CRANGLER(1)

NAME
crangler - C source transformation

SYNOPSIS
crangler [-?] [-h] [--help] crangler file.json

DESCRIPTION
crangler is a command-line utility that makes changes to a preprocessed C file that are prescribed in a JSON configuration file. The supported transformations are:

    Add a contract (pre/post/assigns) to a named C function.

    Add a loop contract to a loop identified by the name of the function containing the loop and a loop number.

    Remove the static storage classifier from a function or a variable.

    Replace a function call by a call to a stub.

The resulting source file is written to standard output or to a file specified in the JSON configuration.

EXAMPLE
The following JSON configuration file makes crangler preprocess remove_static1.c. While processing this file to produce a preprocessed result, no non-standard include paths or defines reqired. Transformations configured here are removing the static storage classifier from all functions matching the regular expression foobar[12], and replacing calls to bar by calls to a function called bar_stub. No objects are listed that require transformation. The result is written to standard output.
    {
      "sources": [
        "remove_static1.c"
      ],
      "includes": [],
      "defines": [],
      "functions": [
        {
          "foobar[12]": [
            "remove static"
          ],
          "bar": [
            "stub bar_stub"
          ]
        }
      ],
      "objects": [],
      "output": "stdout"
    }

ENVIRONMENT
All tools honor the TMPDIR environment variable when generating temporary files and directories.

BUGS
If you encounter a problem please create an issue at https://github.com/diffblue/cbmc/issues

COPYRIGHT
2021, Daniel Kroening