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1 // octave.cc -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1992, 1993 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, 675 Mass Ave, Cambridge, MA 02139, USA. |
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21 |
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22 */ |
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23 |
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24 // Born February 20, 1992. |
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25 |
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26 #ifdef __GNUG__ |
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27 #pragma implementation |
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28 #endif |
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29 |
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30 #include <sys/types.h> |
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31 #include <time.h> |
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32 #include <pwd.h> |
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33 #include <setjmp.h> |
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34 #include <stdlib.h> |
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35 #include <string.h> |
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36 #include <signal.h> |
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37 #include <assert.h> |
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38 #include <iostream.h> |
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39 #include <fstream.h> |
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40 #include <GetOpt.h> |
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41 |
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42 #include "sighandlers.h" |
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43 #include "variables.h" |
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44 #include "error.h" |
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45 #include "tree-const.h" |
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46 #include "symtab.h" |
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47 #include "utils.h" |
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48 #include "builtins.h" |
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49 #include "input.h" |
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50 #include "pager.h" |
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51 #include "lex.h" |
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52 #include "octave.h" |
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53 #include "parse.h" |
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54 #include "unwind-prot.h" |
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55 #include "octave-hist.h" |
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56 #include "version.h" |
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57 #include "file-io.h" |
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58 #include "sysdep.h" |
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59 |
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60 // Signal handler return type. |
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61 #ifndef RETSIGTYPE |
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62 #define RETSIGTYPE void |
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63 #endif |
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64 #if 0 |
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65 #ifndef BADSIG |
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66 #define BADSIG (RETSIGTYPE (*)())-1 |
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67 #endif |
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68 #endif |
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69 |
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70 #ifdef sun |
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71 extern "C" { int on_exit (); } |
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72 #define atexit on_exit |
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73 #endif |
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74 |
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75 // argv[0] for this program. |
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76 char *raw_prog_name = (char *) NULL; |
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77 |
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78 // Cleaned-up name of this program, not including path information. |
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79 char *prog_name = (char *) NULL; |
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80 |
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81 // Login name for user running this program. |
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82 char *user_name = (char *) NULL; |
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83 |
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84 // Name of the host we are running on. |
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85 char *host_name = (char *) NULL; |
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86 |
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87 // User's home directory. |
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88 char *home_directory = (char *) NULL; |
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89 |
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90 // Guess what? |
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91 char *the_current_working_directory = (char *) NULL; |
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92 |
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93 // Load path specified on command line. |
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94 char *load_path = (char *) NULL; |
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95 |
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96 // If nonzero, don't do fancy line editing. |
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97 int no_line_editing = 0; |
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98 |
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99 // Command number, counting from the beginning of this session. |
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100 int current_command_number = 1; |
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101 |
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102 // Nonzero means we are exiting via the builtin exit or quit functions. |
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103 int quitting_gracefully = 0; |
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104 |
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105 // Current command to execute. |
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106 tree *global_command = (tree *) NULL; |
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107 |
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108 // Top level context (?) |
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109 jmp_buf toplevel; |
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110 |
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111 // Nonzero means we read ~/.octaverc and ./.octaverc. |
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112 static int read_init_files = 1; |
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113 |
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114 // Nonzero means we don\'t print the usual startup message. |
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115 static int inhibit_startup_message = 0; |
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116 |
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117 // Usage message |
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118 static const char *usage_string = "octave [-?dfhiqvx] [-p path] [file]"; |
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119 |
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120 // This is here so that it\'s more likely that the usage message and |
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121 // the real set of options will agree. |
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122 static const char *getopt_option_string = "?dfhip:qvx"; |
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123 |
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124 /* |
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125 * Initialize some global variables for later use. |
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126 */ |
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127 static void |
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128 initialize_globals (char *name) |
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129 { |
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130 struct passwd *entry = getpwuid (getuid ()); |
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131 if (entry) |
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132 user_name = strsave (entry->pw_name); |
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133 else |
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134 user_name = strsave ("I have no name!"); |
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135 endpwent (); |
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136 |
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137 char hostname[256]; |
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138 if (gethostname (hostname, 255) < 0) |
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139 host_name = strsave ("I have no host!"); |
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140 else |
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141 host_name = strsave (hostname); |
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142 |
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143 char *hd = getenv ("HOME"); |
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144 if (hd == (char *) NULL) |
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145 home_directory = strsave ("I have no home~!"); |
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146 else |
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147 home_directory = strsave (hd); |
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148 |
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149 raw_prog_name = strsave (name); |
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150 prog_name = strsave ("octave"); |
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151 |
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152 load_path = default_path (); |
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153 } |
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154 |
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155 void |
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156 parse_and_execute (FILE *f, int print) |
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157 { |
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158 begin_unwind_frame ("parse_and_execute"); |
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159 |
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160 YY_BUFFER_STATE old_buf = current_buffer (); |
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161 YY_BUFFER_STATE new_buf = create_buffer (f); |
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162 |
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163 add_unwind_protect (restore_input_buffer, (void *) old_buf); |
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164 add_unwind_protect (delete_input_buffer, (void *) new_buf); |
