strsep man page on FreeBSD

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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 terminating
     ‘\0’ character) and replaces it with a ‘\0’.  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 location
     referenced by the returned pointer to ‘\0’.

     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\n", token);

	   free(tofree);

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

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

	   for (ap = argv; (*ap = strsep(&inputstring, " \t")) != NULL;)
		   if (**ap != '\0')
			   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() func‐
     tion.  While the strtok() function should be preferred for portability
     reasons (it conforms to ISO/IEC 9899:1990 (“ISO C90”)) it is unable to
     handle empty fields, i.e., detect fields delimited by two adjacent delim‐
     iter 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
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