98 lines
2.5 KiB
C
98 lines
2.5 KiB
C
/*
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* Simplistic getopt() function for EFI
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*
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* This function provides the basic functionality of the POSIX getopt() function.
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* No long options are supported.
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*
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* This code is meant for EFI programs and therefore deals with Unicode characters.
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*
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* Copyright (C) 2000 Hewlett-Packard Co
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* Copyright (C) 2000 Stephane Eranian <eranian@hpl.hp.com>
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*
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* ELILO is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* ELILO is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with ELILO; see the file COPYING. If not, write to the Free
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* Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*/
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#include <efi.h>
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#include <efilib.h>
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#define DASH (CHAR16)'-'
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#define COLON (CHAR16)':'
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#define EOS (CHAR16)'\0'
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#define BADCH (INTN)'?'
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#define BADARG (INTN)':'
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extern CHAR16 * StrChr(IN const CHAR16 *s, CHAR16 c);
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CHAR16 *Optarg;
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INTN Optind = 1;
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INTN Optopt;
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/*
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* This simple version of getopt supports:
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* - option with no argument (no :)
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* - option with REQUIRED argument (single :)
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* it does not support:
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* - long options
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* - optional arguments to options
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* - optreset
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*/
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INTN
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Getopt(INTN argc, CHAR16 *const argv[], const CHAR16 *optstring)
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{
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static CHAR16 *cur_chr = NULL;
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CHAR16 *opt;
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if (Optind >= argc) { /* no option or end of argument list */
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cur_chr = NULL;
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return -1;
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}
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if (cur_chr == NULL || *cur_chr == EOS) {
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cur_chr = argv[Optind];
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if (*cur_chr++ != DASH) { /* missing DASH */
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cur_chr = NULL;
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return -1;
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}
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if (*cur_chr == DASH) {
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cur_chr = NULL;
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Optind++;
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return -1; /* -- case, we're done */
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}
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}
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Optopt = *cur_chr++;
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opt = StrChr(optstring, Optopt);
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if (!opt) {
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Print(L"%s: illegal option -- %c\n", argv[0], Optopt);
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if (*cur_chr == EOS) Optind++;
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return BADCH;
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}
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if (*(opt+1) != COLON) {
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Optarg = NULL;
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if (*cur_chr == EOS) Optind++;
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} else {
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if (*cur_chr) {
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Optarg = cur_chr;
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} else if ( ++Optind >= argc ) {
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Print(L"%s: option `%s' requires an argument\n", argv[0], argv[Optind-1]),
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cur_chr = NULL;
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return BADARG;
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} else {
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Optarg = argv[Optind];
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}
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Optind++;
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}
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return Optopt;
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}
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