1 /* $NetBSD: db_output.c,v 1.33 2012/09/01 01:13:51 matt 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 "AS IS" 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@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 33 #ifdef _KERNEL_OPT 34 #include "opt_ddbparam.h" 35 #endif 36 37 #include <sys/cdefs.h> 38 __KERNEL_RCSID(0, "$NetBSD: db_output.c,v 1.33 2012/09/01 01:13:51 matt Exp $"); 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/stdarg.h> 43 44 #include <dev/cons.h> 45 46 #include <ddb/ddb.h> 47 48 /* 49 * Character output - tracks position in line. 50 * To do this correctly, we should know how wide 51 * the output device is - then we could zero 52 * the line position when the output device wraps 53 * around to the start of the next line. 54 * 55 * Instead, we count the number of spaces printed 56 * since the last printing character so that we 57 * don't print trailing spaces. This avoids most 58 * of the wraparounds. 59 */ 60 61 #ifndef DB_MAX_LINE 62 #define DB_MAX_LINE 24 /* maximum line */ 63 #endif /* DB_MAX_LINE */ 64 #ifndef DB_MAX_WIDTH 65 #define DB_MAX_WIDTH 80 /* maximum width */ 66 #endif /* DB_MAX_WIDTH */ 67 68 #define DB_MIN_MAX_WIDTH 20 /* minimum max width */ 69 #define DB_MIN_MAX_LINE 3 /* minimum max line */ 70 #define CTRL(c) ((c) & 0xff) 71 72 int db_output_line = 0; /* output line number */ 73 int db_tab_stop_width = 8; /* how wide are tab stops? */ 74 int db_max_line = DB_MAX_LINE; /* output max lines */ 75 int db_max_width = DB_MAX_WIDTH; /* output line width */ 76 77 static int db_output_position = 0; /* output column */ 78 static int db_last_non_space = 0; /* last non-space character */ 79 80 static void db_more(void); 81 82 /* 83 * Force pending whitespace. 84 */ 85 void 86 db_force_whitespace(void) 87 { 88 int last_print, next_tab; 89 90 last_print = db_last_non_space; 91 while (last_print < db_output_position) { 92 next_tab = DB_NEXT_TAB(last_print); 93 if (next_tab <= db_output_position) { 94 while (last_print < next_tab) { /* DON'T send a tab!! */ 95 cnputc(' '); 96 last_print++; 97 } 98 } else { 99 cnputc(' '); 100 last_print++; 101 } 102 } 103 db_last_non_space = db_output_position; 104 } 105 106 static void 107 db_more(void) 108 { 109 const char *p; 110 int quit_output = 0; 111 112 for (p = "--db_more--"; *p; p++) 113 cnputc(*p); 114 switch(cngetc()) { 115 case ' ': 116 db_output_line = 0; 117 break; 118 case 'q': 119 case CTRL('c'): 120 db_output_line = 0; 121 quit_output = 1; 122 break; 123 default: 124 db_output_line--; 125 break; 126 } 127 p = "\b\b\b\b\b\b\b\b\b\b\b \b\b\b\b\b\b\b\b\b\b\b"; 128 while (*p) 129 cnputc(*p++); 130 if (quit_output) { 131 db_error(0); 132 /* NOTREACHED */ 133 } 134 } 135 136 /* 137 * Output character. Buffer whitespace. 138 */ 139 void 140 db_putchar(int c) 141 { 142 if (db_max_line >= DB_MIN_MAX_LINE && db_output_line >= db_max_line-1) 143 db_more(); 144 if (c > ' ' && c <= '~') { 145 /* 146 * Printing character. 147 * If we have spaces to print, print them first. 148 * Use tabs if possible. 149 */ 150 db_force_whitespace(); 151 cnputc(c); 152 db_output_position++; 153 if (db_max_width >= DB_MIN_MAX_WIDTH 154 && db_output_position >= db_max_width) { 155 /* auto new line */ 156 cnputc('\n'); 157 db_output_position = 0; 158 db_last_non_space = 0; 159 db_output_line++; 160 } 161 db_last_non_space = db_output_position; 162 } else if (c == '\n') { 163 /* Return */ 164 cnputc(c); 165 db_output_position = 0; 166 db_last_non_space = 0; 167 db_output_line++; 168 db_check_interrupt(); 169 } else if (c == '\t') { 170 /* assume tabs every 8 positions */ 171 db_output_position = DB_NEXT_TAB(db_output_position); 172 } else if (c == ' ') { 173 /* space */ 174 db_output_position++; 175 } else if (c == '\007') { 176 /* bell */ 177 cnputc(c); 178 } 179 /* other characters are assumed non-printing */ 180 } 181 182 /* 183 * Return output position 184 */ 185 int 186 db_print_position(void) 187 { 188 189 return (db_output_position); 190 } 191 192 /* 193 * End line if too long. 194 */ 195 void 196 db_end_line(void) 197 { 198 199 if (db_output_position >= db_max_width) 200 db_printf("\n"); 201 } 202 203 /* 204 * Replacement for old '%r' kprintf format. 205 */ 206 void 207 db_format_radix(char *buf, size_t bufsiz, quad_t val, int altflag) 208 { 209 const char *fmt; 210 211 if (db_radix == 16) { 212 db_format_hex(buf, bufsiz, val, altflag); 213 return; 214 } 215 216 if (db_radix == 8) 217 fmt = altflag ? "-%#qo" : "-%qo"; 218 else 219 fmt = altflag ? "-%#qu" : "-%qu"; 220 221 if (val < 0) 222 val = -val; 223 else 224 ++fmt; 225 226 snprintf(buf, bufsiz, fmt, val); 227 } 228 229 /* 230 * Replacement for old '%z' kprintf format. 231 */ 232 void 233 db_format_hex(char *buf, size_t bufsiz, quad_t val, int altflag) 234 { 235 /* Only use alternate form if val is nonzero. */ 236 const char *fmt = (altflag && val) ? "-%#qx" : "-%qx"; 237 238 if (val < 0) 239 val = -val; 240 else 241 ++fmt; 242 243 snprintf(buf, bufsiz, fmt, val); 244 } 245