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annotate packages/redboot/current/src/alias.c @ 2729:74dbf4c3f2e1 after-copyright-change-20090129

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Update all copyright banners to reflect FSF ownership; fix and improve licence text.
author jlarmour
date Thu, 29 Jan 2009 17:47:46 +0000
parents 161f7ed272df
children
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1 //==========================================================================
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2 //
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3 // alias.c
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4 //
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5 // RedBoot - alias support
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6 //
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7 //==========================================================================
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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, 2003 Free Software Foundation, 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
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16 // version.
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17 //
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT
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19 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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21 // for more details.
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22 //
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23 // You should have received a copy of the GNU General Public License
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24 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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25 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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26 //
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27 // As a special exception, if other files instantiate templates or use
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28 // macros or inline functions from this file, or you compile this file
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29 // and link it with other works to produce a work based on this file,
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30 // this file does not by itself cause the resulting work to be covered by
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31 // the GNU General Public License. However the source code for this file
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32 // must still be made available in accordance with section (3) of the GNU
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33 // General Public License v2.
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34 //
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35 // This exception does not invalidate any other reasons why a work based
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36 // on this file might be covered by the GNU General Public License.
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37 // -------------------------------------------
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38 // ####ECOSGPLCOPYRIGHTEND####
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39 //==========================================================================
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40 //#####DESCRIPTIONBEGIN####
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41 //
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42 // Author(s): gthomas
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43 // Contributors: gthomas, jskov
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44 // Date: 2002-05-15
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45 // Purpose:
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46 // Description:
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47 //
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48 // This code is part of RedBoot (tm).
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49 //
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50 //####DESCRIPTIONEND####
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51 //
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52 //==========================================================================
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53
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54 #include <redboot.h>
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55
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56 #ifdef CYGNUM_REDBOOT_FLASH_STRING_SIZE
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57 # define MAX_STRING_LENGTH CYGNUM_REDBOOT_FLASH_STRING_SIZE
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58 #else
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59 # define MAX_STRING_LENGTH 32
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60 #endif
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61
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62 // Lookup an alias. First try plain string aliases. If that fails try
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63 // other types so allowing access to all configured values. This allows
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64 // for alias (macro) expansion of normal 'fconfig' data, such as the
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65 // board IP address.
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66 static char *
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67 lookup_alias(char *alias, char *alias_buf)
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68 {
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69 if (0 == strcasecmp("FREEMEMLO", alias)) {
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70 diag_sprintf(alias_buf,"0x%x", ((CYG_ADDRWORD)mem_segments[0].start + 0x03ff) & ~0x03ff);
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71 return alias_buf;
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72 } else if (0 == strcasecmp("FREEMEMHI", alias)) {
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73 diag_sprintf(alias_buf,"0x%x", ((CYG_ADDRWORD)mem_segments[0].end) & ~0x03ff);
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74 return alias_buf;
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75 }
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76
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77 #ifdef CYGSEM_REDBOOT_FLASH_ALIASES
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78 return flash_lookup_alias(alias, alias_buf);
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79 #else
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80 return NULL;
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81 #endif
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82 }
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83
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84 // Expand aliases, this is recursive. ie if one alias contains other
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85 // aliases, these will also be expanded from the insertion point
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86 // onwards.
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87 //
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88 // If 'iter' is zero, then quoted strings are not expanded
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89 //
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90 static bool
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91 _expand_aliases(char *line, int len, int iter)
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92 {
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93 char *lp = line;
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94 char *ms, *me, *ep;
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95 char *alias;
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96 char c;
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97 int offset, line_len, alias_len;
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98 char alias_buf[MAX_STRING_LENGTH];
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99 bool macro_found = false;
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100
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101 if ((line_len = strlen(line)) != 0) {
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102 while (*lp) {
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103 c = *lp++;
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104 if ((c == '%') && (*lp == '{')) {
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105 // Found a macro/alias to expand
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106 ms = lp+1;
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107 lp += 2;
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108 while (*lp && (*lp != '}')) lp++;
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109 if (!*lp) {
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110 diag_printf("Invalid macro/alias '%s'\n", ms);
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111 line[0] = '\0'; // Destroy line
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112 return false;
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113 }
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114 me = lp;
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115 *me = '\0';
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116 lp++;
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117 if ((alias = lookup_alias(ms,alias_buf)) != (char *)NULL) {
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118 alias_len = strlen(alias);
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119 // See if there is room in the line to expand this macro/alias
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120 if ((line_len+alias_len) < len) {
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121 // Make a hole by moving data within the line
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122 offset = alias_len-strlen(ms)-2; // Number of bytes being inserted
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123 ep = &lp[strlen(lp)-1];
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124 if (offset > 1) {
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125 ep[offset] = '\0';
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126 while (ep != (lp-1)) {
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127 ep[offset-1] = *ep;
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128 ep--;
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129 }
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130 } else {
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131 if (offset <=0) {
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132 while ((lp-1) != ep) {
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133 lp[offset-1] = *lp;
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134 lp++;
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135 }
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136 lp[offset-1]='\0';
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137 }
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138 }
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139 // Insert the macro/alias data
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140 lp = ms-2;
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141 while (*alias) {
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142 if ((alias[0] == '%') && (alias[1] == '{')) macro_found = true;
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143 *lp++ = *alias++;
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144 }
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145 line_len = strlen(line);
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146 lp = lp - alias_len;
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147 } else {
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148 diag_printf("No room to expand '%s'\n", ms);
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149 line[0] = '\0'; // Destroy line
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150 return false;
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151 }
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152 } else {
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153 diag_printf("Alias '%s' not defined\n", ms);
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154 *me = '|';
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155 }
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156 } else if ((c == '"') && (iter == 0)) {
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157 // Skip quoted strings
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158 while (*lp && (*lp != '"')) lp++;
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159 }
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160 }
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161 }
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162 return macro_found;
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163 }
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164
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165 void
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166 expand_aliases(char *line, int len)
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167 {
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168 int iter = 0;
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169
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170 while (_expand_aliases(line, len, iter++)) {
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171 }
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172 }