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1 /* |
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2 |
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1884
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3 Copyright (C) 1996 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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240
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23 #ifdef HAVE_CONFIG_H |
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24 #include <config.h> |
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25 #endif |
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26 |
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1343
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27 #include <cstdarg> |
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28 #include <cstring> |
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29 |
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30 #include <string> |
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31 |
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581
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32 #include <strstream.h> |
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33 |
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1352
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34 #include "defun.h" |
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35 #include "error.h" |
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36 #include "pager.h" |
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37 #include "pt-const.h" |
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38 #include "oct-obj.h" |
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39 #include "utils.h" |
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40 |
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41 // TRUE means that Octave will try to beep obnoxiously before printing |
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42 // error messages. |
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43 static bool Vbeep_on_error; |
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44 |
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143
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45 // Current error state. |
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46 int error_state = 0; |
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47 |
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48 // Tell the error handler whether to print messages, or just store |
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49 // them for later. Used for handling errors in eval() and |
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50 // the `unwind_protect' statement. |
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51 int buffer_error_messages; |
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52 |
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53 // The message buffer |
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54 ostrstream *error_message_buffer = 0; |
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143
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55 |
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56 static void |
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57 verror (const char *name, const char *fmt, va_list args) |
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58 { |
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59 flush_octave_stdout (); |
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60 |
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61 bool to_beep_or_not_to_beep_p = Vbeep_on_error && ! error_state; |
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62 |
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63 ostrstream output_buf; |
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64 |
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65 if (to_beep_or_not_to_beep_p) |
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66 output_buf << "\a"; |
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67 if (name) |
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68 output_buf << name << ": "; |
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69 output_buf.vform (fmt, args); |
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70 output_buf << endl << ends; |
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71 |
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72 char *msg = output_buf.str (); |
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73 |
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74 if (buffer_error_messages) |
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75 { |
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76 char *ptr = msg; |
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77 |
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78 if (! error_message_buffer) |
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79 { |
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80 error_message_buffer = new ostrstream; |
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81 |
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82 // XXX FIXME XXX -- this is ugly, but it prevents |
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83 // |
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84 // eval ("error (\"msg\")", "error (__error_text__)"); |
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85 // |
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86 // from printing `error: ' twice. Assumes that the NAME we |
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87 // have been given doesn't contain `:'. |
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88 |
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89 ptr = strchr (msg, ':') + 2; |
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90 ptr = ptr ? ptr : msg; |
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91 } |
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92 |
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93 *error_message_buffer << ptr; |
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94 } |
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95 else |
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96 { |
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97 octave_diary << msg; |
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98 cerr << msg; |
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99 } |
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100 |
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101 delete [] msg; |
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102 } |
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103 |
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104 // Note that we don't actually print any message if the error string |
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105 // is just "" or "\n". This allows error ("") and error ("\n") to |
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106 // just set the error state. |
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107 |
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108 static void |
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109 error_1 (const char *name, const char *fmt, va_list args) |
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110 { |
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111 if (error_state != -2) |
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112 { |
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113 if (fmt) |
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114 { |
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115 if (*fmt) |
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116 { |
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117 int len = strlen (fmt); |
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118 if (fmt[len - 1] == '\n') |
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119 { |
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120 if (len > 1) |
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121 { |
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122 char *tmp_fmt = strsave (fmt); |
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123 tmp_fmt[len - 1] = '\0'; |
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124 verror (name, tmp_fmt, args); |
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125 delete [] tmp_fmt; |
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126 } |
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127 |
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128 error_state = -2; |
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129 } |
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130 else |
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131 verror (name, fmt, args); |
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132 } |
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133 } |
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134 else |
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135 panic ("error_1: invalid format"); |
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136 |
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137 if (! error_state) |
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138 error_state = 1; |
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139 } |
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140 } |
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141 |
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142 void |
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143 message (const char *name, const char *fmt, ...) |
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144 { |
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145 va_list args; |
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146 va_start (args, fmt); |
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147 verror (name, fmt, args); |
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148 va_end (args); |
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149 } |
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150 |
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151 void |
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152 usage (const char *fmt, ...) |
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153 { |
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154 va_list args; |
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155 va_start (args, fmt); |
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156 error_state = -1; |
