1 /**************************************************************************** 2 * Copyright 2020 Thomas E. Dickey * 3 * Copyright 1998-2016,2017 Free Software Foundation, Inc. * 4 * * 5 * Permission is hereby granted, free of charge, to any person obtaining a * 6 * copy of this software and associated documentation files (the * 7 * "Software"), to deal in the Software without restriction, including * 8 * without limitation the rights to use, copy, modify, merge, publish, * 9 * distribute, distribute with modifications, sublicense, and/or sell * 10 * copies of the Software, and to permit persons to whom the Software is * 11 * furnished to do so, subject to the following conditions: * 12 * * 13 * The above copyright notice and this permission notice shall be included * 14 * in all copies or substantial portions of the Software. * 15 * * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * 17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * 18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * 19 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * 20 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * 21 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * 22 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * 23 * * 24 * Except as contained in this notice, the name(s) of the above copyright * 25 * holders shall not be used in advertising or otherwise to promote the * 26 * sale, use or other dealings in this Software without prior written * 27 * authorization. * 28 ****************************************************************************/ 29 30 /**************************************************************************** 31 * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 * 32 * and: Eric S. Raymond <esr@snark.thyrsus.com> * 33 * and: Thomas E. Dickey 1996-on * 34 ****************************************************************************/ 35 36 /* 37 ** lib_instr.c 38 ** 39 ** The routine winnstr(). 40 ** 41 */ 42 43 #include <curses.priv.h> 44 45 MODULE_ID("$Id: lib_instr.c,v 1.24 2020/02/02 23:34:34 tom Exp $") 46 47 NCURSES_EXPORT(int) 48 winnstr(WINDOW *win, char *str, int n) 49 { 50 int i = 0; 51 52 T((T_CALLED("winnstr(%p,%p,%d)"), (void *) win, str, n)); 53 54 if (!win || !str) { 55 i = ERR; 56 } else { 57 int row = win->_cury; 58 int col = win->_curx; 59 NCURSES_CH_T *text = win->_line[row].text; 60 61 if (n < 0) 62 n = win->_maxx - col + 1; 63 64 for (; i < n;) { 65 #if USE_WIDEC_SUPPORT 66 cchar_t *cell = &(text[col]); 67 attr_t attrs; 68 NCURSES_PAIRS_T pair; 69 mbstate_t state; 70 char *tmp; 71 72 if (!isWidecExt(*cell)) { 73 wchar_t *wch; 74 int n2; 75 76 n2 = getcchar(cell, 0, 0, 0, 0); 77 if (n2 > 0 78 && (wch = typeCalloc(wchar_t, (unsigned) n2 + 1)) != 0) { 79 bool done = FALSE; 80 81 if (getcchar(cell, wch, &attrs, &pair, 0) == OK) { 82 size_t n3; 83 84 init_mb(state); 85 n3 = wcstombs(0, wch, (size_t) 0); 86 if (!isEILSEQ(n3) && (n3 != 0)) { 87 size_t need = n3 + 10 + (size_t) i; 88 int have = (int) n3 + i; 89 90 /* check for loop-done as well as overflow */ 91 if (have > n || (int) need <= 0) { 92 done = TRUE; 93 } else if ((tmp = typeCalloc(char, need)) == 0) { 94 done = TRUE; 95 } else { 96 size_t i3; 97 98 init_mb(state); 99 wcstombs(tmp, wch, n3); 100 for (i3 = 0; i3 < n3; ++i3) 101 str[i++] = tmp[i3]; 102 free(tmp); 103 } 104 } 105 } 106 free(wch); 107 if (done) 108 break; 109 } 110 } 111 #else 112 str[i++] = (char) CharOf(text[col]); 113 #endif 114 if (++col > win->_maxx) { 115 break; 116 } 117 } 118 str[i] = '\0'; /* SVr4 does not seem to count the null */ 119 } 120 T(("winnstr returns %s", _nc_visbuf(str))); 121 returnCode(i); 122 } 123