initial check-in, version 0.5.0v0.5.0

96 files changed, 2857 insertions, 0 deletions

diff --git a/src/stdio/__fclose_ca.c b/src/stdio/__fclose_ca.c
new file mode 100644
index 0000000..e0b12a1
--- /dev/null
+++ b/src/stdio/__fclose_ca.c
@@ -0,0 +1,6 @@
+#include "stdio_impl.h"
+
+int __fclose_ca(FILE *f)
+{
+	return f->close(f);
+}
diff --git a/src/stdio/__fdopen.c b/src/stdio/__fdopen.c
new file mode 100644
index 0000000..6ad7c57
--- /dev/null
+++ b/src/stdio/__fdopen.c
@@ -0,0 +1,52 @@
+#include "stdio_impl.h"
+
+FILE *__fdopen(int fd, const char *mode)
+{
+	FILE *f;
+	struct termios tio;
+	int plus = !!strchr(mode, '+');
+
+	/* Check for valid initial mode character */
+	if (!strchr("rwa", *mode)) return 0;
+
+	/* Allocate FILE+buffer or fail */
+	if (!(f=malloc(sizeof *f + UNGET + BUFSIZ))) return 0;
+
+	/* Zero-fill only the struct, not the buffer */
+	memset(f, 0, sizeof *f);
+
+	/* Impose mode restrictions */
+	if (!plus) f->flags = (*mode == 'r') ? F_NOWR : F_NORD;
+
+	/* Set append mode on fd if opened for append */
+	if (*mode == 'a') {
+		int flags = __syscall_fcntl(fd, F_GETFL, 0);
+		__syscall_fcntl(fd, F_SETFL, flags | O_APPEND);
+	}
+
+	f->fd = fd;
+	f->buf = (unsigned char *)f + sizeof *f + UNGET;
+	f->buf_size = BUFSIZ;
+
+	/* Activate line buffered mode for terminals */
+	f->lbf = EOF;
+	if (!(f->flags & F_NOWR) && !__syscall_ioctl(fd, TCGETS, &tio))
+		f->lbf = '\n';
+
+	/* Initialize op ptrs. No problem if some are unneeded. */
+	f->read = __stdio_read;
+	f->write = __stdio_write;
+	f->seek = __stdio_seek;
+	f->close = __stdio_close;
+
+	/* Add new FILE to open file list */
+	OFLLOCK();
+	f->next = ofl_head;
+	if (ofl_head) ofl_head->prev = f;
+	ofl_head = f;
+	OFLUNLOCK();
+
+	return f;
+}
+
+weak_alias(__fdopen, fdopen);
diff --git a/src/stdio/__fopen_rb_ca.c b/src/stdio/__fopen_rb_ca.c
new file mode 100644
index 0000000..57d9b73
--- /dev/null
+++ b/src/stdio/__fopen_rb_ca.c
@@ -0,0 +1,18 @@
+#include "stdio_impl.h"
+
+FILE *__fopen_rb_ca(const char *filename, FILE *f, unsigned char *buf, size_t len)
+{
+	memset(f, 0, sizeof *f);
+
+	f->fd = __syscall_open(filename, O_RDONLY, 0);
+	if (f->fd < 0) return 0;
+
+	f->flags = F_NOWR | F_PERM;
+	f->buf = buf + UNGET;
+	f->buf_size = len - UNGET;
+	f->read = __stdio_read;
+	f->seek = __stdio_seek;
+	f->close = __stdio_close;
+
+	return f;
+}
diff --git a/src/stdio/__fpending.c b/src/stdio/__fpending.c
new file mode 100644
index 0000000..a4334e2
--- /dev/null
+++ b/src/stdio/__fpending.c
@@ -0,0 +1,6 @@
+#include "stdio_impl.h"
+
+size_t __fpending(FILE *f)
+{
+	return f->wend ? f->wpos - f->wbase : 0;
+}
diff --git a/src/stdio/__ofl.c b/src/stdio/__ofl.c
new file mode 100644
index 0000000..7d9652c
--- /dev/null
+++ b/src/stdio/__ofl.c
@@ -0,0 +1,3 @@
+#include "stdio_impl.h"
+
+struct ofl __ofl;
diff --git a/src/stdio/__overflow.c b/src/stdio/__overflow.c
new file mode 100644
index 0000000..e35104d
--- /dev/null
+++ b/src/stdio/__overflow.c
@@ -0,0 +1,52 @@
+#include "stdio_impl.h"
+
+static int overflow(FILE *f, int c)
+{
+	/* Initialize if we're not already writing */
+	if (!f->wend) {
+		/* Fail if we're in error state or unwritable. */
+		if (f->flags & (F_ERR|F_NOWR)) return EOF;
+
+		/* Set byte orientation -1,0=>-1; 1=>1 */
+		f->mode |= f->mode-1;
+
+		/* Clear read buffer (easier than summoning nasal demons) */
+		f->rpos = f->rend = f->rstop = 0;
+
+		/* Activate write through the buffer */
+		f->wpos = f->wbase = f->buf;
+		f->wend = f->buf + f->buf_size;
+		f->wstop = (f->lbf < 0) ? f->wend - 1 : 0;
+	}
+
+	/* Buffer can always hold at least 1 byte... */
+	if (c != EOF) {
+		*f->wpos++ = c;
+		if (f->wpos <= f->wstop && c != f->lbf) return c;
+	}
+	/* ...since if the next call fails, buffer is empty. */
+	if (f->write(f, f->wbase, f->wpos - f->wbase) < 0) {
+		f->flags |= F_ERR;
+		f->wpos = f->wbase = f->wend = f->wstop = 0;
+		return EOF;
+	}
+
+	/* Buffer is empty so reset position to beginning */
+	f->wpos = f->wbase;
+
+	return c;
+}
+
+int __overflow(FILE *f, int c)
+{
+	return overflow(f, c & 0xff);
+}
+
+int __oflow(FILE *f)
+{
+	overflow(f, EOF);
+	return (f->flags & F_ERR) ? EOF : 0;
+}
+
+/* Link flush-on-exit code iff any stdio write functions are linked. */
+int (*const __fflush_on_exit)(FILE *) = fflush;
diff --git a/src/stdio/__scanf.c b/src/stdio/__scanf.c
new file mode 100644
index 0000000..185615d
--- /dev/null
+++ b/src/stdio/__scanf.c
@@ -0,0 +1,487 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <ctype.h>
+#include <wchar.h>
+#include <wctype.h>
+#include <limits.h>
+#include <string.h>
+#include <errno.h>
+#include <math.h>
+#include <float.h>
+
+#include "__scanf.h"
+
+static int read(rctx_t *r)
+{
+	if (--r->w < 0) return r->w = -1;
+	if (r->u) r->u = 0;
+	else r->read(r);
+	return r->c;
+}
+
+static void unread(rctx_t *r)
+{
+	//if (r->u || r->w < 0) return;
+	if (r->w < 0) return;
+	r->w++;
+	r->u = 1;
+}
+
+#define SIZE_hh -2
+#define SIZE_h  -1
+#define SIZE_def 0
+#define SIZE_l   1
+#define SIZE_ll  2
+#define SIZE_L   3
+
+static void store_int(void *dest, int size, int neg, unsigned long long i)
+{
+	if (!dest) return;
+	if (neg) i = -i;
+	switch (size) {
+	case SIZE_hh:
+		*(char *)dest = i;
+		break;
+	case SIZE_h:
+		*(short *)dest = i;
+		break;
+	case SIZE_def:
+		*(int *)dest = i;
+		break;
+	case SIZE_l:
+		*(long *)dest = i;
+		break;
+	case SIZE_ll:
+		*(long long *)dest = i;
+		break;
+	}
+}
+
+static void *arg_n(va_list ap, unsigned int n)
+{
+	void *p;
+	unsigned int i;
+	va_list ap2;
+	va_copy(ap2, ap);
+	for (i=n; i>1; i--) va_arg(ap2, void *);
+	p = va_arg(ap2, void *);
+	va_end(ap2);
+	return p;
+}
+
+int __scanf(rctx_t *r, const wchar_t *fmt, va_list ap)
+{
+	int mode=0;
+	int width;
+	int size;
+	const wchar_t *p, *z;
+	int c, l, t, m;
+	long long dummy;
+	char *s;
+	wchar_t *wcs;
+	mbstate_t st;
+	int wide = r->wide;
+	void *dest=NULL;
+	int invert;
+	unsigned long long i=0;
+	int neg=0;
+	int matches=0;
+	long double f;
+	int (*is_space)(int) = r->is_space;
+
+	for (p=fmt; *p; ) {
+		if (is_space(*p)) {
+			do p++; while (is_space(*p));
+			do r->w=1; while (is_space(read(r)));
+			unread(r);
+			continue;
+		} else if (*p != '%' || p[1] == '%') {
+			if (*p == '%') p++;
+			r->w = 1;
+			if (*p++ != read(r))
+				goto match_fail;
+			continue;
+		}
+		p++;
+		if (mode != 1) {
+			for (z=p; isdigit(*z); z++);
+			if (*z != '$' && *z != '*') {
+				if (mode == 0) mode = 1;
+				else goto fmt_fail;
+			} else if (*z != '*') {
+				int pos = 0;
+				mode = 2;
+				for (; p<z; p++) {
+					pos = 10*pos + *p - '0';
+				}
+				p++;
+				if (!pos) goto fmt_fail;
+				dest = arg_n(ap, pos);
+			}
+		}
+		if (*p == '*') {
+			dest = NULL;
+			p++;
+		} else if (mode == 1) {
+			dest = va_arg(ap, void *);
+		}
+		
+		if (!*p) goto fmt_fail;
+
+		width = 0;
+		for (; isdigit(*p); p++) {
+			width = 10*width + *p - '0';
+		}
+
+		size = 0;
+		switch (*p++) {
+		case 0:
+			goto fmt_fail;
+		case 'h':
+			if (*p == 'h') p++, size = SIZE_hh;
+			else size = SIZE_h;
+			break;
+		case 'l':
+			if (*p == 'l') p++, size = SIZE_ll;
+			else size = SIZE_l;
+			break;
+		case 'j':
+			size = SIZE_ll;
+			break;
+		case 'z':
+		case 't':
+			size = SIZE_l;
+			break;
+		case 'L':
+			size = SIZE_L;
+			break;
+		case 'd': case 'i': case 'o': case 'u': case 'x':
+		case 'a': case 'e': case 'f': case 'g':
+		case 'A': case 'E': case 'F': case 'G': case 'X':
+		case 's': case 'c': case '[':
+		case 'S': case 'C':
+		case 'p': case 'n':
+			p--;
+			break;
+		default:
+			goto fmt_fail;
+		}
+
+		t = *p++;
+
+		switch (t) {
+		case 'C':
+		case 'c':
+			if (width < 1) width = 1;
+		case 's':
+			if (size == SIZE_l) t &= ~0x20;
+		case 'd': case 'i': case 'o': case 'u': case 'x':
+		case 'a': case 'e': case 'f': case 'g':
+		case 'A': case 'E': case 'F': case 'G': case 'X':
+		case '[': case 'S':
+		case 'p': case 'n':
+			if (width < 1) width = INT_MAX;
+			break;
+		default:
+			goto fmt_fail;
+		}
+
+		r->w = width;
+
+		if (t != 'n') {
+			if (read(r) < 0) goto input_fail;
+			unread(r);
+		}
+
+		switch (t) {
+		case 'n':
+			store_int(dest, size, 0, r->l - r->u);
+			/* do not increment match count, etc! */
+			continue;
+		case 'C':
+			wcs = dest ? dest : (void *)&dummy;
+			st = (mbstate_t){ 0 };
+			while ((c=read(r)) >= 0) {
+				if (wide) {
+					if (dest) *wcs++ = c;
+				} else {
+					char ch = c;
+					switch (mbrtowc(wcs, &ch, 1, &st)) {
+					case -1:
+						goto enc_fail;
+					case -2:
+						break;
+					default:
+						if (dest) wcs++;
+					}
+				}
+			}
+			if (r->w > 0) goto match_fail;
+			break;
+		case 'c':
+			s = dest ? dest : (void *)&dummy;
+			while ((c=read(r)) >= 0) {
+				if (wide) {
+					if ((l=wctomb(s, c)) < 0)
+						goto enc_fail;
+					if (dest) s += l;
+				} else {
+					if (dest) *s++ = c;
+				}
+			}
+			if (r->w > 0) goto match_fail;
+			break;
+		case '[':
+			wcs = dest ? dest : (void *)&dummy;
+			s = dest ? dest : (void *)&dummy;
+			if (!wide && size == SIZE_l) st = (mbstate_t){ 0 };
+
+			if (*p == '^') p++, invert = 1;
+			else invert = 0;
+
+			if (wide) {
+				for (m=0; (c=read(r)) >= 0; m=1) {
+					for (z=p; *z && *z != c && (*z != ']' || z==p); z++);
+					if (!*z) goto fmt_fail;
+					if (*z == c && (*z != ']' || z==p)) {
+						if (invert) break;
+					} else {
+						if (!invert) break;
+					}
+					if (size == SIZE_l) {
