Pass buffers as const.

[utcp] / utcp.c

diff --git a/utcp.c b/utcp.c
index 91aee3ce090f257e2d562b520e3ae59239012f33..d9ba952e2290466331d2346b556560577ac5f18d 100644 (file)
--- a/utcp.c
+++ b/utcp.c
@@ -134,7 +134,7 @@ static void set_state(struct utcp_connection *c, enum state state) {
        fprintf(stderr, "%p new state: %s\n", c->utcp, strstate[state]);
 }
 
-static void print_packet(void *pkt, size_t len) {
+static void print_packet(const void *pkt, size_t len) {
        struct hdr hdr;
        if(len < sizeof hdr) {
                fprintf(stderr, "short packet (%zu bytes)\n", len);
@@ -155,7 +155,7 @@ static void print_packet(void *pkt, size_t len) {
        if(len > sizeof hdr) {
                fprintf(stderr, " data=");
                for(int i = sizeof hdr; i < len; i++) {
-                       char *data = pkt;
+                       const char *data = pkt;
                        fprintf(stderr, "%c", data[i] >= 32 ? data[i] : '.');
                }
        }
@@ -306,7 +306,7 @@ void utcp_accept(struct utcp_connection *c, utcp_recv_t recv, void *priv) {
        set_state(c, ESTABLISHED);
 }
 
-ssize_t utcp_send(struct utcp_connection *c, void *data, size_t len) {
+ssize_t utcp_send(struct utcp_connection *c, const void *data, size_t len) {
        if(c->reapable) {
                fprintf(stderr, "Error: send() called on closed connection %p\n", c);
                errno = EBADF;
@@ -393,7 +393,7 @@ static int16_t seqdiff(uint16_t a, uint16_t b) {
        return a -b;
 }
 
-int utcp_recv(struct utcp *utcp, void *data, size_t len) {
+int utcp_recv(struct utcp *utcp, const void *data, size_t len) {
        if(!utcp) {
                errno = EFAULT;
                return -1;