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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) 1992, 1993, 1994, 1995 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 |
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30 #include <strstream.h> |
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31 |
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32 #include "defun.h" |
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33 #include "error.h" |
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34 #include "oct-obj.h" |
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35 #include "pager.h" |
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36 #include "tree-const.h" |
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37 #include "user-prefs.h" |
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38 #include "utils.h" |
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39 |
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143
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40 // Current error state. |
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41 int error_state = 0; |
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42 |
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43 // Tell the error handler whether to print messages, or just store |
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44 // them for later. Used for handling errors in eval() and |
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45 // the `unwind_protect' statement. |
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46 int buffer_error_messages; |
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47 |
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48 // The message buffer |
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49 ostrstream *error_message_buffer = 0; |
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50 |
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51 static void |
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52 verror (const char *name, const char *fmt, va_list args) |
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53 { |
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54 flush_output_to_pager (); |
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55 |
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56 int to_beep_or_not_to_beep = user_pref.beep_on_error && ! error_state; |
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57 |
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58 ostrstream output_buf; |
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59 |
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60 if (to_beep_or_not_to_beep) |
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61 output_buf << "\a"; |
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62 if (name) |
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63 output_buf << name << ": "; |
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64 output_buf.vform (fmt, args); |
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65 output_buf << endl << ends; |
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66 |
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67 char *msg = output_buf.str (); |
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68 |
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69 if (buffer_error_messages) |
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70 { |
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71 char *ptr = msg; |
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72 |
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73 if (! error_message_buffer) |
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74 { |
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75 error_message_buffer = new ostrstream; |
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76 |
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77 // XXX FIXME XXX -- this is ugly, but it prevents |
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78 // |
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79 // eval ("error (\"msg\")", "error (__error_text__)"); |
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80 // |
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81 // from printing `error: ' twice. Assumes that the NAME we |
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82 // have been given doesn't contain `:'. |
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83 |
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84 ptr = strchr (msg, ':') + 2; |
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85 ptr = ptr ? ptr : msg; |
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86 } |
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87 |
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88 *error_message_buffer << ptr; |
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89 } |
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90 else |
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91 { |
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92 maybe_write_to_diary_file (msg); |
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93 cerr << msg; |
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94 } |
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95 |
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96 delete [] msg; |
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97 } |
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98 |
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99 // Note that we don't actually print any message if the error string |
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100 // is just "" or "\n". This allows error ("") and error ("\n") to |
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101 // just set the error state. |
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102 |
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103 static void |
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104 error_1 (const char *name, const char *fmt, va_list args) |
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105 { |
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106 if (error_state != -2) |
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107 { |
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108 if (fmt) |
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109 { |
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110 if (*fmt) |
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111 { |
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112 int len = strlen (fmt); |
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113 if (fmt[len - 1] == '\n') |
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114 { |
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115 if (len > 1) |
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116 { |
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117 char *tmp_fmt = strsave (fmt); |
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118 tmp_fmt[len - 1] = '\0'; |
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119 verror (name, tmp_fmt, args); |
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120 delete [] tmp_fmt; |
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121 } |
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122 |
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123 error_state = -2; |
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124 } |
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125 else |
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126 verror (name, fmt, args); |
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127 } |
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128 } |
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129 else |
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130 panic ("error_1: invalid format"); |
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131 |
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132 if (! error_state) |
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133 error_state = 1; |
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134 } |
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135 } |
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136 |
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137 void |
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138 message (const char *name, const char *fmt, ...) |
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139 { |
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140 va_list args; |
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141 va_start (args, fmt); |
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142 verror (name, fmt, args); |
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143 va_end (args); |
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144 } |
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145 |
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146 void |
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147 usage (const char *fmt, ...) |
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148 { |
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149 va_list args; |
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150 va_start (args, fmt); |
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151 error_state = -1; |
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152 verror ("usage", fmt, args); |
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153 va_end (args); |
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154 } |
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155 |
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156 void |
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157 warning (const char *fmt, ...) |
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158 { |
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159 va_list args; |
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160 va_start (args, fmt); |
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161 verror ("warning", fmt, args); |
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162 va_end (args); |
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163 } |
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164 |
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165 void |
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166 error (const char *fmt, ...) |
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167 { |
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168 va_list args; |
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169 va_start (args, fmt); |
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170 error_1 ("error", fmt, args); |
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171 va_end (args); |
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172 } |
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173 |
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174 void |
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175 parse_error (const char *fmt, ...) |
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176 { |
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177 va_list args; |
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178 va_start (args, fmt); |
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179 error_1 (0, fmt, args); |
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180 va_end (args); |
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181 } |
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182 |
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189
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183 void |
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184 panic (const char *fmt, ...) |
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185 { |
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186 flush_output_to_pager (); |
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187 |
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188 va_list args; |
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189 va_start (args, fmt); |
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190 verror ("panic", fmt, args); |
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191 va_end (args); |
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192 abort (); |
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193 } |
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194 |
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195 typedef void (*error_fun)(const char *, ...); |
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196 |
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197 extern Octave_object Fsprintf (const Octave_object&, int); |
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198 |
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199 static Octave_object |
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200 handle_message (error_fun f, const char *msg, const Octave_object& args) |
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201 { |
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202 Octave_object retval; |
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203 |
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204 int nargin = args.length (); |
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205 |
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206 tree_constant arg = ((nargin > 1) ? Fsprintf (args, 1) : args) (0); |
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207 |
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208 if (arg.is_defined ()) |
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209 { |
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210 if (arg.is_string ()) |
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211 { |
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212 msg = arg.string_value (); |
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213 |
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214 if (! msg) |
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215 return retval; |
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216 } |
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217 else if (arg.is_empty ()) |
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218 return retval; |
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219 } |
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220 |
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221 // Ugh. |
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222 |
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223 int len = strlen (msg); |
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224 if (msg[len - 1] == '\n') |
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225 { |
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226 if (len > 1) |
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227 { |
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228 char *tmp_msg = strsave (msg); |
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229 tmp_msg[len - 1] = '\0'; |
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230 f ("%s\n", tmp_msg); |
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231 delete [] tmp_msg; |
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232 } |
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233 } |
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234 else |
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235 f ("%s", msg); |
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236 |
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237 return retval; |
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238 } |
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239 |
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240 DEFUN ("error", Ferror, Serror, 10, |
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241 "error (FMT, ...): print message according to FMT and set error state.\n\ |
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242 \n\ |
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243 This should eventually take us up to the top level, possibly\n\ |
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244 printing traceback messages as we go.\n\ |
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245 \n\ |
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246 If MESSAGE ends in a newline character, traceback messages are not\n\ |
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247 printed.\n\ |
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248 \n\ |
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249 See also: printf") |
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250 { |
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251 return handle_message (error, "unspecified error", args); |
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252 } |
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253 |
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254 DEFUN ("warning", Fwarning, Swarning, 10, |
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255 "warning (FMT, ...): print a warning message according to FMT.\n\ |
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256 \n\ |
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257 See also: error, printf") |
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258 { |
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259 return handle_message (warning, "unspecified warning", args); |
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260 } |
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261 |
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262 DEFUN ("usage", Fusage, Susage, 10, |
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263 "usage (FMT, ...): print a usage 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 (usage, "unknown", args); |
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268 } |
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269 |
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270 /* |
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271 ;;; Local Variables: *** |
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272 ;;; mode: C++ *** |
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273 ;;; page-delimiter: "^/\\*" *** |
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274 ;;; End: *** |
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275 */ |