+						if (dest) *wcs++ = c;
+					} else {
+						if ((l=wctomb(s, c)) < 0)
+							goto enc_fail;
+						if (dest) s += l;
+					}
+				}
+				for (p++; *p && *p != ']'; p++);
+				p++;
+			} else {
+				unsigned char scanset[257];
+				memset(scanset, invert, sizeof scanset);
+				scanset[0] = 0;
+				for (z=p; *z && (*z != ']' || z==p); z++)
+					scanset[1+*z] = 1-invert;
+				if (!*z) goto fmt_fail;
+				p=z+1;
+				c=0;
+				for (m=0; scanset[(c=read(r))+1]; m=1) {
+					if (size == SIZE_l) {
+						char ch = c;
+						switch (mbrtowc(wcs, &ch, 1, &st)) {
+						case -1:
+							goto enc_fail;
+						case -2:
+							break;
+						default:
+							if (dest) wcs++;
+						}
+					} else {
+						if (dest) *s++ = c;
+					}
+				}
+			}
+			if (!m) goto match_fail;
+			if (dest) {
+				if (size == SIZE_l) *wcs++ = 0;
+				else *s++ = 0;
+			}
+			break;
+		default:
+			/* read unlimited number of spaces, then reset width */
+			do r->w = 1; while (is_space(c = read(r)));
+			if (c < 0) goto input_fail;
+			unread(r);
+			r->w = width;
+		}
+
+		switch (t) {
+		case 'p':
+		case 'X':
+			t = 'x';
+		case 'd':
+		case 'i':
+		case 'o':
+		case 'u':
+		case 'x':
+			i = m = neg = 0;
+			if ((c=read(r)) == '-') neg=1;
+			else if (c != '+') unread(r);
+			switch (t) {
+			case 'i':
+			case 'x':
+				if ((c=read(r)) != '0') {
+					if (t == 'i') t = 'd';
+					unread(r);
+					break;
+				}
+				if (((c=read(r))|0x20) != 'x') {
+					if (t == 'i') {
+						t = 'o';
+						/* lone 0 is valid octal */
+						if ((unsigned)(c-'0') >= 8) {
+							m = 1;
+							goto int_finish;
+						}
+					}
+					unread(r);
+					break;
+				}
+				t = 'x';
+			}
+		}
+		
+		switch (t) {
+		case 'd':
+		case 'u':
+			for (m=0; isdigit(c=read(r)); m=1)
+				i = 10*i + c-'0';
+			goto int_finish;
+		case 'o':
+			for (m=0; (unsigned)(c=read(r))-'0' < 8; m=1)
+				i = (i<<3) + c-'0';
+			goto int_finish;
+		case 'x':
+			for (m=0; ; m=1) {
+				if (isdigit(c=read(r))) {
+					i = (i<<4) + c-'0';
+				} else if ((unsigned)(c|0x20)-'a' < 6) {
+					i = (i<<4) + (c|0x20)-'a'+10;
+				} else break;
+			}
+		int_finish:
+			if (!m) goto match_fail;
+			store_int(dest, size, neg, i);
+			break;
+		case 'a':
+		case 'e':
+		case 'f':
+		case 'g':
+			f = 0.0;
+			neg = m = 0;
+			if ((c=read(r)) == '-') neg=1;
+			else if (c != '+') unread(r);
+			/* FIXME: check for INF/NAN strings here */
+			if (read(r)=='0' && (m=1, (read(r)|0x20) == 'x'))
+				goto hexfloat;
+			else unread(r);
+			for (; isdigit(c=read(r)); m=1)
+				f = 10.0 * f + (c-'0');
+			if (c=='.') {
+				double mag = 10.0;
+				for (; isdigit(c=read(r)); mag*=10.0)
+					f += (c-'0')/mag;
+			}
+			if ((c|0x20)=='e') {
+				int ex=0, en=0;
+				m = 0;
+				if ((c=read(r))=='-') en=1;
+				else if (c!='+') unread(r);
+				for (; isdigit(c=read(r)); m=1)
+					if (ex < LDBL_MAX_10_EXP)
+						ex = 10 * ex + (c-'0');
+				if (ex > LDBL_MAX_10_EXP)
+					f = en ? 0 : INFINITY;
+				else {
+					if (en) while (ex--) f/=10.0;
+					else while (ex--) f*=10.0;
+				}
+			}
+			goto writefloat;
+hexfloat:
+			m = 0;
+			for (; isxdigit(c=read(r)); m=1)
+				if (isdigit(c)) f = 16.0*f + (c-'0');
+				else f = 16.0*f + ((c|32)-'a'+10);
+			if (c=='.') {
+				double mag = 1/16.0;
+				for (; isxdigit(c=read(r)); mag*=1/16.0)
+					if (isdigit(c)) f += (c-'0')*mag;
+					else f += ((c|32)-'a'+10)*mag;
+			}
+			if ((c|0x20)=='p') {
+				int ex=0, en=0;
+				m = 0;
+				if ((c=read(r))=='-') en=1;
+				else if (c!='+') unread(r);
+				for (; isdigit(c=read(r)); m=1)
+					if (ex < LDBL_MAX_EXP)
+						ex = 10 * ex + (c-'0');
+				if (ex > LDBL_MAX_EXP)
+					f = en ? 0 : INFINITY;
+				else {
+					if (en) while (ex--) f*=0.5;
+					else while (ex--) f*=2.0;
+				}
+			}
+writefloat:
+			if (!m) goto match_fail;
+			if (neg) f *= -1.0;
+			if (dest) switch (size) {
+			case SIZE_def:
+				*(float *)dest = f;
+				break;
+			case SIZE_l:
+				*(double *)dest = f;
+				break;
+			case SIZE_L:
+				*(long double *)dest = f;
+				break;
+			}
+			break;
+		case 'S':
+			wcs = dest ? dest : (void *)&dummy;
+			st = (mbstate_t){ 0 };
+			while((c=read(r)) >= 0) {
+				if (wide) {
+					if (is_space(c)) break;
+					if (dest) *wcs++ = c;
+				} else {
+					char ch = c;
+					if (is_space(c)) break;
+					switch (mbrtowc(wcs, &ch, 1, &st)) {
+					case -1:
+						goto enc_fail;
+					case -2:
+						break;
+					default:
+						if (dest) wcs++;
+					}
+				}
+			}
+			if (dest) *wcs++ = 0;
+			break;
+		case 's':
+			s = dest ? dest : (void *)&dummy;
+			while((c=read(r)) >= 0) {
+				if (wide) {
+					if (is_space(c)) break;
+					if ((l=wctomb(s, c)) < 0)
+						goto enc_fail;
+					if (dest) s += l;
+				} else {
+					if (is_space(c)) break;
+					if (dest) *s++ = c;
+				}
+			}
+			if (dest) *s++ = 0;
+			break;
+		}
+
+		/* unread will do nothing if field width was exhausted */
+		unread(r);
+		if (dest) matches++;
+	}
+	return matches;
+enc_fail:
+	errno = EILSEQ;
+fmt_fail:
+input_fail:
+	if (!matches) matches--;
+match_fail:
+	unread(r);
+	return matches;
+}
diff --git a/src/stdio/__scanf.h b/src/stdio/__scanf.h
new file mode 100644
index 0000000..e549b97
--- /dev/null
+++ b/src/stdio/__scanf.h
@@ -0,0 +1,16 @@
+#include <wchar.h>
+
+typedef struct rctx
+{
+	void (*read)(struct rctx *);
+	void *opaque;
+	int wide;
+	int (*is_space)();
+	int l;
+	int e;
+	int c;
+	int u;
+	int w;
+} rctx_t;
+
+int __scanf(rctx_t *, const wchar_t *, va_list);
diff --git a/src/stdio/__stdio_close.c b/src/stdio/__stdio_close.c
new file mode 100644
index 0000000..24fef33
--- /dev/null
+++ b/src/stdio/__stdio_close.c
@@ -0,0 +1,6 @@
+#include "stdio_impl.h"
+
+int __stdio_close(FILE *f)
+{
+	return __syscall_close(f->fd);
+}
diff --git a/src/stdio/__stdio_read.c b/src/stdio/__stdio_read.c
new file mode 100644
index 0000000..ee7e125
--- /dev/null
+++ b/src/stdio/__stdio_read.c
@@ -0,0 +1,6 @@
+#include "stdio_impl.h"
+
+size_t __stdio_read(FILE *f, unsigned char *buf, size_t len)
+{
+	return __syscall_read(f->fd, buf, len);
+}
diff --git a/src/stdio/__stdio_seek.c b/src/stdio/__stdio_seek.c
new file mode 100644
index 0000000..fdb9fe7
--- /dev/null
+++ b/src/stdio/__stdio_seek.c
@@ -0,0 +1,15 @@
+#include "stdio_impl.h"
+
+static off_t retneg1(FILE *f, off_t off, int whence)
+{
+	return -1;
+}
+
+off_t __stdio_seek(FILE *f, off_t off, int whence)
+{
+	off_t ret = __syscall_lseek(f->fd, off, whence);
+	/* Detect unseekable files and optimize future failures out */
+	if (ret < 0 && off == 0 && whence == SEEK_CUR)
+		f->seek = retneg1;
+	return ret;
+}
diff --git a/src/stdio/__stdio_write.c b/src/stdio/__stdio_write.c
new file mode 100644
index 0000000..7854562
--- /dev/null
+++ b/src/stdio/__stdio_write.c
@@ -0,0 +1,9 @@
+#include "stdio_impl.h"
+
+size_t __stdio_write(FILE *f, const unsigned char *buf, size_t len)
+{
+	const unsigned char *stop = buf+len;
+	ssize_t cnt = 1;
+	for (; buf<stop && (cnt=__syscall_write(f->fd, buf, len))>0; buf+=cnt);
+	return len-(stop-buf);
+}
diff --git a/src/stdio/__uflow.c b/src/stdio/__uflow.c
new file mode 100644
index 0000000..5a51d61
--- /dev/null
+++ b/src/stdio/__uflow.c
@@ -0,0 +1,7 @@
+#include "stdio_impl.h"
+
+int __uflow(FILE *f)
+{
+	if (__underflow(f) < 0) return EOF;
+	else return *f->rpos++;
+}
diff --git a/src/stdio/__underflow.c b/src/stdio/__underflow.c
new file mode 100644
index 0000000..b769f4e
--- /dev/null
+++ b/src/stdio/__underflow.c
@@ -0,0 +1,38 @@
+#include "stdio_impl.h"
+
+int __underflow(FILE *f)
+{
+	ssize_t cnt;
+
+	/* Read from buffer (Do we ever get called when this is true??) */
+	if (f->rpos < f->rstop) return *f->rpos;
+
+	/* Initialize if we're not already reading */
+	if (!f->rstop) {
+		/* Fail immediately if unreadable, eof, or error state. */
+		if (f->flags & (F_EOF|F_ERR|F_NORD)) return EOF;
+
+		/* Set byte orientation -1,0=>-1; 1=>1 */
+		f->mode |= f->mode-1;
+
+		/* Flush any unwritten output; fail on error. */
+		if (f->wpos > f->buf && __oflow(f)) return EOF;
+
+		/* Disallow writes to buffer. */
+		f->wstop = 0;
+	}
+
+	/* Perform the underlying read operation */
+	if ((cnt=f->read(f, f->buf, f->buf_size)) + 1 <= 1) {
+		/* Set flags and leave read mode */
+		f->flags |= F_EOF | (cnt & F_ERR);
+		f->rpos = f->rend = f->rstop = 0;
+		return EOF;
+	}
+
+	/* Setup buffer pointers for reading from buffer */
+	f->rpos = f->buf;
+	f->rend = f->rstop = f->buf + cnt;
+
+	return *f->rpos;
+}
diff --git a/src/stdio/asprintf.c b/src/stdio/asprintf.c
new file mode 100644
index 0000000..79e59c2
--- /dev/null
+++ b/src/stdio/asprintf.c
@@ -0,0 +1,14 @@
+#include <stdio.h>
+#include <stdarg.h>
+
+int vasprintf(char **, const char *, va_list);
+
+int asprintf(char **s, const char *fmt, ...)
+{
+	int ret;
+	va_list ap;
+	va_start(ap, fmt);
+	ret = vasprintf(s, fmt, ap);
+	va_end(ap);
+	return ret;
+}
diff --git a/src/stdio/clearerr.c b/src/stdio/clearerr.c
new file mode 100644
index 0000000..3bf94d3
--- /dev/null
+++ b/src/stdio/clearerr.c
@@ -0,0 +1,10 @@
+#include "stdio_impl.h"
+
+void clearerr(FILE *f)
+{
+	FLOCK(f);
+	f->flags &= ~(F_EOF|F_ERR);
+	FUNLOCK(f);
+}
+
+weak_alias(clearerr, clearerr_unlocked);
diff --git a/src/stdio/dprintf.c b/src/stdio/dprintf.c
new file mode 100644
index 0000000..fa28322
--- /dev/null
+++ b/src/stdio/dprintf.c
@@ -0,0 +1,12 @@
+#include <stdio.h>
+#include <stdarg.h>
+
+int dprintf(int fd, const char *fmt, ...)
