Annotation of src/usr.bin/window/ttoutput.c, Revision 1.1
1.1 ! deraadt 1: /* $NetBSD: ttoutput.c,v 1.3 1995/09/28 10:34:51 tls 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. All advertising materials mentioning features or use of this software
! 19: * must display the following acknowledgement:
! 20: * This product includes software developed by the University of
! 21: * California, Berkeley and its contributors.
! 22: * 4. Neither the name of the University nor the names of its contributors
! 23: * may be used to endorse or promote products derived from this software
! 24: * without specific prior written permission.
! 25: *
! 26: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 27: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 28: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 29: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 30: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 31: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 32: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 33: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 34: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 35: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 36: * SUCH DAMAGE.
! 37: */
! 38:
! 39: #ifndef lint
! 40: #if 0
! 41: static char sccsid[] = "@(#)ttoutput.c 8.1 (Berkeley) 6/6/93";
! 42: #else
! 43: static char rcsid[] = "$NetBSD: ttoutput.c,v 1.3 1995/09/28 10:34:51 tls Exp $";
! 44: #endif
! 45: #endif /* not lint */
! 46:
! 47: #include "ww.h"
! 48: #include "tt.h"
! 49: #include <sys/errno.h>
! 50:
! 51: /*
! 52: * Buffered output package.
! 53: * We need this because stdio fails on non-blocking writes.
! 54: */
! 55:
! 56: ttflush()
! 57: {
! 58: register char *p;
! 59: register n = tt_obp - tt_ob;
! 60: extern errno;
! 61:
! 62: if (n == 0)
! 63: return;
! 64: if (tt.tt_checksum)
! 65: (*tt.tt_checksum)(tt_ob, n);
! 66: if (tt.tt_flush) {
! 67: (*tt.tt_flush)();
! 68: return;
! 69: }
! 70: wwnflush++;
! 71: for (p = tt_ob; p < tt_obp;) {
! 72: wwnwr++;
! 73: n = write(1, p, tt_obp - p);
! 74: if (n < 0) {
! 75: wwnwre++;
! 76: if (errno != EWOULDBLOCK) {
! 77: /* can't deal with this */
! 78: p = tt_obp;
! 79: }
! 80: } else if (n == 0) {
! 81: /* what to do? */
! 82: wwnwrz++;
! 83: } else {
! 84: wwnwrc += n;
! 85: p += n;
! 86: }
! 87: }
! 88: tt_obp = tt_ob;
! 89: }
! 90:
! 91: ttputs(s)
! 92: register char *s;
! 93: {
! 94: while (*s)
! 95: ttputc(*s++);
! 96: }
! 97:
! 98: ttwrite(s, n)
! 99: register char *s;
! 100: register n;
! 101: {
! 102: switch (n) {
! 103: case 0:
! 104: break;
! 105: case 1:
! 106: ttputc(*s);
! 107: break;
! 108: case 2:
! 109: if (tt_obe - tt_obp < 2)
! 110: ttflush();
! 111: *tt_obp++ = *s++;
! 112: *tt_obp++ = *s;
! 113: break;
! 114: case 3:
! 115: if (tt_obe - tt_obp < 3)
! 116: ttflush();
! 117: *tt_obp++ = *s++;
! 118: *tt_obp++ = *s++;
! 119: *tt_obp++ = *s;
! 120: break;
! 121: case 4:
! 122: if (tt_obe - tt_obp < 4)
! 123: ttflush();
! 124: *tt_obp++ = *s++;
! 125: *tt_obp++ = *s++;
! 126: *tt_obp++ = *s++;
! 127: *tt_obp++ = *s;
! 128: break;
! 129: case 5:
! 130: if (tt_obe - tt_obp < 5)
! 131: ttflush();
! 132: *tt_obp++ = *s++;
! 133: *tt_obp++ = *s++;
! 134: *tt_obp++ = *s++;
! 135: *tt_obp++ = *s++;
! 136: *tt_obp++ = *s;
! 137: break;
! 138: default:
! 139: while (n > 0) {
! 140: register m;
! 141:
! 142: while ((m = tt_obe - tt_obp) == 0)
! 143: ttflush();
! 144: if ((m = tt_obe - tt_obp) > n)
! 145: m = n;
! 146: bcopy(s, tt_obp, m);
! 147: tt_obp += m;
! 148: s += m;
! 149: n -= m;
! 150: }
! 151: }
! 152: }
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