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           #include <string.h>
           char *strtok(char *str, const char *delim);
           char *strtok_r(char *str, const char *delim, char **saveptr);
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
           strtok_r(): _SVID_SOURCE || _BSD_SOURCE || _POSIX_C_SOURCE >= 1 ||


           The strtok() function breaks a string into a sequence of zero  or  more
           nonempty tokens.  On the first call to strtok() the string to be parsed
           should be specified in str.  In each subsequent call that should  parse
           the same string, str must be NULL.
           The  delim argument specifies a set of bytes that delimit the tokens in
           the parsed string.  The caller may specify different strings  in  delim
           in successive calls that parse the same string.
           Each  call  to  strtok()  returns a pointer to a null-terminated string
           containing the next token.  This string does not include the delimiting
           byte.  If no more tokens are found, strtok() returns NULL.
           A  sequence  of calls to strtok() that operate on the same string main-
           tains a pointer that determines the point from which to start searching
           for  the  next  token.  The first call to strtok() sets this pointer to
           point to the first byte of the string.  The start of the next token  is
           determined  by  scanning forward for the next nondelimiter byte in str.
           If such a byte is found, it is taken as the start of  the  next  token.
           If  no  such byte is found, then there are no more tokens, and strtok()
           returns NULL.  (A string that is empty or that contains only delimiters
           will thus cause strtok() to return NULL on the first call.)
           The  end  of  each  token is found by scanning forward until either the
           next delimiter byte is found or until the terminating null byte  ('\0')
           is encountered.  If a delimiter byte is found, it is overwritten with a
           null byte to terminate the current token, and strtok() saves a  pointer
           to  the following byte; that pointer will be used as the starting point
           when searching for the next token.  In this case,  strtok()  returns  a
           pointer to the start of the found token.
           From  the  above description, it follows that a sequence of two or more
           contiguous delimiter bytes in the parsed string is considered to  be  a
           single  delimiter,  and that delimiter bytes at the start or end of the
           string are ignored.  Put another way: the tokens returned  by  strtok()
           are  always  nonempty  strings.   Thus,  for  example, given the string
           "aaa;;bbb,", successive calls to strtok() that  specify  the  delimiter
           string  ";,"  would return the strings "aaa" and "bbb", and then a null


           The  strtok()  and  strtok_r()  functions  return a pointer to the next
           token, or NULL if there are no more tokens.


       Multithreading (see pthreads(7))
           The strtok() function is not thread-safe.
           The strtok_r() function is thread-safe.


                  SVr4, POSIX.1-2001, 4.3BSD, C89, C99.


           Be cautious when using these functions.  If you do use them, note that:
           * These functions modify their first argument.
           * These functions cannot be used on constant strings.
           * The identity of the delimiting byte is lost.
           * The strtok() function uses a static buffer while parsing, so it's not
             thread safe.  Use strtok_r() if this matters to you.


           The program below uses nested loops that employ strtok_r() to  break  a
           string  into  a  two-level hierarchy of tokens.  The first command-line
           argument specifies the string to be parsed.  The second argument speci-
           fies  the  delimiter  byte(s)  to  be used to separate that string into
           "major" tokens.  The third argument specifies the delimiter byte(s)  to
           be used to separate the "major" tokens into subtokens.
           An example of the output produced by this program is the following:
               $ ./a.out 'a/bbb///cc;xxx:yyy:' ':;' '/'
               1: a/bbb///cc
                        --> a
                        --> bbb
                        --> cc
               2: xxx
                        --> xxx
               3: yyy
                        --> yyy
       Program source
           #include <stdio.h>
               for (j = 1, str1 = argv[1]; ; j++, str1 = NULL) {
                   token = strtok_r(str1, argv[2], &saveptr1);
                   if (token == NULL)
                   printf("%d: %s\n", j, token);
                   for (str2 = token; ; str2 = NULL) {
                       subtoken = strtok_r(str2, argv[3], &saveptr2);
                       if (subtoken == NULL)
                       printf(" --> %s\n", subtoken);
           Another   example  program  using  strtok()  can  be  found  in  getad-


           index(3),  memchr(3),  rindex(3),  strchr(3),  string(3),   strpbrk(3),
           strsep(3), strspn(3), strstr(3), wcstok(3)

    GNU 2013-05-19 STRTOK(3)


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