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1
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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 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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1192
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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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1633
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28 #include <cstring> |
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1343
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29 |
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1728
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30 #include <string> |
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31 |
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4051
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32 #include "lo-sstream.h" |
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33 |
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1352
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34 #include "defun.h" |
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1
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35 #include "error.h" |
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3707
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36 #include "input.h" |
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1742
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37 #include "pager.h" |
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1352
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38 #include "oct-obj.h" |
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39 #include "utils.h" |
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2370
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40 #include "ov.h" |
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3707
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41 #include "ov-usr-fcn.h" |
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42 #include "pt-pr-code.h" |
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43 #include "pt-stmt.h" |
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44 #include "toplev.h" |
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45 #include "unwind-prot.h" |
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2370
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46 #include "variables.h" |
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47 |
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2174
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48 // TRUE means that Octave will try to beep obnoxiously before printing |
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49 // error messages. |
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50 static bool Vbeep_on_error; |
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51 |
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3707
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52 // TRUE means that Octave will try to enter the debugger when an error |
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53 // is encountered. This will also inhibit printing of the normal |
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54 // traceback message (you will only see the top-level error message). |
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55 static bool Vdebug_on_error; |
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56 |
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57 // TRUE means that Octave will try to enter the debugger when a warning |
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58 // is encountered. |
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59 static bool Vdebug_on_warning; |
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60 |
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3935
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61 // The text of the last error message. |
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62 static std::string Vlast_error_message; |
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63 |
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3934
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64 // The text of the last warning message. |
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65 static std::string Vlast_warning_message; |
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66 |
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67 // The warning frequency for Matlab handle graphics backwards |
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68 // compatibility warnings (currently not used). |
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69 static std::string Vwarning_frequency = "once"; |
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70 |
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71 // The current warning state. Valid values are "on", "off", |
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72 // "backtrace", or "debug". |
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3935
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73 std::string Vwarning_option = "backtrace"; |
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3934
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74 |
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143
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75 // Current error state. |
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3935
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76 // |
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77 // Valid values: |
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78 // |
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79 // -2: an error has occurred, but don't print any messages. |
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80 // -1: an error has occurred, we are printing a traceback |
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81 // 0: no error |
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82 // 1: an error has occurred |
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83 // |
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672
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84 int error_state = 0; |
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85 |
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3489
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86 // Current warning state. |
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3935
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87 // |
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88 // Valid values: |
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89 // |
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90 // 0: no warning |
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91 // 1: a warning has occurred |
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92 // |
