FreeCalypso > hg > freecalypso-sw
annotate rvinterf/old/format_g23.c @ 1034:405b5469abc4 default tip
top README: repository change notice
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 12 Jun 2016 19:06:34 +0000 |
parents | 73a2b359b3cd |
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rev | line source |
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1 /* |
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2 * This module implements the decoding of G23 trace packets into |
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3 * human-readable form - or more precisely, traces, system primitives |
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4 * and other packets that can be emitted through GPF on targets. |
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5 * The decoding is based on my (Space Falcon's) understanding |
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6 * of the packet format, which is in turn based on the GPF sources |
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7 * available to us, now integrated under gsm-fw/gpf. |
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8 */ |
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9 |
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10 #include <sys/types.h> |
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11 #include <ctype.h> |
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12 #include <stdio.h> |
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13 #include <string.h> |
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14 #include <strings.h> |
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15 #include "../include/pktmux.h" |
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16 #include "../include/limits.h" |
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17 |
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18 extern u_char rxpkt[]; |
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19 extern size_t rxpkt_len; |
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20 extern char fmtbuf[]; |
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21 |
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22 static char *fmtbuf_ptr; |
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23 |
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24 static int |
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25 basic_checks() |
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26 { |
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27 int i, c; |
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28 |
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29 if (rxpkt_len < 17) |
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30 return(0); |
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31 /* check version bits in the header byte */ |
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32 if ((rxpkt[1] & 0xC0) != 0x80) |
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33 return(0); |
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34 /* check the length */ |
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35 c = rxpkt[2] | rxpkt[3] << 8; |
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36 if (c + 4 != rxpkt_len) |
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37 return(0); |
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38 /* ensure that the "from" and "to" are printable ASCII */ |
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39 for (i = 8; i < 16; i++) { |
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40 c = rxpkt[i]; |
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41 if (c < ' ' || c > '~') |
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42 return(0); |
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43 } |
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44 /* basic checks pass */ |
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45 return(1); |
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46 } |
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47 |
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48 static int |
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49 psprim_extra_checks() |
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50 { |
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51 int i, c; |
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52 |
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53 if (rxpkt_len < 24) |
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54 return(0); |
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55 /* "original rcvr" field needs to be printable ASCII */ |
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56 for (i = 16; i < 20; i++) { |
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57 c = rxpkt[i]; |
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58 if (c < ' ' || c > '~') |
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59 return(0); |
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60 } |
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61 /* checks pass */ |
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62 return(1); |
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63 } |
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64 |
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65 static void |
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66 print_malformed() |
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67 { |
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68 int i; |
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69 char *dp; |
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70 |
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71 dp = fmtbuf; |
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72 strcpy(dp, "G23 UNK:"); |
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73 dp += 8; |
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74 for (i = 1; i < rxpkt_len; i++) { |
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75 sprintf(dp, " %02X", rxpkt[i]); |
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76 dp += 3; |
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77 } |
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78 *dp = '\0'; |
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79 output_line(fmtbuf); |
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80 } |
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81 |
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82 static int |
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83 entity_name_well_formed(p) |
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84 char *p; |
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85 { |
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86 int i, len; |
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87 |
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88 if (!isupper(p[0])) |
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89 return(0); |
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90 for (i = 0; i < 4; i++) |
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91 if (!isalnum(p[i])) |
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92 break; |
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93 len = i; |
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94 for (; i < 4; i++) |
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95 if (p[i] != ' ') |
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96 return(0); |
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97 return(len); |
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98 } |
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99 |
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100 static void |
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101 print_entity_name(raw) |
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102 char *raw; |
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103 { |
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104 int len; |
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105 |
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106 len = entity_name_well_formed(raw); |
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107 if (len) |
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108 sprintf(fmtbuf_ptr, "%.*s", len, raw); |
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109 else |
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110 sprintf(fmtbuf_ptr, "\"%.4s\"", raw); |
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111 fmtbuf_ptr = index(fmtbuf_ptr, '\0'); |
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112 } |
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113 |
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114 static void |
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115 print_common_hdr(typestr) |
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116 char *typestr; |
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117 { |
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118 sprintf(fmtbuf, "G23 %s id=%02X ts=%02X%02X%02X%02X ", typestr, |
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119 rxpkt[1], rxpkt[7], rxpkt[6], rxpkt[5], rxpkt[4]); |
