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authorMattias Andrée <maandree@member.fsf.org>2015-12-20 14:31:40 +0100
committerMattias Andrée <maandree@member.fsf.org>2015-12-20 14:31:40 +0100
commit679b8bdb5c40ca1909b025db10ddb5a98967c60e (patch)
treef0c051e0569138a5c292e30892001604b65f851f /gen/bits
parentfix issue #8 on github (diff)
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optimise implementations of {hton,ntoh}{s,l,ll}
Signed-off-by: Mattias Andrée <maandree@member.fsf.org>
Diffstat (limited to 'gen/bits')
-rw-r--r--gen/bits/intconf.c82
-rw-r--r--gen/bits/intconf.h18
2 files changed, 100 insertions, 0 deletions
diff --git a/gen/bits/intconf.c b/gen/bits/intconf.c
index 5a52d12..361dd16 100644
--- a/gen/bits/intconf.c
+++ b/gen/bits/intconf.c
@@ -140,6 +140,82 @@ static int fast(int bits)
/**
+ * For a 16-bit integer with the value 0x0102, print,
+ * to a string, the bytes it is constructed by one the
+ * host machine, in storage order.
+ *
+ * @return The bytes in the integer juxtaposed.
+ */
+static char* byteorder_16(void)
+{
+ static char buf[16 / 4 + 1];
+ union
+ {
+ short int all;
+ struct
+ {
+ char a; char b;
+ };
+ } test = { .all = 0x0102 };
+
+ sprintf(buf, "%02i%02i", test.a, test.b);
+ return buf;
+}
+
+
+/**
+ * For a 32-bit integer with the value 0x01020304, print,
+ * to a string, the bytes it is constructed by one the
+ * host machine, in storage order.
+ *
+ * @return The bytes in the integer juxtaposed.
+ */
+static char* byteorder_32(void)
+{
+ static char buf[32 / 4 + 1];
+ union
+ {
+ int all;
+ struct
+ {
+ char a; char b; char c; char d;
+ };
+ } test = { .all = 0x01020304 };
+
+ sprintf(buf, "%02i%02i%02i%02i",
+ test.a, test.b, test.c, test.d);
+ return buf;
+}
+
+
+/**
+ * For a 16-bit integer with the value 0x0102030405060708,
+ * print, to a string, the bytes it is constructed by one
+ * the host machine, in storage order.
+ *
+ * @return The bytes in the integer juxtaposed.
+ */
+static char* byteorder_64(void)
+{
+ static char buf[64 / 4 + 1];
+ union
+ {
+ long long int all;
+ struct
+ {
+ char a; char b; char c; char d;
+ char e; char f; char g; char h;
+ };
+ } test = { .all = 0x0102030405060708LL };
+
+ sprintf(buf, "%02i%02i%02i%02i%02i%02i%02i%02i",
+ test.a, test.b, test.c, test.d,
+ test.e, test.f, test.g, test.h);
+ return buf;
+}
+
+
+/**
* @param argc The number of command line arguments, should
* be either 1 (print integer width information)
* or 2 (otherwise).
@@ -167,12 +243,18 @@ int main(int argc, char* argv[])
r |= printf("PTR_BIT %zu\n", 8 * sizeof(void*));
r |= printf("WCHAR_BIT %zu\n", 8 * sizeof(L'\0'));
+ /* Print byte orders. */
+ r |= printf("INT16_BYTEORDER 0x%s\n", byteorder_16());
+ r |= printf("INT32_BYTEORDER 0x%s\n", byteorder_32());
+ r |= printf("INT64_BYTEORDER 0x%sLL\n", byteorder_64());
+
/* Print the intrinsic type for specific numbers of bits. */
r |= printf("INT%zu %s\n", 8 * sizeof(char), "char");
r |= printf("INT%zu %s\n", 8 * sizeof(short int), "short int");
r |= printf("INT%zu %s\n", 8 * sizeof(int), "int");
r |= printf("INT%zu %s\n", 8 * sizeof(long int), "long int");
r |= printf("INT%zu %s\n", 8 * sizeof(long long int), "long long int");
+
return r < 0 ? 1 : 0;
}
else if (argc == 2)
diff --git a/gen/bits/intconf.h b/gen/bits/intconf.h
index 69ea473..4d22435 100644
--- a/gen/bits/intconf.h
+++ b/gen/bits/intconf.h
@@ -97,6 +97,24 @@
#define __WCHAR_BIT //(bin/gen/bits/intconf | grep ^WCHAR_BIT | sed "s/^[^ ]* //")
/**
+ * The 16-bit integer 0x0102 but with the
+ * bytes swapped to the storage order.
+ */
+#define __INT16_BYTEORDER //(bin/gen/bits/intconf | grep ^INT16_BYTEORDER | sed "s/^[^ ]* //")
+
+/**
+ * The 32-bit integer 0x01020304 but with
+ * the bytes swapped to the storage order.
+ */
+#define __INT32_BYTEORDER //(bin/gen/bits/intconf | grep ^INT32_BYTEORDER | sed "s/^[^ ]* //")
+
+/**
+ * The 64-bit integer 0x0102030405060708 but with
+ * the bytes swapped to the storage order.
+ */
+#define __INT64_BYTEORDER //(bin/gen/bits/intconf | grep ^INT64_BYTEORDER | sed "s/^[^ ]* //")
+
+/**
* The underlaying intrinsic type for `int8_t` or `uint8_t`.
*/
#define __INT8 //(bin/gen/bits/intconf | grep ^INT8 | sed "s/^[^ ]* //" | sed 1q)