diff --git a/libc/include/stdio.h b/libc/include/stdio.h
index 4a296f1..e2e1b28 100644
--- a/libc/include/stdio.h
+++ b/libc/include/stdio.h
@@ -70,8 +70,8 @@ int vfprintf(FILE* stream, const char* fmt, va_list va);
 // NOTE: (v)sprinf() Has been depricated and removed as it is unsafe (potencial buffer overflow). Please use (v)snprintf()
 int snprintf(char* str, size_t size, const char* fmt, ...);
 int vsnprintf(char* str, size_t size, const char* fmt, va_list va);
-int vpprintf(void (*outfn)(char c, void* arg), void* arg, const char* fmt, ...)
-int vpprintf(void (*outfn)(char c, void* arg), void* arg, const char* fmt, va_list va)
+int pprintf(void (*outfn)(char c, void* arg), void* arg, const char* fmt, ...);
+int vpprintf(void (*outfn)(char c, void* arg), void* arg, const char* fmt, va_list va);
 
 int scanf(const char* fmt, ...);
 int vscanf(const char* fmt, va_list va);
diff --git a/libc/include/syscall.h b/libc/include/syscall.h
index f3a849e..f8cff87 100644
--- a/libc/include/syscall.h
+++ b/libc/include/syscall.h
@@ -30,7 +30,6 @@ inline int syscall(int nr, int a0, int a1, int a2, int a3, int a4) {
         "movl %%eax, %0"    // Return
         : "=r"(ret)         // Output
         : "r"(nr), "r"(a0), "r"(a1), "r"(a2), "r"(a3), "r"(a4)  // Input
-        : "eax", "ebx", "ecx", "edx", "esi", "edi"  // Clobbered regs
     );
     return ret;
 }
@@ -39,9 +38,9 @@ inline int syscall(int nr, int a0, int a1, int a2, int a3, int a4) {
 inline int _exit(int status) { return syscall(SYS_EXIT, status, 0, 0, 0, 0); }
 inline int read(int fd, void* ptr, size_t count) { return syscall(SYS_READ, fd, (int)ptr, (int)count, 0, 0); }
 inline int write(int fd, const void* ptr, size_t count) { return syscall(SYS_WRITE, fd, (int)ptr, (int)count, 0, 0); }
-inline int open(const char* path, int oflag) { return syscall(SYS_OPEN, (int)path, oflag, 0, 0); }
-inline int close(int fd) { return syscall(SYS_CLOSE, fd, 0, 0, 0, 0); }
-inline int seek(int fd, size_t offset, int whence) { return syscall(SYS_SEEK, fd, offset, whence); }
+inline int open(const char* path, int oflag) { return syscall(SYS_OPEN, (int)path, oflag, 0, 0, 0); }
+inline int close(int fd) { return syscall(SYS_CLOSE, fd, 0, 0, 0, 0); }
+inline int seek(int fd, size_t offset, int whence) { return syscall(SYS_SEEK, fd, offset, whence, 0, 0); }
 inline int _malloc(int size) { return syscall(SYS_MALLOC, size, 0, 0, 0, 0); }
 inline int _free(void* ptr) { return syscall(SYS_FREE, (int)ptr, 0, 0, 0, 0); }
 inline int _sleep(int t) { return syscall(SYS_SLEEP, t, 0, 0, 0, 0); }
diff --git a/libc/stdio/char.c b/libc/stdio/char.c
index 0cff5ff..170cb53 100644
--- a/libc/stdio/char.c
+++ b/libc/stdio/char.c
@@ -2,14 +2,14 @@
 #include <syscall.h>
 
 int getchar(void) { return getc(stdin); }
-int putchar(int c) { return putc(stdout); }
+int putchar(int c) { return putc(c, stdout); }
 
 int getc(FILE* stream) {
     if (!stream) { return EOF; }
 
     unsigned char ch;
     ssize_t res = read(stream->_file, &ch, 1);
-    if (res <= 0) { return EOF; }
+    if (res <= 0) { return EOF; }
 
     return (int)ch;
 }
@@ -19,7 +19,7 @@ int putc(int c, FILE* stream) {
 
     unsigned char ch = (unsigned char)c;
     ssize_t res = write(stream->_file, &c, 1);
-    if (res <= 0) { return EOF; }
+    if (res <= 0) { return EOF; }
 
     return (int)ch;
 }
diff --git a/libc/stdio/file.c b/libc/stdio/file.c
index 711a5eb..1621c94 100644
--- a/libc/stdio/file.c
+++ b/libc/stdio/file.c
@@ -2,6 +2,7 @@
 #include <syscall.h>
 #include <stdlib.h>
 #include <string.h>
+#include <fcntl.h>
 
 FILE* fopen(const char* path, const char* mode) {
     FILE* fp = (FILE*)malloc(sizeof(FILE));
@@ -15,13 +16,13 @@ FILE* fopen(const char* path, const char* mode) {
     else if (strcmp(mode, "w+") == 0) { flags = O_RDWR | O_CREAT | O_TRUNC; }
     else if (strcmp(mode, "a+") == 0) { flags = O_RDWR | O_CREAT | O_APPEND; }
     else {  // Unsuppored mode
-        free(file);
+        free(fp);
         return NULL;
     }
 
     int fd = open(path, flags);
     if (fd == -1) {
-        free(FILE);
+        free(fp);
         return NULL;
     }
 
