[25] | 1 | /* |
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| 2 | * tclMain.c -- |
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| 3 | * |
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| 4 | * Main program for Tcl shells and other Tcl-based applications. |
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| 5 | * |
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| 6 | * Copyright (c) 1988-1994 The Regents of the University of California. |
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| 7 | * Copyright (c) 1994-1997 Sun Microsystems, Inc. |
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| 8 | * Copyright (c) 2000 Ajuba Solutions. |
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| 9 | * |
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| 10 | * See the file "license.terms" for information on usage and redistribution of |
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| 11 | * this file, and for a DISCLAIMER OF ALL WARRANTIES. |
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| 12 | * |
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| 13 | * RCS: @(#) $Id: tclMain.c,v 1.44 2007/12/13 15:23:19 dgp Exp $ |
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| 14 | */ |
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| 15 | |
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| 16 | #include "tclInt.h" |
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| 17 | |
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| 18 | #undef TCL_STORAGE_CLASS |
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| 19 | #define TCL_STORAGE_CLASS DLLEXPORT |
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| 20 | |
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| 21 | /* |
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| 22 | * The default prompt used when the user has not overridden it. |
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| 23 | */ |
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| 24 | |
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| 25 | #define DEFAULT_PRIMARY_PROMPT "% " |
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| 26 | |
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| 27 | /* |
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| 28 | * Declarations for various library functions and variables (don't want to |
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| 29 | * include tclPort.h here, because people might copy this file out of the Tcl |
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| 30 | * source directory to make their own modified versions). |
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| 31 | */ |
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| 32 | |
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| 33 | extern CRTIMPORT int isatty(int fd); |
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| 34 | |
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| 35 | static Tcl_Obj *tclStartupScriptPath = NULL; |
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| 36 | static Tcl_Obj *tclStartupScriptEncoding = NULL; |
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| 37 | static Tcl_MainLoopProc *mainLoopProc = NULL; |
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| 38 | |
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| 39 | /* |
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| 40 | * Structure definition for information used to keep the state of an |
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| 41 | * interactive command processor that reads lines from standard input and |
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| 42 | * writes prompts and results to standard output. |
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| 43 | */ |
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| 44 | |
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| 45 | typedef enum { |
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| 46 | PROMPT_NONE, /* Print no prompt */ |
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| 47 | PROMPT_START, /* Print prompt for command start */ |
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| 48 | PROMPT_CONTINUE /* Print prompt for command continuation */ |
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| 49 | } PromptType; |
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| 50 | |
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| 51 | typedef struct InteractiveState { |
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| 52 | Tcl_Channel input; /* The standard input channel from which lines |
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| 53 | * are read. */ |
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| 54 | int tty; /* Non-zero means standard input is a |
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| 55 | * terminal-like device. Zero means it's a |
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| 56 | * file. */ |
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| 57 | Tcl_Obj *commandPtr; /* Used to assemble lines of input into Tcl |
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| 58 | * commands. */ |
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| 59 | PromptType prompt; /* Next prompt to print */ |
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| 60 | Tcl_Interp *interp; /* Interpreter that evaluates interactive |
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| 61 | * commands. */ |
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| 62 | } InteractiveState; |
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| 63 | |
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| 64 | /* |
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| 65 | * Forward declarations for functions defined later in this file. |
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| 66 | */ |
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| 67 | |
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| 68 | static void Prompt(Tcl_Interp *interp, PromptType *promptPtr); |
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| 69 | static void StdinProc(ClientData clientData, int mask); |
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| 70 | |
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| 71 | /* |
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| 72 | *---------------------------------------------------------------------- |
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| 73 | * |
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| 74 | * Tcl_SetStartupScript -- |
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| 75 | * |
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| 76 | * Sets the path and encoding of the startup script to be evaluated by |
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| 77 | * Tcl_Main, used to override the command line processing. |
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| 78 | * |
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| 79 | * Results: |
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| 80 | * None. |
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| 81 | * |
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| 82 | * Side effects: |
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| 83 | * |
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| 84 | *---------------------------------------------------------------------- |