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120 fmtbuf_ptr = index(fmtbuf, '\0'); |
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121 print_entity_name(rxpkt + 8); |
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122 *fmtbuf_ptr++ = '-'; |
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123 *fmtbuf_ptr++ = '>'; |
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124 print_entity_name(rxpkt + 12); |
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125 *fmtbuf_ptr++ = ' '; |
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126 } |
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127 |
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128 static void |
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129 format_text(start_off) |
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130 { |
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131 int i, c; |
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132 |
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133 *fmtbuf_ptr++ = '\"'; |
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134 for (i = start_off; i < rxpkt_len; i++) { |
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135 c = rxpkt[i]; |
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136 if (c & 0x80) { |
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137 *fmtbuf_ptr++ = 'M'; |
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138 *fmtbuf_ptr++ = '-'; |
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139 c &= 0x7F; |
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140 } |
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141 if (c < 0x20) { |
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142 *fmtbuf_ptr++ = '^'; |
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143 *fmtbuf_ptr++ = c + '@'; |
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144 } else if (c == 0x7F) { |
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145 *fmtbuf_ptr++ = '^'; |
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146 *fmtbuf_ptr++ = '?'; |
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147 } else |
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148 *fmtbuf_ptr++ = c; |
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149 } |
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150 *fmtbuf_ptr++ = '\"'; |
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151 *fmtbuf_ptr = '\0'; |
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152 output_line(fmtbuf); |
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153 } |
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154 |
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155 static void |
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156 format_compressed_trace(start_off) |
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157 { |
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158 int i; |
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159 |
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160 i = start_off + 1; |
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161 sprintf(fmtbuf_ptr, "%d", rxpkt[i+1] << 8 | rxpkt[i]); |
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162 fmtbuf_ptr = index(fmtbuf_ptr, '\0'); |
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163 i += 4; |
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164 for (; i < rxpkt_len; i++) { |
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165 sprintf(fmtbuf_ptr, " %02X", rxpkt[i]); |
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166 fmtbuf_ptr += 3; |
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167 } |
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168 *fmtbuf_ptr = '\0'; |
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169 output_line(fmtbuf); |
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170 } |
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171 |
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172 static void |
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173 format_trace() |
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174 { |
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175 int i; |
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176 |
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177 i = 16; |
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178 if (rxpkt[i] < 0x20) { |
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179 sprintf(fmtbuf_ptr, "tc=%02X ", rxpkt[i]); |
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180 fmtbuf_ptr += 6; |
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181 i++; |
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182 } |
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183 if (rxpkt_len - i >= 5 && rxpkt[i] == '%' && |
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184 !rxpkt[i+3] && !rxpkt[i+4]) |
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|
185 format_compressed_trace(i); |
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|
186 else |
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187 format_text(i); |
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188 } |
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189 |
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190 static void |
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191 format_psprim() |
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192 { |
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|
193 int i; |
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194 |
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195 /* original destination */ |
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196 *fmtbuf_ptr++ = '('; |
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197 print_entity_name(rxpkt + 16); |
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198 *fmtbuf_ptr++ = ')'; |
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199 /* opcode */ |
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|
200 sprintf(fmtbuf_ptr, " %02X%02X%02X%02X", |
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|
201 rxpkt[23], rxpkt[22], rxpkt[21], rxpkt[20]); |
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202 fmtbuf_ptr += 9; |
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203 for (i = 24; i < rxpkt_len; i++) { |
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|
204 sprintf(fmtbuf_ptr, " %02X", rxpkt[i]); |
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|
205 fmtbuf_ptr += 3; |
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|
206 } |
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|
207 *fmtbuf_ptr = '\0'; |
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208 output_line(fmtbuf); |
133
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209 } |
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|
210 |
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211 void |
175
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diff
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|
212 print_g23_trace() |
169
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213 { |
327
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|
214 if (!basic_checks()) { |
175
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174
diff
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|
215 print_malformed(); |
327
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diff
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|
216 return; |
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|
217 } |
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|
218 /* dispatch by type */ |
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219 switch (rxpkt[1] & 0x30) { |
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220 case 0x10: |
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221 /* PS primitive */ |
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222 if (psprim_extra_checks()) { |
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223 print_common_hdr("PSprim"); |
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224 format_psprim(); |
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225 } else |
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226 print_malformed(); |
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227 return; |
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228 case 0x20: |
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229 /* trace */ |
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230 print_common_hdr("trace"); |
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231 format_trace(); |
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232 return; |
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233 case 0x30: |
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234 /* system primitive */ |
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235 print_common_hdr("sysprim"); |
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236 format_text(16); |
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237 return; |
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238 default: |
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239 print_malformed(); |
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240 } |
169
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241 } |