2 Copyright (c) 2009 Joseph A. Adams
5 Redistribution and use in source and binary forms, with or without
6 modification, are permitted provided that the following conditions
8 1. Redistributions of source code must retain the above copyright
9 notice, this list of conditions and the following disclaimer.
10 2. Redistributions in binary form must reproduce the above copyright
11 notice, this list of conditions and the following disclaimer in the
12 documentation and/or other materials provided with the distribution.
13 3. The name of the author may not be used to endorse or promote products
14 derived from this software without specific prior written permission.
16 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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21 NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 #define ARRAY_USE_TALLOC
37 #ifdef ARRAY_USE_TALLOC
38 #include <ccan/talloc/talloc.h>
41 #define HAVE_ATTRIBUTE_MAY_ALIAS 1
43 //Use the array_alias macro to indicate that a pointer has changed but strict aliasing rules are too stupid to know it
44 #if HAVE_ATTRIBUTE_MAY_ALIAS==1
45 #define array_alias(ptr) /* nothing */
46 #define array(type) struct {type *item; size_t size; size_t alloc;} __attribute__((__may_alias__))
48 #define array_alias(ptr) qsort(ptr, 0, 1, array_alias_helper) //hack
49 #define array(type) struct {type *item; size_t size; size_t alloc;}
52 //We call allocator functions directly
53 #ifndef ARRAY_USE_TALLOC
55 #define array_new() {0,0,0}
56 #define array_init(array) do {(array).item=0; (array).size=0; (array).alloc=0;} while(0)
57 #define array_realloc(array, newAlloc) do {(array).item = realloc((array).item, ((array).alloc = (newAlloc))*sizeof(*(array).item));} while(0)
58 #define array_free(array) do {free((array).item);} while(0)
62 //note: the allocations are given an extra byte to prevent free (and thus loss of ctx) on realloc to size 0
64 #define array_new(ctx) {talloc_size(ctx,1), 0,0}
65 #define array_init(array, ctx) do {(array).item=talloc_size(ctx,1); (array).size=0; (array).alloc=0;} while(0)
66 #define array_realloc(array, newAlloc) do {(array).item = talloc_realloc_size(NULL, (array).item, ((array).alloc = (newAlloc))*sizeof(*(array).item) +1);} while(0)
67 #define array_free(array) do {talloc_free((array).item);} while(0)
72 //We call helper functions
73 #define array_resize(array, newSize) do {(array).size = (newSize); if ((array).size > (array).alloc) { array_resize_helper((array_char*)&(array), sizeof(*(array).item)); array_alias(&(array));}} while(0)
74 #define array_resize0(array, newSize) do {array_resize0_helper((array_char*)&(array), sizeof(*(array).item), newSize);} while(0)
75 #define array_prepend_lit(array, stringLiteral) do {array_insert_items_helper((array_char*)&(array), sizeof(*(array).item), 0, stringLiteral, sizeof(stringLiteral)-1, 1); array_alias(&(array)); (array).item[--(array).size] = 0;} while(0)
76 #define array_prepend_string(array, str) do {const char *__str = (str); size_t __len = strlen(__str); array_insert_items_helper((array_char*)&(array), sizeof(*(array).item), 0, __str, __len, 1); array_alias(&(array)); (array).item[--(array).size] = 0;} while(0)
77 #define array_prepend_items(array, items, count) do {array_insert_items_helper((array_char*)&(array), sizeof(*(array).item), 0, items, count, 0); array_alias(&(array));} while(0)
80 //We call other array_* macros
81 #define array_from_c(array, c_array) array_from_items(array, c_array, sizeof(c_array)/sizeof(*(c_array)))
82 #define array_from_lit(array, stringLiteral) do {array_from_items(array, stringLiteral, sizeof(stringLiteral)); (array).size--;} while(0)
83 #define array_from_string(array, str) do {const char *__str = (str); array_from_items(array, __str, strlen(__str)+1); (array).size--;} while(0)
84 #define array_from_items(array, items, count) do {size_t __count = (count); array_resize(array, __count); memcpy((array).item, items, __count*sizeof(*(array).item));} while(0)
85 #define array_append(array, ...) do {array_resize(array, (array).size+1); (array).item[(array).size-1] = (__VA_ARGS__);} while(0)
86 #define array_append_string(array, str) do {const char *__str = (str); array_append_items(array, __str, strlen(__str)+1); (array).size--;} while(0)
