HelenOS sources

print_string      475 uspace/app/top/screen.c 		print_string(warning_text);
print_string      477 uspace/dist/src/c/demos/top/screen.c 		print_string(warning_text);
print_string      214 uspace/lib/bithenge/src/print.c 		return print_string(state, tree);
HelenOS homepage, sources at GitHub