X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=coreutils%2Fecho.c;h=539640fb0052eb3d42f05324d8d05f706db86a15;hb=5cfa5ef6f358bb979b76f8927899b920074f698d;hp=6e279d1c6d332431249039bc7909ed76be635049;hpb=f7cf2f7ef98077c59e4da4bc25de38c22174ac9d;p=oweals%2Fbusybox.git

diff --git a/coreutils/echo.c b/coreutils/echo.c
index 6e279d1c6..539640fb0 100644
--- a/coreutils/echo.c
+++ b/coreutils/echo.c
@@ -22,63 +22,107 @@
  * Original copyright notice is retained at the end of this file.
  */
 
-#include "internal.h"
-#include <stdio.h>
+/* BB_AUDIT SUSv3 compliant -- unless configured as fancy echo. */
+/* http://www.opengroup.org/onlinepubs/007904975/utilities/echo.html */
 
-static const char uname_usage[] =
-	"echo [-neE] [ARG ...]\n"
-#ifndef BB_FEATURE_TRIVIAL_HELP
-	"\nPrints the specified ARGs to stdout\n\n"
-	"Options:\n"
-	"\t-n\tsuppress trailing newline\n"
-	"\t-e\tinterpret backslash-escaped characters (i.e. \\t=tab etc)\n"
-	"\t-E\tdisable interpretation of backslash-escaped characters\n"
-#endif
-	;
+/* Mar 16, 2003      Manuel Novoa III   (mjn3@codepoet.org)
+ *
+ * Because of behavioral differences, implemented configurable SUSv3
+ * or 'fancy' gnu-ish behaviors.  Also, reduced size and fixed bugs.
+ * 1) In handling '\c' escape, the previous version only suppressed the
+ *     trailing newline.  SUSv3 specifies _no_ output after '\c'.
+ * 2) SUSv3 specifies that octal escapes are of the form \0{#{#{#}}}.
+ *    The previous version version did not allow 4-digit octals.
+ */
 
-extern int 
-echo_main(int argc, char** argv)
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include "busybox.h"
+
+extern int echo_main(int argc, char** argv)
 {
-	register char **ap;
-	char *p;
-	register char c;
-	int nflag = 0;
+#ifndef CONFIG_FEATURE_FANCY_ECHO
+#define eflag '\\'
+	++argv;
+#else
+	const char *p;
+	int nflag = 1;
 	int eflag = 0;
 
-	ap = argv;
-	if (argc)
-		ap++;
-	while ((p = *ap) != NULL && *p == '-') {
-		if (strcmp(p, "-n")==0) {
-			nflag = 1;
-		} else if (strcmp(p, "-e")==0) {
-			eflag = 1;
-		} else if (strcmp(p, "-E")==0) {
-			eflag = 0;
+	while (*++argv && (**argv == '-')) {
+		/* If it appears that we are handling options, then make sure
+		 * that all of the options specified are actually valid.
+		 * Otherwise, the string should just be echoed.
+		 */
+
+		if (!*(p = *argv + 1)) {	/* A single '-', so echo it. */
+			goto just_echo;
 		}
-		else if (strncmp(p, "--", 2)==0) {
-			usage( uname_usage);
-		} 
-		else break;
-		ap++;
+
+		do {
+			if (strrchr("neE", *p) == 0) {
+				goto just_echo;
+			}
+		} while (*++p);
+
+		/* All of the options in this arg are valid, so handle them. */
+		p = *argv + 1;
+		do {
+			if (*p == 'n') {
+				nflag = 0;
+			} else if (*p == 'e') {
+				eflag = '\\';
+			} else {
+				eflag = 0;
+			}
+		} while (*++p);
 	}
-	while ((p = *ap++) != NULL) {
-		while ((c = *p++) != '\0') {
-			if (c == '\\' && eflag) {
-				if (*p == 'c')
-					exit(0);
-				else
-					c = process_escape_sequence(&p);
+
+just_echo:
+#endif
+	while (*argv) {
+		register int c;
+
+		while ((c = *(*argv)++)) {
+			if (c == eflag) {	/* Check for escape seq. */
+				if (**argv == 'c') {
+					/* '\c' means cancel newline and
+					 * ignore all subsequent chars. */
+					goto DONE;
+				}
+#ifndef CONFIG_FEATURE_FANCY_ECHO
+				/* SUSv3 specifies that octal escapes must begin with '0'. */
+				if (((unsigned int)(**argv - '1')) >= 7)
+#endif
+				{
+					/* Since SUSv3 mandates a first digit of 0, 4-digit octals
+					* of the form \0### are accepted. */
+					if ((**argv == '0') && (((unsigned int)(argv[0][1] - '0')) < 8)) {
+						(*argv)++;
+					}
+					/* bb_process_escape_sequence can handle nul correctly */
+					c = bb_process_escape_sequence((const char **) argv);
+				}
 			}
 			putchar(c);
 		}
-		if (*ap)
+
+		if (*++argv) {
 			putchar(' ');
+		}
 	}
-	if (! nflag)
+
+#ifdef CONFIG_FEATURE_FANCY_ECHO
+	if (nflag) {
 		putchar('\n');
-	fflush(stdout);
-	return( 0);
+	}
+#else
+	putchar('\n');
+#endif
+
+DONE:
+	bb_fflush_stdout_and_exit(EXIT_SUCCESS);
 }
 
 /*-
@@ -96,9 +140,10 @@ echo_main(int argc, char** argv)
  * 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. All advertising materials mentioning features or use of this software
- *    must display the following acknowledgement:
- *	This product includes software developed by the University of
+ *
+ * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
+ *		ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
+ *
  *	California, Berkeley and its contributors.
  * 4. Neither the name of the University nor the names of its contributors
  *    may be used to endorse or promote products derived from this software
@@ -118,5 +163,3 @@ echo_main(int argc, char** argv)
  *
  *	@(#)echo.c	8.1 (Berkeley) 5/31/93
  */
-
-