strcspn

strcspn

Defined in header <string.h>
size_t strcspn( const char *dest, const char *src );

Returns the length of the maximum initial segment of the null-terminated byte string pointed to by dest, that consists of only the characters not found in the null-terminated byte string pointed to by src.

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

Parameters

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dest - pointer to the null-terminated byte string to be analyzed