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| 85 | */ |
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| 86 | |
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| 87 | void |
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| 88 | Tcl_SetStartupScript( |
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| 89 | Tcl_Obj *path, /* Filesystem path of startup script file */ |
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| 90 | CONST char *encoding) /* Encoding of the data in that file */ |
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| 91 | { |
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| 92 | Tcl_Obj *newEncoding = NULL; |
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| 93 | if (encoding != NULL) { |
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| 94 | newEncoding = Tcl_NewStringObj(encoding, -1); |
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| 95 | } |
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| 96 | |
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| 97 | if (tclStartupScriptPath != NULL) { |
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| 98 | Tcl_DecrRefCount(tclStartupScriptPath); |
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| 99 | } |
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| 100 | tclStartupScriptPath = path; |
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| 101 | if (tclStartupScriptPath != NULL) { |
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| 102 | Tcl_IncrRefCount(tclStartupScriptPath); |
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| 103 | } |
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| 104 | |
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| 105 | if (tclStartupScriptEncoding != NULL) { |
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| 106 | Tcl_DecrRefCount(tclStartupScriptEncoding); |
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| 107 | } |
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| 108 | tclStartupScriptEncoding = newEncoding; |
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| 109 | if (tclStartupScriptEncoding != NULL) { |
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| 110 | Tcl_IncrRefCount(tclStartupScriptEncoding); |
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| 111 | } |
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| 112 | } |
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| 113 | |
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| 114 | /* |
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| 115 | *---------------------------------------------------------------------- |
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| 116 | * |
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| 117 | * Tcl_GetStartupScript -- |
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| 118 | * |
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| 119 | * Gets the path and encoding of the startup script to be evaluated by |
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| 120 | * Tcl_Main. |
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| 121 | * |
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| 122 | * Results: |
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| 123 | * The path of the startup script; NULL if none has been set. |
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| 124 | * |
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| 125 | * Side effects: |
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| 126 | * If encodingPtr is not NULL, stores a (CONST char *) in it pointing to |
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| 127 | * the encoding name registered for the startup script. Tcl retains |
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| 128 | * ownership of the string, and may free it. Caller should make a copy |
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| 129 | * for long-term use. |
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| 130 | * |
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| 131 | *---------------------------------------------------------------------- |
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| 132 | */ |
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| 133 | |
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| 134 | Tcl_Obj * |
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| 135 | Tcl_GetStartupScript( |
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| 136 | CONST char **encodingPtr) /* When not NULL, points to storage for the |
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| 137 | * (CONST char *) that points to the |
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| 138 | * registered encoding name for the startup |
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| 139 | * script */ |
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| 140 | { |
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| 141 | if (encodingPtr != NULL) { |
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| 142 | if (tclStartupScriptEncoding == NULL) { |
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| 143 | *encodingPtr = NULL; |
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| 144 | } else { |
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| 145 | *encodingPtr = Tcl_GetString(tclStartupScriptEncoding); |
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| 146 | } |
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| 147 | } |
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| 148 | return tclStartupScriptPath; |
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| 149 | } |
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| 150 | |
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| 151 | /* |
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| 152 | *---------------------------------------------------------------------- |
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| 153 | * |
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| 154 | * TclSetStartupScriptPath -- |
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| 155 | * |
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| 156 | * Primes the startup script VFS path, used to override the command line |
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| 157 | * processing. |
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| 158 | * |
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| 159 | * Results: |
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| 160 | * None. |
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| 161 | * |
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| 162 | * Side effects: |
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| 163 | * This function initializes the VFS path of the Tcl script to run at |
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| 164 | * startup. |
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| 165 | * |
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| 166 | *---------------------------------------------------------------------- |
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| 167 | */ |
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| 168 | |
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| 169 | void |
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| 170 | TclSetStartupScriptPath( |
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| 171 | Tcl_Obj *path) |
