wcswidth(3)

1wcswidth(3)                Library Functions Manual                wcswidth(3)
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NAME

6       wcswidth  -  determine  columns  needed for a fixed-size wide-character
7       string
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LIBRARY

10       Standard C library (libc, -lc)
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SYNOPSIS

13       #define _XOPEN_SOURCE             /* See feature_test_macros(7) */
14       #include <wchar.h>
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16       int wcswidth(const wchar_t *s, size_t n);
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DESCRIPTION

19       The wcswidth() function returns the number of columns needed to  repre‐
20       sent  the  wide-character  string  pointed  to by s, but at most n wide
21       characters.  If a nonprintable wide character occurs among these  char‐
22       acters, -1 is returned.
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RETURN VALUE

25       The  wcswidth() function returns the number of column positions for the
26       wide-character string s, truncated to at most length n.
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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       │wcswidth()                           │ Thread safety │ MT-Safe locale │
36       └─────────────────────────────────────┴───────────────┴────────────────┘
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STANDARDS

39       POSIX.1-2008.
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HISTORY

42       POSIX.1-2001.
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NOTES

45       The  behavior  of  wcswidth()  depends  on the LC_CTYPE category of the
46       current locale.
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