2.9BSD - /usr/src/ucb/vsh/strings.h

   1: /*  Ascii control table.  There are 129 entries.  To find the class
   2:     of a character, mask out the parity bit (if raw I/O is being
   3:     used) and use it as an index the the ascii array.  With "cooked"
   4:     I/O, EOF is -1.  EOF with "parity" masked out is 7f, which is also
   5:     coded as an eof.  With "raw" I/O, EOT acts as an eof. */
   6: 
   7: /*	Each entry in the table has the following bits:
   8: 	1	End of line
   9: 	2	End of file
  10: 	4	Alpha
  11: 	8	Upper case
  12: 	16	Number
  13: 	32	Special character
  14: 	64	White space
  15: */
  16: /*	Codes for loading table	*/
  17: 
  18: #define UD  0   /* Undefined--assorted control characters */
  19: #define EL  1   /* End of line */
  20: #define EF  3   /* End of File (and line) */
  21: #define LA  4   /* Lower case alpha */
  22: #define UA  12  /* Upper case alpha */
  23: #define NU  16  /* Numeric */
  24: #define SC  32  /* Special character */
  25: #define WS  64  /* White space */
  26: 
  27: 
  28: /* Ascii acts like an array indexed from -1 to 128 */
  29: 
  30: extern char charclass [];
  31: #define ascii   (charclass + 1)
  32: 
  33: /* Usefull macro functions */
  34: 
  35: #define WHITESPACE(arg) (ascii [arg] == WS)
  36: #define NUMERIC(arg)    (ascii [arg] == NU)
  37: #define ENDLINE(arg)    (ascii [arg] & EL)
  38: 
  39: #define TONUM(arg)  (arg - '0')
  40: 
  41: /* This reads a line from stdin and returns the first word */
  42: #define getword(arg)    xgetword (arg, sizeof arg)
  43: 
  44: /* Read a line from stdin */
  45: #define getline(arg)    xgetline (stdin, arg, sizeof arg)
  46: 
  47: /* Read a line from any stream */
  48: #define fgetline(arg1,arg2) xgetline (arg1, arg2, sizeof arg2)

Defined macros

Usage of this include