/* * Simplistic getopt() function for EFI * * This function provides the basic functionality of the POSIX getopt() function. * No long options are supported. * * This code is meant for EFI programs and therefore deals with Unicode characters. * * Copyright (C) 2000 Hewlett-Packard Co * Copyright (C) 2000 Stephane Eranian * * ELILO is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2, or (at your option) * any later version. * * ELILO is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with ELILO; see the file COPYING. If not, write to the Free * Software Foundation, 59 Temple Place - Suite 330, Boston, MA * 02111-1307, USA. */ #include #include #define DASH (CHAR16)'-' #define COLON (CHAR16)':' #define EOS (CHAR16)'\0' #define BADCH (INTN)'?' #define BADARG (INTN)':' extern CHAR16 * StrChr(IN const CHAR16 *s, INT16 c); CHAR16 *Optarg; INTN Optind = 1; INTN Optopt; /* * This simple version of getopt supports: * - option with no argument (no :) * - option with REQUIRED argument (single :) * it does not support: * - long options * - optional arguments to options * - optreset */ INTN Getopt(INTN argc, CHAR16 *const argv[], const CHAR16 *optstring) { static CHAR16 *cur_chr = NULL; CHAR16 *opt; if (Optind >= argc) { /* no option or end of argument list */ cur_chr = NULL; return -1; } if (cur_chr == NULL || *cur_chr == EOS) { cur_chr = argv[Optind]; if (*cur_chr++ != DASH) { /* missing DASH */ cur_chr = NULL; return -1; } if (*cur_chr == DASH) { cur_chr = NULL; Optind++; return -1; /* -- case, we're done */ } } Optopt = *cur_chr++; opt = StrChr(optstring, Optopt); if (!opt) { Print(L"%s: illegal option -- %c\n", argv[0], Optopt); if (*cur_chr == EOS) Optind++; return BADCH; } if (*(opt+1) != COLON) { Optarg = NULL; if (*cur_chr == EOS) Optind++; } else { if (*cur_chr) { Optarg = cur_chr; } else if ( ++Optind >= argc ) { Print(L"%s: option `%s' requires an argument\n", argv[0], argv[Optind-1]), cur_chr = NULL; return BADARG; } else { Optarg = argv[Optind]; } Optind++; } return Optopt; }