Linus Walleij | b9256fd | 2006-02-15 09:40:43 +0000 | [diff] [blame] | 1 | dnl AC_NEED_BYTEORDER_H ( HEADER-TO-GENERATE ) |
Linus Walleij | b9256fd | 2006-02-15 09:40:43 +0000 | [diff] [blame] | 2 | dnl Copyright 2001-2002 by Dan Fandrich <dan@coneharvesters.com> |
| 3 | dnl This file may be copied and used freely without restrictions. No warranty |
| 4 | dnl is expressed or implied. |
| 5 | dnl |
| 6 | dnl Create a header file that guarantees that byte swapping macros of the |
| 7 | dnl ntohl variety as well as the extended types included in OpenBSD and |
| 8 | dnl NetBSD such as le32toh are defined. If possible, the standard ntohl |
| 9 | dnl are overloaded as they are optimized for the given platform, but when |
| 10 | dnl this is not possible (e.g. on a big-endian machine) they are defined |
| 11 | dnl in this file. |
| 12 | |
| 13 | dnl Look for a symbol in a header file |
| 14 | dnl AC_HAVE_SYMBOL ( IDENTIFIER, HEADER-FILE, ACTION-IF-FOUND, ACTION-IF-NOT-FOUND ) |
| 15 | AC_DEFUN([AC_HAVE_SYMBOL], |
| 16 | [ |
| 17 | AC_MSG_CHECKING(for $1 in $2) |
| 18 | AC_EGREP_CPP([symbol is present|\<$1\>],[ |
| 19 | #include <$2> |
| 20 | #ifdef $1 |
| 21 | symbol is present |
| 22 | #endif |
| 23 | ], |
| 24 | [AC_MSG_RESULT(yes) |
| 25 | $3 |
| 26 | ], |
| 27 | [AC_MSG_RESULT(no) |
| 28 | $4 |
| 29 | ])]) |
| 30 | |
| 31 | |
| 32 | dnl Create a header file that defines extended byte swapping macros |
| 33 | AC_DEFUN([AC_NEED_BYTEORDER_H], |
| 34 | [ |
| 35 | changequote(, )dnl |
| 36 | ac_dir=`echo $1|sed 's%/[^/][^/]*$%%'` |
| 37 | changequote([, ])dnl |
| 38 | if test "$ac_dir" != "$1" && test "$ac_dir" != .; then |
| 39 | # The file is in a subdirectory. |
| 40 | test ! -d "$ac_dir" && mkdir "$ac_dir" |
| 41 | fi |
| 42 | |
| 43 | # We're only interested in the target CPU, but it's not always set |
| 44 | effective_target="$target" |
| 45 | if test "x$effective_target" = xNONE -o "x$effective_target" = x ; then |
| 46 | effective_target="$host" |
| 47 | fi |
| 48 | AC_SUBST(effective_target) |
| 49 | |
| 50 | cat > "$1" << EOF |
| 51 | /* This file is generated automatically by configure */ |
| 52 | /* It is valid only for the system type ${effective_target} */ |
| 53 | |
| 54 | #ifndef __BYTEORDER_H |
| 55 | #define __BYTEORDER_H |
| 56 | |
| 57 | EOF |
| 58 | |
| 59 | dnl First, do an endian check |
| 60 | AC_C_BIGENDIAN |
| 61 | |
| 62 | dnl Look for NetBSD-style extended byte swapping macros |
| 63 | AC_HAVE_SYMBOL(le32toh,machine/endian.h, |
| 64 | [HAVE_LE32TOH=1 |
| 65 | cat >> "$1" << EOF |
| 66 | /* extended byte swapping macros are already available */ |
| 67 | #include <machine/endian.h> |
| 68 | |
| 69 | EOF], |
| 70 | |
| 71 | [ |
| 72 | |
| 73 | dnl Look for standard byte swapping macros |
| 74 | AC_HAVE_SYMBOL(ntohl,arpa/inet.h, |
| 75 | [cat >> "$1" << EOF |
