How can I make GDB print a string literally (without escaping)?

Question

I have a big, long string that I want to capture to a file. I can use logging to get most of the way there:

set logging on
set logging file gdb.log

…but if I use p or x/s to print the string, quotes and junk are all escaped. How can I get the string as-is?

HCSF · Accepted Answer · 2021-07-27 16:14:40Z

8

For a really large string you can also use:

(gdb) set variable $s = MY_STRING
(gdb) dump binary memory FILE $s $s + (size_t)strlen($s)

which can be easily adapted to handle buffers with null bytes. Also the content of FILE would never contain anything other than the string.

edited Jul 27, 2021 at 16:14

HCSF

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answered Dec 24, 2012 at 18:52

scottt

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Comments

s4y · Accepted Answer · 2012-12-21 23:09:45Z

7

Ah, I totally forgot about printf:

printf "%s\n", some_string

answered Dec 21, 2012 at 23:09

s4y

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2 Comments

Mark E. Haase Over a year ago

Neat idea, but I can't figure out how to redirect this into a file.

shakurov Over a year ago

@mehaase, simple: set logging file str_dump.txt set logging on set logging redirect on The first two lines instruct gdb to write output to the file (in addition to writing to the terminal), the last line disables output to the terminal.

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