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option.c

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/*
 * Copyright 1993, 1995 Christopher Seiwald.
 *
 * This file is part of Jam - see jam.c for Copyright information.
 */

# include "jam.h"
# include "option.h"

/*
 * 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."
 */

int
getoptions(
    int argc,
    char **argv,
    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] != '-' || ( argv[i][1] != '-' && !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++ )
        {
            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
 */

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;
}

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