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1 files changed, 27 insertions, 0 deletions

diff --git a/tests/test_quine.c b/tests/test_quine.c
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+++ b/tests/test_quine.c
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+/* test_quine.c — a C quine: running it prints its own source.
+ *
+ * How it works: the file is a fixed point of a "quinate" function.
+ * The two strings below are that function's data; everything around
+ * them is code that re-emits the data verbatim, spliced back into the
+ * same program shape.  No argv, no /proc/self, no tricks — just two
+ * printf calls.
+ *
+ * Build:  musl-gcc -std=gnu11 -Oz -Wall -Wextra -o test_quine tests/test_quine.c
+ * Check:  ./test_quine | diff - tests/test_quine.c   (no output = quine) */
+
+#include <stdio.h>
+
+int main(void) {
+    const char *s =
+        "const char *s = \"%s\";\n"
+        "const char *f = \"%s\";\n"
+        "printf(f, s, s, f);\n"
+        "return 0;\n";
+    const char *f =
+        "int main(void) {\n"
+        "    %s    printf(f, s, s, f);\n"
+        "    return 0;\n"
+        "}\n";
+    printf(f, s, s, f);
+    return 0;
+}