strrchr

Defined in header `<string.h>`
`char strrchr( const char str, int ch );`	(1)
`/QChar/ strrchr( /QChar/ str, int ch );`	(2)	(since C23)

1) Finds the last occurrence of ch (after conversion to char as if by (char)ch) in the null-terminated byte string pointed to by str (each character interpreted as unsigned char). The terminating null character is considered to be a part of the string and can be found if searching for '\0'.

2) Type-generic function equivalent to (1). Let T be an unqualified character object type.

If str is of type const T*, the return type is const char*.
Otherwise, if str is of type T*, the return type is char*.
Otherwise, the behavior is undefined.

If a macro definition of each of these generic functions is suppressed to access an actual function (e.g. if (strrchr) or a function pointer is used), the actual function declaration (1) becomes visible.

The behavior is undefined if str is not a pointer to a null-terminated byte string.

Parameters

str	-	pointer to the null-terminated byte string to be analyzed
ch	-	character to search for

Return value

Pointer to the found character in str, or null pointer if no such character is found.

Example

#include <string.h>
#include <stdio.h>
 
int main(void)
{
    char szSomeFileName[] = "foo/bar/foobar.txt";
    char *pLastSlash = strrchr(szSomeFileName, '/');
    char *pszBaseName = pLastSlash ? pLastSlash + 1 : szSomeFileName;
    printf("Base Name: %s", pszBaseName);
}

Output:

Base Name: foobar.txt

References

C11 standard (ISO/IEC 9899:2011):

7.24.5.5 The strrchr function (p: 368-369)

C99 standard (ISO/IEC 9899:1999):

7.21.5.5 The strrchr function (p: 331)

C89/C90 standard (ISO/IEC 9899:1990):

4.11.5.5 The strrchr function

strchr	finds the first occurrence of a character (function)
strpbrk	finds the first location of any character in one string, in another string (function)
C++ documentation for `strrchr`

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strrchr

Parameters

Return value

Example

References

See also