1 /* $NetBSD: ttoutput.c,v 1.9 2009/04/14 08:50:06 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Edward Wang at The University of California, Berkeley. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)ttoutput.c 8.1 (Berkeley) 6/6/93"; 39 #else 40 __RCSID("$NetBSD: ttoutput.c,v 1.9 2009/04/14 08:50:06 lukem Exp $"); 41 #endif 42 #endif /* not lint */ 43 44 #include <errno.h> 45 #include <string.h> 46 #include <unistd.h> 47 #include "ww.h" 48 #include "tt.h" 49 50 /* 51 * Buffered output package. 52 * We need this because stdio fails on non-blocking writes. 53 */ 54 55 void 56 ttflush(void) 57 { 58 char *p; 59 int n = tt_obp - tt_ob; 60 61 if (n == 0) 62 return; 63 if (tt.tt_checksum) 64 (*tt.tt_checksum)(tt_ob, n); 65 if (tt.tt_flush) { 66 (*tt.tt_flush)(); 67 return; 68 } 69 wwnflush++; 70 for (p = tt_ob; p < tt_obp;) { 71 wwnwr++; 72 n = write(1, p, tt_obp - p); 73 if (n < 0) { 74 wwnwre++; 75 if (errno != EWOULDBLOCK) { 76 /* can't deal with this */ 77 p = tt_obp; 78 } 79 } else if (n == 0) { 80 /* what to do? */ 81 wwnwrz++; 82 } else { 83 wwnwrc += n; 84 p += n; 85 } 86 } 87 tt_obp = tt_ob; 88 } 89 90 void 91 ttputs(const char *s) 92 { 93 while (*s) 94 ttputc(*s++); 95 } 96 97 void 98 ttwrite(const char *s, int n) 99 { 100 switch (n) { 101 case 0: 102 break; 103 case 1: 104 ttputc(*s); 105 break; 106 case 2: 107 if (tt_obe - tt_obp < 2) 108 ttflush(); 109 *tt_obp++ = *s++; 110 *tt_obp++ = *s; 111 break; 112 case 3: 113 if (tt_obe - tt_obp < 3) 114 ttflush(); 115 *tt_obp++ = *s++; 116 *tt_obp++ = *s++; 117 *tt_obp++ = *s; 118 break; 119 case 4: 120 if (tt_obe - tt_obp < 4) 121 ttflush(); 122 *tt_obp++ = *s++; 123 *tt_obp++ = *s++; 124 *tt_obp++ = *s++; 125 *tt_obp++ = *s; 126 break; 127 case 5: 128 if (tt_obe - tt_obp < 5) 129 ttflush(); 130 *tt_obp++ = *s++; 131 *tt_obp++ = *s++; 132 *tt_obp++ = *s++; 133 *tt_obp++ = *s++; 134 *tt_obp++ = *s; 135 break; 136 default: 137 while (n > 0) { 138 int m; 139 140 while ((m = tt_obe - tt_obp) == 0) 141 ttflush(); 142 if ((m = tt_obe - tt_obp) > n) 143 m = n; 144 memmove(tt_obp, s, m); 145 tt_obp += m; 146 s += m; 147 n -= m; 148 } 149 } 150 } 151