1 /* $NetBSD: db_output.c,v 1.27 2002/02/15 07:33:51 simonb 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 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: db_output.c,v 1.27 2002/02/15 07:33:51 simonb Exp $"); 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 39 #include <machine/stdarg.h> 40 41 #include <dev/cons.h> 42 43 #include <machine/db_machdep.h> 44 45 #include <ddb/db_command.h> 46 #include <ddb/db_output.h> 47 #include <ddb/db_interface.h> 48 #include <ddb/db_sym.h> 49 #include <ddb/db_extern.h> 50 51 /* 52 * Character output - tracks position in line. 53 * To do this correctly, we should know how wide 54 * the output device is - then we could zero 55 * the line position when the output device wraps 56 * around to the start of the next line. 57 * 58 * Instead, we count the number of spaces printed 59 * since the last printing character so that we 60 * don't print trailing spaces. This avoids most 61 * of the wraparounds. 62 */ 63 64 #ifndef DB_MAX_LINE 65 #define DB_MAX_LINE 24 /* maximum line */ 66 #endif /* DB_MAX_LINE */ 67 #ifndef DB_MAX_WIDTH 68 #define DB_MAX_WIDTH 80 /* maximum width */ 69 #endif /* DB_MAX_WIDTH */ 70 71 #define DB_MIN_MAX_WIDTH 20 /* minimum max width */ 72 #define DB_MIN_MAX_LINE 3 /* minimum max line */ 73 #define CTRL(c) ((c) & 0xff) 74 75 int db_output_line = 0; /* output line number */ 76 int db_tab_stop_width = 8; /* how wide are tab stops? */ 77 int db_max_line = DB_MAX_LINE; /* output max lines */ 78 int db_max_width = DB_MAX_WIDTH; /* output line width */ 79 80 static int db_output_position = 0; /* output column */ 81 static int db_last_non_space = 0; /* last non-space character */ 82 83 static void db_more(void); 84 85 /* 86 * Force pending whitespace. 87 */ 88 void 89 db_force_whitespace(void) 90 { 91 int last_print, next_tab; 92 93 last_print = db_last_non_space; 94 while (last_print < db_output_position) { 95 next_tab = DB_NEXT_TAB(last_print); 96 if (next_tab <= db_output_position) { 97 while (last_print < next_tab) { /* DON'T send a tab!! */ 98 cnputc(' '); 99 last_print++; 100 } 101 } else { 102 cnputc(' '); 103 last_print++; 104 } 105 } 106 db_last_non_space = db_output_position; 107 } 108 109 static void 110 db_more(void) 111 { 112 char *p; 113 int quit_output = 0; 114 115 for (p = "--db_more--"; *p; p++) 116 cnputc(*p); 117 switch(cngetc()) { 118 case ' ': 119 db_output_line = 0; 120 break; 121 case 'q': 122 case CTRL('c'): 123 db_output_line = 0; 124 quit_output = 1; 125 break; 126 default: 127 db_output_line--; 128 break; 129 } 130 p = "\b\b\b\b\b\b\b\b\b\b\b \b\b\b\b\b\b\b\b\b\b\b"; 131 while (*p) 132 cnputc(*p++); 133 if (quit_output) { 134 db_error(0); 135 /* NOTREACHED */ 136 } 137 } 138 139 /* 140 * Output character. Buffer whitespace. 141 */ 142 void 143 db_putchar(int c) 144 { 145 if (db_max_line >= DB_MIN_MAX_LINE && db_output_line >= db_max_line-1) 146 db_more(); 147 if (c > ' ' && c <= '~') { 148 /* 149 * Printing character. 150 * If we have spaces to print, print them first. 151 * Use tabs if possible. 152 */ 153 db_force_whitespace(); 154 cnputc(c); 155 db_output_position++; 156 if (db_max_width >= DB_MIN_MAX_WIDTH 157 && db_output_position >= db_max_width) { 158 /* auto new line */ 159 cnputc('\n'); 160 db_output_position = 0; 161 db_last_non_space = 0; 162 db_output_line++; 163 } 164 db_last_non_space = db_output_position; 165 } else if (c == '\n') { 166 /* Return */ 167 cnputc(c); 168 db_output_position = 0; 169 db_last_non_space = 0; 170 db_output_line++; 171 db_check_interrupt(); 172 } else if (c == '\t') { 173 /* assume tabs every 8 positions */ 174 db_output_position = DB_NEXT_TAB(db_output_position); 175 } else if (c == ' ') { 176 /* space */ 177 db_output_position++; 178 } else if (c == '\007') { 179 /* bell */ 180 cnputc(c); 181 } 182 /* other characters are assumed non-printing */ 183 } 184 185 /* 186 * Return output position 187 */ 188 int 189 db_print_position(void) 190 { 191 192 return (db_output_position); 193 } 194 195 /* 196 * End line if too long. 197 */ 198 void 199 db_end_line(void) 200 { 201 202 if (db_output_position >= db_max_width) 203 db_printf("\n"); 204 } 205 206 /* 207 * Replacement for old '%r' kprintf format. 208 */ 209 void 210 db_format_radix(char *buf, size_t bufsiz, quad_t val, int altflag) 211 { 212 const char *fmt; 213 214 if (db_radix == 16) { 215 db_format_hex(buf, bufsiz, val, altflag); 216 return; 217 } 218 219 if (db_radix == 8) 220 fmt = altflag ? "-%#qo" : "-%qo"; 221 else 222 fmt = altflag ? "-%#qu" : "-%qu"; 223 224 if (val < 0) 225 val = -val; 226 else 227 ++fmt; 228 229 snprintf(buf, bufsiz, fmt, val); 230 } 231 232 /* 233 * Replacement for old '%z' kprintf format. 234 */ 235 void 236 db_format_hex(char *buf, size_t bufsiz, quad_t val, int altflag) 237 { 238 /* Only use alternate form if val is nonzero. */ 239 const char *fmt = (altflag && val) ? "-%#qx" : "-%qx"; 240 241 if (val < 0) 242 val = -val; 243 else 244 ++fmt; 245 246 snprintf(buf, bufsiz, fmt, val); 247 } 248