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1 | .\" Copyright (c) Bruno Haible <haible@clisp.cons.org> |
2 | .\" | |
89e3ffe9 | 3 | .\" %%%LICENSE_START(GPLv2+_DOC_ONEPARA) |
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4 | .\" This is free documentation; you can redistribute it and/or |
5 | .\" modify it under the terms of the GNU General Public License as | |
6 | .\" published by the Free Software Foundation; either version 2 of | |
7 | .\" the License, or (at your option) any later version. | |
fe382ebf | 8 | .\" %%%LICENSE_END |
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9 | .\" |
10 | .\" References consulted: | |
11 | .\" GNU glibc-2 source code and manual | |
12 | .\" Dinkumware C library reference http://www.dinkumware.com/ | |
008f1ecc | 13 | .\" OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html |
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14 | .\" ISO/IEC 9899:1999 |
15 | .\" | |
16 | .TH MBLEN 3 1999-07-25 "GNU" "Linux Programmer's Manual" | |
17 | .SH NAME | |
18 | mblen \- determine number of bytes in next multibyte character | |
19 | .SH SYNOPSIS | |
20 | .nf | |
21 | .B #include <stdlib.h> | |
22 | .sp | |
23 | .BI "int mblen(const char *" s ", size_t " n ); | |
24 | .fi | |
25 | .SH DESCRIPTION | |
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26 | If \fIs\fP is not a NULL pointer, the |
27 | .BR mblen () | |
28 | function inspects at most | |
fea681da | 29 | \fIn\fP bytes of the multibyte string starting at \fIs\fP and extracts the |
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30 | next complete multibyte character. |
31 | It uses a static anonymous shift state only | |
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32 | known to the |
33 | .BR mblen () | |
34 | function. | |
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35 | If the multibyte character is not the null wide |
36 | character, it returns the number of bytes that were consumed from \fIs\fP. | |
37 | If the multibyte character is the null wide character, it returns 0. | |
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38 | .PP |
39 | If the \fIn\fP bytes starting at \fIs\fP do not contain a complete multibyte | |
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40 | character, |
41 | .BR mblen () | |
42 | returns \-1. | |
c13182ef | 43 | This can happen even if |
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44 | \fIn\fP is greater than or equal to \fIMB_CUR_MAX\fP, |
45 | if the multibyte string contains redundant shift sequences. | |
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46 | .PP |
47 | If the multibyte string starting at \fIs\fP contains an invalid multibyte | |
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48 | sequence before the next complete character, |
49 | .BR mblen () | |
00e28710 | 50 | also returns \-1. |
fea681da | 51 | .PP |
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52 | If \fIs\fP is a NULL pointer, the |
53 | .BR mblen () | |
54 | function | |
008f1ecc | 55 | .\" The Dinkumware doc and the Single UNIX specification say this, but |
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56 | .\" glibc doesn't implement this. |
57 | resets the shift state, only known to this function, to the initial state, and | |
c7094399 | 58 | returns nonzero if the encoding has nontrivial shift state, or zero if the |
fea681da | 59 | encoding is stateless. |
47297adb | 60 | .SH RETURN VALUE |
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61 | The |
62 | .BR mblen () | |
63 | function returns the number of | |
c13182ef | 64 | bytes parsed from the multibyte |
fea681da | 65 | sequence starting at \fIs\fP, if a non-null wide character was recognized. |
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66 | It returns 0, if a null wide character was recognized. |
67 | It returns \-1, if an | |
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68 | invalid multibyte sequence was encountered or if it couldn't parse a complete |
69 | multibyte character. | |
47297adb | 70 | .SH CONFORMING TO |
44a2c328 | 71 | C99. |
fea681da | 72 | .SH NOTES |
d9bfdb9c | 73 | The behavior of |
60a90ecd | 74 | .BR mblen () |
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75 | depends on the |
76 | .B LC_CTYPE | |
77 | category of the | |
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78 | current locale. |
79 | .PP | |
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80 | The function |
81 | .BR mbrlen (3) | |
82 | provides a better interface to the same | |
fea681da | 83 | functionality. |
47297adb | 84 | .SH SEE ALSO |
e37e3282 | 85 | .BR mbrlen (3) |