Fix PCRE compilation

Author: twose

ext/pcre/php_pcre.c

@@ -555,12 +555,12 @@ static zend_string **make_subpats_table(uint32_t num_subpats, pcre_cache_entry *
 
 /* {{{ static calculate_unit_length */
 /* Calculates the byte length of the next character. Assumes valid UTF-8 for PCRE2_UTF. */
-static zend_always_inline size_t calculate_unit_length(pcre_cache_entry *pce, char *start)
+static zend_always_inline size_t calculate_unit_length(pcre_cache_entry *pce, const char *start)
 {
 	size_t unit_len;
 
 	if (pce->compile_options & PCRE2_UTF) {
-		char *end = start;
+		cpnst char *end = start;
 
 		/* skip continuation bytes */
 		while ((*++end & 0xC0) == 0x80);
@@ -1570,7 +1570,7 @@ static zend_string *preg_do_repl_func(zend_fcall_info *fci, zend_fcall_info_cach
  */
 PHPAPI zend_string *php_pcre_replace(zend_string *regex,
 							  zend_string *subject_str,
-							  char *subject, size_t subject_len,
+							  const char *subject, size_t subject_len,
 							  zend_string *replace_str,
 							  size_t limit, size_t *replace_count)
 {
@@ -1610,10 +1610,10 @@ PHPAPI zend_string *php_pcre_replace_impl(pcre_cache_entry *pce, zend_string *su
 	size_t			 last_end_offset;	/* Where the last search ended */
 	char			*walkbuf,			/* Location of current replacement in the result */
 					*walk,				/* Used to walk the replacement string */
-					*match,				/* The current match */
-					*piece,				/* The current piece of subject */
-					*replace_end,		/* End of replacement string */
 					 walk_last;			/* Last walked character */
+	const char		*match,				/* The current match */
+					*piece,				/* The current piece of subject */
+					*replace_end;		/* End of replacement string */
 	size_t			result_len; 		/* Length of result */
 	zend_string		*result;			/* Result of replacement */
 	pcre2_match_data *match_data;
@@ -1849,7 +1849,7 @@ static zend_string *php_pcre_replace_func_impl(pcre_cache_entry *pce, zend_strin
 	size_t			 alloc_len;			/* Actual allocated length */
 	PCRE2_SIZE		 start_offset;		/* Where the new search starts */
 	size_t			 last_end_offset;	/* Where the last search ended */
-	char			*match,				/* The current match */
+	const char		*match,				/* The current match */
 					*piece;				/* The current piece of subject */
 	size_t			result_len; 		/* Length of result */
 	zend_string		*result;			/* Result of replacement */