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 <errno.h> 42 #include <string.h> 43 44 #include "ww.h" 45 #include "tt.h" 46 47 /* 48 * Buffered output package. 49 * We need this because stdio fails on non-blocking writes. 50 */ 51 52 ttflush() 53 { 54 register char *p; 55 register n = tt_obp - tt_ob; 56 57 if (n == 0) 58 return; 59 if (tt.tt_checksum) 60 (*tt.tt_checksum)(tt_ob, n); 61 if (tt.tt_flush) { 62 (*tt.tt_flush)(); 63 return; 64 } 65 wwnflush++; 66 for (p = tt_ob; p < tt_obp;) { 67 wwnwr++; 68 n = write(1, p, tt_obp - p); 69 if (n < 0) { 70 wwnwre++; 71 if (errno != EWOULDBLOCK) { 72 /* can't deal with this */ 73 p = tt_obp; 74 } 75 } else if (n == 0) { 76 /* what to do? */ 77 wwnwrz++; 78 } else { 79 wwnwrc += n; 80 p += n; 81 } 82 } 83 tt_obp = tt_ob; 84 } 85 86 ttputs(s) 87 register char *s; 88 { 89 while (*s) 90 ttputc(*s++); 91 } 92 93 ttwrite(s, n) 94 register char *s; 95 register n; 96 { 97 switch (n) { 98 case 0: 99 break; 100 case 1: 101 ttputc(*s); 102 break; 103 case 2: 104 if (tt_obe - tt_obp < 2) 105 ttflush(); 106 *tt_obp++ = *s++; 107 *tt_obp++ = *s; 108 break; 109 case 3: 110 if (tt_obe - tt_obp < 3) 111 ttflush(); 112 *tt_obp++ = *s++; 113 *tt_obp++ = *s++; 114 *tt_obp++ = *s; 115 break; 116 case 4: 117 if (tt_obe - tt_obp < 4) 118 ttflush(); 119 *tt_obp++ = *s++; 120 *tt_obp++ = *s++; 121 *tt_obp++ = *s++; 122 *tt_obp++ = *s; 123 break; 124 case 5: 125 if (tt_obe - tt_obp < 5) 126 ttflush(); 127 *tt_obp++ = *s++; 128 *tt_obp++ = *s++; 129 *tt_obp++ = *s++; 130 *tt_obp++ = *s++; 131 *tt_obp++ = *s; 132 break; 133 default: 134 while (n > 0) { 135 register m; 136 137 while ((m = tt_obe - tt_obp) == 0) 138 ttflush(); 139 if ((m = tt_obe - tt_obp) > n) 140 m = n; 141 bcopy(s, tt_obp, m); 142 tt_obp += m; 143 s += m; 144 n -= m; 145 } 146 } 147 } 148