]>
git.ipfire.org Git - thirdparty/git.git/blob - vcs-svn/line_buffer.c
39d52b88b754338f7ad86cb71c1b7998f110f272
2 * Licensed under a two-clause BSD-style license.
3 * See LICENSE for details.
6 #include "git-compat-util.h"
7 #include "line_buffer.h"
10 #define COPY_BUFFER_LEN 4096
12 int buffer_init(struct line_buffer
*buf
, const char *filename
)
14 buf
->infile
= filename
? fopen(filename
, "r") : stdin
;
20 int buffer_fdinit(struct line_buffer
*buf
, int fd
)
22 buf
->infile
= fdopen(fd
, "r");
28 int buffer_tmpfile_init(struct line_buffer
*buf
)
30 buf
->infile
= tmpfile();
36 int buffer_deinit(struct line_buffer
*buf
)
39 if (buf
->infile
== stdin
)
40 return ferror(buf
->infile
);
41 err
= ferror(buf
->infile
);
42 err
|= fclose(buf
->infile
);
46 FILE *buffer_tmpfile_rewind(struct line_buffer
*buf
)
52 long buffer_tmpfile_prepare_to_read(struct line_buffer
*buf
)
54 long pos
= ftell(buf
->infile
);
56 return error("ftell error: %s", strerror(errno
));
57 if (fseek(buf
->infile
, 0, SEEK_SET
))
58 return error("seek error: %s", strerror(errno
));
62 int buffer_ferror(struct line_buffer
*buf
)
64 return ferror(buf
->infile
);
67 int buffer_read_char(struct line_buffer
*buf
)
69 return fgetc(buf
->infile
);
72 /* Read a line without trailing newline. */
73 char *buffer_read_line(struct line_buffer
*buf
)
76 if (!fgets(buf
->line_buffer
, sizeof(buf
->line_buffer
), buf
->infile
))
77 /* Error or data exhausted. */
79 end
= buf
->line_buffer
+ strlen(buf
->line_buffer
);
82 else if (feof(buf
->infile
))
83 ; /* No newline at end of file. That's fine. */
87 * There is probably a saner way to deal with this,
88 * but for now let's return an error.
91 return buf
->line_buffer
;
94 char *buffer_read_string(struct line_buffer
*buf
, uint32_t len
)
96 strbuf_reset(&buf
->blob_buffer
);
97 strbuf_fread(&buf
->blob_buffer
, len
, buf
->infile
);
98 return ferror(buf
->infile
) ? NULL
: buf
->blob_buffer
.buf
;
101 void buffer_read_binary(struct line_buffer
*buf
,
102 struct strbuf
*sb
, uint32_t size
)
104 strbuf_fread(sb
, size
, buf
->infile
);
107 void buffer_copy_bytes(struct line_buffer
*buf
, off_t len
)
109 char byte_buffer
[COPY_BUFFER_LEN
];
111 while (len
> 0 && !feof(buf
->infile
) && !ferror(buf
->infile
)) {
112 in
= len
< COPY_BUFFER_LEN
? len
: COPY_BUFFER_LEN
;
113 in
= fread(byte_buffer
, 1, in
, buf
->infile
);
115 fwrite(byte_buffer
, 1, in
, stdout
);
116 if (ferror(stdout
)) {
117 buffer_skip_bytes(buf
, len
);
123 off_t
buffer_skip_bytes(struct line_buffer
*buf
, off_t nbytes
)
125 char byte_buffer
[COPY_BUFFER_LEN
];
127 while (done
< nbytes
&& !feof(buf
->infile
) && !ferror(buf
->infile
)) {
128 off_t len
= nbytes
- done
;
129 size_t in
= len
< COPY_BUFFER_LEN
? len
: COPY_BUFFER_LEN
;
130 done
+= fread(byte_buffer
, 1, in
, buf
->infile
);
135 void buffer_reset(struct line_buffer
*buf
)
137 strbuf_release(&buf
->blob_buffer
);