1984-07-12 15:18:13 +00:00
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.\" $Header$
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1984-07-12 14:14:54 +00:00
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.TH ARCH 5
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.SH NAME
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arch \- archive (library) file format
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.SH SYNOPSIS
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.B #include "/usr/em/h/arch.h"
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.SH DESCRIPTION
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The archive command
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.I arch
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is used to combine several files into
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one.
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Archives are used mainly as libraries to be searched
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by the EM assembler/linker em_ass(VI) or the universal
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assembler/linker em_unias(VI).
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.PP
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A file produced by
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.I arch
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has a magic number at the start,
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followed by the constituent files, each preceded by a file header.
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The magic number and header layout as described in the
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include file are:
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.RS
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.PP
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.nf
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.ta \w'#define 'u +\w'ARMAG 'u
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.so ../h/arch.h
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.fi
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.RE
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.LP
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The name is a null-terminated string;
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The sizes of the other entries are determined as follows:
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long's are 4 bytes in PDP-11 order, int are 2 bytes, low order
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byte first, char's are 1 byte.
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The date is in the
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form of
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.IR time (2);
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the user ID and group ID are numbers; the mode is a bit pattern
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per
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.IR chmod (2);
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the size is counted in bytes.
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.PP
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Each file begins on a even offset;
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a null byte is inserted between files if necessary.
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Nevertheless the size given reflects the
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actual size of the file exclusive of padding.
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.PP
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Notice there is no provision for empty areas in an archive
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file.
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.SH "SEE ALSO"
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arch(I), em_ass(VI), em_unias(VI)
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.SH BUGS
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Coding user and group IDs as characters is a botch.
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