+
+/*
+ * Used to declare a structure unaligned, so that the C compiler,
+ * if necessary, generates code that doesn't assume alignment.
+ * This is required because there is no guarantee that the packet
+ * data we get from libpcap/WinPcap is properly aligned.
+ *
+ * This assumes that, for all compilers that support __attribute__:
+ *
+ * 1) they support __attribute__((packed));
+ *
+ * 2) for all instruction set architectures requiring strict
+ * alignment, declaring a structure with that attribute
+ * causes the compiler to generate code that handles
+ * misaligned 2-byte, 4-byte, and 8-byte integral
+ * quantities.
+ *
+ * It does not (yet) handle compilers where you can get the compiler
+ * to generate code of that sort by some other means.
+ *
+ * This is required in order to, for example, keep the compiler from
+ * generating, for
+ *
+ * if (bp->bp_htype == 1 && bp->bp_hlen == 6 && bp->bp_op == BOOTPREQUEST) {
+ *
+ * in print-bootp.c, code that loads the first 4-byte word of a
+ * "struct bootp", masking out the bp_hops field, and comparing the result
+ * against 0x01010600.
+ *
+ * Note: this also requires that padding be put into the structure,
+ * at least for compilers where it's implemented as __attribute__((packed)).
+ */
+#define UNALIGNED __attribute__((packed))
+
+#if defined(WIN32) || defined(MSDOS)
+ #define FOPEN_READ_TXT "rt"
+ #define FOPEN_READ_BIN "rb"
+ #define FOPEN_WRITE_TXT "wt"
+ #define FOPEN_WRITE_BIN "wb"
+#else
+ #define FOPEN_READ_TXT "r"
+ #define FOPEN_READ_BIN FOPEN_READ_TXT
+ #define FOPEN_WRITE_TXT "w"
+ #define FOPEN_WRITE_BIN FOPEN_WRITE_TXT
+#endif
+
+#if defined(__GNUC__) && defined(__i386__) && !defined(__ntohl)
+ #undef ntohl
+ #undef ntohs
+ #undef htonl
+ #undef htons
+
+ static __inline__ unsigned long __ntohl (unsigned long x);
+ static __inline__ unsigned short __ntohs (unsigned short x);
+
+ #define ntohl(x) __ntohl(x)
+ #define ntohs(x) __ntohs(x)
+ #define htonl(x) __ntohl(x)
+ #define htons(x) __ntohs(x)
+
+ static __inline__ unsigned long __ntohl (unsigned long x)
+ {
+ __asm__ ("xchgb %b0, %h0\n\t" /* swap lower bytes */
+ "rorl $16, %0\n\t" /* swap words */
+ "xchgb %b0, %h0" /* swap higher bytes */
+ : "=q" (x) : "0" (x));
+ return (x);
+ }
+
+ static __inline__ unsigned short __ntohs (unsigned short x)
+ {
+ __asm__ ("xchgb %b0, %h0" /* swap bytes */
+ : "=q" (x) : "0" (x));
+ return (x);
+ }
+#endif
+
+#ifndef INET_ADDRSTRLEN
+#define INET_ADDRSTRLEN 16
+#endif
+
+#ifndef TRUE
+#define TRUE 1
+#endif
+
+#ifndef FALSE
+#define FALSE 0
+#endif
+
+#endif /* tcpdump_stdinc_h */
projects / tcpdump / blobdiff