CODEWITHSUNDEEP
gdb
user3542317
user3542317

Reputation: 313

GDB command line interface error: Unrecognized escape character \x in format string

I have a small program that can ask users for some input (in essence just the gets function). Now, I want to play around with the input a little bit. I run the program with gdb and I want to insert bytes in hexadecimal format in the gdb prompt.

The way I tried to do it on the gdb command line interface is like so:

(gdb) printf "\x20\x20" | ./program

But that results in the error: 

Unrecognized escape character \x in format string.

If I do the same in the shell without the gdb prompt its working. What am I doing wrong?

Thanks :)

Upvotes: 0

Views: 730

Answers (1)

Tom Tromey
Tom Tromey

Reputation: 22529

You aren't doing anything wrong -- it is just a missing feature of gdb. You could file a bug report.

A workaround is:

(gdb) printf "%c", 0x20

Upvotes: 1

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