128 lines
5.1 KiB
HTML
128 lines
5.1 KiB
HTML
<head>
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<title>9p-cmdbuf(3) - Plan 9 from User Space</title>
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<meta content="text/html; charset=utf-8" http-equiv=Content-Type>
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</head>
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<body bgcolor=#ffffff>
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<table border=0 cellpadding=0 cellspacing=0 width=100%>
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<tr height=10><td>
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<tr><td width=20><td>
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<tr><td width=20><td><b>9P-CMDBUF(3)</b><td align=right><b>9P-CMDBUF(3)</b>
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<tr><td width=20><td colspan=2>
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<br>
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<p><font size=+1><b>NAME </b></font><br>
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<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
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Cmdbuf, parsecmd, respondcmderror, lookupcmd – control message
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parsing<br>
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</table>
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<p><font size=+1><b>SYNOPSIS </b></font><br>
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<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
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<tt><font size=+1>#include <u.h><br>
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#include <libc.h><br>
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#include <fcall.h><br>
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#include <thread.h><br>
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#include <9p.h><br>
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<table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
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typedef struct Cmdbuf<br>
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{<br>
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<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
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char *buf;<br>
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char **f;<br>
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int nf;<br>
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</table>
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} Cmdbuf;<br>
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typedef struct Cmdtab<br>
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{<br>
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<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
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int index;<br>
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char *cmd;<br>
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int narg;<br>
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</table>
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};<br>
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Cmdbuf *parsecmd(char *p, int n)<br>
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Cmdtab *lookupcmd(Cmdbuf *cb, Cmdtab *tab, int ntab)<br>
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void respondcmderror(Req *r, Cmdbuf *cb, char *fmt, ...)<br>
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</font></tt>
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</table>
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<p><font size=+1><b>DESCRIPTION </b></font><br>
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<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
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These data structures and functions provide parsing of textual
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control messages.
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<table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
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<i>Parsecmd</i> treats the <i>n</i> bytes at <i>p</i> (which need not be NUL-terminated)
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as a UTF string and splits it using <i>tokenize</i> (see <a href="../man3/getfields.html"><i>getfields</i>(3)</a>).
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It returns a <tt><font size=+1>Cmdbuf</font></tt> structure holding pointers to each field in
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the message.
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<table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
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<i>Lookupcmd</i> walks through the array <i>ctab</i>, which has <i>ntab</i> entries,
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looking for the first <tt><font size=+1>Cmdtab</font></tt> that matches the parsed command.
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(If the parsed command is empty, <i>lookupcmd</i> returns nil immediately.)
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A <tt><font size=+1>Cmdtab</font></tt> matches the command if <i>cmd</i> is equal to <i>cb</i><tt><font size=+1>−></font></tt><i>f</i><tt><font size=+1>[0]</font></tt> or if
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<i>cmd</i> is <tt><font size=+1>*</font></tt>. Once a matching <tt><font size=+1>Cmdtab</font></tt> has been
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found, if <i>narg</i> is not zero, then the parsed command must have
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exactly <i>narg</i> fields (including the command string itself). If
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the command has the wrong number of arguments, <i>lookupcmd</i> returns
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nil. Otherwise, it returns a pointer to the <tt><font size=+1>Cmdtab</font></tt> entry. If <i>lookupcmd</i>
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does not find a matching command at all, it returns
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nil. Whenever <i>lookupcmd</i> returns nil, it sets the system error
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string.
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<table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
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<i>Respondcmderror</i> resoponds to request <i>r</i> with an error of the form
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‘<i>fmt</i>: <i>cmd</i>,’ where <i>fmt</i> is the formatted string and <i>cmd</i> is a reconstruction
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of the parsed command. Fmt is often simply <tt><font size=+1>%r .<br>
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</font></tt>
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</table>
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<p><font size=+1><b>EXAMPLES </b></font><br>
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<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
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This interface is not used in any distributed 9P servers. It was
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lifted from the Plan 9 kernel. Almost any Plan 9 kernel driver
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(<tt><font size=+1>/sys/src/9/*/dev*.c</font></tt> on Plan 9) is a good example.<br>
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</table>
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<p><font size=+1><b>SOURCE </b></font><br>
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<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
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<tt><font size=+1>/usr/local/plan9/src/lib9p/parse.c<br>
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</font></tt>
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</table>
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<p><font size=+1><b>SEE ALSO </b></font><br>
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<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
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<a href="../man3/9p.html"><i>9p</i>(3)</a><br>
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</table>
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<td width=20>
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<tr height=20><td>
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</table>
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<!-- TRAILER -->
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<table border=0 cellpadding=0 cellspacing=0 width=100%>
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<tr height=15><td width=10><td><td width=10>
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<tr><td><td>
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<center>
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<a href="../../"><img src="../../dist/spaceglenda100.png" alt="Space Glenda" border=1></a>
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</center>
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</table>
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<!-- TRAILER -->
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