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1 | /* Copyright (C) 1996-2019 Free Software Foundation, Inc. |
---|---|

2 | Contributed by Richard Henderson (rth@tamu.edu) |

3 | This file is part of the GNU C Library. |

4 | |

5 | The GNU C Library is free software; you can redistribute it and/or |

6 | modify it under the terms of the GNU Lesser General Public |

7 | License as published by the Free Software Foundation; either |

8 | version 2.1 of the License, or (at your option) any later version. |

9 | |

10 | The GNU C Library is distributed in the hope that it will be useful, |

11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |

12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |

13 | Lesser General Public License for more details. |

14 | |

15 | You should have received a copy of the GNU Lesser General Public |

16 | License along with the GNU C Library. If not, see |

17 | <http://www.gnu.org/licenses/>. */ |

18 | |

19 | /* Copy no more than COUNT bytes of the null-terminated string from |

20 | SRC to DST. If SRC does not cover all of COUNT, the balance is |

21 | zeroed. */ |

22 | |

23 | #include <sysdep.h> |

24 | |

25 | .set noat |

26 | .set noreorder |

27 | |

28 | .text |

29 | |

30 | ENTRY(strncpy) |

31 | ldgp gp, 0(pv) |

32 | #ifdef PROF |

33 | lda AT, _mcount |

34 | jsr AT, (AT), _mcount |

35 | #endif |

36 | .prologue 1 |

37 | |

38 | mov a0, v0 # set return value now |

39 | beq a2, $zerocount |

40 | jsr t9, __stxncpy # do the work of the copy |

41 | |

42 | bne a2, $multiword # do we have full words left? |

43 | |

44 | .align 3 |

45 | subq t8, 1, t2 # e0 : guess not |

46 | subq t10, 1, t3 # .. e1 : |

47 | or t2, t8, t2 # e0 : clear the bits between the last |

48 | or t3, t10, t3 # .. e1 : written byte and the last byte in |

49 | andnot t3, t2, t3 # e0 : COUNT |

50 | zap t0, t3, t0 # e1 : |

51 | stq_u t0, 0(a0) # e0 : |

52 | ret # .. e1 : |

53 | |

54 | $multiword: |

55 | subq t8, 1, t7 # e0 : clear the final bits in the prev |

56 | or t7, t8, t7 # e1 : word |

57 | zapnot t0, t7, t0 # e0 : |

58 | subq a2, 1, a2 # .. e1 : |

59 | stq_u t0, 0(a0) # e0 : |

60 | addq a0, 8, a0 # .. e1 : |

61 | |

62 | beq a2, 1f # e1 : |

63 | blbc a2, 0f # e1 : |

64 | |

65 | stq_u zero, 0(a0) # e0 : zero one word |

66 | subq a2, 1, a2 # .. e1 : |

67 | addq a0, 8, a0 # e0 : |

68 | beq a2, 1f # .. e1 : |

69 | |

70 | 0: stq_u zero, 0(a0) # e0 : zero two words |

71 | subq a2, 2, a2 # .. e1 : |

72 | stq_u zero, 8(a0) # e0 : |

73 | addq a0, 16, a0 # .. e1 : |

74 | bne a2, 0b # e1 : |

75 | unop |

76 | |

77 | 1: ldq_u t0, 0(a0) # e0 : clear the leading bits in the final |

78 | subq t10, 1, t7 # .. e1 : word |

79 | or t7, t10, t7 # e0 : |

80 | zap t0, t7, t0 # e1 (stall) |

81 | stq_u t0, 0(a0) # e0 : |

82 | |

83 | $zerocount: |

84 | ret # .. e1 : |

85 | |

86 | END(strncpy) |

87 | libc_hidden_builtin_def (strncpy) |

88 |

Warning: That file was not part of the compilation database. It may have many parsing errors.