1 /* 2 * Mach Operating System 3 * Copyright (c) 1991,1990 Carnegie Mellon University 4 * All Rights Reserved. 5 * 6 * Permission to use, copy, modify and distribute this software and its 7 * documentation is hereby granted, provided that both the copyright 8 * notice and this permission notice appear in all copies of the 9 * software, derivative works or modified versions, and any portions 10 * thereof, and that both notices appear in supporting documentation. 11 * 12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS 13 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 15 * 16 * Carnegie Mellon requests users of this software to return to 17 * 18 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 19 * School of Computer Science 20 * Carnegie Mellon University 21 * Pittsburgh PA 15213-3890 22 * 23 * any improvements or extensions that they make and grant Carnegie the 24 * rights to redistribute these changes. 25 * 26 * $Id: db_output.c,v 1.6 1993/12/19 00:49:45 wollman Exp $ 27 */ 28 29 /* 30 * Author: David B. Golub, Carnegie Mellon University 31 * Date: 7/90 32 */ 33 34 /* 35 * Printf and character output for debugger. 36 */ 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <machine/stdarg.h> 41 #include <ddb/ddb.h> 42 #include <machine/cons.h> 43 44 /* 45 * Character output - tracks position in line. 46 * To do this correctly, we should know how wide 47 * the output device is - then we could zero 48 * the line position when the output device wraps 49 * around to the start of the next line. 50 * 51 * Instead, we count the number of spaces printed 52 * since the last printing character so that we 53 * don't print trailing spaces. This avoids most 54 * of the wraparounds. 55 */ 56 int db_output_position = 0; /* output column */ 57 int db_last_non_space = 0; /* last non-space character */ 58 int db_tab_stop_width = 8; /* how wide are tab stops? */ 59 #define NEXT_TAB(i) \ 60 ((((i) + db_tab_stop_width) / db_tab_stop_width) * db_tab_stop_width) 61 int db_max_width = 80; /* output line width */ 62 63 64 static void db_printf_guts(const char *, va_list); 65 66 /* 67 * Force pending whitespace. 68 */ 69 void 70 db_force_whitespace() 71 { 72 register int last_print, next_tab; 73 74 last_print = db_last_non_space; 75 while (last_print < db_output_position) { 76 next_tab = NEXT_TAB(last_print); 77 if (next_tab <= db_output_position) { 78 while (last_print < next_tab) { /* DON'T send a tab!!! */ 79 cnputc(' '); 80 last_print++; 81 } 82 } 83 else { 84 cnputc(' '); 85 last_print++; 86 } 87 } 88 db_last_non_space = db_output_position; 89 } 90 91 /* 92 * Output character. Buffer whitespace. 93 */ 94 void 95 db_putchar(c) 96 int c; /* character to output */ 97 { 98 if (c > ' ' && c <= '~') { 99 /* 100 * Printing character. 101 * If we have spaces to print, print them first. 102 * Use tabs if possible. 103 */ 104 db_force_whitespace(); 105 cnputc(c); 106 db_output_position++; 107 db_last_non_space = db_output_position; 108 } 109 else if (c == '\n') { 110 /* Return */ 111 cnputc(c); 112 db_output_position = 0; 113 db_last_non_space = 0; 114 db_check_interrupt(); 115 } 116 else if (c == '\t') { 117 /* assume tabs every 8 positions */ 118 db_output_position = NEXT_TAB(db_output_position); 119 } 120 else if (c == ' ') { 121 /* space */ 122 db_output_position++; 123 } 124 else if (c == '\007') { 125 /* bell */ 126 cnputc(c); 127 } 128 /* other characters are assumed non-printing */ 129 } 130 131 /* 132 * Return output position 133 */ 134 int 135 db_print_position() 136 { 137 return (db_output_position); 138 } 139 140 /* 141 * Printing 142 */ 143 void 144 db_printf(const char *fmt, ...) 145 { 146 va_list listp; 147 va_start(listp, fmt); 148 db_printf_guts (fmt, listp); 149 va_end(listp); 150 } 151 152 /* alternate name */ 153 154 /*VARARGS1*/ 155 void 156 kdbprintf(char *fmt, ...) 157 { 158 va_list listp; 159 va_start(listp, fmt); 160 db_printf_guts (fmt, listp); 161 va_end(listp); 162 } 163 164 /* 165 * End line if too long. 166 */ 167 void 168 db_end_line() 169 { 170 if (db_output_position >= db_max_width) 171 db_printf("\n"); 172 } 173 174 /* 175 * Put a number (base <= 16) in a buffer in reverse order; return an 176 * optional length and a pointer to the NULL terminated (preceded?) 