mirror of https://github.com/GnoConsortium/gno.git
82 lines
1.9 KiB
Groff
82 lines
1.9 KiB
Groff
.\"
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.\" $Id: parsearg.3,v 1.1 1997/02/27 07:32:24 gdr Exp $
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.\"
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.TH GNO_COMMAND 3 "27 January 1997" GNO "Library Routines"
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.SH NAME
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.BR ~GNO_COMMAND ,
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.BR ~GNO_PARSEARG ,
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.BR ~GNO_FREEARG
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\- command line parsing and startup from assembly code
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.SH SYNOPSIS
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.BR ~GNO_COMMAND
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.br
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.BR ~GNO_PARSEARG
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subroutine (4:\fIcommandline\fR,4:\fIargptr\fR)
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.br
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.BR ~GNO_FREEARG
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subroutine (4:\fIargv\fR,2:\fIargc\fR)
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.SH DESCRIPTION
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.BR ~GNO_COMMAND
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emulates the startup code of a C program, and acts as a wrapper for the
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.BR ~GNO_PARSEARG
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and
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.BR ~GNO_FREEARG
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functions, below. To use this routine, immediately execute a JML to
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.BR ~GNO_COMMAND
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from your first segment. Ensure you have a function
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.BR main ()
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that conforms to the following C prototype:
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.nf
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int \fBmain\fR (int \fIargc\fR, char **\fIargv\fR);
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.fi
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.LP
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.BR ~GNO_PARSEARG
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will take the command line passed to a utility and parse it into an
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.IR argc ,
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.IR argv
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structure like those used in C programs. This was written
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.IR not
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as a replacement for a C parser, but for use by assembly language
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programmers writing shell commands.
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.LP
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.IR commandline
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is the raw command line string as passed by the calling shell in the
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X and Y registers.
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.IR argptr
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is a pointer to an
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.IR argv []-style
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array.
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.LP
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.BR ~GNO_FREEARG
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frees the region allocated by
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.BR ~GNO_PARSEARG .
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.IR argv
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and
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.IR argc
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should be the region pointed to by
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.IR argptr
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and the return value of
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.BR ~GNO_PARSEARG ,
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respectively.
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.SH RETURN VALUE
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.BR ~GNO_COMMAND
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returns in the accumulator the value returned by
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.BR main ().
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.LP
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.BR ~GNO_PARSEARG
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returns in the accumulator the number of arguments found.
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.LP
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.BR ~GNO_FREEARG
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does not return a value.
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.SH HISTORY
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These routines first appeared in GNO v1.0. They are based on actual
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.BR gsh (1)
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parsing code.
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.SH CAVEATS
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.BR ~GNO_PARSEARG
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.IR assumes
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that the ByteWorks Memory Manager has been started up and is usable.
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No such assumption is made with
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.BR ~GNO_COMMAND .
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