1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright (c) 1995-1998 by Sun Microsystems, Inc. 24 * All rights reserved. 25 */ 26 27 /* LINTLIBRARY */ 28 29 /* 30 * wget_wch.c 31 * 32 * XCurses Library 33 * 34 * Copyright 1990, 1995 by Mortice Kern Systems Inc. All rights reserved. 35 * 36 */ 37 38 #ifdef M_RCSID 39 #ifndef lint 40 static char rcsID[] = 41 "$Header: /team/ps/sun_xcurses/archive/local_changes/xcurses/src/lib/" 42 "libxcurses/src/libc/xcurses/rcs/wget_wch.c 1.7 1998/05/22 17:57:03 " 43 "cbates Exp $"; 44 #endif 45 #endif 46 47 #include <private.h> 48 #include <m_wio.h> 49 #include <stdlib.h> 50 51 /* 52 * Push a wide character back onto the input queue. 53 * 54 * XPG4 is silent as to whether wget_wch() and wgetch() 55 * can both be used in an applicaton. Assume they can, 56 * in which case we have to push the multibyte equivalent 57 * back onto the input queue. 58 */ 59 int 60 unget_wch(const wchar_t wc) 61 { 62 int i, len; 63 char mb[MB_LEN_MAX]; 64 65 if (!iqIsEmpty() || (len = wctomb(mb, wc)) < 0) 66 return (ERR); 67 68 for (i = 0; i < len; ++i) { 69 iqAdd((unsigned char)mb[i]); 70 } 71 72 return (OK); 73 } 74 75 int 76 wget_wch(WINDOW *w, wint_t *wcp) 77 { 78 cchar_t cc; 79 int ch, oecho; 80 t_wide_io *wio; 81 82 83 /* 84 * Disable echo temporarily, because we're using 85 * wgetch() to read in individual bytes and only 86 * want echo the resulting character, not the 87 * individual bytes composing the character. 88 */ 89 oecho = __m_set_echo(0); 90 91 /* 92 * Input function is wgetch(), which takes a WINDOW * for 93 * a parameter. The WINDOW * is used to set the "focus" by 94 * updatng and position the cursor in the relevant window and 95 * provide window specific settings. Input for all windows 96 * comes from one stream (__m_screen->_if), which is normally 97 * the terminal, but can be redirected. 98 */ 99 wio = (t_wide_io *) __m_screen->_in; 100 wio->object = w; 101 102 /* Get the first byte or KEY_ value. */ 103 if ((ch = wgetch(w)) == ERR) { 104 (void) __m_set_echo(oecho); 105 return (ERR); 106 } 107 if (ch < __KEY_BASE) { 108 (void) __m_set_echo(oecho); 109 if (oecho) { 110 (void) beep(); 111 return (ERR); 112 } else { 113 *wcp = ch; 114 return (KEY_CODE_YES); 115 } 116 } 117 118 /* 119 * Push the byte back onto the input stream so that 120 * it can be processed by __m_wio_get(). 121 */ 122 iqPush(ch); 123 124 /* 125 * Fetch a wide character from a narrow input stream. 126 * Invalid sequences are preserved as individual bytes. 127 * Handles insignificant and redundant shifts in the input 128 * stream. 129 */ 130 *wcp = m_wio_get(wio); 131 132 /* Restore echo. */ 133 (void) __m_set_echo(oecho); 134 135 /* 136 * Push any invalid multibyte sequence back onto the 137 * input stack, so that no data is lost, just in case 138 * the application mixes wide (wget_wch()) and narrow 139 * (wgetch()) input methods. 140 */ 141 while (wio->_next < wio->_size) 142 iqPush(wio->_mb[--wio->_size]); 143 144 /* Now echo wide character if necessary. */ 145 if ((__m_screen->_flags & S_ECHO) && *wcp != WEOF) { 146 if (*wcp == L'\b') { 147 if (w->_curx <= 0) { 148 (void) beep(); 149 return (ch); 150 } 151 w->_curx--; 152 (void) wdelch(w); 153 } else { 154 (void) __m_wc_cc(*wcp, &cc); 155 (void) wadd_wch(w, &cc); 156 } 157 (void) wrefresh(w); 158 } 159 160 return (OK); 161 } 162