first commit

file.c

@@ -0,0 +1,114 @@
+#ifndef WL_AMALGAMATION
+#include "includes.h"
+#include "file.h"
+#endif
+
+int file_open(String path, File *handle, int *size)
+{
+    char zt[1<<10];
+    if (path.len >= COUNT(zt))
+        return -1;
+    memcpy(zt, path.ptr, path.len);
+    zt[path.len] = '\0';
+
+#ifdef _WIN32
+    *handle = CreateFileA(
+        zt,
+        GENERIC_READ,
+        FILE_SHARE_READ,
+        NULL,
+        OPEN_EXISTING,
+        FILE_ATTRIBUTE_NORMAL,
+        NULL
+    );
+    if (*handle == INVALID_HANDLE_VALUE) {
+        DWORD error = GetLastError();
+        if (error == ERROR_FILE_NOT_FOUND ||
+            error == ERROR_ACCESS_DENIED)
+            return 1;
+        return -1;
+    }
+    LARGE_INTEGER fileSize;
+    if (!GetFileSizeEx(*handle, &fileSize)) {
+        CloseHandle(*handle);
+        return -1;
+    }
+    if (fileSize.QuadPart > INT_MAX) {
+        CloseHandle(*handle);
+        return -1;
+    }
+    *size = (int) fileSize.QuadPart;
+#else
+    *handle = open(zt, O_RDONLY);
+    if (*handle < 0) {
+        if (errno == ENOENT)
+            return 1;
+        return -1;
+    }
+    struct stat info;
+    if (fstat(*handle, &info) < 0) {
+        close(*handle);
+        return -1;
+    }
+    if (S_ISDIR(info.st_mode)) {
+        close(*handle);
+        return 1;
+    }
+    if (info.st_size > INT_MAX) {
+        close(*handle);
+        return -1;
+    }
+    *size = (int) info.st_size;
+#endif
+    return 0;
+}
+
+void file_close(File file)
+{
+#ifdef _WIN32
+	CloseHandle(file);
+#else
+	close(file);
+#endif
+}
+
+int file_read(File file, char *dst, int max)
+{
+#ifdef _WIN32
+    DWORD num;
+    BOOL ok = ReadFile(file, dst, max, &num, NULL);
+    if (!ok)
+        return -1;
+    return (int) num;
+#else
+    return read(file, dst, max);
+#endif
+}
+
+int file_read_all(String path, String *dst)
+{
+    int len;
+    File handle;
+    if (file_open(path, &handle, &len) < 0)
+        return -1;
+
+    char *ptr = malloc(len+1);
+    if (ptr == NULL) {
+        file_close(handle);
+        return -1;
+    }
+
+    for (int copied = 0; copied < len; ) {
+        int ret = file_read(handle, ptr + copied, len - copied);
+        if (ret <= 0) {
+            free(ptr);
+            file_close(handle);
+            return -1;
+        }
+        copied += ret;
+    }
+
+    *dst = (String) { ptr, len };
+    file_close(handle);
+    return 0;
+}