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165 |
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166 switch_to_buffer (new_buf); |
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167 |
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168 unwind_protect_int (echo_input); |
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169 unwind_protect_int (using_readline); |
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170 unwind_protect_int (saving_history); |
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171 |
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172 echo_input = 0; |
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173 using_readline = 0; |
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174 saving_history = 0; |
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175 |
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176 unwind_protect_ptr (curr_sym_tab); |
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177 |
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178 int retval; |
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179 do |
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180 { |
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181 retval = yyparse (); |
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182 if (retval == 0 && global_command != NULL_TREE) |
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183 { |
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184 global_command->eval (print); |
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185 delete global_command; |
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186 } |
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187 } |
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188 while (retval == 0); |
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189 |
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190 run_unwind_frame ("parse_and_execute"); |
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191 } |
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192 |
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193 void |
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194 parse_and_execute (char *s, int print) |
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195 { |
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196 begin_unwind_frame ("parse_and_execute_2"); |
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197 |
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198 unwind_protect_int (reading_script_file); |
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199 |
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200 reading_script_file = 1; |
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201 |
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202 FILE *f = get_input_from_file (s, 0); |
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203 if (f != (FILE *) NULL) |
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204 { |
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205 unwind_protect_int (input_line_number); |
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206 unwind_protect_int (current_input_column); |
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207 unwind_protect_int (echo_input); |
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208 |
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209 input_line_number = 0; |
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210 current_input_column = 0; |
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211 echo_input = 0; |
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212 |
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213 parse_and_execute (f, print); |
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214 } |
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215 |
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216 run_unwind_frame ("parse_and_execute_2"); |
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217 } |
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218 |
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219 /* |
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220 * Initialize by reading startup files. |
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221 */ |
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222 static void |
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223 execute_startup_files (void) |
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224 { |
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225 // Execute commands from the site-wide configuration file. |
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226 |
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227 char *sd = get_site_defaults (); |
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228 |
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229 parse_and_execute (sd, 0); |
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230 |
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231 // Try to execute commands from $HOME/.octaverc and ./.octaverc. |
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232 |
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233 if (home_directory != NULL) |
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234 { |
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235 char *rc = strconcat (home_directory, "/.octaverc"); |
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236 |
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237 parse_and_execute (rc, 0); |
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238 |
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239 delete [] rc; |
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240 } |
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241 |
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242 if (strcmp (the_current_working_directory, home_directory) != 0) |
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243 parse_and_execute ("./.octaverc", 0); |
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244 } |
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245 |
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246 /* |
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247 * Usage message with extra help. |
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248 */ |
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249 static void |
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250 verbose_usage (void) |
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251 { |
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252 cout << "\n" |
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253 << " Octave, version " << version_string |
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254 << ". Copyright (C) 1992, 1993, John W. Eaton.\n" |
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255 << " This is free software with ABSOLUTELY NO WARRANTY.\n" |
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256 << "\n" |
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257 << " " << usage_string |
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258 << "\n" |
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259 << " d : enter parser debugging mode\n" |
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260 << " f : don't read ~/.octaverc or .octaverc at startup\n" |
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261 << " h|? : print short help message and exit\n" |
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262 << " i : force interactive behavior\n" |
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263 << " q : don't print message at startup\n" |
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264 << " x : echo commands as they are executed\n" |
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265 << "\n" |
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266 << " file : execute commands from named file\n" |
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267 << "\n"; |
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268 |
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269 exit (1); |
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270 } |
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271 |
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272 /* |
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273 * Terse usage messsage. |
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274 */ |
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275 static void |
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276 usage (void) |
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277 { |
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278 usage (usage_string); |
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279 exit (1); |
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280 } |
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281 |
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282 /* |
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283 * Fix up things before exiting. |
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284 */ |
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285 volatile void |
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286 clean_up_and_exit (int retval) |
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287 { |
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288 raw_mode (0); |
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289 clean_up_history (); |
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290 close_plot_stream (); |
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291 close_files (); |
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292 |
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293 if (!quitting_gracefully && (interactive || forced_interactive)) |
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294 cout << "\n"; |
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295 |
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296 if (retval == EOF) |
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297 retval = 0; |
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298 |
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299 exit (retval); |
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300 } |
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301 |
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302 static void |
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303 print_version_and_exit (void) |
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304 { |
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305 cout << "octave, version " << version_string << "\n"; |
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306 exit (0); |
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307 } |
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308 |
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309 /* |
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310 * You guessed it. |
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311 */ |
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312 int |
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313 main (int argc, char **argv) |
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314 { |
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315 // Allow for system dependent initialization. See sysdep.cc for more |
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316 // details. |
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317 sysdep_init (); |
