diff options
Diffstat (limited to 'src/common/wchar.c')
| -rw-r--r-- | src/common/wchar.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/common/wchar.c b/src/common/wchar.c index 6e7d731e020..0636b8765ba 100644 --- a/src/common/wchar.c +++ b/src/common/wchar.c @@ -1911,6 +1911,11 @@ const pg_wchar_tbl pg_wchar_table[] = { /* * Returns the byte length of a multibyte character. + * + * Caution: when dealing with text that is not certainly valid in the + * specified encoding, the result may exceed the actual remaining + * string length. Callers that are not prepared to deal with that + * should use pg_encoding_mblen_bounded() instead. */ int pg_encoding_mblen(int encoding, const char *mbstr) @@ -1921,6 +1926,16 @@ pg_encoding_mblen(int encoding, const char *mbstr) } /* + * Returns the byte length of a multibyte character; but not more than + * the distance to end of string. + */ +int +pg_encoding_mblen_bounded(int encoding, const char *mbstr) +{ + return strnlen(mbstr, pg_encoding_mblen(encoding, mbstr)); +} + +/* * Returns the display length of a multibyte character. */ int |