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| 172 | { |
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| 173 | Tcl_SetStartupScript(path, NULL); |
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| 174 | } |
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| 175 | |
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| 176 | /* |
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| 177 | *---------------------------------------------------------------------- |
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| 178 | * |
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| 179 | * TclGetStartupScriptPath -- |
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| 180 | * |
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| 181 | * Gets the startup script VFS path, used to override the command line |
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| 182 | * processing. |
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| 183 | * |
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| 184 | * Results: |
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| 185 | * The startup script VFS path, NULL if none has been set. |
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| 186 | * |
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| 187 | * Side effects: |
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| 188 | * None. |
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| 189 | * |
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| 190 | *---------------------------------------------------------------------- |
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| 191 | */ |
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| 192 | |
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| 193 | Tcl_Obj * |
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| 194 | TclGetStartupScriptPath(void) |
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| 195 | { |
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| 196 | return Tcl_GetStartupScript(NULL); |
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| 197 | } |
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| 198 | |
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| 199 | /* |
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| 200 | *---------------------------------------------------------------------- |
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| 201 | * |
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| 202 | * TclSetStartupScriptFileName -- |
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| 203 | * |
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| 204 | * Primes the startup script file name, used to override the command line |
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| 205 | * processing. |
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| 206 | * |
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| 207 | * Results: |
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| 208 | * None. |
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| 209 | * |
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| 210 | * Side effects: |
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| 211 | * This function initializes the file name of the Tcl script to run at |
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| 212 | * startup. |
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| 213 | * |
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| 214 | *---------------------------------------------------------------------- |
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| 215 | */ |
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| 216 | |
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| 217 | void |
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| 218 | TclSetStartupScriptFileName( |
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| 219 | CONST char *fileName) |
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| 220 | { |
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| 221 | Tcl_Obj *path = Tcl_NewStringObj(fileName,-1); |
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| 222 | Tcl_SetStartupScript(path, NULL); |
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| 223 | } |
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| 224 | |
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| 225 | /* |
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| 226 | *---------------------------------------------------------------------- |
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| 227 | * |
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| 228 | * TclGetStartupScriptFileName -- |
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| 229 | * |
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| 230 | * Gets the startup script file name, used to override the command line |
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| 231 | * processing. |
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| 232 | * |
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| 233 | * Results: |
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| 234 | * The startup script file name, NULL if none has been set. |
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| 235 | * |
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| 236 | * Side effects: |
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| 237 | * None. |
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| 238 | * |
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| 239 | *---------------------------------------------------------------------- |
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| 240 | */ |
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| 241 | |
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| 242 | CONST char * |
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| 243 | TclGetStartupScriptFileName(void) |
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| 244 | { |
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| 245 | Tcl_Obj *path = Tcl_GetStartupScript(NULL); |
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| 246 | |
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| 247 | if (path == NULL) { |
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| 248 | return NULL; |
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| 249 | } |
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| 250 | return Tcl_GetString(path); |
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| 251 | } |
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| 252 | |
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| 253 | /*---------------------------------------------------------------------- |
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| 254 | * |
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| 255 | * Tcl_SourceRCFile -- |
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| 256 | * |
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| 257 | * This function is typically invoked by Tcl_Main of Tk_Main function to |
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| 258 | * source an application specific rc file into the interpreter at startup |
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| 259 | * time. |
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| 260 | * |
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| 261 | * Results: |
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| 262 | * None. |
