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
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
|
/* SPDX-License-Identifier: MIT
*
* Copyright (c) 2026 Leah Rowe <leah@libreboot.org>
*
* String handling.
*/
#ifdef __OpenBSD__
#include <sys/param.h>
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "../include/common.h"
/*
* Portable strcmp() but blocks NULL/empty/unterminated
* strings. Even stricter than strncmp().
*/
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;
}
/*
* We reached maxlen, so assume unterminated string.
*/
err(EINVAL, "Unterminated string in xstrxcmp");
/*
* Should never reach here. This keeps compilers happy.
*/
errno = EINVAL;
return -1;
}
/*
* strnlen() but aborts on NULL input, and empty strings.
* Our version also prohibits unterminated strings.
* strnlen() was standardized in POSIX.1-2008 and is not
* available on some older systems, so we provide our own.
*/
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;
}
void
err(int nvm_errval, const char *msg, ...)
{
struct xstate *x = xstatus();
va_list args;
if (errno == 0)
errno = nvm_errval;
if (!errno)
errno = ECANCELED;
(void)exit_cleanup();
if (x != NULL)
fprintf(stderr, "%s: ", getnvmprogname());
va_start(args, msg);
vfprintf(stderr, msg, args);
va_end(args);
fprintf(stderr, ": %s\n", strerror(errno));
exit(EXIT_FAILURE);
}
const char *
getnvmprogname(void)
{
struct xstate *x = xstatus();
const char *p;
static char fallback[] = "nvmutil";
char *rval = fallback;
if (x != NULL) {
if (x->argv0 == NULL || *x->argv0 == '\0')
return "";
rval = x->argv0;
}
p = x_c_strrchr(rval, '/');
if (p)
return p + 1;
else
return rval;
}
char *
x_c_strrchr(const char *s, int c)
{
const char *p = NULL;
while (*s) {
if (*s == (char)c)
p = s;
s++;
}
if (c == '\0')
return (char *)s;
return (char *)p;
}
void *
x_v_memcpy(void *dst, const void *src, unsigned long n)
{
unsigned char *d = (unsigned char *)dst;
const unsigned char *s = (const unsigned char *)src;
while (n--)
*d++ = *s++;
return dst;
}
int
x_i_memcmp(const void *a, const void *b, unsigned long n)
{
const unsigned char *pa = (const unsigned char *)a;
const unsigned char *pb = (const unsigned char *)b;
for ( ; n--; ++pa, ++pb)
if (*pa != *pb)
return *pa - *pb;
return 0;
}
|
