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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 following arguments can be passed to the -t option to select the types of code that will be searched.

enum constant definitions.
Function prototypes and definitions. This can be further subdivided into:
Function prototypes.
Function definitions.
Linux kernel system calls. This can be further subdivided into:
Linux kernel system call prototypes.
Linux kernel system call definitions.
glibc internal names of libc functions. This can be further subdivided into:
glibc prototypes.
glibc definitions.
Macro definitions.
Function-like macro definitions.
Other macro definitions.
Type definitions.
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:
Uses within enum definitions (except as an enum constant).
Uses within function definition bodies.
Uses within macro replacements.
Uses within type definitions (except enum; that is: typedef, struct, or union).

OPTIONS

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)

2026-01-06 Linux man-pages (unreleased)