174 | } | |
175 | } | |
bc851190 RS |
176 | } |
177 | buf[i++] = 0; | |
178 | printf("%s\n", buf); | |
179 | } | |
180 | ||
ab5796a9 MB |
181 | /* arch-tag: e40fc0df-bafb-4001-af24-5c883d1c685e |
182 | (do not change this comment) */ | |
65396510 TTN |
183 | |
184 | /* yow.c ends here */ |