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Command: strsep | Section: 3 | Source: OpenBSD | File: strsep.3
STRSEP(3) FreeBSD Library Functions Manual STRSEP(3)
NAME
strsep - separate strings
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., 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.
EXAMPLES
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, " \t")) != NULL;) {
if (**ap != '\0')
ap++;
}
*ap = NULL;
HISTORY
The strsep() function first appeared in 4.3BSD-Reno. It is intended as a
replacement for the strtok(3) function. While the strtok(3) 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.
FreeBSD 14.1-RELEASE-p8 June 5, 2013 FreeBSD 14.1-RELEASE-p8