Will the real od.c please stand up! (my previous commit was a mistake)

1 files changed, 230 insertions, 64 deletions

diff --git a/coreutils/od.c b/coreutils/od.c
index 471bae4..6187cad 100644
--- a/coreutils/od.c
+++ b/coreutils/od.c
@@ -1,9 +1,9 @@
 /*
- * Mini xargs implementation for busybox
+ * od implementation for busybox
+ * Based on code from util-linux v 2.11l
  *
- * Copyright (C) 1999,2000 by Lineo, inc. and Erik Andersen
- * Copyright (C) 1999,2000,2001 by Erik Andersen <andersee@debian.org>
- * Remixed by Mark Whitley <markw@codepoet.org>
+ * Copyright (c) 1990
+ *	The Regents of the University of California.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -19,88 +19,254 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  *
+ * Original copyright notice is retained at the end of this file.
  */
 
-#include <stdio.h>
+#include <ctype.h>
+#include <getopt.h>
 #include <stdlib.h>
-#include <string.h>
+#include "dump.h"
 #include "busybox.h"
 
-int xargs_main(int argc, char **argv)
+extern FS *fshead;				/* head of format strings */
+extern int blocksize;				/* data block size */
+extern int length;			/* max bytes to read */
+
+#define	ishexdigit(c) \
+	((c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F'))
+
+static void
+odoffset(int argc, char ***argvp)
 {
-	char *cmd_to_be_executed;
-	char *file_to_act_on;
-	int i;
-	int len;
+	extern off_t skip;
+	register char *num, *p;
+	int base;
+	char *end;
 
 	/*
-	 * No options are supported in this version of xargs; no getopt.
+	 * The offset syntax of od(1) was genuinely bizarre.  First, if
+	 * it started with a plus it had to be an offset.  Otherwise, if
+	 * there were at least two arguments, a number or lower-case 'x'
+	 * followed by a number makes it an offset.  By default it was
+	 * octal; if it started with 'x' or '0x' it was hex.  If it ended
+	 * in a '.', it was decimal.  If a 'b' or 'B' was appended, it
+	 * multiplied the number by 512 or 1024 byte units.  There was
+	 * no way to assign a block count to a hex offset.
 	 *
-	 * Re: The missing -t flag: Most programs that produce output also print
-	 * the filename, so xargs doesn't really need to do it again. Supporting
-	 * the -t flag =greatly= bloats up the size of this app and the memory it
-	 * uses because you have to buffer all the input file strings in memory. If
-	 * you really want to see the filenames that xargs will act on, just run it
-	 * once with no args and xargs will echo the filename. Simple.
+	 * We assumes it's a file if the offset is bad.
 	 */
+	p = **argvp;
 
-	argv++;
-	len = argc;     /* arg = count for ' ' + trailing '\0' */
-	/* Store the command to be executed (taken from the command line) */
-	if (argc == 1) {
-		/* default behavior is to echo all the filenames */
-		argv[0] = "/bin/echo";
-		len++;  /* space for trailing '\0' */
-	} else {
-		argc--;
-		}
-	/* concatenate all the arguments passed to xargs together */
-	for (i = 0; i < argc; i++)
-		len += strlen(argv[i]);
-	cmd_to_be_executed = xmalloc (len);
-	for (i = len = 0; i < argc; i++) {
-		len = sprintf(cmd_to_be_executed + len, "%s ", argv[i]);
+	if (!p) {
+		/* hey someone is probably piping to us ... */
+		return;
 	}
 
-	/* Now, read in one line at a time from stdin, and store this 
-	 * line to be used later as an argument to the command */
-	while ((file_to_act_on = get_line_from_file(stdin)) !=NULL) {
+	if (*p != '+' && (argc < 2 ||
+	    (!isdigit(p[0]) && (p[0] != 'x' || !ishexdigit(p[1])))))
+		return;
+
+	base = 0;
+	/*
+	 * skip over leading '+', 'x[0-9a-fA-f]' or '0x', and
+	 * set base.
+	 */
+	if (p[0] == '+')
+		++p;
+	if (p[0] == 'x' && ishexdigit(p[1])) {
+		++p;
+		base = 16;
+	} else if (p[0] == '0' && p[1] == 'x') {
+		p += 2;
+		base = 16;
+	}
 
-		FILE *cmd_output;
-		char *output_line;
-		char *execstr;
+	/* skip over the number */
+	if (base == 16)
+		for (num = p; ishexdigit(*p); ++p);
+	else
+		for (num = p; isdigit(*p); ++p);
 
-		/* eat the newline off the filename. */
-		chomp(file_to_act_on);
+	/* check for no number */
+	if (num == p)
+		return;
 
-		/* eat blank lines */
-		if (file_to_act_on[0] == 0)
-			continue;
+	/* if terminates with a '.', base is decimal */
+	if (*p == '.') {
+		if (base)
+			return;
+		base = 10;
+	}
 
