db_output.c revision 1.7
1 /* $NetBSD: db_output.c,v 1.7 1994/06/29 06:31:12 cgd Exp $ */ 2 3 /* 4 * Mach Operating System 5 * Copyright (c) 1991,1990 Carnegie Mellon University 6 * All Rights Reserved. 7 * 8 * Permission to use, copy, modify and distribute this software and its 9 * documentation is hereby granted, provided that both the copyright 10 * notice and this permission notice appear in all copies of the 11 * software, derivative works or modified versions, and any portions 12 * thereof, and that both notices appear in supporting documentation. 13 * 14 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS 15 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 16 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 17 * 18 * Carnegie Mellon requests users of this software to return to 19 * 20 * Software Distribution Coordinator or Software.Distribution (at) CS.CMU.EDU 21 * School of Computer Science 22 * Carnegie Mellon University 23 * Pittsburgh PA 15213-3890 24 * 25 * any improvements or extensions that they make and grant Carnegie the 26 * rights to redistribute these changes. 27 */ 28 29 /* 30 * Printf and character output for debugger. 31 */ 32 #include <sys/param.h> 33 34 #include <machine/stdarg.h> 35 36 /* 37 * Character output - tracks position in line. 38 * To do this correctly, we should know how wide 39 * the output device is - then we could zero 40 * the line position when the output device wraps 41 * around to the start of the next line. 42 * 43 * Instead, we count the number of spaces printed 44 * since the last printing character so that we 45 * don't print trailing spaces. This avoids most 46 * of the wraparounds. 47 */ 48 49 #ifndef DB_MAX_LINE 50 #define DB_MAX_LINE 24 /* maximum line */ 51 #define DB_MAX_WIDTH 80 /* maximum width */ 52 #endif DB_MAX_LINE 53 54 #define DB_MIN_MAX_WIDTH 20 /* minimum max width */ 55 #define DB_MIN_MAX_LINE 3 /* minimum max line */ 56 #define CTRL(c) ((c) & 0xff) 57 58 int db_output_position = 0; /* output column */ 59 int db_output_line = 0; /* output line number */ 60 int db_last_non_space = 0; /* last non-space character */ 61 int db_tab_stop_width = 8; /* how wide are tab stops? */ 62 #define NEXT_TAB(i) \ 63 ((((i) + db_tab_stop_width) / db_tab_stop_width) * db_tab_stop_width) 64 int db_max_line = DB_MAX_LINE; /* output max lines */ 65 int db_max_width = DB_MAX_WIDTH; /* output line width */ 66 67 extern void db_check_interrupt(); 68 69 /* 70 * Force pending whitespace. 71 */ 72 void 73 db_force_whitespace() 74 { 75 register int last_print, next_tab; 76 77 last_print = db_last_non_space; 78 while (last_print < db_output_position) { 79 next_tab = NEXT_TAB(last_print); 80 if (next_tab <= db_output_position) { 81 while (last_print < next_tab) { /* DON'T send a tab!!! */ 82 cnputc(' '); 83 last_print++; 84 } 85 } 86 else { 87 cnputc(' '); 88 last_print++; 89 } 90 } 91 db_last_non_space = db_output_position; 92 } 93 94 static void 95 db_more() 96 { 97 register char *p; 98 int quit_output = 0; 99 100 for (p = "--db_more--"; *p; p++) 101 cnputc(*p); 102 switch(cngetc()) { 103 case ' ': 104 db_output_line = 0; 105 break; 106 case 'q': 107 case CTRL('c'): 108 db_output_line = 0; 109 quit_output = 1; 110 break; 111 default: 112 db_output_line--; 113 break; 114 } 115 p = "\b\b\b\b\b\b\b\b\b\b\b \b\b\b\b\b\b\b\b\b\b\b"; 116 while (*p) 117 cnputc(*p++); 118 if (quit_output) { 119 db_error(0); 120 /* NOTREACHED */ 121 } 122 } 123 124 /* 125 * Output character. Buffer whitespace. 126 */ 127 db_putchar(c) 128 int c; /* character to output */ 129 { 130 if (db_max_line >= DB_MIN_MAX_LINE && db_output_line >= db_max_line-1) 131 db_more(); 132 if (c > ' ' && c <= '~') { 133 /* 134 * Printing character. 135 * If we have spaces to print, print them first. 136 * Use tabs if possible. 137 */ 138 db_force_whitespace(); 139 cnputc(c); 140 db_output_position++; 141 if (db_max_width >= DB_MIN_MAX_WIDTH 142 && db_output_position >= db_max_width-1) { 143 /* auto new line */ 144 cnputc('\n'); 145 db_output_position = 0; 146 db_last_non_space = 0; 147 db_output_line++; 148 } 149 db_last_non_space = db_output_position; 150 } 151 else if (c == '\n') { 152 /* Return */ 153 cnputc(c); 154 db_output_position = 0; 155 db_last_non_space = 0; 156 db_output_line++; 157 db_check_interrupt(); 158 } 159 else if (c == '\t') { 160 /* assume tabs every 8 positions */ 161 db_output_position = NEXT_TAB(db_output_position); 162 } 163 else if (c == ' ') { 164 /* space */ 165 db_output_position++; 166 } 167 else if (c == '\007') { 168 /* bell */ 169 cnputc(c); 170 } 171 /* other characters are assumed non-printing */ 172 } 173 174 /* 175 * Return output position 176 */ 177 int 178 db_print_position() 179 { 180 return (db_output_position); 181 } 182 183 /* 184 * Printing 185 */ 186 extern int db_radix; 187 188 /*VARARGS1*/ 189 db_printf(char *fmt, ...) 