| 1 | /* subr_prf.c 3.3 %G% */ |
| 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 | |
| 10 | #ifdef TRACE |
| 11 | #define TRCBUFS 4096 |
| 12 | char trcbuf[TRCBUFS]; |
| 13 | char *trcbufp = trcbuf; |
| 14 | int trcwrap; |
| 15 | int trcprt = TRCBUFS; |
| 16 | #endif |
| 17 | |
| 18 | /* |
| 19 | * In case console is off, |
| 20 | * panicstr contains argument to last |
| 21 | * call to panic. |
| 22 | */ |
| 23 | |
| 24 | char *panicstr; |
| 25 | |
| 26 | /* |
| 27 | * Scaled down version of C Library printf. |
| 28 | * Only %s %u %d (==%u) %o %x %D are recognized. |
| 29 | * Used to print diagnostic information |
| 30 | * directly on console tty. |
| 31 | * Since it is not interrupt driven, |
| 32 | * all system activities are pretty much |
| 33 | * suspended. |
| 34 | * Printf should not be used for chit-chat. |
| 35 | */ |
| 36 | /*VARARGS1*/ |
| 37 | printf(fmt, x1) |
| 38 | register char *fmt; |
| 39 | unsigned x1; |
| 40 | { |
| 41 | |
| 42 | prf(fmt, &x1, 0); |
| 43 | } |
| 44 | |
| 45 | #ifdef TRACE |
| 46 | trace(fmt, x1) |
| 47 | register char *fmt; |
| 48 | unsigned x1; |
| 49 | { |
| 50 | |
| 51 | prf(fmt, &x1, 1); |
| 52 | } |
| 53 | |
| 54 | #endif |
| 55 | |
| 56 | prf(fmt, adx, trace) |
| 57 | register char *fmt; |
| 58 | register unsigned int *adx; |
| 59 | { |
| 60 | register c; |
| 61 | char *s; |
| 62 | |
| 63 | loop: |
| 64 | while((c = *fmt++) != '%') { |
| 65 | if(c == '\0') |
| 66 | return; |
| 67 | putchar(c, trace); |
| 68 | } |
| 69 | c = *fmt++; |
| 70 | if (c == 'X') |
| 71 | printx((long)*adx, trace); |
| 72 | else if (c == 'd' || c == 'u' || c == 'o' || c == 'x') |
| 73 | printn((long)*adx, c=='o'? 8: (c=='x'? 16:10), trace); |
| 74 | else if (c == 's') { |
| 75 | s = (char *)*adx; |
| 76 | while (c = *s++) |
| 77 | #ifdef TRACE |
| 78 | if (trace) { |
| 79 | *trcbufp++ = c; |
| 80 | if (trcbufp >= &trcbuf[TRCBUFS]) { |
| 81 | trcbufp = trcbuf; |
| 82 | trcwrap = 1; |
| 83 | } |
| 84 | } else |
| 85 | #endif |
| 86 | putchar(c, trace); |
| 87 | } else if (c == 'D') { |
| 88 | printn(*(long *)adx, 10, trace); |
| 89 | adx += (sizeof(long) / sizeof(int)) - 1; |
| 90 | } |
| 91 | adx++; |
| 92 | goto loop; |
| 93 | } |
| 94 | |
| 95 | printx(x, trace) |
| 96 | long x; |
| 97 | { |
| 98 | int i; |
| 99 | |
| 100 | for (i = 0; i < 8; i++) |
| 101 | putchar("0123456789ABCDEF"[(x>>((7-i)*4))&0xf], trace); |
| 102 | } |
| 103 | |
| 104 | /* |
| 105 | * Print an unsigned integer in base b. |
| 106 | */ |
| 107 | printn(n, b, trace) |
| 108 | long n; |
| 109 | { |
| 110 | register long a; |
| 111 | |
| 112 | if (n<0) { /* shouldn't happen */ |
| 113 | putchar('-', trace); |
| 114 | n = -n; |
| 115 | } |
| 116 | if(a = n/b) |
| 117 | printn(a, b, trace); |
| 118 | putchar("0123456789ABCDEF"[(int)(n%b)], trace); |
