1 /****************************************************************************
2 * Copyright 2018-2020,2022 Thomas E. Dickey *
3 * Copyright 2004-2009,2016 Free Software Foundation, Inc. *
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28 ****************************************************************************/
30 /****************************************************************************
31 * Author: Thomas E. Dickey *
32 ****************************************************************************/
37 ** The routine winsnstr().
41 #include <curses.priv.h>
44 MODULE_ID("$Id: lib_insnstr.c,v 1.8 2022/05/21 17:35:15 tom Exp $")
47 winsnstr(WINDOW *win, const char *s, int n)
50 const unsigned char *str = (const unsigned char *) s;
52 T((T_CALLED("winsnstr(%p,%s,%d)"), (void *) win, _nc_visbufn(s, n), n));
54 if (win != 0 && str != 0) {
55 SCREEN *sp = _nc_screen_of(win);
58 * If the output contains "wide" (multibyte) characters, we will not
59 * really know the width of a character until we get the last byte
60 * of the character. Since the preceding byte(s) may use more columns
61 * on the screen than the final character, it is best to route the
62 * call to the wins_nwstr() function.
64 if (sp->_screen_unicode) {
65 size_t nn = (n > 0) ? (size_t) n : strlen(s);
66 wchar_t *buffer = typeMalloc(wchar_t, nn + 1);
71 n3 = mbstowcs(buffer, s, nn);
72 if (n3 != (size_t) (-1)) {
74 code = wins_nwstr(win, buffer, (int) n3);
82 NCURSES_SIZE_T oy = win->_cury;
83 NCURSES_SIZE_T ox = win->_curx;
84 const unsigned char *cp;
86 for (cp = str; (n <= 0 || (cp - str) < n) && *cp; cp++) {
87 _nc_insert_ch(sp, win, (chtype) UChar(*cp));