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strchr(3) — Linux manual page

strchr(3)                Library Functions Manualstrchr(3)

NAME        top

       strchr, strrchr, strchrnul - locate character in string

LIBRARY        top

       Standard C library (libc,-lc)

SYNOPSIS        top

#include <string.h>char *strchr(const char *s, intc);char *strrchr(const char *s, intc);#define _GNU_SOURCE/* See feature_test_macros(7) */#include <string.h>char *strchrnul(const char *s, intc);

DESCRIPTION        top

       Thestrchr() function returns a pointer to the first occurrence of       the characterc in the strings.       Thestrrchr() function returns a pointer to the last occurrence of       the characterc in the strings.       Thestrchrnul() function is likestrchr() except that ifc is not       found ins, then it returns a pointer to the null byte at the end       ofs, rather than NULL.       Here "character" means "byte"; these functions do not work with       wide or multibyte characters.

RETURN VALUE        top

       Thestrchr() andstrrchr() functions return a pointer to the       matched character or NULL if the character is not found.  The       terminating null byte is considered part of the string, so that ifc is specified as '\0', these functions return a pointer to the       terminator.       Thestrchrnul() function returns a pointer to the matched       character, or a pointer to the null byte at the end ofs (i.e.,s+strlen(s)) if the character is not found.

ATTRIBUTES        top

       For an explanation of the terms used in this section, seeattributes(7).       ┌──────────────────────────────────────┬───────────────┬─────────┐       │Interface│Attribute│Value│       ├──────────────────────────────────────┼───────────────┼─────────┤       │strchr(),strrchr(),strchrnul()     │ Thread safety │ MT-Safe │       └──────────────────────────────────────┴───────────────┴─────────┘

STANDARDS        top

strchr()strrchr()              C11, POSIX.1-2008.strchrnul()              GNU.

HISTORY        top

strchr()strrchr()              POSIX.1-2001, C89, SVr4, 4.3BSD.strchrnul()              glibc 2.1.1, FreeBSD 10, NetBSD 8.

SEE ALSO        top

memchr(3),string(3),strlen(3),strpbrk(3),strsep(3),strspn(3),strstr(3),strtok(3),wcschr(3),wcsrchr(3)

COLOPHON        top

       This page is part of theman-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-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17strchr(3)

Pages that refer to this page:index(3), memchr(3), string(3), strpbrk(3), strsep(3), strspn(3), strstr(3), strtok(3), wcschr(3), wcsrchr(3), signal-safety(7)

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