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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXAMPLES | SEE ALSO | COLOPHON |
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grepc_c(1) General Commands Manual grepc_c(1)
grepc_c - print PCRE patterns for searching C code
grepc_c [option ...] pattern
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.
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).
-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.
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
grepc(1), pcre2grep(1), pcre2syntax(3), pcre2pattern(3)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.18.tar.gz
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⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2026-05-24. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
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part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.18 2026-01-06 grepc_c(1)
Pages that refer to this page: grepc(1), grepc_c(1)
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HTML rendering created 2026-05-24 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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