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157 verror ("usage", fmt, args); |
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158 va_end (args); |
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159 } |
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160 |
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161 void |
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162 warning (const char *fmt, ...) |
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163 { |
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164 va_list args; |
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165 va_start (args, fmt); |
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166 verror ("warning", fmt, args); |
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167 va_end (args); |
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168 } |
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169 |
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170 void |
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171 error (const char *fmt, ...) |
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172 { |
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173 va_list args; |
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174 va_start (args, fmt); |
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175 error_1 ("error", fmt, args); |
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176 va_end (args); |
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177 } |
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178 |
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179 void |
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180 parse_error (const char *fmt, ...) |
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181 { |
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182 va_list args; |
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183 va_start (args, fmt); |
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184 error_1 (0, fmt, args); |
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185 va_end (args); |
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186 } |
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187 |
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189
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188 void |
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189 panic (const char *fmt, ...) |
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190 { |
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191 flush_octave_stdout (); |
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192 |
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193 va_list args; |
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194 va_start (args, fmt); |
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195 verror ("panic", fmt, args); |
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196 va_end (args); |
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197 abort (); |
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198 } |
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199 |
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200 typedef void (*error_fun)(const char *, ...); |
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201 |
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202 extern octave_value_list Fsprintf (const octave_value_list&, int); |
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203 |
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204 static octave_value_list |
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205 handle_message (error_fun f, const char *msg, const octave_value_list& args) |
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528
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206 { |
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207 octave_value_list retval; |
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208 |
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209 string tstr; |
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210 |
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211 int nargin = args.length (); |
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212 |
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213 octave_value arg = ((nargin > 1) ? Fsprintf (args, 1) : args) (0); |
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214 |
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215 if (arg.is_defined ()) |
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216 { |
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217 if (arg.is_string ()) |
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218 { |
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219 tstr = arg.string_value (); |
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220 msg = tstr.c_str (); |
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221 |
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222 if (! msg) |
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223 return retval; |
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224 } |
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225 else if (arg.is_empty ()) |
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226 return retval; |
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227 } |
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228 |
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229 // Ugh. |
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230 |
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231 int len = strlen (msg); |
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232 if (msg[len - 1] == '\n') |
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233 { |
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234 if (len > 1) |
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235 { |
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236 char *tmp_msg = strsave (msg); |
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237 tmp_msg[len - 1] = '\0'; |
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238 f ("%s\n", tmp_msg); |
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239 delete [] tmp_msg; |
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240 } |
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241 } |
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242 else |
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243 f ("%s", msg); |
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244 |
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245 return retval; |
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246 } |
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247 |
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248 DEFUN (error, args, , |
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249 "error (FMT, ...): print message according to FMT and set error state.\n\ |
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250 \n\ |
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251 This should eventually take us up to the top level, possibly\n\ |
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252 printing traceback messages as we go.\n\ |
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253 \n\ |
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254 If MESSAGE ends in a newline character, traceback messages are not\n\ |
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255 printed.\n\ |
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256 \n\ |
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257 See also: printf") |
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897
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258 { |
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259 return handle_message (error, "unspecified error", args); |
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260 } |
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261 |
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262 DEFUN (warning, args, , |
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263 "warning (FMT, ...): print a warning message according to FMT.\n\ |
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264 \n\ |
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265 See also: error, printf") |
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266 { |
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267 return handle_message (warning, "unspecified warning", args); |
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268 } |
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269 |
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270 DEFUN (usage, args, , |
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271 "usage (FMT, ...): print a usage message according to FMT.\n\ |
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272 \n\ |
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273 See also: error, printf") |
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274 { |
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275 return handle_message (usage, "unknown", args); |
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276 } |
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277 |
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278 static int |
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279 beep_on_error (void) |
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280 { |
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281 Vbeep_on_error = check_preference ("beep_on_error"); |
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282 |
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283 return 0; |
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284 } |
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285 |
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286 void |
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287 symbols_of_error (void) |
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288 { |
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289 DEFVAR (beep_on_error, 0.0, 0, beep_on_error, |
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290 "if true, beep before printing error messages"); |
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291 } |
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292 |
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293 /* |
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294 ;;; Local Variables: *** |
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295 ;;; mode: C++ *** |
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296 ;;; End: *** |
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297 */ |
