1WCSRTOMBS(3) Linux Programmer's Manual WCSRTOMBS(3)
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6 wcsrtombs - convert a wide-character string to a multibyte string
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9 #include <wchar.h>
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11 size_t wcsrtombs(char *dest, const wchar_t **src,
12 size_t len, mbstate_t *ps);
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15 If dest is not a NULL pointer, the wcsrtombs() function converts the
16 wide-character string *src to a multibyte string starting at dest. At
17 most len bytes are written to dest. The shift state *ps is updated.
18 The conversion is effectively performed by repeatedly calling wcr‐
19 tomb(dest, *src, ps), as long as this call succeeds, and then incre‐
20 menting dest by the number of bytes written and *src by one. The con‐
21 version can stop for three reasons:
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23 1. A wide character has been encountered that can not be represented as
24 a multibyte sequence (according to the current locale). In this case
25 *src is left pointing to the invalid wide character, (size_t) -1 is
26 returned, and errno is set to EILSEQ.
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28 2. The length limit forces a stop. In this case *src is left pointing
29 to the next wide character to be converted, and the number of bytes
30 written to dest is returned.
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32 3. The wide-character string has been completely converted, including
33 the terminating L'\0' (which has the side effect of bringing back *ps
34 to the initial state). In this case *src is set to NULL, and the num‐
35 ber of bytes written to dest, excluding the terminating '\0' byte, is
36 returned.
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38 If dest is NULL, len is ignored, and the conversion proceeds as above,
39 except that the converted bytes are not written out to memory, and that
40 no length limit exists.
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42 In both of the above cases, if ps is a NULL pointer, a static anonymous
43 state only known to the wcsrtombs function is used instead.
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45 The programmer must ensure that there is room for at least len bytes at
46 dest.
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49 The wcsrtombs() function returns the number of bytes that make up the
50 converted part of multibyte sequence, not including the terminating
51 null byte. If a wide character was encountered which could not be con‐
52 verted, (size_t) -1 is returned, and errno set to EILSEQ.
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55 C99.
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58 The behavior of wcsrtombs() depends on the LC_CTYPE category of the
59 current locale.
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61 Passing NULL as ps is not multithread safe.
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64 iconv(3), wcsnrtombs(3), wcstombs(3)
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67 This page is part of release 3.25 of the Linux man-pages project. A
68 description of the project, and information about reporting bugs, can
69 be found at http://www.kernel.org/doc/man-pages/.
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73GNU 1999-07-25 WCSRTOMBS(3)