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3489
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93 int warning_state = 0; |
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94 |
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1489
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95 // Tell the error handler whether to print messages, or just store |
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96 // them for later. Used for handling errors in eval() and |
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97 // the `unwind_protect' statement. |
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4699
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98 int buffer_error_messages = 0; |
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99 |
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3815
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100 // TRUE means error messages are turned off. |
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101 bool discard_error_messages = false; |
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102 |
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4452
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103 // TRUE means warning messages are turned off. |
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104 bool discard_warning_messages = false; |
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105 |
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3811
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106 // The message buffer. |
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107 static OSSTREAM *error_message_buffer = 0; |
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143
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108 |
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4318
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109 void |
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110 reset_error_handler (void) |
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111 { |
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112 error_state = 0; |
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113 warning_state = 0; |
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114 buffer_error_messages = 0; |
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4318
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115 discard_error_messages = false; |
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116 } |
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117 |
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3491
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118 // Warning messages are never buffered. |
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119 |
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120 static void |
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121 vwarning (const char *name, const char *fmt, va_list args) |
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122 { |
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4452
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123 if (discard_warning_messages) |
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124 return; |
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125 |
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3491
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126 flush_octave_stdout (); |
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127 |
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4051
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128 OSSTREAM output_buf; |
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3491
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129 |
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130 if (name) |
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3761
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131 output_buf << name << ": "; |
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132 |
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133 octave_vformat (output_buf, fmt, args); |
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134 |
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135 output_buf << std::endl << OSSTREAM_ENDS; |
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136 |
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3935
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137 // XXX FIXME XXX -- we really want to capture the message before it |
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138 // has all the formatting goop attached to it. We probably also |
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139 // want just the message, not the traceback information. |
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140 |
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4051
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141 std::string msg_string = OSSTREAM_STR (output_buf); |
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142 |
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4051
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143 OSSTREAM_FREEZE (output_buf); |
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3934
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144 |
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3935
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145 if (! warning_state) |
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146 { |
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147 // This is the first warning in a possible series. |
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148 Vlast_warning_message = msg_string; |
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149 } |
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3934
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150 |
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3935
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151 octave_diary << msg_string; |
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152 |
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153 std::cerr << msg_string; |
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3491
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154 } |
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155 |
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1
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156 static void |
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4732
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157 verror (bool save_last_error, std::ostream& os, |
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158 const char *name, const char *fmt, va_list args) |
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1
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159 { |
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3815
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160 if (discard_error_messages) |
