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
|
/*
* Licensed under a two-clause BSD-style license.
* See LICENSE for details.
*/
#include "git-compat-util.h"
#include "line_buffer.h"
#include "strbuf.h"
#define COPY_BUFFER_LEN 4096
static struct line_buffer buf_ = LINE_BUFFER_INIT;
static struct line_buffer *buf;
int buffer_init(const char *filename)
{
buf = &buf_;
buf->infile = filename ? fopen(filename, "r") : stdin;
if (!buf->infile)
return -1;
return 0;
}
int buffer_deinit(void)
{
int err;
if (buf->infile == stdin)
return ferror(buf->infile);
err = ferror(buf->infile);
err |= fclose(buf->infile);
return err;
}
/* Read a line without trailing newline. */
char *buffer_read_line(void)
{
char *end;
if (!fgets(buf->line_buffer, sizeof(buf->line_buffer), buf->infile))
/* Error or data exhausted. */
return NULL;
end = buf->line_buffer + strlen(buf->line_buffer);
if (end[-1] == '\n')
end[-1] = '\0';
else if (feof(buf->infile))
; /* No newline at end of file. That's fine. */
else
/*
* Line was too long.
* There is probably a saner way to deal with this,
* but for now let's return an error.
*/
return NULL;
return buf->line_buffer;
}
char *buffer_read_string(uint32_t len)
{
strbuf_reset(&buf->blob_buffer);
strbuf_fread(&buf->blob_buffer, len, buf->infile);
return ferror(buf->infile) ? NULL : buf->blob_buffer.buf;
}
void buffer_copy_bytes(uint32_t len)
{
char byte_buffer[COPY_BUFFER_LEN];
uint32_t in;
while (len > 0 && !feof(buf->infile) && !ferror(buf->infile)) {
in = len < COPY_BUFFER_LEN ? len : COPY_BUFFER_LEN;
in = fread(byte_buffer, 1, in, buf->infile);
len -= in;
fwrite(byte_buffer, 1, in, stdout);
if (ferror(stdout)) {
buffer_skip_bytes(len);
return;
}
}
}
void buffer_skip_bytes(uint32_t len)
{
char byte_buffer[COPY_BUFFER_LEN];
uint32_t in;
while (len > 0 && !feof(buf->infile) && !ferror(buf->infile)) {
in = len < COPY_BUFFER_LEN ? len : COPY_BUFFER_LEN;
in = fread(byte_buffer, 1, in, buf->infile);
len -= in;
}
}
void buffer_reset(void)
{
strbuf_release(&buf->blob_buffer);
}
|
