| 1 | |
| 2 | /* |
| 3 | * Scaled down version of C Library printf. |
| 4 | * Only %s %u %d (==%u) %o %x %D are recognized. |
| 5 | * Used to print diagnostic information |
| 6 | * directly on console tty. |
| 7 | * Since it is not interrupt driven, |
| 8 | * all system activities are pretty much |
| 9 | * suspended. |
| 10 | * Printf should not be used for chit-chat. |
| 11 | */ |
| 12 | printf(fmt, x1) |
| 13 | register char *fmt; |
| 14 | unsigned x1; |
| 15 | { |
| 16 | register c; |
| 17 | register unsigned int *adx; |
| 18 | char *s; |
| 19 | |
| 20 | adx = &x1; |
| 21 | loop: |
| 22 | while((c = *fmt++) != '%') { |
| 23 | if(c == '\0') |
| 24 | return; |
| 25 | putchar(c); |
| 26 | } |
| 27 | c = *fmt++; |
| 28 | if(c == 'd' || c == 'u' || c == 'o' || c == 'x') |
| 29 | printn((long)*adx, c=='o'? 8: (c=='x'? 16:10)); |
| 30 | else if(c == 's') { |
| 31 | s = (char *)*adx; |
| 32 | while(c = *s++) |
| 33 | putchar(c); |
| 34 | } else if (c == 'D') { |
| 35 | printn(*(long *)adx, 10); |
| 36 | adx += (sizeof(long) / sizeof(int)) - 1; |
| 37 | } else if (c == 'c') |
| 38 | putchar((char *)*adx); |
| 39 | adx++; |
| 40 | goto loop; |
| 41 | } |
| 42 | |
| 43 | /* |
| 44 | * Print an unsigned integer in base b. |
| 45 | */ |
| 46 | printn(n, b) |
| 47 | long n; |
| 48 | { |
| 49 | register long a; |
| 50 | |
| 51 | if (n<0) { /* shouldn't happen */ |
| 52 | putchar('-'); |
| 53 | n = -n; |
| 54 | } |
| 55 | if(a = n/b) |
| 56 | printn(a, b); |
| 57 | putchar("0123456789ABCDEF"[(int)(n%b)]); |
| 58 | } |
| 59 | |
| 60 | |
| 61 | |
| 62 | struct device { |
| 63 | int rcsr,rbuf; |
| 64 | int tcsr,tbuf; |
| 65 | }; |
| 66 | struct device *KLADDR {0177560}; |
| 67 | putchar(c) |
| 68 | register c; |
| 69 | { |
| 70 | register s; |
| 71 | register unsigned timo; |
| 72 | |
| 73 | /* |
| 74 | * If last char was a break or null, don't print |
| 75 | if ((KLADDR->rbuf&0177) == 0) |
| 76 | return; |
| 77 | */ |
| 78 | timo = 60000; |
| 79 | /* |
| 80 | * Try waiting for the console tty to come ready, |
| 81 | * otherwise give up after a reasonable time. |
| 82 | */ |
| 83 | while((KLADDR->tcsr&0200) == 0) |
| 84 | if(--timo == 0) |
| 85 | break; |
| 86 | if(c == 0) |
| 87 | return; |
| 88 | s = KLADDR->tcsr; |
| 89 | KLADDR->tcsr = 0; |
| 90 | KLADDR->tbuf = c; |
| 91 | if(c == '\n') { |
| 92 | putchar('\r'); |
| 93 | putchar(0177); |
| 94 | putchar(0177); |
| 95 | } |
| 96 | putchar(0); |
| 97 | KLADDR->tcsr = s; |
| 98 | } |
| 99 | |
| 100 | getchar() |
| 101 | { |
| 102 | register c; |
| 103 | |
| 104 | KLADDR->rcsr = 1; |
| 105 | while((KLADDR->rcsr&0200)==0); |
| 106 | c = KLADDR->rbuf&0177; |
| 107 | if (c=='\r') |
| 108 | c = '\n'; |
| 109 | putchar(c); |
| 110 | return(c); |
| 111 | } |
| 112 | |
| 113 | gets(buf) |
| 114 | char *buf; |
| 115 | { |
| 116 | register char *lp; |
| 117 | register c; |
| 118 | |
| 119 | lp = buf; |
| 120 | for (;;) { |
| 121 | c = getchar() & 0177; |
| 122 | if (c>='A' && c<='Z') |
| 123 | c -= 'A' - 'a'; |
| 124 | if (lp != buf && *(lp-1) == '\\') { |
| 125 | lp--; |
| 126 | if (c>='a' && c<='z') { |
| 127 | c += 'A' - 'a'; |
| 128 | goto store; |
| 129 | } |
| 130 | switch ( c) { |
| 131 | case '(': |
| 132 | c = '{'; |
| 133 | break; |
| 134 | case ')': |
| 135 | c = '}'; |
| 136 | break; |
| 137 | case '!': |
| 138 | c = '|'; |
| 139 | break; |
| 140 | case '^': |
| 141 | c = '~'; |
| 142 | break; |
| 143 | case '\'': |
| 144 | c = '`'; |
| 145 | break; |
| 146 | } |
| 147 | } |
| 148 | store: |
| 149 | switch(c) { |
| 150 | case '\n': |
| 151 | case '\r': |
| 152 | c = '\n'; |
| 153 | *lp++ = '\0'; |
| 154 | return; |
| 155 | case '\b': |
| 156 | case '#': |
| 157 | lp--; |
| 158 | if (lp < buf) |
| 159 | lp = buf; |
| 160 | continue; |
| 161 | case '@': |
| 162 | lp = buf; |
| 163 | putchar('\n'); |
| 164 | continue; |
| 165 | default: |
| 166 | *lp++ = c; |
| 167 | } |
| 168 | } |
| 169 | } |