Regex to pull out C function prototype declarations?

Question

I\'m somewhere on the learning curve when it comes to regular expressions, and I need to use them to automatically modify function prototypes in a bunch of C headers. Does

Answer 1

Here's a regular expression that's a good starting point for finding C function names:

^\s*(?:(?:inline|static)\s+){0,2}(?!else|typedef|return)\w+\s+\*?\s*(\w+)\s*\([^0]+\)\s*;?

And these are some test cases to validate the expression:

// good cases
static BCB_T   *UsbpBufCtrlRemoveBack   (BCB_Q_T *pBufCtrl);
inline static AT91_REG *UDP_EpIER               (UDP_ENDPOINT_T *pEndpnt);
int UsbpEnablePort (USBP_CTRL_T *pCtrl)
bool_t IsHostConnected(void)
inline AT91_REG *UDP_EpCSR (UDP_ENDPOINT_T *pEndpnt)

// shouldn't match
typedef void (*pfXferCB)(void *pEndpnt, uint16_t Status);
    else if (bIsNulCnt && bIsBusyCnt)
            return UsbpDump(Buffer, BufSize, Option);

Finally, here's a simple TCL script to read through a file and extract all the function prototypes and function names.

set fh [open "usbp.c" r]
set contents [read $fh]
close $fh
set fileLines [split $contents \n]
set lineNum 0
set funcCount 0
set funcRegexp {^\s*(?:(?:inline|static)\s+){0,2}(?!else|typedef|return)\w+\s+\*?\s*(\w+)\s*\([^0]+\)\s*;?}
foreach line $fileLines {
    incr lineNum
    if {[regexp $funcRegexp $line -> funcName]} {
        puts "line:$lineNum, $funcName"
        incr funcCount
    }; #end if

}; #end foreach
puts "$funcCount functions found."