How can I search a string data cross more *.c and *.h files?

[gwa...@gmail.com]

Hi,

I install VimTouch into tablet but not root. Dose any possible to search a string data from more *.c and *.h like as follow bash command?

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$ find . -name '*.c' -o -name '*.h' -type f | xagrs grep -n 'symbol_name'
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I hope read code under android tablet, but I need find out 'symbol define location' or 'which one read/write or invoke it' from more files.

And I try to keyin find and grep command after instruction ":!", but system response 'find' and 'grep' are not exist. Please give a advice for help, thanks a lot.