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acme: use global user string variable instead of getuser()

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

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

@@ -329,7 +329,7 @@

 	if(pipe(pfd) < 0)

 		error("can't create pipe");

-	sprint(acmeerrorfile, "/srv/acme.%s.%d", getuser(), mainpid);

+	sprint(acmeerrorfile, "/srv/acme.%s.%d", user, mainpid);

 	fd = create(acmeerrorfile, OWRITE, 0666);

 	if(fd < 0){

 		remove(acmeerrorfile);

--- a/sys/src/cmd/acme/dat.h

+++ b/sys/src/cmd/acme/dat.h

@@ -538,6 +538,7 @@

 Buffer		snarfbuf;

 Rectangle		nullrect;

 int			fsyspid;

+char			*user;

 char			*cputype;

 char			*objtype;

 char			*home;

--- a/sys/src/cmd/acme/disk.c

+++ b/sys/src/cmd/acme/disk.c

@@ -19,7 +19,7 @@

 	char buf[128];

 	int i, fd;

-	snprint(buf, sizeof buf, "/tmp/X%d.%.4sacme", getpid(), getuser());

+	snprint(buf, sizeof buf, "/tmp/X%d.%.4sacme", getpid(), user);

 	for(i='A'; i<='Z'; i++){

 		buf[5] = i;

 		if(access(buf, AEXIST) == 0)

--- a/sys/src/cmd/acme/rows.c

+++ b/sys/src/cmd/acme/rows.c

@@ -667,7 +667,7 @@

 		textinsert(&w->tag, w->tag.file->nc, r+n+1, nr-(n+1), TRUE);

 		if(ndumped >= 0){

 			/* simplest thing is to put it in a file and load that */

-			sprint(buf, "/tmp/d%d.%.4sacme", getpid(), getuser());

+			sprint(buf, "/tmp/d%d.%.4sacme", getpid(), user);

 			fd = create(buf, OWRITE|ORCLOSE, 0600);

 			if(fd < 0){

 				free(r);