Promote xxd to other.

1 files changed, 65 insertions, 0 deletions

diff --git a/toys/other/xxd.c b/toys/other/xxd.c
new file mode 100644
index 00000000..e9ad8393
--- /dev/null
+++ b/toys/other/xxd.c
@@ -0,0 +1,65 @@
+/* xxd.c - hexdump.
+ *
+ * Copyright 2015 The Android Open Source Project
+ *
+ * No obvious standard, output looks like:
+ * 0000000: 4c69 6e75 7820 7665 7273 696f 6e20 332e  Linux version 3.
+ *
+ * TODO: support for reversing a hexdump back into the original data.
+ * TODO: -s seek
+
+USE_XXD(NEWTOY(xxd, ">1c#<1>4096=16l#g#<1=2", TOYFLAG_USR|TOYFLAG_BIN))
+
+config XXD
+  bool "xxd"
+  default y
+  help
+    usage: xxd [-c n] [-g n] [-l n] [file]
+
+    Hexdump a file to stdout.  If no file is listed, copy from stdin.
+    Filename "-" is a synonym for stdin.
+
+    -c n	Show n bytes per line (default 16).
+    -g n	Group bytes by adding a ' ' every n bytes (default 2).
+    -l n	Limit of n bytes before stopping (default is no limit).
+*/
+
+#define FOR_xxd
+#include "toys.h"
+
+GLOBALS(
+  long g;
+  long l;
+  long c;
+)
+
+static void do_xxd(int fd, char *name)
+{
+  long long pos = 0;
+  int i, len, space;
+
+  while (0<(len = readall(fd, toybuf, (TT.l && TT.l-pos<TT.c)?TT.l-pos:TT.c))) {
+    printf("%08llx: ", pos);
+    pos += len;
+    space = 2*TT.c+TT.c/TT.g+1;
+
+    for (i=0; i<len;) {
+      space -= printf("%02x", toybuf[i]);
+      if (!(++i%TT.g)) {
+        putchar(' ');
+        space--;
+      }
+    }
+
+    printf("%*s", space, "");
+    for (i=0; i<len; i++)
+      putchar((toybuf[i]>=' ' && toybuf[i]<='~') ? toybuf[i] : '.');
+    putchar('\n');
+  }
+  if (len<0) perror_exit("read");
+}
+
+void xxd_main(void)
+{
+  loopfiles(toys.optargs, do_xxd);
+}