Hi,

gcvt(3) is documented as being MT-, AS-, and AC-Safe.  However, the
following code calls sprintf(3), which is not safe.

	$ grepc __GCVT .
	./misc/efgcvt-template.c:char *
	__GCVT (FLOAT_TYPE value, int ndigit, char *buf)
	{
	  SPRINTF (buf, "%.*" FLOAT_FMT_FLAG "g", MIN (ndigit, NDIGIT_MAX), value);
	  return buf;
	}
	./misc/qefgcvt.c:#define __GCVT __qgcvt
	./misc/efgcvt.c:#define __GCVT __gcvt
	./sysdeps/ieee754/ldbl-128ibm-compat/ieee128-qefgcvt.c:#define __GCVT ___qgcvtieee128

Is that subset of sprintf(3) functionality safe?

Have a lovely day!
Alex

-- 
<https://www.alejandro-colomar.es/>