strsep(3) [freebsd man page]

STRSEP(3)						   BSD Library Functions Manual 						 STRSEP(3)

NAME

     strsep -- separate strings

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <string.h>

     char *
     strsep(char **stringp, const char *delim);

DESCRIPTION

     The strsep() function locates, in the string referenced by *stringp, the first occurrence of any character in the string delim (or the termi-
     nating '' character) and replaces it with a ''.  The location of the next character after the delimiter character (or NULL, if the end of
     the string was reached) is stored in *stringp.  The original value of *stringp is returned.

     An ``empty'' field (i.e., a character in the string delim occurs as the first character of *stringp) can be detected by comparing the loca-
     tion referenced by the returned pointer to ''.

     If *stringp is initially NULL, strsep() returns NULL.

EXAMPLES

     The following uses strsep() to parse a string, and prints each token in separate line:

	   char *token, *string, *tofree;

	   tofree = string = strdup("abc,def,ghi");
	   assert(string != NULL);

	   while ((token = strsep(&string, ",")) != NULL)
		   printf("%s
", token);

	   free(tofree);

     The following uses strsep() to parse a string, containing tokens delimited by white space, into an argument vector:

	   char **ap, *argv[10], *inputstring;

	   for (ap = argv; (*ap = strsep(&inputstring, " 	")) != NULL;)
		   if (**ap != '')
			   if (++ap >= &argv[10])
				   break;

SEE ALSO

     memchr(3), strchr(3), strcspn(3), strpbrk(3), strrchr(3), strspn(3), strstr(3), strtok(3)

HISTORY

     The strsep() function is intended as a replacement for the strtok() function.  While the strtok() function should be preferred for portabil-
     ity reasons (it conforms to ISO/IEC 9899:1990 (``ISO C90'')) it is unable to handle empty fields, i.e., detect fields delimited by two adja-
     cent delimiter characters, or to be used for more than a single string at a time.	The strsep() function first appeared in 4.4BSD.

BSD
								 December 5, 2008							       BSD

STRSEP(3)						     Linux Programmer's Manual							 STRSEP(3)

NAME

       strsep - extract token from string

SYNOPSIS

       #include <string.h>

       char *strsep(char **stringp, const char *delim);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       strsep():
	   Since glibc 2.19:
	       _DEFAULT_SOURCE
	   Glibc 2.19 and earlier:
	       _BSD_SOURCE

DESCRIPTION

       If  *stringp  is  NULL,	the  strsep()  function returns NULL and does nothing else.  Otherwise, this function finds the first token in the
       string *stringp, that is delimited by one of the bytes in the string delim.  This token is terminated by overwriting the delimiter  with  a
       null  byte  (''),  and  *stringp is updated to point past the token.  In case no delimiter was found, the token is taken to be the entire
       string *stringp, and *stringp is made NULL.

RETURN VALUE

       The strsep() function returns a pointer to the token, that is, it returns the original value of *stringp.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       +----------+---------------+---------+
       |Interface | Attribute	  | Value   |
       +----------+---------------+---------+
       |strsep()  | Thread safety | MT-Safe |
       +----------+---------------+---------+
CONFORMING TO

       4.4BSD.

NOTES

       The strsep() function was introduced as a replacement for strtok(3), since the latter cannot handle empty fields.  However, strtok(3)  con-
       forms to C89/C99 and hence is more portable.

BUGS

       Be cautious when using this function.  If you do use it, note that:

       * This function modifies its first argument.

       * This function cannot be used on constant strings.

       * The identity of the delimiting character is lost.

SEE ALSO

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

COLOPHON

       This  page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

GNU
								    2016-03-15								 STRSEP(3)