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/*
* 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
int buffer_init(struct line_buffer *buf, const char *filename)
{
buf->infile = filename ? fopen(filename, "r") : stdin;
if (!buf->infile)
return -1;
return 0;
}
int buffer_fdinit(struct line_buffer *buf, int fd)
{
buf->infile = fdopen(fd, "r");
if (!buf->infile)
return -1;
return 0;
}
int buffer_tmpfile_init(struct line_buffer *buf)
{
buf->infile = tmpfile();
if (!buf->infile)
return -1;
return 0;
}
int buffer_deinit(struct line_buffer *buf)
{
int err;
if (buf->infile == stdin)
return ferror(buf->infile);
err = ferror(buf->infile);
err |= fclose(buf->infile);
return err;
}
FILE *buffer_tmpfile_rewind(struct line_buffer *buf)
{
rewind(buf->infile);
return buf->infile;
}
long buffer_tmpfile_prepare_to_read(struct line_buffer *buf)
{
long pos = ftell(buf->infile);
if (pos < 0)
return error_errno("ftell error");
if (fseek(buf->infile, 0, SEEK_SET))
return error_errno("seek error");
return pos;
}
int buffer_ferror(struct line_buffer *buf)
{
return ferror(buf->infile);
}
int buffer_read_char(struct line_buffer *buf)
{
return fgetc(buf->infile);
}
/* Read a line without trailing newline. */
char *buffer_read_line(struct line_buffer *buf)
{
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;
}
size_t buffer_read_binary(struct line_buffer *buf,
struct strbuf *sb, size_t size)
{
return strbuf_fread(sb, size, buf->infile);
}
off_t buffer_copy_bytes(struct line_buffer *buf, off_t nbytes)
{
char byte_buffer[COPY_BUFFER_LEN];
off_t done = 0;
while (done < nbytes && !feof(buf->infile) && !ferror(buf->infile)) {
off_t len = nbytes - done;
size_t in = len < COPY_BUFFER_LEN ? len : COPY_BUFFER_LEN;
in = fread(byte_buffer, 1, in, buf->infile);
done += in;
fwrite(byte_buffer, 1, in, stdout);
if (ferror(stdout))
return done + buffer_skip_bytes(buf, nbytes - done);
}
return done;
}
off_t buffer_skip_bytes(struct line_buffer *buf, off_t nbytes)
{
char byte_buffer[COPY_BUFFER_LEN];
off_t done = 0;
while (done < nbytes && !feof(buf->infile) && !ferror(buf->infile)) {
off_t len = nbytes - done;
size_t in = len < COPY_BUFFER_LEN ? len : COPY_BUFFER_LEN;
done += fread(byte_buffer, 1, in, buf->infile);
}
return done;
}
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