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1 // error.cc -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1996 John W. Eaton |
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5 |
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6 This file is part of Octave. |
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7 |
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8 Octave is free software; you can redistribute it and/or modify it |
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9 under the terms of the GNU General Public License as published by the |
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10 Free Software Foundation; either version 2, or (at your option) any |
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11 later version. |
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12 |
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13 Octave is distributed in the hope that it will be useful, but WITHOUT |
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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16 for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License |
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19 along with Octave; see the file COPYING. If not, write to the Free |
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20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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21 |
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22 */ |
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23 |
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240
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24 #ifdef HAVE_CONFIG_H |
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25 #include <config.h> |
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26 #endif |
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27 |
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28 #include <cstdarg> |
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29 #include <cstring> |
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30 |
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31 #include <string> |
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32 |
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33 #include <strstream.h> |
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34 |
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35 #include "defun.h" |
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36 #include "error.h" |
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37 #include "pager.h" |
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38 #include "pt-const.h" |
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39 #include "oct-obj.h" |
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40 #include "user-prefs.h" |
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41 #include "utils.h" |
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42 |
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143
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43 // Current error state. |
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44 int error_state = 0; |
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45 |
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46 // Tell the error handler whether to print messages, or just store |
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47 // them for later. Used for handling errors in eval() and |
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48 // the `unwind_protect' statement. |
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49 int buffer_error_messages; |
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50 |
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51 // The message buffer |
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52 ostrstream *error_message_buffer = 0; |
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143
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53 |
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54 static void |
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55 verror (const char *name, const char *fmt, va_list args) |
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56 { |
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57 flush_output_to_pager (); |
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58 |
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59 int to_beep_or_not_to_beep = user_pref.beep_on_error && ! error_state; |
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60 |
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61 ostrstream output_buf; |
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62 |
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63 if (to_beep_or_not_to_beep) |
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64 output_buf << "\a"; |
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65 if (name) |
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66 output_buf << name << ": "; |
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67 output_buf.vform (fmt, args); |
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68 output_buf << endl << ends; |
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69 |
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70 char *msg = output_buf.str (); |
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71 |
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72 if (buffer_error_messages) |
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73 { |
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74 char *ptr = msg; |
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75 |
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76 if (! error_message_buffer) |
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77 { |
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78 error_message_buffer = new ostrstream; |
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79 |
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80 // XXX FIXME XXX -- this is ugly, but it prevents |
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81 // |
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82 // eval ("error (\"msg\")", "error (__error_text__)"); |
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83 // |
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84 // from printing `error: ' twice. Assumes that the NAME we |
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85 // have been given doesn't contain `:'. |
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86 |
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87 ptr = strchr (msg, ':') + 2; |
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88 ptr = ptr ? ptr : msg; |
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89 } |
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90 |
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91 *error_message_buffer << ptr; |
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92 } |
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93 else |
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94 { |
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95 maybe_write_to_diary_file (msg); |
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96 cerr << msg; |
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97 } |
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98 |
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99 delete [] msg; |
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100 } |
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101 |
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102 // Note that we don't actually print any message if the error string |
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103 // is just "" or "\n". This allows error ("") and error ("\n") to |
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104 // just set the error state. |
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105 |
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106 static void |
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107 error_1 (const char *name, const char *fmt, va_list args) |
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108 { |
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109 if (error_state != -2) |
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110 { |
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111 if (fmt) |
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112 { |
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113 if (*fmt) |
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114 { |
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115 int len = strlen (fmt); |
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116 if (fmt[len - 1] == '\n') |
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117 { |
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118 if (len > 1) |
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119 { |
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120 char *tmp_fmt = strsave (fmt); |
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121 tmp_fmt[len - 1] = '\0'; |
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122 verror (name, tmp_fmt, args); |
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123 delete [] tmp_fmt; |
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124 } |
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125 |
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126 error_state = -2; |
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127 } |
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128 else |
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129 verror (name, fmt, args); |
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130 } |
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131 } |
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132 else |
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133 panic ("error_1: invalid format"); |
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134 |
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135 if (! error_state) |
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136 error_state = 1; |
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137 } |
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138 } |
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139 |
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140 void |
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141 message (const char *name, const char *fmt, ...) |
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142 { |