+{
+	int ret;
+	va_list ap;
+	va_start(ap, fmt);
+	ret = vdprintf(fd, fmt, ap);
+	va_end(ap);
+	return ret;
+}
diff --git a/src/stdio/fclose.c b/src/stdio/fclose.c
new file mode 100644
index 0000000..26bc37e
--- /dev/null
+++ b/src/stdio/fclose.c
@@ -0,0 +1,21 @@
+#include "stdio_impl.h"
+
+int fclose(FILE *f)
+{
+	int r;
+	int perm = f->flags & F_PERM;
+
+	if (!perm) {
+		OFLLOCK();
+		if (f->prev) f->prev->next = f->next;
+		if (f->next) f->next->prev = f->prev;
+		if (ofl_head == f) ofl_head = f->next;
+		OFLUNLOCK();
+	}
+
+	r = fflush(f) | f->close(f);
+
+	if (!perm) free(f);
+	
+	return r;
+}
diff --git a/src/stdio/feof.c b/src/stdio/feof.c
new file mode 100644
index 0000000..f2b739b
--- /dev/null
+++ b/src/stdio/feof.c
@@ -0,0 +1,10 @@
+#include "stdio_impl.h"
+
+#undef feof
+
+int feof(FILE *f)
+{
+	return !!(f->flags & F_EOF);
+}
+
+weak_alias(feof, feof_unlocked);
diff --git a/src/stdio/ferror.c b/src/stdio/ferror.c
new file mode 100644
index 0000000..f535fbe
--- /dev/null
+++ b/src/stdio/ferror.c
@@ -0,0 +1,10 @@
+#include "stdio_impl.h"
+
+#undef ferror
+
+int ferror(FILE *f)
+{
+	return !!(f->flags & F_ERR);
+}
+
+weak_alias(ferror, ferror_unlocked);
diff --git a/src/stdio/fflush.c b/src/stdio/fflush.c
new file mode 100644
index 0000000..cf3f5b0
--- /dev/null
+++ b/src/stdio/fflush.c
@@ -0,0 +1,50 @@
+#include "stdio_impl.h"
+
+static int __fflush_unlocked(FILE *f)
+{
+	/* If writing, flush output. */
+	if (f->wpos > f->buf && __oflow(f)) return -1;
+
+	/* If reading, sync position, per POSIX */
+	if (f->rpos < f->rend) f->seek(f, f->rpos-f->rend, SEEK_CUR);
+	f->rpos = f->rend;
+
+	/* Hook for special behavior on flush */
+	if (f->flush) f->flush(f);
+
+	return (f->flags & F_ERR) ? EOF : 0;
+}
+
+/* stdout.c will override this if linked */
+static FILE *const __dummy = 0;
+weak_alias(__dummy, __stdout_to_flush);
+
+int fflush(FILE *f)
+{
+	int r;
+	FILE *next;
+
+	if (f) {
+		FLOCK(f);
+		r = __fflush_unlocked(f);
+		FUNLOCK(f);
+		return r;
+	}
+
+	r = __stdout_to_flush ? fflush(__stdout_to_flush) : 0;
+
+	OFLLOCK();
+	for (f=ofl_head; f; f=next) {
+		FLOCK(f);
+		OFLUNLOCK();
+		r |= __fflush_unlocked(f);
+		OFLLOCK();
+		next = f->next;
+		FUNLOCK(f);
+	}
+	OFLUNLOCK();
+	
+	return r;
+}
+
+weak_alias(__fflush_unlocked, fflush_unlocked);
diff --git a/src/stdio/fgetc.c b/src/stdio/fgetc.c
new file mode 100644
index 0000000..3a7f1e3
--- /dev/null
+++ b/src/stdio/fgetc.c
@@ -0,0 +1,10 @@
+#include "stdio_impl.h"
+
+int fgetc(FILE *f)
+{
+	int c;
+	FLOCK(f);
+	c = f->rpos < f->rstop ? *f->rpos++ : __uflow(f);
+	FUNLOCK(f);
+	return c;
+}
diff --git a/src/stdio/fgetpos.c b/src/stdio/fgetpos.c
new file mode 100644
index 0000000..5b663d1
--- /dev/null
+++ b/src/stdio/fgetpos.c
@@ -0,0 +1,11 @@
+#include "stdio_impl.h"
+
+int fgetpos(FILE *f, fpos_t *pos)
+{
+	off_t off = __ftello(f);
+	if (off < 0) return -1;
+	*(off_t *)pos = off;
+	return 0;
+}
+
+LFS64(fgetpos);
diff --git a/src/stdio/fgets.c b/src/stdio/fgets.c
new file mode 100644
index 0000000..7939303
--- /dev/null
+++ b/src/stdio/fgets.c
@@ -0,0 +1,34 @@
+#include "stdio_impl.h"
+
+#define MIN(a,b) ((a)<(b) ? (a) : (b))
+
+char *fgets(char *s, int n, FILE *f)
+{
+	char *p = s;
+	unsigned char *z;
+	size_t k;
+
+	if (!n--) return 0;
+
+	FLOCK(f);
+
+	while (n && !feof(f)) {
+		z = memchr(f->rpos, '\n', f->rend - f->rpos);
+		k = z ? z - f->rpos + 1 : f->rend - f->rpos;
+		k = MIN(k, n);
+		memcpy(p, f->rpos, k);
+		f->rpos += k;
+		p += k;
+		n -= k;
+		if (z) break;
+		__underflow(f);
+	}
+	*p = 0;
+	if (ferror(f)) p = s;
+
+	FUNLOCK(f);
+
+	return (p == s) ? 0 : s;
+}
+
+weak_alias(fgets, fgets_unlocked);
diff --git a/src/stdio/fgetwc.c b/src/stdio/fgetwc.c
new file mode 100644
index 0000000..c990545
--- /dev/null
+++ b/src/stdio/fgetwc.c
@@ -0,0 +1,51 @@
+#include "stdio_impl.h"
+
+wint_t __fgetwc_unlocked(FILE *f)
+{
+	mbstate_t st = { 0 };
+	wchar_t wc;
+	int c;
+	unsigned char b;
+	size_t l;
+
+	f->mode |= f->mode+1;
+
+	/* Convert character from buffer if possible */
+	if (f->rpos < f->rend) {
+		l = mbrtowc(&wc, f->rpos, f->rend - f->rpos, &st);
+		if (l+2 >= 2) {
+			f->rpos += l + !l; /* l==0 means 1 byte, null */
+			return wc;
+		}
+		if (l == -1) {
+			f->rpos++;
+			return WEOF;
+		}
+	} else l = -2;
+
+	/* Convert character byte-by-byte from __uflow */
+	while (l == -2) {
+		b = c = __uflow(f);
+		if (c < 0) {
+			if (!mbsinit(&st)) errno = EILSEQ;
+			return WEOF;
+		}
+		l = mbrtowc(&wc, &b, 1, &st);
+		if (l == -1) return WEOF;
+	}
+
+	FUNLOCK(f);
+	return wc;
+}
+
+wint_t fgetwc(FILE *f)
+{
+	wint_t c;
+	FLOCK(f);
+	c = __fgetwc_unlocked(f);
+	FUNLOCK(f);
+	return c;
+}
+
+weak_alias(__fgetwc_unlocked, fgetwc_unlocked);
+weak_alias(__fgetwc_unlocked, getwc_unlocked);
diff --git a/src/stdio/fgetws.c b/src/stdio/fgetws.c
new file mode 100644
index 0000000..2e76b56
--- /dev/null
+++ b/src/stdio/fgetws.c
@@ -0,0 +1,27 @@
+#include "stdio_impl.h"
+
+wint_t __fgetwc_unlocked(FILE *);
+
+wchar_t *fgetws(wchar_t *s, int n, FILE *f)
+{
+	wchar_t *p = s;
+
+	if (!n--) return s;
+
+	FLOCK(f);
+
+	for (; n; n--) {
+		wint_t c = __fgetwc_unlocked(f);
+		if (c == WEOF) break;
+		*p++ = c;
+		if (c == '\n') break;
+	}
+	*p = 0;
+	if (ferror(f)) p = s;
+
+	FUNLOCK(f);
+
+	return (p == s) ? NULL : s;
+}
+
+weak_alias(fgetws, fgetws_unlocked);
diff --git a/src/stdio/fileno.c b/src/stdio/fileno.c
new file mode 100644
index 0000000..9ffb26d
--- /dev/null
+++ b/src/stdio/fileno.c
@@ -0,0 +1,8 @@
+#include "stdio_impl.h"
+
+int fileno(FILE *f)
+{
+	return f->fd;
+}
+
+weak_alias(fileno, fileno_unlocked);
diff --git a/src/stdio/fmemopen.c b/src/stdio/fmemopen.c
new file mode 100644
index 0000000..77a6074
--- /dev/null
+++ b/src/stdio/fmemopen.c
@@ -0,0 +1,16 @@
+#if 0
+#include "stdio_impl.h"
+
+static ssize_t mread(FILE *f, unsigned char *buf, size_t len)
+{
+	memcpy(buf, 
+}
+
+FILE *fmemopen(void *buf, size_t size, const char *mode)
+{
+	FILE *f = calloc(sizeof(FILE), 1);
+	if (!f) return 0;
+	
+	//
+}
+#endif
diff --git a/src/stdio/fopen.c b/src/stdio/fopen.c
new file mode 100644
index 0000000..670cf5f
--- /dev/null
+++ b/src/stdio/fopen.c
@@ -0,0 +1,34 @@
+#include "stdio_impl.h"
+
+FILE *fopen(const char *filename, const char *mode)
+{
+	FILE *f;
+	int fd;
+	int flags;
+	int plus = !!strchr(mode, '+');
+
+	/* Check for valid initial mode character */
+	if (!strchr("rwa", *mode)) {
+		errno = EINVAL;
+		return 0;
+	}
+
+	/* Compute the flags to pass to open() */
+	if (plus) flags = O_RDWR;
+	else if (*mode == 'r') flags = O_RDONLY;
+	else flags = O_WRONLY;
+	if (*mode != 'r') flags |= O_CREAT;
+	if (*mode == 'w') flags |= O_TRUNC;
+	if (*mode == 'a') flags |= O_APPEND;
+
+	fd = __syscall_open(filename, flags, 0666);
+	if (fd < 0) return 0;
+
+	f = __fdopen(fd, mode);
+	if (f) return f;
+
+	__syscall_close(fd);
+	return 0;
+}
+
+LFS64(fopen);
diff --git a/src/stdio/fprintf.c b/src/stdio/fprintf.c
new file mode 100644
index 0000000..a220cc1
--- /dev/null
+++ b/src/stdio/fprintf.c
@@ -0,0 +1,12 @@
+#include <stdio.h>
+#include <stdarg.h>
+
+int fprintf(FILE *f, const char *fmt, ...)
+{
+	int ret;
+	va_list ap;
+	va_start(ap, fmt);
+	ret = vfprintf(f, fmt, ap);
+	va_end(ap);
+	return ret;
+}
diff --git a/src/stdio/fputc.c b/src/stdio/fputc.c
new file mode 100644
index 0000000..ec85938
--- /dev/null
+++ b/src/stdio/fputc.c
@@ -0,0 +1,10 @@
+#include "stdio_impl.h"
+
+int fputc(int c, FILE *f)
+{
+	FLOCK(f);
+	if (c != f->lbf && f->wpos + 1 < f->wend) *f->wpos++ = c;
+	else c = __overflow(f, c);
+	FUNLOCK(f);
+	return c;
+}
diff --git a/src/stdio/fputs.c b/src/stdio/fputs.c
new file mode 100644
index 0000000..e6bdb20
--- /dev/null
+++ b/src/stdio/fputs.c
@@ -0,0 +1,10 @@
+#include "stdio_impl.h"
+
+int fputs(const char *s, FILE *f)
+{
+	size_t l = strlen(s);
+	if (!l) return 0;
+	return (int)fwrite(s, l, 1, f) - 1;
+}
+
+weak_alias(fputs, fputs_unlocked);
diff --git a/src/stdio/fputwc.c b/src/stdio/fputwc.c
new file mode 100644
index 0000000..b48bb74
--- /dev/null
+++ b/src/stdio/fputwc.c
@@ -0,0 +1,33 @@
+#include "stdio_impl.h"
+
+wint_t __fputwc_unlocked(wchar_t c, FILE *f)
+{
+	char mbc[MB_LEN_MAX];
+	int l;
+
+	f->mode |= f->mode+1;
+
+	if (isascii(c)) {
+		if (c != f->lbf && f->wpos + 1 < f->wend) *f->wpos++ = c;
+		else c = __overflow(f, c);
+	} else if (f->wpos + MB_LEN_MAX < f->wend) {
+		l = wctomb(f->wpos, c);
+		if (l < 0) c = WEOF;
+		else f->wpos += l;
+	} else {
+		l = wctomb(mbc, c);
+		if (l < 0 || __fwritex(mbc, l, f) < l) c = WEOF;
+	}
+	return c;
+}
+
+wint_t fputwc(wchar_t c, FILE *f)
+{
+	FLOCK(f);
+	c = __fputwc_unlocked(c, f);
+	FUNLOCK(f);
+	return 0;
+}
+
+weak_alias(__fputwc_unlocked, fputwc_unlocked);
+weak_alias(__fputwc_unlocked, putwc_unlocked);
diff --git a/src/stdio/fputws.c b/src/stdio/fputws.c
new file mode 100644
index 0000000..9057853
--- /dev/null
+++ b/src/stdio/fputws.c
@@ -0,0 +1,23 @@
+#include "stdio_impl.h"
+
+int fputws(const wchar_t *ws, FILE *f)
+{
+	unsigned char buf[BUFSIZ];
+	size_t l=0;
+
+	FLOCK(f);
+
+	f->mode |= f->mode+1;
+
+	while (ws && (l = wcsrtombs(buf, (void*)&ws, sizeof buf, 0))+1 > 1)
+		if (__fwritex(buf, l, f) < l) {
+			FUNLOCK(f);
+			return -1;
+		}
+
+	FUNLOCK(f);
+
+	return l; /* 0 or -1 */
+}
+
+weak_alias(fputws, fputws_unlocked);
diff --git a/src/stdio/fread.c b/src/stdio/fread.c
new file mode 100644
index 0000000..0fa0b2a
--- /dev/null
+++ b/src/stdio/fread.c
@@ -0,0 +1,49 @@
+#include "stdio_impl.h"
+
+#define MIN(a,b) ((a)<(b) ? (a) : (b))
+
+size_t fread(void *destv, size_t size, size_t nmemb, FILE *f)
+{
+	unsigned char *dest = destv;
+	size_t len = size*nmemb, l = len, k;
+
+	/* Never touch the file if length is zero.. */
+	if (!l) return 0;
+
+	FLOCK(f);
+
+	for (;;) {
+		/* First exhaust the buffer. */
+		k = MIN(f->rend - f->rpos, l);
+		memcpy(dest, f->rpos, k);
+		f->rpos += k;
+		dest += k;
+		l -= k;
+
+		/* Stop on EOF or errors */
+		if (f->flags & (F_EOF|F_ERR|F_NORD)) goto eof;
+
+		/* Done? Or going unbuffered? */
+		if (!l || l > f->buf_size/2) break;
+
+		/* Otherwise, refill & read thru buffer. */
+		__underflow(f);
+	}
+
+	/* Read the remainder directly */
+	for (; l; l-=k, dest+=k) {
+		k = f->read(f, dest, l);
+		if (k+1<=1) {
+			f->flags |= F_EOF | (F_ERR & k);
+			goto eof;
+		}
+	}
+
+	FUNLOCK(f);
+	return nmemb;
+eof:
+	FUNLOCK(f);
+	return (len-l)/size;
+}
+
+weak_alias(fread, fread_unlocked);
diff --git a/src/stdio/freopen.c b/src/stdio/freopen.c
new file mode 100644
index 0000000..8d3af9f
--- /dev/null
+++ b/src/stdio/freopen.c
@@ -0,0 +1,47 @@
+#include "stdio_impl.h"
+
+/* The basic idea of this implementation is to open a new FILE,
+ * hack the necessary parts of the new FILE into the old one, then
+ * close the new FILE. */
+
+/* Locking is not necessary because, in the event of failure, the stream
+ * passed to freopen is invalid as soon as freopen is called. */
+
+FILE *freopen(const char *filename, const char *mode, FILE *f)
+{
+	int fl;
+	FILE *f2;
+
+	fflush(f);
+
+	if (!filename) {
+		f2 = fopen("/dev/null", mode);
+		if (!f2) goto fail;
+		fl = __syscall_fcntl(f2->fd, F_GETFL, 0);
+		if (fl < 0 || __syscall_fcntl(f->fd, F_SETFL, fl) < 0)
+			goto fail2;
+	} else {
+		f2 = fopen(filename, mode);
+		if (!f2) goto fail;
+		if (__syscall_dup2(f2->fd, f->fd) < 0)
+			goto fail2;
+	}
+
+	f->flags = (f->flags & F_PERM) | f2->flags;
+	f->read = f2->read;
+	f->write = f2->write;
+	f->seek = f2->seek;
+	f->close = f2->close;
+	f->flush = f2->flush;
+
+	fclose(f2);
+	return f;
+
+fail2:
+	fclose(f2);
+fail:
+	fclose(f);
+	return NULL;
+}
+
+LFS64(freopen);
diff --git a/src/stdio/fscanf.c b/src/stdio/fscanf.c
new file mode 100644
index 0000000..51fc9b3
--- /dev/null
+++ b/src/stdio/fscanf.c
@@ -0,0 +1,12 @@
+#include <stdio.h>
+#include <stdarg.h>
+
+int fscanf(FILE *f, const char *fmt, ...)
