Improve and simplify function and header detection logic.

Simplify autoconf checks by using AC_CHECK_FUNCS/HEADERS.
Clarify some ambiguous dependencies around strnlen/strndup.
Unconditionally enable pidwraptest for all arc4random implementations.
Remove HAVE_VASPRINTF conditional, since asprintf requires vasprintf.

ok @doug

1 files changed, 3 insertions, 3 deletions

diff --git a/include/stdlib.h b/include/stdlib.h
index c314f38..1a1cb6c 100644
--- a/include/stdlib.h
+++ b/include/stdlib.h
@@ -7,16 +7,16 @@
 #include <sys/time.h>
 #include <stdint.h>
 
-#ifdef NO_ARC4RANDOM_BUF
+#ifndef HAVE_ARC4RANDOM_BUF
 uint32_t arc4random(void);
 void arc4random_buf(void *_buf, size_t n);
 #endif
 
-#ifdef NO_REALLOCARRAY
+#ifndef HAVE_REALLOCARRAY
 void *reallocarray(void *, size_t, size_t);
 #endif
 
-#ifdef NO_STRTONUM
+#ifndef HAVE_STRTONUM
 long long strtonum(const char *nptr, long long minval,
                 long long maxval, const char **errstr);
 #endif