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161 return; |
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162 |
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3585
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163 if (! buffer_error_messages) |
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164 flush_octave_stdout (); |
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914
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165 |
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2174
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166 bool to_beep_or_not_to_beep_p = Vbeep_on_error && ! error_state; |
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167 |
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4051
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168 OSSTREAM output_buf; |
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1
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169 |
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2174
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170 if (to_beep_or_not_to_beep_p) |
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1423
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171 output_buf << "\a"; |
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3620
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172 |
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599
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173 if (name) |
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174 output_buf << name << ": "; |
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3620
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175 |
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176 octave_vformat (output_buf, fmt, args); |
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177 |
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178 output_buf << std::endl << OSSTREAM_ENDS; |
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179 |
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3935
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180 // XXX FIXME XXX -- we really want to capture the message before it |
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181 // has all the formatting goop attached to it. We probably also |
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182 // want just the message, not the traceback information. |
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183 |
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4051
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184 std::string msg_string = OSSTREAM_STR (output_buf); |
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3935
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185 |
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4051
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186 OSSTREAM_FREEZE (output_buf); |
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3935
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187 |
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4731
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188 if (! error_state && save_last_error) |
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3935
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189 { |
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190 // This is the first error in a possible series. |
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191 Vlast_error_message = msg_string; |
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192 } |
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193 |
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1489
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194 if (buffer_error_messages) |
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195 { |
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3941
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196 std::string tmp = msg_string; |
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1489
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197 |
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198 if (! error_message_buffer) |
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199 { |
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200 error_message_buffer = new OSSTREAM; |
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201 |
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202 // XXX FIXME XXX -- this is ugly, but it prevents |
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203 // |
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204 // eval ("error (\"msg\")", "error (lasterr ())"); |
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205 // |
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206 // from printing `error: ' twice. Assumes that the NAME we |
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207 // have been given doesn't contain `:'. |
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208 |
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3935
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209 size_t pos = msg_string.find (':'); |
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3162
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210 |
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3935
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211 if (pos != NPOS && pos < Vlast_error_message.length () - 2) |
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212 tmp = msg_string.substr (pos+2); |
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1489
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213 } |
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214 |
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3935
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215 *error_message_buffer << tmp; |
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216 } |
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217 else |
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218 { |
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219 octave_diary << msg_string; |
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220 os << msg_string; |
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221 } |
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1
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222 } |
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223 |
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1266
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224 // Note that we don't actually print any message if the error string |
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225 // is just "" or "\n". This allows error ("") and error ("\n") to |
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226 // just set the error state. |
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227 |
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1005
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228 static void |