+{
+	int ret;
+	va_list ap;
+	va_start(ap, fmt);
+	ret = vfscanf(f, fmt, ap);
+	va_end(ap);
+	return ret;
+}
diff --git a/src/stdio/fseek.c b/src/stdio/fseek.c
new file mode 100644
index 0000000..bfaad37
--- /dev/null
+++ b/src/stdio/fseek.c
@@ -0,0 +1,38 @@
+#include "stdio_impl.h"
+
+int __fseeko_unlocked(FILE *f, off_t off, int whence)
+{
+	/* Adjust relative offset for unread data in buffer, if any. */
+	if (whence == SEEK_CUR) off -= f->rend - f->rpos;
+
+	/* If writing, flush output. */
+	if (f->wpos > f->buf && __oflow(f)) return -1;
+
+	/* Perform the underlying seek operation. */
+	if (f->seek(f, off, whence) < 0) return -1;
+
+	/* If seek succeeded, file is seekable and we discard read buffer. */
+	f->rpos = f->rend = f->rstop = 0;
+	f->flags &= ~F_EOF;
+	
+	FUNLOCK(f);	
+	return 0;
+}
+
+int __fseeko(FILE *f, off_t off, int whence)
+{
+	int result;
+	FLOCK(f);
+	result = __fseeko_unlocked(f, off, whence);
+	FUNLOCK(f);
+	return result;
+}
+
+int fseek(FILE *f, long off, int whence)
+{
+	return __fseeko(f, off, whence);
+}
+
+weak_alias(__fseeko, fseeko);
+
+LFS64(fseeko);
diff --git a/src/stdio/fsetpos.c b/src/stdio/fsetpos.c
new file mode 100644
index 0000000..5d76c8c
--- /dev/null
+++ b/src/stdio/fsetpos.c
@@ -0,0 +1,8 @@
+#include "stdio_impl.h"
+
+int fsetpos(FILE *f, const fpos_t *pos)
+{
+	return __fseeko(f, *(const off_t *)pos, SEEK_SET);
+}
+
+LFS64(fsetpos);
diff --git a/src/stdio/ftell.c b/src/stdio/ftell.c
new file mode 100644
index 0000000..aa1f538
--- /dev/null
+++ b/src/stdio/ftell.c
@@ -0,0 +1,35 @@
+#include "stdio_impl.h"
+
+off_t __ftello_unlocked(FILE *f)
+{
+	off_t pos = f->seek(f, 0, SEEK_CUR);
+	if (pos < 0) {
+		FUNLOCK(f);
+		return pos;
+	}
+	/* Adjust for data in buffer. */
+	return pos - (f->rend - f->rpos) + (f->wpos - f->wbase);
+}
+
+off_t __ftello(FILE *f)
+{
+	off_t pos;
+	FLOCK(f);
+	pos = __ftello_unlocked(f);
+	FUNLOCK(f);
+	return pos;
+}
+
+long ftell(FILE *f)
+{
+	off_t pos = __ftello(f);
+	if (pos > LONG_MAX) {
+		errno = EOVERFLOW;
+		return -1;
+	}
+	return pos;
+}
+
+weak_alias(__ftello, ftello);
+
+LFS64(ftello);
diff --git a/src/stdio/fwide.c b/src/stdio/fwide.c
new file mode 100644
index 0000000..f4da47f
--- /dev/null
+++ b/src/stdio/fwide.c
@@ -0,0 +1,10 @@
+#include "stdio_impl.h"
+
+#define SH (8*sizeof(int)-1)
+#define NORMALIZE(x) ((x)>>SH | -((-(x))>>SH))
+
+int fwide(FILE *f, int mode)
+{
+	if (!f->mode) f->mode = NORMALIZE(mode);
+	return f->mode;
+}
diff --git a/src/stdio/fwrite.c b/src/stdio/fwrite.c
new file mode 100644
index 0000000..23974fe
--- /dev/null
+++ b/src/stdio/fwrite.c
@@ -0,0 +1,51 @@
+#include "stdio_impl.h"
+
+size_t __fwritex(const unsigned char *s, size_t l, FILE *f)
+{
+	size_t i = 0;
+	size_t k = f->wend - f->wpos;
+
+	/* Handle line-buffered mode by breaking into 2 parts */
+	if (f->lbf >= 0) {
+		/* Match /^(.*\n|)/ */
+		for (i=l; i && s[i-1] != '\n'; i--);
+		if (i) {
+			f->lbf = EOF;
+			__fwritex(s, i, f);
+			f->lbf = '\n';
+			__oflow(f);
+			return ferror(f) ? 0 : i + __fwritex(s+i, l-i, f);
+		}
+	}
+
+	/* Buffer initial segment */
+	if (k > l) k = l;
+	memcpy(f->wpos, s, k);
+	f->wpos += k;
+	if (f->wpos < f->wend) return l;
+
+	/* If there's work left to do, flush buffer */
+	__oflow(f);
+	if (ferror(f)) return 0;
+
+	/* If the remainder will not fit in buffer, write it directly */
+	if (l - k >= f->wend - f->wpos)
+		return k + f->write(f, s+k, l-k);
+
+	/* Otherwise, buffer the remainder */
+	memcpy(f->wpos, s+k, l-k);
+	f->wpos += l-k;
+	return l;
+}
+
+size_t fwrite(const void *src, size_t size, size_t nmemb, FILE *f)
+{
+	size_t l = size*nmemb;
+	if (!l) return l;
+	FLOCK(f);
+	l = __fwritex(src, l, f);
+	FUNLOCK(f);
+	return l/size;
+}
+
+weak_alias(fwrite, fwrite_unlocked);
diff --git a/src/stdio/fwscanf.c b/src/stdio/fwscanf.c
new file mode 100644
index 0000000..a6892cf
--- /dev/null
+++ b/src/stdio/fwscanf.c
@@ -0,0 +1,13 @@
+#include <stdio.h>
+#include <stdarg.h>
+#include <wchar.h>
+
+int fwscanf(FILE *f, const wchar_t *fmt, ...)
+{
+	int ret;
+	va_list ap;
+	va_start(ap, fmt);
+	ret = vfwscanf(f, fmt, ap);
+	va_end(ap);
+	return ret;
+}
diff --git a/src/stdio/getc.c b/src/stdio/getc.c
new file mode 100644
index 0000000..b739b0a
--- /dev/null
+++ b/src/stdio/getc.c
@@ -0,0 +1,6 @@
+#include "stdio_impl.h"
+
+int getc(FILE *f)
+{
+	return fgetc(f);
+}
diff --git a/src/stdio/getc_unlocked.c b/src/stdio/getc_unlocked.c
new file mode 100644
index 0000000..629223e
--- /dev/null
+++ b/src/stdio/getc_unlocked.c
@@ -0,0 +1,8 @@
+#include "stdio_impl.h"
+
+int getc_unlocked(FILE *f)
+{
+	return f->rpos < f->rstop ? *f->rpos++ : __uflow(f);
+}
+
+weak_alias (getc_unlocked, fgetc_unlocked);
diff --git a/src/stdio/getchar.c b/src/stdio/getchar.c
new file mode 100644
index 0000000..c101265
--- /dev/null
+++ b/src/stdio/getchar.c
@@ -0,0 +1,6 @@
+#include <stdio.h>
+
+int getchar(void)
+{
+	return fgetc(stdin);
+}
diff --git a/src/stdio/getchar_unlocked.c b/src/stdio/getchar_unlocked.c
new file mode 100644
index 0000000..299cb95
--- /dev/null
+++ b/src/stdio/getchar_unlocked.c
@@ -0,0 +1,6 @@
+#include "stdio_impl.h"
+
+int getchar_unlocked(void)
+{
+	return stdin->rpos < stdin->rstop ? *stdin->rpos++ : __uflow(stdin);
+}
diff --git a/src/stdio/getdelim.c b/src/stdio/getdelim.c
new file mode 100644
index 0000000..f770d20
--- /dev/null
+++ b/src/stdio/getdelim.c
@@ -0,0 +1,59 @@
+#include "stdio_impl.h"
+
+#define MIN(a,b) ((a)<(b) ? (a) : (b))
+
+ssize_t getdelim(char **s, size_t *n, int delim, FILE *f)
+{
+	char *tmp;
+	unsigned char *z;
+	size_t k;
+	size_t i=0;
+
+	if (!n || !s) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	if (!*s) *n=0;
+
+	FLOCK(f);
+
+	while (!feof(f)) {
+		z = memchr(f->rpos, delim, f->rend - f->rpos);
+		k = z ? z - f->rpos + 1 : f->rend - f->rpos;
+		if (i+k >= *n) {
+			if (k >= SIZE_MAX-i) goto oom;
+			*n = i+k+1;
+			if (*n < SIZE_MAX/2) *n *= 2;
+			tmp = realloc(*s, *n);
+			if (!tmp) {
+				*n = i+k+1;
+				tmp = realloc(*s, *n);
+				if (!tmp) goto oom;
+			}
+			*s = tmp;
+		}
+		memcpy(*s+i, f->rpos, k);
+		f->rpos += k;
+		i += k;
+		if (z) break;
+		__underflow(f);
+	}
+	(*s)[i] = 0;
+	if (feof(f) || ferror(f)) {
+		FUNLOCK(f);
+		return -1;
+	}
+
+	FUNLOCK(f);
+
+	if (i > SSIZE_MAX) {
+		errno = EOVERFLOW;
+		return -1;
+	}
+
+	return i;
+oom:
+	errno = ENOMEM;
+	return -1;
+}
diff --git a/src/stdio/getline.c b/src/stdio/getline.c
new file mode 100644
index 0000000..a3a6651
--- /dev/null
+++ b/src/stdio/getline.c
@@ -0,0 +1,6 @@
+#include <stdio.h>
+
+ssize_t getline(char **s, size_t *n, FILE *f)
+{
+	return getdelim(s, n, '\n', f);
+}
diff --git a/src/stdio/gets.c b/src/stdio/gets.c
new file mode 100644
index 0000000..24319eb
--- /dev/null
+++ b/src/stdio/gets.c
@@ -0,0 +1,8 @@
+#include "stdio_impl.h"
+
+char *gets(char *s)
+{
+	char *ret = fgets(s, INT_MAX, stdin);
+	if (ret && s[strlen(s)-1] == '\n') s[strlen(s)-1] = 0;
+	return ret;
+}
diff --git a/src/stdio/getw.c b/src/stdio/getw.c
new file mode 100644
index 0000000..de9e985
--- /dev/null
+++ b/src/stdio/getw.c
@@ -0,0 +1,7 @@
+#include <stdio.h>
+
+int getw(FILE *f)
+{
+	int x;
+	return fread(&x, sizeof x, 1, f) ? x : EOF;
+}
diff --git a/src/stdio/getwc.c b/src/stdio/getwc.c
new file mode 100644
index 0000000..a2818bc
--- /dev/null
+++ b/src/stdio/getwc.c
@@ -0,0 +1,6 @@
+#include "stdio_impl.h"
+
+wint_t getwc(FILE *f)
+{
+	return fgetwc(f);
+}
diff --git a/src/stdio/getwchar.c b/src/stdio/getwchar.c
new file mode 100644
index 0000000..2295bd4
--- /dev/null
+++ b/src/stdio/getwchar.c
@@ -0,0 +1,8 @@
+#include "stdio_impl.h"
+
+wint_t getwchar(void)
+{
+	return fgetwc(stdin);
+}
+
+weak_alias(getwchar, getwchar_unlocked);
diff --git a/src/stdio/pclose.c b/src/stdio/pclose.c
new file mode 100644
index 0000000..c2fe7a2
--- /dev/null
+++ b/src/stdio/pclose.c
@@ -0,0 +1,10 @@
+#include "stdio_impl.h"
+
+int pclose(FILE *f)
+{
+	int status;
+	fclose(f);
+	while (waitpid(f->pipe_pid, &status, 0) == -1)
+		if (errno != EINTR) return -1;
+	return status;
+}
diff --git a/src/stdio/perror.c b/src/stdio/perror.c
new file mode 100644
index 0000000..e4637c8
--- /dev/null
+++ b/src/stdio/perror.c
@@ -0,0 +1,27 @@
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include "stdio_impl.h"
+
+void perror(const char *msg)
+{
+#if 1
+	if (msg) fprintf(stderr, "%s: %m\n", msg, strerror(errno));
+	else fprintf(stderr, "%m\n");
+#else
+	FILE *f = stderr;
+	char *errstr = strerror(errno);
+
+	FLOCK(f);
+	
+	if (msg) {
+		__fwritex(msg, strlen(msg), f);
+		__putc_unlocked(':', f);
+		__putc_unlocked(' ', f);
+	}
+	__fwritex(errstr, strlen(errstr), f);
+	__putc_unlocked('\n', f);
+
+	FUNLOCK(f);
+#endif
+}
diff --git a/src/stdio/popen.c b/src/stdio/popen.c
new file mode 100644
index 0000000..1d33e9d
--- /dev/null
+++ b/src/stdio/popen.c
@@ -0,0 +1,43 @@
+#include "stdio_impl.h"
+
+FILE *popen(const char *cmd, const char *mode)
+{
+	int p[2];
+	int op;
+	pid_t pid;
+	FILE *f;
+	const char *modes = "rw", *mi = strchr(modes, *mode);
+
+	if (mi) {
+		op = mi-modes;
+	} else {
+		errno = EINVAL;
+		return 0;
+	}
+	
+	if (pipe(p)) return NULL;
+	f = fdopen(p[op], mode);
+	if (!f) {
+		close(p[0]);
+		close(p[1]);
+		return NULL;
+	}
+	
+	pid = fork();
+	switch (pid) {
+	case -1:
+		fclose(f);
+		close(p[0]);
+		close(p[1]);
+		return NULL;
+	case 0:
+		dup2(p[1-op], 1-op);
+		close(p[0]);
+		close(p[1]);
+		execl("/bin/sh", "sh", "-c", cmd, (char *)0);
+		_exit(127);
+	}
+	close(p[1-op]);
+	f->pipe_pid = pid;
+	return f;
+}
diff --git a/src/stdio/printf.c b/src/stdio/printf.c
new file mode 100644
index 0000000..efeb8b3
--- /dev/null
+++ b/src/stdio/printf.c
@@ -0,0 +1,12 @@
+#include <stdio.h>
+#include <stdarg.h>
+
+int printf(const char *fmt, ...)
