initial import of NetBSD tree

1 files changed, 342 insertions, 0 deletions

diff --git a/usr.bin/file/file.c b/usr.bin/file/file.c
new file mode 100644
index 00000000000..a17274318ff
--- /dev/null
+++ b/usr.bin/file/file.c
@@ -0,0 +1,342 @@
+/*
+ * file - find type of a file or files - main program.
+ *
+ * Copyright (c) Ian F. Darwin, 1987.
+ * Written by Ian F. Darwin.
+ *
+ * This software is not subject to any license of the American Telephone
+ * and Telegraph Company or of the Regents of the University of California.
+ *
+ * Permission is granted to anyone to use this software for any purpose on
+ * any computer system, and to alter it and redistribute it freely, subject
+ * to the following restrictions:
+ *
+ * 1. The author is not responsible for the consequences of use of this
+ *    software, no matter how awful, even if they arise from flaws in it.
+ *
+ * 2. The origin of this software must not be misrepresented, either by
+ *    explicit claim or by omission.  Since few users ever read sources,
+ *    credits must appear in the documentation.
+ *
+ * 3. Altered versions must be plainly marked as such, and must not be
+ *    misrepresented as being the original software.  Since few users
+ *    ever read sources, credits must appear in the documentation.
+ *
+ * 4. This notice may not be removed or altered.
+ */
+#ifndef	lint
+static char *moduleid = 
+	"@(#)$Id: file.c,v 1.1 1995/10/18 08:45:09 deraadt Exp $";
+#endif	/* lint */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/param.h>	/* for MAXPATHLEN */
+#include <sys/stat.h>
+#include <fcntl.h>	/* for open() */
+#if (__COHERENT__ >= 0x420)
+#include <sys/utime.h>
+#else
+#include <utime.h>
+#endif
+#include <unistd.h>	/* for read() */
+
+#ifdef __ELF__
+#include <elf.h>
+#endif
+
+#include "patchlevel.h"
+#include "file.h"
+
+#ifdef S_IFLNK
+# define USAGE  "Usage: %s [-vczL] [-f namefile] [-m magicfile] file...\n"
+#else
+# define USAGE  "Usage: %s [-vcz] [-f namefile] [-m magicfile] file...\n"
+#endif
+
+#ifndef MAGIC
+# define MAGIC "/etc/magic"
+#endif
+
+int 			/* Global command-line options 		*/
+	debug = 0, 	/* debugging 				*/
+	lflag = 0,	/* follow Symlinks (BSD only) 		*/
+	zflag = 0;	/* follow (uncompress) compressed files */
+
+int			/* Misc globals				*/
+	nmagic = 0;	/* number of valid magic[]s 		*/
+
+struct  magic *magic;	/* array of magic entries		*/
+
+char *magicfile;	/* where magic be found 		*/
+
+char *progname;		/* used throughout 			*/
+int lineno;		/* line number in the magic file	*/
+
+
+static void unwrap	__P((char *fn));
+
+/*
+ * main - parse arguments and handle options
+ */
+int
+main(argc, argv)
+int argc;
+char *argv[];
+{
+	int c;
+	int check = 0, didsomefiles = 0, errflg = 0, ret = 0, app = 0;
+
+	if ((progname = strrchr(argv[0], '/')) != NULL)
+		progname++;
+	else
+		progname = argv[0];
+
+	if (!(magicfile = getenv("MAGIC")))
+		magicfile = MAGIC;
+
+	while ((c = getopt(argc, argv, "vcdf:Lm:z")) != EOF)
+		switch (c) {
+		case 'v':
+			(void) fprintf(stdout, "%s-%d.%d\n", progname,
+				       FILE_VERSION_MAJOR, patchlevel);
+			return 1;
+		case 'c':
+			++check;
+			break;
+		case 'd':
+			++debug;
+			break;
+		case 'f':
+			if (!app) {
+				ret = apprentice(magicfile, check);
+				if (check)
+					exit(ret);
+				app = 1;
+			}
+			unwrap(optarg);
+			++didsomefiles;
+			break;
+#ifdef S_IFLNK
+		case 'L':
+			++lflag;
+			break;
+#endif
+		case 'm':
+			magicfile = optarg;
+			break;
+		case 'z':
+			zflag++;
+			break;
+		case '?':
+		default:
+			errflg++;
+			break;
+		}
+
+	if (errflg) {
+		(void) fprintf(stderr, USAGE, progname);
+		exit(2);
+	}
+
+	if (!app) {
+		ret = apprentice(magicfile, check);
+		if (check)
+			exit(ret);
+		app = 1;
+	}
+
+	if (optind == argc) {
+		if (!didsomefiles) {
+			(void)fprintf(stderr, USAGE, progname);
+			exit(2);
+		}
+	}
+	else {
+		int i, wid, nw;
+		for (wid = 0, i = optind; i < argc; i++) {
+			nw = strlen(argv[i]);
+			if (nw > wid)
+				wid = nw;
+		}
+		for (; optind < argc; optind++)
+			process(argv[optind], wid);
+	}
+
+	return 0;
+}
+
+
+/*
+ * unwrap -- read a file of filenames, do each one.
