1 .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
3 .\" %%%LICENSE_START(VERBATIM)
4 .\" Permission is granted to make and distribute verbatim copies of this
5 .\" manual provided the copyright notice and this permission notice are
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8 .\" Permission is granted to copy and distribute modified versions of this
9 .\" manual under the conditions for verbatim copying, provided that the
10 .\" entire resulting derived work is distributed under the terms of a
11 .\" permission notice identical to this one.
13 .\" Since the Linux kernel and libraries are constantly changing, this
14 .\" manual page may be incorrect or out-of-date. The author(s) assume no
15 .\" responsibility for errors or omissions, or for damages resulting from
16 .\" the use of the information contained herein. The author(s) may not
17 .\" have taken the same level of care in the production of this manual,
18 .\" which is licensed free of charge, as they might when working
21 .\" Formatted or processed versions of this manual, if unaccompanied by
22 .\" the source, must acknowledge the copyright and authors of this work.
25 .\" References consulted:
26 .\" Linux libc source code
27 .\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
29 .\" Modified Sat Jul 24 17:57:50 1993 by Rik Faith (faith@cs.unc.edu)
30 .TH STRSPN 3 2021-03-22 "" "Linux Programmer's Manual"
32 strspn, strcspn \- get length of a prefix substring
35 .B #include <string.h>
37 .BI "size_t strspn(const char *" s ", const char *" accept );
38 .BI "size_t strcspn(const char *" s ", const char *" reject );
43 function calculates the length (in bytes) of the initial
46 which consists entirely of bytes in
51 function calculates the length of the initial
54 which consists entirely of bytes not in
59 function returns the number of bytes in
60 the initial segment of
62 which consist only of bytes
68 function returns the number of bytes in
69 the initial segment of
71 which are not in the string
74 For an explanation of the terms used in this section, see
82 Interface Attribute Value
86 T} Thread safety MT-Safe
92 POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD.