1 files changed, 53 insertions, 32 deletions
diff --git a/pcap/pcap-inttypes.h b/pcap/pcap-inttypes.h
index 1cfa0bfc..8c7b4f65 100644
--- a/pcap/pcap-inttypes.h
+++ b/pcap/pcap-inttypes.h
@@ -32,8 +32,8 @@
 #define pcap_pcap_inttypes_h
 
 /*
- * If we're compiling with Visual Studio, make sure we have at least
- * VS 2015 or later, so we have sufficient C99 support.
+ * If we're compiling with Visual Studio, make sure the C99 integer
+ * types are defined, by hook or by crook.
  *
  * XXX - verify that we have at least C99 support on UN*Xes?
  *
@@ -42,39 +42,60 @@
  */
 #if defined(_MSC_VER)
   /*
-   * Compiler is MSVC.  Make sure we have VS 2015 or later.
+   * Compiler is MSVC.
    */
-  #if _MSC_VER < 1900
-    #error "Building libpcap requires VS 2015 or later"
+  #if _MSC_VER >= 1800
+    /*
+     * VS 2013 or newer; we have <inttypes.h>.
+     */
+    #include <inttypes.h>
+  #else
+    /*
+     * Earlier VS; we have to define this stuff ourselves.
+     * We don't support building libpcap with earlier versions of VS,
+     * but SDKs for Npcap have to support building applications using
+     * earlier versions of VS, so we work around this by defining
+     * those types ourselves, as some files use them.
+     */
+    typedef unsigned char uint8_t;
+    typedef signed char int8_t;
+    typedef unsigned short uint16_t;
+    typedef signed short int16_t;
+    typedef unsigned int uint32_t;
+    typedef signed int int32_t;
+    #ifdef _MSC_EXTENSIONS
+      typedef unsigned _int64 uint64_t;
+      typedef _int64 int64_t;
+    #else /* _MSC_EXTENSIONS */
+      typedef unsigned long long uint64_t;
+      typedef long long int64_t;
+    #endif
   #endif
-#endif
-
-/*
- * Include <inttypes.h> to get the integer types and PRi[doux]64 values
- * defined.
- *
- * If the compiler is MSVC, we require VS 2015 or newer, so we
- * have <inttypes.h> - and support for %zu in the formatted
- * printing functions.
- *
- * If the compiler is MinGW, we assume we have <inttypes.h> - and
- * support for %zu in the formatted printing functions.
- *
- * If the target is UN*X, we assume we have a C99-or-later development
- * environment, and thus have <inttypes.h> - and support for %zu in
- * the formatted printing functions.
- *
- * If the target is MS-DOS, we assume we have <inttypes.h> - and support
- * for %zu in the formatted printing functions.
- *
- * I.e., assume we have <inttypes.h> and that it suffices.
- */
+#else /* defined(_MSC_VER) */
+  /*
+   * Not Visual Studio.
+   * Include <inttypes.h> to get the integer types and PRi[doux]64 values
+   * defined.
+   *
+   * If the compiler is MinGW, we assume we have <inttypes.h> - and
+   * support for %zu in the formatted printing functions.
+   *
+   * If the target is UN*X, we assume we have a C99-or-later development
+   * environment, and thus have <inttypes.h> - and support for %zu in
+   * the formatted printing functions.
+   *
+   * If the target is MS-DOS, we assume we have <inttypes.h> - and support
+   * for %zu in the formatted printing functions.
+   *
+   * I.e., assume we have <inttypes.h> and that it suffices.
+   */
 
-/*
- * XXX - somehow make sure we have enough C99 support with other
- * compilers and support libraries?
- */
+  /*
+   * XXX - somehow make sure we have enough C99 support with other
+   * compilers and support libraries?
+   */
 
-#include <inttypes.h>
+  #include <inttypes.h>
+#endif /* defined(_MSC_VER) */
 
 #endif /* pcap/pcap-inttypes.h */