strsep man page on 4.4BSD

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

     strsep — separate strings

     #include <string.h>

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

     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. one caused by two adjacent delimiter characters,
     can be detected by comparing the location referenced by the pointer
     returned in *stringp to ‘\0’.

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

     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')

     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 ANSI X3.159-1989 (“ANSI C89”)) 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				 June 9, 1993				   BSD

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