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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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175
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12 #include <../src/config.h>
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0
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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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169
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47 int
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48 main (int argc, char *argv[])
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0
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49 {
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50 FILE *fp;
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51 char file[BUFSIZ];
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52
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53 if (argc > 2 && !strcmp (argv[1], "-f"))
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54 strcpy (file, argv[2]);
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55 else
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56 #ifdef PATH_DATA
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57 #ifdef vms
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58 sprintf (file, "%s%s", PATH_DATA, YOW_FILE);
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59 #else
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60 sprintf (file, "%s/%s", PATH_DATA, YOW_FILE);
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61 #endif
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62 #else /* !PATH_DATA */
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63 {
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64 fprintf (stderr,
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65 "%s: the location of the \"%s\" file was not supplied at compile-time.\n\
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66 You must supply it with the -f command-line option.\n",
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67 argv[0], YOW_FILE);
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68 exit (1);
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69 }
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70 #endif
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71
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72 if ((fp = fopen(file, "r")) == NULL) {
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73 perror(file);
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74 exit(1);
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75 }
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76
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77 /* initialize random seed */
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78 srand((int) (getpid() + time((time_t *) 0)));
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79
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80 setup_yow(fp);
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81 yow(fp);
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82 fclose(fp);
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169
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83 return 0;
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0
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84 }
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85
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86 static long len = -1;
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87 static long header_len;
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88
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89 #define AVG_LEN 40 /* average length of a quotation */
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90
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91 /* Sets len and header_len */
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92 void
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363
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93 setup_yow (FILE *fp)
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0
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94 {
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95 int c;
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96
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97 /* Get length of file */
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98 /* Because the header (stuff before the first SEP) can be very long,
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99 * thus biasing our search in favor of the first quotation in the file,
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100 * we explicitly skip that. */
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101 while ((c = getc(fp)) != SEP) {
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102 if (c == EOF) {
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103 fprintf(stderr, "File contains no separators.\n");
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104 exit(2);
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105 }
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106 }
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107 header_len = ftell(fp);
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108 if (header_len > AVG_LEN)
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109 header_len -= AVG_LEN; /* allow the first quotation to appear */
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110
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111 if (fseek(fp, 0L, 2) == -1) {
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112 perror("fseek 1");
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113 exit(1);
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114 }
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115 len = ftell(fp) - header_len;
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116 }
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117
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118
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119 /* go to a random place in the file and print the quotation there */
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120 void
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363
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121 yow (FILE *fp)
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0
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122 {
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123 long offset;
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124 int c, i = 0;
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125 char *buf;
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126 unsigned int bufsize;
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127
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128 offset = rand() % len + header_len;
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129 if (fseek(fp, offset, 0) == -1) {
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130 perror("fseek 2");
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131 exit(1);
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132 }
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133
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134 /* Read until SEP, read next line, print it.
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135 (Note that we will never print anything before the first separator.)
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136 If we hit EOF looking for the first SEP, just recurse. */
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137 while ((c = getc(fp)) != SEP)
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138 if (c == EOF) {
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139 yow(fp);
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140 return;
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141 }
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142
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143 /* Skip leading whitespace, then read in a quotation.
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144 If we hit EOF before we find a non-whitespace char, recurse. */
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145 while (isspace(c = getc(fp)))
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146 ;
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147 if (c == EOF) {
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148 yow(fp);
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149 return;
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150 }
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151
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152 bufsize = BUFSIZE;
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153 buf = (char *) malloc(bufsize);
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154 if (buf == (char *)0) {
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155 fprintf(stderr, "can't allocate any memory\n");
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156 exit (3);
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157 }
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158
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159 buf[i++] = c;
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160 while ((c = getc(fp)) != SEP && c != EOF) {
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161 buf[i++] = c;
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162
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163 if (i == bufsize-1) {
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164 /* Yow! Is this quotation too long yet? */
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165 bufsize *= 2;
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166 buf = (char *)realloc(buf, bufsize);
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167 if (buf == (char *)0) {
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168 fprintf(stderr, "can't allocate more memory\n");
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169 exit (3);
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170 }
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171 }
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172 }
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173 buf[i++] = 0;
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174 printf("%s\n", buf);
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175 }
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176
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