libjeffpc: buffer.c annotate

annotate buffer.c @ 849:1c4d7ff0a682

buffer: add buffer_insert & buffer_insert_c Like appending, but at any offset - not just at the end of existing data. Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>

author	Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
date	Thu, 16 Sep 2021 22:39:12 -0400
parents	3fa2ebce953c
children	3a53836f2274

rev	line source
250 0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	1 /*
849 1c4d7ff0a682 buffer: add buffer_insert & buffer_insert_c Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 828 diff changeset	2 * Copyright (c) 2017-2021 Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
250 0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	3 *
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	4 * Permission is hereby granted, free of charge, to any person obtaining a copy
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	5 * of this software and associated documentation files (the "Software"), to deal
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	6 * in the Software without restriction, including without limitation the rights
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	8 * copies of the Software, and to permit persons to whom the Software is
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	9 * furnished to do so, subject to the following conditions:
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	10 *
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	11 * The above copyright notice and this permission notice shall be included in
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	12 * all copies or substantial portions of the Software.
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	13 *
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	20 * SOFTWARE.
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	21 */
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	22
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	23 #include <stdbool.h>
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	24
260 8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	25 #include <jeffpc/int.h>
8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	26
256 f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	27 #include "buffer_impl.h"
250 0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	28
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	29 struct buffer *buffer_alloc(size_t expected_size)
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	30 {
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	31 struct buffer *buffer;
798 29db876d8157 buffer: add buffer_init_heap to support stack allocated heap buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 797 diff changeset	32 int ret;
250 0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	33
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	34 buffer = malloc(sizeof(struct buffer));
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	35 if (!buffer)
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	36 return ERR_PTR(-ENOMEM);
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	37
798 29db876d8157 buffer: add buffer_init_heap to support stack allocated heap buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 797 diff changeset	38 ret = buffer_init_heap(buffer, expected_size);
29db876d8157 buffer: add buffer_init_heap to support stack allocated heap buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 797 diff changeset	39 if (ret) {
250 0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	40 free(buffer);
798 29db876d8157 buffer: add buffer_init_heap to support stack allocated heap buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 797 diff changeset	41 return ERR_PTR(ret);
250 0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	42 }
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	43
797 4c0939533a78 buffer: allow buffer_free calls on stack allocated buffer structures Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 752 diff changeset	44 buffer->heap = true;
250 0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	45
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	46 return buffer;
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	47 }
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	48
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	49 void buffer_free(struct buffer *buffer)
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	50 {
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	51 if (!buffer)
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	52 return;
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	53
256 f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	54 if (buffer->ops->free)
f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	55 buffer->ops->free(buffer->data);
f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	56
797 4c0939533a78 buffer: allow buffer_free calls on stack allocated buffer structures Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 752 diff changeset	57 if (buffer->heap)
4c0939533a78 buffer: allow buffer_free calls on stack allocated buffer structures Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 752 diff changeset	58 free(buffer);
250 0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	59 }
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	60
798 29db876d8157 buffer: add buffer_init_heap to support stack allocated heap buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 797 diff changeset	61 int buffer_init_heap(struct buffer *buffer, size_t expected_size)
29db876d8157 buffer: add buffer_init_heap to support stack allocated heap buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 797 diff changeset	62 {
29db876d8157 buffer: add buffer_init_heap to support stack allocated heap buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 797 diff changeset	63 buffer->data = malloc(expected_size ? expected_size : 1);
29db876d8157 buffer: add buffer_init_heap to support stack allocated heap buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 797 diff changeset	64 if (!buffer->data)
29db876d8157 buffer: add buffer_init_heap to support stack allocated heap buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 797 diff changeset	65 return -ENOMEM;
29db876d8157 buffer: add buffer_init_heap to support stack allocated heap buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 797 diff changeset	66
29db876d8157 buffer: add buffer_init_heap to support stack allocated heap buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 797 diff changeset	67 buffer->off = 0;
29db876d8157 buffer: add buffer_init_heap to support stack allocated heap buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 797 diff changeset	68 buffer->size = 0;
29db876d8157 buffer: add buffer_init_heap to support stack allocated heap buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 797 diff changeset	69 buffer->allocsize = expected_size;
