1 /* subr_prf.c 4.12 03/03/81 */ 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(*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(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 adx++; 132 goto loop; 133 } 134 135 /* 136 * Printn prints a number n in base b. 137 * We don't use recursion to avoid deep kernel stacks. 138 */ 139 printn(n, b, touser) 140 unsigned long n; 141 { 142 char prbuf[11]; 143 register char *cp; 144 145 if (b == 10 && (int)n < 0) { 146 putchar('-', touser); 147 n = (unsigned)(-(int)n); 148 } 149 cp = prbuf; 150 do { 151 *cp++ = "0123456789abcdef"[n%b]; 152 n /= b; 153 } while (n); 154 do 155 putchar(*--cp, touser); 156 while (cp > prbuf); 157 } 158 159 /* 160 * Panic is called on unresolvable fatal errors. 161 * It prints "panic: mesg", and then reboots. 162 * If we are called twice, then we avoid trying to 163 * sync the disks as this often leads to recursive panics. 164 */ 165 panic(s) 166 char *s; 167 { 168 int bootopt = panicstr ? RB_AUTOBOOT : RB_AUTOBOOT|RB_NOSYNC; 169 170 panicstr = s; 171 printf("panic: %s\n", s); 172 (void) spl0(); 173 boot(RB_PANIC, bootopt); 174 } 175 176 /* 177 * Hard error is the preface to plaintive error messages 178 * about failing device transfers. 179 */ 180 harderr(bp) 181 struct buf *bp; 182 { 183 184 printf("hard err bn%d ", bp->b_blkno); 185 } 186 187 /* 188 * Print a character on console or users terminal. 189 * If destination is console then the last MSGBUFS characters 190 * are saved in msgbuf for inspection later. 191 */ 192 /*ARGSUSED*/ 193 putchar(c, touser) 194 register int c; 195 { 196 197 if (touser) { 198 register struct tty *tp = u.u_ttyp; 199 200 if (tp && (tp->t_state&CARR_ON)) { 201 register s = spl6(); 202 if (c == '\n') 203 ttyoutput('\r', tp); 204 ttyoutput(c, tp); 205 ttstart(tp); 206 splx(s); 207 } 208 return; 209 } 210 if (c != '\0' && c != '\r' && c != 0177 && mfpr(MAPEN)) { 211 if (msgbuf.msg_magic != MSG_MAGIC) { 212 msgbuf.msg_bufx = 0; 213 msgbuf.msg_magic = MSG_MAGIC; 214 } 215 if (msgbuf.msg_bufx < 0 || msgbuf.msg_bufx >= MSG_BSIZE) 216 msgbuf.msg_bufx = 0; 217 msgbuf.msg_bufc[msgbuf.msg_bufx++] = c; 218 } 219 if (c == 0) 220 return; 221 cnputc(c); 222 } 223