NAME
optstr_get
- Options string management
SYNOPSIS
bool
optstr_get(const char *optstr, const char *key, char *buf, size_t bufsize)
DESCRIPTION
An options string is a list of key/value pairs represented in textual form.
Each pair is expressed as
`'key=value''
and is separated from other pairs by one or more spaces.
For example:
key1=value1 key2=value2 key3=value3
Options strings are used to pass information between userland programs and
the kernel in a binary-agnostic way.
This makes them endianness and ABI independent.
FUNCTIONS
The following functions are provided to manage options strings:
- optstr_get(
optstr, key, buf, bufsize) -
Scans the
optstr
options string looking for the key
key
and stores its value in the buffer pointed to by
buf
copying a maximum of
bufsize
bytes.
Returns
`true'
if the key was found or
`false'
otherwise, in which case
buf
is left unmodified.
CODE REFERENCES
The options string management functions are implemented within the files
sys/kern/subr_optstr.c
and
sys/sys/optstr.h.
HISTORY
Options strings appeared in
NetBSD4.0.