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229 error_1 (std::ostream& os, const char *name, const char *fmt, va_list args) |
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1005
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230 { |
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231 if (error_state != -2) |
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232 { |
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1489
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233 if (fmt) |
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1005
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234 { |
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1489
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235 if (*fmt) |
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1005
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236 { |
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1489
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237 int len = strlen (fmt); |
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238 if (fmt[len - 1] == '\n') |
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1266
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239 { |
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1489
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240 if (len > 1) |
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1266
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241 { |
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1489
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242 char *tmp_fmt = strsave (fmt); |
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243 tmp_fmt[len - 1] = '\0'; |
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244 verror (true, os, name, tmp_fmt, args); |
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1489
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245 delete [] tmp_fmt; |
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246 } |
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247 |
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1489
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248 error_state = -2; |
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1266
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249 } |
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1489
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250 else |
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4732
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251 verror (true, os, name, fmt, args); |
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1005
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252 } |
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253 } |
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1489
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254 else |
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255 panic ("error_1: invalid format"); |
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1423
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256 |
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257 if (! error_state) |
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258 error_state = 1; |
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1005
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259 } |
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260 } |
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261 |
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1
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262 void |
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263 message (const char *name, const char *fmt, ...) |
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264 { |
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265 va_list args; |
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266 va_start (args, fmt); |
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4732
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267 verror (false, std::cerr, name, fmt, args); |
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1
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268 va_end (args); |
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269 } |
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270 |
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271 void |
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272 usage (const char *fmt, ...) |
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273 { |
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274 va_list args; |
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275 va_start (args, fmt); |
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4732
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276 verror (true, std::cerr, "usage", fmt, args); |
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905
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277 error_state = -1; |
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1
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278 va_end (args); |
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279 } |
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280 |
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3707
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281 static void |
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3719
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282 pr_where_2 (const char *fmt, va_list args) |
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283 { |
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284 if (fmt) |
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285 { |
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286 if (*fmt) |
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287 { |
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288 int len = strlen (fmt); |
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289 if (fmt[len - 1] == '\n') |
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290 { |
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291 if (len > 1) |
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292 { |
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293 char *tmp_fmt = strsave (fmt); |
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294 tmp_fmt[len - 1] = '\0'; |
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4732
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295 verror (false, std::cerr, 0, tmp_fmt, args); |
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3719
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296 delete [] tmp_fmt; |
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297 } |
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298 } |
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299 else |
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4732
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300 verror (false, std::cerr, 0, fmt, args); |
