1 | /* |
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2 | FUNCTION |
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3 | <<wcsrtombs>>, <<wcsnrtombs>>---convert a wide-character string to a character string |
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4 | |
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5 | INDEX |
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6 | wcsrtombs |
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7 | INDEX |
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8 | _wcsrtombs_r |
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9 | INDEX |
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10 | wcsnrtombs |
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11 | INDEX |
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12 | _wcsnrtombs_r |
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13 | |
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14 | SYNOPSIS |
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15 | #include <wchar.h> |
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16 | size_t wcsrtombs(char *__restrict <[dst]>, |
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17 | const wchar_t **__restrict <[src]>, size_t <[len]>, |
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18 | mbstate_t *__restrict <[ps]>); |
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19 | |
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20 | #include <wchar.h> |
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21 | size_t _wcsrtombs_r(struct _reent *<[ptr]>, char *<[dst]>, |
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22 | const wchar_t **<[src]>, size_t <[len]>, |
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23 | mbstate_t *<[ps]>); |
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24 | |
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25 | #include <wchar.h> |
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26 | size_t wcsnrtombs(char *__restrict <[dst]>, |
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27 | const wchar_t **__restrict <[src]>, |
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28 | size_t <[nwc]>, size_t <[len]>, |
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29 | mbstate_t *__restrict <[ps]>); |
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30 | |
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31 | #include <wchar.h> |
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32 | size_t _wcsnrtombs_r(struct _reent *<[ptr]>, char *<[dst]>, |
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33 | const wchar_t **<[src]>, size_t <[nwc]>, |
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34 | size_t <[len]>, mbstate_t *<[ps]>); |
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35 | |
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36 | DESCRIPTION |
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37 | The <<wcsrtombs>> function converts a string of wide characters indirectly |
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38 | pointed to by <[src]> to a corresponding multibyte character string stored in |
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39 | the array pointed to by <[dst]>. No more than <[len]> bytes are written to |
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40 | <[dst]>. |
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41 | |
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42 | If <[dst]> is NULL, no characters are stored. |
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43 | |
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44 | If <[dst]> is not NULL, the pointer pointed to by <[src]> is updated to point |
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45 | to the character after the one that conversion stopped at. If conversion |
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46 | stops because a null character is encountered, *<[src]> is set to NULL. |
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47 | |
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48 | The mbstate_t argument, <[ps]>, is used to keep track of the shift state. If |
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49 | it is NULL, <<wcsrtombs>> uses an internal, static mbstate_t object, which |
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50 | is initialized to the initial conversion state at program startup. |
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51 | |
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52 | The <<wcsnrtombs>> function behaves identically to <<wcsrtombs>>, except that |
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53 | conversion stops after reading at most <[nwc]> characters from the buffer |
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54 | pointed to by <[src]>. |
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55 | |
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56 | RETURNS |
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57 | The <<wcsrtombs>> and <<wcsnrtombs>> functions return the number of bytes |
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58 | stored in the array pointed to by <[dst]> (not including any terminating |
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59 | null), if successful, otherwise it returns (size_t)-1. |
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60 | |
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61 | PORTABILITY |
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62 | <<wcsrtombs>> is defined by C99 standard. |
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63 | <<wcsnrtombs>> is defined by the POSIX.1-2008 standard. |
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64 | */ |
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65 | |
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66 | #include <reent.h> |
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67 | #include <newlib.h> |
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68 | #include <wchar.h> |
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69 | #include <stdlib.h> |
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70 | #include <stdio.h> |
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71 | #include <errno.h> |
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72 | #include "local.h" |
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73 | #include "../locale/setlocale.h" |
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74 | |
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75 | size_t |
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76 | _wcsnrtombs_l (struct _reent *r, char *dst, const wchar_t **src, size_t nwc, |
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77 | size_t len, mbstate_t *ps, struct __locale_t *loc) |
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78 | { |
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79 | char *ptr = dst; |
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80 | char buff[10]; |
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81 | wchar_t *pwcs; |
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82 | size_t n; |
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83 | int i; |
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84 | |
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85 | #ifdef _MB_CAPABLE |
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86 | if (ps == NULL) |
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87 | { |
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88 | _REENT_CHECK_MISC(r); |
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89 | ps = &(_REENT_WCSRTOMBS_STATE(r)); |
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90 | } |
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91 | #endif |
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92 | |
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93 | /* If no dst pointer, treat len as maximum possible value. */ |
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94 | if (dst == NULL) |
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95 | len = (size_t)-1; |
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96 | |
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97 | n = 0; |
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98 | pwcs = (wchar_t *)(*src); |
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99 | |
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100 | while (n < len && nwc-- > 0) |
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101 | { |
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102 | int count = ps->__count; |
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103 | wint_t wch = ps->__value.__wch; |
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104 | int bytes = loc->wctomb (r, buff, *pwcs, ps); |
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105 | if (bytes == -1) |
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106 | { |
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107 | r->_errno = EILSEQ; |
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108 | ps->__count = 0; |
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109 | return (size_t)-1; |
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110 | } |
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111 | if (n + bytes <= len) |
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112 | { |
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113 | n += bytes; |
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114 | if (dst) |
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115 | { |
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116 | for (i = 0; i < bytes; ++i) |
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117 | *ptr++ = buff[i]; |
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118 | ++(*src); |
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119 | } |
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120 | if (*pwcs++ == 0x00) |
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121 | { |
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122 | if (dst) |
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123 | *src = NULL; |
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124 | ps->__count = 0; |
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125 | return n - 1; |
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126 | } |
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127 | } |
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128 | else |
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129 | { |
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130 | /* not enough room, we must back up state to before __WCTOMB call */ |
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131 | ps->__count = count; |
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132 | ps->__value.__wch = wch; |
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133 | len = 0; |
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134 | } |
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135 | } |
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136 | |
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137 | return n; |
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138 | } |
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139 | |
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140 | size_t |
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141 | _wcsnrtombs_r (struct _reent *r, |
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142 | char *dst, |
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143 | const wchar_t **src, |
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144 | size_t nwc, |
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145 | size_t len, |
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146 | mbstate_t *ps) |
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147 | { |
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148 | return _wcsnrtombs_l (_REENT, dst, src, nwc, len, ps, |
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149 | __get_current_locale ()); |
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150 | } |
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151 | |
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152 | #ifndef _REENT_ONLY |
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153 | size_t |
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154 | wcsnrtombs (char *__restrict dst, |
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155 | const wchar_t **__restrict src, |
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156 | size_t nwc, |
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157 | size_t len, |
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158 | mbstate_t *__restrict ps) |
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159 | { |
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160 | return _wcsnrtombs_l (_REENT, dst, src, nwc, len, ps, |
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161 | __get_current_locale ()); |
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162 | } |
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163 | #endif /* !_REENT_ONLY */ |
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