+{
+	int ret;
+	va_list ap;
+	va_start(ap, fmt);
+	ret = vprintf(fmt, ap);
+	va_end(ap);
+	return ret;
+}
diff --git a/src/stdio/putc.c b/src/stdio/putc.c
new file mode 100644
index 0000000..3c9dc11
--- /dev/null
+++ b/src/stdio/putc.c
@@ -0,0 +1,8 @@
+#include "stdio_impl.h"
+
+int putc(int c, FILE *f)
+{
+	return fputc(c, f);
+}
+
+weak_alias(putc, _IO_putc);
diff --git a/src/stdio/putc_unlocked.c b/src/stdio/putc_unlocked.c
new file mode 100644
index 0000000..f01da71
--- /dev/null
+++ b/src/stdio/putc_unlocked.c
@@ -0,0 +1,8 @@
+#include "stdio_impl.h"
+
+int putc_unlocked(int c, FILE *f)
+{
+	return f->wpos < f->wstop ? (*f->wpos++ = c) : __overflow(f, c);
+}
+
+weak_alias(putc_unlocked, fputc_unlocked);
diff --git a/src/stdio/putchar.c b/src/stdio/putchar.c
new file mode 100644
index 0000000..945636d
--- /dev/null
+++ b/src/stdio/putchar.c
@@ -0,0 +1,6 @@
+#include <stdio.h>
+
+int putchar(int c)
+{
+	return fputc(c, stdout);
+}
diff --git a/src/stdio/putchar_unlocked.c b/src/stdio/putchar_unlocked.c
new file mode 100644
index 0000000..72d47d1
--- /dev/null
+++ b/src/stdio/putchar_unlocked.c
@@ -0,0 +1,7 @@
+#include "stdio_impl.h"
+
+int putchar_unlocked(int c)
+{
+	return stdout->wpos < stdout->wstop ?
+		(*stdout->wpos++ = c) : __overflow(stdout, c);
+}
diff --git a/src/stdio/puts.c b/src/stdio/puts.c
new file mode 100644
index 0000000..eb70efd
--- /dev/null
+++ b/src/stdio/puts.c
@@ -0,0 +1,6 @@
+#include "stdio_impl.h"
+
+int puts(const char *s)
+{
+	return -(fputs(s, stdout) < 0 || putchar('\n') < 0);
+}
diff --git a/src/stdio/putw.c b/src/stdio/putw.c
new file mode 100644
index 0000000..137832e
--- /dev/null
+++ b/src/stdio/putw.c
@@ -0,0 +1,6 @@
+#include <stdio.h>
+
+int putw(int x, FILE *f)
+{
+	return fwrite(&x, sizeof x, 1, f) ? x : EOF;
+}
diff --git a/src/stdio/putwc.c b/src/stdio/putwc.c
new file mode 100644
index 0000000..80b54a4
--- /dev/null
+++ b/src/stdio/putwc.c
@@ -0,0 +1,6 @@
+#include "stdio_impl.h"
+
+wint_t putwc(wchar_t c, FILE *f)
+{
+	return fputwc(c, f);
+}
diff --git a/src/stdio/putwchar.c b/src/stdio/putwchar.c
new file mode 100644
index 0000000..3aacc1c
--- /dev/null
+++ b/src/stdio/putwchar.c
@@ -0,0 +1,8 @@
+#include "stdio_impl.h"
+
+wint_t putwchar(wchar_t c)
+{
+	return fputwc(c, stdout);
+}
+
+weak_alias(putwchar, putwchar_unlocked);
diff --git a/src/stdio/remove.c b/src/stdio/remove.c
new file mode 100644
index 0000000..8e33827
--- /dev/null
+++ b/src/stdio/remove.c
@@ -0,0 +1,7 @@
+#include <stdio.h>
+#include "syscall.h"
+
+int remove(const char *path)
+{
+	return __syscall_unlink(path);
+}
diff --git a/src/stdio/rename.c b/src/stdio/rename.c
new file mode 100644
index 0000000..4eced08
--- /dev/null
+++ b/src/stdio/rename.c
@@ -0,0 +1,7 @@
+#include <stdio.h>
+#include "syscall.h"
+
+int rename(const char *old, const char *new)
+{
+	return syscall2(__NR_rename, (long)old, (long)new);
+}
diff --git a/src/stdio/rewind.c b/src/stdio/rewind.c
new file mode 100644
index 0000000..7944b43
--- /dev/null
+++ b/src/stdio/rewind.c
@@ -0,0 +1,6 @@
+#include <stdio.h>
+
+void rewind(FILE *f)
+{
+	fseek(f, 0, SEEK_SET);
+}
diff --git a/src/stdio/scanf.c b/src/stdio/scanf.c
new file mode 100644
index 0000000..a04a440
--- /dev/null
+++ b/src/stdio/scanf.c
@@ -0,0 +1,12 @@
+#include <stdio.h>
+#include <stdarg.h>
+
+int scanf(const char *fmt, ...)
+{
+	int ret;
+	va_list ap;
+	va_start(ap, fmt);
+	ret = vscanf(fmt, ap);
+	va_end(ap);
+	return ret;
+}
diff --git a/src/stdio/setbuf.c b/src/stdio/setbuf.c
new file mode 100644
index 0000000..205afcf
--- /dev/null
+++ b/src/stdio/setbuf.c
@@ -0,0 +1,6 @@
+#include "stdio_impl.h"
+
+void setbuf(FILE *f, char *buf)
+{
+	setvbuf(f, buf, buf ? _IOFBF : _IONBF, BUFSIZ);
+}
diff --git a/src/stdio/setvbuf.c b/src/stdio/setvbuf.c
new file mode 100644
index 0000000..2985d3f
--- /dev/null
+++ b/src/stdio/setvbuf.c
@@ -0,0 +1,22 @@
+#include "stdio_impl.h"
+
+/* This function makes no attempt to protect the user from his/her own
+ * stupidity. If called any time but when then ISO C standard specifically
+ * allows it, all hell can and will break loose, especially with threads!
+ *
+ * This implementation ignores all arguments except the buffering type,
+ * and uses the existing buffer allocated alongside the FILE object.
+ * In the case of stderr where the preexisting buffer is length 1, it
+ * is not possible to set line buffering or full buffering. */
+
+int setvbuf(FILE *f, char *buf, int type, size_t size)
+{
+	f->lbf = EOF;
+
+	if (type == _IONBF)
+		f->buf_size = 1;
+	else if (type == _IOLBF)
+		f->lbf = '\n';
+
+	return 0;
+}
diff --git a/src/stdio/snprintf.c b/src/stdio/snprintf.c
new file mode 100644
index 0000000..4071c2f
--- /dev/null
+++ b/src/stdio/snprintf.c
@@ -0,0 +1,13 @@
+#include <stdio.h>
+#include <stdarg.h>
+
+int snprintf(char *s, size_t n, const char *fmt, ...)
+{
+	int ret;
+	va_list ap;
+	va_start(ap, fmt);
+	ret = vsnprintf(s, n, fmt, ap);
+	va_end(ap);
+	return ret;
+}
+
diff --git a/src/stdio/sprintf.c b/src/stdio/sprintf.c
new file mode 100644
index 0000000..6b22540
--- /dev/null
+++ b/src/stdio/sprintf.c
@@ -0,0 +1,12 @@
+#include <stdio.h>
+#include <stdarg.h>
+
+int sprintf(char *s, const char *fmt, ...)
+{
+	int ret;
+	va_list ap;
+	va_start(ap, fmt);
+	ret = vsprintf(s, fmt, ap);
+	va_end(ap);
+	return ret;
+}
diff --git a/src/stdio/sscanf.c b/src/stdio/sscanf.c
new file mode 100644
index 0000000..a1cea69
--- /dev/null
+++ b/src/stdio/sscanf.c
@@ -0,0 +1,12 @@
+#include <stdio.h>
+#include <stdarg.h>
+
+int sscanf(const char *s, const char *fmt, ...)
+{
+	int ret;
+	va_list ap;
+	va_start(ap, fmt);
+	ret = vsscanf(s, fmt, ap);
+	va_end(ap);
+	return ret;
+}
diff --git a/src/stdio/stderr.c b/src/stdio/stderr.c
new file mode 100644
index 0000000..4a79d4e
--- /dev/null
+++ b/src/stdio/stderr.c
@@ -0,0 +1,13 @@
+#include "stdio_impl.h"
+
+static unsigned char buf[1+UNGET];
+static FILE f = {
+	.buf = buf+UNGET,
+	.buf_size = 1,
+	.fd = 2,
+	.flags = F_PERM | F_NORD,
+	.write = __stdio_write,
+	.seek = __stdio_seek,
+	.close = __stdio_close,
+};
+FILE *const stderr = &f;
diff --git a/src/stdio/stdin.c b/src/stdio/stdin.c
new file mode 100644
index 0000000..51c9923
--- /dev/null
+++ b/src/stdio/stdin.c
@@ -0,0 +1,13 @@
+#include "stdio_impl.h"
+
+static unsigned char buf[BUFSIZ+UNGET];
+static FILE f = {
+	.buf = buf+UNGET,
+	.buf_size = sizeof buf-UNGET,
+	.fd = 0,
+	.flags = F_PERM | F_NOWR,
+	.read = __stdio_read,
+	.seek = __stdio_seek,
+	.close = __stdio_close,
+};
+FILE *const stdin = &f;
diff --git a/src/stdio/stdout.c b/src/stdio/stdout.c
new file mode 100644
index 0000000..bf6eea6
--- /dev/null
+++ b/src/stdio/stdout.c
@@ -0,0 +1,17 @@
+#include "stdio_impl.h"
+
+static unsigned char buf[BUFSIZ+UNGET];
+static FILE f = {
+	.buf = buf+UNGET,
+	.buf_size = sizeof buf-UNGET,
+	.fd = 1,
+	.flags = F_PERM | F_NORD,
+	.lbf = '\n',
+	.write = __stdio_write,
+	.seek = __stdio_seek,
+	.close = __stdio_close,
+};
+FILE *const stdout = &f;
+
+/* overrides symbol in fflush.c, used for flushing NULL */
+FILE *const __stdout_to_flush = &f;
diff --git a/src/stdio/swscanf.c b/src/stdio/swscanf.c
new file mode 100644
index 0000000..b66ad03
--- /dev/null
+++ b/src/stdio/swscanf.c
@@ -0,0 +1,13 @@
+#include <stdio.h>
+#include <stdarg.h>
+#include <wchar.h>
+
+int swscanf(const wchar_t *s, const wchar_t *fmt, ...)
