Enhanced redirect sample

samples/redirect.c

@@ -2,14 +2,56 @@
 #include <criterion/redirect.h>
 
 #include <stdio.h>
+#include <ctype.h>
 
-Test(redirect, test_stdout) {
+// Testing stdout/stderr
+
+void redirect_all_std(void) {
     cr_redirect_stdout();
+    cr_redirect_stderr();
+}
+
+Test(redirect, test_outputs, .init = redirect_all_std) {
+    FILE* f_stdout = cr_get_redirected_stdout();
 
     fprintf(stdout, "foo");
     fflush(stdout);
 
-    FILE* stdout_in = cr_get_redirected_stdout();
+    cr_assert_file_contents_match_str(f_stdout, "foo");
 
-    cr_assert_file_contents_match_str(stdout_in, "foo");
+    FILE* f_stderr = cr_get_redirected_stderr();
+
+    fprintf(stderr, "bar");
+    fflush(stderr);
+
+    cr_assert_file_contents_match_str(f_stderr, "bar");
+}
+
+// Testing general I/O with sample command-line rot13
+
+char rot13_char(char c) {
+    return isalpha(c) ? (c - 'a' + 13) % 26 + 'a' : c;
+}
+
+void rot13_io(void) {
+    char buf[512];
+
+    size_t read;
+    while ((read = fread(buf, 1, sizeof (buf), stdin)) > 0) {
+        for (size_t i = 0; i < read; ++i)
+            buf[i] = rot13_char(buf[i]);
+        fwrite(buf, 1, read, stdout);
+    }
+    fflush(stdout);
+}
+
+Test(redirect, rot13, .init = cr_redirect_stdout) {
+    FILE* f_stdin = cr_get_redirected_stdin();
+    fprintf(f_stdin, "the quick brown fox jumps over the lazy dog");
+    fclose(f_stdin);
+
+    rot13_io();
+
+    FILE* f_stdout = cr_get_redirected_stdout();
+    cr_assert_file_contents_match_str(f_stdout, "gur dhvpx oebja sbk whzcf bire gur ynml qbt");
 }