mescc: Mes C Library: Add closedir, opendir, readdir.

* include/dirent.h: New file.  Import from glibc-2.2.5.
* include/dirstream.h: Likewise.
* lib/dirent/__getdirentries.c: Likewise.
* lib/dirent/closedir.c: Likewise.
* lib/dirent/readdir.c (readdir): Likewise.
* lib/libc+gnu.c: Include them.
* include/linux/x86/syscall.h (SYS_getdents): New macro.
* include/linux/x86_64/syscall.h (SYS_getdents): Likewise.
* lib/linux/gnu.c (getdents): New function.
* include/limits.h (NAME_MAX): New macro.
* include/fcntl.h (O_DIRECTORY): New macro.
* scaffold/tests/readdir.dir: New directory.
* scaffold/tests/99-readdir.c: New file, use it.
* build-aux/check-mescc.sh (tests): Run it.

build-aux/check-mescc.sh

@@ -141,6 +141,7 @@ t
 96-strto
 97-fopen
 98-fopen
+99-readdir
 "
 
 # 90: needs GNU, fails for mescc, passes for tcc

include/dirent.h

@@ -0,0 +1,76 @@
+/* -*-comment-start: "//";comment-end:""-*-
+ * GNU Mes --- Maxwell Equations of Software
+ * Copyright (C) 1991, 1992 Free Software Foundation, Inc.
+ * Copyright © 2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+ *
+ * This file is part of GNU Mes.
+ *
+ * GNU Mes is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or (at
+ * your option) any later version.
+ *
+ * GNU Mes is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Mes.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __MES_DIRENT_H
+#define __MES_DIRENT_H 1
+
+#if WITH_GLIBC
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+#undef __MES_DIRENT_H
+#include_next <dirent.h>
+
+#else // ! WITH_GLIBC
+
+#include <dirstream.h>
+
+// Taken from GNU C Library 1.06.4, 2.2.5
+
+/*
+ *	POSIX Standard: 5.1.2 Directory Operations	<dirent.h>
+ */
+
+#include <stddef.h>
+
+int __getdirentries (int filedes, char *buffer, size_t nbytes, off_t *basep);
+
+struct dirent
+  {
+    ino_t d_ino;
+    off_t d_off;
+    unsigned short int d_reclen;
+#if 0
+    unsigned char d_type;
+#endif
+    char d_name[256];		/* We must not include limits.h! */
+  };
+
+/* Open a directory stream on NAME.
+   Return a DIR stream on the directory, or NULL if it could not be opened.  */
+DIR *opendir (char const *name);
+
+/* Close the directory stream DIRP.
+   Return 0 if successful, -1 if not.  */
+int closedir (DIR *dirp);
+
+/* Read a directory entry from DIRP.
+   Return a pointer to a `struct dirent' describing the entry,
+   or NULL for EOF or error.  The storage returned may be overwritten
+   by a later readdir call on the same DIR stream.  */
+struct dirent *readdir (DIR *dirp);
+
+/* Rewind DIRP to the beginning of the directory.  */
+extern void rewinddir (DIR *dirp);
+
+#endif // ! WITH_GLIBC
+
+#endif // __MES_DIRENT_H

include/dirstream.h

@@ -0,0 +1,55 @@
+/* -*-comment-start: "//";comment-end:""-*-
+ * GNU Mes --- Maxwell Equations of Software
+ *Copyright (C) 1993, 1995, 1996 Free Software Foundation, Inc.
+ * Copyright © 2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+ *
+ * This file is part of GNU Mes.
+ *
+ * GNU Mes is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or (at
+ * your option) any later version.
+ *
+ * GNU Mes is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Mes.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __MES_DIRSTREAM_H
+#define __MES_DIRSTREAM_H 1
+
+#if WITH_GLIBC
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+#undef __MES_DIRSTREAM_H
+#include_next <dirstream.h>
+
+#else // ! WITH_GLIBC
+
+#include <sys/types.h>
+
+// Taken from GNU C Library 2.2.5
+
+/* Directory stream type.  */
+struct __dirstream
+  {
+    int fd;			/* File descriptor.  */
+
+    char *data;			/* Directory block.  */
+    size_t allocation;		/* Space allocated for the block.  */
+    size_t size;		/* Total valid data in the block.  */
+    size_t offset;		/* Current offset into the block.  */
+
+    off_t filepos;		/* Position of next entry to read.  */
+  };
+
+typedef struct __dirstream DIR;
+
+#endif // ! WITH_GLIBC
+
+#endif // __MES_DIRSTREAM_H

