src/buffer.c

Sun, 22 Dec 2024 22:53:53 +0100

author
Mike Becker <universe@uap-core.de>
date
Sun, 22 Dec 2024 22:53:53 +0100
changeset 1049
415bf2ce6bab
parent 1040
1ecf4dbbc60c
permissions
-rw-r--r--

fix cx_hash_key_cxstr() being a macro

issue #536

483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
1 /*
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
3 *
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
4 * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
5 *
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
6 * Redistribution and use in source and binary forms, with or without
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
7 * modification, are permitted provided that the following conditions are met:
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
8 *
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
9 * 1. Redistributions of source code must retain the above copyright
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
10 * notice, this list of conditions and the following disclaimer.
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
11 *
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
12 * 2. Redistributions in binary form must reproduce the above copyright
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
13 * notice, this list of conditions and the following disclaimer in the
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
14 * documentation and/or other materials provided with the distribution.
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
15 *
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
26 * POSSIBILITY OF SUCH DAMAGE.
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
27 */
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
28
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
29 #include "cx/buffer.h"
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
30
530
e866516cac17 #170 first buffer tests
Mike Becker <universe@uap-core.de>
parents: 529
diff changeset
31 #include <stdio.h>
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
32 #include <string.h>
1040
1ecf4dbbc60c add some more overflow treatment and make sure to set errno properly
Mike Becker <universe@uap-core.de>
parents: 1030
diff changeset
33 #include <errno.h>
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
34
1028
3e4905241838 add copy-on-extend feature to UCX buffer - fixes #533
Mike Becker <universe@uap-core.de>
parents: 1024
diff changeset
35 static int buffer_copy_on_write(CxBuffer* buffer) {
1024
8f99f6c28bd3 add copy-on-write feature to UCX buffer - fixes #531
Mike Becker <universe@uap-core.de>
parents: 1007
diff changeset
36 if (0 == (buffer->flags & CX_BUFFER_COPY_ON_WRITE)) return 0;
1028
3e4905241838 add copy-on-extend feature to UCX buffer - fixes #533
Mike Becker <universe@uap-core.de>
parents: 1024
diff changeset
37 void *newspace = cxMalloc(buffer->allocator, buffer->capacity);
1024
8f99f6c28bd3 add copy-on-write feature to UCX buffer - fixes #531
Mike Becker <universe@uap-core.de>
parents: 1007
diff changeset
38 if (NULL == newspace) return -1;
8f99f6c28bd3 add copy-on-write feature to UCX buffer - fixes #531
Mike Becker <universe@uap-core.de>
parents: 1007
diff changeset
39 memcpy(newspace, buffer->space, buffer->size);
8f99f6c28bd3 add copy-on-write feature to UCX buffer - fixes #531
Mike Becker <universe@uap-core.de>
parents: 1007
diff changeset
40 buffer->space = newspace;
8f99f6c28bd3 add copy-on-write feature to UCX buffer - fixes #531
Mike Becker <universe@uap-core.de>
parents: 1007
diff changeset
41 buffer->flags &= ~CX_BUFFER_COPY_ON_WRITE;
8f99f6c28bd3 add copy-on-write feature to UCX buffer - fixes #531
Mike Becker <universe@uap-core.de>
parents: 1007
diff changeset
42 buffer->flags |= CX_BUFFER_FREE_CONTENTS;
8f99f6c28bd3 add copy-on-write feature to UCX buffer - fixes #531
Mike Becker <universe@uap-core.de>
parents: 1007
diff changeset
43 return 0;
8f99f6c28bd3 add copy-on-write feature to UCX buffer - fixes #531
Mike Becker <universe@uap-core.de>
parents: 1007
diff changeset
44 }
8f99f6c28bd3 add copy-on-write feature to UCX buffer - fixes #531
Mike Becker <universe@uap-core.de>
parents: 1007
diff changeset
45
501
9a08f5e515cc add allocator support to CxBuffer
Mike Becker <universe@uap-core.de>
parents: 500
diff changeset
46 int cxBufferInit(
9a08f5e515cc add allocator support to CxBuffer
Mike Becker <universe@uap-core.de>
parents: 500
diff changeset
47 CxBuffer *buffer,
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
48 void *space,
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
49 size_t capacity,
890
54565fd74e74 move all const keywords to the west - fixes #426
Mike Becker <universe@uap-core.de>
parents: 761
diff changeset
50 const CxAllocator *allocator,
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
51 int flags
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
52 ) {
989
8aa57a7fecc4 improve consistency for allocator arguments - fixes #485
Mike Becker <universe@uap-core.de>
parents: 985
diff changeset
53 if (allocator == NULL) {
8aa57a7fecc4 improve consistency for allocator arguments - fixes #485
Mike Becker <universe@uap-core.de>
parents: 985
diff changeset
54 allocator = cxDefaultAllocator;
8aa57a7fecc4 improve consistency for allocator arguments - fixes #485
Mike Becker <universe@uap-core.de>
parents: 985
diff changeset
55 }
1028
3e4905241838 add copy-on-extend feature to UCX buffer - fixes #533
Mike Becker <universe@uap-core.de>
parents: 1024
diff changeset
56 if (flags & CX_BUFFER_COPY_ON_EXTEND) {
3e4905241838 add copy-on-extend feature to UCX buffer - fixes #533
