| 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 | |