Function parse

tools/sysctl/sysctl.c:499–723

* Parse a name into a MIB entry. * Lookup and print out the MIB entry if it exists. * Set a new value if requested. */

 * Set a new value if requested.
 */
static int
parse(const char *string, int lineno)
{
	int len, i, j, save_errno;
	const void *newval;
	char *newvalstr = NULL;
	void *newbuf;
	size_t newsize = Bflag;
	int mib[CTL_MAXNAME];
	char *cp, *bufp, *buf, fmt[BUFSIZ], line[BUFSIZ];
	u_int kind;

	if (lineno)
		snprintf(line, sizeof(line), " at line %d", lineno);
	else
		line[0] = '\0';

	/*
	 * Split the string into name and value.
	 *
	 * Either = or : may be used as the delimiter.
	 * Whitespace surrounding the delimiter is trimmed.
	 * Quotes around the value are stripped.
	 */
	cp = buf = strdup(string);
	bufp = strsep(&cp, "=:");
	if (cp != NULL) {
		/* Tflag just lists tunables, do not allow assignment */
		if (Tflag || Wflag) {
			warnx("Can't set variables when using -T or -W");
			usage();
		}
		/* Trim whitespace before the value. */
		while (isspace(*cp))
			cp++;
		/* Strip a pair of " or ' if any. */
		switch (*cp) {
		case '\"':
		case '\'':
			if (cp[strlen(cp) - 1] == *cp)
				cp[strlen(cp) - 1] = '\0';
			cp++;
		}
		newvalstr = cp;
		newsize = strlen(cp);
	}
	/* Trim whitespace after the name. */
	cp = bufp + strlen(bufp) - 1;
	while (cp >= bufp && isspace((int)*cp)) {
		*cp = '\0';
		cp--;
	}

	/*
	 * Check the name is a useable oid.
	 */
	len = name2oid(bufp, mib);
	if (len < 0) {