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  1. /*
  2. FUNCTION
  3.         <<strtok>>, <<strtok_r>>, <<strsep>>---get next token from a string
  4.  
  5. INDEX
  6.         strtok
  7.  
  8. INDEX
  9.         strtok_r
  10.  
  11. INDEX
  12.         strsep
  13.  
  14. ANSI_SYNOPSIS
  15.         #include <string.h>
  16.         char *strtok(char *<[source]>, const char *<[delimiters]>)
  17.         char *strtok_r(char *<[source]>, const char *<[delimiters]>,
  18.                         char **<[lasts]>)
  19.         char *strsep(char **<[source_ptr]>, const char *<[delimiters]>)
  20.  
  21. TRAD_SYNOPSIS
  22.         #include <string.h>
  23.         char *strtok(<[source]>, <[delimiters]>)
  24.         char *<[source]>;
  25.         char *<[delimiters]>;
  26.  
  27.         char *strtok_r(<[source]>, <[delimiters]>, <[lasts]>)
  28.         char *<[source]>;
  29.         char *<[delimiters]>;
  30.         char **<[lasts]>;
  31.  
  32.         char *strsep(<[source_ptr]>, <[delimiters]>)
  33.         char **<[source_ptr]>;
  34.         char *<[delimiters]>;
  35.  
  36. DESCRIPTION
  37.         The <<strtok>> function is used to isolate sequential tokens in a
  38.         null-terminated string, <<*<[source]>>>. These tokens are delimited
  39.         in the string by at least one of the characters in <<*<[delimiters]>>>.
  40.         The first time that <<strtok>> is called, <<*<[source]>>> should be
  41.         specified; subsequent calls, wishing to obtain further tokens from
  42.         the same string, should pass a null pointer instead.  The separator
  43.         string, <<*<[delimiters]>>>, must be supplied each time and may
  44.         change between calls.
  45.  
  46.         The <<strtok>> function returns a pointer to the beginning of each
  47.         subsequent token in the string, after replacing the separator
  48.         character itself with a null character.  When no more tokens remain,
  49.         a null pointer is returned.
  50.  
  51.         The <<strtok_r>> function has the same behavior as <<strtok>>, except
  52.         a pointer to placeholder <<*<[lasts]>>> must be supplied by the caller.
  53.  
  54.         The <<strsep>> function is similar in behavior to <<strtok>>, except
  55.         a pointer to the string pointer must be supplied <<<[source_ptr]>>> and
  56.         the function does not skip leading delimiters.  When the string starts
  57.         with a delimiter, the delimiter is changed to the null character and
  58.         the empty string is returned.  Like <<strtok_r>> and <<strtok>>, the
  59.         <<*<[source_ptr]>>> is updated to the next character following the
  60.         last delimiter found or NULL if the end of string is reached with
  61.         no more delimiters.
  62.  
  63. RETURNS
  64.         <<strtok>>, <<strtok_r>>, and <<strsep>> all return a pointer to the
  65.         next token, or <<NULL>> if no more tokens can be found.  For
  66.         <<strsep>>, a token may be the empty string.
  67.  
  68. NOTES
  69.         <<strtok>> is unsafe for multi-threaded applications.  <<strtok_r>>
  70.         and <<strsep>> are thread-safe and should be used instead.
  71.  
  72. PORTABILITY
  73. <<strtok>> is ANSI C.
  74. <<strtok_r>> is POSIX.
  75. <<strsep>> is a BSD extension.
  76.  
  77. <<strtok>>, <<strtok_r>>, and <<strsep>> require no supporting OS subroutines.
  78.  
  79. QUICKREF
  80.         strtok ansi impure
  81. */
  82.  
  83. /* undef STRICT_ANSI so that strtok_r prototype will be defined */
  84. #undef  __STRICT_ANSI__
  85. #include <string.h>
  86. #include <_ansi.h>
  87. #include <reent.h>
  88.  
  89. #ifndef _REENT_ONLY
  90.  
  91. extern char *__strtok_r (char *, const char *, char **, int);
  92.  
  93. char *
  94. _DEFUN (strtok, (s, delim),
  95.         register char *s _AND
  96.         register const char *delim)
  97. {
  98.         _REENT_CHECK_MISC(_REENT);
  99.         return __strtok_r (s, delim, &(_REENT_STRTOK_LAST(_REENT)), 1);
  100. }
  101. #endif
  102.