CentOS 7.0 - man page for xmtextgetsubstring (centos section 3)
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XmTextGetSubstring(library call) XmTextGetSubstring(library call)
XmTextGetSubstring -- A Text function that retrieves a copy of a portion of the internal
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 buf-
fer 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
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.
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
For a complete definition of Text and its associated resources, see XmText(3).
The function was successful.
The function failed because it was unable to copy the specified number of char-
acters into the buffer provided. The buffer size may be insufficient. The con-
tents of buffer are undefined.
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
XmText(3) and XmTextGetSubstringWcs(3).
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