29db876d8157 buffer: add buffer_init_heap to support stack allocated heap buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 797 diff changeset	70 buffer->ops = &heap_buffer;
29db876d8157 buffer: add buffer_init_heap to support stack allocated heap buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 797 diff changeset	71 buffer->heap = false;
29db876d8157 buffer: add buffer_init_heap to support stack allocated heap buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 797 diff changeset	72
29db876d8157 buffer: add buffer_init_heap to support stack allocated heap buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 797 diff changeset	73 return 0;
29db876d8157 buffer: add buffer_init_heap to support stack allocated heap buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 797 diff changeset	74 }
29db876d8157 buffer: add buffer_init_heap to support stack allocated heap buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 797 diff changeset	75
251 5f9eebf77662 buffer: add a sinkhole buffer type Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 250 diff changeset	76 void buffer_init_sink(struct buffer *buffer)
5f9eebf77662 buffer: add a sinkhole buffer type Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 250 diff changeset	77 {
5f9eebf77662 buffer: add a sinkhole buffer type Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 250 diff changeset	78 buffer->data = NULL;
260 8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	79 buffer->off = 0;
712 8295148e8f44 buffer: rename internal 'used' member to a more obvious name Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 710 diff changeset	80 buffer->size = 0;
251 5f9eebf77662 buffer: add a sinkhole buffer type Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 250 diff changeset	81 buffer->allocsize = SIZE_MAX;
256 f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	82 buffer->ops = &sink_buffer;
797 4c0939533a78 buffer: allow buffer_free calls on stack allocated buffer structures Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 752 diff changeset	83 buffer->heap = false;
254 de0709ff0895 buffer: add a borrowed-const-data buffer type Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 251 diff changeset	84 }
de0709ff0895 buffer: add a borrowed-const-data buffer type Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 251 diff changeset	85
563 bc0841b964fb buffer: combine implementations of const and static buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 562 diff changeset	86 void buffer_init_static(struct buffer buffer, const void data, size_t size,
799 6371fb111e27 buffer: add buffer size argument to buffer_init_static Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 798 diff changeset	87 size_t bufsize, bool writable)
254 de0709ff0895 buffer: add a borrowed-const-data buffer type Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 251 diff changeset	88 {
799 6371fb111e27 buffer: add buffer size argument to buffer_init_static Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 798 diff changeset	89 ASSERT3U(size, <=, bufsize);
6371fb111e27 buffer: add buffer size argument to buffer_init_static Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 798 diff changeset	90
254 de0709ff0895 buffer: add a borrowed-const-data buffer type Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 251 diff changeset	91 buffer->data = (void *) data;
260 8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	92 buffer->off = 0;
712 8295148e8f44 buffer: rename internal 'used' member to a more obvious name Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 710 diff changeset	93 buffer->size = size;
799 6371fb111e27 buffer: add buffer size argument to buffer_init_static Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 798 diff changeset	94 buffer->allocsize = bufsize;
563 bc0841b964fb buffer: combine implementations of const and static buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 562 diff changeset	95 buffer->ops = writable ? &static_buffer_rw : &static_buffer_ro;
797 4c0939533a78 buffer: allow buffer_free calls on stack allocated buffer structures Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 752 diff changeset	96 buffer->heap = false;
562 584def85123e buffer: introduce a static read-write buffer type Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 442 diff changeset	97 }
584def85123e buffer: introduce a static read-write buffer type Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 442 diff changeset	98
250 0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	99 static int resize(struct buffer *buffer, size_t newsize)
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	100 {
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	101 void *tmp;
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	102
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	103 if (newsize <= buffer->allocsize)
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	104 return 0;
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	105
256 f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	106 if (!buffer->ops->realloc)
f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	107 return -ENOTSUP;
f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	108
f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	109 tmp = buffer->ops->realloc(buffer->data, newsize);
250 0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	110 if (!tmp)
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	111 return -ENOMEM;
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	112
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	113 buffer->data = tmp;
256 f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	114 buffer->allocsize = newsize;
250 0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	115
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	116 return 0;
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	117 }
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	118
849 1c4d7ff0a682 buffer: add buffer_insert & buffer_insert_c Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 828 diff changeset	119 int buffer_insert(struct buffer buffer, const void data, size_t size,
1c4d7ff0a682 buffer: add buffer_insert & buffer_insert_c Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 828 diff changeset	120 size_t off)
250 0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	121 {
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	122 int ret;
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	123
256 f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	124 if (!buffer)
f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	125 return -EINVAL;
f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	126
