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annotate packages/redboot/current/src/alias.c @ 1475:c9e09b1c18cb

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Fix for building without GDB stubs
author gthomas
date Sun, 18 Jan 2004 17:42:47 +0000
parents dbcfe4e0dbd2
children 6beba10c1713
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 Red Hat, Inc.
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12 // Copyright (C) 2003 Gary Thomas
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13 //
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14 // eCos is free software; you can redistribute it and/or modify it under
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15 // the terms of the GNU General Public License as published by the Free
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16 // Software Foundation; either version 2 or (at your option) any later version.
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17 //
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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19 // 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 along
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24 // with eCos; if not, write to the Free Software Foundation, Inc.,
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25 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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26 //
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27 // As a special exception, if other files instantiate templates or use macros
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28 // or inline functions from this file, or you compile this file and link it
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29 // with other works to produce a work based on this file, this file does not
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30 // by itself cause the resulting work to be covered by the GNU General Public
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31 // License. However the source code for this file must still be made available
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32 // in accordance with section (3) of the GNU General Public License.
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33 //
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34 // This exception does not invalidate any other reasons why a work based on
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35 // this file might be covered by the GNU General Public License.
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36 //
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37 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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38 // at http://sources.redhat.com/ecos/ecos-license/
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39 // -------------------------------------------
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40 //####ECOSGPLCOPYRIGHTEND####
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41 //==========================================================================
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42 //#####DESCRIPTIONBEGIN####
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43 //
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44 // Author(s): gthomas
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45 // Contributors: gthomas, jskov
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46 // Date: 2002-05-15
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47 // Purpose:
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48 // Description:
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49 //
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50 // This code is part of RedBoot (tm).
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51 //
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52 //####DESCRIPTIONEND####
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53 //
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54 //==========================================================================
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55
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56 #include <redboot.h>
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57
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58 #ifdef CYGNUM_REDBOOT_FLASH_STRING_SIZE
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59 # define MAX_STRING_LENGTH CYGNUM_REDBOOT_FLASH_STRING_SIZE
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60 #else
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61 # define MAX_STRING_LENGTH 32
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62 #endif
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63
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64 // Lookup an alias. First try plain string aliases. If that fails try
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65 // other types so allowing access to all configured values. This allows
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66 // for alias (macro) expansion of normal 'fconfig' data, such as the
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67 // board IP address.
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68 static char *
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69 lookup_alias(char *alias, char *alias_buf)
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70 {
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71 if (0 == strcasecmp("FREEMEMLO", alias)) {
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72 diag_sprintf(alias_buf,"%p", ((CYG_ADDRWORD)mem_segments[0].start + 0x03ff) & ~0x03ff);
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73 return alias_buf;
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74 } else if (0 == strcasecmp("FREEMEMHI", alias)) {
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75 diag_sprintf(alias_buf,"%p", ((CYG_ADDRWORD)mem_segments[0].end) & ~0x03ff);
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76 return alias_buf;
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77 }
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78
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79 #ifdef CYGSEM_REDBOOT_FLASH_ALIASES
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80 return flash_lookup_alias(alias, alias_buf);
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81 #else
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82 return NULL;
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83 #endif
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84 }
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85
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86 // Expand aliases, this is recursive. ie if one alias contains other
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87 // aliases, these will also be expanded from the insertion point
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88 // onwards.
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89 //
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90 // If 'iter' is zero, then quoted strings are not expanded
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91 //
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92 static bool
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93 _expand_aliases(char *line, int len, int iter)
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94 {
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95 char *lp = line;
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96 char *ms, *me, *ep;
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97 char *alias;
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98 char c;
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99 int offset, line_len, alias_len;
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100 char alias_buf[MAX_STRING_LENGTH];
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101 bool macro_found = false;
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102
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103 if ((line_len = strlen(line)) != 0) {
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104 while (*lp) {
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105 c = *lp++;
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106 if ((c == '%') && (*lp == '{')) {
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107 // Found a macro/alias to expand
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108 ms = lp+1;
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109 lp += 2;
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110 while (*lp && (*lp != '}')) lp++;
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111 if (!*lp) {
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112 diag_printf("Invalid macro/alias '%s'\n", ms);
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113 line[0] = '\0'; // Destroy line
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114 return false;
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115 }
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116 me = lp;
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117 *me = '\0';
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118 lp++;
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119 if ((alias = lookup_alias(ms,alias_buf)) != (char *)NULL) {
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120 alias_len = strlen(alias);
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121 // See if there is room in the line to expand this macro/alias
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122 if ((line_len+alias_len) < len) {
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123 // Make a hole by moving data within the line
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124 offset = alias_len-strlen(ms)-2; // Number of bytes being inserted
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125 ep = &lp[strlen(lp)-1];
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126 if (offset > 1) {
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127 ep[offset] = '\0';
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128 while (ep != (lp-1)) {
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129 ep[offset-1] = *ep;
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130 ep--;
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131 }
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132 } else {
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133 if (offset <=0) {
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134 while ((lp-1) != ep) {
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135 lp[offset-1] = *lp;
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136 lp++;
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137 }
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138 lp[offset-1]='\0';
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139 }
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140 }
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141 // Insert the macro/alias data
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142 lp = ms-2;
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143 while (*alias) {
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144 if ((alias[0] == '%') && (alias[1] == '{')) macro_found = true;
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145 *lp++ = *alias++;
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146 }
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147 line_len = strlen(line);
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148 lp = lp - alias_len;
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149 } else {
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150 diag_printf("No room to expand '%s'\n", ms);
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151 line[0] = '\0'; // Destroy line
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152 return false;
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153 }
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154 } else {
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155 diag_printf("Alias '%s' not defined\n", ms);
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156 *me = '|';
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157 }
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158 } else if ((c == '"') && (iter == 0)) {
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159 // Skip quoted strings
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160 while (*lp && (*lp != '"')) lp++;
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161 }
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162 }
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163 }
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164 return macro_found;
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165 }
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166
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167 void
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168 expand_aliases(char *line, int len)
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169 {
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170 int iter = 0;
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171
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172 while (_expand_aliases(line, len, iter++)) {
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173 }
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174 }