blob: 0df6c17beb851e1645db389b95e00fe6361b0d7a (
plain)
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
|
/******************************************************/
/* tpax: a topological pax implementation */
/* Copyright (C) 2020 Z. Gilboa */
/* Released under GPLv2 and GPLv3; see COPYING.TPAX. */
/******************************************************/
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/stat.h>
#include <tpax/tpax.h>
#include "tpax_driver_impl.h"
int tpax_path_copy(
char * dstpath,
const char * srcpath,
size_t bufsize,
uint32_t flags,
size_t * nwritten)
{
const char * src;
char * dst;
char * cap;
if (!bufsize) {
errno = ENOBUFS;
return -1;
}
src = srcpath;
dst = dstpath;
cap = &dst[bufsize];
if ((src[0] == '/') && (src[1] == '/') && (src[2] != '/')) {
*dst++ = *src++;
*dst++ = *src++;
}
if (flags & TPAX_DRIVER_PURE_PATH_OUTPUT)
if ((src[0] == '.') && (src[1] == '/'))
for (++src; *src=='/'; src++)
(void)0;
for (; *src; ) {
if ((src[0] == '.') && (src[1] == '.')) {
if ((src[2] == '/') || (src[2] == '\0')) {
if (flags & TPAX_DRIVER_STRICT_PATH_INPUT) {
errno = EINVAL;
return -1;
}
}
}
if (flags & TPAX_DRIVER_PURE_PATH_OUTPUT) {
if ((src[0] == '.') && (src[1] == '/') && (src[-1] == '/')) {
for (++src; *src=='/'; src++)
(void)0;
} else if ((src[0] == '/')) {
for (src++; *src=='/'; src++)
(void)0;
*dst++ = '/';
} else {
*dst++ = *src++;
}
} else {
*dst++ = *src++;
}
if (dst == cap) {
errno = ENOBUFS;
return -1;
}
}
if (nwritten)
*nwritten = dst - dstpath;
*dst = '\0';
return 0;
}
|