/* * Copyright 1993, 1995 Christopher Seiwald. * * This file is part of Jam - see jam.c for Copyright information. *//* * option.c - command line option processing * * {o >o *  \<>) "Process command line options as defined in <option.h>. *		  Return the number of argv[] elements used up by options, *		  or -1 if an invalid option flag was given or an argument *		  was supplied for an option that does not require one." * * 11/04/02 (seiwald) - const-ing for string literals */# include "jam.h"# include "option.h"intgetoptions(    int argc,    char **argv,    const char *opts,    option *optv ){    int i;    int optc = N_OPTS;    memset( (char *)optv, '\0', sizeof( *optv ) * N_OPTS );    for( i = 0; i < argc; i++ )    {	char *arg;	if( argv[i][0] != '-' || !isalpha( argv[i][1] ) )	    break;	if( !optc-- )	{	    printf( "too many options (%d max)\n", N_OPTS );	    return -1;	}	for( arg = &argv[i][1]; *arg; arg++ )	{	    const char *f;	    for( f = opts; *f; f++ )		if( *f == *arg )		    break;	    if( !*f )	    {		printf( "Invalid option: -%c\n", *arg );		return -1;	    }	    optv->flag = *f;	    if( f[1] != ':' )	    {		optv++->val = "true";	    }	    else if( arg[1] )	    {		optv++->val = &arg[1];		break;	    }	    else if( ++i < argc )	    {		optv++->val = argv[i];		break;	    }	    else	    {		printf( "option: -%c needs argument\n", *f );		return -1;	    }	}    }    return i;}/* * Name: getoptval() - find an option given its character */const char *getoptval( 	option *optv,	char opt,	int subopt ){	int i;	for( i = 0; i < N_OPTS; i++, optv++ )	    if( optv->flag == opt && !subopt-- )		return optv->val;	return 0;}