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annotate packages/redboot/current/src/parse.c @ 136:a9ac27ec7abc ecos-sw-2000-11-17

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Merge from eCos master repository on 2000-11-17-18:24:25-GMT
author jlarmour
date Fri, 17 Nov 2000 23:16:43 +0000
parents eb9fd8c04db3
children 6b5f480c6929
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1 //==========================================================================
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2 //
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3 // parse.c
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4 //
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5 // RedBoot command line parsing routine
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6 //
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7 //==========================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //==========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): gthomas
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35 // Contributors: gthomas
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36 // Date: 2000-07-14
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37 // Purpose:
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38 // Description:
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39 //
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40 // This code is part of RedBoot (tm).
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41 //
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42 //####DESCRIPTIONEND####
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43 //
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44 //==========================================================================
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45
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46 #include <redboot.h>
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47 #include <cyg/hal/hal_arch.h>
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48 #include <cyg/hal/hal_intr.h>
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49 #include <cyg/hal/hal_cache.h>
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50 #include CYGHWR_MEMORY_LAYOUT_H
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51 #include <cyg/hal/hal_tables.h>
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52
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53 // Define table boundaries
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54 extern struct cmd __RedBoot_CMD_TAB__[], __RedBoot_CMD_TAB_END__;
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55
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56 //
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57 // Scan through an input line and break it into "arguments". These
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58 // are space delimited strings. Return a structure which points to
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59 // the strings, similar to a Unix program.
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60 // Note: original input is destroyed by replacing the delimiters with
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61 // null ('\0') characters for ease of use.
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62 //
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63 struct cmd *
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64 parse(char *line, int *argc, char **argv)
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65 {
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66 char *cp = line;
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67 int indx = 0;
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68
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69 while (*cp) {
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70 // Skip leading spaces
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71 while (*cp && *cp == ' ') cp++;
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72 if (!*cp) {
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73 break; // Line ended with a string of spaces
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74 }
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75 argv[indx++] = cp;
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76 while (*cp) {
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77 if (*cp == ' ') {
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78 *cp++ = '\0';
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79 break;
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80 } else if (*cp == '"') {
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81 // Swallow quote, scan till following one
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82 if (argv[indx-1] == cp) {
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83 argv[indx-1] = ++cp;
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84 }
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85 while (*cp && *cp != '"') cp++;
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86 if (!*cp) {
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87 printf("Unbalanced string!\n");
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88 } else {
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89 *cp++ = '\0';
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90 break;
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91 }
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92 } else {
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93 cp++;
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94 }
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95 }
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96 }
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97 *argc = indx;
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98 return cmd_search(__RedBoot_CMD_TAB__, &__RedBoot_CMD_TAB_END__, argv[0]);
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99 }
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100
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101 //
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102 // Search through a list of commands
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103 //
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104 struct cmd *
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105 cmd_search(struct cmd *tab, struct cmd *tabend, char *arg)
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106 {
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107 int cmd_len;
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108 struct cmd *cmd, *cmd2;
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109 // Search command table
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110 cmd_len = strlen(arg);
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111 cmd = tab;
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112 while (cmd != tabend) {
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113 if (strncmpci(arg, cmd->str, cmd_len) == 0) {
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114 if (strlen(cmd->str) > cmd_len) {
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115 // Check for ambiguous commands here
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116 // Note: If there are commands which are not length-unique
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117 // then this check will be invalid. E.g. "du" and "dump"
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118 bool first = true;
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119 cmd2 = tab;
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120 while (cmd2 != tabend) {
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121 if ((cmd != cmd2) &&
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122 (strncmpci(arg, cmd2->str, cmd_len) == 0)) {
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123 if (first) {
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124 printf("Ambiguous command '%s', choices are: %s", arg, cmd->str);
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125 first = false;
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126 }
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127 printf(" %s", cmd2->str);
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128 }
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129 cmd2++;
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130 }
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131 if (!first) {
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132 // At least one ambiguity found - fail the lookup
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133 printf("\n");
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134 return (struct cmd *)0;
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135 }
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136 }
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137 return cmd;
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138 }
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139 cmd++;
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140 }
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141 return (struct cmd *)0;
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142 }
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143
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144 void
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145 cmd_usage(struct cmd *tab, struct cmd *tabend, char *prefix)
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146 {
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147 struct cmd *cmd;
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148 printf("Usage:\n"); for (cmd = tab; cmd != tabend; cmd++) {
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149 printf(" %s%s %s\n", prefix, cmd->str, cmd->usage);
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150 }
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151 }
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152
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153 // Option processing
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154
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155 // Initialize option table entry (required because these entries
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156 // may have dynamic contents, thus cannot be statically initialized)
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157 //
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158 void
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159 init_opts(struct option_info *opts, char flag, bool takes_arg,
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160 int arg_type, void **arg, bool *arg_set, char *name)
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161 {
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162 opts->flag = flag;
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163 opts->takes_arg = takes_arg;
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164 opts->arg_type = arg_type,
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165 opts->arg = arg;
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166 opts->arg_set = arg_set;
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167 opts->name = name;
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168 }
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169
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170 //
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171 // Scan command line arguments (argc/argv), processing options, etc.
