test iocsh functions

test/capturestd.cpp

@@ -0,0 +1,59 @@
+/**
+ * Copyright - See the COPYRIGHT that is included with this distribution.
+ * pvxs is distributed subject to a Software License Agreement found
+ * in file LICENSE that is included with this distribution.
+ */
+
+#include <fstream>
+#include <sstream>
+#include <stdexcept>
+#include <memory>
+
+#include "capturestd.h"
+
+#include <epicsUnitTest.h>
+#include <epicsStdio.h>
+
+static
+std::string readFile(const std::string& filename)
+{
+    std::ifstream t(filename.c_str());
+    std::stringstream buffer;
+
+    if (!t.is_open()) {
+        throw std::invalid_argument("Could not open filename " + filename);
+    }
+
+    buffer << t.rdbuf();
+    return buffer.str();
+}
+
+CaptureStd::CaptureStd(const std::function<void ()> &fn) {
+    std::shared_ptr<FILE>
+        out(fopen("testiocsh.out", "w+b"),
+            [](FILE* fp){
+                (void)fclose(fp);
+            }),
+        err(fopen("testiocsh.err", "w+b"),
+            [](FILE* fp){
+                (void)fclose(fp);
+            });
+
+    if(!out || !err)
+        testAbort("Unable to open/create testiocsh.out / .err");
+    epicsSetThreadStdout(out.get());
+    epicsSetThreadStderr(err.get());
+
+    try {
+        fn();
+    }catch(...){
+        epicsSetThreadStdout(nullptr);
+        epicsSetThreadStderr(nullptr);
+        throw;
+    }
+    out.reset();
+    err.reset();
+
+    m_out = readFile("testiocsh.out");
+    m_err = readFile("testiocsh.err");
+}