1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
/* This software was written by Dirk Engling <erdgeist@erdgeist.org>
It is considered beerware. Prost. Skol. Cheers or whatever.
$id$ */
/* System */
#include <stdlib.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <unistd.h>
/* Libowfat */
/* Opentracker */
#include "ot_iovec.h"
void *iovec_increase(int *iovec_entries, struct iovec **iovector, size_t new_alloc) {
void *new_data;
int new_entries = 1 + *iovec_entries;
struct iovec *new_vec = realloc(*iovector, new_entries * sizeof(struct iovec));
if (!new_vec)
return NULL;
/* Only allocate after we have a place to store the pointer */
new_data = malloc(new_alloc);
if (!new_data)
return NULL;
new_vec[new_entries - 1].iov_base = new_data;
new_vec[new_entries - 1].iov_len = new_alloc;
*iovector = new_vec;
++*iovec_entries;
return new_data;
}
void *iovec_append(int *iovec_entries, struct iovec **iovector, struct iovec *append_iovector) {
int new_entries = *iovec_entries + 1;
struct iovec *new_vec = realloc(*iovector, new_entries * sizeof(struct iovec));
if (!new_vec)
return NULL;
/* Take over data from appended iovec */
new_vec[*iovec_entries].iov_base = append_iovector->iov_base;
new_vec[*iovec_entries].iov_len = append_iovector->iov_len;
append_iovector->iov_base = NULL;
append_iovector->iov_len = 0;
*iovector = new_vec;
*iovec_entries = new_entries;
return new_vec;
}
void iovec_free(int *iovec_entries, struct iovec **iovector) {
int i;
for (i = 0; i < *iovec_entries; ++i)
free(((*iovector)[i]).iov_base);
*iovector = NULL;
*iovec_entries = 0;
}
void iovec_fixlast(int *iovec_entries, struct iovec **iovector, void *last_ptr) {
if (*iovec_entries) {
char *base = (char *)((*iovector)[*iovec_entries - 1]).iov_base;
size_t new_alloc = ((char *)last_ptr) - base;
((*iovector)[*iovec_entries - 1]).iov_base = realloc(base, new_alloc);
((*iovector)[*iovec_entries - 1]).iov_len = new_alloc;
}
}
void *iovec_fix_increase_or_free(int *iovec_entries, struct iovec **iovector, void *last_ptr, size_t new_alloc) {
void *new_data;
iovec_fixlast(iovec_entries, iovector, last_ptr);
if (!(new_data = iovec_increase(iovec_entries, iovector, new_alloc)))
iovec_free(iovec_entries, iovector);
return new_data;
}
size_t iovec_length(const int *iovec_entries, const struct iovec **iovector) {
size_t length = 0;
int i;
for (i = 0; i < *iovec_entries; ++i)
length += ((*iovector)[i]).iov_len;
return length;
}
|