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172 //
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173 bool
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174 scan_opts(int argc, char *argv[], int first,
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175 struct option_info *opts, int num_opts,
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176 void **def_arg, int def_arg_type, char *def_descr)
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177 {
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178 bool ret = true;
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179 bool flag_ok;
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180 bool def_arg_set = false;
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181 int i, j;
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182 char c, *s;
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183 struct option_info *opt;
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184
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185 if (def_arg && (def_arg_type == OPTION_ARG_TYPE_STR)) {
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186 *def_arg = (char *)0;
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187 }
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188 opt = opts;
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189 for (j = 0; j < num_opts; j++, opt++) {
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190 if (opt->arg_set) {
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191 *opt->arg_set = false;
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192 }
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193 if (!opt->takes_arg) {
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194 switch (opt->arg_type) {
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195 case OPTION_ARG_TYPE_NUM:
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196 *(int *)opt->arg = 0;
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197 break;
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198 case OPTION_ARG_TYPE_FLG:
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199 *(bool *)opt->arg = false;
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200 break;
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201 }
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202 }
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203 }
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204 for (i = first; i < argc; i++) {
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205 if (argv[i][0] == '-') {
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206 c = argv[i][1];
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207 flag_ok = false;
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208 opt = opts;
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209 for (j = 0; j < num_opts; j++, opt++) {
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210 if (c == opt->flag) {
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211 if (opt->arg_set && *opt->arg_set) {
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212 printf("** Error: %s already specified\n", opt->name);
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213 ret = false;
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214 }
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215 if (opt->takes_arg) {
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216 if (argv[i][2] == '=') {
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217 s = &argv[i][3];
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218 } else {
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219 s = argv[i+1];
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220 i++;
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221 }
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222 switch (opt->arg_type) {
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223 case OPTION_ARG_TYPE_NUM:
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224 if (!parse_num(s, (unsigned long *)opt->arg, 0, 0)) {
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225 printf("** Error: invalid number '%s' for %s\n", s, opt->name);
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226 ret = false;
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227 }
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228 break;
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229 case OPTION_ARG_TYPE_STR:
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230 *opt->arg = s;
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231 break;
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232 }
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233 *opt->arg_set = true;
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234 } else {
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235 switch (opt->arg_type) {
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236 case OPTION_ARG_TYPE_NUM:
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237 *(int *)opt->arg = *(int *)opt->arg + 1;
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238 break;
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239 case OPTION_ARG_TYPE_FLG:
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240 *(bool *)opt->arg = true;
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241 break;
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242 }
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243 }
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244 flag_ok = true;
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245 break;
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246 }
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247 }
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248 if (!flag_ok) {
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249 printf("** Error: invalid flag '%c'\n", c);
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250 ret = false;
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251 }
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252 } else {
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253 if (def_arg) {
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254 if (def_arg_set) {
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255 printf("** Error: %s already specified\n", def_descr);
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256 ret = false;
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257 }
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258 switch (def_arg_type) {
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259 case OPTION_ARG_TYPE_NUM:
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260 if (!parse_num(argv[i], (unsigned long *)def_arg, 0, 0)) {
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261 printf("** Error: invalid number '%s' for %s\n", argv[i], def_descr);
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262 ret = false;
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263 }
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264 break;
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265 case OPTION_ARG_TYPE_STR:
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266 *def_arg = argv[i];
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267 break;
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268 }
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269 def_arg_set = true;
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270 } else {
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271 printf("** Error: no default/non-flag arguments supported\n");
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272 ret = false;
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273 }
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274 }
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275 }
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276 return ret;
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277 }
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278
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279 //
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280 // Parse (scan) a number
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281 //
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282 bool
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283 parse_num(char *s, unsigned long *val, char **es, char *delim)
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284 {
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285 bool first = true;
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286 int radix = 10;
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287 char c;
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288 unsigned long result = 0;
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289 int digit;
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290
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291 while (*s == ' ') s++;
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292 while (*s) {
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293 if (first && (s[0] == '0') && (tolower(s[1]) == 'x')) {
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294 radix = 16;
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295 s += 2;
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296 }
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297 first = false;
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298 c = *s++;
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299 if (_is_hex(c) && ((digit = _from_hex(c)) < radix)) {
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300 // Valid digit
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301 result = (result * radix) + digit;
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302 } else {
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303 if (delim != (char *)0) {
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304 // See if this character is one of the delimiters
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305 char *dp = delim;
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306 while (*dp && (c != *dp)) dp++;
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307 if (*dp) break; // Found a good delimiter
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308 }
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309 return false; // Malformatted number
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310 }
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311 }
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312 *val = result;
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313 if (es != (char **)0) {
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314 *es = s;
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315 }
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316 return true;
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317 }
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318
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319 bool
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320 parse_bool(char *s, bool *val)
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321 {
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322 while (*s == ' ') s++;
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323 if ((*s == 't') || (*s == 'T')) {
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324 *val = true;
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325 } else
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326 if ((*s == 'f') || (*s == 'F')) {
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327 *val = false;
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328 } else {
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329 return false;
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330 }
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331 return true;
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332 }
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333