| 76 | /* ntohl and relatives live here */ |
| 77 | #include <arpa/inet.h> |
| 78 | |
| 79 | EOF], |
| 80 | |
| 81 | [AC_HAVE_SYMBOL(ntohl,netinet/in.h, |
| 82 | [cat >> "$1" << EOF |
| 83 | /* ntohl and relatives live here */ |
| 84 | #include <netinet/in.h> |
| 85 | |
| 86 | EOF],true)]) |
| 87 | ]) |
| 88 | |
| 89 | dnl Look for generic byte swapping macros |
| 90 | |
| 91 | dnl OpenBSD |
| 92 | AC_HAVE_SYMBOL(swap32,machine/endian.h, |
| 93 | [cat >> "$1" << EOF |
| 94 | /* swap32 and swap16 are defined in machine/endian.h */ |
| 95 | |
| 96 | EOF], |
| 97 | |
| 98 | [ |
| 99 | dnl Linux GLIBC |
| 100 | AC_HAVE_SYMBOL(bswap_32,byteswap.h, |
| 101 | [cat >> "$1" << EOF |
| 102 | /* Define generic byte swapping functions */ |
| 103 | #include <byteswap.h> |
| 104 | #define swap16(x) bswap_16(x) |
| 105 | #define swap32(x) bswap_32(x) |
| 106 | #define swap64(x) bswap_64(x) |
| 107 | |
| 108 | EOF], |
| 109 | |
| 110 | [ |
| 111 | dnl NetBSD |
| 112 | AC_HAVE_SYMBOL(bswap32,machine/endian.h, |
| 113 | dnl We're already including machine/endian.h if this test succeeds |
| 114 | [cat >> "$1" << EOF |
| 115 | /* Define generic byte swapping functions */ |
| 116 | EOF |
| 117 | if test "$HAVE_LE32TOH" != "1"; then |
| 118 | echo '#include <machine/endian.h>'>> "$1" |
| 119 | fi |
| 120 | cat >> "$1" << EOF |
| 121 | #define swap16(x) bswap16(x) |
| 122 | #define swap32(x) bswap32(x) |
| 123 | #define swap64(x) bswap64(x) |
| 124 | |
| 125 | EOF], |
| 126 | |
| 127 | [ |
| 128 | dnl FreeBSD |
| 129 | AC_HAVE_SYMBOL(__byte_swap_long,sys/types.h, |
| 130 | [cat >> "$1" << EOF |
| 131 | /* Define generic byte swapping functions */ |
| 132 | #include <sys/types.h> |
| 133 | #define swap16(x) __byte_swap_word(x) |
| 134 | #define swap32(x) __byte_swap_long(x) |
| 135 | /* No optimized 64 bit byte swapping macro is available */ |
| 136 | #define swap64(x) ((uint64_t)(((uint64_t)(x) << 56) & 0xff00000000000000ULL | \\ |
| 137 | ((uint64_t)(x) << 40) & 0x00ff000000000000ULL | \\ |
| 138 | ((uint64_t)(x) << 24) & 0x0000ff0000000000ULL | \\ |
| 139 | ((uint64_t)(x) << 8) & 0x000000ff00000000ULL | \\ |
| 140 | ((x) >> 8) & 0x00000000ff000000ULL | \\ |
| 141 | ((x) >> 24) & 0x0000000000ff0000ULL | \\ |
| 142 | ((x) >> 40) & 0x000000000000ff00ULL | \\ |
| 143 | ((x) >> 56) & 0x00000000000000ffULL)) |
| 144 | |
| 145 | EOF], |
| 146 | |
| 147 | [ |
| 148 | dnl OS X |
| 149 | AC_HAVE_SYMBOL(NXSwapLong,machine/byte_order.h, |
| 150 | [cat >> "$1" << EOF |
| 151 | /* Define generic byte swapping functions */ |
| 152 | #include <machine/byte_order.h> |
| 153 | #define swap16(x) NXSwapShort(x) |
| 154 | #define swap32(x) NXSwapLong(x) |
| 155 | #define swap64(x) NXSwapLongLong(x) |
| 156 | |
| 157 | EOF], |
| 158 | [ |
| 159 | if test $ac_cv_c_bigendian = yes; then |
| 160 | cat >> "$1" << EOF |
| 161 | /* No other byte swapping functions are available on this big-endian system */ |
