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Diffstat (limited to 'vcs-svn/line_buffer.txt')
| -rw-r--r-- | vcs-svn/line_buffer.txt | 77 |
1 files changed, 0 insertions, 77 deletions
diff --git a/vcs-svn/line_buffer.txt b/vcs-svn/line_buffer.txt deleted file mode 100644 index 8e139eb..0000000 --- a/vcs-svn/line_buffer.txt +++ /dev/null @@ -1,77 +0,0 @@ -line_buffer API -=============== - -The line_buffer library provides a convenient interface for -mostly-line-oriented input. - -Each line is not permitted to exceed 10000 bytes. The provided -functions are not thread-safe or async-signal-safe, and like -`fgets()`, they generally do not function correctly if interrupted -by a signal without SA_RESTART set. - -Calling sequence ----------------- - -The calling program: - - - initializes a `struct line_buffer` to LINE_BUFFER_INIT - - specifies a file to read with `buffer_init` - - processes input with `buffer_read_line`, `buffer_skip_bytes`, - and `buffer_copy_bytes` - - closes the file with `buffer_deinit`, perhaps to start over and - read another file. - -When finished, the caller can use `buffer_reset` to deallocate -resources. - -Using temporary files ---------------------- - -Temporary files provide a place to store data that should not outlive -the calling program. A program - - - initializes a `struct line_buffer` to LINE_BUFFER_INIT - - requests a temporary file with `buffer_tmpfile_init` - - acquires an output handle by calling `buffer_tmpfile_rewind` - - uses standard I/O functions like `fprintf` and `fwrite` to fill - the temporary file - - declares writing is over with `buffer_tmpfile_prepare_to_read` - - can re-read what was written with `buffer_read_line`, - `buffer_copy_bytes`, and so on - - can reuse the temporary file by calling `buffer_tmpfile_rewind` - again - - removes the temporary file with `buffer_deinit`, perhaps to - reuse the line_buffer for some other file. - -When finished, the calling program can use `buffer_reset` to deallocate -resources. - -Functions ---------- - -`buffer_init`, `buffer_fdinit`:: - Open the named file or file descriptor for input. - buffer_init(buf, NULL) prepares to read from stdin. - On failure, returns -1 (with errno indicating the nature - of the failure). - -`buffer_deinit`:: - Stop reading from the current file (closing it unless - it was stdin). Returns nonzero if `fclose` fails or - the error indicator was set. - -`buffer_read_line`:: - Read a line and strip off the trailing newline. - On failure or end of file, returns NULL. - -`buffer_copy_bytes`:: - Read `len` bytes of input and dump them to the standard output - stream. Returns early for error or end of file. - -`buffer_skip_bytes`:: - Discards `len` bytes from the input stream (stopping early - if necessary because of an error or eof). Return value is - the number of bytes successfully read. - -`buffer_reset`:: - Deallocates non-static buffers. |