sysctl(8): make WARNS=3 clean

Fixes inspired by work done in DragonflyBSD.

PR:		bin/140016
Approved by:	ed (Co-mentor)

2 files changed, 18 insertions, 12 deletions

diff --git a/sbin/sysctl/Makefile b/sbin/sysctl/Makefile
index 381f19918be3..06ff9b482d69 100644
--- a/sbin/sysctl/Makefile
+++ b/sbin/sysctl/Makefile
@@ -2,7 +2,7 @@
 # $FreeBSD$
 
 PROG=	sysctl
-WARNS?=	0
+WARNS?=	3
 MAN=	sysctl.8
 
 .include <bsd.prog.mk>
diff --git a/sbin/sysctl/sysctl.c b/sbin/sysctl/sysctl.c
index b450f2d267ae..5d0025bbcb1c 100644
--- a/sbin/sysctl/sysctl.c
+++ b/sbin/sysctl/sysctl.c
@@ -279,7 +279,10 @@ parse(char *string)
 			case CTLTYPE_STRING:
 				break;
 			case CTLTYPE_QUAD:
-				sscanf(newval, "%qd", &quadval);
+				quadval = strtoq(newval, &endptr, 0);
+				if (endptr == newval || *endptr != '\0')
+					errx(1, "invalid quad integer"
+					    " '%s'", (char *)newval);
 				newval = &quadval;
 				newsize = sizeof(quadval);
 				break;
@@ -334,7 +337,7 @@ S_clockinfo(int l2, void *p)
 	struct clockinfo *ci = (struct clockinfo*)p;
 
 	if (l2 != sizeof(*ci)) {
-		warnx("S_clockinfo %d != %d", l2, sizeof(*ci));
+		warnx("S_clockinfo %d != %zu", l2, sizeof(*ci));
 		return (1);
 	}
 	printf(hflag ? "{ hz = %'d, tick = %'d, profhz = %'d, stathz = %'d }" :
@@ -349,7 +352,7 @@ S_loadavg(int l2, void *p)
 	struct loadavg *tv = (struct loadavg*)p;
 
 	if (l2 != sizeof(*tv)) {
-		warnx("S_loadavg %d != %d", l2, sizeof(*tv));
+		warnx("S_loadavg %d != %zu", l2, sizeof(*tv));
 		return (1);
 	}
 	printf(hflag ? "{ %'.2f %'.2f %'.2f }" : "{ %.2f %.2f %.2f }",
@@ -367,7 +370,7 @@ S_timeval(int l2, void *p)
 	char *p1, *p2;
 
 	if (l2 != sizeof(*tv)) {
-		warnx("S_timeval %d != %d", l2, sizeof(*tv));
+		warnx("S_timeval %d != %zu", l2, sizeof(*tv));
 		return (1);
 	}
 	printf(hflag ? "{ sec = %'jd, usec = %'ld } " :
@@ -389,7 +392,7 @@ S_vmtotal(int l2, void *p)
 	int pageKilo = getpagesize() / 1024;
 
 	if (l2 != sizeof(*v)) {
-		warnx("S_vmtotal %d != %d", l2, sizeof(*v));
+		warnx("S_vmtotal %d != %zu", l2, sizeof(*v));
 		return (1);
 	}
 
@@ -421,7 +424,7 @@ T_dev_t(int l2, void *p)
 	dev_t *d = (dev_t *)p;
 
 	if (l2 != sizeof(*d)) {
-		warnx("T_dev_T %d != %d", l2, sizeof(*d));
+		warnx("T_dev_T %d != %zu", l2, sizeof(*d));
 		return (1);
 	}
 	printf("%s", devname(*d, S_IFCHR));
@@ -518,7 +521,7 @@ oidfmt(int *oid, int len, char *fmt, u_int *kind)
 	j = sizeof(buf);
 	i = sysctl(qoid, len + 2, buf, &j, 0, 0);
 	if (i)
-		err(1, "sysctl fmt %d %d %d", i, j, errno);
+		err(1, "sysctl fmt %d %zu %d", i, j, errno);
 
 	if (kind)
 		*kind = *(u_int *)buf;
@@ -551,6 +554,9 @@ show_var(int *oid, int nlen)
 	u_int kind;
 	int (*func)(int, void *);
 
+	/* Silence GCC. */
+	umv = mv = intlen = 0;
+
 	bzero(buf, BUFSIZ);
 	bzero(name, BUFSIZ);
 	qoid[0] = 0;
@@ -560,7 +566,7 @@ show_var(int *oid, int nlen)
 	j = sizeof(name);
 	i = sysctl(qoid, nlen + 2, name, &j, 0, 0);
 	if (i || !j)
-		err(1, "sysctl name %d %d %d", i, j, errno);
+		err(1, "sysctl name %d %zu %d", i, j, errno);
 
 	if (Nflag) {
 		printf("%s", name);
@@ -611,7 +617,7 @@ show_var(int *oid, int nlen)
 	case 'A':
 		if (!nflag)
 			printf("%s%s", name, sep);
-		printf("%.*s", len, p);
+		printf("%.*s", (int)len, p);
 		free(oval);
 		return (0);
 
@@ -698,7 +704,7 @@ show_var(int *oid, int nlen)
 		}
 		if (!nflag)
 			printf("%s%s", name, sep);
-		printf("Format:%s Length:%d Dump:0x", fmt, len);
+		printf("Format:%s Length:%zu Dump:0x", fmt, len);
 		while (len-- && (xflag || p < val + 16))
 			printf("%02x", *p++);
 		if (!xflag && len > 16)
@@ -734,7 +740,7 @@ sysctl_all(int *oid, int len)
 			if (errno == ENOENT)
 				return (0);
 			else
-				err(1, "sysctl(getnext) %d %d", j, l2);
+				err(1, "sysctl(getnext) %d %zu", j, l2);
 		}
 
 		l2 /= sizeof(int);