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annotate packages/redboot/current/src/parse.c @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
parents ea3f0bd33a73
children d2c90368aeef
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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 //==========================================================================
208
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8 //####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later version.
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16 //
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17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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20 // for more details.
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21 //
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22 // You should have received a copy of the GNU General Public License along
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23 // with eCos; if not, write to the Free Software Foundation, Inc.,
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24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 //
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26 // As a special exception, if other files instantiate templates or use macros
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27 // or inline functions from this file, or you compile this file and link it
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28 // with other works to produce a work based on this file, this file does not
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29 // by itself cause the resulting work to be covered by the GNU General Public
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30 // License. However the source code for this file must still be made available
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31 // in accordance with section (3) of the GNU General Public License.
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32 //
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33 // This exception does not invalidate any other reasons why a work based on
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34 // this file might be covered by the GNU General Public License.
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35 //
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36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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37 // at http://sources.redhat.com/ecos/ecos-license
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38 // -------------------------------------------
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39 //####ECOSGPLCOPYRIGHTEND####
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40 //==========================================================================
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41 //#####DESCRIPTIONBEGIN####
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42 //
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43 // Author(s): gthomas
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44 // Contributors: gthomas
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45 // Date: 2000-07-14
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46 // Purpose:
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47 // Description:
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48 //
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49 // This code is part of RedBoot (tm).
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50 //
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51 //####DESCRIPTIONEND####
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52 //
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53 //==========================================================================
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54
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55 #include <redboot.h>
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56 #include <cyg/hal/hal_arch.h>
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57 #include <cyg/hal/hal_intr.h>
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58 #include <cyg/hal/hal_cache.h>
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59 #include CYGHWR_MEMORY_LAYOUT_H
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60 #include <cyg/hal/hal_tables.h>
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61
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62 // Define table boundaries
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63 extern struct cmd __RedBoot_CMD_TAB__[], __RedBoot_CMD_TAB_END__;
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64
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65 //
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66 // Scan through an input line and break it into "arguments". These
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67 // are space delimited strings. Return a structure which points to
183
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68 // the strings, similar to a Unix program. Multiple commands in the line
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69 // are separated by ; similar to sh. If we find a semi we stop processing the
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70 // line, terminate the current command with a null and return the start
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71 // of the next command in *line. parse() can then be called again to
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72 // process the next command on the line.
130
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73 // Note: original input is destroyed by replacing the delimiters with
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74 // null ('\0') characters for ease of use.
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75 //
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76 struct cmd *
183
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77 parse(char **line, int *argc, char **argv)
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78 {
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79 char *cp = *line;
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80 char *pp;
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81 int indx = 0;
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82 int semi = 0;
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83
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84 while (*cp) {
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85 // Skip leading spaces
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86 while (*cp && *cp == ' ') cp++;
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87 if (!*cp) {
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88 break; // Line ended with a string of spaces
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89 }
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90 if (*cp == ';') {
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91 *cp = '\0';
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92 semi=1;
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93 break;
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94 }
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95 if (indx < MAX_ARGV) {
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96 argv[indx++] = cp;
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97 } else {
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98 diag_printf("Too many arguments - stopped at: '%s'\n", cp);
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99 }
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100 while (*cp) {
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101 if (*cp == ' ') {
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102 *cp++ = '\0';
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103 break;
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104 } else if (*cp == ';') {
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105 break;
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106 } else if (*cp == '"') {
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107 // Swallow quote, scan till following one
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108 if (argv[indx-1] == cp) {
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109 argv[indx-1] = ++cp;
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110 }
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111 pp = cp;
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112 while (*cp && *cp != '"') {
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113 if (*cp == '\\') {
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114 // Skip over escape - allows for escaped '"'
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115 cp++;
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116 }
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117 // Move string to swallow escapes
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118 *pp++ = *cp++;
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119 }
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120 if (!*cp) {
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121 diag_printf("Unbalanced string!\n");
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122 } else {
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123 if (pp != cp) *pp = '\0';
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124 *cp++ = '\0';
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125 break;
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126 }
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127 } else {
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128 cp++;
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129 }
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130 }
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131 }
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132 if (semi) {
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133 *line = cp + 1;
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134 } else {
