strspn, strcspn

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strspn(3)	referred by	index(3) \| memchr(3) \| signal-safety(7) \| strchr(3) \| string(3) \| strnstr(3bsd) \| strpbrk(3) \| strsep(3) \| strstr(3) \| strtok(3) \| wcscspn(3) \| wcsspn(3)
strspn(3)	refer to	attributes(7) \| index(3) \| memchr(3) \| strchr(3) \| string(3) \| strpbrk(3) \| strsep(3) \| strstr(3) \| strtok(3) \| wcscspn(3) \| wcsspn(3)