1STRSPN(3)                  Linux Programmer's Manual                 STRSPN(3)
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NAME

6       strspn, strcspn - get length of a prefix substring
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SYNOPSIS

9       #include <string.h>
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11       size_t strspn(const char *s, const char *accept);
12       size_t strcspn(const char *s, const char *reject);
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DESCRIPTION

15       The  strspn()  function calculates the length (in bytes) of the initial
16       segment of s which consists entirely of bytes in accept.
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18       The strcspn() function calculates the length of the initial segment  of
19       s which consists entirely of bytes not in reject.
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RETURN VALUE

22       The  strspn()  function returns the number of bytes in the initial seg‐
23       ment of s which consist only of bytes from accept.
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25       The strcspn() function returns the number of bytes in the initial  seg‐
26       ment of s which are not in the string reject.
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ATTRIBUTES

29       For  an  explanation  of  the  terms  used  in  this  section,  see at‐
30       tributes(7).
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32       ┌────────────────────────────────────────────┬───────────────┬─────────┐
33       │Interface                                   │ Attribute     │ Value   │
34       ├────────────────────────────────────────────┼───────────────┼─────────┤
35       │strspn(), strcspn()                         │ Thread safety │ MT-Safe │
36       └────────────────────────────────────────────┴───────────────┴─────────┘
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CONFORMING TO

39       POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD.
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SEE ALSO

42       index(3),  memchr(3),  rindex(3),  strchr(3),  string(3),   strpbrk(3),
43       strsep(3), strstr(3), strtok(3), wcscspn(3), wcsspn(3)
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COLOPHON

46       This  page  is  part of release 5.13 of the Linux man-pages project.  A
47       description of the project, information about reporting bugs,  and  the
48       latest     version     of     this    page,    can    be    found    at
49       https://www.kernel.org/doc/man-pages/.
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53                                  2021-03-22                         STRSPN(3)
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