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428
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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 #define DONT_ENCAPSULATE
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438
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13 #include <config.h>
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428
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14
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15 #include <stdio.h>
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16 #include <ctype.h>
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17 #include <../src/paths.h> /* For PATH_DATA. */
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18
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19 #if __STDC__ || defined(STDC_HEADERS)
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20 #include <stdlib.h>
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21 #include <unistd.h>
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22 #include <string.h>
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23 #include <time.h> /* for time() */
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24 #endif
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25
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26 #define BUFSIZE 80
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27 #define SEP '\0'
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28
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29 #ifndef YOW_FILE
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30 #define YOW_FILE "yow.lines"
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31 #endif
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32
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33 void yow (FILE *fp);
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34 void setup_yow (FILE *fp);
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35
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36 #ifdef MSDOS
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37 #define rootrelativepath(rel) \
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38 ({\
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39 static char res[BUFSIZE], *p;\
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40 strcpy (res, argv[0]);\
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41 p = res + strlen (res);\
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42 while (p != res && *p != '/' && *p != '\\' && *p != ':') p--;\
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43 strcpy (p + 1, "../");\
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44 strcpy (p + 4, rel);\
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45 &res;})
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46 #endif
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47
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48 int
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49 main (int argc, char *argv[])
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50 {
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51 FILE *fp;
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52 char file[BUFSIZ];
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53
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54 if (argc > 2 && !strcmp (argv[1], "-f"))
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55 strcpy (file, argv[2]);
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56 else
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57 #ifdef PATH_DATA
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58 #ifdef vms
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59 sprintf (file, "%s%s", PATH_DATA, YOW_FILE);
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60 #else
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61 sprintf (file, "%s/%s", PATH_DATA, YOW_FILE);
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62 #endif
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63 #else /* !PATH_DATA */
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64 {
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65 fprintf (stderr,
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66 "%s: the location of the \"%s\" file was not supplied at compile-time.\n\
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67 You must supply it with the -f command-line option.\n",
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68 argv[0], YOW_FILE);
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69 exit (1);
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70 }
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71 #endif
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72
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73 if ((fp = fopen(file, "r")) == NULL) {
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74 perror(file);
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75 exit(1);
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76 }
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77
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78 /* initialize random seed */
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79 srand((int) (getpid() + time((time_t *) 0)));
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80
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81 setup_yow(fp);
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82 yow(fp);
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83 fclose(fp);
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84 return 0;
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85 }
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86
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87 static long len = -1;
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88 static long header_len;
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89
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90 #define AVG_LEN 40 /* average length of a quotation */
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91
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92 /* Sets len and header_len */
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93 void
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440
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94 setup_yow (FILE *fp)
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428
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95 {
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96 int c;
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97
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98 /* Get length of file */
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99 /* Because the header (stuff before the first SEP) can be very long,
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100 * thus biasing our search in favor of the first quotation in the file,
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101 * we explicitly skip that. */
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102 while ((c = getc(fp)) != SEP) {
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103 if (c == EOF) {
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104 fprintf(stderr, "File contains no separators.\n");
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105 exit(2);
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106 }
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107 }
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108 header_len = ftell(fp);
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109 if (header_len > AVG_LEN)
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110 header_len -= AVG_LEN; /* allow the first quotation to appear */
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111
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112 if (fseek(fp, 0L, 2) == -1) {
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113 perror("fseek 1");
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114 exit(1);
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115 }
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116 len = ftell(fp) - header_len;
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117 }
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118
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119
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120 /* go to a random place in the file and print the quotation there */
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121 void
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440
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122 yow (FILE *fp)
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428
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123 {
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124 long offset;
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125 int c, i = 0;
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126 char *buf;
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127 unsigned int bufsize;
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128
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129 offset = rand() % len + header_len;
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130 if (fseek(fp, offset, 0) == -1) {
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131 perror("fseek 2");
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132 exit(1);
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133 }
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134
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135 /* Read until SEP, read next line, print it.
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136 (Note that we will never print anything before the first separator.)
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137 If we hit EOF looking for the first SEP, just recurse. */
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138 while ((c = getc(fp)) != SEP)
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139 if (c == EOF) {
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140 yow(fp);
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141 return;
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142 }
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143
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144 /* Skip leading whitespace, then read in a quotation.
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145 If we hit EOF before we find a non-whitespace char, recurse. */
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146 while (isspace(c = getc(fp)))
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147 ;
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148 if (c == EOF) {
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149 yow(fp);
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150 return;
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151 }
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152
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153 bufsize = BUFSIZE;
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154 buf = (char *) malloc(bufsize);
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155 if (buf == (char *)0) {
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156 fprintf(stderr, "can't allocate any memory\n");
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157 exit (3);
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158 }
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159
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160 buf[i++] = c;
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161 while ((c = getc(fp)) != SEP && c != EOF) {
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162 buf[i++] = c;
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163
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164 if (i == bufsize-1) {
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165 /* Yow! Is this quotation too long yet? */
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166 bufsize *= 2;
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167 buf = (char *)realloc(buf, bufsize);
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168 if (buf == (char *)0) {
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169 fprintf(stderr, "can't allocate more memory\n");
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170 exit (3);
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171 }
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172 }
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173 }
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174 buf[i++] = 0;
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175 printf("%s\n", buf);
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176 }
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177
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