Verbose output from R CMD check

Both the following lines return 0 hits
grep printf *.c|grep -v Rprintf|grep -v fprintf
grep puts *.c

Is there some way to detect what has caused this warning about puts?
It's not a call to 'puts' or 'printf' because there are none.

Longshot:

grep '[^Rf]printf' *.c

Peter's longshot hit the bull's eye, this was the offending line

foobar.c:  if (*smoothOrStochastic==0) Rprintf("0\n"); else (printf("1\n"));

So I clearly need to brush up a little on regular expressions. The 
mistake is the scripting was that I used this

find . -maxdepth 1 -type f -name '*.c' -exec sed -i 's\printf\Rprintf\'{} \;
find . -maxdepth 1 -type f -name '*.c' -exec sed -i 's\fRprintf\fprintf\' {} \;

and not this

find . -maxdepth 1 -type f -name '*.c' -exec sed -i 's\printf\Rprintf\g'{} \;
find . -maxdepth 1 -type f -name '*.c' -exec sed -i 's\fRprintf\fprintf\g' {} \;

Many thanks Simon, Peter and Martin for your suggestions, R CMD check 
now runs clean :-)
David

David Pleydell,
INRA,
UMR-1351 CMAEE,
Domaine Duclos,
Prise D'eau,
97122 Petit Bourg,
Guadeloupe
dpleydell at antilles.inra.fr
pleydell at cirad.fr
Tel +33 5 90 25 54 42
Fax +33 5 90 94 03 96