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| 263 | * |
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| 264 | * Side effects: |
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| 265 | * Depends on what's in the rc script. |
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| 266 | * |
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| 267 | *---------------------------------------------------------------------- |
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| 268 | */ |
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| 269 | |
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| 270 | void |
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| 271 | Tcl_SourceRCFile( |
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| 272 | Tcl_Interp *interp) /* Interpreter to source rc file into. */ |
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| 273 | { |
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| 274 | Tcl_DString temp; |
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| 275 | CONST char *fileName; |
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| 276 | Tcl_Channel errChannel; |
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| 277 | |
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| 278 | fileName = Tcl_GetVar(interp, "tcl_rcFileName", TCL_GLOBAL_ONLY); |
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| 279 | if (fileName != NULL) { |
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| 280 | Tcl_Channel c; |
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| 281 | CONST char *fullName; |
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| 282 | |
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| 283 | Tcl_DStringInit(&temp); |
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| 284 | fullName = Tcl_TranslateFileName(interp, fileName, &temp); |
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| 285 | if (fullName == NULL) { |
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| 286 | /* |
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| 287 | * Couldn't translate the file name (e.g. it referred to a bogus |
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| 288 | * user or there was no HOME environment variable). Just do |
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| 289 | * nothing. |
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| 290 | */ |
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| 291 | } else { |
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| 292 | /* |
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| 293 | * Test for the existence of the rc file before trying to read it. |
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| 294 | */ |
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| 295 | |
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| 296 | c = Tcl_OpenFileChannel(NULL, fullName, "r", 0); |
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| 297 | if (c != (Tcl_Channel) NULL) { |
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| 298 | Tcl_Close(NULL, c); |
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| 299 | if (Tcl_EvalFile(interp, fullName) != TCL_OK) { |
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| 300 | errChannel = Tcl_GetStdChannel(TCL_STDERR); |
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| 301 | if (errChannel) { |
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| 302 | Tcl_WriteObj(errChannel, Tcl_GetObjResult(interp)); |
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| 303 | Tcl_WriteChars(errChannel, "\n", 1); |
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| 304 | } |
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| 305 | } |
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| 306 | } |
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| 307 | } |
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| 308 | Tcl_DStringFree(&temp); |
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| 309 | } |
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| 310 | } |
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| 311 | |
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| 312 | /*---------------------------------------------------------------------- |
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| 313 | * |
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| 314 | * Tcl_Main -- |
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| 315 | * |
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| 316 | * Main program for tclsh and most other Tcl-based applications. |
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| 317 | * |
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| 318 | * Results: |
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| 319 | * None. This function never returns (it exits the process when it's |
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| 320 | * done). |
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| 321 | * |
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| 322 | * Side effects: |
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| 323 | * This function initializes the Tcl world and then starts interpreting |
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| 324 | * commands; almost anything could happen, depending on the script being |
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| 325 | * interpreted. |
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| 326 | * |
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| 327 | *---------------------------------------------------------------------- |
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| 328 | */ |
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| 329 | |
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| 330 | void |
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| 331 | Tcl_Main( |
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| 332 | int argc, /* Number of arguments. */ |
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| 333 | char **argv, /* Array of argument strings. */ |
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| 334 | Tcl_AppInitProc *appInitProc) |
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| 335 | /* Application-specific initialization |
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| 336 | * function to call after most initialization |
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| 337 | * but before starting to execute commands. */ |
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| 338 | { |
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| 339 | Tcl_Obj *path, *resultPtr, *argvPtr, *commandPtr = NULL; |
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| 340 | CONST char *encodingName = NULL; |
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| 341 | PromptType prompt = PROMPT_START; |
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| 342 | int code, length, tty, exitCode = 0; |
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| 343 | Tcl_Channel inChannel, outChannel, errChannel; |
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| 344 | Tcl_Interp *interp; |
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| 345 | Tcl_DString appName; |
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| 346 | |
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| 347 | Tcl_FindExecutable(argv[0]); |
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| 348 | |
