feat: add linux compatibility

Signed-off-by: sisungo <[email protected]>

build.sh

@@ -2,4 +2,4 @@
 
 cd $(dirname $0)
 
-${CC} -O3 ${CFLAGS} -o ./grep *.c
+${CC} -O3 ${CFLAGS} -o ./grep *.c $(pcre2-config --libs-posix)

compat.h

@@ -0,0 +1,21 @@
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+
+#ifndef __DECONST
+#define __DECONST(type, var)    ((type)(uintptr_t)(const void *)(var))
+#endif
+
+static inline const char *getprogname() {
+    return "grep";
+}
+
+static inline void warnc(int code, const char *fmt, ...) {
+    va_list args;
+
+    fprintf(stderr, "warning: ");
+    va_start(args, fmt);
+    vfprintf(stderr, fmt, args);
+    va_end(args);
+    fprintf(stderr, ": %s\n", strerror(code));
+}

fts.h

@@ -0,0 +1,155 @@
+/*	$NetBSD: fts.h,v 1.19 2009/08/16 19:33:38 christos Exp $	*/
+
+/*
+ * Copyright (c) 1989, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)fts.h	8.3 (Berkeley) 8/14/94
+ */
+
+#ifndef	_FTS_H_
+#define	_FTS_H_
+
+#include <stdint.h>
+#include <sys/types.h>
+
+#ifndef	__fts_stat_t
+#define	__fts_stat_t	struct stat
+#endif
+#ifndef	__fts_nlink_t
+#define	__fts_nlink_t	nlink_t
+#endif
+#ifndef	__fts_ino_t
+#define	__fts_ino_t	ino_t
+#endif
+#ifndef	__fts_length_t
+#define	__fts_length_t	unsigned int
+#endif
+#ifndef	__fts_number_t
+#define	__fts_number_t	int64_t
+#endif
+#ifndef	__fts_dev_t
+#define	__fts_dev_t	dev_t
+#endif
+#ifndef	__fts_level_t
+#define	__fts_level_t	int
+#endif
+
+typedef struct {
+	struct _ftsent *fts_cur;	/* current node */
+	struct _ftsent *fts_child;	/* linked list of children */
+	struct _ftsent **fts_array;	/* sort array */
+	dev_t fts_dev;			/* starting device # */
+	char *fts_path;			/* path for this descent */
+	int fts_rfd;			/* fd for root */
+	unsigned int fts_pathlen;	/* sizeof(path) */
+	unsigned int fts_nitems;	/* elements in the sort array */
+	int (*fts_compar)		/* compare function */
+		(const struct _ftsent **, const struct _ftsent **);
+
+#define	FTS_COMFOLLOW	0x001		/* follow command line symlinks */
+#define	FTS_LOGICAL	0x002		/* logical walk */
+#define	FTS_NOCHDIR	0x004		/* don't change directories */
+#define	FTS_NOSTAT	0x008		/* don't get stat info */
+#define	FTS_PHYSICAL	0x010		/* physical walk */
+#define	FTS_SEEDOT	0x020		/* return dot and dot-dot */
+#define	FTS_XDEV	0x040		/* don't cross devices */
+#define	FTS_WHITEOUT	0x080		/* return whiteout information */
+#define	FTS_OPTIONMASK	0x0ff		/* valid user option mask */
+
+#define	FTS_NAMEONLY	0x100		/* (private) child names only */
+#define	FTS_STOP	0x200		/* (private) unrecoverable error */
+	int fts_options;		/* fts_open options, global flags */
+} FTS;
+
+typedef struct _ftsent {
+	struct _ftsent *fts_cycle;	/* cycle node */
+	struct _ftsent *fts_parent;	/* parent directory */
+	struct _ftsent *fts_link;	/* next file in directory */
+	__fts_number_t fts_number;      /* local numeric value */
+	void *fts_pointer;	        /* local address value */
+	char *fts_accpath;		/* access path */
