2.9BSD - /usr/src/sys/autoconfig/args.c

   1: /*
   2:  * Generalized argument parser for use by people who are tired of writing
   3:  * and rewriting their own parsers.  This is general enough for my use
   4:  * but others might find the conventions it imposes to be too restrictive.
   5:  *
   6:  * Written 3-Dec-81 by Michael Toy
   7:  */
   8: 
   9: #include    <stdio.h>
  10: #include    "args.h"
  11: char    _bf[52];
  12: char    *_sf[52];
  13: char    **_argspace, **_ap;
  14: int nargs = 0;
  15: 
  16: parse_args(ac, av, bopts, fopts)
  17: int ac;
  18: char **av, *bopts, *fopts;
  19: {
  20:     int argc = ac, errcnt = 0;
  21:     char **argv = av, *pname, **ap, *cp;
  22: 
  23:     pname = argv[0];            /* Saved for error messages */
  24:     _ap = _argspace = ap = (char **) calloc(argc, sizeof (char *));
  25:     /*
  26: 	 * Loop once through the argument list.  Record boolean and string
  27: 	 * flags and count the number of arguments, saving each normal arg.
  28: 	 */
  29:     while (--argc) {
  30:     cp = *++argv;
  31:     /*
  32: 	 * A flag string begins with a - unless it is a -- which is
  33: 	 * a dash escape.
  34: 	 */
  35:     if (*cp == '-' && cp[1] != '-') {
  36:         /*
  37: 		 * Process each flag in the string.  Set boolean flags and
  38: 		 * save string flags
  39: 		 */
  40:         while(*++cp) {
  41:         if (index(bopts, *cp) != 0)
  42:             bools(*cp) = 1;         /* Set bool */
  43:         else if (index(fopts, *cp))
  44:             if (argc > 1) {
  45:             argc--;
  46:             strings(*cp) = newstr(*++argv); /* Save string */
  47:             } else {
  48:             fprintf(stderr,
  49:                 "%s: Argument for %c flag not specified\n",
  50:                 pname, *cp);
  51:             errcnt++;
  52:             }
  53:         else {
  54:             fprintf(stderr, "%s: No such flag as %c\n", pname, *cp);
  55:             errcnt++;
  56:         }
  57:         }
  58:     } else {
  59:         /*
  60: 		 * It is a regular argument, just save it
  61: 		 */
  62:         *ap++ = newstr(cp);
  63:         nargs++;
  64:     }
  65:     }
  66:     *ap++ = (char *) 0;
  67:     return errcnt;
  68: }
  69: 
  70: char *newstr(s)
  71: char *s;
  72: {
  73:     char *cp;
  74: 
  75:     cp = (char *) calloc(1, strlen(s)+1);
  76:     strcpy(cp, s);
  77:     return cp;
  78: }

Defined functions

Defined variables