1 /* 2 * Mach Operating System 3 * Copyright (c) 1991,1990 Carnegie Mellon University 4 * All Rights Reserved. 5 * 6 * Permission to use, copy, modify and distribute this software and its 7 * documentation is hereby granted, provided that both the copyright 8 * notice and this permission notice appear in all copies of the 9 * software, derivative works or modified versions, and any portions 10 * thereof, and that both notices appear in supporting documentation. 11 * 12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS 13 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 15 * 16 * Carnegie Mellon requests users of this software to return to 17 * 18 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 19 * School of Computer Science 20 * Carnegie Mellon University 21 * Pittsburgh PA 15213-3890 22 * 23 * any improvements or extensions that they make and grant Carnegie the 24 * rights to redistribute these changes. 25 * 26 * $Id: db_output.c,v 1.24 1998/07/08 09:11:36 bde Exp $ 27 */ 28 29 /* 30 * Author: David B. Golub, Carnegie Mellon University 31 * Date: 7/90 32 */ 33 34 /* 35 * Printf and character output for debugger. 36 */ 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/cons.h> 41 42 #include <machine/stdarg.h> 43 44 #include <ddb/ddb.h> 45 #include <ddb/db_output.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 static int db_output_position = 0; /* output column */ 60 static int db_last_non_space = 0; /* last non-space character */ 61 db_expr_t db_tab_stop_width = 8; /* how wide are tab stops? */ 62 #define NEXT_TAB(i) \ 63 ((((i) + db_tab_stop_width) / db_tab_stop_width) * db_tab_stop_width) 64 db_expr_t db_max_width = 79; /* output line width */ 65 66 static void db_putchar __P((int c, void *arg)); 67 68 /* 69 * Force pending whitespace. 70 */ 71 void 72 db_force_whitespace() 73 { 74 register int last_print, next_tab; 75 76 last_print = db_last_non_space; 77 while (last_print < db_output_position) { 78 next_tab = NEXT_TAB(last_print); 79 if (next_tab <= db_output_position) { 80 while (last_print < next_tab) { /* DON'T send a tab!!! */ 81 cnputc(' '); 82 last_print++; 83 } 84 } 85 else { 86 cnputc(' '); 87 last_print++; 88 } 89 } 90 db_last_non_space = db_output_position; 91 } 92 93 /* 94 * Output character. Buffer whitespace. 95 */ 96 static void 97 db_putchar(c, arg) 98 int c; /* character to output */ 99 void * arg; 100 { 101 if (c > ' ' && c <= '~') { 102 /* 103 * Printing character. 104 * If we have spaces to print, print them first. 105 * Use tabs if possible. 106 */ 107 db_force_whitespace(); 108 cnputc(c); 109 db_output_position++; 110 db_last_non_space = db_output_position; 111 } 112 else if (c == '\n') { 113 /* Newline */ 114 cnputc(c); 115 db_output_position = 0; 116 db_last_non_space = 0; 117 db_check_interrupt(); 118 } 119 else if (c == '\r') { 120 /* Return */ 121 cnputc(c); 122 db_output_position = 0; 123 db_last_non_space = 0; 124 db_check_interrupt(); 125 } 126 else if (c == '\t') { 127 /* assume tabs every 8 positions */ 128 db_output_position = NEXT_TAB(db_output_position); 129 } 130 else if (c == ' ') { 131 /* space */ 132 db_output_position++; 133 } 134 else if (c == '\007') { 135 /* bell */ 136 cnputc(c); 137 } 138 /* other characters are assumed non-printing */ 139 } 140 141 /* 142 * Return output position 143 */ 144 int 145 db_print_position() 146 { 147 return (db_output_position); 148 } 149 150 /* 151 * Printing 152 */ 153 void 154 #if __STDC__ 155 db_printf(const char *fmt, ...) 156 #else 157 db_printf(fmt) 158 const char *fmt; 159 #endif 160 { 161 va_list listp; 162 163 va_start(listp, fmt); 164 kvprintf (fmt, db_putchar, NULL, db_radix, listp); 165 va_end(listp); 166 } 167 168 int db_indent; 169 170 void 171 #if __STDC__ 172 db_iprintf(const char *fmt,...) 173 #else 174 db_iprintf(fmt) 175 const char *fmt; 176 #endif 177 { 178 register int i; 179 va_list listp; 180 181 for (i = db_indent; i >= 8; i -= 8) 182 db_printf("\t"); 183 while (--i >= 0) 184 db_printf(" "); 185 va_start(listp, fmt); 186 kvprintf (fmt, db_putchar, NULL, db_radix, listp); 187 va_end(listp); 188 } 189 190 /* 191 * End line if too long. 192 */ 193 void 194 db_end_line() 195 { 196 if (db_output_position >= db_max_width) 197 db_printf("\n"); 198 } 199