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stop fiddling with path construction.

There's fd2path, which gives back the full path directly.
This makes the code even simpler.

--- a/sys/src/cmd/yacc.c

+++ b/sys/src/cmd/yacc.c

@@ -143,7 +143,7 @@

 	/* communication variables between various I/O routines */

 char*	infile;			/* input file name */

-char*	inpath;			/* input full path */

+char	inpath[1024];		/* input full path */

 int	numbval;		/* value of an input number */

 char	tokname[NAMESIZE+UTFmax+1];	/* input token name, slop for runes and 0 */

@@ -1185,7 +1185,7 @@

 	long c, t;

 	int i, j, lev, ty, ytab, *p;

 	int vflag, dflag, stem;

-	char actnm[8], *stemc, dirbuf[512];

+	char actnm[8], *stemc;

 	ytab = 0;

 	vflag = 0;

@@ -1231,16 +1231,12 @@

 	if(argc < 1)

 		error("no input file");

-	dirbuf[0] = '\0';

 	infile = argv[0];

-	if(infile[0] != '/' && getwd(dirbuf, sizeof dirbuf)==nil)

-		error("cannot get cwd");

-	inpath = smprint("%s/%s", dirbuf, infile);

-	cleanname(inpath);

-

-	finput = Bopen(inpath, OREAD);

+	finput = Bopen(infile, OREAD);

 	if(finput == 0)

 		error("cannot open '%s'", argv[0]);

+	if(fd2path(Bfildes(finput), inpath, sizeof(inpath)) == -1)

+		error("cannot get path for %s", infile);

 	Blethal(finput, nil);

 	cnamp = cnames;

-- 

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