278 47df3cfdeca7 buffer: allow zero length append Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 261 diff changeset	127 if (!data && size)
250 0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	128 return -EINVAL;
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	129
849 1c4d7ff0a682 buffer: add buffer_insert & buffer_insert_c Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 828 diff changeset	130 if (buffer->ops->check_insert) {
1c4d7ff0a682 buffer: add buffer_insert & buffer_insert_c Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 828 diff changeset	131 ret = buffer->ops->check_insert(buffer, data, size, off);
256 f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	132 if (ret)
f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	133 return ret;
f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	134 }
f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	135
849 1c4d7ff0a682 buffer: add buffer_insert & buffer_insert_c Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 828 diff changeset	136 if (off > buffer->size)
1c4d7ff0a682 buffer: add buffer_insert & buffer_insert_c Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 828 diff changeset	137 return -EINVAL; /* can't insert past EOF */
1c4d7ff0a682 buffer: add buffer_insert & buffer_insert_c Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 828 diff changeset	138
278 47df3cfdeca7 buffer: allow zero length append Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 261 diff changeset	139 if (!size)
849 1c4d7ff0a682 buffer: add buffer_insert & buffer_insert_c Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 828 diff changeset	140 return 0; /* insert(..., 0, ...) is a no-op */
250 0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	141
712 8295148e8f44 buffer: rename internal 'used' member to a more obvious name Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 710 diff changeset	142 ret = resize(buffer, buffer->size + size);
256 f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	143 if (ret)
f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	144 return ret;
250 0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	145
849 1c4d7ff0a682 buffer: add buffer_insert & buffer_insert_c Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 828 diff changeset	146 if (off < buffer->size)
1c4d7ff0a682 buffer: add buffer_insert & buffer_insert_c Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 828 diff changeset	147 buffer->ops->move(buffer, off + size, off, buffer->size - off);
1c4d7ff0a682 buffer: add buffer_insert & buffer_insert_c Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 828 diff changeset	148
1c4d7ff0a682 buffer: add buffer_insert & buffer_insert_c Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 828 diff changeset	149 buffer->ops->copyin(buffer, off, data, size);
250 0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	150
712 8295148e8f44 buffer: rename internal 'used' member to a more obvious name Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 710 diff changeset	151 buffer->size += size;
250 0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	152
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	153 return 0;
0e4e45813eb9 buffer: introduce a simple growing memory buffer API Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: diff changeset	154 }
256 f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	155
817 013adc5c54dd buffer: add function to copy between two buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 799 diff changeset	156 int buffer_copy(struct buffer dst, struct buffer src, size_t len)
013adc5c54dd buffer: add function to copy between two buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 799 diff changeset	157 {
013adc5c54dd buffer: add function to copy between two buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 799 diff changeset	158 /*
013adc5c54dd buffer: add function to copy between two buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 799 diff changeset	159 * TODO: we could make this more efficient by growing the
013adc5c54dd buffer: add function to copy between two buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 799 diff changeset	160 * destination buffer only once
013adc5c54dd buffer: add function to copy between two buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 799 diff changeset	161 */
013adc5c54dd buffer: add function to copy between two buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 799 diff changeset	162
013adc5c54dd buffer: add function to copy between two buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 799 diff changeset	163 while (len) {
013adc5c54dd buffer: add function to copy between two buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 799 diff changeset	164 uint8_t tmp[4096];
013adc5c54dd buffer: add function to copy between two buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 799 diff changeset	165 ssize_t ret;
013adc5c54dd buffer: add function to copy between two buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 799 diff changeset	166
013adc5c54dd buffer: add function to copy between two buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 799 diff changeset	167 /* read in a bunch */
013adc5c54dd buffer: add function to copy between two buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 799 diff changeset	168 ret = buffer_read(src, tmp, MIN(sizeof(tmp), len));
013adc5c54dd buffer: add function to copy between two buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 799 diff changeset	169 if (ret < 0)
013adc5c54dd buffer: add function to copy between two buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 799 diff changeset	170 return ret;
013adc5c54dd buffer: add function to copy between two buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 799 diff changeset	171
013adc5c54dd buffer: add function to copy between two buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 799 diff changeset	172 /* decrement now, so we can reuse ret below */
013adc5c54dd buffer: add function to copy between two buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 799 diff changeset	173 len -= ret;
013adc5c54dd buffer: add function to copy between two buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 799 diff changeset	174
013adc5c54dd buffer: add function to copy between two buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 799 diff changeset	175 /* and append whatever we read */
013adc5c54dd buffer: add function to copy between two buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 799 diff changeset	176 ret = buffer_append(dst, tmp, ret);
013adc5c54dd buffer: add function to copy between two buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 799 diff changeset	177 if (ret)
013adc5c54dd buffer: add function to copy between two buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 799 diff changeset	178 return ret;