+ */
+static void
+unwrap(fn)
+char *fn;
+{
+	char buf[MAXPATHLEN];
+	FILE *f;
+	int wid = 0, cwid;
+
+	if ((f = fopen(fn, "r")) == NULL) {
+		error("Cannot open `%s' (%s).\n", fn, strerror(errno));
+		/*NOTREACHED*/
+	}
+
+	while (fgets(buf, MAXPATHLEN, f) != NULL) {
+		cwid = strlen(buf) - 1;
+		if (cwid > wid)
+			wid = cwid;
+	}
+
+	rewind(f);
+
+	while (fgets(buf, MAXPATHLEN, f) != NULL) {
+		buf[strlen(buf)-1] = '\0';
+		process(buf, wid);
+	}
+
+	(void) fclose(f);
+}
+
+
+/*
+ * process - process input file
+ */
+void
+process(inname, wid)
+const char	*inname;
+int wid;
+{
+	int	fd = 0;
+	static  const char stdname[] = "standard input";
+	unsigned char	buf[HOWMANY+1];	/* one extra for terminating '\0' */
+	struct utimbuf  utbuf;
+	struct stat	sb;
+	int nbytes = 0;	/* number of bytes read from a datafile */
+	char match = '\0';
+
+	if (strcmp("-", inname) == 0) {
+		if (fstat(0, &sb)<0) {
+			error("cannot fstat `%s' (%s).\n", stdname,
+			      strerror(errno));
+			/*NOTREACHED*/
+		}
+		inname = stdname;
+	}
+
+	if (wid > 0)
+	     (void) printf("%s:%*s ", inname, 
+			   (int) (wid - strlen(inname)), "");
+
+	if (inname != stdname) {
+	    /*
+	     * first try judging the file based on its filesystem status
+	     */
+	    if (fsmagic(inname, &sb) != 0) {
+		    putchar('\n');
+		    return;
+	    }
+
+	    if ((fd = open(inname, O_RDONLY)) < 0) {
+		    /* We can't open it, but we were able to stat it. */
+		    if (sb.st_mode & 0002) ckfputs("writeable, ", stdout);
+		    if (sb.st_mode & 0111) ckfputs("executable, ", stdout);
+		    ckfprintf(stdout, "can't read `%s' (%s).\n",
+			inname, strerror(errno));
+		    return;
+	    }
+	}
+
+
+	/*
+	 * try looking at the first HOWMANY bytes
+	 */
+	if ((nbytes = read(fd, (char *)buf, HOWMANY)) == -1) {
+		error("read failed (%s).\n", strerror(errno));
+		/*NOTREACHED*/
+	}
+
+	if (nbytes == 0)
+		ckfputs("empty", stdout);
+	else {
+		buf[nbytes++] = '\0';	/* null-terminate it */
+		match = tryit(buf, nbytes, zflag);
+	}
+#ifdef __ELF__
+	/*
+	 * ELF executables have multiple section headers in arbitrary
+	 * file locations and thus file(1) cannot determine it from easily.
+	 * Instead we traverse thru all section headers until a symbol table
+	 * one is found or else the binary is stripped.
+	 * XXX: This will not work for binaries of a different byteorder.
+	 *	Should come up with a better fix.
+	 */
+
+	if (match == 's' && nbytes > sizeof (Elf32_Ehdr) &&
+	    buf[EI_MAG0] == ELFMAG0 &&
+	    buf[EI_MAG1] == ELFMAG1 &&
+	    buf[EI_MAG2] == ELFMAG2 &&
+	    buf[EI_MAG3] == ELFMAG3) {
+
+		union {
+			long l;
+			char c[sizeof (long)];
+		} u;
+		Elf32_Ehdr elfhdr;
+		int stripped = 1;
+
+		u.l = 1;
+		(void) memcpy(&elfhdr, buf, sizeof elfhdr);
+
+		/*
+		 * If the system byteorder does not equal the object byteorder
+		 * then don't test.
+		 */
+		if ((u.c[sizeof(long) - 1] + 1) == elfhdr.e_ident[5]) {
+		    if (lseek(fd, elfhdr.e_shoff, SEEK_SET)<0)
+			error("lseek failed (%s).\n", strerror(errno));
+
+		    for ( ; elfhdr.e_shnum ; elfhdr.e_shnum--) {
+			if (read(fd, buf, elfhdr.e_shentsize)<0)
+			    error("read failed (%s).\n", strerror(errno));
+			if (((Elf32_Shdr *)&buf)->sh_type == SHT_SYMTAB) {
+			    stripped = 0;
+			    break;
+			}
+		    }
+		    if (stripped)
+			(void) printf (", stripped");
+		}
+	}
+#endif
+
+	if (inname != stdname)
+		(void) close(fd);
+	(void) putchar('\n');
+}
+
+
+int
+tryit(buf, nb, zflag)
+unsigned char *buf;
+int nb, zflag;
+{
+	/* try compression stuff */
+	if (zflag && zmagic(buf, nb))
+		return 'z';
+
+	/* try tests in /etc/magic (or surrogate magic file) */
+	if (softmagic(buf, nb))
+		return 's';
+
+	/* try known keywords, check whether it is ASCII */
+	if (ascmagic(buf, nb))
+		return 'a';
+
+	/* abandon hope, all ye who remain here */
+	ckfputs("data", stdout);
+		return '\0';
+}