diff options
Diffstat (limited to 'doc/StringObj.3')
| -rw-r--r-- | doc/StringObj.3 | 52 |
1 files changed, 30 insertions, 22 deletions
diff --git a/doc/StringObj.3 b/doc/StringObj.3 index e451c61..412ab78 100644 --- a/doc/StringObj.3 +++ b/doc/StringObj.3 @@ -60,7 +60,6 @@ void .sp void \fBTcl_AppendStringsToObjVA\fR(\fIobjPtr, argList\fR) -.VS 8.5 .sp void \fBTcl_AppendLimitedToObj\fR(\fIobjPtr, bytes, length, limit, ellipsis\fR) @@ -74,9 +73,8 @@ int Tcl_Obj * \fBTcl_ObjPrintf\fR(\fIformat, ...\fR) .sp -int +void \fBTcl_AppendPrintfToObj\fR(\fIobjPtr, format, ...\fR) -.VE 8.5 .sp void \fBTcl_SetObjLength\fR(\fIobjPtr, newLength\fR) @@ -127,13 +125,15 @@ the length of an object's string representation. .AP "const char" *string in Null-terminated string value to append to \fIobjPtr\fR. .AP va_list argList in -An argument list which must have been initialised using +An argument list which must have been initialized using \fBva_start\fR, and cleared using \fBva_end\fR. .AP int limit in Maximum number of bytes to be appended. .AP "const char" *ellipsis in Suffix to append when the limit leads to string truncation. -If NULL is passed then the suffix "..." is used. +If NULL is passed then the suffix +.QW "..." +is used. .AP "const char" *format in Format control string including % conversion specifiers. .AP int objc in @@ -144,7 +144,6 @@ The array of objects to format or concatenate. New length for the string value of \fIobjPtr\fR, not including the final null character. .BE - .SH DESCRIPTION .PP The procedures described in this manual entry allow Tcl objects to @@ -231,7 +230,7 @@ object's new string representation. \fIobjPtr\fR. If the object has an invalid Unicode representation, then \fIunicode\fR is converted to the UTF format and appended to the object's string representation. Appends are optimized to handle -repeated appends relatively efficiently (it overallocates the string +repeated appends relatively efficiently (it over-allocates the string or Unicode space to avoid repeated reallocations and copies of object's string value). .PP @@ -251,7 +250,6 @@ must be a NULL pointer to indicate the end of the list. except that instead of taking a variable number of arguments it takes an argument list. .PP -.VS 8.5 \fBTcl_AppendLimitedToObj\fR is similar to \fBTcl_AppendToObj\fR except that it imposes a limit on how many bytes are appended. This can be handy when the string to be appended might be @@ -275,9 +273,11 @@ bytes is necessary to append only whole multi-byte characters. \fBTcl_Format\fR is the C-level interface to the engine of the \fBformat\fR command. The actual command procedure for \fBformat\fR is little more than +.PP .CS -Tcl_Format(interp, Tcl_GetString(objv[1]), objc-2, objv+2); +\fBTcl_Format\fR(interp, \fBTcl_GetString\fR(objv[1]), objc-2, objv+2); .CE +.PP The \fIobjc\fR Tcl_Obj values in \fIobjv\fR are formatted into a string according to the conversion specification in \fIformat\fR argument, following the documentation for the \fBformat\fR command. The resulting formatted @@ -287,22 +287,26 @@ returned, and an error message is recorded in \fIinterp\fR, if \fIinterp\fR is non-NULL. .PP \fBTcl_AppendFormatToObj\fR is an appending alternative form -of \fBTcl_Format\fR with functionality equivalent to +of \fBTcl_Format\fR with functionality equivalent to: +.PP .CS -Tcl_Obj *newPtr = Tcl_Format(interp, format, objc, objv); +Tcl_Obj *newPtr = \fBTcl_Format\fR(interp, format, objc, objv); if (newPtr == NULL) return TCL_ERROR; -Tcl_AppendObjToObj(objPtr, newPtr); +\fBTcl_AppendObjToObj\fR(objPtr, newPtr); return TCL_OK; .CE +.PP but with greater convenience and efficiency when the appending functionality is needed. .PP \fBTcl_ObjPrintf\fR serves as a replacement for the common sequence +.PP .CS char buf[SOME_SUITABLE_LENGTH]; sprintf(buf, format, ...); -Tcl_NewStringObj(buf, -1); +\fBTcl_NewStringObj\fR(buf, -1); .CE +.PP but with greater convenience and no need to determine \fBSOME_SUITABLE_LENGTH\fR. The formatting is done with the same core formatting engine used by \fBTcl_Format\fR. This means the set of @@ -315,23 +319,29 @@ assumption that C code is more likely to know how many bytes it is passing around than the number of encoded characters those bytes happen to represent. The variable number of arguments passed in should be of the types that would be suitable for passing to \fBsprintf\fR. Note in -this example usage, \fIx\fR is of type \fBlong\fR. +this example usage, \fIx\fR is of type \fBint\fR. +.PP .CS -long x = 5; -Tcl_Obj *objPtr = Tcl_ObjPrintf("Value is %d", x); +int x = 5; +Tcl_Obj *objPtr = \fBTcl_ObjPrintf\fR("Value is %d", x); .CE +.PP If the value of \fIformat\fR contains internal inconsistencies or invalid specifier formats, the formatted string result produced by -\fBTcl_ObjPrintf\fR will be an error message describing the error. +\fBTcl_ObjPrintf\fR will be an error message describing the error. +It is impossible however to provide runtime protection against +mismatches between the format and any subsequent arguments. +Compile-time protection may be provided by some compilers. .PP \fBTcl_AppendPrintfToObj\fR is an appending alternative form of \fBTcl_ObjPrintf\fR with functionality equivalent to +.PP .CS -Tcl_AppendObjToObj(objPtr, Tcl_ObjPrintf(format, ...)); +\fBTcl_AppendObjToObj\fR(objPtr, \fBTcl_ObjPrintf\fR(format, ...)); .CE +.PP but with greater convenience and efficiency when the appending functionality is needed. -.VE 8.5 .PP The \fBTcl_SetObjLength\fR procedure changes the length of the string value of its \fIobjPtr\fR argument. If the \fInewLength\fR @@ -367,10 +377,8 @@ white space, then that object is ignored entirely. This white-space removal was added to make the output of the \fBconcat\fR command cleaner-looking. \fBTcl_ConcatObj\fR returns a pointer to a newly-created object whose ref count is zero. - .SH "SEE ALSO" -Tcl_NewObj, Tcl_IncrRefCount, Tcl_DecrRefCount, format, sprintf - +Tcl_NewObj(3), Tcl_IncrRefCount(3), Tcl_DecrRefCount(3), format(n), sprintf(3) .SH KEYWORDS append, internal representation, object, object type, string object, string type, string representation, concat, concatenate, unicode |