013adc5c54dd buffer: add function to copy between two buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 799 diff changeset	179 }
013adc5c54dd buffer: add function to copy between two buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 799 diff changeset	180
013adc5c54dd buffer: add function to copy between two buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 799 diff changeset	181 return 0;
013adc5c54dd buffer: add function to copy between two buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 799 diff changeset	182 }
013adc5c54dd buffer: add function to copy between two buffers Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 799 diff changeset	183
260 8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	184 ssize_t buffer_seek(struct buffer *buffer, off_t offset, int whence)
8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	185 {
8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	186 size_t newoff;
8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	187
8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	188 if (!buffer)
8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	189 return -EINVAL;
8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	190
8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	191 switch (whence) {
8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	192 case SEEK_SET:
8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	193 if (offset < 0)
8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	194 return -EINVAL;
712 8295148e8f44 buffer: rename internal 'used' member to a more obvious name Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 710 diff changeset	195 if (offset > buffer->size)
260 8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	196 return -EINVAL;
8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	197
8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	198 newoff = offset;
8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	199 break;
8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	200 case SEEK_CUR:
8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	201 if ((offset > 0) &&
712 8295148e8f44 buffer: rename internal 'used' member to a more obvious name Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 710 diff changeset	202 (offset > (buffer->size - buffer->off)))
260 8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	203 return -EINVAL;
8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	204 if ((offset < 0) && (-offset > buffer->off))
8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	205 return -EINVAL;
8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	206
8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	207 newoff = buffer->off + offset;
8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	208 break;
8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	209 case SEEK_END:
8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	210 if (offset > 0)
8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	211 return -EINVAL;
712 8295148e8f44 buffer: rename internal 'used' member to a more obvious name Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 710 diff changeset	212 if (-offset > buffer->size)
260 8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	213 return -EINVAL;
8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	214
751 4e141f41f8f1 buffer: correct buffer_seek(..., SEEK_END) offset calculation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 712 diff changeset	215 newoff = buffer->size + offset;
260 8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	216 break;
8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	217 default:
8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	218 return -EINVAL;
8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	219 }
8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	220
8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	221 if (newoff > SSIZE_MAX)
8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	222 return -EOVERFLOW;
8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	223
440 df90b1b883d8 buffer: allow implementations to refuse seeks Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 278 diff changeset	224 if (buffer->ops->check_seek) {
df90b1b883d8 buffer: allow implementations to refuse seeks Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 278 diff changeset	225 ssize_t ret;
df90b1b883d8 buffer: allow implementations to refuse seeks Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 278 diff changeset	226
df90b1b883d8 buffer: allow implementations to refuse seeks Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 278 diff changeset	227 ret = buffer->ops->check_seek(buffer, offset, whence, newoff);
df90b1b883d8 buffer: allow implementations to refuse seeks Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 278 diff changeset	228 if (ret)
df90b1b883d8 buffer: allow implementations to refuse seeks Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 278 diff changeset	229 return ret;
df90b1b883d8 buffer: allow implementations to refuse seeks Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 278 diff changeset	230 }
df90b1b883d8 buffer: allow implementations to refuse seeks Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 278 diff changeset	231
260 8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	232 buffer->off = newoff;
8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	233
8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	234 return newoff;
8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	235 }
8e6dcacf8620 buffer: implement the concept of seeking in a buffer Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 256 diff changeset	236
261 6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	237 int buffer_truncate(struct buffer *buffer, size_t size)
6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	238 {
6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	239 int ret;
6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	240
6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	241 if (!buffer)
6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	242 return -EINVAL;
6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	243
6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	244 if (buffer->ops->check_truncate) {
6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	245 ret = buffer->ops->check_truncate(buffer, size);
6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	246 if (ret)
6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	247 return ret;
6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	248 }
6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	249
6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	250 ret = resize(buffer, size);
6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	251 if (ret)
6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	252 return ret;
