more tests

test/io/echo.c

@@ -0,0 +1,7 @@
+int getchar();
+int putchar(int ch);
+
+int main() {
+    for (char ch; (ch = getchar()) != -1; putchar(ch));
+    putchar('\n');
+}

test/io/echo.in

@@ -0,0 +1 @@
+hello world

test/io/echo.out

@@ -0,0 +1,2 @@
+hello world
+0

test/io/escape.c

@@ -0,0 +1,35 @@
+int offset = 0;
+
+int get() {
+    return "hello\\n\\tworld\\\\\\'\\\"\\0\r\t\0"[offset++];
+}
+
+int putchar(int ch);
+
+int main() {
+    char ch;
+    while ((ch = get()) != 0) {
+        if (ch == '\\') {
+            ch = get();
+            if (ch == 'n') {
+                ch = '\n';
+            } else if (ch == 't') {
+                ch = '\t';
+            } else if (ch == 'r') {
+                ch = '\r';
+            } else if (ch == '0') {
+                break;
+            } else if (ch == '\\') {
+                ch = '\\';
+            } else if (ch == '\'') {
+                ch = '\'';
+            } else if (ch == '\"') {
+                ch = '\"';
+            } else {
+                break;
+            }
+        }
+        putchar(ch);
+    }
+    return 0;
+}

test/io/escape.out

@@ -0,0 +1,2 @@
+hello
+	world\'"0

test/io/extern.c

@@ -0,0 +1,16 @@
+int fprintf(void* stream, char* format, ...);
+int fscanf(void* stream, char* format, ...);
+int sprintf(char* str, char* format, ...);
+
+extern void* stdin;
+extern void* stdout;
+
+int main() {
+    char buffer[4096];
+    int a;
+    int b;
+    fscanf(stdin, "%d %d", &a, &b);
+    sprintf(buffer, "The sum of %d and %d is %d\n", a, b, a + b);
+    fprintf(stdout, buffer);
+    return 0;
+}

test/io/extern.in

@@ -0,0 +1 @@
+3 4

test/io/extern.out

@@ -0,0 +1,2 @@
+The sum of 3 and 4 is 7
+0