Man page - strspn(3)

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strspn, strcspn - get length of a prefix substring

Standard C library ( libc , -lc )

#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).

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C11, POSIX.1-2008.

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