190 { 191 va_list listp; 192 va_start(listp, fmt); 193 db_printf_guts (fmt, listp); 194 va_end(listp); 195 } 196 197 /* alternate name */ 198 199 /*VARARGS1*/ 200 kdbprintf(char *fmt, ...) 201 { 202 va_list listp; 203 va_start(listp, fmt); 204 db_printf_guts (fmt, listp); 205 va_end(listp); 206 } 207 208 /* 209 * End line if too long. 210 */ 211 void 212 db_end_line() 213 { 214 if (db_output_position >= db_max_width) 215 db_printf("\n"); 216 } 217 218 /* 219 * Put a number (base <= 16) in a buffer in reverse order; return an 220 * optional length and a pointer to the NULL terminated (preceded?) 221 * buffer. 222 */ 223 static char * 224 db_ksprintn(ul, base, lenp) 225 register u_long ul; 226 register int base, *lenp; 227 { /* A long in base 8, plus NULL. */ 228 static char buf[sizeof(long) * NBBY / 3 + 2]; 229 register char *p; 230 231 p = buf; 232 do { 233 *++p = "0123456789abcdef"[ul % base]; 234 } while (ul /= base); 235 if (lenp) 236 *lenp = p - buf; 237 return (p); 238 } 239 240 db_printf_guts(fmt, ap) 241 register const char *fmt; 242 va_list ap; 243 { 244 register char *p; 245 register int ch, n; 246 u_long ul; 247 int base, lflag, tmp, width; 248 char padc; 249 int ladjust; 250 int sharpflag; 251 int neg; 252 253 for (;;) { 254 padc = ' '; 255 width = 0; 256 while ((ch = *(u_char *)fmt++) != '%') { 257 if (ch == '\0') 258 return; 259 db_putchar(ch); 260 } 261 lflag = 0; 262 ladjust = 0; 263 sharpflag = 0; 264 neg = 0; 265 reswitch: switch (ch = *(u_char *)fmt++) { 266 case '0': 267 padc = '0'; 268 goto reswitch; 269 case '1': case '2': case '3': case '4': 270 case '5': case '6': case '7': case '8': case '9': 271 for (width = 0;; ++fmt) { 272 width = width * 10 + ch - '0'; 273 ch = *fmt; 274 if (ch < '0' || ch > '9') 275 break; 276 } 277 goto reswitch; 278 case 'l': 279 lflag = 1; 280 goto reswitch; 281 case '-': 282 ladjust = 1; 283 goto reswitch; 284 case '#': 285 sharpflag = 1; 286 goto reswitch; 287 case 'b': 288 ul = va_arg(ap, int); 289 p = va_arg(ap, char *); 290 for (p = db_ksprintn(ul, *p++, NULL); ch = *p--;) 291 db_putchar(ch); 292 293 if (!ul) 294 break; 295 296 for (tmp = 0; n = *p++;) { 297 if (ul & (1 << (n - 1))) { 298 db_putchar(tmp ? ',' : '<'); 299 for (; (n = *p) > ' '; ++p) 300 db_putchar(n); 301 tmp = 1; 302 } else 303 for (; *p > ' '; ++p); 304 } 305 if (tmp) 306 db_putchar('>'); 307 break; 308 case '*': 309 width = va_arg (ap, int); 310 if (width < 0) { 311 ladjust = !ladjust; 312 width = -width; 313 } 314 goto reswitch; 315 case 'c': 316 db_putchar(va_arg(ap, int)); 317 break; 318 case 's': 319 p = va_arg(ap, char *); 320 width -= strlen (p); 321 if (!ladjust && width > 0) 322 while (width--) 323 db_putchar (padc); 324 while (ch = *p++) 325 db_putchar(ch); 326 if (ladjust && width > 0) 327 while (width--) 328 db_putchar (padc); 329 break; 330 case 'r': 331 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 332 if ((long)ul < 0) { 333 neg = 1; 334 ul = -(long)ul; 335 } 336 base = db_radix; 337 if (base < 8 || base > 16) 338 base = 10; 339 goto number; 340 case 'n': 341 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 342 base = db_radix; 343 if (base < 8 || base > 16) 344 base = 10; 345 goto number; 346 case 'd': 347 ul = lflag ? va_arg(ap, long) : va_arg(ap, int); 348 if ((long)ul < 0) { 349 neg = 1; 350 ul = -(long)ul; 351 } 352 base = 10; 353 goto number; 354 case 'o': 355 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 356 base = 8; 357 goto number; 358 case 'u': 359 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 360 base = 10; 361 goto number; 362 case 'z': 363 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 364 if ((long)ul < 0) { 365 neg = 1; 366 ul = -(long)ul; 367 } 368 base = 16; 369 goto number; 370 case 'x': 371 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 372 base = 16; 373 number: p = (char *)db_ksprintn(ul, base, &tmp); 374 if (sharpflag && ul != 0) { 375 if (base == 8) 376 tmp++; 377 else if (base == 16) 378 tmp += 2; 379 } 380 if (neg) 381 tmp++; 382 383 if (!ladjust && width && (width -= tmp) > 0) 384 while (width--) 385 db_putchar(padc); 386 if (neg) 387 db_putchar ('-'); 388 if (sharpflag && ul != 0) { 389 if (base == 8) { 390 db_putchar ('0'); 391 } else if (base == 16) { 392 db_putchar ('0'); 393 db_putchar ('x'); 394 } 395 } 396 if (ladjust && width && (width -= tmp) > 0) 397 while (width--) 398 db_putchar(padc); 399 400 while (ch = *p--) 401 db_putchar(ch); 402 break; 403 default: 404 db_putchar('%'); 405 if (lflag) 406 db_putchar('l'); 407 /* FALLTHROUGH */ 408 case '%': 409 db_putchar(ch); 410 } 411 } 412 } 413 414
Indexes created Wed Sep 24 05:09:52 GMT 2025