Mercurial > cpython-lru_cache-weakref
annotate Parser/bitset.c @ 4566:6403c94de50d legacy-trunk
Added safeguard against failure in __del__.
| author | Guido van Rossum <guido@python.org> |
|---|---|
| date | Wed, 27 Nov 1996 19:39:58 +0000 |
| parents | 65d2d8e67da3 |
| children | 1c9a84e0981d |
| rev | line source |
|---|---|
| 145 | 1 /*********************************************************** |
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2 Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam, |
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3 The Netherlands. |
| 145 | 4 |
| 5 All Rights Reserved | |
| 6 | |
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7 Permission to use, copy, modify, and distribute this software and its |
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8 documentation for any purpose and without fee is hereby granted, |
| 145 | 9 provided that the above copyright notice appear in all copies and that |
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10 both that copyright notice and this permission notice appear in |
| 145 | 11 supporting documentation, and that the names of Stichting Mathematisch |
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12 Centrum or CWI or Corporation for National Research Initiatives or |
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13 CNRI not be used in advertising or publicity pertaining to |
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14 distribution of the software without specific, written prior |
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15 permission. |
| 145 | 16 |
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17 While CWI is the initial source for this software, a modified version |
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18 is made available by the Corporation for National Research Initiatives |
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19 (CNRI) at the Internet address ftp://ftp.python.org. |
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20 |
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21 STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH |
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22 REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF |
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23 MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH |
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24 CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL |
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25 DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
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26 PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER |
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27 TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR |
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28 PERFORMANCE OF THIS SOFTWARE. |
| 145 | 29 |
| 30 ******************************************************************/ | |
| 31 | |
| 86 | 32 /* Bitset primitives used by the parser generator */ |
| 6 | 33 |
| 86 | 34 #include "pgenheaders.h" |
| 6 | 35 #include "bitset.h" |
| 36 | |
| 37 bitset | |
| 38 newbitset(nbits) | |
| 39 int nbits; | |
| 40 { | |
| 41 int nbytes = NBYTES(nbits); | |
| 42 bitset ss = NEW(BYTE, nbytes); | |
| 43 | |
| 44 if (ss == NULL) | |
| 45 fatal("no mem for bitset"); | |
| 46 | |
| 47 ss += nbytes; | |
| 48 while (--nbytes >= 0) | |
| 49 *--ss = 0; | |
| 50 return ss; | |
| 51 } | |
| 52 | |
| 53 void | |
| 54 delbitset(ss) | |
| 55 bitset ss; | |
| 56 { | |
| 57 DEL(ss); | |
| 58 } | |
| 59 | |
| 60 int | |
| 61 addbit(ss, ibit) | |
| 62 bitset ss; | |
| 63 int ibit; | |
| 64 { | |
| 65 int ibyte = BIT2BYTE(ibit); | |
| 66 BYTE mask = BIT2MASK(ibit); | |
| 67 | |
| 68 if (ss[ibyte] & mask) | |
| 69 return 0; /* Bit already set */ | |
| 70 ss[ibyte] |= mask; | |
| 71 return 1; | |
| 72 } | |
| 73 | |
| 74 #if 0 /* Now a macro */ | |
| 75 int | |
| 76 testbit(ss, ibit) | |
| 77 bitset ss; | |
| 78 int ibit; | |
| 79 { | |
| 80 return (ss[BIT2BYTE(ibit)] & BIT2MASK(ibit)) != 0; | |
| 81 } | |
| 82 #endif | |
| 83 | |
| 84 int | |
| 85 samebitset(ss1, ss2, nbits) | |
| 86 bitset ss1, ss2; | |
| 87 int nbits; | |
| 88 { | |
| 89 int i; | |
| 90 | |
| 91 for (i = NBYTES(nbits); --i >= 0; ) | |
| 92 if (*ss1++ != *ss2++) | |
| 93 return 0; | |
| 94 return 1; | |
| 95 } | |
| 96 | |
| 97 void | |
| 98 mergebitset(ss1, ss2, nbits) | |
| 99 bitset ss1, ss2; | |
| 100 int nbits; | |
| 101 { | |
| 102 int i; | |
| 103 | |
| 104 for (i = NBYTES(nbits); --i >= 0; ) | |
| 105 *ss1++ |= *ss2++; | |
| 106 } |