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53
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1 __code cbc_consoleread2 ()
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2 {
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3 struct inode *ip = proc->cbc_arg.cbc_console_arg.ip;
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4 __code(*next)(int ret) = proc->cbc_arg.cbc_console_arg.next;
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5 if (input.r == input.w) {
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6 if (proc->killed) {
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7 release(&input.lock);
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8 ilock(ip);
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9 goto next(-1);
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10 }
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11 goto cbc_sleep(&input.r, &input.lock, cbc_consoleread2);
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12 }
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13 goto cbc_consoleread1();
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14 }
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15
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16 __code cbc_consoleread1 ()
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17 {
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18 int cont = 1;
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19 int n = proc->cbc_arg.cbc_console_arg.n;
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20 int target = proc->cbc_arg.cbc_console_arg.target;
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21 char* dst = proc->cbc_arg.cbc_console_arg.dst;
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22 struct inode *ip = proc->cbc_arg.cbc_console_arg.ip;
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23 __code(*next)(int ret) = proc->cbc_arg.cbc_console_arg.next;
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24
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25 int c = input.buf[input.r++ % INPUT_BUF];
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26
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27 if (c == C('D')) { // EOF
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28 if (n < target) {
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29 // Save ^D for next time, to make sure
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30 // caller gets a 0-byte result.
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31 input.r--;
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32 }
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33 cont = 0;
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34 }
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35
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36 *dst++ = c;
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37 --n;
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38
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39 if (c == '\n') {
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40 cont = 0;
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41 }
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42
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43 if (cont == 1) {
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44 if (n > 0) {
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45 proc->cbc_arg.cbc_console_arg.n = n;
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46 proc->cbc_arg.cbc_console_arg.target = target;
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47 proc->cbc_arg.cbc_console_arg.dst = dst;
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48 proc->cbc_arg.cbc_console_arg.ip = ip;
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49 proc->cbc_arg.cbc_console_arg.next = next;
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50 goto cbc_sleep(&input.r, &input.lock, cbc_consoleread2);
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51 }
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52 }
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53
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54 release(&input.lock);
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55 ilock(ip);
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56
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57 goto next(target - n);
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58 }
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59
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60 __code cbc_consoleread (struct inode *ip, char *dst, int n, __code(*next)(int ret))
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61 {
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62 uint target;
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63
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64 iunlock(ip);
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65
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66 target = n;
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67 acquire(&input.lock);
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68
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69 if (n > 0) {
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70 proc->cbc_arg.cbc_console_arg.n = n;
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71 proc->cbc_arg.cbc_console_arg.target = target;
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72 proc->cbc_arg.cbc_console_arg.dst = dst;
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73 proc->cbc_arg.cbc_console_arg.ip = ip;
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74 proc->cbc_arg.cbc_console_arg.next = next;
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75 goto cbc_consoleread2();
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76 }
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77 goto cbc_consoleread1();
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78 }
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79
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