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3719
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301 } |
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302 } |
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303 else |
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304 panic ("pr_where_2: invalid format"); |
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305 } |
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306 |
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307 static void |
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3707
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308 pr_where_1 (const char *fmt, ...) |
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309 { |
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310 va_list args; |
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311 va_start (args, fmt); |
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3719
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312 pr_where_2 (fmt, args); |
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3707
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313 va_end (args); |
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314 } |
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315 |
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316 static void |
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4719
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317 pr_where (const char *name, bool print_code = true) |
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3707
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318 { |
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319 if (curr_statement) |
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320 { |
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3708
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321 const char *f_nm = 0; |
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3707
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322 |
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3708
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323 if (curr_function) |
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324 { |
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4748
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325 std::string fcn_name = curr_function->name (); |
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3708
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326 std::string file_name = curr_function->fcn_file_name (); |
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327 |
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328 f_nm = file_name.empty () ? fcn_name.c_str () : file_name.c_str (); |
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329 } |
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3707
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330 |
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331 int l = curr_statement->line (); |
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332 int c = curr_statement->column (); |
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333 |
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3708
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334 if (f_nm) |
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335 pr_where_1 ("%s: in %s near line %d, column %d:", name, f_nm, l, c); |
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336 else |
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337 pr_where_1 ("%s: near line %d, column %d:", name, l, c); |
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3707
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338 |
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4719
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339 if (print_code) |
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340 { |
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341 // XXX FIXME XXX -- Note that the column number is probably |
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342 // not going to mean much here since the code is being |
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343 // reproduced from the parse tree, and we are only showing |
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344 // one statement even if there were multiple statements on |
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345 // the original source line. |
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3707
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346 |
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4719
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347 OSSTREAM output_buf; |
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3708
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348 |
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4719
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349 output_buf << std::endl; |
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3707
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350 |
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4719
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351 tree_print_code tpc (output_buf, ">>> "); |
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352 |
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353 curr_statement->accept (tpc); |
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3707
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354 |
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4719
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355 output_buf << std::endl << OSSTREAM_ENDS; |
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3707
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356 |
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4719
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357 pr_where_1 ("%s", OSSTREAM_C_STR (output_buf)); |
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3707
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358 |
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4719
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359 OSSTREAM_FREEZE (output_buf); |
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360 } |
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3707
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361 } |
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362 } |
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363 |
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1
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364 void |
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365 warning (const char *fmt, ...) |
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366 { |
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3934
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367 if (Vwarning_option != "off") |
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368 { |
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4014