@@ -45,24 +46,24 @@ size_t fread(void* ptr, size_t size, size_t count, FILE* stream) {
     if (!stream || !ptr || size == 0 || count == 0) { return 0; }
 
     size_t total = size * count;
-    ssize_t read = read(stream->_file, ptr, total);
+    ssize_t readb = read(stream->_file, ptr, total);
 
-    if (read < 0) return 0;
+    if (readb < 0) return 0;
 
-    stream->offset += read;
-    return read / size;
+    stream->_offset += readb;
+    return readb / size;
 }
 
 size_t fwrite(void* ptr, size_t size, size_t count, FILE* stream) {
     if (!stream || !ptr || size == 0 || count == 0) { return 0; }
 
     size_t total = size * count;
-    ssize_t written = write(stream->_file, ptr, total);
+    ssize_t writtenb = write(stream->_file, ptr, total);
 
-    if (read < 0) return 0;
+    if (writtenb < 0) return 0;
 
-    stream->offset += written;
-    return written / size;
+    stream->_offset += writtenb;
+    return writtenb / size;
 }
 
 // TODO
diff --git a/libc/stdio/printf.c b/libc/stdio/printf.c
index aa72a35..a292c4f 100644
--- a/libc/stdio/printf.c
+++ b/libc/stdio/printf.c
@@ -11,8 +11,9 @@ typedef struct {
 } printfEnv_t;
 
 /* Helpers */
-static void _dynamicPutc(char c, printfEnv_t* env) {
-    if (!env->buf) { return; }
+static void _dynamicPutc(char c, void* arg) {
+    printfEnv_t* env = (printfEnv_t*)arg;
+    if (!env->buf) { return; }
 
     if (env->offset < env->buflen) {
         env->buf[env->offset++] = c;
@@ -27,8 +28,9 @@ static void _dynamicPutc(char c, printfEnv_t* env) {
     }
 }
 
-static void _staticPutc(char c, printfEnv_t* env) {
-    if (!env->buf) { return; }
+static void _staticPutc(char c, void* arg) {
+    printfEnv_t* env = (printfEnv_t*)arg;
+    if (!env->buf) { return; }
 
     if (env->offset < env->buflen) {
         env->buf[env->offset] = c;
@@ -37,7 +39,10 @@ static void _staticPutc(char c, printfEnv_t* env) {
 }
 
 /* Impementation */
-int vpprintf(void (*outfn)(char c, void* arg), void* arg, const char* fmt, va_list va) { /* TODO */ }
+int vpprintf(void (*outfn)(char c, void* arg), void* arg, const char* fmt, va_list va) {
+    // TODO
+    return -1;
+}
 
 int vsnprintf(char* str, size_t size, const char* fmt, va_list va) {
     printfEnv_t env;
@@ -71,10 +76,10 @@ int vfprintf(FILE* stream, const char* fmt, va_list va) {
 int vprintf(const char* fmt, va_list va) { return vfprintf(stdout, fmt, va); }
 
 // Print using an custom putc function
-int pprintf(void (*outfn)(char c), const char* fmt, ...) {
+int pprintf(void (*outfn)(char c, void* arg), void* arg, const char* fmt, ...) {
     va_list va;
     va_start(va, fmt);
-    int ret = vpprintf(outfn, fmt, va);
+    int ret = vpprintf(outfn, arg, fmt, va);
     va_end(va);
     return ret;
 }
diff --git a/libc/stdio/scanf.c b/libc/stdio/scanf.c
deleted file mode 100644
index f7d8d8f..0000000
--- a/libc/stdio/scanf.c
+++ /dev/null
@@ -1,10 +0,0 @@
-#include <stdio.h>
-
-// TODO
-int scanf(const char* fmt, ...);
-int vscanf(const char* fmt, va_list va);
-int fscanf(FILE* stream, const char* fmt, ...);
-int vfscanf(FILE* stream, const char* fmt, va_list va);
-int sscanf(const char* str, const char* fmt, ...);
-int vsscanf(const char* str, const char* fmt, va_list va);
-
diff --git a/libc/stdlib/alloc.c b/libc/stdlib/alloc.c
index 56364e1..90570d9 100644
--- a/libc/stdlib/alloc.c
+++ b/libc/stdlib/alloc.c
@@ -33,5 +33,5 @@ void* realloc(void* ptr, size_t size) {
     return newptr;
 }
 
-void free(void* ptr) { _free(ptr); }
+void free(void* ptr) { _free(ptr); }
 
diff --git a/libc/time/sleep.c b/libc/time/sleep.c
index b45d79c..26de4e8 100644
--- a/libc/time/sleep.c
+++ b/libc/time/sleep.c
@@ -6,7 +6,7 @@
 void sleep(size_t s) { _sleep(s*1000); }
 
 // Millisecond sleep
-void msleep(size_t ms) { _sleep(s); }
+void msleep(size_t ms) { _sleep(ms); }
 
 // Microsecond sleep
 void usleep(size_t us) { /* TODO */ }