87 #define array_append_lit(array, stringLiteral) do {array_append_items(array, stringLiteral, sizeof(stringLiteral)); (array).size--;} while(0)
88 #define array_append_items(array, items, count) do {size_t __count = (count); array_resize(array, (array).size+__count); memcpy((array).item+(array).size-__count, items, __count*sizeof(*(array).item));} while(0)
89 #define array_prepend(array, ...) do {array_resize(array, (array).size+1); memmove((array).item+1, (array).item, ((array).size-1)*sizeof(*(array).item)); *(array).item = (__VA_ARGS__);} while(0)
90 #define array_push(array, ...) array_append(array, __VA_ARGS__)
91 #define array_pop(array) ((array).size ? array_pop_nocheck(array) : NULL)
93 #define array_growalloc(array, newAlloc) do {size_t __newAlloc=(newAlloc); if (__newAlloc > (array).alloc) array_realloc(array, (__newAlloc+63)&~63); } while(0)
94 #if HAVE_STATEMENT_EXPR==1
95 #define array_make_room(array, room) ({size_t newAlloc = (array).size+(room); if ((array).alloc<newAlloc) array_realloc(array, newAlloc); (array).item+(array).size; })
99 //We do just fine by ourselves
100 #define array_pop_nocheck(array) ((array).item[--(array).size])
104 #define array_appends(array, ...) do {typeof((*(array).item)) __src[] = {__VA_ARGS__}; array_append_items(array, __src, sizeof(__src)/sizeof(*__src));} while(0)
105 #define array_prepends(array, ...) do {typeof((*(array).item)) __src[] = {__VA_ARGS__}; array_prepend_items(array, __src, sizeof(__src)/sizeof(*__src));} while(0)
106 #define array_for(var, array, ...) do {typeof(*(array).item) *var=(void*)(array).item; size_t _r=(array).size, _i=0; for (;_r--;_i++, var++) { __VA_ARGS__ ;} } while(0)
107 #define array_rof(var, array, ...) do {typeof(*(array).item) *var=(void*)(array).item; size_t _i=(array).size, _r=0; var += _i; for (;_i--;_r++) { var--; __VA_ARGS__ ;} } while(0)
111 typedef array(char) array_char;
113 void array_resize_helper(array_char *a, size_t itemSize);
114 void array_resize0_helper(array_char *a, size_t itemSize, size_t newSize);
115 void array_insert_items_helper(array_char *a, size_t itemSize, size_t pos, const void *items, size_t count, size_t tailSize);
116 //Note: there is no array_insert_items yet, but it wouldn't be too hard to add.
118 int array_alias_helper(const void *a, const void *b);
124 array_growalloc(array, newAlloc) sees if the array can currently hold newAlloc items;
125 if not, it increases the alloc to satisfy this requirement, allocating slack
126 space to avoid having to reallocate for every size increment.
128 array_from_string(array, str) copys a string to an array_char.
130 array_push(array, item) pushes an item to the end of the array.
131 array_pop_nocheck(array) pops it back out. Be sure there is at least one item in the array before calling.
132 array_pop(array) does the same as array_pop_nocheck, but returns NULL if there are no more items left in the array.
134 array_make_room(array, room) ensures there's 'room' elements of space after the end of the array, and it returns a pointer to this space.
135 Currently requires HAVE_STATEMENT_EXPR, but I plan to remove this dependency by creating an inline function.
137 The following require HAVE_TYPEOF==1 :
139 array_appends(array, item0, item1...) appends a collection of comma-delimited items to the array.
140 array_prepends(array, item0, item1...) prepends a collection of comma-delimited items to the array.
141 array_for(var, array, commands...) iterates forward through the items in the array using var. var is a pointer to an item.
142 array_rof(var, array, commands...) iterates backward through the items in the array using var. var is a pointer to an item.
147 array_appends(array, 0,1,2,3,4);
148 array_appends(array, -5,-4,-3,-2,-1);
149 array_for(i, array, printf("%d ", *i));
153 array(struct {int n,d;}) fractions;
154 array_appends(fractions, {3,4}, {3,5}, {2,1});
155 array_for(i, fractions, printf("%d/%d\n", i->n, i->d));
156 array_free(fractions);
185 array_append <- array_push
186 array_resize <- array_append
187 array_from_items <- array_from_c, array_from_lit, array_from_string
188 array_append_items <- array_append_string, array_append_lit
189 array_prepend_items <- array_prepends