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Rewrite strnlen replacement implementation from 8a241792f9.

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The previous placement of the fallback implementation in libpgcommon
was problematic, because libpqport functions need strnlen
functionality.

Move replacement into libpgport. Provide strnlen() under its posix
name, instead of pg_strnlen(). Fix stupid configure bug, executing the
test only when compiled with threading support.

Author: Andres Freund
Discussion: https://postgr.es/m/E1e1gR2-0005fB-SI@gemulon.postgresql.org
This commit is contained in:
Andres Freund
2017-10-10 14:42:16 -07:00
parent fa5e119dc7
commit fffd651e83
10 changed files with 77 additions and 47 deletions
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15
src/include/common/string.h
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@@ -12,19 +12,4 @@
extern bool pg_str_endswith(const char *str, const char *end);
/*
* Portable version of posix' strnlen.
*
* Returns the number of characters before a null-byte in the string pointed
* to by str, unless there's no null-byte before maxlen. In the latter case
* maxlen is returned.
*
* Use the system strnlen if provided, it's likely to be faster.
*/
#ifdef HAVE_STRNLEN
#define pg_strnlen(str, maxlen) strnlen(str, maxlen)
#else
extern size_t pg_strnlen(const char *str, size_t maxlen);
#endif
#endif /* COMMON_STRING_H */