man3/strspn.3

   1 .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
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  23 .\" References consulted:
  24 .\"     Linux libc source code
  25 .\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
  26 .\"     386BSD man pages
  27 .\" Modified Sat Jul 24 17:57:50 1993 by Rik Faith (faith@cs.unc.edu)
  28 .TH STRSPN 3  1993-04-12 "" "Linux Programmer's Manual"
  29 .SH NAME
  30 strspn, strcspn \- search a string for a set of characters
  31 .SH SYNOPSIS
  32 .nf
  33 .B #include <string.h>
  34 .sp
  35 .BI "size_t strspn(const char *" s ", const char *" accept );
  36 .sp
  37 .BI "size_t strcspn(const char *" s ", const char *" reject );
  38 .fi
  39 .SH DESCRIPTION
  40 The
  41 .BR strspn ()
  42 function calculates the length of the initial
  43 segment of \fIs\fP which consists entirely of characters in
  44 \fIaccept\fP.
  45 .PP
  46 The
  47 .BR strcspn ()
  48 function calculates the length of the initial
  49 segment of \fIs\fP which consists entirely of characters not in
  50 \fIreject\fP.
  51 .SH "RETURN VALUE"
  52 The
  53 .BR strspn ()
  54 function returns the number of characters in
  55 the initial segment of \fIs\fP which consist only of characters
  56 from \fIaccept\fP.
  57 .PP
  58 The
  59 .BR strcspn ()
  60 function returns the number of characters in
  61 the initial segment of \fIs\fP which are not in the string
  62 \fIreject\fP.
  63 .SH "CONFORMING TO"
  64 SVr4, 4.3BSD, C89, C99.
  65 .SH "SEE ALSO"
  66 .BR index (3),
  67 .BR memchr (3),
  68 .BR rindex (3),
  69 .BR strchr (3),
  70 .BR strpbrk (3),
  71 .BR strsep (3),
  72 .BR strstr (3),
  73 .BR strtok (3),
  74 .BR wcscspn (3),
  75 .BR wcsspn (3)