Function subst_parser

re.c:217–340

! \brief Parse a /regular expression/replacement/flags into a subst_expr structure */

/*! \brief Parse a /regular expression/replacement/flags into a subst_expr structure
 */
struct subst_expr* subst_parser(str* subst)
{
	char c;
	char* end;
	char* p;
	char* re;
	char* re_end;
	char* repl;
	char* repl_end;
	struct replace_with rw[MAX_REPLACE_WITH];
	int rw_no;
	//int escape;
	int cflags; /* regcomp flags */
	int replace_all;
	struct subst_expr* se;
	regex_t* regex;
	int max_pmatch;
	int r;

	/* init */
	se=0;
	regex=0;
	cflags=REG_EXTENDED  | REG_NEWLINE; /* don't match newline */
	replace_all=0;
	if (subst->len<3){
		LM_ERR("expression is too short: %.*s\n", subst->len, subst->s);
		goto error;
	}

	p=subst->s;
	end=subst->s+subst->len;

	c=*p;
	if (c=='\\'){
		LM_ERR("invalid separator char <%c> in %.*s\n", c,
				subst->len, subst->s);
		goto error;
	}
	p++;

	/* find re */
	re=p;
	for (;p<end;p++){
		/* if unescaped sep. char */
		if ((*p==c) && (*(p-1)!='\\')) goto found_re;
	}
	LM_ERR("no separator found: %.*s\n", subst->len, subst->s);
	goto error;
found_re:
	re_end=p;
	if(end< (p+2) ){
		LM_ERR("string too short\n");
		goto error;
	}
	repl=p+1;
	if((rw_no = parse_repl(rw, &p, end, &max_pmatch, WITH_SEP))< 0)
		goto error;