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135 *line = cp;
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136 }
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137 *argc = indx;
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138 return cmd_search(__RedBoot_CMD_TAB__, &__RedBoot_CMD_TAB_END__, argv[0]);
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139 }
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140
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141 //
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142 // Search through a list of commands
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143 //
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144 struct cmd *
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145 cmd_search(struct cmd *tab, struct cmd *tabend, char *arg)
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146 {
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147 int cmd_len;
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148 struct cmd *cmd, *cmd2;
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149 // Search command table
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150 cmd_len = strlen(arg);
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151 cmd = tab;
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152 while (cmd != tabend) {
182
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153 if (strncasecmp(arg, cmd->str, cmd_len) == 0) {
130
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154 if (strlen(cmd->str) > cmd_len) {
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155 // Check for ambiguous commands here
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156 // Note: If there are commands which are not length-unique
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157 // then this check will be invalid. E.g. "du" and "dump"
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158 bool first = true;
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159 cmd2 = tab;
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160 while (cmd2 != tabend) {
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161 if ((cmd != cmd2) &&
182
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162 (strncasecmp(arg, cmd2->str, cmd_len) == 0)) {
130
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163 if (first) {
182
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164 diag_printf("Ambiguous command '%s', choices are: %s",
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165 arg, cmd->str);
130
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166 first = false;
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167 }
182
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168 diag_printf(" %s", cmd2->str);
130
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169 }
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170 cmd2++;
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171 }
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172 if (!first) {
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173 // At least one ambiguity found - fail the lookup
182
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174 diag_printf("\n");
130
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175 return (struct cmd *)0;
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176 }
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177 }
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178 return cmd;
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179 }
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180 cmd++;
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181 }
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182 return (struct cmd *)0;
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183 }
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184
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185 void
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186 cmd_usage(struct cmd *tab, struct cmd *tabend, char *prefix)
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187 {
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188 struct cmd *cmd;
182
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189
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190 diag_printf("Usage:\n");
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191 for (cmd = tab; cmd != tabend; cmd++) {
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192 diag_printf(" %s%s %s\n", prefix, cmd->str, cmd->usage);
130
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193 }
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194 }
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195
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196 // Option processing
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197
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198 // Initialize option table entry (required because these entries
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199 // may have dynamic contents, thus cannot be statically initialized)
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200 //
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201 void
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202 init_opts(struct option_info *opts, char flag, bool takes_arg,
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203 int arg_type, void **arg, bool *arg_set, char *name)
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204 {
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205 opts->flag = flag;
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206 opts->takes_arg = takes_arg;
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207 opts->arg_type = arg_type,
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208 opts->arg = arg;
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209 opts->arg_set = arg_set;
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210 opts->name = name;
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211 }
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212
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213 //
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214 // Scan command line arguments (argc/argv), processing options, etc.
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215 //
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216 bool
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217 scan_opts(int argc, char *argv[], int first,
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218 struct option_info *opts, int num_opts,
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219 void **def_arg, int def_arg_type, char *def_descr)
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220 {
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221 bool ret = true;
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222 bool flag_ok;
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223 bool def_arg_set = false;
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224 int i, j;
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225 char c, *s;
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226 struct option_info *opt;
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227
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228 if (def_arg && (def_arg_type == OPTION_ARG_TYPE_STR)) {
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229 *def_arg = (char *)0;
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230 }
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231 opt = opts;
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232 for (j = 0; j < num_opts; j++, opt++) {
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233 if (opt->arg_set) {
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234 *opt->arg_set = false;
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235 }
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236 if (!opt->takes_arg) {
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237 switch (opt->arg_type) {
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238 case OPTION_ARG_TYPE_NUM:
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239 *(int *)opt->arg = 0;
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240 break;
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241 case OPTION_ARG_TYPE_FLG:
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242 *(bool *)opt->arg = false;
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243 break;
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244 }
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245 }
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246 }
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247 for (i = first; i < argc; i++) {
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248 if (argv[i][0] == '-') {
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249 c = argv[i][1];
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250 flag_ok = false;
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251 opt = opts;
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252 for (j = 0; j < num_opts; j++, opt++) {
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253 if (c == opt->flag) {
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254 if (opt->arg_set && *opt->arg_set) {
182
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255 diag_printf("** Error: %s already specified\n", opt->name);
130
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256 ret = false;
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257 }
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258 if (opt->takes_arg) {
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259 if (argv[i][2] == '=') {
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260 s = &argv[i][3];
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261 } else {
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262 s = argv[i+1];
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263 i++;
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264 }
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265 switch (opt->arg_type) {
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266 case OPTION_ARG_TYPE_NUM:
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267 if (!parse_num(s, (unsigned long *)opt->arg, 0, 0)) {
182
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268 diag_printf("** Error: invalid number '%s' for %s\n",
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269 s, opt->name);
130
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270 ret = false;
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271 }
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272 break;
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273 case OPTION_ARG_TYPE_STR:
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274 *opt->arg = s;
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275 break;
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276 }
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277 *opt->arg_set = true;
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278 } else {
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279 switch (opt->arg_type) {
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280 case OPTION_ARG_TYPE_NUM:
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281 *(int *)opt->arg = *(int *)opt->arg + 1;
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282 break;
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283 case OPTION_ARG_TYPE_FLG:
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284 *(bool *)opt->arg = true;
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285 break;
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286 }
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287 }
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288 flag_ok = true;
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289 break;
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290 }
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291 }
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292 if (!flag_ok) {
182
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293 diag_printf("** Error: invalid flag '%c'\n", c);
130
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294 ret = false;
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295 }
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296 } else {
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297 if (def_arg) {
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298 if (def_arg_set) {
182
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299 diag_printf("** Error: %s already specified\n", def_descr);
130
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300 ret = false;
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301 }
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302 switch (def_arg_type) {
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303 case OPTION_ARG_TYPE_NUM:
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304 if (!parse_num(argv[i], (unsigned long *)def_arg, 0, 0)) {
182
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305 diag_printf("** Error: invalid number '%s' for %s\n",
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306 argv[i], def_descr);
130
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307 ret = false;
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308 }
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309 break;
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310 case OPTION_ARG_TYPE_STR:
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311 *def_arg = argv[i];
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312 break;
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313 }
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314 def_arg_set = true;
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315 } else {
182
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316 diag_printf("** Error: no default/non-flag arguments supported\n");
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317 ret = false;
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318 }
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319 }
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320 }
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321 return ret;
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322 }
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323
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324 //
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325 // Parse (scan) a number
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326 //
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327 bool
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328 parse_num(char *s, unsigned long *val, char **es, char *delim)
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329 {
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330 bool first = true;
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331 int radix = 10;
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332 char c;
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333 unsigned long result = 0;
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334 int digit;
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335
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336 while (*s == ' ') s++;
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337 while (*s) {
182
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338 if (first && (s[0] == '0') && (_tolower(s[1]) == 'x')) {
130
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339 radix = 16;
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340 s += 2;
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341 }
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342 first = false;
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343 c = *s++;
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344 if (_is_hex(c) && ((digit = _from_hex(c)) < radix)) {
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345 // Valid digit
143
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346 #ifdef CYGPKG_HAL_MIPS
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347 // FIXME: tx49 compiler generates 0x2539018 for MUL which
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348 // isn't any good.
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349 if (16 == radix)
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350 result = result << 4;
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351 else
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352 result = 10 * result;
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353 result += digit;
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354 #else
130
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355 result = (result * radix) + digit;
143
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356 #endif
130
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357 } else {
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358 if (delim != (char *)0) {
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359 // See if this character is one of the delimiters
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360 char *dp = delim;
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361 while (*dp && (c != *dp)) dp++;
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362 if (*dp) break; // Found a good delimiter
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363 }
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364 return false; // Malformatted number
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365 }
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366 }
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367 *val = result;
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368 if (es != (char **)0) {
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369 *es = s;
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370 }
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371 return true;
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372 }
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373
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374 bool
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375 parse_bool(char *s, bool *val)
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376 {
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377 while (*s == ' ') s++;
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378 if ((*s == 't') || (*s == 'T')) {
198
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379 char *p = "rue";
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380 char *P = "RUE";
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381 // check for (partial) rest of the word and no extra including the
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382 // terminating zero. "tru" will match; "truef" will not.
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383 while ( *++s ) {
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384 if ( *p != *s && *P != *s ) return false;
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385 p++; P++;
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386 }
130
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387 *val = true;
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388 } else
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389 if ((*s == 'f') || (*s == 'F')) {
198
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390 char *p = "alse";
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391 char *P = "ALSE";
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392 while ( *++s ) {
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393 if ( *p != *s && *P != *s ) return false;
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394 p++; P++;
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395 }
130
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396 *val = false;
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397 } else {
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398 return false;
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399 }
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400 return true;
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401 }
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402