Extract util function to build a local file path

Finding a local file in the scrcpy directory may be useful for files
other than scrcpy-server in the future.

app/src/command.c

@@ -1,6 +1,7 @@
 #include "command.h"
 
 #include <assert.h>
+#include <libgen.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -229,3 +230,31 @@ process_check_success(process_t proc, const char *name) {
     }
     return true;
 }
+
+char *
+get_local_file_path(const char *name) {
+    char *executable_path = get_executable_path();
+    if (!executable_path) {
+        return NULL;
+    }
+
+    char *dir = dirname(executable_path);
+    size_t dirlen = strlen(dir);
+    size_t namelen = strlen(name);
+
+    size_t len = dirlen + namelen + 2; // +2: '/' and '\0`
+    char *file_path = SDL_malloc(len);
+    if (!file_path) {
+        LOGE("Could not alloc path");
+        SDL_free(executable_path);
+    }
+
+    memcpy(file_path, dir, dirlen);
+    file_path[dirlen] = PATH_SEPARATOR;
+    // namelen + 1 to copy the final '\0'
+    memcpy(&file_path[dirlen + 1], name, namelen + 1);
+
+    SDL_free(executable_path);
+
+    return file_path;
+}

app/src/command.h

@@ -90,4 +90,9 @@ get_executable_path(void);
 bool
 is_regular_file(const char *path);
 
+// return the absolute path of a file in the same directory as the executable
+// may be NULL on error; to be freed by SDL_free
+char *
+get_local_file_path(const char *name);
+
 #endif

app/src/server.c

@@ -3,7 +3,6 @@
 #include <assert.h>
 #include <errno.h>
 #include <inttypes.h>
-#include <libgen.h>
 #include <stdio.h>
 #include <SDL2/SDL_thread.h>
 #include <SDL2/SDL_timer.h>
@@ -53,35 +52,13 @@ get_server_path(void) {
     // the absolute path is hardcoded
     return server_path;
 #else
-
-    // use scrcpy-server in the same directory as the executable
-    char *executable_path = get_executable_path();
-    if (!executable_path) {
-        LOGE("Could not get executable path, "
-             "using " SERVER_FILENAME " from current directory");
-        // not found, use current directory
-        return SERVER_FILENAME;
-    }
-    char *dir = dirname(executable_path);
-    size_t dirlen = strlen(dir);
-
-    // sizeof(SERVER_FILENAME) gives statically the size including the null byte
-    size_t len = dirlen + 1 + sizeof(SERVER_FILENAME);
-    char *server_path = SDL_malloc(len);
+    char *server_path = get_local_file_path(SERVER_FILENAME);
     if (!server_path) {
-        LOGE("Could not alloc server path string, "
+        LOGE("Could not get local file path, "
              "using " SERVER_FILENAME " from current directory");
-        SDL_free(executable_path);
         return SERVER_FILENAME;
     }
 
-    memcpy(server_path, dir, dirlen);
-    server_path[dirlen] = PATH_SEPARATOR;
-    memcpy(&server_path[dirlen + 1], SERVER_FILENAME, sizeof(SERVER_FILENAME));
-    // the final null byte has been copied with SERVER_FILENAME
-
-    SDL_free(executable_path);
-
     LOGD("Using server (portable): %s", server_path);
     return server_path;
 #endif