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49 lines
1.2 KiB
Plaintext
49 lines
1.2 KiB
Plaintext
#serial 5
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dnl A replacement for autoconf's AC_FUNC_MEMCMP that detects
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dnl the losing memcmp on some x86 Next systems.
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AC_DEFUN(jm_AC_FUNC_MEMCMP,
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[AC_CACHE_CHECK([for working memcmp], jm_cv_func_memcmp_working,
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[AC_TRY_RUN(
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[int
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main ()
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{
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/* Some versions of memcmp are not 8-bit clean. */
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char c0 = 0x40, c1 = 0x80, c2 = 0x81;
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if (memcmp(&c0, &c2, 1) >= 0 || memcmp(&c1, &c2, 1) >= 0)
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exit (1);
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/* The Next x86 OpenStep bug shows up only when comparing 16 bytes
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or more and with at least one buffer not starting on a 4-byte boundary.
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William Lewis provided this test program. */
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{
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char foo[21];
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char bar[21];
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int i;
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for (i = 0; i < 4; i++)
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{
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char *a = foo + i;
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char *b = bar + i;
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strcpy (a, "--------01111111");
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strcpy (b, "--------10000000");
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if (memcmp (a, b, 16) >= 0)
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exit (1);
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}
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exit (0);
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}
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}],
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jm_cv_func_memcmp_working=yes,
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jm_cv_func_memcmp_working=no,
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jm_cv_func_memcmp_working=no)])
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test $jm_cv_func_memcmp_working = no \
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&& AC_LIBOBJ(memcmp)
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])
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AC_DEFUN(jm_FUNC_MEMCMP,
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[AC_REQUIRE([jm_AC_FUNC_MEMCMP])dnl
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if test $jm_cv_func_memcmp_working = no; then
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AC_DEFINE_UNQUOTED(memcmp, rpl_memcmp,
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[Define to rpl_memcmp if the replacement function should be used.])
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fi
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])
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