| 162 | #define swap16(x) ((uint16_t)(((x) << 8) | ((uint16_t)(x) >> 8))) |
| 163 | #define swap32(x) ((uint32_t)(((uint32_t)(x) << 24) & 0xff000000UL | \\ |
| 164 | ((uint32_t)(x) << 8) & 0x00ff0000UL | \\ |
| 165 | ((x) >> 8) & 0x0000ff00UL | \\ |
| 166 | ((x) >> 24) & 0x000000ffUL)) |
| 167 | #define swap64(x) ((uint64_t)(((uint64_t)(x) << 56) & 0xff00000000000000ULL | \\ |
| 168 | ((uint64_t)(x) << 40) & 0x00ff000000000000ULL | \\ |
| 169 | ((uint64_t)(x) << 24) & 0x0000ff0000000000ULL | \\ |
| 170 | ((uint64_t)(x) << 8) & 0x000000ff00000000ULL | \\ |
| 171 | ((x) >> 8) & 0x00000000ff000000ULL | \\ |
| 172 | ((x) >> 24) & 0x0000000000ff0000ULL | \\ |
| 173 | ((x) >> 40) & 0x000000000000ff00ULL | \\ |
| 174 | ((x) >> 56) & 0x00000000000000ffULL)) |
| 175 | |
| 176 | EOF |
| 177 | else |
| 178 | cat >> "$1" << EOF |
| 179 | /* Use these as generic byteswapping macros on this little endian system */ |
| 180 | #define swap16(x) ntohs(x) |
| 181 | #define swap32(x) ntohl(x) |
| 182 | /* No optimized 64 bit byte swapping macro is available */ |
| 183 | #define swap64(x) ((uint64_t)(((uint64_t)(x) << 56) & 0xff00000000000000ULL | \\ |
| 184 | ((uint64_t)(x) << 40) & 0x00ff000000000000ULL | \\ |
| 185 | ((uint64_t)(x) << 24) & 0x0000ff0000000000ULL | \\ |
| 186 | ((uint64_t)(x) << 8) & 0x000000ff00000000ULL | \\ |
| 187 | ((x) >> 8) & 0x00000000ff000000ULL | \\ |
| 188 | ((x) >> 24) & 0x0000000000ff0000ULL | \\ |
| 189 | ((x) >> 40) & 0x000000000000ff00ULL | \\ |
| 190 | ((x) >> 56) & 0x00000000000000ffULL)) |
| 191 | |
| 192 | EOF |
| 193 | fi |
| 194 | ]) |
| 195 | ]) |
| 196 | ]) |
| 197 | ]) |
| 198 | ]) |
| 199 | |
| 200 | |
| 201 | [ |
| 202 | if test "$HAVE_LE32TOH" != "1"; then |
| 203 | cat >> "$1" << EOF |
| 204 | /* The byte swapping macros have the form: */ |
| 205 | /* EENN[a]toh or htoEENN[a] where EE is be (big endian) or */ |
| 206 | /* le (little-endian), NN is 16 or 32 (number of bits) and a, */ |
| 207 | /* if present, indicates that the endian side is a pointer to an */ |
| 208 | /* array of uint8_t bytes instead of an integer of the specified length. */ |
| 209 | /* h refers to the host's ordering method. */ |
| 210 | |
| 211 | /* So, to convert a 32-bit integer stored in a buffer in little-endian */ |
| 212 | /* format into a uint32_t usable on this machine, you could use: */ |
| 213 | /* uint32_t value = le32atoh(&buf[3]); */ |
| 214 | /* To put that value back into the buffer, you could use: */ |
| 215 | /* htole32a(&buf[3], value); */ |
| 216 | |
| 217 | /* Define aliases for the standard byte swapping macros */ |
| 218 | /* Arguments to these macros must be properly aligned on natural word */ |
| 219 | /* boundaries in order to work properly on all architectures */ |
| 220 | #define htobe16(x) htons(x) |
| 221 | #define htobe32(x) htonl(x) |
