added helper functions for URI handling

Makefile

@@ -1,9 +1,9 @@
-PROGRAM:=coap
+PROGRAM:=coap-server
 VERSION:=0.03
 
-SOURCES:= pdu.c net.c encode.c
+SOURCES:= pdu.c net.c encode.c uri.c
 OBJECTS:= $(patsubst %.c, %.o, $(SOURCES))
-HEADERS:=coap.h debug.h pdu.h net.h encode.h
+HEADERS:=coap.h debug.h pdu.h net.h encode.h uri.h
 CFLAGS:=-g -Wall -ansi -pedantic
 DISTDIR=$(PROGRAM)-$(VERSION)
 FILES:=main.c Makefile $(SOURCES) $(HEADERS) 

coap.h

@@ -10,5 +10,6 @@
 #include "pdu.h"
 #include "net.h"
 #include "encode.h"
+#include "uri.h"
 
 #endif /* _COAP_H_ */

uri.c

@@ -0,0 +1,90 @@
+/* uri.c -- helper functions for URI treatment
+ *
+ * (c) 2010 Olaf Bergmann <bergmann@tzi.org>
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+
+#include "uri.h"
+
+int
+coap_split_uri( char *str, coap_uri_t *uri) {
+  char *p;
+
+  if ( !str || !uri )
+    return -1;
+
+  memset( uri, 0, sizeof(coap_uri_t) );
+
+  /* find scheme */
+  p = str;
+  while ( isalnum(*p) )
+    ++p;
+
+  if ( *p != ':' ) {		/* no scheme, reset p */
+    p = str;
+  } else {			/* scheme found, look for network authority */
+    *p++ = '\0';
+    uri->scheme = str;
+    if ( strncmp( p, "//", 2 ) == 0 ) { /* have network authority */
+      p += 2;
+      uri->na = p;
+
+      /* skip NA and port so that p and str finally point to path */
+      while ( *p && *p != '/' ) 
+	++p;
+      
+      if ( *p )
+	*p++ = '\0';
+
+      str = p;
+#if 0
+      /* split server address and port */
+      if ( *uri->na == '[' ) {	/* IPv6 address reference */
+	p = ++uri->na;
+
+	while ( *p && *p != ']' ) 
+	  ++p;
+	*p++ = '\0';
+      } else {			/* IPv4 address or hostname */
+	p = uri->na;
+	while ( *p && *p != ':' ) 
+	  ++p;
+      }
+    
+      if ( *p == ':' ) {	/* handle port */
+	*p++ = '\0';
+	uri->port = p;
+      }
+#endif
+    } else 
+      str = p;			
+
+    /* str now points to the path */
+  }
+
+  /* split path and query */
+  if ( *str == '\0' )
+    return 0;
+
+#if 1
+    uri->path = str;
+#else
+  if (*str != '?')
+    uri->path = str++;
+
+  while (*str && *str != '?')
+    str++;
+
+  if (*str == '?') {
+    *str++ = '\0';
+
+    if (*str)			/* we do not want to point query to an empty string */
+      uri->query = str;
+  }
+#endif
+
+  return 0;
+}

uri.h

@@ -0,0 +1,22 @@
+/* uri.h -- helper functions for URI treatment
+ *
+ * (c) 2010 Olaf Bergmann <bergmann@tzi.org>
+ */
+
+#ifndef _COAP_URI_H_
+#define _COAP_URI_H_
+
+typedef struct {
+  char *scheme;	/* URI scheme */
+  char *na;	/* network authority */
+  char *path;  	/* path */
+} coap_uri_t;
+
+/**
+ * Splits given URI into pieces and fills the specified uri object accordingly.
+ * URI parts that are not available will be set to NULL in uri. The function 
+ * returns -1 on error, 0 on success. Note that the passed str will be altered.
+ */
+int coap_split_uri( char *str, coap_uri_t *uri);
+
+#endif /* _COAP_URI_H_ */