Mike Becker <universe@uap-core.de>
parents: 1024
diff changeset
57 flags |= CX_BUFFER_AUTO_EXTEND;
3e4905241838 add copy-on-extend feature to UCX buffer - fixes #533
Mike Becker <universe@uap-core.de>
parents: 1024
diff changeset
58 }
501
9a08f5e515cc add allocator support to CxBuffer
Mike Becker <universe@uap-core.de>
parents: 500
diff changeset
59 buffer->allocator = allocator;
9a08f5e515cc add allocator support to CxBuffer
Mike Becker <universe@uap-core.de>
parents: 500
diff changeset
60 buffer->flags = flags;
9a08f5e515cc add allocator support to CxBuffer
Mike Becker <universe@uap-core.de>
parents: 500
diff changeset
61 if (!space) {
9a08f5e515cc add allocator support to CxBuffer
Mike Becker <universe@uap-core.de>
parents: 500
diff changeset
62 buffer->bytes = cxMalloc(allocator, capacity);
9a08f5e515cc add allocator support to CxBuffer
Mike Becker <universe@uap-core.de>
parents: 500
diff changeset
63 if (buffer->bytes == NULL) {
1024
8f99f6c28bd3 add copy-on-write feature to UCX buffer - fixes #531
Mike Becker <universe@uap-core.de>
parents: 1007
diff changeset
64 return -1;
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
65 }
501
9a08f5e515cc add allocator support to CxBuffer
Mike Becker <universe@uap-core.de>
parents: 500
diff changeset
66 buffer->flags |= CX_BUFFER_FREE_CONTENTS;
9a08f5e515cc add allocator support to CxBuffer
Mike Becker <universe@uap-core.de>
parents: 500
diff changeset
67 } else {
9a08f5e515cc add allocator support to CxBuffer
Mike Becker <universe@uap-core.de>
parents: 500
diff changeset
68 buffer->bytes = space;
9a08f5e515cc add allocator support to CxBuffer
Mike Becker <universe@uap-core.de>
parents: 500
diff changeset
69 }
9a08f5e515cc add allocator support to CxBuffer
Mike Becker <universe@uap-core.de>
parents: 500
diff changeset
70 buffer->capacity = capacity;
9a08f5e515cc add allocator support to CxBuffer
Mike Becker <universe@uap-core.de>
parents: 500
diff changeset
71 buffer->size = 0;
539
9cd98da9ee17 #184 start implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 538
diff changeset
72 buffer->pos = 0;
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
73
539
9cd98da9ee17 #184 start implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 538
diff changeset
74 buffer->flush_func = NULL;
541
67e078518935 #170 complete write tests for status quo
Mike Becker <universe@uap-core.de>
parents: 540
diff changeset
75 buffer->flush_target = NULL;
539
9cd98da9ee17 #184 start implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 538
diff changeset
76 buffer->flush_blkmax = 0;
9cd98da9ee17 #184 start implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 538
diff changeset
77 buffer->flush_blksize = 4096;
9cd98da9ee17 #184 start implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 538
diff changeset
78 buffer->flush_threshold = SIZE_MAX;
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
79
501
9a08f5e515cc add allocator support to CxBuffer
Mike Becker <universe@uap-core.de>
parents: 500
diff changeset
80 return 0;
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
81 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
82
500
eb9e7bd40a8e do not hide pointers behind typedefs
Mike Becker <universe@uap-core.de>
parents: 489
diff changeset
83 void cxBufferDestroy(CxBuffer *buffer) {
1024
8f99f6c28bd3 add copy-on-write feature to UCX buffer - fixes #531
Mike Becker <universe@uap-core.de>
parents: 1007
diff changeset
84 if (buffer->flags & CX_BUFFER_FREE_CONTENTS) {
501
9a08f5e515cc add allocator support to CxBuffer
Mike Becker <universe@uap-core.de>
parents: 500
diff changeset
85 cxFree(buffer->allocator, buffer->bytes);
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
86 }
1030
06091e067bee add cxBufferAppend() - fixes #534
Mike Becker <universe@uap-core.de>
parents: 1028
diff changeset
87 memset(buffer, 0, sizeof(CxBuffer));
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
88 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
89
683
aa0d09f2d81c add convenience functions for allocating a buffer on the heap
Mike Becker <universe@uap-core.de>
parents: 673
diff changeset
90 CxBuffer *cxBufferCreate(
aa0d09f2d81c add convenience functions for allocating a buffer on the heap
Mike Becker <universe@uap-core.de>
parents: 673
diff changeset
91 void *space,
aa0d09f2d81c add convenience functions for allocating a buffer on the heap
Mike Becker <universe@uap-core.de>
parents: 673
diff changeset
92 size_t capacity,
890
54565fd74e74 move all const keywords to the west - fixes #426
Mike Becker <universe@uap-core.de>
parents: 761
diff changeset
93 const CxAllocator *allocator,
683
aa0d09f2d81c add convenience functions for allocating a buffer on the heap
Mike Becker <universe@uap-core.de>
parents: 673
diff changeset
94 int flags
aa0d09f2d81c add convenience functions for allocating a buffer on the heap
Mike Becker <universe@uap-core.de>
parents: 673
diff changeset
95 ) {
989
8aa57a7fecc4 improve consistency for allocator arguments - fixes #485
Mike Becker <universe@uap-core.de>
parents: 985
diff changeset
96 if (allocator == NULL) {
8aa57a7fecc4 improve consistency for allocator arguments - fixes #485
Mike Becker <universe@uap-core.de>
parents: 985
diff changeset
97 allocator = cxDefaultAllocator;
8aa57a7fecc4 improve consistency for allocator arguments - fixes #485
Mike Becker <universe@uap-core.de>
parents: 985
diff changeset
98 }
683
aa0d09f2d81c add convenience functions for allocating a buffer on the heap
Mike Becker <universe@uap-core.de>
parents: 673
diff changeset
99 CxBuffer *buf = cxMalloc(allocator, sizeof(CxBuffer));
aa0d09f2d81c add convenience functions for allocating a buffer on the heap