-		/* assemble the command and execute it */
-		bb_asprintf(&execstr, "%s%s", cmd_to_be_executed, file_to_act_on);
-		
-		cmd_output = popen(execstr, "r");
-		if (cmd_output == NULL)
-			perror_msg_and_die("popen");
+	skip = strtol(num, &end, base ? base : 8);
 
-		/* harvest the output */
-		while ((output_line = get_line_from_file(cmd_output)) != NULL) {
-			fputs(output_line, stdout);
-			free(output_line);
+	/* if end isn't the same as p, we got a non-octal digit */
+	if (end != p)
+		skip = 0;
+	else {
+		if (*p) {
+			if (*p == 'b')
+				skip *= 512;
+			else if (*p == 'B')
+				skip *= 1024;
+			++p;
+		}
+		if (*p)
+			skip = 0;
+		else {
+			++*argvp;
+			/*
+			 * If the offset uses a non-octal base, the base of
+			 * the offset is changed as well.  This isn't pretty,
+			 * but it's easy.
+			 */
+#define	TYPE_OFFSET	7
+			if (base == 16) {
+				fshead->nextfu->fmt[TYPE_OFFSET] = 'x';
+				fshead->nextfs->nextfu->fmt[TYPE_OFFSET] = 'x';
+			} else if (base == 10) {
+				fshead->nextfu->fmt[TYPE_OFFSET] = 'd';
+				fshead->nextfs->nextfu->fmt[TYPE_OFFSET] = 'd';
+			}
 		}
+	}
+}
 
-		/* clean up */
-		pclose(cmd_output);
-		free(execstr);
-		free(file_to_act_on);
+static void odprecede(void)
+{
+	static int first = 1;
+
+	if (first) {
+		first = 0;
+		add("\"%07.7_Ao\n\"");
+		add("\"%07.7_ao  \"");
+	} else
+		add("\"         \"");
+}
+
+int od_main(int argc, char **argv)
+{
+	int ch;
+	extern enum _vflag vflag;
+	vflag = FIRST;
+	length = -1;
+
+	while ((ch = getopt(argc, argv, "aBbcDdeFfHhIiLlOoPpswvXx")) != EOF)
+		switch (ch) {
+		case 'a':
+			odprecede();
+			add("16/1 \"%3_u \" \"\\n\"");
+			break;
+		case 'B':
+		case 'o':
+			odprecede();
+			add("8/2 \" %06o \" \"\\n\"");
+			break;
+		case 'b':
+			odprecede();
+			add("16/1 \"%03o \" \"\\n\"");
+			break;
+		case 'c':
+			odprecede();
+			add("16/1 \"%3_c \" \"\\n\"");
+			break;
+		case 'd':
+			odprecede();
+			add("8/2 \"  %05u \" \"\\n\"");
+			break;
+		case 'D':
+			odprecede();
+			add("4/4 \"     %010u \" \"\\n\"");
+			break;
+		case 'e':		/* undocumented in od */
+		case 'F':
+			odprecede();
+			add("2/8 \"          %21.14e \" \"\\n\"");
+			break;
+			
+		case 'f':
+			odprecede();
+			add("4/4 \" %14.7e \" \"\\n\"");
+			break;
+		case 'H':
+		case 'X':
+			odprecede();
+			add("4/4 \"       %08x \" \"\\n\"");
+			break;
+		case 'h':
+		case 'x':
+			odprecede();
+			add("8/2 \"   %04x \" \"\\n\"");
+			break;
+		case 'I':
+		case 'L':
+		case 'l':
+			odprecede();
+			add("4/4 \"    %11d \" \"\\n\"");
+			break;
+		case 'i':
+			odprecede();
+			add("8/2 \" %6d \" \"\\n\"");
+			break;
+		case 'O':
+			odprecede();
+			add("4/4 \"    %011o \" \"\\n\"");
+			break;
+		case 'v':
+			vflag = ALL;
+			break;
+		case 'P':
+		case 'p':
+		case 's':
+		case 'w':
+		case '?':
+		default:
+			error_msg("od: od(1) has been deprecated for hexdump(1).\n");
+			if (ch != '?') {
+				error_msg("od: hexdump(1) compatibility doesn't support the -%c option%s\n",
+				    ch, ch == 's' ? "; see strings(1)." : ".");
+			}
+			show_usage();
+		}
+
+	if (!fshead) {
+		add("\"%07.7_Ao\n\"");
+		add("\"%07.7_ao  \" 8/2 \"%06o \" \"\\n\"");
 	}
 
-#ifdef CONFIG_FEATURE_CLEAN_UP
-	free(cmd_to_be_executed);
-#endif
+	argc -= optind;
+	argv += optind;
+
+	odoffset(argc, &argv);
 
-	return 0;
+	return(dump(argv));
 }
 
-/* vi: set sw=4 ts=4: */
+/*-
+ * Copyright (c) 1990 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.
+ */