XmTextPosition - Man Page

#include <Xm/Xm​.h>

XmTextPosition is an integer data type that holds a character​'s position within a text string for Text and TextField​.

An XmTextPosition value conceptually points to the gap between two characters​. For example, consider a text string consisting of N characters​. A value of 0 refers to the position immediately prior to the first character​. A value of 1 refers to the position in between the first and second characters​. A value of N refers to the position immediately following the last character​. Therefore, the text string of N characters actually contains N + 1 positions​.

XmText(3)​.