Mike Becker <universe@uap-core.de>
parents: 673
diff changeset
100 if (buf == NULL) return NULL;
aa0d09f2d81c add convenience functions for allocating a buffer on the heap
Mike Becker <universe@uap-core.de>
parents: 673
diff changeset
101 if (0 == cxBufferInit(buf, space, capacity, allocator, flags)) {
aa0d09f2d81c add convenience functions for allocating a buffer on the heap
Mike Becker <universe@uap-core.de>
parents: 673
diff changeset
102 return buf;
aa0d09f2d81c add convenience functions for allocating a buffer on the heap
Mike Becker <universe@uap-core.de>
parents: 673
diff changeset
103 } else {
aa0d09f2d81c add convenience functions for allocating a buffer on the heap
Mike Becker <universe@uap-core.de>
parents: 673
diff changeset
104 cxFree(allocator, buf);
aa0d09f2d81c add convenience functions for allocating a buffer on the heap
Mike Becker <universe@uap-core.de>
parents: 673
diff changeset
105 return NULL;
aa0d09f2d81c add convenience functions for allocating a buffer on the heap
Mike Becker <universe@uap-core.de>
parents: 673
diff changeset
106 }
aa0d09f2d81c add convenience functions for allocating a buffer on the heap
Mike Becker <universe@uap-core.de>
parents: 673
diff changeset
107 }
aa0d09f2d81c add convenience functions for allocating a buffer on the heap
Mike Becker <universe@uap-core.de>
parents: 673
diff changeset
108
aa0d09f2d81c add convenience functions for allocating a buffer on the heap
Mike Becker <universe@uap-core.de>
parents: 673
diff changeset
109 void cxBufferFree(CxBuffer *buffer) {
985
68754c7de906 major refactoring of attributes
Mike Becker <universe@uap-core.de>
parents: 970
diff changeset
110 if (buffer == NULL) return;
1030
06091e067bee add cxBufferAppend() - fixes #534
Mike Becker <universe@uap-core.de>
parents: 1028
diff changeset
111 const CxAllocator *allocator = buffer->allocator;
991
ec49db06dae0 cxBufferFree() now calls cxBufferDestroy()
Mike Becker <universe@uap-core.de>
parents: 989
diff changeset
112 cxBufferDestroy(buffer);
1030
06091e067bee add cxBufferAppend() - fixes #534
Mike Becker <universe@uap-core.de>
parents: 1028
diff changeset
113 cxFree(allocator, buffer);
683
aa0d09f2d81c add convenience functions for allocating a buffer on the heap
Mike Becker <universe@uap-core.de>
parents: 673
diff changeset
114 }
aa0d09f2d81c add convenience functions for allocating a buffer on the heap
Mike Becker <universe@uap-core.de>
parents: 673
diff changeset
115
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
116 int cxBufferSeek(
500
eb9e7bd40a8e do not hide pointers behind typedefs
Mike Becker <universe@uap-core.de>
parents: 489
diff changeset
117 CxBuffer *buffer,
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
118 off_t offset,
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
119 int whence
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
120 ) {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
121 size_t npos;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
122 switch (whence) {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
123 case SEEK_CUR:
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
124 npos = buffer->pos;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
125 break;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
126 case SEEK_END:
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
127 npos = buffer->size;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
128 break;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
129 case SEEK_SET:
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
130 npos = 0;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
131 break;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
132 default:
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
133 return -1;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
134 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
135
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
136 size_t opos = npos;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
137 npos += offset;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
138
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
139 if ((offset > 0 && npos < opos) || (offset < 0 && npos > opos)) {
1040
1ecf4dbbc60c add some more overflow treatment and make sure to set errno properly
Mike Becker <universe@uap-core.de>
parents: 1030
diff changeset
140 errno = EOVERFLOW;
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
141 return -1;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
142 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
143
1007
81b2986d2b04 fix that cxBufferSeek() cannot move pos past the end - fixes #523
Mike Becker <universe@uap-core.de>
parents: 1005
diff changeset
144 if (npos > buffer->size) {
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
145 return -1;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
146 } else {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
147 buffer->pos = npos;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
148 return 0;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
149 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
150
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
151 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
152
529
814d51173f20 #171 const qualifier and nonnull attributes
Mike Becker <universe@uap-core.de>
parents: 501
diff changeset
153 void cxBufferClear(CxBuffer *buffer) {
1024
8f99f6c28bd3 add copy-on-write feature to UCX buffer - fixes #531
Mike Becker <universe@uap-core.de>
parents: 1007
diff changeset
154 if (0 == (buffer->flags & CX_BUFFER_COPY_ON_WRITE)) {
