tuklib_integer: Rename bswapXX to byteswapXX

The __builtin_bswapXX from GCC and Clang are preferred when
they are available. This can allow compilers to emit the x86 MOVBE
instruction instead of doing a load + byteswap as two instructions
(which would happen if the byteswapping is done in inline asm).

bswap16, bswap32, and bswap64 exist in system headers on *BSDs
and Darwin. #defining bswap16 on NetBSD results in a warning about
macro redefinition. It's safest to avoid this namespace conflict
completely.

No OS supported by tuklib_integer.h uses byteswapXX names and
a web search doesn't immediately find any obvious danger of
namespace conflicts. So let's try these still-pretty-short names
for the macros.

Thanks to Sam James for pointing out the compiler warning on
NetBSD 10.0.

(cherry picked from commit 4ffc60f323)

src/common/tuklib_integer.h

@@ -16,7 +16,7 @@
 ///
 /// Endianness-converting integer operations (these can be macros!)
 /// (XX = 16, 32, or 64; Y = b or l):
-///   - Byte swapping: bswapXX(num)
+///   - Byte swapping: byteswapXX(num)
 ///   - Byte order conversions to/from native (byteswaps if Y isn't
 ///     the native endianness): convXXYe(num)
 ///   - Unaligned reads: readXXYe(ptr)
@@ -66,38 +66,41 @@
 
 #if defined(HAVE___BUILTIN_BSWAPXX)
 	// GCC >= 4.8 and Clang
-#	define bswap16(n) __builtin_bswap16(n)
-#	define bswap32(n) __builtin_bswap32(n)
-#	define bswap64(n) __builtin_bswap64(n)
+#	define byteswap16(num) __builtin_bswap16(num)
+#	define byteswap32(num) __builtin_bswap32(num)
+#	define byteswap64(num) __builtin_bswap64(num)
 
 #elif defined(HAVE_BYTESWAP_H)
 	// glibc, uClibc, dietlibc
 #	include <byteswap.h>
 #	ifdef HAVE_BSWAP_16
-#		define bswap16(num) bswap_16(num)
+#		define byteswap16(num) bswap_16(num)
 #	endif
 #	ifdef HAVE_BSWAP_32
-#		define bswap32(num) bswap_32(num)
+#		define byteswap32(num) bswap_32(num)
 #	endif
 #	ifdef HAVE_BSWAP_64
-#		define bswap64(num) bswap_64(num)
+#		define byteswap64(num) bswap_64(num)
 #	endif
 
 #elif defined(HAVE_SYS_ENDIAN_H)
 	// *BSDs and Darwin
 #	include <sys/endian.h>
+#	define byteswap16(num) bswap16(num)
+#	define byteswap32(num) bswap32(num)
+#	define byteswap64(num) bswap64(num)
 
 #elif defined(HAVE_SYS_BYTEORDER_H)
 	// Solaris
 #	include <sys/byteorder.h>
 #	ifdef BSWAP_16
-#		define bswap16(num) BSWAP_16(num)
+#		define byteswap16(num) BSWAP_16(num)
 #	endif
 #	ifdef BSWAP_32
-#		define bswap32(num) BSWAP_32(num)
+#		define byteswap32(num) BSWAP_32(num)
 #	endif
 #	ifdef BSWAP_64
-#		define bswap64(num) BSWAP_64(num)
+#		define byteswap64(num) BSWAP_64(num)
 #	endif
 #	ifdef BE_16
 #		define conv16be(num) BE_16(num)
@@ -119,15 +122,15 @@
 #	endif
 #endif
 
-#ifndef bswap16
-#	define bswap16(n) (uint16_t)( \
+#ifndef byteswap16
+#	define byteswap16(n) (uint16_t)( \
 		  (((n) & 0x00FFU) << 8) \
 		| (((n) & 0xFF00U) >> 8) \
 	)
 #endif
 
-#ifndef bswap32
-#	define bswap32(n) (uint32_t)( \
+#ifndef byteswap32
+#	define byteswap32(n) (uint32_t)( \
 		  (((n) & UINT32_C(0x000000FF)) << 24) \
 		| (((n) & UINT32_C(0x0000FF00)) << 8) \
 		| (((n) & UINT32_C(0x00FF0000)) >> 8) \
@@ -135,8 +138,8 @@
 	)
 #endif
 
