diff options
Diffstat (limited to 'sql/item_cmpfunc.cc')
| -rw-r--r-- | sql/item_cmpfunc.cc | 65 |
1 files changed, 61 insertions, 4 deletions
diff --git a/sql/item_cmpfunc.cc b/sql/item_cmpfunc.cc index 1f1982ffb80..90eef1ea55c 100644 --- a/sql/item_cmpfunc.cc +++ b/sql/item_cmpfunc.cc @@ -5160,10 +5160,65 @@ bool Regexp_processor_pcre::compile(Item *item, bool send_error) } +/** + Send a warning explaining an error code returned by pcre_exec(). +*/ +void Regexp_processor_pcre::pcre_exec_warn(int rc) const +{ + char buf[64]; + const char *errmsg= NULL; + /* + Make a descriptive message only for those pcre_exec() error codes + that can actually happen in MariaDB. + */ + switch (rc) + { + case PCRE_ERROR_NOMEMORY: + errmsg= "pcre_exec: Out of memory"; + break; + case PCRE_ERROR_BADUTF8: + errmsg= "pcre_exec: Invalid utf8 byte sequence in the subject string"; + break; + case PCRE_ERROR_RECURSELOOP: + errmsg= "pcre_exec: Recursion loop detected"; + break; + default: + /* + As other error codes should normally not happen, + we just report the error code without textual description + of the code. + */ + my_snprintf(buf, sizeof(buf), "pcre_exec: Internal error (%d)", rc); + errmsg= buf; + } + push_warning_printf(current_thd, Sql_condition::WARN_LEVEL_WARN, + ER_REGEXP_ERROR, ER(ER_REGEXP_ERROR), errmsg); +} + + +/** + Call pcre_exec() and send a warning if pcre_exec() returned with an error. +*/ +int Regexp_processor_pcre::pcre_exec_with_warn(const pcre *code, + const pcre_extra *extra, + const char *subject, + int length, int startoffset, + int options, int *ovector, + int ovecsize) +{ + int rc= pcre_exec(code, extra, subject, length, + startoffset, options, ovector, ovecsize); + DBUG_EXECUTE_IF("pcre_exec_error_123", rc= -123;); + if (rc < PCRE_ERROR_NOMATCH) + pcre_exec_warn(rc); + return rc; +} + + bool Regexp_processor_pcre::exec(const char *str, int length, int offset) { - m_pcre_exec_rc= pcre_exec(m_pcre, NULL, str, length, - offset, 0, m_SubStrVec, m_subpatterns_needed * 3); + m_pcre_exec_rc= pcre_exec_with_warn(m_pcre, NULL, str, length, offset, 0, + m_SubStrVec, m_subpatterns_needed * 3); return false; } @@ -5173,8 +5228,10 @@ bool Regexp_processor_pcre::exec(String *str, int offset, { if (!(str= convert_if_needed(str, &subject_converter))) return true; - m_pcre_exec_rc= pcre_exec(m_pcre, NULL, str->c_ptr_safe(), str->length(), - offset, 0, m_SubStrVec, m_subpatterns_needed * 3); + m_pcre_exec_rc= pcre_exec_with_warn(m_pcre, NULL, + str->c_ptr_safe(), str->length(), + offset, 0, + m_SubStrVec, m_subpatterns_needed * 3); if (m_pcre_exec_rc > 0) { uint i; |