XmTextGetSubstring

Motif 2.1 Programmer's Reference

XmTextGetSubstring

A Text function that retrieves a copy of a portion of the internal text buffer

Format

#include <Xm/Text.h>
int XmTextGetSubstring
Widget
widgetXmTextPosition startint
num_charsint buffer_sizechar
*buffer

DESCRIPTION

XmTextGetSubstring retrieves a copy of a portion of the internal text buffer of a Text widget. The function copies a specified number of characters from a given start position in the internal text buffer into a buffer provided by the application. A NULL terminator is placed at the end of the copied data.

The size of the required buffer depends on the maximum number of bytes per character (MB_CUR_MAX) for the current locale. MB_CUR_MAX is a macro defined in stdlib.h . The buffer should be large enough to contain the substring to be copied and a NULL terminator. Use the following equation to calculate the size of buffer the application should provide:

 buffer_size =
( num_chars* MB_CUR_MAX) + 1
(VOID)

widget

Specifies the Text widget ID.

start

Specifies the beginning character position from which the data will be retrieved. This is an integer number of characters from the beginning of the text buffer. The first character position is 0 (zero).

num_chars

Specifies the number of characters to be copied into the provided buffer.

buffer_size

Specifies the size of the supplied buffer in bytes. This size should account for a NULL terminator.

buffer

Specifies the character buffer into which the internal text buffer will be copied.

For a complete definition of Text and its associated resources, see XmText (3).

RETURN

XmCOPY_SUCCEEDED

The function was successful.

XmCOPY_FAILED

The function failed because it was unable to copy the specified number of characters into the buffer provided. The buffer size may be insufficient. The contents of buffer are undefined.

XmCOPY_TRUNCATED

The requested number of characters extended beyond the internal buffer. The function copied characters between start and the end of the widget's buffer and terminated the string with a NULL terminator; fewer than num_chars characters were copied.

RELATED

XmText (3) and XmTextGetSubstringWcs (3).