Turned some #define constants into static const ints.

[oweals/busybox.git] / echo.c

diff --git a/echo.c b/echo.c
index 387ea3fefc5673427a194051800085dd0e78f8f2..393f4425f5a86244d3fe12b1d1947e8b47a4a176 100644 (file)
--- a/echo.c
+++ b/echo.c
@@ -22,64 +22,92 @@
  * Original copyright notice is retained at the end of this file.
  */
 
-#include "internal.h"
+#include "busybox.h"
 #include <stdio.h>
 
-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
-       ;
-
 extern int 
 echo_main(int argc, char** argv)
 {
-       register char **ap;
-       char *p;
-       register char c;
        int nflag = 0;
        int eflag = 0;
 
+       /* Skip argv[0]. */
+       argc--;
+       argv++;
+
+       while (argc > 0 && *argv[0] == '-')
+       {
+               register char *temp;
+               register int index;
+
+               /*
+                * 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.
+                */
+               temp = argv[0] + 1;
+
+               for (index = 0; temp[index]; index++)
+               {
+                       if (strrchr("neE", temp[index]) == 0)
+                               goto just_echo;
+               }
+
+               if (!*temp)
+                       goto just_echo;
 
-       while ((c = getopt(argc, argv, "neE")) != EOF) {
-               switch (c) {
-               case 'n': 
-                       nflag = 1;
-                       break;
-               case 'e':
-                       eflag = 1;
-                       break;
-               case 'E':
-                       eflag = 0;
-                       break;
-               default: 
-                       usage(uname_usage);
+               /*
+                * All of the options in temp are valid options to echo.
+                * Handle them.
+                */
+               while (*temp)
+               {
+                       if (*temp == 'n')
+                               nflag = 1;
+                       else if (*temp == 'e')
+                               eflag = 1;
+                       else if (*temp == 'E')
+                               eflag = 0;
+                       else
+                               goto just_echo;
+
+                       temp++;
                }
+               argc--;
+               argv++;
        }
 
-       ap = &argv[optind];
-       while ((p = *ap++) != NULL) {
-               while ((c = *p++) != '\0') {
-                       if (c == '\\' && eflag) {
-                               if (*p == 'c')
-                                       exit(0);
-                               else
-                                       c = process_escape_sequence(&p);
+just_echo:
+       while (argc > 0) {
+               char *arg = argv[0];
+               register int c;
+
+               while ((c = *arg++)) {
+
+                       /* Check for escape sequence. */
+                       if (c == '\\' && eflag && *arg) {
+                               if (*arg == 'c') {
+                                       /* '\c' means cancel newline. */
+                                       nflag = 1;
+                                       arg++;
+                                       continue;
+                               } else {
+                                       c = process_escape_sequence(&arg);
+                               }
                        }
+
                        putchar(c);
                }
-               if (*ap)
+               argc--;
+               argv++;
+               if (argc > 0)
                        putchar(' ');
        }
-       if (! nflag)
+       if (!nflag)
                putchar('\n');
        fflush(stdout);
-       return( 0);
+
+       return EXIT_SUCCESS;
 }
 
 /*-
@@ -97,9 +125,10 @@ 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
@@ -119,5 +148,3 @@ echo_main(int argc, char** argv)
  *
  *     @(#)echo.c      8.1 (Berkeley) 5/31/93
  */
-
-