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318 |
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319 // Do this first, since some command line arguments may override the |
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320 // defaults. |
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321 initialize_globals (argv[0]); |
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322 |
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323 // If the |
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324 GetOpt getopt (argc, argv, getopt_option_string); |
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325 int option_char; |
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326 |
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327 while ((option_char = getopt ()) != EOF) |
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328 { |
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329 switch (option_char) |
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330 { |
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331 case 'd': |
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332 yydebug++; |
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333 break; |
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334 case 'f': |
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335 read_init_files = 0; |
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336 break; |
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337 case 'h': |
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338 case '?': |
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339 verbose_usage (); |
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340 break; |
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341 case 'i': |
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342 forced_interactive = 1; |
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343 break; |
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344 case 'p': |
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345 if (getopt.optarg != (char *) NULL) |
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346 load_path = strsave (getopt.optarg); |
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347 break; |
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348 case 'q': |
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349 inhibit_startup_message = 1; |
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350 break; |
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351 case 'x': |
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352 echo_input = 1; |
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353 break; |
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354 case 'v': |
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355 print_version_and_exit (); |
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356 break; |
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357 default: |
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358 usage (); |
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359 break; |
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360 } |
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361 } |
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362 |
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363 if (! inhibit_startup_message) |
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364 { |
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365 cout << "Octave, version " << version_string |
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366 << ". Copyright (C) 1992, 1993, John W. Eaton.\n" |
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367 << "This is free software with ABSOLUTELY NO WARRANTY.\n" |
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368 << "For details, type `warranty'.\n" |
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369 << "\n"; |
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370 } |
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371 |
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372 // Make sure we clean up when we exit. |
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373 atexit (cleanup_tmp_files); |
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374 |
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375 initialize_history (); |
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376 |
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377 initialize_file_io (); |
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378 |
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379 global_sym_tab = new symbol_table (); |
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380 curr_sym_tab = global_sym_tab; |
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381 |
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382 install_builtins (); |
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383 |
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384 top_level_sym_tab = new symbol_table (); |
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385 curr_sym_tab = top_level_sym_tab; |
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386 |
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387 if (read_init_files) |
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388 { |
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389 saving_history = 0; |
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390 execute_startup_files (); |
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391 saving_history = 1; |
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392 } |
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393 |
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394 initialize_readline (); |
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395 |
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396 initialize_pager (); |
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397 |
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398 // Avoid counting commands executed from startup files. |
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399 current_command_number = 1; |
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400 |
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401 // If there is an extra argument, see if it names a file to read. |
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402 |
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403 if (getopt.optind != argc) |
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404 { |
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405 FILE *infile = get_input_from_file (argv[getopt.optind]); |
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406 if (infile == (FILE *) NULL) |
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407 clean_up_and_exit (1); |
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408 else |
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409 switch_to_buffer (create_buffer (infile)); |
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410 } |
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411 else |
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412 { |
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413 // Is input coming from a terminal? If so, we are probably |
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414 // interactive. |
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415 |
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416 switch_to_buffer (create_buffer (get_input_from_stdin ())); |
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417 |
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418 interactive = (isatty (fileno (stdin)) && isatty (fileno (stdout))); |
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419 } |
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420 |
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421 // Force input to be echoed if not really interactive, but the user |
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422 // has forced interactive behavior. |
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423 |
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424 if (!interactive && forced_interactive) |
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425 echo_input = 1; |
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426 |
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427 if (! (interactive || forced_interactive)) |
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428 using_readline = 0; |
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429 |
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430 install_signal_handlers (); |
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431 |
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432 // Allow the user to interrupt us without exiting. |
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433 |
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434 volatile sig_handler *saved_sigint_handler = signal (SIGINT, SIG_IGN); |
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435 |
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436 if (setjmp (toplevel) != 0) |
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437 { |
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438 raw_mode (0); |
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439 cout << "\n"; |
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440 } |
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441 |
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442 can_interrupt = 1; |
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443 |
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444 signal (SIGINT, saved_sigint_handler); |
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445 |
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446 // The big loop. |
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447 |
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448 int retval; |
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449 do |
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450 { |
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451 reset_parser (); |
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452 retval = yyparse (); |
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453 if (retval == 0 && global_command != NULL_TREE) |
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454 { |
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455 global_command->eval (1); |
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456 delete global_command; |
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457 current_command_number++; |
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458 } |
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459 } |
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460 while (retval == 0); |
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461 |
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462 clean_up_and_exit (retval); |
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463 } |
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464 |
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465 /* |
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466 ;;; Local Variables: *** |
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467 ;;; mode: C++ *** |
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468 ;;; page-delimiter: "^/\\*" *** |
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469 ;;; End: *** |
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470 */ |
