4.3BSD-Reno/src/lib/libc/string/strsep.3

.\" Copyright (c) 1990 The Regents of the University of California.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" Chris Torek.
.\"
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.\" developed by the University of California, Berkeley and its contributors''
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.\"	@(#)strsep.3	5.1 (Berkeley) 5/15/90
.\"
.TH STRSEP 3 "May 15, 1990"
.UC 7
.SH NAME
strsep \- separate strings
.SH SYNOPSIS
.nf
.ft B
#include <string.h>

char *
strsep(char **stringp, char *delim);
.ft R
.fi
.SH DESCRIPTION
.B Strsep
locates in the null-terminated string at
.I *stringp
the first occurence of any character in
.I delim
and replaces this with a '\e0',
records the location of the immediate following character in
.IR *stringp ,
then returns the original value of
.IR *stringp .
If no delimiter characters are found,
.B strsep
sets
.I *stringp
to NULL;
if
.I *stringp
is initially NULL,
.B strsep
returns NULL.
.SH EXAMPLES
The following uses
.I strsep
to parse strings containing runs of white space,
making up an argument vector:
.sp
.nf
.RS
char inputstring[100];
char **argv[51], **ap = argv, *p, *val;
.I "/* set up inputstring */"
for (p = inputstring; p != NULL; ) {
    while ((val = strsep(&p, " \et")) != NULL && *val == '\e0');
    *ap++ = val;
}
*ap = 0;
.RE