include: bits conditionalize behavior on HAVE_SNPRINTF

ee2a92c547 ("bits: Fix warnings")
introduced unconditional use of snprintf().   Use of snprintf in
most of the tree is acceptable whenever roken is available because
roken provides snprintf() for platforms that do not provide it.
However, bits.c cannot use roken and therefore must not
unconditionally call snprintf().

This change restores the prior implementation of BITSIZE(TYPE)
when HAVE_SNPRINTF is undefined.

Change-Id: Ibbd2f003abe9f9fb612719266544cfd545809a18

include/bits.c

@@ -46,6 +46,7 @@ RCSID("$Id$");
 #include <ws2tcpip.h>
 #endif
 
+#ifdef HAVE_SNPRINTF
 #define BITSIZE(TYPE)							\
 {									\
     int b = 0; TYPE x = 1, zero = 0; const char *pre = "u";		\
@@ -62,7 +63,25 @@ RCSID("$Id$");
         return;                                                 	\
     }									\
 }
-
+#else
+#define BITSIZE(TYPE)                                          \
+{                                                              \
+    int b = 0; TYPE x = 1, zero = 0; const char *pre = "u";    \
+    char tmp[128], tmp2[128];                                  \
+    while(x){ x <<= 1; b++; if(x < zero) pre=""; }             \
+    if(b >= len){                                              \
+        size_t tabs;                                           \
+        sprintf(tmp, "%sint%d_t" , pre, len);                  \
+        sprintf(tmp2, "typedef %s %s;", #TYPE, tmp);           \
+        tabs = 5 - strlen(tmp2) / 8;                           \
+        fprintf(f, "%s", tmp2);                                \
+	while(tabs-- > 0)                                      \
+	    fprintf(f, "\t");                                  \
+        fprintf(f, "/* %2d bits */\n", b);                     \
+        return;                                                \
+    }							       \
+}
+#endif
 #ifndef HAVE___ATTRIBUTE__
 #define __attribute__(x)
 #endif