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fortune.c

fortune.c 2.9 KB
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  1. /* =============================================================================
    2. 

  2.  * PROGRAM:  ularn
    3. 

  3.  * FILENAME: fortune.c
    4. 

  4.  *
    5. 

  5.  * DESCRIPTION:
    6. 

  6.  * This module contains functions for displaying fortunes inside fortune
    7. 

  7.  * cookies.
    8. 

  8.  *
    9. 

  9.  * =============================================================================
    10. 

  10.  * EXPORTED VARIABLES
    11. 

  11.  *
    12. 

  12.  * None
    13. 

  13.  *
    14. 

  14.  * =============================================================================
    15. 

  15.  * EXPORTED FUNCTIONS
    16. 

  16.  *
    17. 

  17.  * fortune       - Returns a random fortune string.
    18. 

  18.  * free_fortunes - Frees the fortunes data.
    19. 

  19.  *
    20. 

  20.  * =============================================================================
    21. 

  21.  */
    22. 

  22. 

  23. #include <stdio.h>
    24. 

  24. 

  25. #include "fortune.h"
    26. 

  26. #include "header.h"
    27. 

  27. 

  28. /* =============================================================================
    29. 

  29.  * Local variables
    30. 

  30.  */
    31. 

  31. 

  32. #define MAX_FORTUNE_LEN 80
    33. 

  33. 

  34. /*
    35. 

  35.  * Data structure for a linked list of fortune strings read from the
    36. 

  36.  * fortune file
    37. 

  37.  */
    38. 

  38. struct FortuneType {
    39. 

  39.   char Line[MAX_FORTUNE_LEN];
    40. 

  40.   struct FortuneType *Next;
    41. 

  41. };
    42. 

  42. 

  43. static struct FortuneType *fortunes = NULL;
    44. 

  44. static int fortune_read = 0; /* true if we have loaded the fortune info */
    45. 

  45. static int nlines = 0;       /* # lines in fortune database */
    46. 

  46. 

  47. /* =============================================================================
    48. 

  48.  * Exported functions
    49. 

  49.  */
    50. 

  50. 

  51. /* =============================================================================
    52. 

  52.  * FUNCTION: fortune
    53. 

  53.  */
    54. 

  54. 

  55. char *fortune(char *file) {
    56. 

  56.   FILE *fp;
    57. 

  57.   char *Line;
    58. 

  58.   char Buffer[80];
    59. 

  59.   struct FortuneType *NewFortune;
    60. 

  60.   int Len;
    61. 

  61.   int Pos;
    62. 

  62. 

  63.   if (fortune_read == 0) {
    64. 

  64.     /* open the file */
    65. 

  65.     fp = fopen(file, "r");
    66. 

  66.     if (fp == NULL)
    67. 

  67.       /* can't find file */
    68. 

  68.       return 0;
    69. 

  69. 

  70.     /* Read the fortune lines from the file */
    71. 

  71.     while (!feof(fp)) {
    72. 

  72.       Line = fgets(Buffer, MAX_FORTUNE_LEN, fp);
    73. 

  73.       if (Line != NULL) {
    74. 

  74.         /* trim white space and CR/LF fromt he end of the line */
    75. 

  75.         Len = strlen(Buffer);
    76. 

  76.         Len--;
    77. 

  77.         while ((Len > 0) && isspace((int)Buffer[Len])) {
    78. 

  78.           Buffer[Len] = 0;
    79. 

  79.           Len--;
    80. 

  80.         }
    81. 

  81. 

  82.         /* Allocate a new fortune */
    83. 

  83.         NewFortune = (struct FortuneType *)malloc(sizeof(struct FortuneType));
    84. 

  84. 

  85.         if (NewFortune == NULL)
    86. 

  86.           return NULL;
    87. 

  87. 

  88.         strcpy(NewFortune->Line, Buffer);
    89. 

  89.         NewFortune->Next = fortunes;
    90. 

  90.         fortunes = NewFortune;
    91. 

  91.         nlines++;
    92. 

  92.       }
    93. 

  93.     }
    94. 

  94. 

  95.     fortune_read = 1;
    96. 

  96. 

  97.     fclose(fp);
    98. 

  98.   }
    99. 

  99. 

  100.   if (fortune_read) {
    101. 

  101.     if (nlines > 0) {
    102. 

  102.       Pos = rund(nlines);
    103. 

  103.       NewFortune = fortunes;
    104. 

  104. 

  105.       while (Pos > 0) {
    106. 

  106.         NewFortune = NewFortune->Next;
    107. 

  107.         Pos--;
    108. 

  108.       }
    109. 

  109. 

  110.       return NewFortune->Line;
    111. 

  111.     } else
    112. 

  112.       return NULL;
    113. 

  113.   } else
    114. 

  114.     return NULL;
    115. 

  115. }
    116. 

  116. 

  117. /* =============================================================================
    118. 

  118.  * FUNCTION: free_fortunes
    119. 

  119.  */
    120. 

  120. void free_fortunes(void) {
    121. 

  121.   struct FortuneType *Fortune;
    122. 

  122. 

  123.   while (fortunes != NULL) {
    124. 

  124.     Fortune = fortunes->Next;
    125. 

  125.     free(fortunes);
    126. 

  126.     fortunes = Fortune;
    127. 

  127.   }
    128. 

  128. }
    129. 

  129.