make setjmp fit on one page

d6d636aa · rsc · ab299eb3 · d6d636aa
--- a/setjmp.S
+++ b/setjmp.S
 #   int  setjmp(struct jmpbuf *jmp);
 #   void longjmp(struct jmpbuf *jmp);
 # 
-# Setjmp saves its stack environment in jmp
+# Setjmp saves its stack environment in jmp for later use by longjmp.
-# for later use by longjmp.  It returns 0.
+# It returns 0.
 # 
-# Longjmp restores the environment saved by
+# Longjmp restores the environment saved by the last call of setjmp.
-# the last call of setjmp. It then causes 
+# It then causes execution to continue as if the call of setjmp
-# execution to continue as if the call of setjmp
 # had just returned 1.
 # 
-# The caller of setjmp must not itself have
+# The caller of setjmp must not itself have returned in the interim.
-# returned in the interim.  All accessible data
+# All accessible data have values as of the time longjmp was called.
-# have values as of the time longjmp was called.
 #
 #    [Description, but not code, borrowed from Plan 9.]