output.c revision 1.6
1 /* $NetBSD: output.c,v 1.6 2003/08/07 09:28:00 agc Exp $ */ 2 3 /* 4 * Copyright (c) 1988, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 1988 Mark Nudleman 34 * 35 * Redistribution and use in source and binary forms, with or without 36 * modification, are permitted provided that the following conditions 37 * are met: 38 * 1. Redistributions of source code must retain the above copyright 39 * notice, this list of conditions and the following disclaimer. 40 * 2. Redistributions in binary form must reproduce the above copyright 41 * notice, this list of conditions and the following disclaimer in the 42 * documentation and/or other materials provided with the distribution. 43 * 3. All advertising materials mentioning features or use of this software 44 * must display the following acknowledgement: 45 * This product includes software developed by the University of 46 * California, Berkeley and its contributors. 47 * 4. Neither the name of the University nor the names of its contributors 48 * may be used to endorse or promote products derived from this software 49 * without specific prior written permission. 50 * 51 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 52 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 53 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 54 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 55 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 56 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 57 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 58 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 59 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 60 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 61 * SUCH DAMAGE. 62 */ 63 64 #include <sys/cdefs.h> 65 #ifndef lint 66 #if 0 67 static char sccsid[] = "@(#)output.c 8.2 (Berkeley) 4/27/95"; 68 #else 69 __RCSID("$NetBSD: output.c,v 1.6 2003/08/07 09:28:00 agc Exp $"); 70 #endif 71 #endif /* not lint */ 72 73 /* 74 * High level routines dealing with the output to the screen. 75 */ 76 77 #include <stdio.h> 78 #include <string.h> 79 #include <unistd.h> 80 #include <stdlib.h> 81 82 #include "less.h" 83 #include "extern.h" 84 85 int errmsgs; /* Count of messages displayed by error() */ 86 87 /* display the line which is in the line buffer. */ 88 void 89 put_line() 90 { 91 char *p; 92 int c; 93 int column; 94 95 if (sigs) 96 { 97 /* 98 * Don't output if a signal is pending. 99 */ 100 screen_trashed = 1; 101 return; 102 } 103 104 if (line == NULL) 105 line = ""; 106 107 column = 0; 108 for (p = line; *p != '\0'; p++) 109 { 110 switch (c = *p) 111 { 112 case UL_CHAR: 113 ul_enter(); 114 column += ul_width +1; 115 break; 116 case UE_CHAR: 117 ul_exit(); 118 column += ue_width; 119 break; 120 case BO_CHAR: 121 bo_enter(); 122 column += bo_width +1; 123 break; 124 case BE_CHAR: 125 bo_exit(); 126 column += be_width; 127 break; 128 case '\t': 129 do 130 { 131 putchr(' '); 132 column++; 133 } while ((column % tabstop) != 0); 134 break; 135 case '\b': 136 putbs(); 137 column--; 138 break; 139 default: 140 if (c & 0200) 141 { 142 /* 143 * Control characters arrive here as the 144 * normal character [CARAT_CHAR(c)] with 145 * the 0200 bit set. See pappend(). 146 */ 147 putchr('^'); 148 putchr(c & 0177); 149 column += 2; 150 } else 151 { 152 putchr(c); 153 column++; 154 } 155 } 156 } 157 if (column < sc_width || !auto_wrap || ignaw) 158 putchr('\n'); 159 } 160 161 static char obuf[1024]; 162 static char *ob = obuf; 163 164 /* 165 * Flush buffered output. 166 */ 167 void 168 flush() 169 { 170 int n; 171 172 n = ob - obuf; 173 if (n == 0) 174 return; 175 if (write(1, obuf, n) != n) 176 screen_trashed = 1; 177 ob = obuf; 178 } 179 180 /* 181 * Purge any pending output. 182 */ 183 void 184 purge() 185 { 186 187 ob = obuf; 188 } 189 190 /* 191 * Output a character. 192 */ 193 int 194 putchr(c) 195 int c; 196 { 197 if (ob >= &obuf[sizeof(obuf)]) 198 flush(); 199 *ob++ = c; 200 } 201 202 /* 203 * Output a string. 204 */ 205 void 206 putstr(s) 207 char *s; 208 { 209 while (*s != '\0') 210 putchr(*s++); 211 } 212 213 int cmdstack; 214 static char return_to_continue[] = "(press RETURN)"; 215 216 /* 217 * Output a message in the lower left corner of the screen 218 * and wait for carriage return. 219 */ 220 void 221 error(s) 222 char *s; 223 { 224 int ch; 225 226 ++errmsgs; 227 if (!any_display) { 228 /* 229 * Nothing has been displayed yet. Output this message on 230 * error output (file descriptor 2) and don't wait for a 231 * keystroke to continue. 232 * 233 * This has the desirable effect of producing all error 234 * messages on error output if standard output is directed 235 * to a file. It also does the same if we never produce 236 * any real output; for example, if the input file(s) cannot 237 * be opened. If we do eventually produce output, code in 238 * edit() makes sure these messages can be seen before they 239 * are overwritten or scrolled away. 240 */ 241 if (s != NULL) { 242 (void)write(2, s, strlen(s)); 243 (void)write(2, "\n", 1); 244 } 245 return; 246 } 247 248 lower_left(); 249 clear_eol(); 250 so_enter(); 251 if (s != NULL) { 252 putstr(s); 253 putstr(" "); 254 } 255 putstr(return_to_continue); 256 so_exit(); 257 258 if ((ch = getchr()) != '\n') { 259 if (ch == 'q') 260 quit(); 261 cmdstack = ch; 262 } 263 lower_left(); 264 265 if ((s != NULL ? strlen(s) : 0) + sizeof(return_to_continue) + 266 so_width + se_width + 1 > sc_width) 267 /* 268 * Printing the message has probably scrolled the screen. 269 * {{ Unless the terminal doesn't have auto margins, 270 * in which case we just hammered on the right margin. }} 271 */ 272 repaint(); 273 flush(); 274 } 275 276 static char intr_to_abort[] = "... (interrupt to abort)"; 277 278 void 279 ierror(s) 280 char *s; 281 { 282 lower_left(); 283 clear_eol(); 284 so_enter(); 285 putstr(s); 286 putstr(intr_to_abort); 287 so_exit(); 288 flush(); 289 } 290
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