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-.TH 9PCMDBUF 3
-.SH NAME
-Cmdbuf, parsecmd, respondcmderror, lookupcmd \- control message parsing
-.SH SYNOPSIS
-.ft L
-.nf
-#include <u.h>
-#include <libc.h>
-#include <fcall.h>
-#include <thread.h>
-#include <9p.h>
-.fi
-.PP
-.ft L
-.nf
-.ta \w'\fL1234'u +\w'\fL12345678'u
-typedef struct Cmdbuf
-{
-	char	*buf;
-	char	**f;
-	int	nf;
-} Cmdbuf;
-
-typedef struct Cmdtab
-{
-	int	index;
-	char	*cmd;
-	int	narg;
-};
-
-Cmdbuf	*parsecmd(char *p, int n)
-Cmdtab	*lookupcmd(Cmdbuf *cb, Cmdtab *tab, int ntab)
-void	respondcmderror(Req *r, Cmdbuf *cb, char *fmt, ...)
-.fi
-.SH DESCRIPTION
-These data structures and functions provide parsing of textual control messages.
-.PP
-.I Parsecmd
-treats the
-.I n
-bytes at
-.I p
-(which need not be NUL-terminated) as a UTF string and splits it
-using
-.I tokenize
-(see
-.IR getfields (3)).
-It returns a
-.B Cmdbuf
-structure holding pointers to each field in the message.
-.PP
-.I Lookupcmd
-walks through the array
-.IR ctab ,
-which has
-.I ntab
-entries,
-looking for the first
-.B Cmdtab
-that matches the parsed command.
-(If the parsed command is empty,
-.I lookupcmd
-returns nil immediately.)
-A
-.B Cmdtab
-matches the command if
-.I cmd
-is equal to
-.IB cb -> f [0]
-or if
-.I cmd
-is 
-.LR * .
-Once a matching
-.B Cmdtab
-has been found, if
-.I narg
-is not zero, then the parsed command
-must have exactly
-.I narg
-fields (including the command string itself).
-If the command has the wrong number of arguments,
-.I lookupcmd
-returns nil.
-Otherwise, it returns a pointer to the
-.B Cmdtab
-entry.
-If
-.I lookupcmd
-does not find a matching command at all,
-it returns nil.
-Whenever
-.I lookupcmd
-returns nil, it sets the system error string.
-.PP
-.I Respondcmderror
-resoponds to request
-.I r
-with an error of the form
-`\fIfmt\fB:\fI cmd\fR,'
-where
-.I fmt
-is the formatted string and
-.I cmd
-is a reconstruction of the parsed command.
-Fmt
-is often simply
-.B "%r" .
-.SH EXAMPLES
-This interface is not used in any distributed 9P servers.
-It was lifted from the Plan 9 kernel.
-Almost any kernel driver
-.RB ( \*9/src/9/*/dev*.c )
-is a good example.
-.SH SOURCE
-.B \*9/src/lib9p/parse.c
-.SH SEE ALSO
-.IR 9p (3)