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Inside Macintosh: Text /

Chapter 5 - Text Utilities / Text Utilities Reference

Routines / Modifying Characters and Diacritical Marks

LowercaseText

The LowercaseText procedure converts any uppercase characters in a text string into their lowercase equivalents. The text string can be up to 32 KB in length.

PROCEDURE LowercaseText (textPtr: Ptr; len: Integer;
                         script: ScriptCode);

textPtr

A pointer to the text string to be converted.

len

The number of bytes in the text string.

script

The script code for the script system whose resources are used to determine the results of converting characters.

DESCRIPTION

LowercaseText traverses the characters starting at the address specified by textPtr and continues for the number of characters specified in len. It converts any uppercase characters in the text into lowercase.

The conversion uses tables in the string-manipulation ('itl2') resource of the script specified by the value of the script parameter. The possible values for script codes are listed in the chapter "Script Manager" of this book. You can specify smSystemScript to use the system script and smCurrentScript to use the script of the current font in the current graphics port.

If LowercaseText cannot access the specified resource, it generates an error code and does not modify the string. You need to call the ResError function to determine which, if any, error occurred. ResError is described in the Resource Manager chapter of the book Inside Macintosh: More Macintosh Toolbox.

SPECIAL CONSIDERATIONS

LowercaseText may move memory; your application should not call this procedure at interrupt time.

ASSEMBLY-LANGUAGE INFORMATION

The trap macro for the LowercaseText procedure is

Trap macro
_LowerText

The registers on entry and exit for this routine are

Registers on entry
A0	pointer to first character of string
D0	length of string in bytes (word); must be less than 32 KB

Registers on exit
D0	result code

RESULT CODES

noErr	0	No error
resNotFound	-192	Can't get correct 'itl2' resource or resource is not in current format