The
strsep() function locates, in the nul-terminated 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 by
strsep() to ‘\0'.
If
*stringp is initially
NULL,
strsep() returns
NULL. The
stresep() function also takes an escape character that allows quoting the delimiter character so that it can be part of the source string.