Print out function name in a c file using shell script?

Question

For example, if I have the C files:

game.c
int main(){
    //code
    }

hello.c
int something(){
    //code
}

How would I get the output to be:

/directory/path/game.c
int main()

/directory/path/hello.c
int something()

I've already written a for loop to iterate through the files ending in .c in a directory, but am unsure on how to output the function names?

So Im trying to execute a shell script which will read the C files and then output its function names.

for file in $(find $1 -type f -name '*.c')
do
    echo $file
    grep -r "what to search for??"

done

Possible duplicate of [Get called function name as string](https://stackoverflow.com/questions/15349761/get-called-function-name-as-string) — nj2237, Mar 30 '18 at 07:12
The context is not clear: are you executing the C program and want to output the functions, or are you executing a shell script (which shell?) which is supposed to *read* the uncompiled C source files and print the functions found there? — Angew is no longer proud of SO, Mar 30 '18 at 07:18
Are you trying to list the functions defined in various .c files using a shell script? — R Sahu, Mar 30 '18 at 07:19
If you are under gcc, `aux-info` in a loop can help: https://stackoverflow.com/q/17163583/1606345 — David Ranieri, Mar 30 '18 at 07:27
Sorry I should've been more clear. I'm executing a shell script which is supposed to read all the C files and then print the function names out — ian, Mar 30 '18 at 07:30
@AnttiHaapala it seems that OP wants to scan multiple files. — David Ranieri, Mar 30 '18 at 07:43
OF course... another problem is that it *will* list definitions from includes too... — Antti Haapala -- Слава Україні, Mar 30 '18 at 07:47
Why not show the code for your shell script so we can help with the display? — cdarke, Mar 30 '18 at 07:52
Doing this with `grep` or something similar is entirely non-trivial. There are too many optional bits and pieces in the way functions are written to make it easy. — Jonathan Leffler, Mar 30 '18 at 08:05
This is almost (if not entirely) impossible to achieve with a simple regex. — klutt, Mar 30 '18 at 08:47

Syed Waris · Answer 1 · 2018-03-30T08:08:22.797

0

You can use regular expression to pull out the function declarations from the files. You can look here: Regex to pull out C function prototype declarations?

If the line matches the regular expression, you can print it.

edited Mar 30 '18 at 08:08

answered Mar 30 '18 at 08:02

Syed Waris

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I think you’ve missed the point of the question. The shell script should list the functions defined in the source files. – Jonathan Leffler Mar 30 '18 at 08:03
Actually I thought that since the user has inserted `//code` inside his 2 functions in the question, he is asking for some code inside the function itself. Thank you for pointing – Syed Waris Mar 30 '18 at 08:09

Print out function name in a c file using shell script?

1 Answers1