+{
+	int ret;
+	va_list ap;
+	va_start(ap, fmt);
+	ret = vswscanf(s, fmt, ap);
+	va_end(ap);
+	return ret;
+}
diff --git a/src/stdio/tempnam.c b/src/stdio/tempnam.c
new file mode 100644
index 0000000..2cbcb86
--- /dev/null
+++ b/src/stdio/tempnam.c
@@ -0,0 +1,42 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <limits.h>
+#include <errno.h>
+#include "libc.h"
+
+char *tempnam(const char *dir, const char *pfx)
+{
+	static int lock;
+	static int index;
+	char *s;
+	int pid = getpid();
+	int l;
+
+	if (!dir) dir = P_tmpdir;
+	if (!pfx) pfx = "temp";
+
+	if (access(dir, R_OK|W_OK|X_OK) != 0)
+		return NULL;
+
+	l = strlen(dir) + 1 + strlen(pfx) + 2 + sizeof(int)*3*2 + 1;
+	s = malloc(l);
+	if (!s) {
+		errno = ENOMEM;
+		return NULL;
+	}
+
+	LOCK(&lock);
+	for (; index < TMP_MAX; index++) {
+		snprintf(s, l, "%s/%s-%d-%d", dir, pfx, pid, index);
+		if (access(s, F_OK) != 0) {
+			UNLOCK(&lock);
+			return s;
+		}
+	}
+	UNLOCK(&lock);
+	free(s);
+	return NULL;	
+}
diff --git a/src/stdio/tmpfile.c b/src/stdio/tmpfile.c
new file mode 100644
index 0000000..185025f
--- /dev/null
+++ b/src/stdio/tmpfile.c
@@ -0,0 +1,23 @@
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include "stdio_impl.h"
+
+FILE *tmpfile(void)
+{
+	char buf[L_tmpnam], *s;
+	int fd;
+	FILE *f;
+	for (;;) {
+		s = tmpnam(buf);
+		if (!s) return NULL;
+		fd = __syscall_open(s, O_RDWR | O_CREAT | O_EXCL, 0600);
+		if (fd >= 0) {
+			f = __fdopen(fd, "w+");
+			remove(s);
+			return f;
+		}
+	}
+}
+
+LFS64(tmpfile);
diff --git a/src/stdio/tmpnam.c b/src/stdio/tmpnam.c
new file mode 100644
index 0000000..14d5922
--- /dev/null
+++ b/src/stdio/tmpnam.c
@@ -0,0 +1,38 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+#include <unistd.h>
+#include "libc.h"
+
+char *tmpnam(char *s)
+{
+	static int lock;
+	static int index;
+	static char *s2;
+	int pid = getpid();
+	char *dir = getenv("TMPDIR");
+
+	if (!s) {
+		if (!s2) s2 = malloc(L_tmpnam);
+		s = s2;
+	}
+
+	/* this interface is insecure anyway but at least we can try.. */
+	if (!dir || strlen(dir) > L_tmpnam-32)
+		dir = P_tmpdir;
+
+	if (access(dir, R_OK|W_OK|X_OK) != 0)
+		return NULL;
+
+	LOCK(&lock);
+	for (index++; index < TMP_MAX; index++) {
+		snprintf(s, L_tmpnam, "%s/temp%d-%d", dir, pid, index);
+		if (access(s, F_OK) != 0) {
+			UNLOCK(&lock);
+			return s;
+		}
+	}
+	UNLOCK(&lock);
+	return NULL;
+}
diff --git a/src/stdio/ungetc.c b/src/stdio/ungetc.c
new file mode 100644
index 0000000..0718168
--- /dev/null
+++ b/src/stdio/ungetc.c
@@ -0,0 +1,33 @@
+#include "stdio_impl.h"
+
+int ungetc(int c, FILE *f)
+{
+	if (c == EOF) return c;
+
+	FLOCK(f);
+
+	/* Fail if unreadable or writing and unable to flush */
+	if ((f->flags & (F_ERR|F_NORD)) || (f->wpos && __oflow(f))) {
+		FUNLOCK(f);
+		return EOF;
+	}
+
+	/* Clear write mode */
+	f->wbase = f->wpos = f->wstop = f->wend = 0;
+
+	/* Put the file in read mode */
+	if (!f->rpos) f->rpos = f->rend = f->buf;
+
+	/* If unget buffer is already full, fail. */
+	if (f->rpos <= f->buf - UNGET) {
+		FUNLOCK(f);
+		return EOF;
+	}
+
+	/* Put a byte back into the buffer */
+	*--f->rpos = c;
+	f->flags &= ~F_EOF;
+
+	FUNLOCK(f);
+	return c;
+}
diff --git a/src/stdio/ungetwc.c b/src/stdio/ungetwc.c
new file mode 100644
index 0000000..f7cde2e
--- /dev/null
+++ b/src/stdio/ungetwc.c
@@ -0,0 +1,45 @@
+#include "stdio_impl.h"
+
+wint_t ungetwc(wint_t c, FILE *f)
+{
+	unsigned char mbc[MB_LEN_MAX];
+	int l=1;
+
+	if (c == WEOF) return c;
+
+	/* Try conversion early so we can fail without locking if invalid */
+	if (!isascii(c) && (l = wctomb(mbc, c)) < 0)
+		return WEOF;
+
+	FLOCK(f);
+
+	f->mode |= f->mode+1;
+
+	/* Fail if unreadable or writing and unable to flush */
+	if ((f->flags & (F_ERR|F_NORD)) || (f->wpos && __oflow(f))) {
+		FUNLOCK(f);
+		return EOF;
+	}
+
+	/* Clear write mode */
+	f->wpos = f->wstop = f->wend = 0;
+
+	/* Put the file in read mode */
+	if (!f->rpos) f->rpos = f->rend = f->buf;
+
+	/* If unget buffer is nonempty, fail. */
+	if (f->rpos < f->buf) {
+		FUNLOCK(f);
+		return WEOF;
+	}
+
+	/* Put character back into the buffer */
+	if (isascii(c)) *--f->rpos = c;
+	else memcpy(f->rpos -= l, mbc, l);
+
+	/* Clear EOF */
+	f->flags &= ~F_EOF;
+
+	FUNLOCK(f);
+	return c;
+}
diff --git a/src/stdio/vasprintf.c b/src/stdio/vasprintf.c
new file mode 100644
index 0000000..f2bbc7a
--- /dev/null
+++ b/src/stdio/vasprintf.c
@@ -0,0 +1,27 @@
+#include <stdio.h>
+#include <stdarg.h>
+#include <stdlib.h>
+
+#define GUESS 240U
+
+int vasprintf(char **s, const char *fmt, va_list ap)
+{
+	va_list ap2;
+	char *a;
+	int l=GUESS;
+
+	if (!(a=malloc(GUESS))) return -1;
+
+	va_copy(ap2, ap);
+	l=vsnprintf(a, GUESS, fmt, ap2);
+	va_end(ap2);
+
+	if (l<GUESS) {
+		char *b = realloc(a, l+1U);
+		*s = b ? b : a;
+		return l;
+	}
+	free(a);
+	if (l<0 || !(*s=malloc(l+1U))) return -1;
+	return vsnprintf(*s, l+1U, fmt, ap);
+}
diff --git a/src/stdio/vdprintf.c b/src/stdio/vdprintf.c
new file mode 100644
index 0000000..bfb1b0a
--- /dev/null
+++ b/src/stdio/vdprintf.c
@@ -0,0 +1,14 @@
+#include "stdio_impl.h"
+
+int vdprintf(int fd, const char *fmt, va_list ap)
+{
+	int r;
+	char buf[BUFSIZ];
+	FILE f = {
+		.fd = fd, .lbf = EOF, .write = __stdio_write,
+		.buf = buf+UNGET, .buf_size = sizeof buf - UNGET
+	};
+	r = vfprintf(&f, fmt, ap);
+	__oflow(&f);
+	return r;
+}
diff --git a/src/stdio/vfprintf.c b/src/stdio/vfprintf.c
new file mode 100644
index 0000000..5e19acc
--- /dev/null
+++ b/src/stdio/vfprintf.c
@@ -0,0 +1,640 @@
+#include "stdio_impl.h"
+
+/* Some useful macros */
+
+#define MAX(a,b) ((a)>(b) ? (a) : (b))
+#define MIN(a,b) ((a)<(b) ? (a) : (b))
+#define CONCAT2(x,y) x ## y
+#define CONCAT(x,y) CONCAT2(x,y)
+
+/* Convenient bit representation for modifier flags, which all fall
+ * within 31 codepoints of the space character. */
+
+#define ALT_FORM   (1U<<'#'-' ')
+#define ZERO_PAD   (1U<<'0'-' ')
+#define LEFT_ADJ   (1U<<'-'-' ')
+#define PAD_POS    (1U<<' '-' ')
+#define MARK_POS   (1U<<'+'-' ')
+#define GROUPED    (1U<<'\''-' ')
+
+#define FLAGMASK (ALT_FORM|ZERO_PAD|LEFT_ADJ|PAD_POS|MARK_POS|GROUPED)
+
+#if UINT_MAX == ULONG_MAX
+#define LONG_IS_INT
+#endif
+
+#if SIZE_MAX != ULONG_MAX || UINTMAX_MAX != ULLONG_MAX
+#define ODD_TYPES
+#endif
+
+/* State machine to accept length modifiers + conversion specifiers.
