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Last change
on this file since 8a2815b was
e9c6fc8,
checked in by Anders Kaseorg <andersk@mit.edu>, 15 years ago
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Replace /* noproto */ comments with static.
Signed-off-by: Anders Kaseorg <andersk@mit.edu>
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-
Property mode set to
100644
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File size:
1.6 KB
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Rev | Line | |
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[124aebc] | 1 | #include <stdlib.h> |
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| 2 | #include <string.h> |
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| 3 | #include "owl.h" |
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| 4 | |
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[db90f03] | 5 | /* |
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| 6 | * At the moment, the obarray is represented as a sorted list of |
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| 7 | * strings. I judge this a reasonable tradeoff between simplicity and |
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| 8 | * reasonable efficient lookup (insertion should be comparatively |
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| 9 | * rare) |
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| 10 | */ |
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| 11 | |
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[af1920fd] | 12 | /* Helper method: Lookup a key in the obarray. If the key exists, |
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| 13 | * return its index, and the interned value in *val. Otherwise, return |
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| 14 | * the index it should be inserted at. |
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| 15 | */ |
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[e9c6fc8] | 16 | static int owl_obarray_lookup(const owl_obarray *oa, const char *key, const char **val) |
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[124aebc] | 17 | { |
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| 18 | int first, last, mid; |
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[e19eb97] | 19 | const char * str; |
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[124aebc] | 20 | int cmp; |
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| 21 | |
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| 22 | mid = 0; |
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| 23 | first = 0; |
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| 24 | last = owl_list_get_size(&(oa->strings)) - 1; |
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| 25 | while(first <= last) { |
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| 26 | mid = first + (last - first)/2; |
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[4d86e06] | 27 | str = owl_list_get_element(&(oa->strings), mid); |
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[124aebc] | 28 | cmp = strcmp(key, str); |
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| 29 | if(cmp == 0) { |
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| 30 | *val = str; |
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| 31 | return mid; |
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| 32 | } else if(cmp < 0) { |
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| 33 | first = mid + 1; |
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| 34 | } else { |
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| 35 | last = mid - 1; |
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| 36 | } |
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| 37 | } |
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| 38 | *val = NULL; |
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| 39 | return mid; |
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| 40 | } |
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| 41 | |
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[af1920fd] | 42 | /* Returns NULL if the string doesn't exist in the obarray */ |
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[b1d5517] | 43 | const char * owl_obarray_find(const owl_obarray *oa, const char * string) |
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[124aebc] | 44 | { |
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[e19eb97] | 45 | const char *v; |
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[124aebc] | 46 | owl_obarray_lookup(oa, string, &v); |
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| 47 | return v; |
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| 48 | } |
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| 49 | |
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[af1920fd] | 50 | /* Inserts the string into the obarray if it doesn't exist */ |
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[e19eb97] | 51 | const char * owl_obarray_insert(owl_obarray *oa, const char * string) |
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[124aebc] | 52 | { |
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[e19eb97] | 53 | const char *v; |
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[124aebc] | 54 | int i; |
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| 55 | i = owl_obarray_lookup(oa, string, &v); |
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| 56 | if(!v) { |
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[fa4562c] | 57 | char *v2 = owl_strdup(string); |
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| 58 | owl_list_insert_element(&(oa->strings), i, v2); |
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| 59 | return v2; |
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[124aebc] | 60 | } |
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| 61 | return v; |
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| 62 | } |
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| 63 | |
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| 64 | void owl_obarray_init(owl_obarray *oa) |
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| 65 | { |
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| 66 | owl_list_create(&(oa->strings)); |
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| 67 | } |
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