+	char *fts_path;			/* root path */
+	int fts_errno;			/* errno for this node */
+	int fts_symfd;			/* fd for symlink */
+	__fts_length_t fts_pathlen;	/* strlen(fts_path) */
+	__fts_length_t fts_namelen;	/* strlen(fts_name) */
+
+	__fts_ino_t fts_ino;		/* inode */
+	__fts_dev_t fts_dev;		/* device */
+	__fts_nlink_t fts_nlink;	/* link count */
+
+#define	FTS_ROOTPARENTLEVEL	-1
+#define	FTS_ROOTLEVEL		 0
+	__fts_level_t fts_level;		/* depth (-1 to N) */
+
+#define	FTS_D		 1		/* preorder directory */
+#define	FTS_DC		 2		/* directory that causes cycles */
+#define	FTS_DEFAULT	 3		/* none of the above */
+#define	FTS_DNR		 4		/* unreadable directory */
+#define	FTS_DOT		 5		/* dot or dot-dot */
+#define	FTS_DP		 6		/* postorder directory */
+#define	FTS_ERR		 7		/* error; errno is set */
+#define	FTS_F		 8		/* regular file */
+#define	FTS_INIT	 9		/* initialized only */
+#define	FTS_NS		10		/* stat(2) failed */
+#define	FTS_NSOK	11		/* no stat(2) requested */
+#define	FTS_SL		12		/* symbolic link */
+#define	FTS_SLNONE	13		/* symbolic link without target */
+#define	FTS_W		14		/* whiteout object */
+	unsigned short fts_info;	/* user flags for FTSENT structure */
+
+#define	FTS_DONTCHDIR	 0x01		/* don't chdir .. to the parent */
+#define	FTS_SYMFOLLOW	 0x02		/* followed a symlink to get here */
+#define	FTS_ISW		 0x04		/* this is a whiteout object */
+	unsigned short fts_flags;	/* private flags for FTSENT structure */
+
+#define	FTS_AGAIN	 1		/* read node again */
+#define	FTS_FOLLOW	 2		/* follow symbolic link */
+#define	FTS_NOINSTR	 3		/* no instructions */
+#define	FTS_SKIP	 4		/* discard node */
+	unsigned short fts_instr;	/* fts_set() instructions */
+
+	__fts_stat_t *fts_statp;	/* stat(2) information */
+	char fts_name[1];		/* file name */
+} FTSENT;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+FTSENT	*fts_children(FTS *, int);
+int	 fts_close(FTS *);
+FTS	*fts_open(char * const *, int,
+    int (*)(const FTSENT **, const FTSENT **));
+FTSENT	*fts_read(FTS *);
+int	 fts_set(FTS *, FTSENT *, int);
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif /* !_FTS_H_ */

grep.c

@@ -30,7 +30,6 @@
  * SUCH DAMAGE.
  */
 
-#include <sys/cdefs.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 
@@ -48,6 +47,7 @@
 #include <string.h>
 #include <unistd.h>
 
+#include "compat.h"
 #include "grep.h"
 
 const char	*errstr[] = {

grep.h

@@ -32,7 +32,7 @@
 
 #include <bzlib.h>
 #include <limits.h>
-#include <regex.h>
+#include <pcre2posix.h>
 #include <stdbool.h>
 #include <stdio.h>
 #include <zlib.h>

util.c

@@ -31,7 +31,6 @@
  * SUCH DAMAGE.
  */
 
-#include <sys/cdefs.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 
@@ -39,7 +38,6 @@
 #include <err.h>
 #include <errno.h>
 #include <fnmatch.h>
-#include <fts.h>
 #include <libgen.h>
 #include <stdbool.h>
 #include <stdio.h>
@@ -49,6 +47,8 @@
 #include <wchar.h>
 #include <wctype.h>
 
+#include "compat.h"
+#include "fts.h"
 #include "grep.h"
 
 static bool	 first_match = true;