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| 349 | interp = Tcl_CreateInterp(); |
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| 350 | Tcl_InitMemory(interp); |
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| 351 | |
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| 352 | /* |
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| 353 | * If the application has not already set a startup script, parse the |
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| 354 | * first few command line arguments to determine the script path and |
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| 355 | * encoding. |
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| 356 | */ |
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| 357 | |
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| 358 | if (NULL == Tcl_GetStartupScript(NULL)) { |
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| 359 | |
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| 360 | /* |
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| 361 | * Check whether first 3 args (argv[1] - argv[3]) look like |
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| 362 | * -encoding ENCODING FILENAME |
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| 363 | * or like |
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| 364 | * FILENAME |
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| 365 | */ |
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| 366 | |
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| 367 | if ((argc > 3) && (0 == strcmp("-encoding", argv[1])) |
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| 368 | && ('-' != argv[3][0])) { |
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| 369 | Tcl_SetStartupScript(Tcl_NewStringObj(argv[3], -1), argv[2]); |
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| 370 | argc -= 3; |
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| 371 | argv += 3; |
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| 372 | } else if ((argc > 1) && ('-' != argv[1][0])) { |
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| 373 | Tcl_SetStartupScript(Tcl_NewStringObj(argv[1], -1), NULL); |
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| 374 | argc--; |
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| 375 | argv++; |
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| 376 | } |
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| 377 | } |
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| 378 | |
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| 379 | path = Tcl_GetStartupScript(&encodingName); |
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| 380 | if (path == NULL) { |
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| 381 | Tcl_ExternalToUtfDString(NULL, argv[0], -1, &appName); |
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| 382 | } else { |
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| 383 | CONST char *pathName = Tcl_GetStringFromObj(path, &length); |
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| 384 | Tcl_ExternalToUtfDString(NULL, pathName, length, &appName); |
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| 385 | path = Tcl_NewStringObj(Tcl_DStringValue(&appName), -1); |
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| 386 | Tcl_SetStartupScript(path, encodingName); |
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| 387 | } |
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| 388 | Tcl_SetVar(interp, "argv0", Tcl_DStringValue(&appName), TCL_GLOBAL_ONLY); |
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| 389 | Tcl_DStringFree(&appName); |
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| 390 | argc--; |
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| 391 | argv++; |
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| 392 | |
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| 393 | Tcl_SetVar2Ex(interp, "argc", NULL, Tcl_NewIntObj(argc), TCL_GLOBAL_ONLY); |
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| 394 | |
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| 395 | argvPtr = Tcl_NewListObj(0, NULL); |
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| 396 | while (argc--) { |
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| 397 | Tcl_DString ds; |
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| 398 | Tcl_ExternalToUtfDString(NULL, *argv++, -1, &ds); |
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| 399 | Tcl_ListObjAppendElement(NULL, argvPtr, Tcl_NewStringObj( |
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| 400 | Tcl_DStringValue(&ds), Tcl_DStringLength(&ds))); |
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| 401 | Tcl_DStringFree(&ds); |
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| 402 | } |
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| 403 | Tcl_SetVar2Ex(interp, "argv", NULL, argvPtr, TCL_GLOBAL_ONLY); |
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| 404 | |
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| 405 | /* |
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| 406 | * Set the "tcl_interactive" variable. |
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| 407 | */ |
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| 408 | |
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| 409 | tty = isatty(0); |
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| 410 | Tcl_SetVar(interp, "tcl_interactive", ((path == NULL) && tty) ? "1" : "0", |
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| 411 | TCL_GLOBAL_ONLY); |
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| 412 | |
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| 413 | /* |
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| 414 | * Invoke application-specific initialization. |
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| 415 | */ |
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| 416 | |
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| 417 | Tcl_Preserve((ClientData) interp); |
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| 418 | if ((*appInitProc)(interp) != TCL_OK) { |
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| 419 | errChannel = Tcl_GetStdChannel(TCL_STDERR); |
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| 420 | if (errChannel) { |
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| 421 | Tcl_WriteChars(errChannel, |
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| 422 | "application-specific initialization failed: ", -1); |
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| 423 | Tcl_WriteObj(errChannel, Tcl_GetObjResult(interp)); |
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| 424 | Tcl_WriteChars(errChannel, "\n", 1); |
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| 425 | } |
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| 426 | } |
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| 427 | if (Tcl_InterpDeleted(interp)) { |
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| 428 | goto done; |
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| 429 | } |
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| 430 | if (Tcl_LimitExceeded(interp)) { |
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| 431 | goto done; |
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| 432 | } |
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| 433 | |
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| 434 | /* |
