100% unit test coverage

scan_asn1int.c

@@ -2,9 +2,39 @@
 
 size_t scan_asn1int(const char* src,const char* max,enum asn1_tagclass* tc,enum asn1_tagtype* tt,unsigned long* tag,signed long* l) {
   size_t len,tmp,tlen;
-  if (!(len=scan_asn1tag(src,max,tc,tt,tag))) return 0;
-  if (!(tmp=scan_asn1length(src+len,max,&tlen))) return 0;
+  if (!(len=scan_asn1tag(src,max,tc,tt,tag)))
+    return 0;
+  if (!(tmp=scan_asn1length(src+len,max,&tlen)))
+    return 0;
   len+=tmp;
-  if (!(scan_asn1rawint(src+len,max,tlen,l))) return 0;
+  if (!(scan_asn1rawint(src+len,max,tlen,l)))
+    return 0;
   return len+tlen;
 }
+
+#ifdef UNITTEST
+#include <string.h>
+#include <assert.h>
+
+#undef UNITTEST
+#include "scan_asn1tag.c"
+#include "scan_asn1tagint.c"
+#include "scan_asn1length.c"
+#include "scan_asn1rawint.c"
+
+int main() {
+  char buf[100];
+  enum asn1_tagclass tc;
+  enum asn1_tagtype tt;
+  unsigned long tag;
+  signed long l;
+  strcpy(buf,"\x02\x01\x01");
+  assert(scan_asn1int(buf,buf+3,&tc,&tt,&tag,&l)==3 && tc==UNIVERSAL && tt==PRIMITIVE && tag==INTEGER && l==1);
+  assert(scan_asn1int(buf,buf,&tc,&tt,&tag,&l)==0);	// not enough input, first return 0
+  assert(scan_asn1int(buf,buf+2,&tc,&tt,&tag,&l)==0);	// not enough input, second return 0
+  strcpy(buf,"\x02\x02\x00\x01");
+  assert(scan_asn1int(buf,buf+3,&tc,&tt,&tag,&l)==0);	// not enough input, second return 0
+  assert(scan_asn1int(buf,buf+4,&tc,&tt,&tag,&l)==0);	// non-minimally encoded raw int, third return
+  // we only care for 100% coverage of this file, the others have their own unit tests */
+}
+#endif