include/fcntl.h

@@ -29,13 +29,14 @@
 
 #else // ! WITH_GLIBC
 
-#define O_RDONLY 0
-#define O_WRONLY 1
-#define O_RDWR 2
-#define O_CREAT 64
-#define O_EXCL 128
-#define O_TRUNC 512
-#define O_APPEND 1024
+#define O_RDONLY          0
+#define O_WRONLY          1
+#define O_RDWR            2
+#define O_CREAT        0x40
+#define O_EXCL         0x80
+#define O_TRUNC       0x200
+#define O_APPEND      0x400
+#define O_DIRECTORY 0x10000
 
 #define FD_CLOEXEC 1
 

include/limits.h

@@ -38,6 +38,8 @@
 #define LONG_MIN -2147483648
 #define LONG_MAX 2147483647
 #define _POSIX_OPEN_MAX 16
+#define PATH_MAX 512
+#define NAME_MAX 255
 
 #endif // ! WITH_GLIBC
 

include/linux/x86/syscall.h

@@ -66,5 +66,6 @@
 #define SYS_setitimer 0x68
 #define SYS_fstat     0x6c
 #define SYS_nanosleep 0xa2
+#define SYS_getdents  0x8d
 
 #endif // __MES_LINUX_X86_SYSCALL_H

include/linux/x86_64/syscall.h

@@ -63,5 +63,6 @@
 #define SYS_setitimer 0x26
 #define SYS_fstat     0x05
 #define SYS_nanosleep 0x33
+#define SYS_getdents  0x4e
 
 #endif // __MES_LINUX_X86_64_SYSCALL_H

include/sys/types.h

@@ -69,6 +69,12 @@ typedef int gid_t;
 typedef unsigned ino_t;
 #endif
 
+#ifndef __MES_INO64_T
+#define __MES_INO64_T
+#undef ino64_t
+typedef unsigned long long ino64_t;
+#endif
+
 #ifndef __MES_INTPTR_T
 #define __MES_INTPTR_T
 #undef intptr_t
@@ -81,6 +87,12 @@ typedef long intptr_t;
 typedef unsigned long off_t;
 #endif
 
+#ifndef __MES_OFF64_T
+#define __MES_OFF64_T
+#undef off64_t
+typedef unsigned long long off64_t;
+#endif
+
 #ifndef __MES_PID_T
 #define __MES_PID_T
 #undef pid_t

lib/dirent/__getdirentries.c

@@ -0,0 +1,35 @@
+/* -*-comment-start: "//";comment-end:""-*-
+ * GNU Mes --- Maxwell Equations of Software
+ * Copyright (C) 1993 Free Software Foundation, Inc.
+ * Copyright © 2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+ *
+ * This file is part of GNU Mes.
+ *
+ * GNU Mes is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or (at
+ * your option) any later version.
+ *
+ * GNU Mes is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Mes.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+// Taken from GNU C Library 1.06.4
+
+#include <dirent.h>
+#include <stdio.h>
+#include <unistd.h>
+
+int
+__getdirentries (int filedes, char *buffer, size_t nbytes, off_t *basep)
+{
+  if (basep)
+    *basep = lseek (filedes, (off_t) 0, SEEK_CUR);
+
+  return read (filedes, buf, nbytes);
+}

