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strpbrk

From cppreference.com
< c‎ | string‎ | byte
Defined in header <string.h>
char *strpbrk( const char *dest, const char *breakset );
(1)
/*QChar*/ *strpbrk( /*QChar*/ *dest, const char *breakset );
(2) (since C23)
1 ) Scans the null-terminated byte string pointed to by dest for any character from the null-terminated byte string pointed to by breakset, and returns a pointer to that character.
2) Type-generic function equivalent to (1). Let T be an unqualified character object type.
  • If dest is of type const T*, the return type is const char*.
  • Otherwise, if dest 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 (strpbrk) or a function pointer is used), the actual function declaration (1) becomes visible.

The behavior is undefined if either dest or breakset is not a pointer to a null-terminated byte string.

Contents

[edit] Parameters

dest - pointer to the null-terminated byte string to be analyzed
breakset - pointer to the null-terminated byte string that contains the characters to search for

[edit] Return value

Pointer to the first character in dest, that is also in breakset, or null pointer if no such character exists.

[edit] Notes

The name stands for "string pointer break", because it returns a pointer to the first of the separator ("break") characters.

[edit] Example

#include <stdio.h>
#include <string.h>
 
int main(void)
{
    const char* str = "hello world, friend of mine!";
    const char* sep = " ,!";
 
    unsigned int cnt = 0;
    do {
       str = strpbrk(str, sep); // find separator
       if(str) str += strspn(str, sep); // skip separator
       ++cnt; // increment word count
    } while(str && *str);
 
    printf("There are %u words\n", cnt);
}

Output:

There are 5 words

[edit] References

  • C11 standard (ISO/IEC 9899:2011):
  • 7.24.5.4 The strpbrk function (p: 368)
  • C99 standard (ISO/IEC 9899:1999):
  • 7.21.5.4 The strpbrk function (p: 331)
  • C89/C90 standard (ISO/IEC 9899:1990):
  • 4.11.5.4 The strpbrk function

[edit] See also

returns the length of the maximum initial segment that consists
of only the characters not found in another byte string
(function) [edit]
finds the first occurrence of a character
(function) [edit]
finds the next token in a byte string
(function) [edit]
C++ documentation for strpbrk