1 /* $NetBSD: db_output.c,v 1.17 1997/10/24 18:20:23 chuck 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 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 #define NEXT_TAB(i) \ 74 ((((i) + db_tab_stop_width) / db_tab_stop_width) * db_tab_stop_width) 75 int db_max_line = DB_MAX_LINE; /* output max lines */ 76 int db_max_width = DB_MAX_WIDTH; /* output line width */ 77 78 static void db_more __P((void)); 79 80 /* 81 * Force pending whitespace. 82 */ 83 void 84 db_force_whitespace() 85 { 86 register int last_print, next_tab; 87 88 last_print = db_last_non_space; 89 while (last_print < db_output_position) { 90 next_tab = NEXT_TAB(last_print); 91 if (next_tab <= db_output_position) { 92 while (last_print < next_tab) { /* DON'T send a tab!!! */ 93 cnputc(' '); 94 last_print++; 95 } 96 } 97 else { 98 cnputc(' '); 99 last_print++; 100 } 101 } 102 db_last_non_space = db_output_position; 103 } 104 105 static void 106 db_more() 107 { 108 register char *p; 109 int quit_output = 0; 110 111 for (p = "--db_more--"; *p; p++) 112 cnputc(*p); 113 switch(cngetc()) { 114 case ' ': 115 db_output_line = 0; 116 break; 117 case 'q': 118 case CTRL('c'): 119 db_output_line = 0; 120 quit_output = 1; 121 break; 122 default: 123 db_output_line--; 124 break; 125 } 126 p = "\b\b\b\b\b\b\b\b\b\b\b \b\b\b\b\b\b\b\b\b\b\b"; 127 while (*p) 128 cnputc(*p++); 129 if (quit_output) { 130 db_error(0); 131 /* NOTREACHED */ 132 } 133 } 134 135 /* 136 * Output character. Buffer whitespace. 137 */ 138 void 139 db_putchar(c) 140 int c; /* character to output */ 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-1) { 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 } 163 else if (c == '\n') { 164 /* Return */ 165 cnputc(c); 166 db_output_position = 0; 167 db_last_non_space = 0; 168 db_output_line++; 169 db_check_interrupt(); 170 } 171 else if (c == '\t') { 172 /* assume tabs every 8 positions */ 173 db_output_position = NEXT_TAB(db_output_position); 174 } 175 else if (c == ' ') { 176 /* space */ 177 db_output_position++; 178 } 179 else if (c == '\007') { 180 /* bell */ 181 cnputc(c); 182 } 183 /* other characters are assumed non-printing */ 184 } 185 186 /* 187 * Return output position 188 */ 189 int 190 db_print_position() 191 { 192 return (db_output_position); 193 } 194 195 /* 196 * End line if too long. 197 */ 198 void 199 db_end_line() 200 { 201 if (db_output_position >= db_max_width) 202 db_printf("\n"); 203 } 204