8f99f6c28bd3 add copy-on-write feature to UCX buffer - fixes #531
Mike Becker <universe@uap-core.de>
parents: 1007
diff changeset
155 memset(buffer->bytes, 0, buffer->size);
8f99f6c28bd3 add copy-on-write feature to UCX buffer - fixes #531
Mike Becker <universe@uap-core.de>
parents: 1007
diff changeset
156 }
529
814d51173f20 #171 const qualifier and nonnull attributes
Mike Becker <universe@uap-core.de>
parents: 501
diff changeset
157 buffer->size = 0;
814d51173f20 #171 const qualifier and nonnull attributes
Mike Becker <universe@uap-core.de>
parents: 501
diff changeset
158 buffer->pos = 0;
814d51173f20 #171 const qualifier and nonnull attributes
Mike Becker <universe@uap-core.de>
parents: 501
diff changeset
159 }
814d51173f20 #171 const qualifier and nonnull attributes
Mike Becker <universe@uap-core.de>
parents: 501
diff changeset
160
761
61d5197d612b add cxBufferReset() - resolves #338
Mike Becker <universe@uap-core.de>
parents: 683
diff changeset
161 void cxBufferReset(CxBuffer *buffer) {
61d5197d612b add cxBufferReset() - resolves #338
Mike Becker <universe@uap-core.de>
parents: 683
diff changeset
162 buffer->size = 0;
61d5197d612b add cxBufferReset() - resolves #338
Mike Becker <universe@uap-core.de>
parents: 683
diff changeset
163 buffer->pos = 0;
61d5197d612b add cxBufferReset() - resolves #338
Mike Becker <universe@uap-core.de>
parents: 683
diff changeset
164 }
61d5197d612b add cxBufferReset() - resolves #338
Mike Becker <universe@uap-core.de>
parents: 683
diff changeset
165
1004
d8044fd5005c make cxBufferEof() return a bool
Mike Becker <universe@uap-core.de>
parents: 991
diff changeset
166 bool cxBufferEof(const CxBuffer *buffer) {
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
167 return buffer->pos >= buffer->size;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
168 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
169
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
170 int cxBufferMinimumCapacity(
500
eb9e7bd40a8e do not hide pointers behind typedefs
Mike Becker <universe@uap-core.de>
parents: 489
diff changeset
171 CxBuffer *buffer,
532
080c304ec176 fix cxBufferMinimumCapacity implementation still using additional_bytes
Mike Becker <universe@uap-core.de>
parents: 530
diff changeset
172 size_t newcap
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
173 ) {
532
080c304ec176 fix cxBufferMinimumCapacity implementation still using additional_bytes
Mike Becker <universe@uap-core.de>
parents: 530
diff changeset
174 if (newcap <= buffer->capacity) {
080c304ec176 fix cxBufferMinimumCapacity implementation still using additional_bytes
Mike Becker <universe@uap-core.de>
parents: 530
diff changeset
175 return 0;
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
176 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
177
1028
3e4905241838 add copy-on-extend feature to UCX buffer - fixes #533
Mike Becker <universe@uap-core.de>
parents: 1024
diff changeset
178 const int force_copy_flags = CX_BUFFER_COPY_ON_WRITE | CX_BUFFER_COPY_ON_EXTEND;
3e4905241838 add copy-on-extend feature to UCX buffer - fixes #533
Mike Becker <universe@uap-core.de>
parents: 1024
diff changeset
179 if (buffer->flags & force_copy_flags) {
3e4905241838 add copy-on-extend feature to UCX buffer - fixes #533
Mike Becker <universe@uap-core.de>
parents: 1024
diff changeset
180 void *newspace = cxMalloc(buffer->allocator, newcap);
3e4905241838 add copy-on-extend feature to UCX buffer - fixes #533
Mike Becker <universe@uap-core.de>
parents: 1024
diff changeset
181 if (NULL == newspace) return -1;
3e4905241838 add copy-on-extend feature to UCX buffer - fixes #533
Mike Becker <universe@uap-core.de>
parents: 1024
diff changeset
182 memcpy(newspace, buffer->space, buffer->size);
3e4905241838 add copy-on-extend feature to UCX buffer - fixes #533
Mike Becker <universe@uap-core.de>
parents: 1024
diff changeset
183 buffer->space = newspace;
3e4905241838 add copy-on-extend feature to UCX buffer - fixes #533
Mike Becker <universe@uap-core.de>
parents: 1024
diff changeset
184 buffer->capacity = newcap;
3e4905241838 add copy-on-extend feature to UCX buffer - fixes #533
Mike Becker <universe@uap-core.de>
parents: 1024
diff changeset
185 buffer->flags &= ~force_copy_flags;
3e4905241838 add copy-on-extend feature to UCX buffer - fixes #533
Mike Becker <universe@uap-core.de>
parents: 1024
diff changeset
186 buffer->flags |= CX_BUFFER_FREE_CONTENTS;
3e4905241838 add copy-on-extend feature to UCX buffer - fixes #533
Mike Becker <universe@uap-core.de>
parents: 1024
diff changeset
187 return 0;
1024
8f99f6c28bd3 add copy-on-write feature to UCX buffer - fixes #531
Mike Becker <universe@uap-core.de>
parents: 1007
diff changeset
188 } else if (cxReallocate(buffer->allocator,
536
cb9b9739055e #170 add cxBufferClear test
Mike Becker <universe@uap-core.de>
parents: 534
diff changeset
189 (void **) &buffer->bytes, newcap) == 0) {
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
190 buffer->capacity = newcap;
533
8d70ad8da899 do not implicitly zero freshly allocated memory
Mike Becker <universe@uap-core.de>
parents: 532
diff changeset
191 return 0;
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
192 } else {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
193 return -1;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
194 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
195 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
196
544
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
197 /**
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
198 * Helps flushing data to the flush target of a buffer.
