| 1 | /* |
| 2 | * High level routines dealing with the output to the screen. |
| 3 | */ |
| 4 | |
| 5 | #include "less.h" |
| 6 | |
| 7 | public int errmsgs; /* Count of messages displayed by error() */ |
| 8 | public int need_clr; |
| 9 | |
| 10 | extern int sigs; |
| 11 | extern int sc_width; |
| 12 | extern int so_s_width, so_e_width; |
| 13 | extern int screen_trashed; |
| 14 | extern int any_display; |
| 15 | #if __MSDOS__ |
| 16 | extern int output_mode; |
| 17 | #endif |
| 18 | |
| 19 | /* |
| 20 | * Display the line which is in the line buffer. |
| 21 | */ |
| 22 | public void |
| 23 | put_line() |
| 24 | { |
| 25 | register int c; |
| 26 | register int i; |
| 27 | int a; |
| 28 | int curr_attr; |
| 29 | |
| 30 | if (sigs) |
| 31 | { |
| 32 | /* |
| 33 | * Don't output if a signal is pending. |
| 34 | */ |
| 35 | screen_trashed = 1; |
| 36 | return; |
| 37 | } |
| 38 | |
| 39 | curr_attr = NORMAL; |
| 40 | |
| 41 | for (i = 0; (c = gline(i, &a)) != '\0'; i++) |
| 42 | { |
| 43 | if (a != curr_attr) |
| 44 | { |
| 45 | /* |
| 46 | * Changing attributes. |
| 47 | * Display the exit sequence for the old attribute |
| 48 | * and the enter sequence for the new one. |
| 49 | */ |
| 50 | switch (curr_attr) |
| 51 | { |
| 52 | case UNDERLINE: ul_exit(); break; |
| 53 | case BOLD: bo_exit(); break; |
| 54 | case BLINK: bl_exit(); break; |
| 55 | } |
| 56 | switch (a) |
| 57 | { |
| 58 | case UNDERLINE: ul_enter(); break; |
| 59 | case BOLD: bo_enter(); break; |
| 60 | case BLINK: bl_enter(); break; |
| 61 | } |
| 62 | curr_attr = a; |
| 63 | } |
| 64 | if (curr_attr == INVIS) |
| 65 | continue; |
| 66 | if (c == '\b') |
| 67 | putbs(); |
| 68 | else |
| 69 | putchr(c); |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | static char obuf[1024]; |
| 74 | static char *ob = obuf; |
| 75 | |
| 76 | /* |
| 77 | * Flush buffered output. |
| 78 | * |
| 79 | * If we haven't displayed any file data yet, |
| 80 | * output messages on error output (file descriptor 2), |
| 81 | * otherwise output on standard output (file descriptor 1). |
| 82 | * |
| 83 | * This has the desirable effect of producing all |
| 84 | * error messages on error output if standard output |
| 85 | * is directed to a file. It also does the same if |
| 86 | * we never produce any real output; for example, if |
| 87 | * the input file(s) cannot be opened. If we do |
| 88 | * eventually produce output, code in edit() makes |
| 89 | * sure these messages can be seen before they are |
| 90 | * overwritten or scrolled away. |
| 91 | */ |
| 92 | public void |
| 93 | flush() |
| 94 | { |
| 95 | register int n; |
| 96 | register int fd; |
| 97 | |
| 98 | #if __MSDOS__ |
| 99 | if (output_mode == 0) |
| 100 | { |
| 101 | *ob = '\0'; |
| 102 | cputs(obuf); |
| 103 | ob = obuf; |
| 104 | return; |
| 105 | } |
| 106 | #endif |
| 107 | n = ob - obuf; |
| 108 | if (n == 0) |
| 109 | return; |
| 110 | fd = (any_display) ? 1 : 2; |
| 111 | if (write(fd, obuf, n) != n) |
| 112 | screen_trashed = 1; |
| 113 | ob = obuf; |
| 114 | } |
| 115 | |
| 116 | /* |
| 117 | * Output a character. |
| 118 | */ |
| 119 | public void |
| 120 | putchr(c) |
| 121 | int c; |
| 122 | { |
| 123 | if (ob >= &obuf[sizeof(obuf)]) |
| 124 | flush(); |
| 125 | if (need_clr) |
| 126 | { |
| 127 | need_clr = 0; |
| 128 | lower_left(); |
| 129 | clear_eol(); |
| 130 | } |
| 131 | #if __MSDOS__ |
| 132 | if (c == '\n') |
| 133 | *ob++ = '\r'; |
| 134 | #endif |
| 135 | *ob++ = c; |
| 136 | } |
| 137 | |
| 138 | /* |
| 139 | * Output a string. |
| 140 | */ |
| 141 | public void |
| 142 | putstr(s) |
| 143 | register char *s; |
| 144 | { |
| 145 | while (*s != '\0') |
| 146 | putchr(*s++); |
| 147 | } |
| 148 | |
| 149 | |
| 150 | /* |
| 151 | * Output an integer in a given radix. |
| 152 | */ |
| 153 | static int |
| 154 | iprintnum(num, radix) |
| 155 | int num; |
| 156 | int radix; |
| 157 | { |
| 158 | register char *s; |
| 159 | int r; |
| 160 | int neg; |
| 161 | char buf[10]; |
| 162 | |
| 163 | if (neg = (num < 0)) |
| 164 | num = -num; |
| 165 | |
| 166 | s = buf; |