lib/dirent/closedir.c

@@ -0,0 +1,54 @@
+/* -*-comment-start: "//";comment-end:""-*-
+ * GNU Mes --- Maxwell Equations of Software
+ * Copyright (C) 1991, 1993, 1995, 1996, 1998 Free Software Foundation, Inc.
+ * Copyright © 2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+ *
+ * This file is part of GNU Mes.
+ *
+ * GNU Mes is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or (at
+ * your option) any later version.
+ *
+ * GNU Mes is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Mes.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+// Taken from GNU C Library 2.2.5
+
+#include <errno.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <dirent.h>
+#include <unistd.h>
+
+#include <errno.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <dirent.h>
+#include <unistd.h>
+#include <dirstream.h>
+
+/* Close the directory stream DIRP.
+   Return 0 if successful, -1 if not.  */
+int
+closedir (DIR *dirp)
+{
+  int filedes;
+
+  if (dirp == NULL)
+    {
+      errno = EINVAL;
+      return -1;
+    }
+
+  filedes = dirp->fd;
+  free (dirp);
+
+  return close (filedes);
+}

lib/dirent/opendir.c

@@ -0,0 +1,81 @@
+/* -*-comment-start: "//";comment-end:""-*-
+ * GNU Mes --- Maxwell Equations of Software
+ * Copyright (C) 1991-1996,98,2000,2001 Free Software Foundation, Inc.
+ * Copyright © 2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+ *
+ * This file is part of GNU Mes.
+ *
+ * GNU Mes is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or (at
+ * your option) any later version.
+ *
+ * GNU Mes is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Mes.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+// Taken from GNU C Library 2.2.5
+
+#include <errno.h>
+#include <limits.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <dirent.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <stdio.h>
+
+#include <dirstream.h>
+
+/* Open a directory stream on NAME.  */
+DIR *
+opendir (char const *name)
+{
+  DIR *dirp;
+  struct stat statbuf;
+  int fd;
+  size_t allocation;
+  int save_errno;
+
+  if (name[0] == '\0')
+    {
+      /* POSIX.1-1990 says an empty name gets ENOENT;
+	 but `open' might like it fine.  */
+      errno = ENOENT;
+      return 0;
+    }
+
+  fd = open (name, O_RDONLY|O_DIRECTORY);
+  if (fd < 0)
+    return 0;
+
+  if (fstat (fd, &statbuf) < 0)
+    goto lose;
+
+  if (fcntl (fd, F_SETFD, FD_CLOEXEC) < 0)
+    goto lose;
+
+  allocation = statbuf.st_blksize;
+
+  dirp = (DIR *) calloc (1, sizeof (DIR) + allocation);
+  if (!dirp)
+  lose:
+    {
+      save_errno = errno;
+      close (fd);
+      errno = save_errno;
+      return 0;
+    }
+  dirp->data = (char *) (dirp + 1);
+  dirp->allocation = allocation;
+  dirp->fd = fd;
+
+  return dirp;
+}

lib/dirent/readdir.c

@@ -0,0 +1,85 @@
+/* -*-comment-start: "//";comment-end:""-*-
+ * GNU Mes --- Maxwell Equations of Software
+ * Copyright (C) 1991,92,93,94,95,96,97,99,2000 Free Software Foundation, Inc.
+ * Copyright © 2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+ *
+ * This file is part of GNU Mes.
+ *
+ * GNU Mes is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or (at
+ * your option) any later version.
+ *
+ * GNU Mes is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Mes.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+// Taken from GNU C Library 2.2.5
+
+#include <errno.h>
+#include <limits.h>
+#include <stddef.h>
+#include <string.h>
+#include <dirent.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <assert.h>
+
+#include <dirstream.h>
+
+/* Read a directory entry from DIRP.  */
+struct dirent *
+readdir (DIR *dirp)
+{
+  struct dirent *dp;
+  int saved_errno = errno;
+
+  do
+    {
+      size_t reclen;
+
+      if (dirp->offset >= dirp->size)
+	{
+	  /* We've emptied out our buffer.  Refill it.  */
+
+	  size_t maxread;
+	  ssize_t bytes;
+
+	  maxread = dirp->allocation;
+
+#if 0
+	  off_t base;
+	  bytes = __getdirentries (dirp->fd, dirp->data, maxread, &base);
+#else
+          bytes = getdents (dirp->fd, dirp->data, maxread);
+#endif
+	  if (bytes <= 0)
+	    {
+	      /* Don't modifiy errno when reaching EOF.  */
+	      if (bytes == 0)
+                errno = saved_errno;
+	      dp = 0;
+	      break;
+	    }
+	  dirp->size = (size_t) bytes;
+
+	  /* Reset the offset into the buffer.  */
+	  dirp->offset = 0;
+	}
+
+      dp = (struct dirent *) &dirp->data[dirp->offset];
+
+      reclen = dp->d_reclen;
+      dirp->offset += reclen;
+      dirp->filepos = dp->d_off;
+
+      /* Skip deleted files.  */
+    } while (dp->d_ino == 0);
+
+  return dp;
+}