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369 if (curr_sym_tab != top_level_sym_tab |
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370 && Vwarning_option == "backtrace" |
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4452
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371 && ! warning_state |
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372 && ! discard_warning_messages) |
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4719
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373 pr_where ("warning", false); |
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3986
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374 |
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3934
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375 va_list args; |
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376 va_start (args, fmt); |
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377 vwarning ("warning", fmt, args); |
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378 va_end (args); |
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3707
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379 |
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3935
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380 warning_state = 1; |
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381 |
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3934
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382 if ((interactive || forced_interactive) |
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383 && Vdebug_on_warning && curr_function) |
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384 { |
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385 unwind_protect_bool (Vdebug_on_warning); |
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386 Vdebug_on_warning = false; |
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3707
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387 |
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3934
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388 do_keyboard (octave_value_list ()); |
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3707
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389 |
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3934
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390 unwind_protect::run (); |
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391 } |
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3707
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392 } |
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1
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393 } |
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394 |
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395 void |
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396 error (const char *fmt, ...) |
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397 { |
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3707
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398 int init_state = error_state; |
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399 |
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1
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400 va_list args; |
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401 va_start (args, fmt); |
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4732
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402 error_1 (std::cerr, "error", fmt, args); |
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1005
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403 va_end (args); |
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3707
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404 |
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405 if ((interactive || forced_interactive) |
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406 && Vdebug_on_error && init_state == 0 && curr_function) |
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407 { |
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408 unwind_protect_bool (Vdebug_on_error); |
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409 Vdebug_on_error = false; |
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410 |
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3708
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411 pr_where ("error"); |
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3707
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412 |
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413 error_state = 0; |
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414 |
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415 do_keyboard (octave_value_list ()); |
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416 |
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417 unwind_protect::run (); |
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418 } |
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1005
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419 } |
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436
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420 |
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1005
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421 void |
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422 parse_error (const char *fmt, ...) |
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423 { |
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424 va_list args; |
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425 va_start (args, fmt); |
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4732
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426 error_1 (std::cerr, 0, fmt, args); |
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1
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427 va_end (args); |
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428 } |
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429 |
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189
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430 void |
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1
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431 panic (const char *fmt, ...) |
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432 { |
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433 va_list args; |
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434 va_start (args, fmt); |
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4699
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435 buffer_error_messages = 0; |
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3815
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436 discard_error_messages = false; |
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4732
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437 verror (false, std::cerr, "panic", fmt, args); |
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1