6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	253
630 28dcffaf40b5 buffer: add a comment explaining the call to clear in truncate Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 629 diff changeset	254 /* clear any expansion */
712 8295148e8f44 buffer: rename internal 'used' member to a more obvious name Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 710 diff changeset	255 if (buffer->size < size)
8295148e8f44 buffer: rename internal 'used' member to a more obvious name Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 710 diff changeset	256 buffer->ops->clear(buffer, buffer->size, size - buffer->size);
261 6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	257
712 8295148e8f44 buffer: rename internal 'used' member to a more obvious name Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 710 diff changeset	258 buffer->size = size;
752 b9db76d1dd5b buffer: move buffer offset on truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 751 diff changeset	259 buffer->off = MIN(buffer->off, size);
261 6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	260
6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	261 return 0;
6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	262 }
6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	263
611 0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	264 ssize_t buffer_pread(struct buffer buffer, void buf, size_t len, size_t off)
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	265 {
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	266 ssize_t ret;
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	267
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	268 if (!buffer \|\| !buf)
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	269 return -EINVAL;
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	270
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	271 if (buffer->ops->check_read) {
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	272 ret = buffer->ops->check_read(buffer, buf, len, off);
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	273 if (ret)
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	274 return ret;
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	275 }
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	276
712 8295148e8f44 buffer: rename internal 'used' member to a more obvious name Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 710 diff changeset	277 if (off >= buffer->size)
611 0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	278 ret = 0;
712 8295148e8f44 buffer: rename internal 'used' member to a more obvious name Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 710 diff changeset	279 else if ((off + len) > buffer->size)
8295148e8f44 buffer: rename internal 'used' member to a more obvious name Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 710 diff changeset	280 ret = buffer->size - off;
611 0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	281 else
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	282 ret = len;
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	283
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	284 if (ret)
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	285 buffer->ops->copyout(buffer, off, buf, ret);
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	286
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	287 return ret;
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	288 }
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	289
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	290 ssize_t buffer_pwrite(struct buffer buffer, const void buf, size_t len,
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	291 size_t off)
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	292 {
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	293 ssize_t ret;
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	294
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	295 if (!buffer \|\| !buf)
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	296 return -EINVAL;
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	297
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	298 if (buffer->ops->check_write) {
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	299 ret = buffer->ops->check_write(buffer, buf, len, off);
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	300 if (ret)
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	301 return ret;
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	302 }
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	303
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	304 ret = resize(buffer, off + len);
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	305 if (ret)
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	306 return ret;
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	307
629 3e73334cb29c buffer: zero out any holes created during buffer write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 611 diff changeset	308 /* clear any holes */
712 8295148e8f44 buffer: rename internal 'used' member to a more obvious name Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 710 diff changeset	309 if (buffer->size < off)
8295148e8f44 buffer: rename internal 'used' member to a more obvious name Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 710 diff changeset	310 buffer->ops->clear(buffer, buffer->size, off - buffer->size);
629 3e73334cb29c buffer: zero out any holes created during buffer write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 611 diff changeset	311
611 0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	312 buffer->ops->copyin(buffer, off, buf, len);
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	313
712 8295148e8f44 buffer: rename internal 'used' member to a more obvious name Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 710 diff changeset	314 buffer->size = MAX(buffer->size, off + len);
611 0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	315
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	316 return len;
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	317 }
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	318
256 f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	319 /*
f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	320 * Generic implementations
f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	321 */
f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	322
261 6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	323 /* clear implementations */
6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	324 void generic_buffer_clear_memset(struct buffer *buffer, size_t off, size_t len)
6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	325 {
6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	326 memset(buffer->data + off, 0, len);
6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	327 }