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
199 *
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
200 * @param buffer the buffer containing the config
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
201 * @param space the data to flush
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
202 * @param size the element size
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
203 * @param nitems the number of items
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
204 * @return the number of items flushed
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
205 */
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
206 static size_t cx_buffer_write_flush_helper(
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
207 CxBuffer *buffer,
890
54565fd74e74 move all const keywords to the west - fixes #426
Mike Becker <universe@uap-core.de>
parents: 761
diff changeset
208 const unsigned char *space,
544
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
209 size_t size,
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
210 size_t nitems
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
211 ) {
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
212 size_t pos = 0;
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
213 size_t remaining = nitems;
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
214 size_t max_items = buffer->flush_blksize / size;
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
215 while (remaining > 0) {
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
216 size_t items = remaining > max_items ? max_items : remaining;
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
217 size_t flushed = buffer->flush_func(
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
218 space + pos,
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
219 size, items,
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
220 buffer->flush_target);
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
221 if (flushed > 0) {
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
222 pos += (flushed * size);
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
223 remaining -= flushed;
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
224 } else {
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
225 // if no bytes can be flushed out anymore, we give up
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
226 break;
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
227 }
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
228 }
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
229 return nitems - remaining;
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
230 }
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
231
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
232 size_t cxBufferWrite(
890
54565fd74e74 move all const keywords to the west - fixes #426
Mike Becker <universe@uap-core.de>
parents: 761
diff changeset
233 const void *ptr,
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
234 size_t size,
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
235 size_t nitems,
500
eb9e7bd40a8e do not hide pointers behind typedefs
Mike Becker <universe@uap-core.de>
parents: 489
diff changeset
236 CxBuffer *buffer
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
237 ) {
543
7b9114030ca4 optimization for buffer write easy cases
Mike Becker <universe@uap-core.de>
parents: 542
diff changeset
238 // optimize for easy case
7b9114030ca4 optimization for buffer write easy cases
Mike Becker <universe@uap-core.de>
parents: 542
diff changeset
239 if (size == 1 && (buffer->capacity - buffer->pos) >= nitems) {
1028
3e4905241838 add copy-on-extend feature to UCX buffer - fixes #533
Mike Becker <universe@uap-core.de>
parents: 1024
diff changeset
240 if (buffer_copy_on_write(buffer)) return 0;
543
7b9114030ca4 optimization for buffer write easy cases
Mike Becker <universe@uap-core.de>
parents: 542
diff changeset
241 memcpy(buffer->bytes + buffer->pos, ptr, nitems);
7b9114030ca4 optimization for buffer write easy cases
Mike Becker <universe@uap-core.de>
parents: 542
diff changeset
242 buffer->pos += nitems;
7b9114030ca4 optimization for buffer write easy cases
Mike Becker <universe@uap-core.de>
parents: 542
diff changeset
243 if (buffer->pos > buffer->size) {
7b9114030ca4 optimization for buffer write easy cases
Mike Becker <universe@uap-core.de>
parents: 542
diff changeset
244 buffer->size = buffer->pos;
7b9114030ca4 optimization for buffer write easy cases
Mike Becker <universe@uap-core.de>
parents: 542
diff changeset
245 }
7b9114030ca4 optimization for buffer write easy cases
Mike Becker <universe@uap-core.de>
parents: 542
diff changeset
246 return nitems;
7b9114030ca4 optimization for buffer write easy cases
Mike Becker <universe@uap-core.de>
parents: 542
diff changeset
247 }
7b9114030ca4 optimization for buffer write easy cases
Mike Becker <universe@uap-core.de>
parents: 542
diff changeset
248
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
249 size_t len;
544
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
250 size_t nitems_out = nitems;
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
251 if (cx_szmul(size, nitems, &len)) {
1040
1ecf4dbbc60c add some more overflow treatment and make sure to set errno properly
Mike Becker <universe@uap-core.de>
parents: 1030
diff changeset
252 errno = EOVERFLOW;
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
253 return 0;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
254 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
255 size_t required = buffer->pos + len;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
256 if (buffer->pos > required) {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
257 return 0;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
258 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
259
539
9cd98da9ee17 #184 start implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 538
diff changeset
260 bool perform_flush = false;
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
261 if (required > buffer->capacity) {
1024
8f99f6c28bd3 add copy-on-write feature to UCX buffer - fixes #531
Mike Becker <universe@uap-core.de>
parents: 1007
diff changeset
262 if (buffer->flags & CX_BUFFER_AUTO_EXTEND) {
539
9cd98da9ee17 #184 start implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 538
diff changeset
263 if (buffer->flush_blkmax > 0 && required > buffer->flush_threshold) {
9cd98da9ee17 #184 start implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 538
diff changeset
264 perform_flush = true;
9cd98da9ee17 #184 start implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 538
diff changeset
265 } else {
9cd98da9ee17 #184 start implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 538
diff changeset
266 if (cxBufferMinimumCapacity(buffer, required)) {
9cd98da9ee17 #184 start implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 538
diff changeset
267 return 0;
9cd98da9ee17 #184 start implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 538
diff changeset
268 }
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
269 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
270 } else {
539
9cd98da9ee17 #184 start implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 538
diff changeset
271 if (buffer->flush_blkmax > 0) {