| 222 | #define be16toh(x) ntohs(x) |
| 223 | #define be32toh(x) ntohl(x) |
| 224 | |
| 225 | #define HTOBE16(x) (x) = htobe16(x) |
| 226 | #define HTOBE32(x) (x) = htobe32(x) |
| 227 | #define BE32TOH(x) (x) = be32toh(x) |
| 228 | #define BE16TOH(x) (x) = be16toh(x) |
| 229 | |
| 230 | EOF |
| 231 | |
| 232 | if test $ac_cv_c_bigendian = yes; then |
| 233 | cat >> "$1" << EOF |
| 234 | /* Define our own extended byte swapping macros for big-endian machines */ |
| 235 | #define htole16(x) swap16(x) |
| 236 | #define htole32(x) swap32(x) |
| 237 | #define le16toh(x) swap16(x) |
| 238 | #define le32toh(x) swap32(x) |
| 239 | |
| 240 | #define htobe64(x) (x) |
| 241 | #define be64toh(x) (x) |
| 242 | |
| 243 | #define HTOLE16(x) (x) = htole16(x) |
| 244 | #define HTOLE32(x) (x) = htole32(x) |
| 245 | #define LE16TOH(x) (x) = le16toh(x) |
| 246 | #define LE32TOH(x) (x) = le32toh(x) |
| 247 | |
| 248 | #define HTOBE64(x) (void) (x) |
| 249 | #define BE64TOH(x) (void) (x) |
| 250 | |
| 251 | EOF |
| 252 | else |
| 253 | cat >> "$1" << EOF |
| 254 | /* On little endian machines, these macros are null */ |
| 255 | #define htole16(x) (x) |
| 256 | #define htole32(x) (x) |
| 257 | #define htole64(x) (x) |
| 258 | #define le16toh(x) (x) |
| 259 | #define le32toh(x) (x) |
| 260 | #define le64toh(x) (x) |
| 261 | |
| 262 | #define HTOLE16(x) (void) (x) |
| 263 | #define HTOLE32(x) (void) (x) |
| 264 | #define HTOLE64(x) (void) (x) |
| 265 | #define LE16TOH(x) (void) (x) |
| 266 | #define LE32TOH(x) (void) (x) |
| 267 | #define LE64TOH(x) (void) (x) |
| 268 | |
| 269 | /* These don't have standard aliases */ |
| 270 | #define htobe64(x) swap64(x) |
| 271 | #define be64toh(x) swap64(x) |
| 272 | |
| 273 | #define HTOBE64(x) (x) = htobe64(x) |
| 274 | #define BE64TOH(x) (x) = be64toh(x) |
| 275 | |
| 276 | EOF |
| 277 | fi |
| 278 | fi |
| 279 | |
| 280 | cat >> "$1" << EOF |
| 281 | /* Define the C99 standard length-specific integer types */ |
| 282 | #include "libptp-stdint.h" |
| 283 | |
| 284 | EOF |
| 285 | |
| 286 | case "${effective_target}" in |
| 287 | i[3456]86-*) |
| 288 | cat >> "$1" << EOF |
| 289 | /* Here are some macros to create integers from a byte array */ |
| 290 | /* These are used to get and put integers from/into a uint8_t array */ |
| 291 | /* with a specific endianness. This is the most portable way to generate */ |
| 292 | /* and read messages to a network or serial device. Each member of a */ |
| 293 | /* packet structure must be handled separately. */ |
| 294 | |
| 295 | /* The i386 and compatibles can handle unaligned memory access, */ |
| 296 | /* so use the optimized macros above to do this job */ |
| 297 | #define be16atoh(x) be16toh(*(uint16_t*)(x)) |
| 298 | #define be32atoh(x) be32toh(*(uint32_t*)(x)) |
| 299 | #define be64atoh(x) be64toh(*(uint64_t*)(x)) |
