1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 1992-1996,2003 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1988 AT&T */ 28 /* All Rights Reserved */ 29 30 31 /* 32 * This file contains getoptstr(), which is getopt() for strings of arguments 33 * (not arrays of strings). It is used by the bootloader ({*fs,inet}boot) and 34 * the kernel to process argument strings. 35 */ 36 37 38 #include "getoptstr.h" 39 #include <sys/null.h> 40 41 42 /* 43 * This routine needs to be supplied by whatever uses this file. 44 */ 45 char *strchr(const char *s, int c); 46 47 48 #define ISNTWORDCH(c) ((c) == '\0' || ISSPACE(c)) 49 50 51 /* 52 * Prepare a gos_params structure for use by getoptstr(). 53 */ 54 void 55 getoptstr_init(struct gos_params *params) 56 { 57 params->gos_pos = 1; 58 } 59 60 /* 61 * Modeled after lib/libc/port/gen/getopt.c. 62 * 63 * With params->gos_opts set to a string of options and params->gos_strp set to 64 * an argument string, getoptstr returns 65 * * the next option letter, where the options are given by the 66 * params->gos_opts string. If the option is followed by a ':' in gos_opts, 67 * then params->gos_optargp will point to the beginning of the argument in 68 * the string, and params->gos_optarglen will contain its length. 69 * * -1 if "--" or a non-option argument is encountered. In the former 70 * case, params->gos_strp is advanced to the next argument. 71 * * '?' if an illegal option is encountered or if an argument is not 72 * supplied for an option which requires one and ':' is not the first 73 * character of opts. In both cases, the option letter is available in 74 * params->gos_last_opt, and in the former case, params->gos_errp will 75 * point to the offending character. 76 * * ':' if an argument is not supplied for an option which requires one and 77 * ':' is the first character of params->gos_opts. 78 */ 79 int 80 getoptstr(struct gos_params *params) 81 { 82 char c; 83 char *cp; 84 85 /* 86 * const because we should update params. Just make sure you don't 87 * use this after you update params->gos_strp. 88 */ 89 const char * const strp = params->gos_strp; 90 91 92 if (params->gos_opts == NULL || strp == NULL) 93 return (-1); 94 95 if (params->gos_pos == 1) { 96 /* At beginning of new word. */ 97 98 if (strp[0] == '\0' || strp[0] != '-') 99 return (-1); 100 if (ISNTWORDCH(strp[1])) { 101 /* Lone dash. */ 102 return (-1); 103 } 104 105 /* Check for "--" */ 106 if (strp[1] == '-' && ISNTWORDCH(strp[2])) { 107 params->gos_strp = &strp[2]; 108 SKIP_SPC(params->gos_strp); 109 return (-1); 110 } 111 } 112 113 params->gos_last_opt = c = strp[params->gos_pos]; 114 if (c == ':' || (cp = strchr(params->gos_opts, c)) == NULL) { 115 /* Unrecognized option error. */ 116 params->gos_errp = &strp[params->gos_pos]; 117 ++params->gos_pos; 118 if (ISNTWORDCH(strp[params->gos_pos])) { 119 params->gos_strp = &strp[params->gos_pos]; 120 SKIP_SPC(params->gos_strp); 121 params->gos_pos = 1; 122 } 123 return ('?'); 124 } 125 126 if (cp[1] == ':') { 127 /* This option expects an argument. */ 128 129 params->gos_strp = &strp[params->gos_pos + 1]; 130 131 if (ISNTWORDCH(*params->gos_strp)) { 132 /* The argument is in the next word. */ 133 SKIP_SPC(params->gos_strp); 134 135 if (*params->gos_strp == '\0') { 136 /* Not. Missing argument. */ 137 params->gos_pos = 1; 138 params->gos_optargp = NULL; 139 return (params->gos_opts[0] == ':' ? ':' : '?'); 140 } 141 } 142 143 params->gos_optargp = params->gos_strp; 144 145 /* Advance to the next word. */ 146 SKIP_WORD(params->gos_strp); 147 params->gos_optarglen = params->gos_strp - params->gos_optargp; 148 SKIP_SPC(params->gos_strp); 149 150 params->gos_pos = 1; 151 } else { 152 ++params->gos_pos; 153 if (ISNTWORDCH(strp[params->gos_pos])) { 154 params->gos_strp = &strp[params->gos_pos]; 155 SKIP_SPC(params->gos_strp); 156 params->gos_pos = 1; 157 } 158 params->gos_optargp = NULL; 159 } 160 return (c); 161 } 162