1 /* subr_prf.c 4.17 81/05/11 */ 2 3 #include "../h/param.h" 4 #include "../h/systm.h" 5 #include "../h/seg.h" 6 #include "../h/buf.h" 7 #include "../h/conf.h" 8 #include "../h/mtpr.h" 9 #include "../h/reboot.h" 10 #include "../h/vm.h" 11 #include "../h/msgbuf.h" 12 #include "../h/dir.h" 13 #include "../h/user.h" 14 #include "../h/tty.h" 15 16 /* 17 * In case console is off, 18 * panicstr contains argument to last 19 * call to panic. 20 */ 21 char *panicstr; 22 23 /* 24 * Scaled down version of C Library printf. 25 * Used to print diagnostic information directly on console tty. 26 * Since it is not interrupt driven, all system activities are 27 * suspended. Printf should not be used for chit-chat. 28 * 29 * One additional format: %b is supported to decode error registers. 30 * Usage is: 31 * printf("reg=%b\n", regval, "<base><arg>*"); 32 * Where <base> is the output base expressed as a control character, 33 * e.g. \10 gives octal; \20 gives hex. Each arg is a sequence of 34 * characters, the first of which gives the bit number to be inspected 35 * (origin 1), and the next characters (up to a control character, i.e. 36 * a character <= 32), give the name of the register. Thus 37 * printf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n"); 38 * would produce output: 39 * reg=2<BITTWO,BITONE> 40 */ 41 /*VARARGS1*/ 42 printf(fmt, x1) 43 char *fmt; 44 unsigned x1; 45 { 46 47 prf(fmt, &x1, 0); 48 } 49 50 /* 51 * Uprintf prints to the current user's terminal, 52 * guarantees not to sleep (so can be called by interrupt routines) 53 * and does no watermark checking - (so no verbose messages). 54 */ 55 /*VARARGS1*/ 56 uprintf(fmt, x1) 57 char *fmt; 58 unsigned x1; 59 { 60 61 prf(fmt, &x1, 2); 62 } 63 64 prf(fmt, adx, touser) 65 register char *fmt; 66 register u_int *adx; 67 { 68 register int b, c, i; 69 char *s; 70 int any; 71 72 loop: 73 while ((c = *fmt++) != '%') { 74 if(c == '\0') 75 return; 76 putchar(c, touser); 77 } 78 again: 79 c = *fmt++; 80 /* THIS CODE IS VAX DEPENDENT IN HANDLING %l? AND %c */ 81 switch (c) { 82 83 case 'l': 84 goto again; 85 case 'x': case 'X': 86 b = 16; 87 goto number; 88 case 'd': case 'D': 89 case 'u': /* what a joke */ 90 b = 10; 91 goto number; 92 case 'o': case 'O': 93 b = 8; 94 number: 95 printn((u_long)*adx, b, touser); 96 break; 97 case 'c': 98 b = *adx; 99 for (i = 24; i >= 0; i -= 8) 100 if (c = (b >> i) & 0x7f) 101 putchar(c, touser); 102 break; 103 case 'b': 104 b = *adx++; 105 s = (char *)*adx; 106 printn((u_long)b, *s++, touser); 107 any = 0; 108 if (b) { 109 putchar('<', touser); 110 while (i = *s++) { 111 if (b & (1 << (i-1))) { 112 if (any) 113 putchar(',', touser); 114 any = 1; 115 for (; (c = *s) > 32; s++) 116 putchar(c, touser); 117 } else 118 for (; *s > 32; s++) 119 ; 120 } 121 putchar('>', touser); 122 } 123 break; 124 125 case 's': 126 s = (char *)*adx; 127 while (c = *s++) 128 putchar(c, touser); 129 break; 130 131 case '%': 132 putchar('%', touser); 133 break; 134 } 135 adx++; 136 goto loop; 137 } 138 139 /* 140 * Printn prints a number n in base b. 141 * We don't use recursion to avoid deep kernel stacks. 142 */ 143 printn(n, b, touser) 144 u_long n; 145 { 146 char prbuf[11]; 147 register char *cp; 148 149 if (b == 10 && (int)n < 0) { 150 putchar('-', touser); 151 n = (unsigned)(-(int)n); 152 } 153 cp = prbuf; 154 do { 155 *cp++ = "0123456789abcdef"[n%b]; 156 n /= b; 157 } while (n); 158 do 159 putchar(*--cp, touser); 160 while (cp > prbuf); 161 } 162 163 /* 164 * Panic is called on unresolvable fatal errors. 165 * It prints "panic: mesg", and then reboots. 166 * If we are called twice, then we avoid trying to 167 * sync the disks as this often leads to recursive panics. 168 */ 169 panic(s) 170 char *s; 171 { 172 int bootopt = panicstr ? RB_AUTOBOOT : RB_AUTOBOOT|RB_NOSYNC; 173 174 panicstr = s; 175 printf("panic: %s\n", s); 176 (void) spl0(); 177 boot(RB_PANIC, bootopt); 178 } 179 180 /* 181 * Warn that a system table is full. 182 */ 183 tablefull(tab) 184 char *tab; 185 { 186 187 printf("%s: table is full\n", tab); 188 } 189 190 /* 191 * Hard error is the preface to plaintive error messages 192 * about failing disk transfers. 193 */ 194 harderr(bp, cp) 195 struct buf *bp; 196 char *cp; 197 { 198 199 printf("%s%d%c: hard error sn%d ", cp, 200 dkunit(bp), 'a'+(minor(bp->b_dev)&07), bp->b_blkno); 201 } 202 203 /* 204 * Print a character on console or users terminal. 205 * If destination is console then the last MSGBUFS characters 206 * are saved in msgbuf for inspection later. 207 */ 208 /*ARGSUSED*/ 209 putchar(c, touser) 210 register int c; 211 { 212 213 if (touser) { 214 register struct tty *tp = u.u_ttyp; 215 216 if (tp && (tp->t_state&CARR_ON)) { 217 register s = spl6(); 218 if (c == '\n') 219 ttyoutput('\r', tp); 220 ttyoutput(c, tp); 221 ttstart(tp); 222 splx(s); 223 } 224 return; 225 } 226 if (c != '\0' && c != '\r' && c != 0177 && mfpr(MAPEN)) { 227 if (msgbuf.msg_magic != MSG_MAGIC) { 228 msgbuf.msg_bufx = 0; 229 msgbuf.msg_magic = MSG_MAGIC; 230 } 231 if (msgbuf.msg_bufx < 0 || msgbuf.msg_bufx >= MSG_BSIZE) 232 msgbuf.msg_bufx = 0; 233 msgbuf.msg_bufc[msgbuf.msg_bufx++] = c; 234 } 235 if (c == 0) 236 return; 237 cnputc(c); 238 } 239