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platform/file_access.cpp

@@ -0,0 +1,64 @@
+#include "platform.h"
+#include <filesystem>
+
+
+std::filesystem::path break_and_compose_path(const std::string_view &pathname, char sep) {
+    auto p = pathname.rfind(sep);
+    if (p == pathname.npos) {
+        if (pathname == "." || pathname == "..") return std::filesystem::canonical(".");
+        else if (pathname.empty()) return std::filesystem::current_path().root_path();
+        else if (pathname == std::filesystem::current_path().root_name())
+            return pathname;
+        else return std::filesystem::current_path()/pathname;
+
+    }
+    return break_and_compose_path(pathname.substr(0,p), sep) / pathname.substr(p+1);
+}
+
+
+std::filesystem::path convert_pathname_to_path(const std::string_view &pathname) {
+    auto p = pathname.find('\\');
+    if (p == pathname.npos) {
+        p = pathname.find('/');
+        if (p == pathname.npos) {
+            return std::filesystem::current_path()/pathname;
+        }
+        return break_and_compose_path(pathname, '/');
+    }
+    return break_and_compose_path(pathname, '\\');
+}
+
+std::filesystem::path try_to_find_file(const std::filesystem::path &p) {
+    if (!std::filesystem::exists(p)) {
+        std::filesystem::path parent;
+        if (p.has_relative_path()) {
+            parent = try_to_find_file(p.parent_path());
+        }
+        if (std::filesystem::exists(parent)) {
+            auto iter = std::filesystem::directory_iterator(parent);
+            auto end = std::filesystem::directory_iterator();
+            std::filesystem::path n = p.filename();
+            while (iter != end) {
+                const std::filesystem::directory_entry &e = *iter;
+                auto fn = e.path().filename();
+                if (stricmp(n.c_str(), fn.c_str()) == 0) {
+                    return e.path();
+                }
+                ++iter;
+            }
+        }
+        return p;
+    }
+    else return p;
+}
+
+
+char check_file_exists(const char *pathname) {
+    std::filesystem::path path = try_to_find_file(convert_pathname_to_path(pathname));
+    return std::filesystem::exists(path)?1:0;
+
+}
+FILE *fopen_icase(const char *pathname, const char *mode) {
+    std::filesystem::path path = try_to_find_file(convert_pathname_to_path(pathname));
+    return fopen(path.c_str(), mode);
+}