00001 /*
00002  * Copyright 1993, 1995 Christopher Seiwald.
00003  *
00004  * This file is part of Jam - see jam.c for Copyright information.
00005  */
00006 
00007 # include "jam.h"
00008 # include "option.h"
00009 
00010 /*
00011  * option.c - command line option processing
00012  *
00013  * {o >o
00014  *  <>) "Process command line options as defined in <option.h>.
00015  *                Return the number of argv[] elements used up by options,
00016  *                or -1 if an invalid option flag was given or an argument
00017  *                was supplied for an option that does not require one."
00018  */
00019 
00020 int
00021 getoptions(
00022     int argc,
00023     char **argv,
00024     char *opts,
00025     option *optv )
00026 {
00027     int i;
00028     int optc = N_OPTS;
00029 
00030     memset( (char *)optv, '\0', sizeof( *optv ) * N_OPTS );
00031 
00032     for( i = 0; i < argc; i++ )
00033     {
00034         char *arg;
00035 
00036         if( argv[i][0] != '-' || ( argv[i][1] != '-' && !isalpha( argv[i][1] ) ) )
00037             break;
00038 
00039         if( !optc-- )
00040         {
00041             printf( "too many options (%d max)\n", N_OPTS );
00042             return -1;
00043         }
00044 
00045         for( arg = &argv[i][1]; *arg; arg++ )
00046         {
00047             char *f;
00048 
00049             for( f = opts; *f; f++ )
00050                 if( *f == *arg )
00051                     break;
00052 
00053             if( !*f )
00054             {
00055                 printf( "Invalid option: -%c\n", *arg );
00056                 return -1;
00057             }
00058 
00059             optv->flag = *f;
00060 
00061             if( f[1] != ':' )
00062             {
00063                 optv++->val = "true";
00064             }
00065             else if( arg[1] )
00066             {
00067                 optv++->val = &arg[1];
00068                 break;
00069             }
00070             else if( ++i < argc )
00071             {
00072                 optv++->val = argv[i];
00073                 break;
00074             }
00075             else
00076             {
00077                 printf( "option: -%c needs argument\n", *f );
00078                 return -1;
00079             }
00080         }
00081     }
00082 
00083     return i;
00084 }
00085 
00086 /*
00087  * Name: getoptval() - find an option given its character
00088  */
00089 
00090 char *
00091 getoptval( 
00092         option *optv,
00093         char opt,
00094         int subopt )
00095 {
00096         int i;
00097 
00098         for( i = 0; i < N_OPTS; i++, optv++ )
00099             if( optv->flag == opt && !subopt-- )
00100                 return optv->val;
00101 
00102         return 0;
00103 }