| 119 | } |
| 120 | |
| 121 | /* |
| 122 | * Panic is called on unresolvable |
| 123 | * fatal errors. |
| 124 | * It syncs, prints "panic: mesg" and |
| 125 | * then loops. |
| 126 | */ |
| 127 | panic(s) |
| 128 | char *s; |
| 129 | { |
| 130 | panicstr = s; |
| 131 | update(); |
| 132 | printf("panic: %s\n", s); |
| 133 | spl0(); |
| 134 | for(;;) |
| 135 | ; |
| 136 | } |
| 137 | |
| 138 | /* |
| 139 | * prdev prints a warning message of the |
| 140 | * form "mesg on dev x/y". |
| 141 | * x and y are the major and minor parts of |
| 142 | * the device argument. |
| 143 | */ |
| 144 | prdev(str, dev) |
| 145 | char *str; |
| 146 | dev_t dev; |
| 147 | { |
| 148 | |
| 149 | printf("%s on dev %u/%u\n", str, major(dev), minor(dev)); |
| 150 | } |
| 151 | |
| 152 | /* |
| 153 | * deverr prints a diagnostic from |
| 154 | * a device driver. |
| 155 | * It prints the device, block number, |
| 156 | * and an octal word (usually some error |
| 157 | * status register) passed as argument. |
| 158 | */ |
| 159 | deverror(bp, o1, o2) |
| 160 | register struct buf *bp; |
| 161 | { |
| 162 | |
| 163 | prdev("err", bp->b_dev); |
| 164 | printf("bn=%d er=%x,%x\n", bp->b_blkno, o1,o2); |
| 165 | } |
| 166 | |
| 167 | #ifdef TRACE |
| 168 | dumptrc() |
| 169 | { |
| 170 | register char *cp; |
| 171 | register int pos, nch; |
| 172 | |
| 173 | nch = trcprt; |
| 174 | if (nch < 0 || nch > TRCBUFS) |
| 175 | nch = TRCBUFS; |
| 176 | pos = (trcbufp - trcbuf) - nch; |
| 177 | if (pos < 0) |
| 178 | if (trcwrap) |
| 179 | pos += TRCBUFS; |
| 180 | else { |
| 181 | nch += pos; |
| 182 | pos = 0; |
| 183 | } |
| 184 | for (cp = &trcbuf[pos]; nch > 0; nch--) { |
| 185 | putchar(*cp++, 0); |
| 186 | if (cp >= &trcbuf[TRCBUFS]) |
| 187 | cp = trcbuf; |
| 188 | } |
| 189 | } |
| 190 | #else |
| 191 | /*ARGSUSED*/ |
| 192 | dumptrc(nch) |
| 193 | int nch; |
| 194 | { |
| 195 | |
| 196 | } |
| 197 | #endif |
| 198 | |
| 199 | char *msgbufp = msgbuf; /* Next saved printf character */ |
| 200 | /* |
| 201 | * Print a character on console or in internal trace buffer. |
| 202 | * If destination is console then the last MSGBUFS characters |
| 203 | * are saved in msgbuf for inspection later. |
| 204 | */ |
| 205 | putchar(c, trace) |
| 206 | register c; |
| 207 | { |
| 208 | register s, timo; |
| 209 | |
| 210 | #ifdef TRACE |
| 211 | if (trace) { |
| 212 | *trcbufp++ = c; |
| 213 | if (trcbufp >= &trcbuf[TRCBUFS]) { |
| 214 | trcbufp = trcbuf; |
| 215 | trcwrap = 1; |
| 216 | } |
| 217 | return; |
| 218 | } |
| 219 | #endif |
| 220 | if (c != '\0' && c != '\r' && c != 0177) { |
| 221 | *msgbufp++ = c; |
| 222 | if (msgbufp >= &msgbuf[MSGBUFS]) |
| 223 | msgbufp = msgbuf; |
| 224 | } |
| 225 | if (c == 0) |
| 226 | return; |
| 227 | cnputc(c); |
| 228 | } |