Add getdirentries() and stat() for Mac OS X.

Also add fstat() and lstat().  I don't #define the constants for
st_mode or d_type, but I provide enough to get the block size of a
file and to list the names in a directory.  Some fields of struct stat
get truncated, see XXX in plat/osx/include/sys/stat.h.

In struct dirent, the inode field might be d_ino or d_fileno.  I
picked d_ino because Apple's sys/dirent.h uses d_ino (but Apple's
manual pages use d_fileno).

plat/osx/include/build.lua

@@ -9,7 +9,9 @@ local function addheader(h)
 end
 
 addheader("ack/config.h")
+addheader("sys/dirent.h")
 addheader("sys/mman.h")
+addheader("sys/stat.h")
 addheader("sys/types.h")
 addheader("unistd.h")
 

plat/osx/include/sys/dirent.h

@@ -0,0 +1,17 @@
+#ifndef _SYS_DIRENT_H
+#define _SYS_DIRENT_H
+
+#include <sys/types.h>
+
+struct dirent {
+	ino_t		d_ino;
+	unsigned short	d_reclen;
+	unsigned char	d_type;
+	unsigned char	d_namlen;
+#define MAXNAMLEN 255
+	char		d_name[MAXNAMLEN + 1];
+};
+
+int getdirentries(int, char *, int, long *);
+
+#endif

plat/osx/include/sys/stat.h

@@ -0,0 +1,49 @@
+#ifndef _SYS_STAT_H
+#define _SYS_STAT_H
+
+#include <sys/types.h>
+#include <sys/time.h> /* for timespec */
+
+struct stat {
+	dev_t		st_dev;
+	ino_t		st_ino;
+	mode_t		st_mode;
+	nlink_t		st_nlink;
+	uid_t		st_uid;
+	gid_t		st_gid;
+	dev_t		st_rdev;
+	struct timespec	st_atim;
+	struct timespec	st_mtim;
+	struct timespec	st_ctim;
+#define st_atime st_atim.tv_sec
+#define st_mtime st_mtim.tv_sec
+#define st_ctime st_ctim.tv_sec
+	/*
+	 * XXX - We don't have 64-bit integers, so we only expose the
+	 * lower 32 bits of 64-bit fields.  We insert dummy fields for
+	 * the higher 32 bits.
+	 */
+#if defined(__i386)
+	off_t		st_size;
+	off_t		_st_size_hi;
+	blkcnt_t	st_blocks;
+	blkcnt_t	_st_blkcnt_hi;
+#elif defined(__powerpc)
+	off_t		_st_size_hi;
+	off_t		st_size;
+	blkcnt_t	_st_blkcnt_hi;
+	blkcnt_t	st_blkcnt;
+#else
+#error unknown arch
+#endif
+	blksize_t	st_blksize;
+	unsigned int	st_flags;
+	unsigned int	st_gen;
+	unsigned int	_st_spare[5];
+};
+
+int fstat(int, struct stat *);
+int lstat(const char *, struct stat *);
+int stat(const char *, struct stat *);
+
+#endif

plat/osx/include/sys/types.h

@@ -3,7 +3,15 @@
 
 #include <stddef.h> /* for off_t, ptrdiff_t, size_t */
 
+typedef int			blkcnt_t; /* XXX should have 64 bits */
+typedef int			blksize_t;
+typedef int			dev_t;
+typedef unsigned int		gid_t;
+typedef unsigned int		ino_t;
+typedef unsigned short		mode_t;
+typedef unsigned short		nlink_t;
 typedef int			pid_t;
 typedef ptrdiff_t		ssize_t;
+typedef unsigned int		uid_t;
 
 #endif

plat/osx/include/unistd.h

@@ -22,6 +22,11 @@ int ioctl(int, unsigned long, ...);
 typedef long _libsys_time_t;
 typedef int suseconds_t;
 
+struct timespec {
+	_libsys_time_t tv_sec;
+	long tv_nsec;
+};
+
 struct timeval {
 	_libsys_time_t tv_sec;
 	suseconds_t tv_usec;
@@ -48,8 +53,6 @@ int gettimeofday(struct timeval *, struct timezone *);
 #define O_TRUNC		0x0400
 #define O_EXCL		0x0800
 
