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b1c9b798a6
It can sometimes be useful to write information temporarily to file,
to read back later. These functions allow a program to use the
line_buffer facilities when doing so.
It works like this:
1. find a unique filename with buffer_tmpfile_init.
2. rewind with buffer_tmpfile_rewind. This returns a stdio
handle for writing.
3. when finished writing, declare so with
buffer_tmpfile_prepare_to_read. The return value indicates
how many bytes were written.
4. read whatever portion of the file is needed.
5. if finished, remove the temporary file with buffer_deinit.
otherwise, go back to step 2,
The svn support would use this to buffer the postimage from delta
application until the length is known and fast-import can receive
the resulting blob.
Based-on-patch-by: David Barr <david.barr@cordelta.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
31 lines
1 KiB
C
31 lines
1 KiB
C
#ifndef LINE_BUFFER_H_
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#define LINE_BUFFER_H_
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#include "strbuf.h"
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#define LINE_BUFFER_LEN 10000
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struct line_buffer {
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char line_buffer[LINE_BUFFER_LEN];
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struct strbuf blob_buffer;
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FILE *infile;
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};
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#define LINE_BUFFER_INIT {"", STRBUF_INIT, NULL}
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int buffer_init(struct line_buffer *buf, const char *filename);
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int buffer_fdinit(struct line_buffer *buf, int fd);
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int buffer_deinit(struct line_buffer *buf);
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void buffer_reset(struct line_buffer *buf);
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int buffer_tmpfile_init(struct line_buffer *buf);
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FILE *buffer_tmpfile_rewind(struct line_buffer *buf); /* prepare to write. */
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long buffer_tmpfile_prepare_to_read(struct line_buffer *buf);
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char *buffer_read_line(struct line_buffer *buf);
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char *buffer_read_string(struct line_buffer *buf, uint32_t len);
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int buffer_read_char(struct line_buffer *buf);
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void buffer_read_binary(struct line_buffer *buf, struct strbuf *sb, uint32_t len);
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void buffer_copy_bytes(struct line_buffer *buf, uint32_t len);
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void buffer_skip_bytes(struct line_buffer *buf, uint32_t len);
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#endif
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