CentOS 7.0 - man page for delch (centos section 3X)
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delch, wdelch, mvdelch, mvwdelch - delete character under the cursor in a curses window
int wdelch(WINDOW *win);
int mvdelch(int y, int x);
int mvwdelch(WINDOW *win, int y, int x);
These routines delete the character under the cursor; all characters to the right of the
cursor on the same line are moved to the left one position and the last character on the
line is filled with a blank. The cursor position does not change (after moving to y, x,
if specified). (This does not imply use of the hardware delete character feature.)
All routines return the integer ERR upon failure and an OK (SVr4 specifies only "an inte-
ger value other than ERR") upon successful completion.
Functions with a "mv" prefix first perform a cursor movement using wmove, and return an
error if the position is outside the window, or if the window pointer is null.
Note that delch, mvdelch, and mvwdelch may be macros.
These functions are described in the XSI Curses standard, Issue 4. The standard specifies
that they return ERR on failure, but specifies no error conditions.
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