1 files changed, 35 insertions, 0 deletions
diff --git a/test cases/unit/77 nostdlib/subprojects/mylibc/libc.c b/test cases/unit/77 nostdlib/subprojects/mylibc/libc.c
new file mode 100644
index 0000000..67261cb
--- /dev/null
+++ b/test cases/unit/77 nostdlib/subprojects/mylibc/libc.c
@@ -0,0 +1,35 @@
+/* Do not use this as the basis of your own libc.
+ * The code is probably unoptimal or wonky, as I
+ * had no prior experience with this, but instead
+ * just fiddled with the code until it worked.
+ */
+
+#include<stdio.h>
+
+#define STDOUT 1
+#define SYS_WRITE 4
+
+int simple_print(const char *msg, const long bufsize) {
+  int count;
+  long total_written = 0;
+  while(total_written < bufsize) {
+    asm(
+        "int $0x80\n\t"
+        : "=a"(count)
+        : "0"(SYS_WRITE), "b"(STDOUT), "c"(msg+total_written), "d"(bufsize-total_written)
+        :);
+    if(count == 0) {
+      return 1;
+    }
+    total_written += count;
+  }
+  return 0;
+}
+
+int simple_strlen(const char *str) {
+  int len = 0;
+  while(str[len] != '\0') {
+    len++;
+  }
+  return len;
+}