1 /* $NetBSD: db_output.c,v 1.22 2000/03/30 11:31:27 augustss 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 #include <sys/param.h> 33 #include <sys/systm.h> 34 35 #include <machine/stdarg.h> 36 37 #include <dev/cons.h> 38 39 #include <machine/db_machdep.h> 40 41 #include <ddb/db_command.h> 42 #include <ddb/db_output.h> 43 #include <ddb/db_interface.h> 44 #include <ddb/db_sym.h> 45 #include <ddb/db_extern.h> 46 47 /* 48 * Character output - tracks position in line. 49 * To do this correctly, we should know how wide 50 * the output device is - then we could zero 51 * the line position when the output device wraps 52 * around to the start of the next line. 53 * 54 * Instead, we count the number of spaces printed 55 * since the last printing character so that we 56 * don't print trailing spaces. This avoids most 57 * of the wraparounds. 58 */ 59 60 #ifndef DB_MAX_LINE 61 #define DB_MAX_LINE 24 /* maximum line */ 62 #define DB_MAX_WIDTH 80 /* maximum width */ 63 #endif DB_MAX_LINE 64 65 #define DB_MIN_MAX_WIDTH 20 /* minimum max width */ 66 #define DB_MIN_MAX_LINE 3 /* minimum max line */ 67 #define CTRL(c) ((c) & 0xff) 68 69 int db_output_position = 0; /* output column */ 70 int db_output_line = 0; /* output line number */ 71 int db_last_non_space = 0; /* last non-space character */ 72 int db_tab_stop_width = 8; /* how wide are tab stops? */ 73 int db_max_line = DB_MAX_LINE; /* output max lines */ 74 int db_max_width = DB_MAX_WIDTH; /* output line width */ 75 76 static void db_more __P((void)); 77 78 /* 79 * Force pending whitespace. 80 */ 81 void 82 db_force_whitespace() 83 { 84 int last_print, next_tab; 85 86 last_print = db_last_non_space; 87 while (last_print < db_output_position) { 88 next_tab = DB_NEXT_TAB(last_print); 89 if (next_tab <= db_output_position) { 90 while (last_print < next_tab) { /* DON'T send a tab!!! */ 91 cnputc(' '); 92 last_print++; 93 } 94 } 95 else { 96 cnputc(' '); 97 last_print++; 98 } 99 } 100 db_last_non_space = db_output_position; 101 } 102 103 static void 104 db_more() 105 { 106 char *p; 107 int quit_output = 0; 108 109 for (p = "--db_more--"; *p; p++) 110 cnputc(*p); 111 switch(cngetc()) { 112 case ' ': 113 db_output_line = 0; 114 break; 115 case 'q': 116 case CTRL('c'): 117 db_output_line = 0; 118 quit_output = 1; 119 break; 120 default: 121 db_output_line--; 122 break; 123 } 124 p = "\b\b\b\b\b\b\b\b\b\b\b \b\b\b\b\b\b\b\b\b\b\b"; 125 while (*p) 126 cnputc(*p++); 127 if (quit_output) { 128 db_error(0); 129 /* NOTREACHED */ 130 } 131 } 132 133 /* 134 * Output character. Buffer whitespace. 135 */ 136 void 137 db_putchar(c) 138 int c; /* character to output */ 139 { 140 if (db_max_line >= DB_MIN_MAX_LINE && db_output_line >= db_max_line-1) 141 db_more(); 142 if (c > ' ' && c <= '~') { 143 /* 144 * Printing character. 145 * If we have spaces to print, print them first. 146 * Use tabs if possible. 147 */ 148 db_force_whitespace(); 149 cnputc(c); 150 db_output_position++; 151 if (db_max_width >= DB_MIN_MAX_WIDTH 152 && db_output_position >= db_max_width) { 153 /* auto new line */ 154 cnputc('\n'); 155 db_output_position = 0; 156 db_last_non_space = 0; 157 db_output_line++; 158 } 159 db_last_non_space = db_output_position; 160 } 161 else if (c == '\n') { 162 /* Return */ 163 cnputc(c); 164 db_output_position = 0; 165 db_last_non_space = 0; 166 db_output_line++; 167 db_check_interrupt(); 168 } 169 else if (c == '\t') { 170 /* assume tabs every 8 positions */ 171 db_output_position = DB_NEXT_TAB(db_output_position); 172 } 173 else if (c == ' ') { 174 /* space */ 175 db_output_position++; 176 } 177 else if (c == '\007') { 178 /* bell */ 179 cnputc(c); 180 } 181 /* other characters are assumed non-printing */ 182 } 183 184 /* 185 * Return output position 186 */ 187 int 188 db_print_position() 189 { 190 return (db_output_position); 191 } 192 193 /* 194 * End line if too long. 195 */ 196 void 197 db_end_line() 198 { 199 if (db_output_position >= db_max_width) 200 db_printf("\n"); 201 } 202