1 /* $OpenBSD: lib_instr.c,v 1.4 2023/10/17 09:52:08 nicm Exp $ */ 2 3 /**************************************************************************** 4 * Copyright 2020-2021,2023 Thomas E. Dickey * 5 * Copyright 1998-2016,2017 Free Software Foundation, Inc. * 6 * * 7 * Permission is hereby granted, free of charge, to any person obtaining a * 8 * copy of this software and associated documentation files (the * 9 * "Software"), to deal in the Software without restriction, including * 10 * without limitation the rights to use, copy, modify, merge, publish, * 11 * distribute, distribute with modifications, sublicense, and/or sell * 12 * copies of the Software, and to permit persons to whom the Software is * 13 * furnished to do so, subject to the following conditions: * 14 * * 15 * The above copyright notice and this permission notice shall be included * 16 * in all copies or substantial portions of the Software. * 17 * * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * 19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * 20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * 21 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * 22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * 23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * 24 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * 25 * * 26 * Except as contained in this notice, the name(s) of the above copyright * 27 * holders shall not be used in advertising or otherwise to promote the * 28 * sale, use or other dealings in this Software without prior written * 29 * authorization. * 30 ****************************************************************************/ 31 32 /**************************************************************************** 33 * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 * 34 * and: Eric S. Raymond <esr@snark.thyrsus.com> * 35 * and: Thomas E. Dickey 1996-on * 36 ****************************************************************************/ 37 38 /* 39 ** lib_instr.c 40 ** 41 ** The routine winnstr(). 42 ** 43 */ 44 45 #include <curses.priv.h> 46 47 MODULE_ID("$Id: lib_instr.c,v 1.4 2023/10/17 09:52:08 nicm Exp $") 48 49 NCURSES_EXPORT(int) 50 winnstr(WINDOW *win, char *str, int n) 51 { 52 int i = 0; 53 54 T((T_CALLED("winnstr(%p,%p,%d)"), (void *) win, str, n)); 55 56 if (!win || !str) { 57 i = ERR; 58 } else { 59 int row = win->_cury; 60 int col = win->_curx; 61 NCURSES_CH_T *text = win->_line[row].text; 62 63 if (n < 0) 64 n = win->_maxx - col + 1; 65 66 for (; i < n;) { 67 #if USE_WIDEC_SUPPORT 68 cchar_t *cell = &(text[col]); 69 attr_t attrs; 70 NCURSES_PAIRS_T pair; 71 char *tmp; 72 73 if (!isWidecExt(*cell)) { 74 wchar_t *wch; 75 int n2; 76 77 n2 = getcchar(cell, 0, 0, 0, 0); 78 if (n2 > 0 79 && (wch = typeCalloc(wchar_t, (unsigned) n2 + 1)) != 0) { 80 bool done = FALSE; 81 82 if (getcchar(cell, wch, &attrs, &pair, 0) == OK) { 83 mbstate_t state; 84 size_t n3; 85 86 init_mb(state); 87 n3 = wcstombs(0, wch, (size_t) 0); 88 if (!isEILSEQ(n3) && (n3 != 0) && (n3 <= MB_LEN_MAX)) { 89 size_t need = n3 + 10 + (size_t) i; 90 int have = (int) n3 + i; 91 92 /* check for loop-done as well as overflow */ 93 if (have > n || (int) need <= 0) { 94 done = TRUE; 95 } else if ((tmp = typeCalloc(char, need)) == 0) { 96 done = TRUE; 97 } else { 98 size_t i3; 99 100 init_mb(state); 101 wcstombs(tmp, wch, n3); 102 for (i3 = 0; i3 < n3; ++i3) 103 str[i++] = tmp[i3]; 104 free(tmp); 105 } 106 } 107 } 108 free(wch); 109 if (done) 110 break; 111 } 112 } 113 #else 114 str[i++] = (char) CharOf(text[col]); 115 #endif 116 if (++col > win->_maxx) { 117 break; 118 } 119 } 120 str[i] = '\0'; /* SVr4 does not seem to count the null */ 121 } 122 T(("winnstr returns %s", _nc_visbuf(str))); 123 returnCode(i); 124 } 125