-typedef int mode_t;
-
 int creat(const char *, mode_t);
 int open(const char *, int, ...);
 

plat/osx386/libsys/build.lua

@@ -3,17 +3,21 @@ acklibrary {
 	srcs = {
 		"./_exit.s",
 		"./close.s",
+		"./fstat.s",
+		"./getdirentries.s",
 		"./getpid.s",
 		"./gettimeofday.s",
 		"./ioctl.s",
 		"./kill.s",
 		"./lseek.s",
+		"./lstat.s",
 		"./mmap.s",
 		"./mprotect.s",
 		"./open.s",
 		"./read.s",
 		"./set_errno.s",
 		"./sigaction.s",
+		"./stat.s",
 		"./write.s",
 		"plat/linux/libsys/errno.s",
 		"plat/osx/libsys/brk.c",

plat/osx386/libsys/fstat.s

@@ -0,0 +1,7 @@
+.sect .text
+.define _fstat
+_fstat:
+	mov eax, 189
+	int 0x80
+	jb .set_errno
+	ret

plat/osx386/libsys/getdirentries.s

@@ -0,0 +1,7 @@
+.sect .text
+.define _getdirentries
+_getdirentries:
+	mov eax, 196
+	int 0x80
+	jb .set_errno
+	ret

plat/osx386/libsys/lstat.s

@@ -0,0 +1,7 @@
+.sect .text
+.define _lstat
+_lstat:
+	mov eax, 190
+	int 0x80
+	jb .set_errno
+	ret

plat/osx386/libsys/stat.s

@@ -0,0 +1,7 @@
+.sect .text
+.define _stat
+_stat:
+	mov eax, 188
+	int 0x80
+	jb .set_errno
+	ret

plat/osxppc/libsys/build.lua

@@ -3,17 +3,21 @@ acklibrary {
 	srcs = {
 		"./_exit.s",
 		"./close.s",
+		"./fstat.s",
+		"./getdirentries.s",
 		"./getpid.s",
 		"./gettimeofday.s",
 		"./ioctl.s",
 		"./kill.s",
 		"./lseek.s",
+		"./lstat.s",
 		"./mmap.s",
 		"./mprotect.s",
 		"./open.s",
 		"./read.s",
 		"./set_errno.s",
 		"./sigaction.s",
+		"./stat.s",
 		"./write.s",
 		"plat/linuxppc/libsys/trap.s",
 		"plat/osx/libsys/brk.c",

plat/osxppc/libsys/fstat.s

@@ -0,0 +1,9 @@
+.sect .text
+.define _fstat
+_fstat:
+	addi r0, r0, 189	! fstat
+	lwz r3, 0(sp)		! fd
+	lwz r4, 4(sp)		! stat pointer
+	sc 0
+	b .set_errno
+	bclr 20, 0, 0

plat/osxppc/libsys/getdirentries.s

@@ -0,0 +1,11 @@
+.sect .text
+.define _getdirentries
+_getdirentries:
+	addi r0, r0, 196	! getdirentries
+	lwz r3, 0(sp)		! fd
+	lwz r4, 4(sp)		! buffer
+	lwz r5, 8(sp)		! buffer size
+	lwz r6, 12(sp)		! base pointer
+	sc 0
+	b .set_errno
+	bclr 20, 0, 0

plat/osxppc/libsys/lstat.s

@@ -0,0 +1,9 @@
+.sect .text
+.define _lstat
+_lstat:
+	addi r0, r0, 190	! lstat
+	lwz r3, 0(sp)		! path
+	lwz r4, 4(sp)		! stat pointer
+	sc 0
+	b .set_errno
+	bclr 20, 0, 0

plat/osxppc/libsys/stat.s

@@ -0,0 +1,9 @@
+.sect .text
+.define _stat
+_stat:
+	addi r0, r0, 188	! stat
+	lwz r3, 0(sp)		! path
+	lwz r4, 4(sp)		! stat pointer
+	sc 0
+	b .set_errno
+	bclr 20, 0, 0