9cd98da9ee17 #184 start implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 538
diff changeset
272 perform_flush = true;
9cd98da9ee17 #184 start implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 538
diff changeset
273 } else {
9cd98da9ee17 #184 start implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 538
diff changeset
274 // truncate data to be written, if we can neither extend nor flush
9cd98da9ee17 #184 start implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 538
diff changeset
275 len = buffer->capacity - buffer->pos;
9cd98da9ee17 #184 start implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 538
diff changeset
276 if (size > 1) {
9cd98da9ee17 #184 start implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 538
diff changeset
277 len -= len % size;
9cd98da9ee17 #184 start implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 538
diff changeset
278 }
544
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
279 nitems_out = len / size;
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
280 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
281 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
282 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
283
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
284 if (len == 0) {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
285 return len;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
286 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
287
539
9cd98da9ee17 #184 start implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 538
diff changeset
288 if (perform_flush) {
544
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
289 size_t flush_max;
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
290 if (cx_szmul(buffer->flush_blkmax, buffer->flush_blksize, &flush_max)) {
1040
1ecf4dbbc60c add some more overflow treatment and make sure to set errno properly
Mike Becker <universe@uap-core.de>
parents: 1030
diff changeset
291 errno = EOVERFLOW;
544
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
292 return 0;
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
293 }
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
294 size_t flush_pos = buffer->flush_func == NULL || buffer->flush_target == NULL
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
295 ? buffer->pos
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
296 : cx_buffer_write_flush_helper(buffer, buffer->bytes, 1, buffer->pos);
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
297 if (flush_pos == buffer->pos) {
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
298 // entire buffer has been flushed, we can reset
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
299 buffer->size = buffer->pos = 0;
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
300
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
301 size_t items_flush; // how many items can also be directly flushed
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
302 size_t items_keep; // how many items have to be written to the buffer
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
303
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
304 items_flush = flush_max >= required ? nitems : (flush_max - flush_pos) / size;
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
305 if (items_flush > 0) {
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
306 items_flush = cx_buffer_write_flush_helper(buffer, ptr, size, items_flush / size);
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
307 // in case we could not flush everything, keep the rest
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
308 }
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
309 items_keep = nitems - items_flush;
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
310 if (items_keep > 0) {
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
311 // try again with the remaining stuff
890
54565fd74e74 move all const keywords to the west - fixes #426
Mike Becker <universe@uap-core.de>
parents: 761
diff changeset
312 const unsigned char *new_ptr = ptr;
544
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
313 new_ptr += items_flush * size;
567
f90a7cfe2480 #184 #170 more thorough flush testing
Mike Becker <universe@uap-core.de>
parents: 544
diff changeset
314 // report the directly flushed items as written plus the remaining stuff
f90a7cfe2480 #184 #170 more thorough flush testing
Mike Becker <universe@uap-core.de>
parents: 544
diff changeset
315 return items_flush + cxBufferWrite(new_ptr, size, items_keep, buffer);
544
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
316 } else {
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
317 // all items have been flushed - report them as written
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
318 return nitems;
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
319 }
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
320 } else if (flush_pos == 0) {
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
321 // nothing could be flushed at all, we immediately give up without writing any data
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
322 return 0;
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
323 } else {
567
f90a7cfe2480 #184 #170 more thorough flush testing
Mike Becker <universe@uap-core.de>
parents: 544
diff changeset
324 // we were partially successful, we shift left and try again
544
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
325 cxBufferShiftLeft(buffer, flush_pos);
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
326 return cxBufferWrite(ptr, size, nitems, buffer);
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
327 }
539
9cd98da9ee17 #184 start implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 538
diff changeset
328 } else {
1028
3e4905241838 add copy-on-extend feature to UCX buffer - fixes #533
Mike Becker <universe@uap-core.de>
parents: 1024
diff changeset
329 if (buffer_copy_on_write(buffer)) return 0;
539
9cd98da9ee17 #184 start implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 538
diff changeset
330 memcpy(buffer->bytes + buffer->pos, ptr, len);
9cd98da9ee17 #184 start implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 538
diff changeset
331 buffer->pos += len;
9cd98da9ee17 #184 start implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 538
diff changeset
332 if (buffer->pos > buffer->size) {
9cd98da9ee17 #184 start implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 538
diff changeset
333 buffer->size = buffer->pos;
9cd98da9ee17 #184 start implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 538
diff changeset
334 }
544
2e73456e5f84 #184 untested implementation of the flush feature
Mike Becker <universe@uap-core.de>
parents: 543
diff changeset
335 return nitems_out;
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
336 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
337
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
338 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
339
1030
06091e067bee add cxBufferAppend() - fixes #534
Mike Becker <universe@uap-core.de>
parents: 1028
diff changeset
340 size_t cxBufferAppend(
06091e067bee add cxBufferAppend() - fixes #534
Mike Becker <universe@uap-core.de>
parents: 1028
diff changeset
341 const void *ptr,
06091e067bee add cxBufferAppend() - fixes #534
