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
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
|
// SPDX-License-Identifier: GPL-2.0
/*
* utils: set of common functions
*
* Copyright (C) 2020 Patrick Uiterwijk <patrick@puiterwijk.org>
* Copyright (C) 2010 Cyril Hrubis <chrubis@suse.cz>
*/
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include "utils.h"
#ifndef MIN
# define MIN(a, b) ({ \
typeof(a) _a = (a); \
typeof(b) _b = (b); \
_a < _b ? _a : _b; \
})
#endif /* MIN */
static int file_exist(const char *path)
{
struct stat st;
if (!access(path, R_OK) && !stat(path, &st) && S_ISREG(st.st_mode))
return 1;
return 0;
}
int get_cmd_path(const char *prog_name, char *buf, size_t buf_len)
{
const char *path = (const char *)getenv("PATH");
const char *start = path;
const char *end;
size_t size, ret;
if (path == NULL)
return -1;
do {
end = strchr(start, ':');
if (end != NULL)
snprintf(buf, MIN(buf_len, (size_t) (end - start + 1)),
"%s", start);
else
snprintf(buf, buf_len, "%s", start);
size = strlen(buf);
/*
* "::" inside $PATH, $PATH ending with ':' or $PATH starting
* with ':' should be expanded into current working directory.
*/
if (size == 0) {
snprintf(buf, buf_len, ".");
size = strlen(buf);
}
/*
* If there is no '/' ad the end of path from $PATH add it.
*/
if (buf[size - 1] != '/')
ret =
snprintf(buf + size, buf_len - size, "/%s",
prog_name);
else
ret =
snprintf(buf + size, buf_len - size, "%s",
prog_name);
if (buf_len - size > ret && file_exist(buf))
return 0;
if (end != NULL)
start = end + 1;
} while (end != NULL);
return -1;
}
int hex_to_bin(char ch)
{
if ((ch >= '0') && (ch <= '9'))
return ch - '0';
ch = tolower(ch);
if ((ch >= 'a') && (ch <= 'f'))
return ch - 'a' + 10;
return -1;
}
int hex2bin(void *dst, const char *src, size_t count)
{
int hi, lo;
while (count--) {
if (*src == ' ')
src++;
hi = hex_to_bin(*src++);
lo = hex_to_bin(*src++);
if ((hi < 0) || (lo < 0))
return -1;
*(uint8_t *)dst++ = (hi << 4) | lo;
}
return 0;
}
|