+ * Result is 0 on failure, or an argument type to pop on success. */
+
+enum {
+	BARE, LPRE, LLPRE, HPRE, HHPRE, BIGLPRE,
+	ZTPRE, JPRE,
+	STOP,
+	PTR, INT, UINT, ULLONG,
+#ifndef LONG_IS_INT
+	LONG, ULONG,
+#else
+#define LONG INT
+#define ULONG UINT
+#endif
+	SHORT, USHORT, CHAR, UCHAR,
+#ifdef ODD_TYPES
+	LLONG, SIZET, IMAX, UMAX, PDIFF, UIPTR,
+#else
+#define LLONG ULLONG
+#define SIZET ULONG
+#define IMAX LLONG
+#define UMAX ULLONG
+#define PDIFF LONG
+#define UIPTR ULONG
+#endif
+	DBL, LDBL,
+	NOARG,
+	MAXSTATE
+};
+
+#define S(x) [(x)-'A']
+
+static const unsigned char states[]['z'-'A'+1] = {
+	{ /* 0: bare types */
+		S('d') = INT, S('i') = INT,
+		S('o') = UINT, S('u') = UINT, S('x') = UINT, S('X') = UINT,
+		S('e') = DBL, S('f') = DBL, S('g') = DBL, S('a') = DBL,
+		S('E') = DBL, S('F') = DBL, S('G') = DBL, S('A') = DBL,
+		S('c') = CHAR, S('C') = INT,
+		S('s') = PTR, S('S') = PTR, S('p') = UIPTR, S('n') = PTR,
+		S('m') = NOARG,
+		S('l') = LPRE, S('h') = HPRE, S('L') = BIGLPRE,
+		S('z') = ZTPRE, S('j') = JPRE, S('t') = ZTPRE,
+	}, { /* 1: l-prefixed */
+		S('d') = LONG, S('i') = LONG,
+		S('o') = ULONG, S('u') = ULONG, S('x') = ULONG, S('X') = ULONG,
+		S('c') = INT, S('s') = PTR, S('n') = PTR,
+		S('l') = LLPRE,
+	}, { /* 2: ll-prefixed */
+		S('d') = LLONG, S('i') = LLONG,
+		S('o') = ULLONG, S('u') = ULLONG,
+		S('x') = ULLONG, S('X') = ULLONG,
+		S('n') = PTR,
+	}, { /* 3: h-prefixed */
+		S('d') = SHORT, S('i') = SHORT,
+		S('o') = USHORT, S('u') = USHORT,
+		S('x') = USHORT, S('X') = USHORT,
+		S('n') = PTR,
+		S('h') = HHPRE,
+	}, { /* 4: hh-prefixed */
+		S('d') = CHAR, S('i') = CHAR,
+		S('o') = UCHAR, S('u') = UCHAR,
+		S('x') = UCHAR, S('X') = UCHAR,
+		S('n') = PTR,
+	}, { /* 5: L-prefixed */
+		S('e') = LDBL, S('f') = LDBL, S('g') = LDBL, S('a') = LDBL,
+		S('E') = LDBL, S('F') = LDBL, S('G') = LDBL, S('A') = LDBL,
+		S('n') = PTR,
+	}, { /* 6: z- or t-prefixed (assumed to be same size) */
+		S('d') = PDIFF, S('i') = PDIFF,
+		S('o') = SIZET, S('u') = SIZET,
+		S('x') = SIZET, S('X') = SIZET,
+		S('n') = PTR,
+	}, { /* 7: j-prefixed */
+		S('d') = IMAX, S('i') = IMAX,
+		S('o') = UMAX, S('u') = UMAX,
+		S('x') = UMAX, S('X') = UMAX,
+		S('n') = PTR,
+	}
+};
+
+#define OOB(x) ((unsigned)(x)-'A' > 'z'-'A')
+
+union arg
+{
+	uintmax_t i;
+	long double f;
+	void *p;
+};
+
+static void pop_arg(union arg *arg, int type, va_list *ap)
+{
+	/* Give the compiler a hint for optimizing the switch. */
+	if ((unsigned)type > MAXSTATE) return;
+	switch (type) {
+	       case PTR:	arg->p = va_arg(*ap, void *);
+	break; case INT:	arg->i = va_arg(*ap, int);
+	break; case UINT:	arg->i = va_arg(*ap, unsigned int);
+#ifndef LONG_IS_INT
+	break; case LONG:	arg->i = va_arg(*ap, long);
+	break; case ULONG:	arg->i = va_arg(*ap, unsigned long);
+#endif
+	break; case ULLONG:	arg->i = va_arg(*ap, unsigned long long);
+	break; case SHORT:	arg->i = (short)va_arg(*ap, int);
+	break; case USHORT:	arg->i = (unsigned short)va_arg(*ap, int);
+	break; case CHAR:	arg->i = (signed char)va_arg(*ap, int);
+	break; case UCHAR:	arg->i = (unsigned char)va_arg(*ap, int);
+#ifdef ODD_TYPES
+	break; case LLONG:	arg->i = va_arg(*ap, long long);
+	break; case SIZET:	arg->i = va_arg(*ap, size_t);
+	break; case IMAX:	arg->i = va_arg(*ap, intmax_t);
+	break; case UMAX:	arg->i = va_arg(*ap, uintmax_t);
+	break; case PDIFF:	arg->i = va_arg(*ap, ptrdiff_t);
+	break; case UIPTR:	arg->i = (uintptr_t)va_arg(*ap, void *);
+#endif
+	break; case DBL:	arg->f = va_arg(*ap, double);
+	break; case LDBL:	arg->f = va_arg(*ap, long double);
+	}
+}
+
+static void out(FILE *f, const char *s, size_t l)
+{
+	__fwritex(s, l, f);
+}
+
+static void pad(FILE *f, char c, int w, int l, int fl)
+{
+	char pad[256];
+	if (fl & (LEFT_ADJ | ZERO_PAD) || l >= w) return;
+	l = w - l;
+	memset(pad, c, l>sizeof pad ? sizeof pad : l);
+	for (; l >= sizeof pad; l -= sizeof pad)
+		out(f, pad, sizeof pad);
+	out(f, pad, l);
+}
+
+static const char xdigits[16] = {
+	"0123456789ABCDEF"
+};
+
+static char *fmt_x(uintmax_t x, char *s, int lower)
+{
+	for (; x; x>>=4) *--s = xdigits[(x&15)]|lower;
+	return s;
+}
+
+static char *fmt_o(uintmax_t x, char *s)
+{
+	for (; x; x>>=3) *--s = '0' + (x&7);
+	return s;
+}
+
+static char *fmt_u(uintmax_t x, char *s)
+{
+	unsigned long y;
+	for (   ; x>ULONG_MAX; x/=10) *--s = '0' + x%10;
+	for (y=x;           y; y/=10) *--s = '0' + y%10;
+	return s;
+}
+
+static int fmt_fp(FILE *f, long double y, int w, int p, int fl, int t)
+{
+	uint32_t big[(LDBL_MAX_EXP+LDBL_MANT_DIG)/9+1];
+	uint32_t *a, *d, *r, *z;
+	int e2=0, e, i, j, l;
+	char buf[9+LDBL_MANT_DIG/4], *s;
+	const char *prefix="-+ ";
+	int pl;
+	char ebuf0[3*sizeof(int)], *ebuf=&ebuf0[3*sizeof(int)], *estr;
+
+	pl=1;
+	if (y<0 || 1/y<0) {
+		y=-y;
+	} else if (fl & MARK_POS) {
+		prefix++;
+	} else if (fl & PAD_POS) {
+		prefix+=2;
+	} else pl=0;
+
+	if (!isfinite(y)) {
+		char *s = (t&32)?"inf":"INF";
+		if (y!=y) s=(t&32)?"nan":"NAN", pl=0;
+		pad(f, ' ', w, 3+pl, fl&~ZERO_PAD);
+		out(f, prefix, pl);
+		out(f, s, 3);
+		pad(f, ' ', w, 3+pl, fl^LEFT_ADJ);
+		return MAX(w, 3+pl);
+	}
+
+	y = frexpl(y, &e2) * 2;
+	if (y) e2--;
+
+	if ((t|32)=='a') {
+		long double round = 8.0;
+		int re;
+
+		if (p<0 || p>=LDBL_MANT_DIG/4-1) re=0;
+		else re=LDBL_MANT_DIG/4-1-p;
+
+		if (re) {
+			if (pl && *prefix=='-') y=-y;
+			while (re--) round*=16;
+			y+=round;
+			y-=round;
+			if (y<0) y=-y;
+		}
+
+		estr=fmt_u(e2<0 ? -e2 : e2, ebuf);
+		if (estr==ebuf) *--estr='0';
+		*--estr = (e2<0 ? '-' : '+');
+		*--estr = t+('p'-'a');
+
+		s=buf;
+		*s++='0';
+		*s++=t+('x'-'a');
+		do {
+			int x=y;
+			*s++=xdigits[x]|(t&32);
+			y=16*(y-x);
+			if (s-buf==3 && (y||p>0||(fl&ALT_FORM))) *s++='.';
+		} while (y);
+
+		if (p<0) p = s-buf-4;
+		l = 1 + p + (p || (fl&ALT_FORM)) + ebuf-estr;
+
+		pad(f, ' ', w, pl+l, fl);
+		out(f, prefix, pl);
+		pad(f, '0', w, pl+l, fl^ZERO_PAD);
+		out(f, buf, s-buf);
+		pad(f, '0', l-(ebuf-estr)-(s-buf), 0, 0);
+		out(f, estr, ebuf-estr);
+		pad(f, '0', w, pl+l, fl^LEFT_ADJ);
+		return MAX(w, pl+l);
+	}
+	if (p<0) p=6;
+
+	y *= 0x1p28; e2-=28;
+
+	if (e2<0) a=r=z=big;
+	else a=r=z=big+sizeof(big)/sizeof(*big) - LDBL_MANT_DIG - 1;
+
+	do {
+		*z = y;
+		y = 1000000000*(y-*z++);
+	} while (y);
+
+	while (e2>0) {
+		uint32_t carry=0;
+		int sh=MIN(29,e2);
+		for (d=z-1; d>=a; d--) {
+			uint64_t x = ((uint64_t)*d<<sh)+carry;
+			*d = x % 1000000000;
+			carry = x / 1000000000;
+		}
+		if (!z[-1] && z>a) z--;
+		if (carry) *--a = carry;
+		e2-=sh;
+	}
+	while (e2<0) {
+		uint32_t carry=0, *z2;
+		int sh=MIN(9,-e2);
+		for (d=a; d<z; d++) {
+			uint32_t rm = *d & (1<<sh)-1;
+			*d = (*d>>sh) + carry;
+			carry = (1000000000>>sh) * rm;
+		}
+		if (!*a) a++;
+		if (carry) *z++ = carry;
+		/* Avoid (slow!) computation past requested precision */
+		z2 = ((t|32)=='f' ? r : a) + 2 + p/9;
+		z = MIN(z, z2);
+		e2+=sh;
+	}
+
+	if (a<z) for (i=10, e=9*(r-a); *a>=i; i*=10, e++);
+	else e=0;
+
+	/* Perform rounding: j is precision after the radix (possibly neg) */
+	j = p - ((t|32)!='f')*e - ((t|32)=='g');
+	if (j < 9*(z-r-1)) {
+		uint32_t x;
+		/* We avoid C's broken division of negative numbers */
+		d = r + 1 + (j+9*LDBL_MAX_EXP)/9 - LDBL_MAX_EXP;
+		j += 9*LDBL_MAX_EXP;
+		j %= 9;
+		for (i=10, j++; j<9; i*=10, j++);
+		x = *d % i;
+		/* Are there any significant digits past j? */
+		if (x || d+1!=z) {
+			long double round = CONCAT(0x1p,LDBL_MANT_DIG);
+			long double small;
+			if (x<i/2) small=0x01p-1;
+			else if (i==i/2 && d+1==z) small=0x10p-1;
+			else small=0x11p-1;
+			if (pl && *prefix=='-') round*=-1, small*=-1;
+			/* Decide whether to round by probing round+small */
+			if (round+small != round) {
+				*d = *d - x + i;
+				while (*d > 999999999) {
+					*d--=0;
+					(*d)++;
+				}
+				if (d<a) a=d;
+				for (i=10, e=9*(r-a); *a>=i; i*=10, e++);
+			}
+		}
+		for (; !z[-1] && z>a; z--);
+	}
+	
+	if ((t|32)=='g') {
+		if (!p) p++;
+		if (p>e && e>=-4) {
+			t--;
+			p-=e+1;
+		} else {
+			t-=2;
+			p--;
+		}
+		if (!(fl&ALT_FORM)) {
+			/* Count trailing zeros in last place */
+			if (z>a) for (i=10, j=0; z[-1]%i==0; i*=10, j++);
+			else j=9;
+			if ((t|32)=='f')
+				p = MIN(p,MAX(0,9*(z-r-1)-j));
+			else
+				p = MIN(p,MAX(0,9*(z-r-1)+e-j));
+		}
+	}
+	l = 1 + p + (p || (fl&ALT_FORM));
+	if ((t|32)=='f') {
+		if (e>0) l+=e;
+	} else {
+		estr=fmt_u(e<0 ? -e : e, ebuf);
+		while(ebuf-estr<2) *--estr='0';
+		*--estr = (e<0 ? '-' : '+');
+		*--estr = t;
+		l += ebuf-estr;
+	}
+
+	pad(f, ' ', w, pl+l, fl);
+	out(f, prefix, pl);
+	pad(f, '0', w, pl+l, fl^ZERO_PAD);
+
+	if ((t|32)=='f') {
+		if (a>r) a=r;
+		for (d=a; d<=r; d++) {
+			char *s = fmt_u(*d, buf+9);
+			if (d!=a) while (s>buf) *--s='0';
+			else if (s==buf+9) *--s='0';
+			out(f, s, buf+9-s);
+		}
+		if (p || (fl&ALT_FORM)) out(f, ".", 1);
+		for (; d<z && p>0; d++, p-=9) {
+			char *s = fmt_u(*d, buf+9);
+			while (s>buf) *--s='0';
+			out(f, s, MIN(9,p));
+		}
+		pad(f, '0', p+9, 9, 0);
+	} else {
+		if (z<=a) z=a+1;
+		for (d=a; d<z && p>=0; d++) {
+			char *s = fmt_u(*d, buf+9);
+			if (s==buf+9) *--s='0';
+			if (d!=a) while (s>buf) *--s='0';
+			else {
+				out(f, s++, 1);
+				if (p>0||(fl&ALT_FORM)) out(f, ".", 1);
+			}
+			out(f, s, MIN(buf+9-s, p));
+			p -= buf+9-s;
+		}
+		pad(f, '0', p+18, 18, 0);
+		out(f, estr, ebuf-estr);
+	}
+
+	pad(f, ' ', w, pl+l, fl^LEFT_ADJ);
+
+	return MAX(w, pl+l);
+}
+
+static int getint(char **s) {
+	int i;
+	for (i=0; isdigit(**s); (*s)++)
+		i = 10*i + (**s-'0');
+	return i;
+}
+
+static int printf_core(FILE *f, const char *fmt, va_list *ap, union arg *nl_arg, int *nl_type)
+{
+	char *a, *z, *s=(char *)fmt;
+	unsigned l10n=0, litpct, fl;
+	int w, p;
+	union arg arg;
+	int argpos;
+	unsigned st, ps;
+	int cnt=0, l=0;
+	int i;
+	char buf[sizeof(uintmax_t)*3+3+LDBL_MANT_DIG/4];
+	const char *prefix;
+	int t, pl;
+	wchar_t wc[2], *ws;
+	char mb[4];
