diplodocus.org Git - nmh/blob - docs/historical/mh-6.8.5/miscellany/less-177/option.h

   1 #define END_OPTION_STRING       ('$')
   2
   3 /*
   4  * Types of options.
   5  */
   6 #define BOOL            01      /* Boolean option: 0 or 1 */
   7 #define TRIPLE          02      /* Triple-valued option: 0, 1 or 2 */
   8 #define NUMBER          04      /* Numeric option */
   9 #define STRING          010     /* String-valued option */
  10 #define NOVAR           020     /* No associated variable */
  11 #define REPAINT         040     /* Repaint screen after toggling option */
  12 #define NO_TOGGLE       0100    /* Option cannot be toggled with "-" cmd */
  13
  14 #define OTYPE           (BOOL|TRIPLE|NUMBER|STRING|NOVAR)
  15
  16 /*
  17  * Argument to a handling function tells what type of activity:
  18  */
  19 #define INIT    0       /* Initialization (from command line) */
  20 #define QUERY   1       /* Query (from _ or - command) */
  21 #define TOGGLE  2       /* Change value (from - command) */
  22
  23 /* Flag to toggle_option to specify how to "toggle" */
  24 #define OPT_NO_TOGGLE   0
  25 #define OPT_TOGGLE      1
  26 #define OPT_UNSET       2
  27 #define OPT_SET         3
  28
  29 struct option
  30 {
  31         char oletter;           /* The controlling letter (a-z) */
  32         char otype;             /* Type of the option */
  33         int odefault;           /* Default value */
  34         int *ovar;              /* Pointer to the associated variable */
  35         void (*ofunc)();        /* Pointer to special handling function */
  36         char *odesc[3];         /* Description of each value */
  37 };
  38