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143 va_list args; |
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144 va_start (args, fmt); |
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145 verror (name, fmt, args); |
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146 va_end (args); |
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147 } |
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148 |
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149 void |
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150 usage (const char *fmt, ...) |
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151 { |
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152 va_list args; |
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153 va_start (args, fmt); |
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154 error_state = -1; |
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155 verror ("usage", fmt, args); |
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156 va_end (args); |
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157 } |
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158 |
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159 void |
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160 warning (const char *fmt, ...) |
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161 { |
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162 va_list args; |
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163 va_start (args, fmt); |
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164 verror ("warning", fmt, args); |
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165 va_end (args); |
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166 } |
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167 |
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168 void |
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169 error (const char *fmt, ...) |
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170 { |
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171 va_list args; |
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172 va_start (args, fmt); |
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173 error_1 ("error", fmt, args); |
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174 va_end (args); |
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175 } |
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176 |
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177 void |
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178 parse_error (const char *fmt, ...) |
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179 { |
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180 va_list args; |
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181 va_start (args, fmt); |
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182 error_1 (0, fmt, args); |
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183 va_end (args); |
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184 } |
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185 |
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189
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186 void |
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187 panic (const char *fmt, ...) |
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188 { |
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189 flush_output_to_pager (); |
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190 |
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191 va_list args; |
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192 va_start (args, fmt); |
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193 verror ("panic", fmt, args); |
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194 va_end (args); |
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195 abort (); |
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196 } |
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197 |
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198 typedef void (*error_fun)(const char *, ...); |
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199 |
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200 extern Octave_object Fsprintf (const Octave_object&, int); |
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201 |
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202 static Octave_object |
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203 handle_message (error_fun f, const char *msg, const Octave_object& args) |
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204 { |
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205 Octave_object retval; |
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206 |
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207 string tstr; |
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208 |
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209 int nargin = args.length (); |
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210 |
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211 tree_constant arg = ((nargin > 1) ? Fsprintf (args, 1) : args) (0); |
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212 |
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213 if (arg.is_defined ()) |
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214 { |
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215 if (arg.is_string ()) |
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216 { |
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217 tstr = arg.string_value (); |
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218 msg = tstr.c_str (); |
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219 |
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220 if (! msg) |
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221 return retval; |
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222 } |
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223 else if (arg.is_empty ()) |
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224 return retval; |
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225 } |
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226 |
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227 // Ugh. |
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228 |
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229 int len = strlen (msg); |
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230 if (msg[len - 1] == '\n') |
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231 { |
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232 if (len > 1) |
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233 { |
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234 char *tmp_msg = strsave (msg); |
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235 tmp_msg[len - 1] = '\0'; |
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236 f ("%s\n", tmp_msg); |
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237 delete [] tmp_msg; |
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238 } |
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239 } |
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240 else |
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241 f ("%s", msg); |
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242 |
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243 return retval; |
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244 } |
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245 |
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1957
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246 DEFUN (error, args, , |
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247 "error (FMT, ...): print message according to FMT and set error state.\n\ |
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248 \n\ |
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249 This should eventually take us up to the top level, possibly\n\ |
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250 printing traceback messages as we go.\n\ |
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251 \n\ |
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252 If MESSAGE ends in a newline character, traceback messages are not\n\ |
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253 printed.\n\ |
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254 \n\ |
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255 See also: printf") |
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897
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256 { |
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257 return handle_message (error, "unspecified error", args); |
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258 } |
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897
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259 |
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260 DEFUN (warning, args, , |
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261 "warning (FMT, ...): print a warning message according to FMT.\n\ |
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262 \n\ |
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263 See also: error, printf") |
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264 { |
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265 return handle_message (warning, "unspecified warning", args); |
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266 } |
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267 |
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1957
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268 DEFUN (usage, args, , |
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269 "usage (FMT, ...): print a usage message according to FMT.\n\ |
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270 \n\ |
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271 See also: error, printf") |
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272 { |
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273 return handle_message (usage, "unknown", args); |
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274 } |
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275 |
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276 /* |
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277 ;;; Local Variables: *** |
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278 ;;; mode: C++ *** |
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279 ;;; page-delimiter: "^/\\*" *** |
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280 ;;; End: *** |
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281 */ |
