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Manual Reference Pages  -  ARCHIVE_FORMAT (3)


archive_clear_error, archive_compression, archive_compression_name, archive_copy_error, archive_errno, archive_error_string, archive_file_count, archive_filter_code, archive_filter_count, archive_filter_name, archive_format, archive_format_name, archive_position, archive_set_error - libarchive utility functions


See Also


Streaming Archive Library (libarchive, -larchive)


.In archive.h void archive_clear_error struct archive * int archive_compression struct archive * const char * archive_compression_name struct archive * void archive_copy_error struct archive * struct archive * int archive_errno struct archive * const char * archive_error_string struct archive * int archive_file_count struct archive * int archive_filter_code struct archive * int int archive_filter_count struct archive * int const char * archive_filter_name struct archive * int int archive_format struct archive * const char * archive_format_name struct archive * int64_t archive_position struct archive * int void
.Fo archive_set_error struct archive * int error_code const char *fmt ...


These functions provide access to various information about the struct archive object used in the libarchive(3) library.
archive_clear_error Clears any error information left over from a previous call. Not generally used in client code.
archive_compression Synonym for archive_filter_code(a, 0).
archive_compression_name Synonym for archive_filter_name(a, 0).
archive_copy_error Copies error information from one archive to another.
archive_errno Returns a numeric error code (see errno(2)) indicating the reason for the most recent error return. Note that this can not be reliably used to detect whether an error has occurred. It should be used only after another libarchive function has returned an error status.
archive_error_string Returns a textual error message suitable for display. The error message here is usually more specific than that obtained from passing the result of archive_errno to strerror(3).
archive_file_count Returns a count of the number of files processed by this archive object. The count is incremented by calls to archive_write_header(3) or archive_read_next_header(3).
archive_filter_code Returns a numeric code identifying the indicated filter. See archive_filter_count for details of the numbering.
archive_filter_count Returns the number of filters in the current pipeline. For read archive handles, these filters are added automatically by the automatic format detection. For write archive handles, these filters are added by calls to the various archive_write_add_filter_XXX functions. Filters in the resulting pipeline are numbered so that filter 0 is the filter closest to the format handler. As a convenience, functions that expect a filter number will accept -1 as a synonym for the highest-numbered filter.

For example, when reading a uuencoded gzipped tar archive, there are three filters: filter 0 is the gunzip filter, filter 1 is the uudecode filter, and filter 2 is the pseudo-filter that wraps the archive read functions. In this case, requesting archive_position(a, -1) would be a synonym for archive_position(a, 2) which would return the number of bytes currently read from the archive, while archive_position(a, 1) would return the number of bytes after uudecoding, and archive_position(a, 0) would return the number of bytes after decompression.

archive_filter_name Returns a textual name identifying the indicated filter. See archive_filter_count for details of the numbering.
archive_format Returns a numeric code indicating the format of the current archive entry. This value is set by a successful call to archive_read_next_header. Note that it is common for this value to change from entry to entry. For example, a tar archive might have several entries that utilize GNU tar extensions and several entries that do not. These entries will have different format codes.
archive_format_name A textual description of the format of the current entry.
archive_position Returns the number of bytes read from or written to the indicated filter. In particular, archive_position(a, 0) returns the number of bytes read or written by the format handler, while archive_position(a, -1) returns the number of bytes read or written to the archive. See archive_filter_count for details of the numbering here.
archive_set_error Sets the numeric error code and error description that will be returned by archive_errno and archive_error_string. This function should be used within I/O callbacks to set system-specific error codes and error descriptions. This function accepts a printf-like format string and arguments. However, you should be careful to use only the following printf format specifiers: "%c", "%d", "%jd", "%jo", "%ju", "%jx", "%ld", "%lo", "%lu", "%lx", "%o", "%u", "%s", "%x", "%%". Field-width specifiers and other printf features are not uniformly supported and should not be used.


archive_read(3), archive_write(3), libarchive(3), printf(3)


The libarchive library first appeared in
.Fx 5.3 .


.An -nosplit The libarchive library was written by
.An Tim Kientzle Aq .
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