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| 435 | * If a script file was specified then just source that file and quit. |
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| 436 | * Must fetch it again, as the appInitProc might have reset it. |
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| 437 | */ |
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| 438 | |
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| 439 | path = Tcl_GetStartupScript(&encodingName); |
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| 440 | if (path != NULL) { |
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| 441 | code = Tcl_FSEvalFileEx(interp, path, encodingName); |
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| 442 | if (code != TCL_OK) { |
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| 443 | errChannel = Tcl_GetStdChannel(TCL_STDERR); |
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| 444 | if (errChannel) { |
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| 445 | Tcl_Obj *options = Tcl_GetReturnOptions(interp, code); |
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| 446 | Tcl_Obj *keyPtr, *valuePtr; |
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| 447 | |
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| 448 | TclNewLiteralStringObj(keyPtr, "-errorinfo"); |
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| 449 | Tcl_IncrRefCount(keyPtr); |
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| 450 | Tcl_DictObjGet(NULL, options, keyPtr, &valuePtr); |
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| 451 | Tcl_DecrRefCount(keyPtr); |
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| 452 | |
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| 453 | if (valuePtr) { |
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| 454 | Tcl_WriteObj(errChannel, valuePtr); |
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| 455 | } |
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| 456 | Tcl_WriteChars(errChannel, "\n", 1); |
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| 457 | } |
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| 458 | exitCode = 1; |
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| 459 | } |
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| 460 | goto done; |
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| 461 | } |
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| 462 | |
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| 463 | /* |
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| 464 | * We're running interactively. Source a user-specific startup file if the |
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| 465 | * application specified one and if the file exists. |
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| 466 | */ |
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| 467 | |
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| 468 | Tcl_SourceRCFile(interp); |
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| 469 | if (Tcl_LimitExceeded(interp)) { |
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| 470 | goto done; |
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| 471 | } |
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| 472 | |
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| 473 | /* |
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| 474 | * Process commands from stdin until there's an end-of-file. Note that we |
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| 475 | * need to fetch the standard channels again after every eval, since they |
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| 476 | * may have been changed. |
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| 477 | */ |
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| 478 | |
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| 479 | commandPtr = Tcl_NewObj(); |
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| 480 | Tcl_IncrRefCount(commandPtr); |
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| 481 | |
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| 482 | /* |
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| 483 | * Get a new value for tty if anyone writes to ::tcl_interactive |
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| 484 | */ |
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| 485 | |
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| 486 | Tcl_LinkVar(interp, "tcl_interactive", (char *) &tty, TCL_LINK_BOOLEAN); |
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| 487 | inChannel = Tcl_GetStdChannel(TCL_STDIN); |
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| 488 | outChannel = Tcl_GetStdChannel(TCL_STDOUT); |
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| 489 | while ((inChannel != (Tcl_Channel) NULL) && !Tcl_InterpDeleted(interp)) { |
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| 490 | if (mainLoopProc == NULL) { |
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| 491 | if (tty) { |
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| 492 | Prompt(interp, &prompt); |
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| 493 | if (Tcl_InterpDeleted(interp)) { |
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| 494 | break; |
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| 495 | } |
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| 496 | if (Tcl_LimitExceeded(interp)) { |
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| 497 | break; |
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| 498 | } |
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| 499 | inChannel = Tcl_GetStdChannel(TCL_STDIN); |
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| 500 | if (inChannel == (Tcl_Channel) NULL) { |
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| 501 | break; |
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| 502 | } |
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| 503 | } |
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| 504 | if (Tcl_IsShared(commandPtr)) { |
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| 505 | Tcl_DecrRefCount(commandPtr); |
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| 506 | commandPtr = Tcl_DuplicateObj(commandPtr); |
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| 507 | Tcl_IncrRefCount(commandPtr); |
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| 508 | } |
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| 509 | length = Tcl_GetsObj(inChannel, commandPtr); |
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| 510 | if (length < 0) { |
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| 511 | if (Tcl_InputBlocked(inChannel)) { |
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| 512 | /* |
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| 513 | * This can only happen if stdin has been set to |
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| 514 | * non-blocking. In that case cycle back and try again. |
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| 515 | * This sets up a tight polling loop (since we have no |
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| 516 | * event loop running). If this causes bad CPU hogging, |
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| 517 | * we might try toggling the blocking on stdin instead. |
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| 518 | */ |
---|
| 519 | |
---|
| 520 | continue; |
---|
| 521 | } |