-#ifndef bswap64
-#	define bswap64(n) (uint64_t)( \
+#ifndef byteswap64
+#	define byteswap64(n) (uint64_t)( \
 		  (((n) & UINT64_C(0x00000000000000FF)) << 56) \
 		| (((n) & UINT64_C(0x000000000000FF00)) << 40) \
 		| (((n) & UINT64_C(0x0000000000FF0000)) << 24) \
@@ -160,23 +163,23 @@
 #		define conv64be(num) ((uint64_t)(num))
 #	endif
 #	ifndef conv16le
-#		define conv16le(num) bswap16(num)
+#		define conv16le(num) byteswap16(num)
 #	endif
 #	ifndef conv32le
-#		define conv32le(num) bswap32(num)
+#		define conv32le(num) byteswap32(num)
 #	endif
 #	ifndef conv64le
-#		define conv64le(num) bswap64(num)
+#		define conv64le(num) byteswap64(num)
 #	endif
 #else
 #	ifndef conv16be
-#		define conv16be(num) bswap16(num)
+#		define conv16be(num) byteswap16(num)
 #	endif
 #	ifndef conv32be
-#		define conv32be(num) bswap32(num)
+#		define conv32be(num) byteswap32(num)
 #	endif
 #	ifndef conv64be
-#		define conv64be(num) bswap64(num)
+#		define conv64be(num) byteswap64(num)
 #	endif
 #	ifndef conv16le
 #		define conv16le(num) ((uint16_t)(num))

src/liblzma/check/crc32_fast.c

@@ -34,7 +34,7 @@ crc32_generic(const uint8_t *buf, size_t size, uint32_t crc)
 	crc = ~crc;
 
 #ifdef WORDS_BIGENDIAN
-	crc = bswap32(crc);
+	crc = byteswap32(crc);
 #endif
 
 	if (size > 8) {
@@ -80,7 +80,7 @@ crc32_generic(const uint8_t *buf, size_t size, uint32_t crc)
 		crc = lzma_crc32_table[0][*buf++ ^ A(crc)] ^ S8(crc);
 
 #ifdef WORDS_BIGENDIAN
-	crc = bswap32(crc);
+	crc = byteswap32(crc);
 #endif
 
 	return ~crc;

src/liblzma/check/crc32_tablegen.c

@@ -43,7 +43,7 @@ init_crc32_table(void)
 #ifdef WORDS_BIGENDIAN
 	for (size_t s = 0; s < 8; ++s)
 		for (size_t b = 0; b < 256; ++b)
-			crc32_table[s][b] = bswap32(crc32_table[s][b]);
+			crc32_table[s][b] = byteswap32(crc32_table[s][b]);
 #endif
 
 	return;

src/liblzma/check/crc64_fast.c

@@ -39,7 +39,7 @@ crc64_generic(const uint8_t *buf, size_t size, uint64_t crc)
 	crc = ~crc;
 
 #ifdef WORDS_BIGENDIAN
-	crc = bswap64(crc);
+	crc = byteswap64(crc);
 #endif
 
 	if (size > 4) {
@@ -73,7 +73,7 @@ crc64_generic(const uint8_t *buf, size_t size, uint64_t crc)
 		crc = lzma_crc64_table[0][*buf++ ^ A1(crc)] ^ S8(crc);
 
 #ifdef WORDS_BIGENDIAN
-	crc = bswap64(crc);
+	crc = byteswap64(crc);
 #endif
 
 	return ~crc;

src/liblzma/check/crc64_tablegen.c

@@ -42,7 +42,7 @@ init_crc64_table(void)
 #ifdef WORDS_BIGENDIAN
 	for (size_t s = 0; s < 4; ++s)
 		for (size_t b = 0; b < 256; ++b)
-			crc64_table[s][b] = bswap64(crc64_table[s][b]);
+			crc64_table[s][b] = byteswap64(crc64_table[s][b]);
 #endif
 
 	return;