/* getopts.c */
/* $Header: H:/ADS/SRC/MSG/RCS/GETOPTS.C 1.3 1995/05/01 14:30:33 Reini Exp $ */

/*********************************************************************/
/*                                                                   */
/*  This Program Written by Paul Edwards.                            */
/*                                                                   */
/*********************************************************************/
/*********************************************************************/
/*                                                                   */
/*  getopts - scan the command line for switches.                    */
/*                                                                   */
/*  This program takes the following parameters:                     */
/*                                                                   */
/*  1) argc (which was given to main)                                */
/*  2) argv (which was given to main)                                */
/*  3) Array of options                                              */
/*                                                                   */
/*  Returns the number of the argument that is next to be processed  */
/*  that wasn't recognised as an option.                             */
/*  Example of use:                                                  */
/*                                                                   */
/*  #include <getopts.h>                                             */
/*  int baud = 2400;                                                 */
/*  char fon[13] = "telix.fon";                                      */
/*  opt_t opttable[] =                                               */
/*  {                                                                */
/*    { "b", OPTINT, &baud },                                        */
/*    { "f", OPTSTR, fon },                                          */
/*    { NULL, 0, NULL }                                              */
/*  }                                                                */
/*  optup = getopts(argc,argv,opttable);                             */
/*                                                                   */
/*  The OPTINT means that an integer is being supplied.  OPTSTR      */
/*  means a string (with no check for overflow).  Also there is      */
/*  OPTBOOL which means it is a switch that is being passed, and an  */
/*  OPTLONG to specify a long.                                       */
/*                                                                   */
/*  This program was inspired by a description of a getargs function */
/*  written by Dr Dobbs Small-C Handbook.  Naturally I didn't get    */
/*  to see the code, otherwise I wouldn't be writing this!           */
/*                                                                   */
/*  This program is dedicated to the public domain.  It would be     */
/*  nice but not necessary if you gave me credit for it.  I would    */
/*  like to thank the members of the International C Conference      */
/*  (in Fidonet) for the help they gave me in writing this.          */
/*                                                                   */
/*  Written 16-Feb-1990.                                             */
/*                                                                   */
/*  Additions by Reini Urban, Graz April 1995:                       */
/*    stringoptions (OPTSTR) as /sstring or as /s string             */
/*      after a string must be whitespace! no "/sstring/a" allowed   */
/*      problems with "/a/b/c"                                       */
/*      a '-' after a bool switch means 0 not next switch            */
/*      valid args: "/a-/b+/sstring /w test"                         */
/*      returns: 3 for "test"                                        */
/*    accepts a '=' after the switch                                 */
/*      eg: /l=string                                                */
/*    new type OPTOPT for options with one or more suboptions        */
/*      eg: for optimization /o with suboptions ailmn...             */
/*      returns the suboptions as string                             */
/*                                                                   */
/*  No warranties!                                                   */
/*
      $Log: GETOPTS.C $
      Revision 1.3  1995/05/01 14:30:33  Reini
      new type OPTSUBOPT added,
      delim '=' between opt and value added, eg: /s=string
*/
/*********************************************************************/

#include "getopts.h"
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <stdio.h>

getopts(int argc, char **argv, opt_t opttable[])
{
    int i,j,l,bool;
    char *arg;
    char header[] = "$Id: GETOPTS.C 1.3 1995/05/01 14:30:33 Reini Exp $";
    char credits[] = "written by Paul Edwards, improved by Reini Urban";

    argv++;
    argc--;
    for (i=1;i<=argc;i++)
    {
	arg = *argv;
	if ((*arg != '-') && (*arg != '/')) return (i);
	arg++;
	while ( *arg )
	{
	    for (j=0;opttable[j].sw != NULL;j++)
	    {
	      //options are case sensitive!!
	      l = strlen(opttable[j].sw);
	      if (strncmp(arg,opttable[j].sw, l) == 0)
	      {
	        switch ((int)opttable[j].opttyp)
	        {
              	    case OPTINT :
	               	*((int *)opttable[j].var) = (int)strtol(arg+l,NULL,10);
	               	if (errno == ERANGE)
	               		return (i);
	                break;
	            case OPTSUBOPT :
	            	//option with more than 1 char as suboptions:
	            	// /oail or /op
	            	strcpy((char *)opttable[j].var, arg+l);
	            	arg += strlen(arg)-1;
	            	break;
	            case OPTSTR :
	            	if ( (strlen(arg) == l) &&
			     ( **(argv+1) != '-') &&
			     ( **(argv+1) != '/') )
			{	//copy the next arg: /s string
			    argv++; i++;
			    strcpy((char *)opttable[j].var,*argv);
			}
			else
			//copy the rest: /sstring
			{	
			    if ( *(arg+l)=='=' )
			    	strcpy((char *)opttable[j].var, arg+l+1);
			    else
			    	strcpy((char *)opttable[j].var, arg+l);
			}
			arg += strlen(arg)-1;
			break;
		    case OPTBOOL :
			//check a + or - after the sw: "/a-/b+"
			if ( *(arg+l)=='-' )
			{
			    arg++; //advance argv after -
			    bool = 0;
			}
			else
			    if ( *(arg+l)=='+' )
		  	    {
				arg++; //advance argv after -
				bool = 1;
			    }
			    else
				bool = 1;
	               	*((int *)opttable[j].var) = bool;
	               	break;
	            case OPTLONG :
	                *((long *)opttable[j].var) = strtol(arg+l,NULL,10);
	                if (errno == ERANGE)
	                    return (i);
	                break;
	        }
	    	arg += l-1; //next arg within the same arg, "/a/b" or "/ab"
	      	break;      //break the for
	      }
	    }
	    arg++;	//try the next char
	    if ((*arg == '-') || (*arg == '/')) arg++;
        }
        argv++;  //try the next arg, eg: "/a /b"
    }
    return (i);
}