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Kamailio compatibility: parse_repl

* Move the replace parser into a separate function called parse_repl
* Declare the function in the header file
* Add support for PV_MARKER (pseudo-variable marker $) to the parser

Jan Janak authored on 08/03/2009 03:16:08
Showing 2 changed files
re.c
History View file @ 6a320d25bf
... ... 
@@ -64,12 +64,143 @@ void replace_lst_free(struct replace_lst* l)
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 	}
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 }
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+int parse_repl(struct replace_with * rw, char ** begin,
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+				char * end, int *max_token_nb, int with_sep)
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+{
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+
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+	char* p0;
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+	char * repl;
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+	str s;
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+	int token_nb;
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+	int escape;
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+	int max_pmatch;
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+	char *p, c;
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+
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+	/* parse replacement */
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+	p = *begin;
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+	c = *p;
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+	if(with_sep)
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+		p++;
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+	repl= p;
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+	token_nb=0;
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+	max_pmatch=0;
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+	escape=0;
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+	for(;p<end; p++){
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+		if (escape){
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+			escape=0;
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+			switch (*p){
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+				/* special char escapes */
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+				case '\\':
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+					rw[token_nb].size=2;
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+					rw[token_nb].offset=(p-1)-repl;
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+					rw[token_nb].type=REPLACE_CHAR;
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+					rw[token_nb].u.c='\\';
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+					break;
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+				case 'n':
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+					rw[token_nb].size=2;
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+					rw[token_nb].offset=(p-1)-repl;
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+					rw[token_nb].type=REPLACE_CHAR;
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+					rw[token_nb].u.c='\n';
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+					break;
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+				case 'r':
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+					rw[token_nb].size=2;
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+					rw[token_nb].offset=(p-1)-repl;
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+					rw[token_nb].type=REPLACE_CHAR;
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+					rw[token_nb].u.c='\r';
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+					break;
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+				case 't':
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+					rw[token_nb].size=2;
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+					rw[token_nb].offset=(p-1)-repl;
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+					rw[token_nb].type=REPLACE_CHAR;
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+					rw[token_nb].u.c='\t';
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+					break;
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+				case PV_MARKER:
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+					rw[token_nb].size=2;
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+					rw[token_nb].offset=(p-1)-repl;
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+					rw[token_nb].type=REPLACE_CHAR;
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+					rw[token_nb].u.c=PV_MARKER;
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+					break;
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+				/* special sip msg parts escapes */
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+				case 'u':
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+					rw[token_nb].size=2;
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+					rw[token_nb].offset=(p-1)-repl;
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+					rw[token_nb].type=REPLACE_URI;
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+					break;
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+				/* re matches */
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+				case '0': /* allow 0, too, reference to the whole match */
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+				case '1':
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+				case '2':
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+				case '3':
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+				case '4':
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+				case '5':
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+				case '6':
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+				case '7':
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+				case '8':
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+				case '9':
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+					rw[token_nb].size=2;
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+					rw[token_nb].offset=(p-1)-repl;
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+					rw[token_nb].type=REPLACE_NMATCH;
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+					rw[token_nb].u.nmatch=(*p)-'0';
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+								/* 0 is the whole matched str*/
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+					if (max_pmatch<rw[token_nb].u.nmatch)
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+						max_pmatch=rw[token_nb].u.nmatch;
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+					break;
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+				default: /* just print current char */
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+					if (*p!=c){
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+						WARN("subst_parser:\\%c unknown escape in %s\n", *p, *begin);
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+					}
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+					rw[token_nb].size=2;
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+					rw[token_nb].offset=(p-1)-repl;
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+					rw[token_nb].type=REPLACE_CHAR;
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+					rw[token_nb].u.c=*p;
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+					break;
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+			}
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+
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+			token_nb++;
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+
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+			if (token_nb>=MAX_REPLACE_WITH){
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+				ERR("subst_parser: too many escapes in the replace part %s\n", *begin);
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+				goto error;
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+			}
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+		}else if (*p=='\\') {
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+			escape=1;
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+		}else if (*p==PV_MARKER) {
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+			s.s = p;
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+			s.len = end - s.s;
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+			p0 = pv_parse_spec(&s, &rw[token_nb].u.spec);
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+			if(p0==NULL)
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+			{
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+				ERR("subst_parser: bad specifier in replace part %s\n", *begin);
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+				goto error;
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+			}
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+			rw[token_nb].size=p0-p;
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+			rw[token_nb].offset=p-repl;
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+			rw[token_nb].type=REPLACE_SPEC;
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+			token_nb++;
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+			p=p0-1;
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+		}else  if (*p==c && with_sep){
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+				goto found_repl;
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+		}
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+	}
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+	if(with_sep){
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+		ERR("subst_parser: missing separator: %s\n", *begin);
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+		goto error;
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+	}
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+
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+found_repl:
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+
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+	*max_token_nb = max_pmatch;
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+	*begin = p;
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+	return token_nb;
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+
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+error:
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+	return -1;
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+}
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 /* parse a /regular expression/replacement/flags into a subst_expr structure */
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 struct subst_expr* subst_parser(str* subst)
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 {
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-#define MAX_REPLACE_WITH 100
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 	char c;
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 	char* end;
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 	char* p;
re.h
History View file @ 6a320d25bf
... ... 
@@ -79,6 +79,8 @@ struct replace_lst{
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 void subst_expr_free(struct subst_expr* se);
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 void replace_lst_free(struct replace_lst* l);
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+int parse_repl(struct replace_with * rw, char ** begin,
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+				char * end, int *max_token_nb, int flag);
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 struct subst_expr*  subst_parser(str* subst);
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 struct replace_lst* subst_run( struct subst_expr* se, const char* input,
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 		                       struct sip_msg* msg, int *count);