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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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20
src/common/string.c
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@@ -41,23 +41,3 @@ pg_str_endswith(const char *str, const char *end)
str += slen - elen;
return strcmp(str, end) == 0;
}
/*
* 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.
*/
#ifndef HAVE_STRNLEN
size_t
pg_strnlen(const char *str, size_t maxlen)
{
const char *p = str;
while (maxlen-- > 0 && *p)
p++;
return p - str;
}
#endif