---|
| 522 | |
---|
| 523 | /* |
---|
| 524 | * Either EOF, or an error on stdin; we're done |
---|
| 525 | */ |
---|
| 526 | |
---|
| 527 | break; |
---|
| 528 | } |
---|
| 529 | |
---|
| 530 | /* |
---|
| 531 | * Add the newline removed by Tcl_GetsObj back to the string. |
---|
| 532 | * Have to add it back before testing completeness, because |
---|
| 533 | * it can make a difference. [Bug 1775878]. |
---|
| 534 | */ |
---|
| 535 | |
---|
| 536 | if (Tcl_IsShared(commandPtr)) { |
---|
| 537 | Tcl_DecrRefCount(commandPtr); |
---|
| 538 | commandPtr = Tcl_DuplicateObj(commandPtr); |
---|
| 539 | Tcl_IncrRefCount(commandPtr); |
---|
| 540 | } |
---|
| 541 | Tcl_AppendToObj(commandPtr, "\n", 1); |
---|
| 542 | if (!TclObjCommandComplete(commandPtr)) { |
---|
| 543 | prompt = PROMPT_CONTINUE; |
---|
| 544 | continue; |
---|
| 545 | } |
---|
| 546 | |
---|
| 547 | prompt = PROMPT_START; |
---|
| 548 | /* |
---|
| 549 | * The final newline is syntactically redundant, and causes |
---|
| 550 | * some error messages troubles deeper in, so lop it back off. |
---|
| 551 | */ |
---|
| 552 | Tcl_GetStringFromObj(commandPtr, &length); |
---|
| 553 | Tcl_SetObjLength(commandPtr, --length); |
---|
| 554 | code = Tcl_RecordAndEvalObj(interp, commandPtr, TCL_EVAL_GLOBAL); |
---|
| 555 | inChannel = Tcl_GetStdChannel(TCL_STDIN); |
---|
| 556 | outChannel = Tcl_GetStdChannel(TCL_STDOUT); |
---|
| 557 | errChannel = Tcl_GetStdChannel(TCL_STDERR); |
---|
| 558 | Tcl_DecrRefCount(commandPtr); |
---|
| 559 | commandPtr = Tcl_NewObj(); |
---|
| 560 | Tcl_IncrRefCount(commandPtr); |
---|
| 561 | if (code != TCL_OK) { |
---|
| 562 | if (errChannel) { |
---|
| 563 | Tcl_WriteObj(errChannel, Tcl_GetObjResult(interp)); |
---|
| 564 | Tcl_WriteChars(errChannel, "\n", 1); |
---|
| 565 | } |
---|
| 566 | } else if (tty) { |
---|
| 567 | resultPtr = Tcl_GetObjResult(interp); |
---|
| 568 | Tcl_IncrRefCount(resultPtr); |
---|
| 569 | Tcl_GetStringFromObj(resultPtr, &length); |
---|
| 570 | if ((length > 0) && outChannel) { |
---|
| 571 | Tcl_WriteObj(outChannel, resultPtr); |
---|
| 572 | Tcl_WriteChars(outChannel, "\n", 1); |
---|
| 573 | } |
---|
| 574 | Tcl_DecrRefCount(resultPtr); |
---|
| 575 | } |
---|
| 576 | } else { /* (mainLoopProc != NULL) */ |
---|
| 577 | /* |
---|
| 578 | * If a main loop has been defined while running interactively, we |
---|
| 579 | * want to start a fileevent based prompt by establishing a |
---|
| 580 | * channel handler for stdin. |
---|
| 581 | */ |
---|
| 582 | |
---|
| 583 | InteractiveState *isPtr = NULL; |
---|
| 584 | |
---|
| 585 | if (inChannel) { |
---|
| 586 | if (tty) { |
---|
| 587 | Prompt(interp, &prompt); |
---|
| 588 | } |
---|
| 589 | isPtr = (InteractiveState *) |
---|
| 590 | ckalloc((int) sizeof(InteractiveState)); |
---|
| 591 | isPtr->input = inChannel; |
---|
| 592 | isPtr->tty = tty; |
---|
| 593 | isPtr->commandPtr = commandPtr; |
---|
| 594 | isPtr->prompt = prompt; |
---|
| 595 | isPtr->interp = interp; |
---|
| 596 | |
---|
| 597 | Tcl_UnlinkVar(interp, "tcl_interactive"); |
---|
| 598 | Tcl_LinkVar(interp, "tcl_interactive", (char *) &(isPtr->tty), |
---|
| 599 | TCL_LINK_BOOLEAN); |
---|
| 600 | |
---|
| 601 | Tcl_CreateChannelHandler(inChannel, TCL_READABLE, StdinProc, |
---|
| 602 | (ClientData) isPtr); |
---|
| 603 | } |
---|
| 604 | |
---|
| 605 | (*mainLoopProc)(); |
---|
| 606 | mainLoopProc = NULL; |
---|
| 607 | |
---|
| 608 | if (inChannel) { |
---|
| 609 | tty = isPtr->tty; |
---|
| 610 | Tcl_UnlinkVar(interp, "tcl_interactive"); |
---|
| 611 | Tcl_LinkVar(interp, "tcl_interactive", (char *) &tty, |
---|
| 612 | TCL_LINK_BOOLEAN); |
---|
| 613 | prompt = isPtr->prompt; |
---|
| 614 | commandPtr = isPtr->commandPtr; |
---|
| 615 | if (isPtr->input != (Tcl_Channel) NULL) { |
---|
| 616 | Tcl_DeleteChannelHandler(isPtr->input, StdinProc, |
---|
| 617 | (ClientData) isPtr); |
---|
| 618 | } |
---|
| 619 | ckfree((char *)isPtr); |
---|
| 620 | } |
---|
| 621 | inChannel = Tcl_GetStdChannel(TCL_STDIN); |
---|
| 622 | outChannel = Tcl_GetStdChannel(TCL_STDOUT); |
---|
| 623 | errChannel = Tcl_GetStdChannel(TCL_STDERR); |
---|
| 624 | } |
---|
| 625 | #ifdef TCL_MEM_DEBUG |
---|
| 626 | |
---|
| 627 | /* |
---|
| 628 | * This code here only for the (unsupported and deprecated) [checkmem] |
---|
| 629 | * command. |
---|
| 630 | */ |
---|
| 631 | |
---|
| 632 | if (tclMemDumpFileName != NULL) { |
---|
| 633 | mainLoopProc = NULL; |
---|
| 634 | Tcl_DeleteInterp(interp); |
---|
| 635 | } |
---|
| 636 | #endif |
---|
| 637 | } |
---|
| 638 | |
---|
| 639 | done: |
---|
| 640 | if ((exitCode == 0) && (mainLoopProc != NULL) |
---|
| 641 | && !Tcl_LimitExceeded(interp)) { |
---|
| 642 | /* |
---|
| 643 | * If everything has gone OK so far, call the main loop proc, if it |
---|
| 644 | * exists. Packages (like Tk) can set it to start processing events at |
---|
| 645 | * this point. |
---|
| 646 | */ |
---|
| 647 | |
---|
| 648 | (*mainLoopProc)(); |
---|
| 649 | mainLoopProc = NULL; |
---|
| 650 | } |
---|
| 651 | if (commandPtr != NULL) { |
---|
| 652 | Tcl_DecrRefCount(commandPtr); |
---|
| 653 | } |
---|
| 654 | |
---|
| 655 | /* |
---|
| 656 | * Rather than calling exit, invoke the "exit" command so that users can |
---|
| 657 | * replace "exit" with some other command to do additional cleanup on |
---|
| 658 | * exit. The Tcl_EvalObjEx call should never return. |
---|
| 659 | */ |
---|
| 660 | |
---|
| 661 | if (!Tcl_InterpDeleted(interp)) { |
---|
| 662 | if (!Tcl_LimitExceeded(interp)) { |
---|
| 663 | Tcl_Obj *cmd = Tcl_ObjPrintf("exit %d", exitCode); |
---|
| 664 | Tcl_IncrRefCount(cmd); |
---|
| 665 | Tcl_EvalObjEx(interp, cmd, TCL_EVAL_GLOBAL); |
---|
| 666 | Tcl_DecrRefCount(cmd); |
---|
| 667 | } |
---|
| 668 | |
---|
| 669 | /* |
---|
| 670 | * If Tcl_EvalObjEx returns, trying to eval [exit], something unusual |
---|
| 671 | * is happening. Maybe interp has been deleted; maybe [exit] was |
---|
| 672 | * redefined, maybe we've blown up because of an exceeded limit. We |
---|
| 673 | * still want to cleanup and exit. |
---|
| 674 | */ |
---|
| 675 | |
---|
| 676 | if (!Tcl_InterpDeleted(interp)) { |
---|
| 677 | Tcl_DeleteInterp(interp); |
---|
| 678 | } |
---|
| 679 | } |
---|
| 680 | Tcl_SetStartupScript(NULL, NULL); |
---|
| 681 | |
---|
| 682 | /* |
---|
| 683 | * If we get here, the master interp has been deleted. Allow its |
---|
| 684 | * destruction with the last matching Tcl_Release. |
---|
| 685 | */ |
---|
| 686 | |
---|
| 687 | Tcl_Release((ClientData) interp); |
---|
| 688 | Tcl_Exit(exitCode); |
---|
| 689 | } |
---|
| 690 | |
---|
| 691 | /* |
---|
| 692 | *--------------------------------------------------------------- |
---|
| 693 | * |
---|
| 694 | * Tcl_SetMainLoop -- |
---|
| 695 | * |
---|
| 696 | * Sets an alternative main loop function. |
---|
| 697 | * |
---|
| 698 | * Results: |
---|
| 699 | * Returns the previously defined main loop function. |
---|
| 700 | * |
---|
| 701 | * Side effects: |
---|
| 702 | * This function will be called before Tcl exits, allowing for the |
---|
| 703 | * creation of an event loop. |
---|
| 704 | * |
---|
| 705 | *--------------------------------------------------------------- |
---|
| 706 | */ |
---|
| 707 | |
---|
| 708 | void |
---|
| 709 | Tcl_SetMainLoop( |
---|
| 710 | Tcl_MainLoopProc *proc) |
---|
| 711 | { |
---|
| 712 | mainLoopProc = proc; |
---|
| 713 | } |
---|
| 714 | |
---|
| 715 | /* |
---|
| 716 | *---------------------------------------------------------------------- |
---|