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438 va_end (args); |
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439 abort (); |
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440 } |
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441 |
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4732
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442 static void |
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443 defun_usage_message_1 (const char *fmt, ...) |
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444 { |
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445 va_list args; |
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446 va_start (args, fmt); |
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447 error_1 (octave_stdout, 0, fmt, args); |
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448 va_end (args); |
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449 } |
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450 |
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451 void |
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452 defun_usage_message (const std::string& msg) |
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453 { |
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454 defun_usage_message_1 ("%s", msg.c_str ()); |
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455 } |
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456 |
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1489
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457 typedef void (*error_fun)(const char *, ...); |
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458 |
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2086
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459 extern octave_value_list Fsprintf (const octave_value_list&, int); |
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1489
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460 |
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3934
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461 static std::string |
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2086
|
462 handle_message (error_fun f, const char *msg, const octave_value_list& args) |
|
528
|
463 { |
|
3934
|
464 std::string retval; |
|
528
|
465 |
|
3523
|
466 std::string tstr; |
|
1728
|
467 |
|
528
|
468 int nargin = args.length (); |
|
|
469 |
|
2745
|
470 if (nargin > 0) |
|
528
|
471 { |
|
3066
|
472 octave_value arg; |
|
|
473 |
|
|
474 if (nargin > 1) |
|
|
475 { |
|
|
476 octave_value_list tmp = Fsprintf (args, 1); |
|
|
477 arg = tmp(0); |
|
|
478 } |
|
|
479 else |
|
|
480 arg = args(0); |
|
2745
|
481 |
|
|
482 if (arg.is_defined ()) |
|
528
|
483 { |
|
2745
|
484 if (arg.is_string ()) |
|
|
485 { |
|
|
486 tstr = arg.string_value (); |
|
|
487 msg = tstr.c_str (); |
|
|
488 |
|
|
489 if (! msg) |
|
|
490 return retval; |
|
|
491 } |
|
|
492 else if (arg.is_empty ()) |
|
528
|
493 return retval; |
|
|
494 } |
|
|
495 } |
|
|
496 |
|
1489
|
497 // Ugh. |
|
|
498 |
|
|
499 int len = strlen (msg); |
|
|
500 if (msg[len - 1] == '\n') |
|
|
501 { |
|
|
502 if (len > 1) |
|
|
503 { |
|
|
504 char *tmp_msg = strsave (msg); |
|
|
505 tmp_msg[len - 1] = '\0'; |
|
|
506 f ("%s\n", tmp_msg); |
|
3934
|
507 retval = tmp_msg; |
|
1489
|
508 delete [] tmp_msg; |
|
|
509 } |
|
|
510 } |
|
|
511 else |
|
3934
|
512 { |
|
|
513 f ("%s", msg); |
|
|
514 retval = msg; |
|
|
515 } |
|
528
|
516 |
|
|
517 return retval; |
|
|
518 } |
|
|
519 |
|
1957
|
520 DEFUN (error, args, , |
|
3373
|
521 "-*- texinfo -*-\n\ |
|
|
522 @deftypefn {Built-in Function} {} error (@var{template}, @dots{})\n\ |
|
|
523 The @code{error} function formats the optional arguments under the\n\ |
|
|
524 control of the template string @var{template} using the same rules as\n\ |
|
|
525 the @code{printf} family of functions (@pxref{Formatted Output}).\n\ |
|
|
526 The resulting message is prefixed by the string @samp{error: } and\n\ |
|
|
527 printed on the @code{stderr} stream.\n\ |
|
|
528 \n\ |
|
|
529 Calling @code{error} also sets Octave's internal error state such that\n\ |
|
|
530 control will return to the top level without evaluating any more\n\ |
|
|
531 commands. This is useful for aborting from functions or scripts.\n\ |
|
897
|
532 \n\ |
|
3373
|
533 If the error message does not end with a new line character, Octave will\n\ |
|
|
534 print a traceback of all the function calls leading to the error. For\n\ |
|
|
535 example, given the following function definitions:\n\ |
|
|
536 \n\ |
|
|
537 @example\n\ |
|
|
538 @group\n\ |
|
|
539 function f () g () end\n\ |
|
|
540 function g () h () end\n\ |
|
|
541 function h () nargin == 1 || error (\"nargin != 1\"); end\n\ |
|
|
542 @end group\n\ |
|
|
543 @end example\n\ |
|
1489
|
544 \n\ |
|
3373
|
545 @noindent\n\ |
|
|
546 calling the function @code{f} will result in a list of messages that\n\ |
|
|
547 can help you to quickly locate the exact location of the error:\n\ |
|
1489
|
548 \n\ |
|
3373
|
549 @example\n\ |
|
|
550 @group\n\ |
|
|
551 f ()\n\ |
|
|
552 error: nargin != 1\n\ |
|
|
553 error: evaluating index expression near line 1, column 30\n\ |
|
|
554 error: evaluating binary operator `||' near line 1, column 27\n\ |
|
|
555 error: called from `h'\n\ |
|
|
556 error: called from `g'\n\ |
|
|
557 error: called from `f'\n\ |
|
|
558 @end group\n\ |
|
|
559 @end example\n\ |
|
|
560 \n\ |
|
|
561 If the error message ends in a new line character, Octave will print the\n\ |
|
|
562 message but will not display any traceback messages as it returns\n\ |
|
|
563 control to the top level. For example, modifying the error message\n\ |
|
|
564 in the previous example to end in a new line causes Octave to only print\n\ |
|
|
565 a single message:\n\ |
|
|
566 \n\ |
|
|
567 @example\n\ |
|
|
568 @group\n\ |
|
|
569 function h () nargin == 1 || error (\"nargin != 1\\n\"); end\n\ |
|
|
570 f ()\n\ |
|
|
571 error: nargin != 1\n\ |
|
|
572 @end group\n\ |
|
|
573 @end example\n\ |
|
|
574 @end deftypefn") |
|
897
|
575 { |
|
3934
|
576 octave_value_list retval; |
|
|
577 handle_message (error, "unspecified error", args); |
|
|
578 return retval; |
|
1489
|
579 } |
|
897
|
580 |
|
3934
|
581 static inline octave_value_list |
|
|
582 set_warning_option (const std::string& state, |
|
3935
|
583 const std::string& frequency, int nargout) |
|
3934
|
584 { |
|
|
585 octave_value_list retval; |
|
|
586 |
|
|
587 if (nargout > 1) |
|
|
588 retval(1) = Vwarning_frequency; |
|
|
589 |
|
3935
|
590 if (nargout >= 0) |
|
3934
|
591 retval(0) = Vwarning_option; |
|
|
592 |
|
|
593 if (! state.empty ()) |
|
|
594 Vwarning_option = state; |
|
|
595 |
|
|
596 if (! frequency.empty ()) |
|
|
597 Vwarning_frequency = frequency; |
|
|
598 |
|
|
599 return retval; |
|
|
600 } |
|
|
601 |
|
3935
|
602 DEFUN (warning, args, nargout, |
|
3373
|
603 "-*- texinfo -*-\n\ |
|
|
604 @deftypefn {Built-in Function} {} warning (@var{msg})\n\ |
|
|
605 Print a warning message @var{msg} prefixed by the string @samp{warning: }. \n\ |
