STRSEP(3) | Library Functions Manual | STRSEP(3) |
strsep
, stresep
—
#include <string.h>
char *
strsep
(char
**stringp, const char
*delim);
char *
stresep
(char
**stringp, const char
*delim, int
escape);
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.
strsep
() to parse a string,
containing tokens delimited by white space, into an argument vector:
char **ap, *argv[10], *inputstring; for (ap = argv; ap < &argv[9] && (*ap = strsep(&inputstring, " \t")) != NULL;) { if (**ap != '\0') ap++; }
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 C89”)) 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.
August 12, 2006 | NetBSD 9.2 |