strcspn
From cppreference.com
| Defined in header <string.h>
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| size_t strcspn( const char *dest, const char *src ); |
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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
| dest | - | pointer to the null-terminated byte string to be analyzed |
| src | - | pointer to the null-terminated byte string that contains the characters to search for |
Return value
The length of the maximum initial segment that contains only characters not found in the null-terminated byte string pointed to by src
Notes
The function name stands for "complementary span" because the function searches for characters not found in src, that is the complement of src.