|
|
606 After printing the warning message, Octave will continue to execute\n\ |
|
3600
|
607 commands. You should use this function when you want to notify the user\n\ |
|
|
608 of an unusual condition, but only when it makes sense for your program\n\ |
|
|
609 to go on.\n\ |
|
3373
|
610 @end deftypefn") |
|
1489
|
611 { |
|
3934
|
612 octave_value_list retval; |
|
|
613 |
|
|
614 int argc = args.length () + 1; |
|
|
615 |
|
3935
|
616 bool done = false; |
|
3934
|
617 |
|
3935
|
618 if (args.all_strings_p ()) |
|
|
619 { |
|
|
620 string_vector argv = args.make_argv ("warning"); |
|
|
621 |
|
|
622 if (! error_state) |
|
3934
|
623 { |
|
3935
|
624 if (argc == 1) |
|
3934
|
625 { |
|
|
626 retval = set_warning_option ("", "", nargout); |
|
|
627 done = true; |
|
|
628 } |
|
3935
|
629 else if (argc == 2) |
|
|
630 { |
|
|
631 std::string arg = argv(1); |
|
3934
|
632 |
|
3935
|
633 if (arg == "on" || arg == "off" || arg == "backtrace") |
|
|
634 { |
|
|
635 retval = set_warning_option (arg, "", nargout); |
|
|
636 done = true; |
|
|
637 } |
|
|
638 else if (arg == "once" || arg == "always") |
|
|
639 { |
|
|
640 retval = set_warning_option ("", arg, nargout); |
|
|
641 done = true; |
|
|
642 } |
|
|
643 else if (arg == "debug") |
|
|
644 { |
|
4324
|
645 bind_builtin_variable ("debug_on_warning", true); |
|
3935
|
646 retval = set_warning_option ("", "", nargout); |
|
|
647 done = true; |
|
|
648 } |
|
|
649 } |
|
3934
|
650 } |
|
|
651 } |
|
|
652 |
|
3935
|
653 if (! done) |
|
|
654 { |
|
|
655 std::string prev_msg = Vlast_warning_message; |
|
|
656 |
|
|
657 std::string curr_msg |
|
|
658 = handle_message (warning, "unspecified warning", args); |
|
|
659 |
|
|
660 if (nargout > 0) |
|
|
661 retval(0) = Vlast_warning_message; |
|
|
662 } |
|
|
663 |
|
3934
|
664 return retval; |
|
|
665 } |
|
|
666 |
|
3935
|
667 DEFUN (lasterr, args, , |
|
|
668 "-*- texinfo -*-\n\ |
|
|
669 @deftypefn {Built-in Function} {} lasterr ()\n\ |
|
|
670 @deftypefnx {Built-in Function} {} lasterr (@var{msg})\n\ |
|
|
671 Without any arguments, return the last error message. With one\n\ |
|
|
672 argument, set the last warning message to @var{msg}.\n\ |
|
|
673 @end deftypefn") |
|
|
674 { |
|
|
675 octave_value_list retval; |
|
|
676 |
|
|
677 int argc = args.length () + 1; |
|
|
678 |
|
|
679 string_vector argv = args.make_argv ("lasterr"); |
|
|
680 |
|
|
681 if (argc == 1) |
|
|
682 retval(0) = Vlast_error_message; |
|
|
683 else if (argc == 2) |
|
|
684 Vlast_error_message = argv(1); |
|
|
685 else |
|
|
686 print_usage ("lasterr"); |
|
|
687 |
|
|
688 return retval; |
|
|
689 } |
|
|
690 |
|
4699
|
691 // For backward compatibility. |
|
|
692 DEFALIAS (error_text, lasterr); |
|
|
693 DEFALIAS (__error_text__, lasterr); |
|
|
694 |
|
3934
|
695 DEFUN (lastwarn, args, , |
|
|
696 "-*- texinfo -*-\n\ |
|
|
697 @deftypefn {Built-in Function} {} lastwarn ()\n\ |
|
|
698 @deftypefnx {Built-in Function} {} lastwarn (@var{msg})\n\ |
|
3935
|
699 Without any arguments, return the last warning message. With one\n\ |
|
|
700 argument, set the last error message to @var{msg}.\n\ |
|
3934
|
701 @end deftypefn") |
|
|
702 { |
|
|
703 octave_value_list retval; |
|
|
704 |
|
|
705 int argc = args.length () + 1; |
|
|
706 |
|
|
707 string_vector argv = args.make_argv ("lastwarn"); |
|
|
708 |
|
|
709 if (argc == 1) |
|
|
710 retval(0) = Vlast_warning_message; |
|
|
711 else if (argc == 2) |
|
|
712 Vlast_warning_message = argv(1); |
|
|
713 else |
|
|
714 print_usage ("lastwarn"); |
|
|
715 |
|
|
716 return retval; |
|
897
|
717 } |
|
|
718 |
|
1957
|
719 DEFUN (usage, args, , |
|
3373
|
720 "-*- texinfo -*-\n\ |
|
|
721 @deftypefn {Built-in Function} {} usage (@var{msg})\n\ |
|
|
722 Print the message @var{msg}, prefixed by the string @samp{usage: }, and\n\ |
|
|
723 set Octave's internal error state such that control will return to the\n\ |
|
|
724 top level without evaluating any more commands. This is useful for\n\ |
|
|
725 aborting from functions.\n\ |
|
|
726 \n\ |
|
|
727 After @code{usage} is evaluated, Octave will print a traceback of all\n\ |
|
|
728 the function calls leading to the usage message.\n\ |
|
899
|
729 \n\ |
|
3373
|
730 You should use this function for reporting problems errors that result\n\ |
|
|
731 from an improper call to a function, such as calling a function with an\n\ |
|
|
732 incorrect number of arguments, or with arguments of the wrong type. For\n\ |
|
|
733 example, most functions distributed with Octave begin with code like\n\ |
|
|
734 this\n\ |
|
|
735 \n\ |
|
|
736 @example\n\ |
|
|
737 @group\n\ |
|
|
738 if (nargin != 2)\n\ |
|
|
739 usage (\"foo (a, b)\");\n\ |
|
|
740 endif\n\ |
|
|
741 @end group\n\ |
|
|
742 @end example\n\ |
|
|
743 \n\ |
|
|
744 @noindent\n\ |
|
|
745 to check for the proper number of arguments.\n\ |
|
|
746 @end deftypefn") |
|
899
|
747 { |
|
3934
|
748 octave_value_list retval; |
|
|
749 handle_message (usage, "unknown", args); |
|
|
750 return retval; |
|
899
|
751 } |
|
|
752 |
|
2174
|
753 static int |
|
|
754 beep_on_error (void) |
|
|
755 { |
|
|
756 Vbeep_on_error = check_preference ("beep_on_error"); |
|
|
757 |
|
|
758 return 0; |
|
|
759 } |
|
|
760 |
|
3707
|
761 static int |
|
|
762 debug_on_error (void) |
|
|
763 { |
|
|
764 Vdebug_on_error = check_preference ("debug_on_error"); |
|
|
765 |
|
|
766 return 0; |
|
|
767 } |
|
|
768 |
|
|
769 static int |
|
|
770 debug_on_warning (void) |
|
|
771 { |
|
|
772 Vdebug_on_warning = check_preference ("debug_on_warning"); |
|
|
773 |
|
|
774 return 0; |
|
|
775 } |
|
|
776 |
|
2174
|
777 void |
|
|
778 symbols_of_error (void) |
|
|
779 { |
|
4233
|
780 DEFVAR (beep_on_error, false, beep_on_error, |
|
3373
|
781 "-*- texinfo -*-\n\ |
|
|
782 @defvr {Built-in Variable} beep_on_error\n\ |
|
|
783 If the value of @code{beep_on_error} is nonzero, Octave will try\n\ |
|
|
784 to ring your terminal's bell before printing an error message. The\n\ |
|
|
785 default value is 0.\n\ |
|
|
786 @end defvr"); |
|
3018
|
787 |
|
4233
|
788 DEFVAR (debug_on_error, false, debug_on_error, |
|
3707
|
789 "-*- texinfo -*-\n\ |
|
|
790 @defvr {Built-in Variable} debug_on_error\n\ |
|
|
791 If the value of @code{debug_on_error} is nonzero, Octave will try\n\ |
|
|
792 to enter the debugger when an error is encountered. This will also\n\ |
|
|
793 inhibit printing of the normal traceback message (you will only see\n\ |
|
|
794 the top-level error message). The default value is 0.\n\ |
|
|
795 @end defvr"); |
|
|
796 |
|
4233
|
797 DEFVAR (debug_on_warning, false, debug_on_warning, |
|
3707
|
798 "-*- texinfo -*-\n\ |
|
|
799 @defvr {Built-in Variable} debug_on_warning\n\ |
|
|
800 If the value of @code{debug_on_warning} is nonzero, Octave will try\n\ |
|
|
801 to enter the debugger when a warning is encountered. The default\n\ |
|
|
802 value is 0.\n\ |
|
|
803 @end defvr"); |
|
2174
|
804 } |
|
|
805 |
|
1
|
806 /* |
|
|
807 ;;; Local Variables: *** |
|
|
808 ;;; mode: C++ *** |
|
|
809 ;;; End: *** |
|
|
810 */ |
