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https://github.com/bulletphysics/bullet3
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106 lines
1.7 KiB
C
106 lines
1.7 KiB
C
/*
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* Copyright 1993, 1995 Christopher Seiwald.
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*
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* This file is part of Jam - see jam.c for Copyright information.
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*/
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/*
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* option.c - command line option processing
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*
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* {o >o
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* \<>) "Process command line options as defined in <option.h>.
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* Return the number of argv[] elements used up by options,
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* or -1 if an invalid option flag was given or an argument
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* was supplied for an option that does not require one."
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*
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* 11/04/02 (seiwald) - const-ing for string literals
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*/
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# include "jam.h"
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# include "option.h"
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int
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getoptions(
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int argc,
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char **argv,
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const char *opts,
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option *optv )
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{
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int i;
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int optc = N_OPTS;
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memset( (char *)optv, '\0', sizeof( *optv ) * N_OPTS );
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for( i = 0; i < argc; i++ )
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{
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char *arg;
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if( argv[i][0] != '-' || !isalpha( argv[i][1] ) )
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break;
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if( !optc-- )
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{
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printf( "too many options (%d max)\n", N_OPTS );
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return -1;
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}
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for( arg = &argv[i][1]; *arg; arg++ )
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{
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const char *f;
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for( f = opts; *f; f++ )
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if( *f == *arg )
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break;
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if( !*f )
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{
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printf( "Invalid option: -%c\n", *arg );
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return -1;
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}
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optv->flag = *f;
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if( f[1] != ':' )
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{
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optv++->val = "true";
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}
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else if( arg[1] )
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{
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optv++->val = &arg[1];
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break;
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}
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else if( ++i < argc )
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{
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optv++->val = argv[i];
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break;
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}
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else
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{
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printf( "option: -%c needs argument\n", *f );
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return -1;
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}
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}
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}
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return i;
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}
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/*
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* Name: getoptval() - find an option given its character
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*/
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const char *
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getoptval(
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option *optv,
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char opt,
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int subopt )
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{
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int i;
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for( i = 0; i < N_OPTS; i++, optv++ )
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if( optv->flag == opt && !subopt-- )
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return optv->val;
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return 0;
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}
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