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tput: check sbrk return value

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

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

@@ -36,6 +36,8 @@

 	bc = 0;

 	sec = 0;

 	buf = sbrk(buflen);

+	if(buf == (void*)-1)

+		sysfatal("out of memory");

 	cpid = rfork(RFPROC | RFMEM);

 	if(cpid == 0) {

 		while(1) {

-- 

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