| 167 | do |
| 168 | { |
| 169 | *s++ = (num % radix) + '0'; |
| 170 | } while ((num /= radix) != 0); |
| 171 | |
| 172 | if (neg) |
| 173 | *s++ = '-'; |
| 174 | r = s - buf; |
| 175 | |
| 176 | while (s > buf) |
| 177 | putchr(*--s); |
| 178 | return (r); |
| 179 | } |
| 180 | |
| 181 | /* |
| 182 | * This function implements printf-like functionality |
| 183 | * using a more portable argument list mechanism than printf's. |
| 184 | */ |
| 185 | static int |
| 186 | iprintf(fmt, parg) |
| 187 | register char *fmt; |
| 188 | PARG *parg; |
| 189 | { |
| 190 | register char *s; |
| 191 | register int n; |
| 192 | register int col; |
| 193 | |
| 194 | col = 0; |
| 195 | while (*fmt != '\0') |
| 196 | { |
| 197 | if (*fmt != '%') |
| 198 | { |
| 199 | putchr(*fmt++); |
| 200 | col++; |
| 201 | } else |
| 202 | { |
| 203 | ++fmt; |
| 204 | switch (*fmt++) { |
| 205 | case 's': |
| 206 | s = parg->p_string; |
| 207 | parg++; |
| 208 | while (*s != '\0') |
| 209 | { |
| 210 | putchr(*s++); |
| 211 | col++; |
| 212 | } |
| 213 | break; |
| 214 | case 'd': |
| 215 | n = parg->p_int; |
| 216 | parg++; |
| 217 | col += iprintnum(n, 10); |
| 218 | break; |
| 219 | } |
| 220 | } |
| 221 | } |
| 222 | return (col); |
| 223 | } |
| 224 | |
| 225 | /* |
| 226 | * Output a message in the lower left corner of the screen |
| 227 | * and wait for carriage return. |
| 228 | */ |
| 229 | public void |
| 230 | error(fmt, parg) |
| 231 | char *fmt; |
| 232 | PARG *parg; |
| 233 | { |
| 234 | int c; |
| 235 | int col = 0; |
| 236 | static char return_to_continue[] = " (press RETURN)"; |
| 237 | |
| 238 | errmsgs++; |
| 239 | |
| 240 | if (any_display) |
| 241 | { |
| 242 | lower_left(); |
| 243 | clear_eol(); |
| 244 | so_enter(); |
| 245 | col += so_s_width; |
| 246 | } |
| 247 | |
| 248 | col += iprintf(fmt, parg); |
| 249 | |
| 250 | if (!any_display) |
| 251 | { |
| 252 | putchr('\n'); |
| 253 | return; |
| 254 | } |
| 255 | |
| 256 | putstr(return_to_continue); |
| 257 | so_exit(); |
| 258 | col += sizeof(return_to_continue) + so_e_width; |
| 259 | |
| 260 | #if ONLY_RETURN |
| 261 | while ((c = getchr()) != '\n' && c != '\r') |
| 262 | bell(); |
| 263 | #else |
| 264 | c = getchr(); |
| 265 | if (c != '\n' && c != '\r' && c != ' ' && c != READ_INTR) |
| 266 | ungetcc(c); |
| 267 | #endif |
| 268 | lower_left(); |
| 269 | |
| 270 | if (col >= sc_width) |
| 271 | /* |
| 272 | * Printing the message has probably scrolled the screen. |
| 273 | * {{ Unless the terminal doesn't have auto margins, |
| 274 | * in which case we just hammered on the right margin. }} |
| 275 | */ |
| 276 | screen_trashed = 1; |
| 277 | |
| 278 | flush(); |
| 279 | } |
| 280 | |
| 281 | static char intr_to_abort[] = "... (interrupt to abort)"; |
| 282 | |
| 283 | /* |
| 284 | * Output a message in the lower left corner of the screen |
| 285 | * and don't wait for carriage return. |
| 286 | * Usually used to warn that we are beginning a potentially |
| 287 | * time-consuming operation. |
| 288 | */ |
| 289 | public void |
| 290 | ierror(fmt, parg) |
| 291 | char *fmt; |
| 292 | PARG *parg; |
| 293 | { |
| 294 | lower_left(); |
| 295 | clear_eol(); |
| 296 | so_enter(); |
| 297 | (void) iprintf(fmt, parg); |
| 298 | putstr(intr_to_abort); |
| 299 | so_exit(); |
| 300 | flush(); |
| 301 | need_clr = 1; |
| 302 | } |
| 303 | |
| 304 | /* |
| 305 | * Output a message in the lower left corner of the screen |
| 306 | * and return a single-character response. |
| 307 | */ |
| 308 | public int |
| 309 | query(fmt, parg) |
| 310 | char *fmt; |
| 311 | PARG *parg; |
| 312 | { |
| 313 | register int c; |
| 314 | int col = 0; |
| 315 | |
| 316 | if (any_display) |
| 317 | { |
| 318 | lower_left(); |
| 319 | clear_eol(); |
| 320 | } |
| 321 | |
| 322 | (void) iprintf(fmt, parg); |
| 323 | c = getchr(); |
| 324 | |
| 325 | if (!any_display) |
| 326 | { |
| 327 | putchr('\n'); |
| 328 | return (c); |
| 329 | } |
| 330 | |
| 331 | lower_left(); |
| 332 | if (col >= sc_width) |
| 333 | screen_trashed = 1; |
| 334 | flush(); |
| 335 | |
| 336 | return (c); |
| 337 | } |