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
|
/***
This file is part of eudev, forked from systemd.
Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <unistd.h>
#include <sys/sendfile.h>
#include "fileio.h"
#include "util.h"
#include "strv.h"
#include "utf8.h"
#include "ctype.h"
int write_string_stream(FILE *f, const char *line) {
assert(f);
assert(line);
errno = 0;
fputs(line, f);
if (!endswith(line, "\n"))
fputc('\n', f);
fflush(f);
if (ferror(f))
return errno ? -errno : -EIO;
return 0;
}
int write_string_file(const char *fn, const char *line) {
_cleanup_fclose_ FILE *f = NULL;
assert(fn);
assert(line);
f = fopen(fn, "we");
if (!f)
return -errno;
return write_string_stream(f, line);
}
int read_one_line_file(const char *fn, char **line) {
_cleanup_fclose_ FILE *f = NULL;
char t[LINE_MAX], *c;
assert(fn);
assert(line);
f = fopen(fn, "re");
if (!f)
return -errno;
if (!fgets(t, sizeof(t), f)) {
if (ferror(f))
return errno ? -errno : -EIO;
t[0] = 0;
}
c = strdup(t);
if (!c)
return -ENOMEM;
truncate_nl(c);
*line = c;
return 0;
}
int read_full_file(const char *fn, char **contents, size_t *size) {
_cleanup_fclose_ FILE *f = NULL;
size_t n, l;
_cleanup_free_ char *buf = NULL;
struct stat st;
assert(fn);
assert(contents);
f = fopen(fn, "re");
if (!f)
return -errno;
if (fstat(fileno(f), &st) < 0)
return -errno;
/* Safety check */
if (st.st_size > 4*1024*1024)
return -E2BIG;
n = st.st_size > 0 ? st.st_size : LINE_MAX;
l = 0;
for (;;) {
char *t;
size_t k;
t = realloc(buf, n+1);
if (!t)
return -ENOMEM;
buf = t;
k = fread(buf + l, 1, n - l, f);
if (k <= 0) {
if (ferror(f))
return -errno;
break;
}
l += k;
n *= 2;
/* Safety check */
if (n > 4*1024*1024)
return -E2BIG;
}
buf[l] = 0;
*contents = buf;
buf = NULL; /* do not free */
if (size)
*size = l;
return 0;
}
|
