diff options
| -rw-r--r-- | ChangeLog | 5 | ||||
| -rw-r--r-- | generic/tclCmdIL.c | 114 |
2 files changed, 83 insertions, 36 deletions
@@ -1,3 +1,8 @@ +2009-08-20 Donal K. Fellows <dkf@users.sf.net> + + * generic/tclCmdIL.c (TclNRIfObjCmd): [Bug 2823276]: Make [if] + NRE-safe on all arguments when interpreted. + 2009-08-19 Donal K. Fellows <dkf@users.sf.net> * generic/tclCmdAH.c (TclNRForObjCmd, etc.): [Bug 2823276]: Make [for] diff --git a/generic/tclCmdIL.c b/generic/tclCmdIL.c index 0049b18..274d9b8 100644 --- a/generic/tclCmdIL.c +++ b/generic/tclCmdIL.c @@ -16,7 +16,7 @@ * See the file "license.terms" for information on usage and redistribution of * this file, and for a DISCLAIMER OF ALL WARRANTIES. * - * RCS: @(#) $Id: tclCmdIL.c,v 1.168 2009/07/16 21:24:39 dgp Exp $ + * RCS: @(#) $Id: tclCmdIL.c,v 1.169 2009/08/19 23:23:22 dkf Exp $ */ #include "tclInt.h" @@ -104,6 +104,8 @@ typedef struct SortInfo { */ static int DictionaryCompare(const char *left, const char *right); +static int IfConditionCallback(ClientData data[], + Tcl_Interp *interp, int result); static int InfoArgsCmd(ClientData dummy, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]); static int InfoBodyCmd(ClientData dummy, Tcl_Interp *interp, @@ -219,40 +221,55 @@ TclNRIfObjCmd( int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* Argument objects. */ { - int thenScriptIndex = 0; /* "then" script to be evaled after syntax - * check. */ + Tcl_Obj *boolObj; + + if (objc <= 1) { + Tcl_AppendResult(interp, "wrong # args: no expression after \"", + TclGetString(objv[0]), "\" argument", NULL); + Tcl_SetErrorCode(interp, "TCL", "WRONGARGS", NULL); + return TCL_ERROR; + } + + /* + * At this point, objv[1] refers to the main expression to test. The + * arguments after the expression must be "then" (optional) and a script + * to execute if the expression is true. + */ + + TclNewObj(boolObj); + Tcl_NRAddCallback(interp, IfConditionCallback, INT2PTR(objc), + (ClientData) objv, INT2PTR(1), boolObj); + return Tcl_NRExprObj(interp, objv[1], boolObj); +} + +static int +IfConditionCallback( + ClientData data[], + Tcl_Interp *interp, + int result) +{ Interp *iPtr = (Interp *) interp; - int i, result, value; + int objc = PTR2INT(data[0]); + Tcl_Obj *const *objv = data[1]; + int i = PTR2INT(data[2]); + Tcl_Obj *boolObj = data[3]; + int value, thenScriptIndex = 0; const char *clause; - i = 1; - while (1) { - /* - * At this point in the loop, objv and objc refer to an expression to - * test, either for the main expression or an expression following an - * "elseif". The arguments after the expression must be "then" - * (optional) and a script to execute if the expression is true. - */ + if (result != TCL_OK) { + TclDecrRefCount(boolObj); + return result; + } + if (Tcl_GetBooleanFromObj(interp, boolObj, &value) != TCL_OK) { + TclDecrRefCount(boolObj); + return TCL_ERROR; + } + TclDecrRefCount(boolObj); - if (i >= objc) { - clause = TclGetString(objv[i-1]); - Tcl_AppendResult(interp, "wrong # args: ", - "no expression after \"", clause, "\" argument", NULL); - return TCL_ERROR; - } - if (!thenScriptIndex) { - result = Tcl_ExprBooleanObj(interp, objv[i], &value); - if (result != TCL_OK) { - return result; - } - } + while (1) { i++; if (i >= objc) { - missingScript: - clause = TclGetString(objv[i-1]); - Tcl_AppendResult(interp, "wrong # args: ", - "no script following \"", clause, "\" argument", NULL); - return TCL_ERROR; + goto missingScript; } clause = TclGetString(objv[i]); if ((i < objc) && (strcmp(clause, "then") == 0)) { @@ -284,11 +301,30 @@ TclNRIfObjCmd( return TCL_OK; } clause = TclGetString(objv[i]); - if ((clause[0] == 'e') && (strcmp(clause, "elseif") == 0)) { - i++; - continue; + if ((clause[0] != 'e') || (strcmp(clause, "elseif") != 0)) { + break; + } + i++; + + /* + * At this point in the loop, objv and objc refer to an expression to + * test, either for the main expression or an expression following an + * "elseif". The arguments after the expression must be "then" + * (optional) and a script to execute if the expression is true. + */ + + if (i >= objc) { + Tcl_AppendResult(interp, "wrong # args: ", + "no expression after \"", clause, "\" argument", NULL); + Tcl_SetErrorCode(interp, "TCL", "WRONGARGS", NULL); + return TCL_ERROR; + } + if (!thenScriptIndex) { + TclNewObj(boolObj); + Tcl_NRAddCallback(interp, IfConditionCallback, data[0], data[1], + INT2PTR(i), boolObj); + return Tcl_NRExprObj(interp, objv[i], boolObj); } - break; } /* @@ -300,14 +336,13 @@ TclNRIfObjCmd( if (strcmp(clause, "else") == 0) { i++; if (i >= objc) { - Tcl_AppendResult(interp, "wrong # args: ", - "no script following \"else\" argument", NULL); - return TCL_ERROR; + goto missingScript; } } if (i < objc - 1) { Tcl_AppendResult(interp, "wrong # args: ", "extra words after \"else\" clause in \"if\" command", NULL); + Tcl_SetErrorCode(interp, "TCL", "WRONGARGS", NULL); return TCL_ERROR; } if (thenScriptIndex) { @@ -319,6 +354,13 @@ TclNRIfObjCmd( iPtr->cmdFramePtr, thenScriptIndex); } return TclNREvalObjEx(interp, objv[i], 0, iPtr->cmdFramePtr, i); + + missingScript: + clause = TclGetString(objv[i-1]); + Tcl_AppendResult(interp, "wrong # args: no script following \"", clause, + "\" argument", NULL); + Tcl_SetErrorCode(interp, "TCL", "WRONGARGS", NULL); + return TCL_ERROR; } /* |