1 | /* |
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2 | FUNCTION |
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3 | <<wcstok>>---get next token from a string |
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4 | |
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5 | INDEX |
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6 | wcstok |
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7 | |
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8 | |
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9 | SYNOPSIS |
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10 | #include <wchar.h> |
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11 | wchar_t *wcstok(wchar_t *__restrict <[source]>, |
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12 | const wchar_t *__restrict <[delimiters]>, |
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13 | wchar_t **__restrict <[lasts]>); |
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14 | |
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15 | DESCRIPTION |
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16 | The <<wcstok>> function is the wide-character equivalent of the |
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17 | <<strtok_r>> function (which in turn is the same as the <<strtok>> |
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18 | function with an added argument to make it thread-safe). |
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19 | |
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20 | The <<wcstok>> function is used to isolate (one at a time) |
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21 | sequential tokens in a null-terminated wide-character string, |
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22 | <<*<[source]>>>. A token is defined as a substring not containing |
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23 | any wide-characters from <<*<[delimiters]>>>. |
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24 | |
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25 | The first time that <<wcstok>> is called, <<*<[source]>>> should |
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26 | be specified with the wide-character string to be searched, and |
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27 | <<*<[lasts]>>>--but not <<lasts>>, which must be non-NULL--may be |
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28 | random; subsequent calls, wishing to obtain further tokens from |
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29 | the same string, should pass a null pointer for <<*<[source]>>> |
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30 | instead but must supply <<*<[lasts]>>> unchanged from the last |
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31 | call. The separator wide-character string, <<*<[delimiters]>>>, |
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32 | must be supplied each time and may change between calls. |
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33 | A pointer to placeholder <<*<[lasts]>>> must be supplied by |
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34 | the caller, and is set each time as needed to save the state |
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35 | by <<wcstok>>. Every call to <<wcstok>> with <<*<[source]>>> |
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36 | == <<NULL>> must pass the value of <<*<[lasts]>>> as last set |
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37 | by <<wcstok>>. |
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38 | |
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39 | The <<wcstok>> function returns a pointer to the beginning of each |
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40 | subsequent token in the string, after replacing the separator |
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41 | wide-character itself with a null wide-character. When no more tokens |
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42 | remain, a null pointer is returned. |
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43 | |
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44 | RETURNS |
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45 | <<wcstok>> returns a pointer to the first wide character of a token, or |
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46 | <<NULL>> if there is no token. |
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47 | |
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48 | NOTES |
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49 | <<wcstok>> is thread-safe (unlike <<strtok>>, but like <<strtok_r>>). |
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50 | <<wcstok>> writes into the string being searched. |
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51 | |
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52 | PORTABILITY |
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53 | <<wcstok>> is C99 and POSIX.1-2001. |
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54 | |
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55 | <<wcstok>> requires no supporting OS subroutines. |
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56 | |
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57 | QUICKREF |
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58 | strtok ansi pure |
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59 | */ |
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60 | /* wcstok for Newlib created by adapting strtok_r, 2008. */ |
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61 | /* |
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62 | * Copyright (c) 1988 Regents of the University of California. |
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63 | * All rights reserved. |
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64 | * |
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65 | * Redistribution and use in source and binary forms, with or without |
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66 | * modification, are permitted provided that the following conditions |
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67 | * are met: |
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68 | * 1. Redistributions of source code must retain the above copyright |
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69 | * notice, this list of conditions and the following disclaimer. |
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70 | * 2. Redistributions in binary form must reproduce the above copyright |
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71 | * notice, this list of conditions and the following disclaimer in the |
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72 | * documentation and/or other materials provided with the distribution. |
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73 | * 3. Neither the name of the University nor the names of its contributors |
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74 | * may be used to endorse or promote products derived from this software |
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75 | * without specific prior written permission. |
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76 | * |
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77 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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78 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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79 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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80 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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81 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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82 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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83 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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84 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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85 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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86 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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87 | * SUCH DAMAGE. |
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88 | */ |
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89 | |
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90 | #include <wchar.h> |
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91 | |
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92 | wchar_t * |
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93 | wcstok (register wchar_t *__restrict s, |
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94 | register const wchar_t *__restrict delim, |
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95 | wchar_t **__restrict lasts) |
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96 | { |
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97 | register const wchar_t *spanp; |
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98 | register int c, sc; |
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99 | wchar_t *tok; |
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100 | |
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101 | |
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102 | if (s == NULL && (s = *lasts) == NULL) |
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103 | return (NULL); |
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104 | |
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105 | /* |
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106 | * Skip (span) leading delimiters (s += wcsspn(s, delim), sort of). |
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107 | */ |
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108 | cont: |
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109 | c = *s++; |
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110 | for (spanp = delim; (sc = *spanp++) != L'\0';) { |
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111 | if (c == sc) goto cont; |
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112 | } |
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113 | |
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114 | if (c == L'\0') { /* no non-delimiter characters */ |
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115 | *lasts = NULL; |
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116 | return (NULL); |
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117 | } |
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118 | tok = s - 1; |
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119 | |
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120 | /* |
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121 | * Scan token (scan for delimiters: s += wcscspn(s, delim), sort of). |
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122 | * Note that delim must have one NUL; we stop if we see that, too. |
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123 | */ |
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124 | for (;;) { |
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125 | c = *s++; |
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126 | spanp = delim; |
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127 | do { |
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128 | if ((sc = *spanp++) == c) { |
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129 | if (c == L'\0') |
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130 | s = NULL; |
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131 | else |
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132 | s[-1] = L'\0'; |
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133 | *lasts = s; |
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134 | return (tok); |
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135 | } |
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136 | } while (sc != L'\0'); |
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137 | } |
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138 | /* NOTREACHED */ |
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139 | } |
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140 | |
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141 | /* The remainder of this file can serve as a regression test. Compile |
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142 | * with -D_REGRESSION_TEST. */ |
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143 | #if defined(_REGRESSION_TEST) /* [Test code: example from C99 standard */ |
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144 | #include <stdio.h> |
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145 | #include <wchar.h> |
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146 | |
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147 | /* example from C99 standard with minor additions to be a test */ |
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148 | int |
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149 | main(void) |
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150 | { |
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151 | int errs=0; |
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152 | static wchar_t str1[] = L"?a???b,,,#c"; |
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153 | static wchar_t str2[] = L"\t \t"; |
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154 | wchar_t *t, *ptr1, *ptr2; |
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155 | |
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156 | t = wcstok(str1, L"?", &ptr1); // t points to the token L"a" |
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157 | if(wcscmp(t,L"a")) errs++; |
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158 | t = wcstok(NULL, L",", &ptr1); // t points to the token L"??b" |
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159 | if(wcscmp(t,L"??b")) errs++; |
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160 | t = wcstok(str2, L" \t", &ptr2); // t is a null pointer |
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161 | if(t != NULL) errs++; |
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162 | t = wcstok(NULL, L"#,", &ptr1); // t points to the token L"c" |
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163 | if(wcscmp(t,L"c")) errs++; |
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164 | t = wcstok(NULL, L"?", &ptr1); // t is a null pointer |
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165 | if(t != NULL) errs++; |
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166 | |
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167 | printf("wcstok() test "); |
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168 | if(errs) printf("FAILED %d test cases", errs); |
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169 | else printf("passed"); |
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170 | printf(".\n"); |
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171 | |
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172 | return(errs); |
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173 | } |
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174 | #endif /* defined(_REGRESSION_TEST) ] */ |
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