Mike Becker <universe@uap-core.de>
parents: 1028
diff changeset
342 size_t size,
06091e067bee add cxBufferAppend() - fixes #534
Mike Becker <universe@uap-core.de>
parents: 1028
diff changeset
343 size_t nitems,
06091e067bee add cxBufferAppend() - fixes #534
Mike Becker <universe@uap-core.de>
parents: 1028
diff changeset
344 CxBuffer *buffer
06091e067bee add cxBufferAppend() - fixes #534
Mike Becker <universe@uap-core.de>
parents: 1028
diff changeset
345 ) {
06091e067bee add cxBufferAppend() - fixes #534
Mike Becker <universe@uap-core.de>
parents: 1028
diff changeset
346 size_t pos = buffer->pos;
06091e067bee add cxBufferAppend() - fixes #534
Mike Becker <universe@uap-core.de>
parents: 1028
diff changeset
347 buffer->pos = buffer->size;
06091e067bee add cxBufferAppend() - fixes #534
Mike Becker <universe@uap-core.de>
parents: 1028
diff changeset
348 size_t written = cxBufferWrite(ptr, size, nitems, buffer);
06091e067bee add cxBufferAppend() - fixes #534
Mike Becker <universe@uap-core.de>
parents: 1028
diff changeset
349 buffer->pos = pos;
06091e067bee add cxBufferAppend() - fixes #534
Mike Becker <universe@uap-core.de>
parents: 1028
diff changeset
350 return written;
06091e067bee add cxBufferAppend() - fixes #534
Mike Becker <universe@uap-core.de>
parents: 1028
diff changeset
351 }
06091e067bee add cxBufferAppend() - fixes #534
Mike Becker <universe@uap-core.de>
parents: 1028
diff changeset
352
538
2cfbcbe86a7c #170 first basic write tests
Mike Becker <universe@uap-core.de>
parents: 536
diff changeset
353 int cxBufferPut(
2cfbcbe86a7c #170 first basic write tests
Mike Becker <universe@uap-core.de>
parents: 536
diff changeset
354 CxBuffer *buffer,
2cfbcbe86a7c #170 first basic write tests
Mike Becker <universe@uap-core.de>
parents: 536
diff changeset
355 int c
2cfbcbe86a7c #170 first basic write tests
Mike Becker <universe@uap-core.de>
parents: 536
diff changeset
356 ) {
2cfbcbe86a7c #170 first basic write tests
Mike Becker <universe@uap-core.de>
parents: 536
diff changeset
357 c &= 0xFF;
2cfbcbe86a7c #170 first basic write tests
Mike Becker <universe@uap-core.de>
parents: 536
diff changeset
358 unsigned char const ch = c;
2cfbcbe86a7c #170 first basic write tests
Mike Becker <universe@uap-core.de>
parents: 536
diff changeset
359 if (cxBufferWrite(&ch, 1, 1, buffer) == 1) {
2cfbcbe86a7c #170 first basic write tests
Mike Becker <universe@uap-core.de>
parents: 536
diff changeset
360 return c;
2cfbcbe86a7c #170 first basic write tests
Mike Becker <universe@uap-core.de>
parents: 536
diff changeset
361 } else {
2cfbcbe86a7c #170 first basic write tests
Mike Becker <universe@uap-core.de>
parents: 536
diff changeset
362 return EOF;
2cfbcbe86a7c #170 first basic write tests
Mike Becker <universe@uap-core.de>
parents: 536
diff changeset
363 }
2cfbcbe86a7c #170 first basic write tests
Mike Becker <universe@uap-core.de>
parents: 536
diff changeset
364 }
2cfbcbe86a7c #170 first basic write tests
Mike Becker <universe@uap-core.de>
parents: 536
diff changeset
365
1005
67fa386ce600 add cxBufferTerminate()
Mike Becker <universe@uap-core.de>
parents: 1004
diff changeset
366 int cxBufferTerminate(CxBuffer *buffer) {
67fa386ce600 add cxBufferTerminate()
Mike Becker <universe@uap-core.de>
parents: 1004
diff changeset
367 bool success = 0 == cxBufferPut(buffer, 0);
67fa386ce600 add cxBufferTerminate()
Mike Becker <universe@uap-core.de>
parents: 1004
diff changeset
368 if (success) {
67fa386ce600 add cxBufferTerminate()
Mike Becker <universe@uap-core.de>
parents: 1004
diff changeset
369 buffer->pos--;
67fa386ce600 add cxBufferTerminate()
Mike Becker <universe@uap-core.de>
parents: 1004
diff changeset
370 buffer->size--;
67fa386ce600 add cxBufferTerminate()
Mike Becker <universe@uap-core.de>
parents: 1004
diff changeset
371 return 0;
67fa386ce600 add cxBufferTerminate()
Mike Becker <universe@uap-core.de>
parents: 1004
diff changeset
372 } else {
1024
8f99f6c28bd3 add copy-on-write feature to UCX buffer - fixes #531
Mike Becker <universe@uap-core.de>
parents: 1007
diff changeset
373 return -1;
1005
67fa386ce600 add cxBufferTerminate()
Mike Becker <universe@uap-core.de>
parents: 1004
diff changeset
374 }
67fa386ce600 add cxBufferTerminate()
Mike Becker <universe@uap-core.de>
parents: 1004
diff changeset
375 }
67fa386ce600 add cxBufferTerminate()
Mike Becker <universe@uap-core.de>
parents: 1004
diff changeset
376
538
2cfbcbe86a7c #170 first basic write tests
Mike Becker <universe@uap-core.de>
parents: 536
diff changeset
377 size_t cxBufferPutString(
2cfbcbe86a7c #170 first basic write tests
Mike Becker <universe@uap-core.de>
parents: 536
diff changeset
378 CxBuffer *buffer,
2cfbcbe86a7c #170 first basic write tests
Mike Becker <universe@uap-core.de>
parents: 536
diff changeset
379 const char *str
2cfbcbe86a7c #170 first basic write tests
Mike Becker <universe@uap-core.de>
parents: 536
diff changeset
380 ) {
2cfbcbe86a7c #170 first basic write tests
Mike Becker <universe@uap-core.de>
parents: 536
diff changeset
381 return cxBufferWrite(str, 1, strlen(str), buffer);
2cfbcbe86a7c #170 first basic write tests
Mike Becker <universe@uap-core.de>
parents: 536
diff changeset
382 }
2cfbcbe86a7c #170 first basic write tests
Mike Becker <universe@uap-core.de>
parents: 536
diff changeset
383
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
384 size_t cxBufferRead(
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
385 void *ptr,
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
386 size_t size,
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
387 size_t nitems,
500
eb9e7bd40a8e do not hide pointers behind typedefs
Mike Becker <universe@uap-core.de>
parents: 489
diff changeset
388 CxBuffer *buffer
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
389 ) {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
390 size_t len;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
391 if (cx_szmul(size, nitems, &len)) {
1040
1ecf4dbbc60c add some more overflow treatment and make sure to set errno properly
Mike Becker <universe@uap-core.de>
parents: 1030
diff changeset
392 errno = EOVERFLOW;
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
393 return 0;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
394 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
395 if (buffer->pos + len > buffer->size) {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
396 len = buffer->size - buffer->pos;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
397 if (size > 1) len -= len % size;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
398 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
399
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
400 if (len <= 0) {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
401 return len;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
402 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
403
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
404 memcpy(ptr, buffer->bytes + buffer->pos, len);
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
405 buffer->pos += len;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
406
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
407 return len / size;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
408 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
409
500
eb9e7bd40a8e do not hide pointers behind typedefs
Mike Becker <universe@uap-core.de>
parents: 489
