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28 
29 /****************************************************************************
30  *  Author: Thomas E. Dickey                                                *
31  ****************************************************************************/
32 
33 /*
34 **	lib_insnstr.c
35 **
36 **	The routine winsnstr().
37 **
38 */
39 
40 #include <curses.priv.h>
41 #include <ctype.h>
42 
43 MODULE_ID("$Id: lib_insnstr.c,v 1.4 2016/02/20 21:22:46 tom Exp $")
44 
45 NCURSES_EXPORT(int)
46 winsnstr(WINDOW *win, const char *s, int n)
47 {
48     int code = ERR;
49     NCURSES_SIZE_T oy;
50     NCURSES_SIZE_T ox;
51     const unsigned char *str = (const unsigned char *) s;
52     const unsigned char *cp;
53 
54     T((T_CALLED("winsnstr(%p,%s,%d)"), (void *) win, _nc_visbufn(s, n), n));
55 
56     if (win != 0 && str != 0) {
57 	SCREEN *sp = _nc_screen_of(win);
58 #if USE_WIDEC_SUPPORT
59 	/*
60 	 * If the output contains "wide" (multibyte) characters, we will not
61 	 * really know the width of a character until we get the last byte
62 	 * of the character.  Since the preceding byte(s) may use more columns
63 	 * on the screen than the final character, it is best to route the
64 	 * call to the wins_nwstr() function.
65 	 */
66 	if (sp->_screen_unicode) {
67 	    size_t nn = (n > 0) ? (size_t) n : strlen(s);
68 	    wchar_t *buffer = typeMalloc(wchar_t, nn + 1);
69 	    if (buffer != 0) {
70 		mbstate_t state;
71 		size_t n3;
72 		init_mb(state);
73 		n3 = mbstowcs(buffer, s, nn);
74 		if (n3 != (size_t) (-1)) {
75 		    code = wins_nwstr(win, buffer, (int) n3);
76 		}
77 		free(buffer);
78 	    }
79 	}
80 	if (code == ERR)
81 #endif
82 	{
83 
84 	    oy = win->_cury;
85 	    ox = win->_curx;
86 	    for (cp = str; *cp && (n <= 0 || (cp - str) < n); cp++) {
87 		_nc_insert_ch(sp, win, (chtype) UChar(*cp));
88 	    }
89 	    win->_curx = ox;
90 	    win->_cury = oy;
91 	    _nc_synchook(win);
92 	    code = OK;
93 	}
94     }
95     returnCode(code);
96 }
97