strsep - separate strings
#include <string.h>
char *
strsep(char **stringp, const 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
` ' 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., one caused by two adjacent delimiter characters,
can be detected by comparing the location referenced
by the pointer
returned by strsep() to ` '.
If *stringp is initially NULL, strsep() returns NULL.
The following uses strsep() to parse a string, containing
tokens delimited
by whitespace, into an argument vector:
char **ap, *argv[10], *inputstring;
for (ap = argv; ap < &argv[9] &&
(*ap = strsep(&inputstring, " ")) != NULL;) {
if (**ap != ' ')
ap++;
}
*ap = NULL;
The strsep() function is intended as a replacement for the
strtok() function.
While the strtok() function should be preferred for
portability
reasons (it conforms to ANSI X3.159-1989 (``ANSI C'')) it is
unable to
handle empty fields, i.e., detect fields delimited by two
adjacent delimiter
characters, or to be used for more than a single string
at a time.
The strsep() function first appeared in 4.4BSD.
OpenBSD 3.6 June 9, 1993
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