man3/strspn.3

   1 .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
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  25 .\" References consulted:
  26 .\"     Linux libc source code
  27 .\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
  28 .\"     386BSD man pages
  29 .\" Modified Sat Jul 24 17:57:50 1993 by Rik Faith (faith@cs.unc.edu)
  30 .TH STRSPN 3  2012-05-10 "" "Linux Programmer's Manual"
  31 .SH NAME
  32 strspn, strcspn \- search a string for a set of bytes
  33 .SH SYNOPSIS
  34 .nf
  35 .B #include <string.h>
  36 .sp
  37 .BI "size_t strspn(const char *" s ", const char *" accept );
  38 .sp
  39 .BI "size_t strcspn(const char *" s ", const char *" reject );
  40 .fi
  41 .SH DESCRIPTION
  42 The
  43 .BR strspn ()
  44 function calculates the length (in bytes) of the initial
  45 segment of \fIs\fP which consists entirely of bytes in
  46 \fIaccept\fP.
  47 .PP
  48 The
  49 .BR strcspn ()
  50 function calculates the length of the initial
  51 segment of \fIs\fP which consists entirely of bytes not in
  52 \fIreject\fP.
  53 .SH RETURN VALUE
  54 The
  55 .BR strspn ()
  56 function returns the number of bytes in
  57 the initial segment of \fIs\fP which consist only of bytes
  58 from \fIaccept\fP.
  59 .PP
  60 The
  61 .BR strcspn ()
  62 function returns the number of bytes in
  63 the initial segment of \fIs\fP which are not in the string
  64 \fIreject\fP.
  65 .SH CONFORMING TO
  66 SVr4, 4.3BSD, C89, C99.
  67 .SH SEE ALSO
  68 .BR index (3),
  69 .BR memchr (3),
  70 .BR rindex (3),
  71 .BR strchr (3),
  72 .BR string (3),
  73 .BR strpbrk (3),
  74 .BR strsep (3),
  75 .BR strstr (3),
  76 .BR strtok (3),
  77 .BR wcscspn (3),
  78 .BR wcsspn (3)