OnWorks favicon

cproto - Online in the Cloud

Run cproto in OnWorks free hosting provider over Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

This is the command cproto that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator



cproto - generate C function prototypes and convert function definitions


cproto [ option ... ] [ file ... ]


Cproto generates function prototypes for functions defined in the specified C source files
to the standard output. The function definitions may be in the old style or ANSI C style.
Optionally, cproto also outputs declarations for variables defined in the files. If no
file argument is given, cproto reads its input from the standard input.

By giving a command line option, cproto will also convert function definitions in the
specified files from the old style to the ANSI C style. The original source files along
with files specified by
#include "file"
directives appearing in the source code will be overwritten with the converted code. If
no file names are given on the command line, then the program reads the source code from
the standard input and outputs the converted source to the standard output.

If any comments appear in the parameter declarations for a function definition, such as in
the example,
main (argc, argv)
int argc; /* number of arguments */
char *argv[]; /* arguments */
then the converted function definition will have the form
main (
int argc, /* number of arguments */
char *argv[] /* arguments */
Otherwise, the converted function definition will look like
main (int argc, char *argv[])

Cproto can optionally convert function definitions from the ANSI style to the old style.
In this mode, the program also converts function declarators and prototypes that appear
outside function bodies. This is not a complete ANSI C to old C conversion. The program
does not change anything within function bodies.

Cproto can optionally generate source in lint-library format. This is useful in
environments where the lint utility is used to supplement prototype checking of your


-e Output the keyword extern in front of every generated prototype or declaration that
has global scope.

-f n Set the style of generated function prototypes where n is a number from 0 to 3.
For example, consider the function definition
main (argc, argv)
int argc;
char *argv[];
If the value is 0, then no prototypes are generated. When set to 1, the output is:
int main(/*int argc, char *argv[]*/);
For a value of 2, the output has the form:
int main(int /*argc*/, char */*argv*/[]);
The default value is 3. It produces the full function prototype:
int main(int argc, char *argv[]);

-l Generate text for a lint-library (overrides the "-f" option). The output includes
the comment
Special comments LINT_EXTERN and LINT_PREPRO (a la "VARARGS") respectively turn on
the "-x" option and copy comment-text to the output (for preprocessing in lint).
Use the comment
to include externs defined in the first level of include-files. Use the comment
to cause cproto to put "#undef" directives before each lint library declaration
(i.e., to avoid conflicts with macros that happen to have to have the same name as
the functions, thus causing syntax errors).

Note that these special comments are not supported under VAX/VMS, since there is no
equivalent for the "-C" option of cpp with VAX-C.

-c The parameter comments in the prototypes generated by the -f1 and -f2 options are
omitted by default. Use this option to enable the output of these comments.

-m Put a macro around the parameter list of every generated prototype. For example:
int main P_((int argc, char *argv[]));

-M name
Set the name of the macro used to surround prototype parameter lists when option -m
is selected. The default is "P_".

-d Omit the definition of the prototype macro used by the -m option.

-o file
Specify the name of the output file (default: standard output).

-O file
Specify the name of the error file (default: standard error).

-p Disable promotion of formal parameters in old style function definitions. By
default, parameters of type char or short in old style function definitions are
promoted to type int in the function prototype or converted ANSI C function
definition. Parameters of type float get promoted to double as well.

-q Do not output any error messages when the program cannot read the file specified in
an #include directive.

-s By default, cproto only generates declarations for functions and variables having
global scope. This option will output static declarations as well.

-S Output only static declarations.

-i By default, cproto only generates declarations for functions and variables having
global scope. This option will output inline declarations as well.

-T Copy type definitions from each file. (Definitions in included-files are copied,
unlike the "-l" option).

-v Also output declarations for variables defined in the source.

-x This option causes procedures and variables which are declared "extern" to be
included in the output.

-X level
This option limits the include-file level from which declarations are extracted by
examining the preprocessor output.

-a Convert function definitions from the old style to the ANSI C style.

-t Convert function definitions from the ANSI C style to the traditional style.

-b Rewrite function definition heads to include both old style and new style
declarations separated by a conditional compilation directive. For example, the
program can generate this function definition:
#ifdef ANSI_FUNC

main (int argc, char *argv[])

main (argc, argv)
int argc;
char *argv[]

-B directive
Set the conditional compilation directive to output at the beginning of function
definitions generated by the -b option. The default is
#ifdef ANSI_FUNC

-P template
-F template
-C template
Set the output format for generated prototypes, function definitions, and function
definitions with parameter comments respectively. The format is specified by a
template in the form
" int f ( a, b )"
but you may replace each space in this string with any number of whitespace
characters. For example, the option
-F"int f(\n\ta,\n\tb\n\t)"
will produce
int main(
int argc,
char *argv[]

-D name[=value]
This option is passed through to the preprocessor and is used to define symbols for
use with conditionals such as #ifdef.

-U name
This option is passed through to the preprocessor and is used to remove any
definitions of this symbol.

-I directory
This option is passed through to the preprocessor and is used to specify a
directory to search for files that are referenced with #include.

-E cpp Pipe the input files through the specified C preprocessor command when generating
prototypes. By default, the program uses /lib/cpp.

-E 0 Do not run the C preprocessor.

-V Print version information.


The environment variable CPROTO is scanned for a list of options in the same format as the
command line options. Options given on the command line override any corresponding
environment option.

Use cproto online using onworks.net services

Free Servers & Workstations

Download Windows & Linux apps

  • 1
    USBLoaderGX is a GUI for
    Waninkoko's USB Loader, based on
    libwiigui. It allows listing and
    launching Wii games, Gamecube games and
    homebrew on Wii and WiiU...
    Download USBLoaderGX
  • 2
    Firebird RDBMS offers ANSI SQL features
    & runs on Linux, Windows &
    several Unix platforms. Features
    excellent concurrency & performance
    & power...
    Download Firebird
  • 3
    KompoZer is a wysiwyg HTML editor using
    the Mozilla Composer codebase. As
    Nvu's development has been stopped
    in 2005, KompoZer fixes many bugs and
    adds a f...
    Download KompoZer
  • 4
    Free Manga Downloader
    Free Manga Downloader
    The Free Manga Downloader (FMD) is an
    open source application written in
    Object-Pascal for managing and
    downloading manga from various websites.
    This is a mirr...
    Download Free Manga Downloader
  • 5
    UNetbootin allows you to create bootable
    Live USB drives for Ubuntu, Fedora, and
    other Linux distributions without
    burning a CD. It runs on Windows, Linux,
    and ...
    Download UNetbootin
  • 6
    Dolibarr ERP - CRM
    Dolibarr ERP - CRM
    Dolibarr ERP - CRM is an easy to use
    ERP and CRM open source software package
    (run with a web php server or as
    standalone software) for businesses,
    Download Dolibarr ERP - CRM
  • More »

Linux commands