strchr(3) Library Functions Manual strchr(3)
NAME
strchr, strrchr, strchrnul - locate character in string
LIBRARY
Standard C library (libc, -lc)
SYNOPSIS
#include <string.h>
char *strchr(const char *s, int c);
char *strrchr(const char *s, int c);
#define _GNU_SOURCE /* See feature_test_macros(7) */
#include <string.h>
char *strchrnul(const char *s, int c);
DESCRIPTION
The strchr() function returns a pointer to the first occurrence of the
character c in the string s.
The strrchr() function returns a pointer to the last occurrence of the
character c in the string s.
The strchrnul() function is like strchr() except that if c is not found
in s, then it returns a pointer to the null byte at the end of s,
rather than NULL.
Here "character" means "byte"; these functions do not work with wide or
multibyte characters.
RETURN VALUE
The strchr() and strrchr() 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 if c is specified as
'\0', these functions return a pointer to the terminator.
The strchrnul() function returns a pointer to the matched character, or
a pointer to the null byte at the end of s (i.e., s+strlen(s)) if the
character is not found.
ATTRIBUTES
For an explanation of the terms used in this section, see attrib-
utes(7).
┌───────────────────────────────────────────┬───────────────┬─────────┐
│ Interface │ Attribute │ Value │
├───────────────────────────────────────────┼───────────────┼─────────┤
│ strchr(), strrchr(), strchrnul() │ Thread safety │ MT-Safe │
└───────────────────────────────────────────┴───────────────┴─────────┘
STANDARDS
strchr()
strrchr()
C11, POSIX.1-2008.
strchrnul()
GNU.
HISTORY
strchr()
strrchr()
POSIX.1-2001, C89, SVr4, 4.3BSD.
strchrnul()
glibc 2.1.1.
SEE ALSO
memchr(3), string(3), strlen(3), strpbrk(3), strsep(3), strspn(3),
strstr(3), strtok(3), wcschr(3), wcsrchr(3)
Linux man-pages 6.7 2023-10-31 strchr(3)
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