grepc_c(1)		     General Commands Manual		      grepc_c(1)

NAME
     grepc_c - print PCRE patterns for searching C code

SYNOPSIS
     grepc_c [option ...] pattern

DESCRIPTION
     grepc_c(1) is a driver for grepc(1).  It prints PCRE patterns that grepc(1)
     will use to search for declarations, definitions, and/or uses of pattern in
     C source code.

     pattern is a PCRE pattern.	 It normally represents a C identifier, and word
     boundaries are implicitly added to it in most cases.

   Types of code
     This  program can produce PCRE pattern for several types of code.	The fol-
     lowing arguments can be passed to the -t option to select the types of code
     that will be searched.

     e	    enum constant definitions.

     f	    Function prototypes and definitions.  This can be further subdivided
	    into:

	    fp	   Function prototypes.

	    fd	   Function definitions.

	    fl	   Linux kernel system calls.  This can	 be  further  subdivided
		   into:

		   flp	  Linux kernel system call prototypes.

		   fld	  Linux kernel system call definitions.

	    fg	   glibc  internal names of libc functions.  This can be further
		   subdivided into:

		   fgp	  glibc prototypes.

		   fgd	  glibc definitions.

     m	    Macro definitions.

	    mf	   Function-like macro definitions.

	    mo	   Other macro definitions.

     t	    Type definitions.

     u	    Uses.  Searches occurences of pattern within enums, function bodies,
	    macro replacements, and type definitions, and prints the whole enum,
	    function, macro, and/or type definitions.  In this case there are no
	    word boundaries set by default, so if pattern is  open,  fopen  will
	    also be found; that's to allow searching for patterns containing any
	    sequence of characters.

	    This can be further subdivided into:

	    ue	   Uses within enum definitions (except as an enum constant).

	    uf	   Uses within function definition bodies.

	    um	   Uses within macro replacements.

	    ut	   Uses	 within type definitions (except enum; that is: typedef,
		   struct, or union).

OPTIONS
     -t type
	    Restrict the search to a specific type of code (see	 Types	of  code
	    under  DESCRIPTION).   This	 option	 can be passed multiple times to
	    search for various types of code.  Default: e f m t.

EXAMPLES
     alx@devuan:~$ grepc_c -tm alignof;
     (?s)^[ \t]*#\s*define\s[\s\\]*alignof\(.*?[^\\]$
     (?s)^[ \t]*#\s*define\s[\s\\]*alignof\b(?!\().*?(?<!\\)$
     alx@devuan:~$ cd /usr/lib/gcc/;
     alx@devuan:/usr/lib/gcc$ pcre2grep -rnMf <(grepc_c -tm alignof) .;
     ./x86_64-linux-gnu/15/include/stdalign.h:33:#define alignof _Alignof

SEE ALSO
     grepc(1), pcre2grep(1), pcre2syntax(3), pcre2pattern(3)

Linux man-pages 6.18		   2026-01-06			      grepc_c(1)