1 /* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Edward Wang at The University of California, Berkeley. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)ttoutput.c 8.1 (Berkeley) 6/6/93 37 * $FreeBSD: src/usr.bin/window/ttoutput.c,v 1.1.1.1.14.2 2001/05/17 09:45:01 obrien Exp $ 38 * $DragonFly: src/usr.bin/window/ttoutput.c,v 1.2 2003/06/17 04:29:34 dillon Exp $ 39 */ 40 41 #include "ww.h" 42 #include "tt.h" 43 #include <errno.h> 44 45 /* 46 * Buffered output package. 47 * We need this because stdio fails on non-blocking writes. 48 */ 49 50 ttflush() 51 { 52 register char *p; 53 register n = tt_obp - tt_ob; 54 55 if (n == 0) 56 return; 57 if (tt.tt_checksum) 58 (*tt.tt_checksum)(tt_ob, n); 59 if (tt.tt_flush) { 60 (*tt.tt_flush)(); 61 return; 62 } 63 wwnflush++; 64 for (p = tt_ob; p < tt_obp;) { 65 wwnwr++; 66 n = write(1, p, tt_obp - p); 67 if (n < 0) { 68 wwnwre++; 69 if (errno != EWOULDBLOCK) { 70 /* can't deal with this */ 71 p = tt_obp; 72 } 73 } else if (n == 0) { 74 /* what to do? */ 75 wwnwrz++; 76 } else { 77 wwnwrc += n; 78 p += n; 79 } 80 } 81 tt_obp = tt_ob; 82 } 83 84 ttputs(s) 85 register char *s; 86 { 87 while (*s) 88 ttputc(*s++); 89 } 90 91 ttwrite(s, n) 92 register char *s; 93 register n; 94 { 95 switch (n) { 96 case 0: 97 break; 98 case 1: 99 ttputc(*s); 100 break; 101 case 2: 102 if (tt_obe - tt_obp < 2) 103 ttflush(); 104 *tt_obp++ = *s++; 105 *tt_obp++ = *s; 106 break; 107 case 3: 108 if (tt_obe - tt_obp < 3) 109 ttflush(); 110 *tt_obp++ = *s++; 111 *tt_obp++ = *s++; 112 *tt_obp++ = *s; 113 break; 114 case 4: 115 if (tt_obe - tt_obp < 4) 116 ttflush(); 117 *tt_obp++ = *s++; 118 *tt_obp++ = *s++; 119 *tt_obp++ = *s++; 120 *tt_obp++ = *s; 121 break; 122 case 5: 123 if (tt_obe - tt_obp < 5) 124 ttflush(); 125 *tt_obp++ = *s++; 126 *tt_obp++ = *s++; 127 *tt_obp++ = *s++; 128 *tt_obp++ = *s++; 129 *tt_obp++ = *s; 130 break; 131 default: 132 while (n > 0) { 133 register m; 134 135 while ((m = tt_obe - tt_obp) == 0) 136 ttflush(); 137 if ((m = tt_obe - tt_obp) > n) 138 m = n; 139 bcopy(s, tt_obp, m); 140 tt_obp += m; 141 s += m; 142 n -= m; 143 } 144 } 145 } 146