AWK script for generating switch/case statements to stringify #define'd macro names

defines_to_cases.awk

#!/usr/bin/env awk -f

# Given a C-like header file, this AWK script will generate a sequence
# of case statements for stringifying macro names.
#
# For example, if the input file looks like this:
#
#   #define kIOReturnSuccess         KERN_SUCCESS            // OK
#   #define kIOReturnError           iokit_common_err(0x2bc) // general error 	
#   #define kIOReturnNoMemory        iokit_common_err(0x2bd) // can't allocate memory 
#
# Then the output will look like this:
#
#   case kIOReturnSuccess:
#       return "kIOReturnSuccess";
#   case kIOReturnError:
#       return "kIOReturnError";
#   case kIOReturnNoMemory:
#       return "kIOReturnNoMemory";
#
# Any input lines that don't start with "#define" are ignored.

/^ *#define [a-zA-Z0-9_]+/ { printf "case %s:\n    return \"%s\";\n", $2, $2  }