Manpages - strspn.3

strspn, strcspn - get length of a prefix substring

  #include <string.h>

  size_t strspn(const char *s, const char *accept);
  size_t strcspn(const char *s, const char *reject);

The *strspn*() function calculates the length (in bytes) of the initial segment of s which consists entirely of bytes in accept.

The *strcspn*() function calculates the length of the initial segment of s which consists entirely of bytes not in reject.

The *strspn*() function returns the number of bytes in the initial segment of s which consist only of bytes from accept.

The *strcspn*() function returns the number of bytes in the initial segment of s which are not in the string reject.

For an explanation of the terms used in this section, see *attributes*(7).

POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD.

*index*(3), *memchr*(3), *rindex*(3), *strchr*(3), *string*(3), *strpbrk*(3), *strsep*(3), *strstr*(3), *strtok*(3), *wcscspn*(3), *wcsspn*(3)

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