| 717 | * |
---|
| 718 | * StdinProc -- |
---|
| 719 | * |
---|
| 720 | * This function is invoked by the event dispatcher whenever standard |
---|
| 721 | * input becomes readable. It grabs the next line of input characters, |
---|
| 722 | * adds them to a command being assembled, and executes the command if |
---|
| 723 | * it's complete. |
---|
| 724 | * |
---|
| 725 | * Results: |
---|
| 726 | * None. |
---|
| 727 | * |
---|
| 728 | * Side effects: |
---|
| 729 | * Could be almost arbitrary, depending on the command that's typed. |
---|
| 730 | * |
---|
| 731 | *---------------------------------------------------------------------- |
---|
| 732 | */ |
---|
| 733 | |
---|
| 734 | /* ARGSUSED */ |
---|
| 735 | static void |
---|
| 736 | StdinProc( |
---|
| 737 | ClientData clientData, /* The state of interactive cmd line */ |
---|
| 738 | int mask) /* Not used. */ |
---|
| 739 | { |
---|
| 740 | InteractiveState *isPtr = (InteractiveState *) clientData; |
---|
| 741 | Tcl_Channel chan = isPtr->input; |
---|
| 742 | Tcl_Obj *commandPtr = isPtr->commandPtr; |
---|
| 743 | Tcl_Interp *interp = isPtr->interp; |
---|
| 744 | int code, length; |
---|
| 745 | |
---|
| 746 | if (Tcl_IsShared(commandPtr)) { |
---|
| 747 | Tcl_DecrRefCount(commandPtr); |
---|
| 748 | commandPtr = Tcl_DuplicateObj(commandPtr); |
---|
| 749 | Tcl_IncrRefCount(commandPtr); |
---|
| 750 | } |
---|
| 751 | length = Tcl_GetsObj(chan, commandPtr); |
---|
| 752 | if (length < 0) { |
---|
| 753 | if (Tcl_InputBlocked(chan)) { |
---|
| 754 | return; |
---|
| 755 | } |
---|
| 756 | if (isPtr->tty) { |
---|
| 757 | /* |
---|
| 758 | * Would be better to find a way to exit the mainLoop? Or perhaps |
---|
| 759 | * evaluate [exit]? Leaving as is for now due to compatibility |
---|
| 760 | * concerns. |
---|
| 761 | */ |
---|
| 762 | |
---|
| 763 | Tcl_Exit(0); |
---|
| 764 | } |
---|
| 765 | Tcl_DeleteChannelHandler(chan, StdinProc, (ClientData) isPtr); |
---|
| 766 | return; |
---|
| 767 | } |
---|
| 768 | |
---|
| 769 | if (Tcl_IsShared(commandPtr)) { |
---|
| 770 | Tcl_DecrRefCount(commandPtr); |
---|
| 771 | commandPtr = Tcl_DuplicateObj(commandPtr); |
---|
| 772 | Tcl_IncrRefCount(commandPtr); |
---|
| 773 | } |
---|
| 774 | Tcl_AppendToObj(commandPtr, "\n", 1); |
---|
| 775 | if (!TclObjCommandComplete(commandPtr)) { |
---|
| 776 | isPtr->prompt = PROMPT_CONTINUE; |
---|
| 777 | goto prompt; |
---|
| 778 | } |
---|
| 779 | isPtr->prompt = PROMPT_START; |
---|
| 780 | Tcl_GetStringFromObj(commandPtr, &length); |
---|
| 781 | Tcl_SetObjLength(commandPtr, --length); |
---|
| 782 | |
---|
| 783 | /* |
---|
| 784 | * Disable the stdin channel handler while evaluating the command; |
---|
| 785 | * otherwise if the command re-enters the event loop we might process |
---|
| 786 | * commands from stdin before the current command is finished. Among other |
---|
| 787 | * things, this will trash the text of the command being evaluated. |
---|
| 788 | */ |
---|
| 789 | |
---|
| 790 | Tcl_CreateChannelHandler(chan, 0, StdinProc, (ClientData) isPtr); |
---|
| 791 | code = Tcl_RecordAndEvalObj(interp, commandPtr, TCL_EVAL_GLOBAL); |
---|
| 792 | isPtr->input = chan = Tcl_GetStdChannel(TCL_STDIN); |
---|
| 793 | Tcl_DecrRefCount(commandPtr); |
---|
| 794 | isPtr->commandPtr = commandPtr = Tcl_NewObj(); |
---|
| 795 | Tcl_IncrRefCount(commandPtr); |
---|
| 796 | if (chan != (Tcl_Channel) NULL) { |
---|
| 797 | Tcl_CreateChannelHandler(chan, TCL_READABLE, StdinProc, |
---|
| 798 | (ClientData) isPtr); |
---|
| 799 | } |
---|
| 800 | if (code != TCL_OK) { |
---|
| 801 | Tcl_Channel errChannel = Tcl_GetStdChannel(TCL_STDERR); |
---|
| 802 | if (errChannel != (Tcl_Channel) NULL) { |
---|
| 803 | Tcl_WriteObj(errChannel, Tcl_GetObjResult(interp)); |
---|
| 804 | Tcl_WriteChars(errChannel, "\n", 1); |
---|
| 805 | } |
---|
| 806 | } else if (isPtr->tty) { |
---|
| 807 | Tcl_Obj *resultPtr = Tcl_GetObjResult(interp); |
---|
| 808 | Tcl_Channel outChannel = Tcl_GetStdChannel(TCL_STDOUT); |
---|
| 809 | Tcl_IncrRefCount(resultPtr); |
---|
| 810 | Tcl_GetStringFromObj(resultPtr, &length); |
---|
| 811 | if ((length >0) && (outChannel != (Tcl_Channel) NULL)) { |
---|
| 812 | Tcl_WriteObj(outChannel, resultPtr); |
---|
| 813 | Tcl_WriteChars(outChannel, "\n", 1); |
---|
| 814 | } |
---|
| 815 | Tcl_DecrRefCount(resultPtr); |
---|
| 816 | } |
---|
| 817 | |
---|
| 818 | /* |
---|
| 819 | * If a tty stdin is still around, output a prompt. |
---|
| 820 | */ |
---|
| 821 | |
---|
| 822 | prompt: |
---|
| 823 | if (isPtr->tty && (isPtr->input != (Tcl_Channel) NULL)) { |
---|
| 824 | Prompt(interp, &(isPtr->prompt)); |
---|
| 825 | isPtr->input = Tcl_GetStdChannel(TCL_STDIN); |
---|
| 826 | } |
---|
| 827 | } |
---|
| 828 | |
---|
| 829 | /* |
---|
| 830 | *---------------------------------------------------------------------- |
---|
| 831 | * |
---|
| 832 | * Prompt -- |
---|
| 833 | * |
---|
| 834 | * Issue a prompt on standard output, or invoke a script to issue the |
---|
| 835 | * prompt. |
---|
| 836 | * |
---|
| 837 | * Results: |
---|
| 838 | * None. |
---|
| 839 | * |
---|
| 840 | * Side effects: |
---|
| 841 | * A prompt gets output, and a Tcl script may be evaluated in interp. |
---|
| 842 | * |
---|
| 843 | *---------------------------------------------------------------------- |
---|
| 844 | */ |
---|
| 845 | |
---|
| 846 | static void |
---|
| 847 | Prompt( |
---|
| 848 | Tcl_Interp *interp, /* Interpreter to use for prompting. */ |
---|
| 849 | PromptType *promptPtr) /* Points to type of prompt to print. Filled |
---|
| 850 | * with PROMPT_NONE after a prompt is |
---|
| 851 | * printed. */ |
---|
| 852 | { |
---|
| 853 | Tcl_Obj *promptCmdPtr; |
---|
| 854 | int code; |
---|
| 855 | Tcl_Channel outChannel, errChannel; |
---|
| 856 | |
---|
| 857 | if (*promptPtr == PROMPT_NONE) { |
---|
| 858 | return; |
---|
| 859 | } |
---|
| 860 | |
---|
| 861 | promptCmdPtr = Tcl_GetVar2Ex(interp, |
---|
| 862 | ((*promptPtr == PROMPT_CONTINUE) ? "tcl_prompt2" : "tcl_prompt1"), |
---|
| 863 | NULL, TCL_GLOBAL_ONLY); |
---|
| 864 | |
---|
| 865 | if (Tcl_InterpDeleted(interp)) { |
---|
| 866 | return; |
---|
| 867 | } |
---|
| 868 | if (promptCmdPtr == NULL) { |
---|
| 869 | defaultPrompt: |
---|
| 870 | outChannel = Tcl_GetStdChannel(TCL_STDOUT); |
---|
| 871 | if ((*promptPtr == PROMPT_START) |
---|
| 872 | && (outChannel != (Tcl_Channel) NULL)) { |
---|
| 873 | Tcl_WriteChars(outChannel, DEFAULT_PRIMARY_PROMPT, |
---|
| 874 | strlen(DEFAULT_PRIMARY_PROMPT)); |
---|
| 875 | } |
---|
| 876 | } else { |
---|
| 877 | code = Tcl_EvalObjEx(interp, promptCmdPtr, TCL_EVAL_GLOBAL); |
---|
| 878 | if (code != TCL_OK) { |
---|
| 879 | Tcl_AddErrorInfo(interp, |
---|
| 880 | "\n (script that generates prompt)"); |
---|
| 881 | errChannel = Tcl_GetStdChannel(TCL_STDERR); |
---|
| 882 | if (errChannel != (Tcl_Channel) NULL) { |
---|
| 883 | Tcl_WriteObj(errChannel, Tcl_GetObjResult(interp)); |
---|
| 884 | Tcl_WriteChars(errChannel, "\n", 1); |
---|
| 885 | } |
---|
| 886 | goto defaultPrompt; |
---|
| 887 | } |
---|
| 888 | } |
---|
| 889 | |
---|
| 890 | outChannel = Tcl_GetStdChannel(TCL_STDOUT); |
---|
| 891 | if (outChannel != (Tcl_Channel) NULL) { |
---|
| 892 | Tcl_Flush(outChannel); |
---|
| 893 | } |
---|
| 894 | *promptPtr = PROMPT_NONE; |
---|
| 895 | } |
---|
| 896 | |
---|
| 897 | /* |
---|
| 898 | * Local Variables: |
---|
| 899 | * mode: c |
---|
| 900 | * c-basic-offset: 4 |
---|
| 901 | * fill-column: 78 |
---|
| 902 | * End: |
---|
| 903 | */ |
---|