dinit-iostream & dinit-fstream: Custom new special-purpose libraries

These are replacement for C++ standard library iostream/fstream.

See dinit-iostream.h and dinit-fstream.h for more information and the usage.

Signed-off-by: Mobin "Hojjat" Aydinfar <[email protected]>
Reviewed-by: Davin McCall <EMAIL HIDDEN>

src/dinit-fstream.cc

@@ -0,0 +1,171 @@
+#include <cstring>
+
+#include <dinit-fstream.h>
+
+// See dinit-fstream.h for inforamtion about the usage
+
+namespace dio {
+
+// class fstream_base
+int fstream_base::open(const char *path, const int flags) noexcept
+{
+    if (path == nullptr || path[0] == '\0') {
+        errno = EINVAL;
+        return -1; // Path is empty
+    }
+    int fd = bp_sys::open(path, flags);
+    if (fd < 0) return -1; // Failed
+    are_we_open = true;
+    return fd;
+}
+
+int fstream_base::open(const char *path, const int flags, const mode_t mode) noexcept
+{
+    if (path == nullptr || path[0] == '\0') {
+        errno = EINVAL;
+        return -1; // Path is empty
+    }
+    int fd = bp_sys::open(path, flags, mode);
+    if (fd < 0) return -1; // Failed
+    are_we_open = true;
+    return fd;
+}
+
+bool fstream_base::is_open() noexcept
+{
+    return are_we_open;
+}
+
+int fstream_base::close(const int fd) noexcept
+{
+    if (!is_open()) return -1;
+
+    int r = bp_sys::close(fd);
+    if (r < 0) return fd; // Failed
+    are_we_open = false;
+    return -1; // -1 means successful
+}
+
+// class ofstream
+bool ofstream::open() noexcept
+{
+    setfd(fstream_base::open(path, O_WRONLY));
+    return (getfd() >= 0);
+}
+
+bool ofstream::open(const int flags) noexcept
+{
+    setfd(fstream_base::open(path, O_WRONLY | flags));
+    return (getfd() >= 0);
+}
+
+bool ofstream::open(const int flags, const mode_t mode) noexcept
+{
+    setfd(fstream_base::open(path, O_WRONLY | flags, mode));
+    return (getfd() >= 0);
+}
+
+bool ofstream::open(const char *dpath) noexcept
+{
+    path = dpath;
+    open();
+    return (getfd() >= 0);
+}
+
+bool ofstream::open(const char *dpath, const int flags) noexcept
+{
+    path = dpath;
+    open(flags);
+    return (getfd() >= 0);
+}
+
+bool ofstream::open(const char *dpath, const int flags, const mode_t mode) noexcept
+{
+    path = dpath;
+    open(flags, mode);
+    return (getfd() >= 0);
+}
+
+bool ofstream::close() noexcept
+{
+    if (is_open()) setfd(fstream_base::close(getfd()));
+    return (getfd() < 0);
+}
+
+bool ofstream::operator!() noexcept
+{
+    return !is_open();
+}
+
+ofstream::operator bool() noexcept
+{
+    return is_open();
+}
+
+ofstream::~ofstream() noexcept
+{
+    close();
+}
+
+// class ifstream
+bool ifstream::open() noexcept
+{
+    setfd(fstream_base::open(path, O_RDONLY));
+    return (getfd() >= 0);
+}
+
+bool ifstream::open(const int flags) noexcept
+{
+    setfd(fstream_base::open(path, O_RDONLY | flags));
+    return (getfd() >= 0);
+}
+
+bool ifstream::open(const int flags, const mode_t mode) noexcept
+{
+    setfd(fstream_base::open(path, O_RDONLY | flags, mode));
+    return (getfd() >= 0);
+}
+
+bool ifstream::open(const char *dpath) noexcept
+{
+    path = dpath;
+    open();
+    return (getfd() >= 0);
+}
+
+bool ifstream::open(const char *dpath, const int flags) noexcept
+{
+    path = dpath;
+    open(flags);
+    return (getfd() >= 0);
+}
+
+bool ifstream::open(const char *dpath, const int flags, const mode_t mode) noexcept
+{
+    path = dpath;
+    open(flags, mode);
+    return (getfd() >= 0);
+}
+
+bool ifstream::close() noexcept
+{
+    if (is_open()) setfd(fstream_base::close(getfd()));
+    return (getfd() < 0);
+}
+
+bool ifstream::operator!() noexcept
+{
+    return !is_open();
+}
+
+ifstream::operator bool() noexcept
+{
+    return is_open();
+}
+
+ifstream::~ifstream() noexcept
+{
+    close();
+}
+
+} /* dio namespace */