init commit

tests/test_basic.c

@@ -0,0 +1,33 @@
+#include <assert.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <string.h>
+
+int main(void) {
+  /* memcpy */
+  char src[] = "hello world";
+  char dst[64];
+  memcpy(dst, src, 12);
+  dst[12] = 0;
+  assert(strcmp(dst, "hello world") == 0);
+
+  /* strlen */
+  assert(strlen("") == 0);
+  assert(strlen("abc") == 3);
+
+  /* memset */
+  char buf[10];
+  memset(buf, 0xAB, 10);
+  for (int i = 0; i < 10; i++) assert((unsigned char)buf[i] == 0xAB);
+
+  /* memcmp */
+  assert(memcmp("abc", "abc", 3) == 0);
+  assert(memcmp("abc", "abd", 3) < 0);
+
+  /* strcmp */
+  assert(strcmp("hello", "hello") == 0);
+  assert(strcmp("abc", "def") < 0);
+
+  printf("ALL STRING TESTS PASSED\n");
+  return 0;
+}

tests/test_string.c

@@ -0,0 +1,28 @@
+typedef unsigned long size_t;
+void *memcpy(void *restrict d, const void *restrict s, size_t n);
+void *memset(void *d, int c, size_t n);
+int   memcmp(const void *l, const void *r, size_t n);
+size_t strlen(const char *s);
+int   strcmp(const char *l, const char *r);
+
+void _start(void)
+{
+    int code = 0;
+    char src[] = "hello world", dst[64];
+    memcpy(dst, src, 12); dst[12] = 0;
+    if (strcmp(dst, "hello world") != 0) code = 1;
+    else if (strlen("") != 0) code = 2;
+    else if (strlen("abc") != 3) code = 3;
+    else {
+        char buf[10];
+        memset(buf, 0xAB, 10);
+        for (int i = 0; i < 10; i++)
+            if ((unsigned char)buf[i] != 0xAB) { code = 4; break; }
+    }
+    if (code == 0 && memcmp("abc", "abc", 3) != 0) code = 5;
+    if (code == 0 && memcmp("abc", "abd", 3) >= 0) code = 6;
+    if (code == 0 && strcmp("hello", "hello") != 0) code = 7;
+    if (code == 0 && strcmp("abc", "def") >= 0) code = 8;
+
+    __asm__ volatile ("mov $60, %%eax\n syscall" : : "D"(code) : "rax");
+}