Commit | Line | Data |
---|---|---|
701570d7 RS |
1 | /* |
2 | * yow.c | |
bc851190 RS |
3 | * |
4 | * Print a quotation from Zippy the Pinhead. | |
5 | * Qux <Kaufman-David@Yale> March 6, 1986 | |
6 | * | |
701570d7 | 7 | * With dynamic memory allocation. |
bc851190 RS |
8 | */ |
9 | ||
701570d7 RS |
10 | #include <stdio.h> |
11 | #include <ctype.h> | |
21af68b6 | 12 | #include <../src/paths.h> /* For PATH_DATA. */ |
701570d7 RS |
13 | |
14 | #define BUFSIZE 80 | |
bc851190 | 15 | #define SEP '\0' |
701570d7 RS |
16 | |
17 | #ifndef YOW_FILE | |
bc851190 | 18 | #define YOW_FILE "yow.lines" |
701570d7 | 19 | #endif |
bc851190 | 20 | |
35ebc5cf RS |
21 | #ifdef MSDOS |
22 | #define rootrelativepath(rel) \ | |
23 | ({\ | |
24 | static char res[BUFSIZE], *p;\ | |
25 | strcpy (res, argv[0]);\ | |
26 | p = res + strlen (res);\ | |
27 | while (p != res && *p != '/' && *p != '\\' && *p != ':') p--;\ | |
28 | strcpy (p + 1, "../");\ | |
29 | strcpy (p + 4, rel);\ | |
30 | &res;}) | |
31 | #endif | |
32 | ||
340ff9de | 33 | int |
bc851190 RS |
34 | main (argc, argv) |
35 | int argc; | |
36 | char *argv[]; | |
37 | { | |
38 | FILE *fp; | |
39 | char file[BUFSIZ]; | |
701570d7 | 40 | void yow(), setup_yow(); |
bc851190 RS |
41 | |
42 | if (argc > 2 && !strcmp (argv[1], "-f")) | |
43 | strcpy (file, argv[2]); | |
44 | else | |
45 | #ifdef vms | |
4bcffd8e | 46 | sprintf (file, "%s%s", PATH_DATA, YOW_FILE); |
bc851190 | 47 | #else |
4bcffd8e | 48 | sprintf (file, "%s/%s", PATH_DATA, YOW_FILE); |
bc851190 RS |
49 | #endif |
50 | ||
51 | if ((fp = fopen(file, "r")) == NULL) { | |
52 | perror(file); | |
53 | exit(1); | |
54 | } | |
55 | ||
56 | /* initialize random seed */ | |
57 | srand((int) (getpid() + time((long *) 0))); | |
58 | ||
701570d7 | 59 | setup_yow(fp); |
bc851190 RS |
60 | yow(fp); |
61 | fclose(fp); | |
340ff9de | 62 | return 0; |
bc851190 RS |
63 | } |
64 | ||
701570d7 RS |
65 | static long len = -1; |
66 | static long header_len; | |
67 | ||
68 | #define AVG_LEN 40 /* average length of a quotation */ | |
69 | ||
70 | /* Sets len and header_len */ | |
71 | void | |
72 | setup_yow(fp) | |
73 | FILE *fp; | |
74 | { | |
75 | int c; | |
76 | ||
77 | /* Get length of file */ | |
78 | /* Because the header (stuff before the first SEP) can be very long, | |
79 | * thus biasing our search in favor of the first quotation in the file, | |
80 | * we explicitly skip that. */ | |
81 | while ((c = getc(fp)) != SEP) { | |
82 | if (c == EOF) { | |
83 | fprintf(stderr, "File contains no separators.\n"); | |
84 | exit(2); | |
85 | } | |
86 | } | |
87 | header_len = ftell(fp); | |
88 | if (header_len > AVG_LEN) | |
89 | header_len -= AVG_LEN; /* allow the first quotation to appear */ | |
90 | ||
91 | if (fseek(fp, 0L, 2) == -1) { | |
92 | perror("fseek 1"); | |
93 | exit(1); | |
94 | } | |
95 | len = ftell(fp) - header_len; | |
96 | } | |
97 | ||
98 | ||
99 | /* go to a random place in the file and print the quotation there */ | |
bc851190 RS |
100 | void |
101 | yow (fp) | |
102 | FILE *fp; | |
103 | { | |
bc851190 RS |
104 | long offset; |
105 | int c, i = 0; | |
701570d7 RS |
106 | char *buf; |
107 | unsigned int bufsize; | |
108 | char *malloc(), *realloc(); | |
bc851190 | 109 | |
701570d7 | 110 | offset = rand() % len + header_len; |
bc851190 RS |
111 | if (fseek(fp, offset, 0) == -1) { |
112 | perror("fseek 2"); | |
113 | exit(1); | |
114 | } | |
115 | ||
116 | /* Read until SEP, read next line, print it. | |
eb8c3be9 | 117 | (Note that we will never print anything before the first separator.) |
bc851190 RS |
118 | If we hit EOF looking for the first SEP, just recurse. */ |
119 | while ((c = getc(fp)) != SEP) | |
120 | if (c == EOF) { | |
121 | yow(fp); | |
122 | return; | |
123 | } | |
124 | ||
125 | /* Skip leading whitespace, then read in a quotation. | |
126 | If we hit EOF before we find a non-whitespace char, recurse. */ | |
127 | while (isspace(c = getc(fp))) | |
128 | ; | |
129 | if (c == EOF) { | |
130 | yow(fp); | |
131 | return; | |
132 | } | |
701570d7 RS |
133 | |
134 | bufsize = BUFSIZE; | |
135 | buf = malloc(bufsize); | |
136 | if (buf == (char *)0) { | |
137 | fprintf(stderr, "can't allocate any memory\n"); | |
138 | exit (3); | |
139 | } | |
140 | ||
bc851190 RS |
141 | buf[i++] = c; |
142 | while ((c = getc(fp)) != SEP && c != EOF) { | |
143 | buf[i++] = c; | |
701570d7 RS |
144 | |
145 | if (i == bufsize-1) { | |
bc851190 | 146 | /* Yow! Is this quotation too long yet? */ |
701570d7 RS |
147 | bufsize *= 2; |
148 | buf = realloc(buf, bufsize); | |
149 | if (buf == (char *)0) { | |
150 | fprintf(stderr, "can't allocate more memory\n"); | |
151 | exit (3); | |
152 | } | |
153 | } | |
bc851190 RS |
154 | } |
155 | buf[i++] = 0; | |
156 | printf("%s\n", buf); | |
157 | } | |
158 |