| 300 | #define le16atoh(x) le16toh(*(uint16_t*)(x)) |
| 301 | #define le32atoh(x) le32toh(*(uint32_t*)(x)) |
| 302 | #define le64atoh(x) le64toh(*(uint64_t*)(x)) |
| 303 | |
| 304 | #define htobe16a(a,x) *(uint16_t*)(a) = htobe16(x) |
| 305 | #define htobe32a(a,x) *(uint32_t*)(a) = htobe32(x) |
| 306 | #define htobe64a(a,x) *(uint64_t*)(a) = htobe64(x) |
| 307 | #define htole16a(a,x) *(uint16_t*)(a) = htole16(x) |
| 308 | #define htole32a(a,x) *(uint32_t*)(a) = htole32(x) |
| 309 | #define htole64a(a,x) *(uint64_t*)(a) = htole64(x) |
| 310 | |
| 311 | EOF |
| 312 | ;; |
| 313 | |
| 314 | *) |
| 315 | cat >> "$1" << EOF |
| 316 | /* Here are some macros to create integers from a byte array */ |
| 317 | /* These are used to get and put integers from/into a uint8_t array */ |
| 318 | /* with a specific endianness. This is the most portable way to generate */ |
| 319 | /* and read messages to a network or serial device. Each member of a */ |
| 320 | /* packet structure must be handled separately. */ |
| 321 | |
| 322 | /* Non-optimized but portable macros */ |
| 323 | #define be16atoh(x) ((uint16_t)(((x)[0]<<8)|(x)[1])) |
| 324 | #define be32atoh(x) ((uint32_t)(((x)[0]<<24)|((x)[1]<<16)|((x)[2]<<8)|(x)[3])) |
| 325 | #define be64atoh(x) ((uint64_t)(((x)[0]<<56)|((x)[1]<<48)|((x)[2]<<40)| \\ |
| 326 | ((x)[3]<<32)|((x)[4]<<24)|((x)[5]<<16)|((x)[6]<<8)|(x)[7])) |
| 327 | #define le16atoh(x) ((uint16_t)(((x)[1]<<8)|(x)[0])) |
| 328 | #define le32atoh(x) ((uint32_t)(((x)[3]<<24)|((x)[2]<<16)|((x)[1]<<8)|(x)[0])) |
| 329 | #define le64atoh(x) ((uint64_t)(((x)[7]<<56)|((x)[6]<<48)|((x)[5]<<40)| \\ |
| 330 | ((x)[4]<<32)|((x)[3]<<24)|((x)[2]<<16)|((x)[1]<<8)|(x)[0])) |
| 331 | |
| 332 | #define htobe16a(a,x) (a)[0]=(uint8_t)((x)>>8), (a)[1]=(uint8_t)(x) |
| 333 | #define htobe32a(a,x) (a)[0]=(uint8_t)((x)>>24), (a)[1]=(uint8_t)((x)>>16), \\ |
| 334 | (a)[2]=(uint8_t)((x)>>8), (a)[3]=(uint8_t)(x) |
| 335 | #define htobe64a(a,x) (a)[0]=(uint8_t)((x)>>56), (a)[1]=(uint8_t)((x)>>48), \\ |
| 336 | (a)[2]=(uint8_t)((x)>>40), (a)[3]=(uint8_t)((x)>>32), \\ |
| 337 | (a)[4]=(uint8_t)((x)>>24), (a)[5]=(uint8_t)((x)>>16), \\ |
| 338 | (a)[6]=(uint8_t)((x)>>8), (a)[7]=(uint8_t)(x) |
| 339 | #define htole16a(a,x) (a)[1]=(uint8_t)((x)>>8), (a)[0]=(uint8_t)(x) |
| 340 | #define htole32a(a,x) (a)[3]=(uint8_t)((x)>>24), (a)[2]=(uint8_t)((x)>>16), \\ |
| 341 | (a)[1]=(uint8_t)((x)>>8), (a)[0]=(uint8_t)(x) |
| 342 | #define htole64a(a,x) (a)[7]=(uint8_t)((x)>>56), (a)[6]=(uint8_t)((x)>>48), \\ |
| 343 | (a)[5]=(uint8_t)((x)>>40), (a)[4]=(uint8_t)((x)>>32), \\ |
| 344 | (a)[3]=(uint8_t)((x)>>24), (a)[2]=(uint8_t)((x)>>16), \\ |
| 345 | (a)[1]=(uint8_t)((x)>>8), (a)[0]=(uint8_t)(x) |
| 346 | |
| 347 | EOF |
| 348 | ;; |
| 349 | esac |
| 350 | ] |
| 351 | |
| 352 | cat >> "$1" << EOF |
| 353 | #endif /*__BYTEORDER_H*/ |
| 354 | EOF]) |