Add classes for reading and writing files

1 files changed, 79 insertions, 0 deletions

diff --git a/src/io/write_test.cpp b/src/io/write_test.cpp
new file mode 100644
index 0000000..36ab556
--- /dev/null
+++ b/src/io/write_test.cpp
@@ -0,0 +1,79 @@
+#include "write.hpp"
+
+#include <gtest/gtest.h>
+
+#include <fcntl.h>
+#include <unistd.h>
+
+#include "../strings/fstring.hpp"
+#include "../strings/mstring.hpp"
+#include "../strings/xstring.hpp"
+
+static
+int pipew(int& rfd)
+{
+    int pfd[2];
+    pipe2(pfd, O_NONBLOCK);
+    rfd = pfd[0];
+    return pfd[1];
+}
+
+class PipeWriter
+{
+private:
+    int rfd;
+public:
+    io::WriteFile wf;
+public:
+    PipeWriter(bool lb)
+    : wf(pipew(rfd), lb)
+    {}
+    ~PipeWriter()
+    {
+        close(rfd);
+    }
+    FString slurp()
+    {
+        MString tmp;
+        char buf[4096];
+        while (true)
+        {
+            ssize_t rv = read(rfd, buf, sizeof(buf));
+            if (rv == -1)
+            {
+                if (errno != EAGAIN)
+                    return {"Error, read failed :("};
+                rv = 0;
+            }
+            if (rv == 0)
+                break;
+            tmp += XString(buf + 0, buf + rv, nullptr);
+        }
+        return FString(tmp);
+    }
+};
+
+TEST(io, write1)
+{
+    PipeWriter pw(false);
+    io::WriteFile& wf = pw.wf;
+    wf.really_put("Hello, ", 7);
+    EXPECT_EQ("", pw.slurp());
+    wf.put_line("World!\n");
+    EXPECT_EQ("", pw.slurp());
+    EXPECT_TRUE(wf.close());
+    EXPECT_EQ("Hello, World!\n", pw.slurp());
+}
+
+TEST(io, write2)
+{
+    PipeWriter pw(true);
+    io::WriteFile& wf = pw.wf;
+    wf.really_put("Hello, ", 7);
+    EXPECT_EQ("", std::string(pw.slurp().c_str()));
+    wf.put_line("World!");
+    wf.really_put("XXX", 3);
+    EXPECT_EQ("Hello, World!\n", std::string(pw.slurp().c_str()));
+    EXPECT_TRUE(wf.close());
+    EXPECT_EQ("XXX", std::string(pw.slurp().c_str()));
+}