Replace with C (#2)

Author: keith

.clang-format

@@ -0,0 +1 @@
+BasedOnStyle: LLVM

.gitignore

@@ -1 +1,4 @@
+.cache
+/build
 /target
+compile_commands.json

CMakeLists.txt

@@ -0,0 +1,8 @@
+project(dyld-shared-cache-extractor LANGUAGES C)
+cmake_minimum_required(VERSION 3.21)
+
+set(CMAKE_EXPORT_COMPILE_COMMANDS 1)
+
+add_executable(dyld-shared-cache-extractor dyld-shared-cache-extractor.c)
+target_compile_options(dyld-shared-cache-extractor PRIVATE -g -Weverything)
+install(TARGETS dyld-shared-cache-extractor)

Cargo.lock

@@ -0,0 +1,75 @@
+#include <dlfcn.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#define PATH_SIZE 200
+
+static void (*extract)(const char *cache_path, const char *output_path,
+                       void (^progress)(int, int));
+
+static int get_library_path(char *output) {
+  FILE *pipe = popen("xcrun --sdk iphoneos --show-sdk-platform-path", "r");
+  if (!pipe)
+    return 1;
+
+  if (fgets(output, PATH_SIZE, pipe) == NULL)
+    return 1;
+
+  output[strlen(output) - 1] = '\0';
+  strcat(output, "/usr/lib/dsc_extractor.bundle");
+
+  return pclose(pipe);
+}
+
+__attribute__((noreturn))
+__attribute__((__format__(__printf__, 1, 0))) static void
+fail(const char *error, ...) {
+  va_list args;
+  va_start(args, error);
+  vfprintf(stderr, error, args);
+  va_end(args);
+  exit(EXIT_FAILURE);
+}
+
+static void extract_shared_cache(const char *library_path,
+                                 const char *cache_path,
+                                 const char *output_path) {
+  void *handle = dlopen(library_path, RTLD_LAZY);
+  if (!handle)
+    fail("error: failed to load bundle: %s\n", library_path);
+
+  *(void **)(&extract) =
+      dlsym(handle, "dyld_shared_cache_extract_dylibs_progress");
+
+  if (!extract)
+    fail("error: failed to load function from bundle: %s\n", library_path);
+
+  extract(cache_path, output_path, ^void(int completed, int total) {
+    printf("extracted %d/%d\n", completed, total);
+  });
+}
+
+int main(int argc, char *argv[]) {
+  if (argc != 3)
+    fail("Usage: %s <shared-cache-path> <output-path>\n", argv[0]);
+
+  const char *shared_cache = argv[1];
+  if (access(shared_cache, R_OK) != 0)
+    fail("error: shared cache path doesn't exist: %s\n", shared_cache);
+
+  char library_path[PATH_SIZE];
+  if (get_library_path(library_path) != 0)
+    fail("error: failed to fetch Xcode path\n");
+
+  if (access(library_path, R_OK) != 0)
+    fail("error: dsc_extractor.bundle wasn't found at expected path, Xcode "
+         "might have changed this location: %s\n",
+         library_path);
+
+  const char *output_path = argv[2];
+  extract_shared_cache(library_path, shared_cache, output_path);
+  return 0;
+}