# HG changeset patch
# User Rob Landley <rob@landley.net>
# Date 1419362987 21600
# Node ID f67b1e9e91b4a6c0ffb32b96a6524d6a0f19290b
# Parent  45fb262230c995993fab125fe395a3b0cb2db1e1
Merge catv back into cat as discussed on the list. Add comments about infrastructure upgrades needed to restore separate catv option.

diff -r 45fb262230c9 -r f67b1e9e91b4 toys/other/catv.c
--- a/toys/other/catv.c	Mon Dec 22 17:04:47 2014 -0600
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,67 +0,0 @@
-/* cat -v implementation for toybox
- *
- * Copyright (C) 2006, 2007 Rob Landley <rob@landley.net>
- *
- * See "Cat -v considered harmful" at
- *   http://cm.bell-labs.com/cm/cs/doc/84/kp.ps.gz
-
-USE_CATV(NEWTOY(catv, "vte", TOYFLAG_USR|TOYFLAG_BIN))
-
-config CATV
-  bool "catv"
-  default y
-  help
-    usage: catv [-evt] [filename...]
-
-    Display nonprinting characters as escape sequences. Use M-x for
-    high ascii characters (>127), and ^x for other nonprinting chars.
-
-    -e	Mark each newline with $
-    -t	Show tabs as ^I
-    -v	Don't use ^x or M-x escapes.
-*/
-
-#define FOR_catv
-#include "toys.h"
-
-// Callback function for loopfiles()
-
-static void do_catv(int fd, char *name)
-{
-  for(;;) {
-    int i, len;
-
-    len = read(fd, toybuf, sizeof(toybuf));
-    if (len < 0) toys.exitval = EXIT_FAILURE;
-    if (len < 1) break;
-    for (i=0; i<len; i++) {
-      char c=toybuf[i];
-
-      if (c > 126 && (toys.optflags & FLAG_v)) {
-        if (c > 127) {
-          printf("M-");
-          c -= 128;
-        }
-        if (c == 127) {
-          printf("^?");
-          continue;
-        }
-      }
-      if (c < 32) {
-        if (c == 10) {
-          if (toys.optflags & FLAG_e) xputc('$');
-        } else if (toys.optflags & (c==9 ? FLAG_t : FLAG_v)) {
-          printf("^%c", c+'@');
-          continue;
-        }
-      }
-      xputc(c);
-    }
-  }
-}
-
-void catv_main(void)
-{
-  toys.optflags ^= FLAG_v;
-  loopfiles(toys.optargs, do_catv);
-}
diff -r 45fb262230c9 -r f67b1e9e91b4 toys/posix/cat.c
--- a/toys/posix/cat.c	Mon Dec 22 17:04:47 2014 -0600
+++ b/toys/posix/cat.c	Tue Dec 23 13:29:47 2014 -0600
@@ -3,8 +3,12 @@
  * Copyright 2006 Rob Landley <rob@landley.net>
  *
  * See http://opengroup.org/onlinepubs/9699919799/utilities/cat.html
+ *
+ * And "Cat -v considered harmful" at
+ *   http://cm.bell-labs.com/cm/cs/doc/84/kp.ps.gz
 
-USE_CAT(NEWTOY(cat, "u", TOYFLAG_BIN))
+USE_CAT(NEWTOY(cat, "u"USE_CAT_V("vte"), TOYFLAG_BIN))
+#USE_CATV(NEWTOY(catv, USE_CATV("vte"), TOYFLAG_USR|TOYFLAG_BIN))
 
 config CAT
   bool "cat"
@@ -16,19 +20,76 @@
     Filename "-" is a synonym for stdin.
 
     -u	Copy one byte at a time (slow).
+
+config CAT_V
+  bool "cat -etv"
+  default y
+  depends on CAT
+  help
+    usage: cat [-evt]
+
+    Display nonprinting characters as escape sequences. Use M-x for
+
+    -e	Mark each newline with $
+    -t	Show tabs as ^I
+    -v	Display nonprinting characters as escape sequences. Use M-x for
+    	high ascii characters (>127), and ^x for other nonprinting chars.
 */
 
+/*
+todo:
+
+config CATV
+  bool "catv"
+  default y
+  depends on !CAT_V
+  help
+    usage: catv [-evt] [filename...]
+
+    Display nonprinting characters as escape sequences. Use M-x for
+    high ascii characters (>127), and ^x for other nonprinting chars.
+
+    -e  Mark each newline with $
+    -t  Show tabs as ^I
+    -v  Don't use ^x or M-x escapes.
+*/
+
+#define FOR_cat
 #include "toys.h"
 
 static void do_cat(int fd, char *name)
 {
-  int len, size=toys.optflags ? 1 : sizeof(toybuf);
+  int i, len, size=(toys.optflags & FLAG_u) ? 1 : sizeof(toybuf);
 
-  for (;;) {
+  for(;;) {
     len = read(fd, toybuf, size);
-    if (len<0) perror_msg("%s",name);
-    if (len<1) break;
-    xwrite(1, toybuf, len);
+    if (len < 0) toys.exitval = EXIT_FAILURE;
+    if (len < 1) break;
+    if (CFG_CAT_V && (toys.optflags&~FLAG_u)) {
+      for (i=0; i<len; i++) {
+        char c=toybuf[i];
+
+        if (c > 126 && (toys.optflags & FLAG_v)) {
+          if (c > 127) {
+            printf("M-");
+            c -= 128;
+          }
+          if (c == 127) {
+            printf("^?");
+            continue;
+          }
+        }
+        if (c < 32) {
+          if (c == 10) {
+            if (toys.optflags & FLAG_e) xputc('$');
+          } else if (toys.optflags & (c==9 ? FLAG_t : FLAG_v)) {
+            printf("^%c", c+'@');
+            continue;
+          }
+        }
+        xputc(c);
+      }
+    } else xwrite(1, toybuf, len);
   }
 }
 
@@ -36,3 +97,15 @@
 {
   loopfiles(toys.optargs, do_cat);
 }
+
+//todo:
+//void catv_main(void)
+//{
+//  toys.optflags ^= FLAG_v;
+//  loopfiles(toys.optargs, do_catv);
+//}
+
+// The common infrastructure is testing FLAG_h which is only defined in cat
+// context (not catv), but catv can't use cat's flag context if cat is disabled
+// and its flags are zero. Need to upgrade flag parsing infrastructure so
+// defining FORCE_FLAGS along with FOR_command doesn't zero unused flag macros.