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_errno("ftell error");
57 if (fseek(buf->infile, 0, SEEK_SET))
58 return error_errno("seek error");
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 size_t buffer_read_binary(struct line_buffer *buf,
95 struct strbuf *sb, size_t size)
97 return strbuf_fread(sb, size, buf->infile);
100 off_t buffer_copy_bytes(struct line_buffer *buf, off_t nbytes)
102 char byte_buffer[COPY_BUFFER_LEN];
104 while (done < nbytes && !feof(buf->infile) && !ferror(buf->infile)) {
105 off_t len = nbytes - done;
106 size_t in = len < COPY_BUFFER_LEN ? len : COPY_BUFFER_LEN;
107 in = fread(byte_buffer, 1, in, buf->infile);
109 fwrite(byte_buffer, 1, in, stdout);
111 return done + buffer_skip_bytes(buf, nbytes - done);
116 off_t buffer_skip_bytes(struct line_buffer *buf, off_t nbytes)
118 char byte_buffer[COPY_BUFFER_LEN];
120 while (done < nbytes && !feof(buf->infile) && !ferror(buf->infile)) {
121 off_t len = nbytes - done;
122 size_t in = len < COPY_BUFFER_LEN ? len : COPY_BUFFER_LEN;
123 done += fread(byte_buffer, 1, in, buf->infile);