blob: b1a5c3e2c8975a5d36c61a0b7975846cba28a7d1 (
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
|
/* SPDX-License-Identifier: MIT
* Copyright (c) 2026 Leah Rowe <leah@libreboot.org>
*
* String functions
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <stddef.h>
#include <unistd.h>
#include "../include/common.h"
/* Portable strncmp() that blocks
* NULL/empty/unterminated strings
*/
int
xstrxcmp(const char *a, const char *b, unsigned long maxlen)
{
unsigned long i;
if (a == NULL || b == NULL)
err(EINVAL, "NULL input to xstrxcmp");
if (*a == '\0' || *b == '\0')
err(EINVAL, "Empty string in xstrxcmp");
for (i = 0; i < maxlen; i++) {
unsigned char ac = (unsigned char)a[i];
unsigned char bc = (unsigned char)b[i];
if (ac == '\0' || bc == '\0') {
if (ac == bc)
return 0;
return ac - bc;
}
if (ac != bc)
return ac - bc;
}
err(EINVAL, "Unterminated string in xstrxcmp");
errno = EINVAL;
return -1;
}
/* Portable strncmp() that blocks
* NULL/empty/unterminated strings
*/
unsigned long
xstrxlen(const char *scmp, unsigned long maxlen)
{
unsigned long xstr_index;
if (scmp == NULL)
err(EINVAL, "NULL input to xstrxlen");
if (*scmp == '\0')
err(EINVAL, "Empty string in xstrxlen");
for (xstr_index = 0;
xstr_index < maxlen && scmp[xstr_index] != '\0';
xstr_index++);
if (xstr_index == maxlen)
err(EINVAL, "Unterminated string in xstrxlen");
return xstr_index;
}
|