+
+	for (;;) {
+		/* Update output count, end loop when fmt is exhausted */
+		if (cnt >= 0) {
+			if (l > INT_MAX - cnt) {
+				if (!ferror(f)) errno = EOVERFLOW;
+				cnt = -1;
+			} else cnt += l;
+		}
+		if (!*s) break;
+
+		/* Handle literal text and %% format specifiers */
+		for (a=s; *s && *s!='%'; s++);
+		litpct = strspn(s, "%")/2; /* Optimize %%%% runs */
+		z = s+litpct;
+		s += 2*litpct;
+		l = z-a;
+		if (f) out(f, a, l);
+		if (l) continue;
+
+		if (isdigit(s[1]) && s[2]=='$') {
+			l10n=1;
+			argpos = s[1]-'0';
+			s+=3;
+		} else {
+			argpos = -1;
+			s++;
+		}
+
+		/* Read modifier flags */
+		for (fl=0; (unsigned)*s-' '<32 && (FLAGMASK&(1U<<*s-' ')); s++)
+			fl |= 1U<<*s-' ';
+
+		/* Read field width */
+		if (*s=='*') {
+			if (isdigit(s[1]) && s[2]=='$') {
+				l10n=1;
+				nl_type[s[1]-'0'] = INT;
+				w = nl_arg[s[1]-'0'].i;
+				s+=3;
+			} else if (!l10n) {
+				w = f ? va_arg(*ap, int) : 0;
+				s++;
+			} else return -1;
+			if (w<0) fl|=LEFT_ADJ, w=-w;
+		} else if ((w=getint(&s))<0) return -1;
+
+		/* Read precision */
+		if (*s=='.' && s[1]=='*') {
+			if (isdigit(s[2]) && s[3]=='$') {
+				nl_type[s[2]-'0'] = INT;
+				p = nl_arg[s[2]-'0'].i;
+				s+=4;
+			} else if (!l10n) {
+				p = f ? va_arg(*ap, int) : 0;
+				s+=2;
+			} else return -1;
+		} else if (*s=='.') {
+			s++;
+			p = getint(&s);
+		} else p = -1;
+
+		/* Format specifier state machine */
+		st=0;
+		do {
+			if (OOB(*s)) return -1;
+			ps=st;
+			st=states[st]S(*s++);
+		} while (st-1<STOP);
+		if (!st) return -1;
+
+		/* Check validity of argument type (nl/normal) */
+		if (st==NOARG) {
+			if (argpos>=0) return -1;
+			else if (!f) continue;
+		} else {
+			if (argpos>=0) nl_type[argpos]=st, arg=nl_arg[argpos];
+			else if (f) pop_arg(&arg, st, ap);
+			else return 0;
+		}
+
+		if (!f) continue;
+
+		z = buf + sizeof(buf);
+		prefix = "-+   0X0x";
+		pl = 0;
+		t = s[-1];
+
+		/* Transform ls,lc -> S,C */
+		if (ps && (t&15)==3) t&=~32;
+
+		/* - and 0 flags are mutually exclusive */
+		if (fl & LEFT_ADJ) fl &= ~ZERO_PAD;
+
+		switch(t) {
+		case 'n':
+			switch(ps) {
+			case BARE: *(int *)arg.p = l;
+			case LPRE: *(long *)arg.p = l;
+			case LLPRE: *(long long *)arg.p = l;
+			case HPRE: *(unsigned short *)arg.p = l;
+			case HHPRE: *(unsigned char *)arg.p = l;
+			case ZTPRE: *(size_t *)arg.p = l;
+			case JPRE: *(uintmax_t *)arg.p = l;
+			}
+			continue;
+		case 'p':
+			p = MAX(p, 2*sizeof(void*));
+			t = 'x';
+			fl |= ALT_FORM;
+		case 'x': case 'X':
+			a = fmt_x(arg.i, z, t&32);
+			if (fl & ALT_FORM) prefix+=(t>>4), pl=2;
+			if (0) {
+		case 'o':
+			a = fmt_o(arg.i, z);
+			if ((fl&ALT_FORM) && arg.i) prefix+=5, pl=1;
+			} if (0) {
+		case 'd': case 'i':
+			pl=1;
+			if (arg.i>INTMAX_MAX) {
+				arg.i=-arg.i;
+			} else if (fl & MARK_POS) {
+				prefix++;
+			} else if (fl & PAD_POS) {
+				prefix+=2;
+			} else pl=0;
+		case 'u':
+			a = fmt_u(arg.i, z);
+			}
+			if (!arg.i && !p) continue;
+			if (p>=0) fl &= ~ZERO_PAD;
+			p = MAX(p, z-a + !arg.i);
+			break;
+		case 'c':
+			*(a=z-(p=1))=arg.i;
+			fl &= ~ZERO_PAD;
+			break;
+		case 'm':
+			if (1) a = strerror(errno); else
+		case 's':
+			a = arg.p;
+			z = memchr(a, 0, p);
+			if (!z) z=a+p;
+			else p=z-a;
+			fl &= ~ZERO_PAD;
+			break;
+		case 'C':
+			wc[0] = arg.i;
+			wc[1] = 0;
+			arg.p = wc;
+			p = -1;
+		case 'S':
+			ws = arg.p;
+			for (i=0; *ws && (l=wctomb(mb, *ws++))>=0 && l<=0U+p-i; i+=l);
+			if (l<0) return -1;
+			p = i;
+			pad(f, ' ', w, p, fl);
+			ws = arg.p;
+			for (i=0; *ws && i+(l=wctomb(mb, *ws++))<=p; i+=l)
+				out(f, mb, l);
+			pad(f, ' ', w, p, fl^LEFT_ADJ);
+			l = w>p ? w : p;
+			continue;
+		case 'e': case 'f': case 'g': case 'a':
+		case 'E': case 'F': case 'G': case 'A':
+			l = fmt_fp(f, arg.f, w, p, fl, t);
+			continue;
+		}
+
+		if (p < z-a) p = z-a;
+		if (w < pl+p) w = pl+p;
+
+		pad(f, ' ', w, pl+p, fl);
+		out(f, prefix, pl);
+		pad(f, '0', w, pl+p, fl^ZERO_PAD);
+		pad(f, '0', p, z-a, 0);
+		out(f, a, z-a);
+		pad(f, ' ', w, pl+p, fl^LEFT_ADJ);
+
+		l = w;
+	}
+
+	if (f) return cnt;
+	if (!l10n) return 0;
+
+	for (i=1; i<=NL_ARGMAX && nl_type[i]; i++)
+		pop_arg(nl_arg+i, nl_type[i], ap);
+	for (; i<=NL_ARGMAX && !nl_type[i]; i++);
+	if (i<=NL_ARGMAX) return -1;
+	return 1;
+}
+
+int vfprintf(FILE *f, const char *fmt, va_list ap)
+{
+	va_list ap2;
+	int nl_type[NL_ARGMAX] = {0};
+	union arg nl_arg[NL_ARGMAX];
+	int ret;
+
+	va_copy(ap2, ap);
+	if (printf_core(0, fmt, &ap2, nl_arg, nl_type) < 0) return -1;
+
+	FLOCK(f);
+	ret = printf_core(f, fmt, &ap2, nl_arg, nl_type);
+	FUNLOCK(f);
+	va_end(ap2);
+	return ret;
+}
diff --git a/src/stdio/vfscanf.c b/src/stdio/vfscanf.c
new file mode 100644
index 0000000..69f4508
--- /dev/null
+++ b/src/stdio/vfscanf.c
@@ -0,0 +1,43 @@
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <ctype.h>
+
+#include "stdio_impl.h"
+#include "__scanf.h"
+
+static void f_read(rctx_t *r)
+{
+	FILE *f = r->opaque;
+	if ((r->c = __uflow(f)) >= 0) r->l++;
+}
+
+int vfscanf(FILE *f, const char *fmt, va_list ap)
+{
+	size_t l = strlen(fmt), i, result;
+	rctx_t r = { f_read, (void *)f, 0, isspace };
+	wchar_t fmt2[l+1];
+
+	if (l > 0x100000) {
+		errno = ENOMEM;
+		return -1;
+	}
+	for (i=0; i<=l; i++) fmt2[i] = (unsigned char)fmt[i];
+
+	FLOCK(f);
+
+	result = __scanf(&r, fmt2, ap);
+
+	if (r.u && r.c >= 0) {
+		/* This code takes care of the case where the caller performs
+		 * a nonmatching scanf to leave a character in the unscan
+		 * buffer, followed by an unget, followed by a scanf that
+		 * matches zero characters. In this case the final 'unread'
+		 * character must be returned to the unget buffer rather than
+		 * the unscan buffer. */
+		 f->rpos--;
+	}
+
+	FUNLOCK(f);
+	return result;
+}
diff --git a/src/stdio/vfwscanf.c b/src/stdio/vfwscanf.c
new file mode 100644
index 0000000..491c140
--- /dev/null
+++ b/src/stdio/vfwscanf.c
@@ -0,0 +1,28 @@
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <wchar.h>
+#include <wctype.h>
+
+#include "stdio_impl.h"
+#include "__scanf.h"
+
+static void f_read(rctx_t *r)
+{
+	FILE *f = r->opaque;
+	if ((r->c = fgetwc(f)) >= 0) r->l++;
+}
+
+int vfwscanf(FILE *f, const wchar_t *fmt, va_list ap)
+{
+	rctx_t r = { f_read, (void *)f, 1, iswspace };
+	int result;
+
+	result = __scanf(&r, fmt, ap);
+
+	if (r.u && r.c >= 0) {
+		ungetwc(r.c, f);
+	}
+
+	return result;
+}
diff --git a/src/stdio/vprintf.c b/src/stdio/vprintf.c
new file mode 100644
index 0000000..67b38da
--- /dev/null
+++ b/src/stdio/vprintf.c
@@ -0,0 +1,6 @@
+#include <stdio.h>
+
+int vprintf(const char *fmt, va_list ap)
+{
+	return vfprintf(stdout, fmt, ap);
+}
diff --git a/src/stdio/vscanf.c b/src/stdio/vscanf.c
new file mode 100644
index 0000000..6f55b1c
--- /dev/null
+++ b/src/stdio/vscanf.c
@@ -0,0 +1,7 @@
+#include <stdio.h>
+#include <stdarg.h>
+
+int vscanf(const char *fmt, va_list ap)
+{
+	return vfscanf(stdin, fmt, ap);
+}
diff --git a/src/stdio/vsnprintf.c b/src/stdio/vsnprintf.c
new file mode 100644
index 0000000..bda6b49
--- /dev/null
+++ b/src/stdio/vsnprintf.c
@@ -0,0 +1,33 @@
+#include "stdio_impl.h"
+
+static size_t sn_write(FILE *f, const unsigned char *s, size_t l)
+{
+	/* pretend to succeed, but discard data */
+	return l;
+}
+
+int vsnprintf(char *s, size_t n, const char *fmt, va_list ap)
+{
+	int r;
+	FILE f;
+	unsigned char buf[1];
+
+	memset(&f, 0, sizeof(FILE));
+	f.lbf = EOF;
+	f.write = sn_write;
+	f.buf_size = 1;
+	f.buf = buf;
+	if (n > INT_MAX) {
+		errno = EOVERFLOW;
+		return -1;
+	} else if (n > 0) {
+		if (n > (char *)0+SIZE_MAX-s) n = (char *)0+SIZE_MAX-s;
+		f.wpos = s;
+		f.wbase = f.wend = s+n-1;
+		f.wstop = f.wend - 1;
+	}
+	r = vfprintf(&f, fmt, ap);
+	/* wpos points just after last byte written, or to s+n-1 (wbase) */
+	*f.wpos = 0;
+	return r;
+}
diff --git a/src/stdio/vsprintf.c b/src/stdio/vsprintf.c
new file mode 100644
index 0000000..7836ccb
--- /dev/null
+++ b/src/stdio/vsprintf.c
@@ -0,0 +1,7 @@
+#include <stdio.h>
+#include <limits.h>
+
+int vsprintf(char *s, const char *fmt, va_list ap)
+{
+	return vsnprintf(s, INT_MAX, fmt, ap);
+}
diff --git a/src/stdio/vsscanf.c b/src/stdio/vsscanf.c
new file mode 100644
index 0000000..fd48f70
--- /dev/null
+++ b/src/stdio/vsscanf.c
@@ -0,0 +1,21 @@
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+
+#include "__scanf.h"
+
+static void s_read(rctx_t *r)
+{
+	unsigned char *s = r->opaque;
+	if (!s[r->l]) r->c = -1;
+	else r->c = s[r->l++];
+}
+
+int vsscanf(const char *s, const char *fmt, va_list ap)
+{
+	size_t l = strlen(fmt), i;
+	wchar_t fmt2[l+1];
+	rctx_t r = { s_read, (void *)s, 0, isspace };
+	for (i=0; i<=l; i++) fmt2[i] = (unsigned char)fmt[i];
+	return __scanf(&r, fmt2, ap);
+}
diff --git a/src/stdio/vswscanf.c b/src/stdio/vswscanf.c
new file mode 100644
index 0000000..2c4ffbe
--- /dev/null
+++ b/src/stdio/vswscanf.c
@@ -0,0 +1,19 @@
+#include <stdio.h>
+#include <string.h>
+#include <wchar.h>
+#include <wctype.h>
+
+#include "__scanf.h"
+
+static void s_read(rctx_t *r)
+{
+	wchar_t *s = r->opaque;
+	if (!s[r->l]) r->c = -1;
+	else r->c = s[r->l++];
+}
+
+int vswscanf(const wchar_t *s, const wchar_t *fmt, va_list ap)
+{
+	rctx_t r = { s_read, (void *)s, 1, iswspace };
+	return __scanf(&r, fmt, ap);
+}
diff --git a/src/stdio/vwscanf.c b/src/stdio/vwscanf.c
new file mode 100644
index 0000000..86da045
--- /dev/null
+++ b/src/stdio/vwscanf.c
@@ -0,0 +1,8 @@
+#include <stdio.h>
+#include <stdarg.h>
+#include <wchar.h>
+
+int vwscanf(const wchar_t *fmt, va_list ap)
+{
+	return vfwscanf(stdin, fmt, ap);
+}
diff --git a/src/stdio/wscanf.c b/src/stdio/wscanf.c
new file mode 100644
index 0000000..34b5884
--- /dev/null
+++ b/src/stdio/wscanf.c
@@ -0,0 +1,13 @@
+#include <stdio.h>
+#include <stdarg.h>
+#include <wchar.h>
+
+int wscanf(const wchar_t *fmt, ...)
+{
+	int ret;
+	va_list ap;
+	va_start(ap, fmt);
+	ret = vwscanf(fmt, ap);
+	va_end(ap);
+	return ret;
+}