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-@section Archives |
- |
- |
-@strong{Description}@* |
-An archive (or library) is just another BFD. It has a symbol |
-table, although there's not much a user program will do with it. |
- |
-The big difference between an archive BFD and an ordinary BFD |
-is that the archive doesn't have sections. Instead it has a |
-chain of BFDs that are considered its contents. These BFDs can |
-be manipulated like any other. The BFDs contained in an |
-archive opened for reading will all be opened for reading. You |
-may put either input or output BFDs into an archive opened for |
-output; they will be handled correctly when the archive is closed. |
- |
-Use @code{bfd_openr_next_archived_file} to step through |
-the contents of an archive opened for input. You don't |
-have to read the entire archive if you don't want |
-to! Read it until you find what you want. |
- |
-Archive contents of output BFDs are chained through the |
-@code{next} pointer in a BFD. The first one is findable through |
-the @code{archive_head} slot of the archive. Set it with |
-@code{bfd_set_archive_head} (q.v.). A given BFD may be in only one |
-open output archive at a time. |
- |
-As expected, the BFD archive code is more general than the |
-archive code of any given environment. BFD archives may |
-contain files of different formats (e.g., a.out and coff) and |
-even different architectures. You may even place archives |
-recursively into archives! |
- |
-This can cause unexpected confusion, since some archive |
-formats are more expressive than others. For instance, Intel |
-COFF archives can preserve long filenames; SunOS a.out archives |
-cannot. If you move a file from the first to the second |
-format and back again, the filename may be truncated. |
-Likewise, different a.out environments have different |
-conventions as to how they truncate filenames, whether they |
-preserve directory names in filenames, etc. When |
-interoperating with native tools, be sure your files are |
-homogeneous. |
- |
-Beware: most of these formats do not react well to the |
-presence of spaces in filenames. We do the best we can, but |
-can't always handle this case due to restrictions in the format of |
-archives. Many Unix utilities are braindead in regards to |
-spaces and such in filenames anyway, so this shouldn't be much |
-of a restriction. |
- |
-Archives are supported in BFD in @code{archive.c}. |
- |
-@subsection Archive functions |
- |
- |
-@findex bfd_get_next_mapent |
-@subsubsection @code{bfd_get_next_mapent} |
-@strong{Synopsis} |
-@example |
-symindex bfd_get_next_mapent |
- (bfd *abfd, symindex previous, carsym **sym); |
-@end example |
-@strong{Description}@* |
-Step through archive @var{abfd}'s symbol table (if it |
-has one). Successively update @var{sym} with the next symbol's |
-information, returning that symbol's (internal) index into the |
-symbol table. |
- |
-Supply @code{BFD_NO_MORE_SYMBOLS} as the @var{previous} entry to get |
-the first one; returns @code{BFD_NO_MORE_SYMBOLS} when you've already |
-got the last one. |
- |
-A @code{carsym} is a canonical archive symbol. The only |
-user-visible element is its name, a null-terminated string. |
- |
-@findex bfd_set_archive_head |
-@subsubsection @code{bfd_set_archive_head} |
-@strong{Synopsis} |
-@example |
-bfd_boolean bfd_set_archive_head (bfd *output, bfd *new_head); |
-@end example |
-@strong{Description}@* |
-Set the head of the chain of |
-BFDs contained in the archive @var{output} to @var{new_head}. |
- |
-@findex bfd_openr_next_archived_file |
-@subsubsection @code{bfd_openr_next_archived_file} |
-@strong{Synopsis} |
-@example |
-bfd *bfd_openr_next_archived_file (bfd *archive, bfd *previous); |
-@end example |
-@strong{Description}@* |
-Provided a BFD, @var{archive}, containing an archive and NULL, open |
-an input BFD on the first contained element and returns that. |
-Subsequent calls should pass |
-the archive and the previous return value to return a created |
-BFD to the next contained element. NULL is returned when there |
-are no more. |
- |