explicitly cast -1 to size_t, support static_assert on pre-c11

app/src/cli.c

@@ -10,6 +10,10 @@
 #include "util/log.h"
 #include "util/str_util.h"
 
+#ifndef static_assert
+    #define static_assert(x, msg) (void) sizeof(struct {int a[(x) ? 1 : -1]})
+#endif
+
 void
 scrcpy_print_usage(const char *arg0) {
     fprintf(stderr,

app/src/receiver.c

@@ -47,7 +47,7 @@ process_msgs(const unsigned char *buf, size_t len) {
     for (;;) {
         struct device_msg msg;
         size_t r = device_msg_deserialize(&buf[head], len - head, &msg);
-        if (r == -1) {
+        if (r == (size_t)-1) {
             return -1;
         }
         if (r == 0) {
@@ -76,14 +76,14 @@ run_receiver(void *data) {
         assert(head < DEVICE_MSG_MAX_SIZE);
         size_t r = net_recv(receiver->control_socket, buf + head,
                              DEVICE_MSG_MAX_SIZE - head);
-        if (!r || r == -1) {
+        if (!r || r == (size_t)-1) {
             LOGD("Receiver stopped");
             break;
         }
 
         head += r;
         size_t consumed = process_msgs(buf, head);
-        if (consumed == -1) {
+        if (consumed == (size_t)-1) {
             // an error occurred
             break;
         }

app/src/stream.c

@@ -51,7 +51,7 @@ stream_recv_packet(struct stream *stream, AVPacket *packet) {
     }
 
     r = net_recv_all(stream->socket, packet->data, len);
-    if (r == -1 || ((uint32_t) r) < len) {
+    if (r == (size_t)-1 || ((uint32_t) r) < len) {
         av_packet_unref(packet);
         return false;
     }

app/src/sys/unix/command.c

@@ -156,7 +156,7 @@ get_executable_path(void) {
 #ifdef __linux__
     char buf[PATH_MAX + 1]; // +1 for the null byte
     size_t len = readlink("/proc/self/exe", buf, PATH_MAX);
-    if (len == -1) {
+    if (len == (size_t)-1) {
         perror("readlink");
         return NULL;
     }

app/src/util/net.c

@@ -103,7 +103,7 @@ net_send_all(socket_t socket, const void *buf, size_t len) {
     size_t w = 0;
     while (len > 0) {
         w = send(socket, buf, len, 0);
-        if (w == -1) {
+        if (w == (size_t)-1) {
             return -1;
         }
         len -= w;