lib/libc+gnu.c

@@ -98,3 +98,8 @@
 
 #include <stdlib/__exit.c>
 #include <stub/__cleanup.c>
+
+#include <dirent/__getdirentries.c>
+#include <dirent/closedir.c>
+#include <dirent/opendir.c>
+#include <dirent/readdir.c>

lib/linux/gnu.c

@@ -145,3 +145,9 @@ fstat (int fd, struct stat *statbuf)
 {
   return _sys_call2 (SYS_fstat, (long)fd, (long)statbuf);
 }
+
+int
+getdents (long filedes, char *buffer, size_t nbytes)
+{
+  return _sys_call3 (SYS_getdents, (long)filedes, (long)buffer, (long)nbytes);
+}

scaffold/tests/99-readdir.c

@@ -0,0 +1,110 @@
+/* -*-comment-start: "//";comment-end:""-*-
+ * GNU Mes --- Maxwell Equations of Software
+ * Copyright © 2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+ *
+ * This file is part of GNU Mes.
+ *
+ * GNU Mes is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or (at
+ * your option) any later version.
+ *
+ * GNU Mes is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Mes.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libmes.h>
+#include <string.h>
+#include <dirent.h>
+#include <errno.h>
+
+int
+qsort_strcmp (void const* a, void const* b)
+{
+  return strcmp (*((char**) a), *((char**) b));
+}
+
+int
+main ()
+{
+  DIR *d = opendir ("scaffold/tests/readdir-fu");
+  if (d)
+    return 1;
+  if (errno != ENOENT)
+    return 2;
+
+  d = opendir ("scaffold/tests/99-readdir.c");
+  if (d)
+    return 3;
+  if (errno != ENOTDIR)
+    return 4;
+
+  errno = 0;
+  d = opendir ("scaffold/tests/readdir.dir");
+  if (!d)
+    return 5;
+
+  if (errno)
+    return 6;
+
+  int i = 0;
+  char* list[6] = {0};
+  struct dirent *entry = readdir (d);
+  if (!entry)
+    return 7;
+  oputs (entry->d_name);
+  oputs ("\n");
+  list[i++] = entry->d_name;
+
+  entry = readdir (d);
+  if (!entry)
+    return 8;
+  oputs (entry->d_name);
+  oputs ("\n");
+  list[i++] = entry->d_name;
+
+  entry = readdir (d);
+  if (!entry)
+    return 9;
+  oputs (entry->d_name);
+  oputs ("\n");
+  list[i++] = entry->d_name;
+
+  entry = readdir (d);
+  if (!entry)
+    return 10;
+  oputs (entry->d_name);
+  oputs ("\n");
+  list[i++] = entry->d_name;
+
+  entry = readdir (d);
+  if (!entry)
+    return 11;
+  oputs (entry->d_name);
+  oputs ("\n");
+  list[i++] = entry->d_name;
+
+  entry = readdir (d);
+  if (entry)
+    return 12;
+
+  oputs ("\nls:\n");
+  qsort (list, 5, sizeof (char*), qsort_strcmp);
+  for (int i = 0; i < 5; i++)
+    {
+      oputs (list[i]); oputs ("\n");
+    }
+
+  if (strcmp (list[0], "."))
+    return 13;
+
+  if (strcmp (list[4], "link"))
+    return 14;
+
+  return 0;
+}

scaffold/tests/readdir.dir/file

@@ -0,0 +1 @@
+file

scaffold/tests/readdir.dir/link

@@ -0,0 +1 @@
+file