diff changeset
410 int cxBufferGet(CxBuffer *buffer) {
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
411 if (cxBufferEof(buffer)) {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
412 return EOF;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
413 } else {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
414 int c = buffer->bytes[buffer->pos];
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
415 buffer->pos++;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
416 return c;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
417 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
418 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
419
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
420 int cxBufferShiftLeft(
500
eb9e7bd40a8e do not hide pointers behind typedefs
Mike Becker <universe@uap-core.de>
parents: 489
diff changeset
421 CxBuffer *buffer,
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
422 size_t shift
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
423 ) {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
424 if (shift >= buffer->size) {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
425 buffer->pos = buffer->size = 0;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
426 } else {
1028
3e4905241838 add copy-on-extend feature to UCX buffer - fixes #533
Mike Becker <universe@uap-core.de>
parents: 1024
diff changeset
427 if (buffer_copy_on_write(buffer)) return -1;
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
428 memmove(buffer->bytes, buffer->bytes + shift, buffer->size - shift);
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
429 buffer->size -= shift;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
430
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
431 if (buffer->pos >= shift) {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
432 buffer->pos -= shift;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
433 } else {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
434 buffer->pos = 0;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
435 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
436 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
437 return 0;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
438 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
439
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
440 int cxBufferShiftRight(
500
eb9e7bd40a8e do not hide pointers behind typedefs
Mike Becker <universe@uap-core.de>
parents: 489
diff changeset
441 CxBuffer *buffer,
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
442 size_t shift
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
443 ) {
1040
1ecf4dbbc60c add some more overflow treatment and make sure to set errno properly
Mike Becker <universe@uap-core.de>
parents: 1030
diff changeset
444 if (buffer->size > SIZE_MAX - shift) {
1ecf4dbbc60c add some more overflow treatment and make sure to set errno properly
Mike Becker <universe@uap-core.de>
parents: 1030
diff changeset
445 errno = EOVERFLOW;
1ecf4dbbc60c add some more overflow treatment and make sure to set errno properly
Mike Becker <universe@uap-core.de>
parents: 1030
diff changeset
446 return -1;
1ecf4dbbc60c add some more overflow treatment and make sure to set errno properly
Mike Becker <universe@uap-core.de>
parents: 1030
diff changeset
447 }
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
448 size_t req_capacity = buffer->size + shift;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
449 size_t movebytes;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
450
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
451 // auto extend buffer, if required and enabled
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
452 if (buffer->capacity < req_capacity) {
1024
8f99f6c28bd3 add copy-on-write feature to UCX buffer - fixes #531
Mike Becker <universe@uap-core.de>
parents: 1007
diff changeset
453 if (buffer->flags & CX_BUFFER_AUTO_EXTEND) {
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
454 if (cxBufferMinimumCapacity(buffer, req_capacity)) {
1024
8f99f6c28bd3 add copy-on-write feature to UCX buffer - fixes #531
Mike Becker <universe@uap-core.de>
parents: 1007
diff changeset
455 return -1;
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
456 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
457 movebytes = buffer->size;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
458 } else {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
459 movebytes = buffer->capacity - shift;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
460 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
461 } else {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
462 movebytes = buffer->size;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
463 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
464
1024
8f99f6c28bd3 add copy-on-write feature to UCX buffer - fixes #531
Mike Becker <universe@uap-core.de>
parents: 1007
diff changeset
465 if (movebytes > 0) {
1028
3e4905241838 add copy-on-extend feature to UCX buffer - fixes #533
Mike Becker <universe@uap-core.de>
parents: 1024
diff changeset
466 if (buffer_copy_on_write(buffer)) return -1;
1024
8f99f6c28bd3 add copy-on-write feature to UCX buffer - fixes #531
Mike Becker <universe@uap-core.de>
parents: 1007
diff changeset
467 memmove(buffer->bytes + shift, buffer->bytes, movebytes);
8f99f6c28bd3 add copy-on-write feature to UCX buffer - fixes #531
Mike Becker <universe@uap-core.de>
parents: 1007
diff changeset
468 buffer->size = shift + movebytes;
8f99f6c28bd3 add copy-on-write feature to UCX buffer - fixes #531
Mike Becker <universe@uap-core.de>
parents: 1007
diff changeset
469 }
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
470
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
471 buffer->pos += shift;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
472 if (buffer->pos > buffer->size) {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
473 buffer->pos = buffer->size;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
474 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
475
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
476 return 0;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
477 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
478
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
479 int cxBufferShift(
500
eb9e7bd40a8e do not hide pointers behind typedefs
Mike Becker <universe@uap-core.de>
parents: 489
diff changeset
480 CxBuffer *buffer,
483
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
481 off_t shift
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
482 ) {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
483 if (shift < 0) {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
484 return cxBufferShiftLeft(buffer, (size_t) (-shift));
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
485 } else if (shift > 0) {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
486 return cxBufferShiftRight(buffer, (size_t) shift);
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
487 } else {
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
488 return 0;
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
489 }
929016224c3c add ported UCX buffer implementation
Mike Becker <universe@uap-core.de>
parents:
diff changeset
490 }

mercurial