6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	328
6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	329 void generic_buffer_clear_nop(struct buffer *buffer, size_t off, size_t len)
6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	330 {
6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	331 }
6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	332
6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	333 void generic_buffer_clear_panic(struct buffer *buffer, size_t off, size_t len)
6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	334 {
6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	335 panic("buffer clear called");
6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	336 }
6795f8427fed buffer: allow buffer truncation Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 260 diff changeset	337
256 f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	338 /* copyin implementations */
f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	339 void generic_buffer_copyin_memcpy(struct buffer *buffer, size_t off,
f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	340 const void *newdata, size_t newdatalen)
f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	341 {
f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	342 memcpy(buffer->data + off, newdata, newdatalen);
f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	343 }
f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	344
f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	345 void generic_buffer_copyin_nop(struct buffer *buffer, size_t off,
f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	346 const void *newdata, size_t newdatalen)
f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	347 {
f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	348 }
f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	349
f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	350 void generic_buffer_copyin_panic(struct buffer *buffer, size_t off,
f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	351 const void *newdata, size_t newdatalen)
f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	352 {
f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	353 panic("buffer copyin called");
f82b45b662c9 buffer: use an ops vector to customize buffer behavior Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 254 diff changeset	354 }
611 0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	355
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	356 /* copyout implementations */
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	357 void generic_buffer_copyout_memcpy(struct buffer *buffer, size_t off,
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	358 void *data, size_t datalen)
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	359 {
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	360 memcpy(data, buffer->data + off, datalen);
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	361 }
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	362
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	363 void generic_buffer_copyout_nop(struct buffer buffer, size_t off, void data,
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	364 size_t datalen)
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	365 {
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	366 }
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	367
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	368 void generic_buffer_copyout_panic(struct buffer buffer, size_t off, void data,
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	369 size_t datalen)
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	370 {
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	371 panic("buffer copyout called");
0fa2f6606c5e buffer: read and write Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 563 diff changeset	372 }
849 1c4d7ff0a682 buffer: add buffer_insert & buffer_insert_c Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 828 diff changeset	373
1c4d7ff0a682 buffer: add buffer_insert & buffer_insert_c Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 828 diff changeset	374 /* move implementations */
1c4d7ff0a682 buffer: add buffer_insert & buffer_insert_c Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 828 diff changeset	375 void generic_buffer_move_memmove(struct buffer *buffer, size_t dst,
1c4d7ff0a682 buffer: add buffer_insert & buffer_insert_c Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 828 diff changeset	376 size_t src, size_t len)
1c4d7ff0a682 buffer: add buffer_insert & buffer_insert_c Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 828 diff changeset	377 {
1c4d7ff0a682 buffer: add buffer_insert & buffer_insert_c Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 828 diff changeset	378 memmove(buffer->data + dst, buffer->data + src, len);
1c4d7ff0a682 buffer: add buffer_insert & buffer_insert_c Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 828 diff changeset	379 }
1c4d7ff0a682 buffer: add buffer_insert & buffer_insert_c Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 828 diff changeset	380
1c4d7ff0a682 buffer: add buffer_insert & buffer_insert_c Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 828 diff changeset	381 void generic_buffer_move_nop(struct buffer *buffer, size_t dst,
1c4d7ff0a682 buffer: add buffer_insert & buffer_insert_c Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 828 diff changeset	382 size_t src, size_t len)
1c4d7ff0a682 buffer: add buffer_insert & buffer_insert_c Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 828 diff changeset	383 {
1c4d7ff0a682 buffer: add buffer_insert & buffer_insert_c Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 828 diff changeset	384 }
1c4d7ff0a682 buffer: add buffer_insert & buffer_insert_c Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 828 diff changeset	385
1c4d7ff0a682 buffer: add buffer_insert & buffer_insert_c Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 828 diff changeset	386 void generic_buffer_move_panic(struct buffer *buffer, size_t dst,
1c4d7ff0a682 buffer: add buffer_insert & buffer_insert_c Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 828 diff changeset	387 size_t src, size_t len)
1c4d7ff0a682 buffer: add buffer_insert & buffer_insert_c Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 828 diff changeset	388 {
1c4d7ff0a682 buffer: add buffer_insert & buffer_insert_c Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 828 diff changeset	389 panic("buffer move called");
1c4d7ff0a682 buffer: add buffer_insert & buffer_insert_c Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 828 diff changeset	390 }
1c4d7ff0a682 buffer: add buffer_insert & buffer_insert_c Josef 'Jeff' Sipek <jeffpc@josefsipek.net> parents: 828 diff changeset	391

Mercurial > libjeffpc

annotate buffer.c @ 849:1c4d7ff0a682