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10943
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1 /* Convert wide string to string. |
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2 Copyright (C) 2008 Free Software Foundation, Inc. |
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3 Written by Bruno Haible <bruno@clisp.org>, 2008. |
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4 |
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5 This program is free software: you can redistribute it and/or modify |
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6 it under the terms of the GNU General Public License as published by |
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7 the Free Software Foundation; either version 3 of the License, or |
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8 (at your option) any later version. |
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9 |
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10 This program is distributed in the hope that it will be useful, |
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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13 GNU General Public License for more details. |
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14 |
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15 You should have received a copy of the GNU General Public License |
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16 along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
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17 |
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18 #include <config.h> |
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19 |
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20 /* Specification. */ |
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21 #include <wchar.h> |
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22 |
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10945
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23 #include <errno.h> |
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24 #include <stdlib.h> |
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25 #include <string.h> |
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10943
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26 |
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27 |
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28 extern mbstate_t _gl_wcsrtombs_state; |
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29 |
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30 size_t |
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31 wcsnrtombs (char *dest, const wchar_t **srcp, size_t srclen, size_t len, mbstate_t *ps) |
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32 { |
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33 if (ps == NULL) |
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34 ps = &_gl_wcsrtombs_state; |
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35 { |
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36 const wchar_t *src = *srcp; |
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37 size_t cur_max = MB_CUR_MAX; |
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38 char buf[64]; |
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39 |
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40 if (!(cur_max <= sizeof (buf))) |
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41 abort (); |
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42 |
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43 if (dest != NULL) |
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44 { |
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45 char *destptr = dest; |
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46 |
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47 for (; srclen > 0 && len > 0; src++, srclen--) |
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48 { |
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49 wchar_t wc = *src; |
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50 size_t ret = wcrtomb (len >= cur_max ? destptr : buf, wc, ps); |
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51 |
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52 if (ret == (size_t)(-1)) |
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53 goto bad_input; |
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54 if (!(ret <= cur_max)) |
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55 abort (); |
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56 if (len < ret) |
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57 break; |
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58 if (len < cur_max) |
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59 memcpy (destptr, buf, ret); |
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60 if (wc == 0) |
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61 { |
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62 src = NULL; |
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63 /* Here mbsinit (ps). */ |
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64 break; |
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65 } |
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66 destptr += ret; |
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67 len -= ret; |
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68 } |
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69 *srcp = src; |
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70 return destptr - dest; |
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71 } |
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72 else |
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73 { |
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74 /* Ignore dest and len, don't store *srcp at the end, and |
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75 don't clobber *ps. */ |
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76 mbstate_t state = *ps; |
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77 size_t totalcount = 0; |
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78 |
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79 for (; srclen > 0; src++, srclen--) |
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80 { |
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81 wchar_t wc = *src; |
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82 size_t ret = wcrtomb (buf, wc, &state); |
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83 |
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84 if (ret == (size_t)(-1)) |
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85 goto bad_input2; |
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86 if (wc == 0) |
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87 { |
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88 /* Here mbsinit (&state). */ |
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89 break; |
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90 } |
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91 totalcount += ret; |
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92 } |
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93 return totalcount; |
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94 } |
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95 |
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96 bad_input: |
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97 *srcp = src; |
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98 bad_input2: |
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99 errno = EILSEQ; |
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100 return (size_t)(-1); |
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101 } |
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102 } |
