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1 /*
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2 * yow.c
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3 *
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4 * Print a quotation from Zippy the Pinhead.
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5 * Qux <Kaufman-David@Yale> March 6, 1986
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6 *
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7 * With dynamic memory allocation.
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8 */
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9
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10 /* Synched up with: FSF 19.28. */
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11
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12 #include <config.h>
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13
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14 #include <stdio.h>
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15 #include <ctype.h>
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16 #include <../src/paths.h> /* For PATH_DATA. */
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17
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18 #if __STDC__ || defined(STDC_HEADERS)
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19 #include <stdlib.h>
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20 #include <unistd.h>
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21 #include <string.h>
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22 #include <time.h> /* for time() */
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23 #endif
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24
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25 #define BUFSIZE 80
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26 #define SEP '\0'
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27
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28 #ifndef YOW_FILE
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29 #define YOW_FILE "yow.lines"
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30 #endif
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31
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32 void yow (FILE *fp);
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33 void setup_yow (FILE *fp);
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34
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35 #ifdef MSDOS
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36 #define rootrelativepath(rel) \
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37 ({\
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38 static char res[BUFSIZE], *p;\
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39 strcpy (res, argv[0]);\
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40 p = res + strlen (res);\
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41 while (p != res && *p != '/' && *p != '\\' && *p != ':') p--;\
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42 strcpy (p + 1, "../");\
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43 strcpy (p + 4, rel);\
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44 &res;})
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45 #endif
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46
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47 void
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48 main (argc, argv)
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49 int argc;
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50 char *argv[];
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51 {
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52 FILE *fp;
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53 char file[BUFSIZ];
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54
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55 if (argc > 2 && !strcmp (argv[1], "-f"))
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56 strcpy (file, argv[2]);
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57 else
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58 #ifdef PATH_DATA
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59 #ifdef vms
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60 sprintf (file, "%s%s", PATH_DATA, YOW_FILE);
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61 #else
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62 sprintf (file, "%s/%s", PATH_DATA, YOW_FILE);
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63 #endif
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64 #else /* !PATH_DATA */
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65 {
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66 fprintf (stderr,
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67 "%s: the location of the \"%s\" file was not supplied at compile-time.\n\
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68 You must supply it with the -f command-line option.\n",
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69 argv[0], YOW_FILE);
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70 exit (1);
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71 }
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72 #endif
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73
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74 if ((fp = fopen(file, "r")) == NULL) {
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75 perror(file);
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76 exit(1);
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77 }
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78
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79 /* initialize random seed */
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80 srand((int) (getpid() + time((time_t *) 0)));
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81
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82 setup_yow(fp);
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83 yow(fp);
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84 fclose(fp);
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85 exit(0);
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86 }
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87
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88 static long len = -1;
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89 static long header_len;
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90
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91 #define AVG_LEN 40 /* average length of a quotation */
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92
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93 /* Sets len and header_len */
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94 void
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95 setup_yow(fp)
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96 FILE *fp;
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97 {
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98 int c;
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99
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100 /* Get length of file */
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101 /* Because the header (stuff before the first SEP) can be very long,
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102 * thus biasing our search in favor of the first quotation in the file,
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103 * we explicitly skip that. */
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104 while ((c = getc(fp)) != SEP) {
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105 if (c == EOF) {
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106 fprintf(stderr, "File contains no separators.\n");
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107 exit(2);
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108 }
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109 }
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110 header_len = ftell(fp);
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111 if (header_len > AVG_LEN)
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112 header_len -= AVG_LEN; /* allow the first quotation to appear */
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113
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114 if (fseek(fp, 0L, 2) == -1) {
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115 perror("fseek 1");
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116 exit(1);
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117 }
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118 len = ftell(fp) - header_len;
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119 }
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120
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121
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122 /* go to a random place in the file and print the quotation there */
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123 void
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124 yow (fp)
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125 FILE *fp;
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126 {
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127 long offset;
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128 int c, i = 0;
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129 char *buf;
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130 unsigned int bufsize;
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131
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132 offset = rand() % len + header_len;
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133 if (fseek(fp, offset, 0) == -1) {
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134 perror("fseek 2");
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135 exit(1);
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136 }
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137
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138 /* Read until SEP, read next line, print it.
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139 (Note that we will never print anything before the first separator.)
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140 If we hit EOF looking for the first SEP, just recurse. */
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141 while ((c = getc(fp)) != SEP)
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142 if (c == EOF) {
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143 yow(fp);
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144 return;
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145 }
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146
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147 /* Skip leading whitespace, then read in a quotation.
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148 If we hit EOF before we find a non-whitespace char, recurse. */
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149 while (isspace(c = getc(fp)))
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150 ;
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151 if (c == EOF) {
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152 yow(fp);
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153 return;
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154 }
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155
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156 bufsize = BUFSIZE;
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157 buf = (char *) malloc(bufsize);
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158 if (buf == (char *)0) {
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159 fprintf(stderr, "can't allocate any memory\n");
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160 exit (3);
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161 }
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162
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163 buf[i++] = c;
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164 while ((c = getc(fp)) != SEP && c != EOF) {
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165 buf[i++] = c;
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166
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167 if (i == bufsize-1) {
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168 /* Yow! Is this quotation too long yet? */
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169 bufsize *= 2;
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170 buf = (char *)realloc(buf, bufsize);
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171 if (buf == (char *)0) {
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172 fprintf(stderr, "can't allocate more memory\n");
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173 exit (3);
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174 }
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175 }
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176 }
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177 buf[i++] = 0;
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178 printf("%s\n", buf);
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179 }
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180
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