Question

I want to find for each function defined in a C source file how many times it’s called and on which line.
Should I search for patterns which look like function definitions in C and then count how many times that function name occurs. If so, how can I do it? regular expressions?
Any help will be highly appreciated!

#!/bin/bash
if [ -r $1 ]; then
       #??????
else    
        echo The file \"$1\" does NOT exist
fi      

The final result is: (please report any bugs)

 10 if [ -r $1 ]; then
 11         functs=`grep -n -e "\(void\|double\|char\|int\) \w*(.*)"  $1 | sed 's/^.*\(void\|double\|int\) \(\w*\)(.*$/\2/g'`
 12         for f in $functs;do
 13                 echo -n  $f\(\) is called:
 14                 grep -n $f $1 > temp.txt
 15                 echo -n `grep -c -v -e "\(void\|double\|int\) $f(.*)" -e"//" temp.txt`
 16                 echo " times"
 17                 echo -n on lines:
 18                 echo -n `grep  -v -e "\(void\|double\|int\) $f(.*)" -e"//" temp.txt | sed -n 's/^\([0-9]*\)[:].*/\1/p'`
 19                 echo
 20                 echo
 21         done    
 22 else    
 23         echo The file \"$1\" does not exist
 24 fi 

Answer 1

This might sort of work. The first bit finds function definitions like

<datatype> <name>(<stuff>)

and pulls out the <name>. Then grep for that string. There are loads of situations where this won’t work, but it might be a good place to start if you’re trying to make a simple shell script that works on some programs.

functions=`grep -e "\(void\|double\|int\) \w*(.*)$" -f input.c | sed 's/^.*\(void\|double\|int\) \(\w*\)(.*$/\2/g'`
for func in $functions
do
  echo "Counting references for $func:"
  grep "$func" -f input.c | wc -l
done