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WebSVN – planix.SVN – Blame – /os/branches/feature_fixcpp/sys/src/ape/lib/ap/plan9/9iounit.c – Rev 2

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#include "lib.h"
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#include <string.h>
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#include <stdlib.h>
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#include <fmt.h>
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#include "sys9.h"
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#include "dir.h"
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/*
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 * Format:
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  3 r  M    4 (0000000000457def 11 00)   8192      512 /rc/lib/rcmain
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 */
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static int
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getfields(char *str, char **args, int max, int mflag)
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{
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	char r;
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	int nr, intok, narg;
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	if(max <= 0)
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		return 0;
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	narg = 0;
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	args[narg] = str;
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	if(!mflag)
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		narg++;
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	intok = 0;
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	for(;;) {
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		nr = 1;			/* utf bytes in this rune */
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		r = *str++;
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		if(r == 0)
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			break;
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		if(r == ' ' || r == '\t'){
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			if(narg >= max)
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				break;
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			*str = 0;
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			intok = 0;
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			args[narg] = str + nr;
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			if(!mflag)
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				narg++;
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		} else {
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			if(!intok && mflag)
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				narg++;
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			intok = 1;
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		}
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	}
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	return narg;
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}
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int
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_IOUNIT(int fd)
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{
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	int i, cfd;
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	char buf[128], *args[10];
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	snprint(buf, sizeof buf, "#d/%dctl", fd);
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	cfd = _OPEN(buf, OREAD);
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	if(cfd < 0)
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		return 0;
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	i = _READ(cfd, buf, sizeof buf-1);
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	_CLOSE(cfd);
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	if(i <= 0)
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		return 0;
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	buf[i] = '\0';
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	if(getfields(buf, args, 10, 1) != 10)
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		return 0;
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	return atoi(args[7]);
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}