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). |
C11, POSIX.1-2008.
POSIX.1-2001, C89, SVr4, 4.3BSD.
memchr(3), strchr(3), string(3), strpbrk(3), strsep(3), strstr(3), strtok(3), wcscspn(3), wcsspn(3)