177 * buffer. 178 */ 179 static char * 180 db_ksprintn(ul, base, lenp) 181 register u_long ul; 182 register int base, *lenp; 183 { /* A long in base 8, plus NULL. */ 184 static char buf[sizeof(long) * NBBY / 3 + 2]; 185 register char *p; 186 187 p = buf; 188 do { 189 *++p = "0123456789abcdef"[ul % base]; 190 } while (ul /= base); 191 if (lenp) 192 *lenp = p - buf; 193 return (p); 194 } 195 196 static void 197 db_printf_guts(fmt, ap) 198 register const char *fmt; 199 va_list ap; 200 { 201 register char *p; 202 register int ch, n; 203 u_long ul; 204 int base, lflag, tmp, width; 205 char padc; 206 int ladjust; 207 int sharpflag; 208 int neg; 209 210 for (;;) { 211 padc = ' '; 212 width = 0; 213 while ((ch = *(u_char *)fmt++) != '%') { 214 if (ch == '\0') 215 return; 216 db_putchar(ch); 217 } 218 lflag = 0; 219 ladjust = 0; 220 sharpflag = 0; 221 neg = 0; 222 reswitch: switch (ch = *(u_char *)fmt++) { 223 case '0': 224 padc = '0'; 225 goto reswitch; 226 case '1': case '2': case '3': case '4': 227 case '5': case '6': case '7': case '8': case '9': 228 for (width = 0;; ++fmt) { 229 width = width * 10 + ch - '0'; 230 ch = *fmt; 231 if (ch < '0' || ch > '9') 232 break; 233 } 234 goto reswitch; 235 case 'l': 236 lflag = 1; 237 goto reswitch; 238 case '-': 239 ladjust = 1; 240 goto reswitch; 241 case '#': 242 sharpflag = 1; 243 goto reswitch; 244 case 'b': 245 ul = va_arg(ap, int); 246 p = va_arg(ap, char *); 247 for (p = db_ksprintn(ul, *p++, NULL); ch = *p--;) 248 db_putchar(ch); 249 250 if (!ul) 251 break; 252 253 for (tmp = 0; n = *p++;) { 254 if (ul & (1 << (n - 1))) { 255 db_putchar(tmp ? ',' : '<'); 256 for (; (n = *p) > ' '; ++p) 257 db_putchar(n); 258 tmp = 1; 259 } else 260 for (; *p > ' '; ++p); 261 } 262 if (tmp) 263 db_putchar('>'); 264 break; 265 case '*': 266 width = va_arg (ap, int); 267 if (width < 0) { 268 ladjust = !ladjust; 269 width = -width; 270 } 271 goto reswitch; 272 case 'c': 273 db_putchar(va_arg(ap, int)); 274 break; 275 case 's': 276 p = va_arg(ap, char *); 277 width -= strlen (p); 278 if (!ladjust && width > 0) 279 while (width--) 280 db_putchar (padc); 281 while (ch = *p++) 282 db_putchar(ch); 283 if (ladjust && width > 0) 284 while (width--) 285 db_putchar (padc); 286 break; 287 case 'r': 288 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 289 if ((long)ul < 0) { 290 neg = 1; 291 ul = -(long)ul; 292 } 293 base = db_radix; 294 if (base < 8 || base > 16) 295 base = 10; 296 goto number; 297 case 'n': 298 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 299 base = db_radix; 300 if (base < 8 || base > 16) 301 base = 10; 302 goto number; 303 case 'd': 304 ul = lflag ? va_arg(ap, long) : va_arg(ap, int); 305 if ((long)ul < 0) { 306 neg = 1; 307 ul = -(long)ul; 308 } 309 base = 10; 310 goto number; 311 case 'o': 312 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 313 base = 8; 314 goto number; 315 case 'u': 316 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 317 base = 10; 318 goto number; 319 case 'z': 320 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 321 if ((long)ul < 0) { 322 neg = 1; 323 ul = -(long)ul; 324 } 325 base = 16; 326 goto number; 327 case 'x': 328 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 329 base = 16; 330 number: p = (char *)db_ksprintn(ul, base, &tmp); 331 if (sharpflag && ul != 0) { 332 if (base == 8) 333 tmp++; 334 else if (base == 16) 335 tmp += 2; 336 } 337 if (neg) 338 tmp++; 339 340 if (!ladjust && width && (width -= tmp) > 0) 341 while (width--) 342 db_putchar(padc); 343 if (neg) 344 db_putchar ('-'); 345 if (sharpflag && ul != 0) { 346 if (base == 8) { 347 db_putchar ('0'); 348 } else if (base == 16) { 349 db_putchar ('0'); 350 db_putchar ('x'); 351 } 352 } 353 if (ladjust && width && (width -= tmp) > 0) 354 while (width--) 355 db_putchar(padc); 356 357 while (ch = *p--) 358 db_putchar(ch); 359 break; 360 default: 361 db_putchar('%'); 362 if (lflag) 363 db_putchar('l'); 364 /* FALLTHROUGH */ 365 case '%': 366 db_putchar(ch); 367 } 368 } 369 } 370 371