strspn, strcspn - get length of a prefix substring
#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).
| Interface |
Attribute |
Value |
| strspn (), strcspn () |
Thread safety |
MT-Safe |
POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD.
index(3), memchr(3), rindex(3), strchr(3),
string(3), strpbrk(3), strsep(3), strstr(3),
strtok(3), wcscspn(3), wcsspn(3)
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