diff --git a/libc/dns/resolv/res_debug.c b/libc/dns/resolv/res_debug.c
index 7a05a5f..5f889cb 100644
--- a/libc/dns/resolv/res_debug.c
+++ b/libc/dns/resolv/res_debug.c
@@ -126,14 +126,6 @@
 #include <strings.h>
 #include <time.h>
 
-
-
-#ifdef SPRINTF_CHAR
-# define SPRINTF(x) strlen(sprintf/**/x)
-#else
-# define SPRINTF(x) sprintf x
-#endif
-
 extern const char * const _res_opcodes[];
 extern const char * const _res_sectioncodes[];
 
@@ -588,7 +580,7 @@
 		}
 	}
 
-	sprintf(unname, "%d", number);		/* XXX nonreentrant */
+	snprintf(unname, sizeof(unname), "%d", number);		/* XXX nonreentrant */
 	if (success)
 		*success = 0;
 	return (unname);
@@ -605,7 +597,7 @@
 			return (syms->humanname);
 		}
 	}
-	sprintf(unname, "%d", number);		/* XXX nonreentrant */
+	snprintf(unname, sizeof(unname), "%d", number);		/* XXX nonreentrant */
 	if (success)
 		*success = 0;
 	return (unname);
@@ -625,7 +617,7 @@
 		return (result);
 	if (type < 0 || type > 0xffff)
 		return ("BADTYPE");
-	sprintf(typebuf, "TYPE%d", type);
+	snprintf(typebuf, sizeof(typebuf), "TYPE%d", type);
 	return (typebuf);
 }
 
@@ -661,7 +653,7 @@
 		return (result);
 	if (class < 0 || class > 0xffff)
 		return ("BADCLASS");
-	sprintf(classbuf, "CLASS%d", class);
+	snprintf(classbuf, sizeof(classbuf), "CLASS%d", class);
 	return (classbuf);
 }
 
@@ -703,7 +695,7 @@
 	case RES_NO_NIBBLE2:	return "no-nibble2";
 #endif
 				/* XXX nonreentrant */
-	default:		sprintf(nbuf, "?0x%lx?", (u_long)option);
+	default:		snprintf(nbuf, sizeof(nbuf), "?0x%lx?", (u_long)option);
 				return (nbuf);
 	}
 }
@@ -716,7 +708,7 @@
 	static char nbuf[40];		/* XXX nonreentrant */
 
 	if (ns_format_ttl((u_long)value, nbuf, sizeof nbuf) < 0)
-		sprintf(nbuf, "%u", value);
+		snprintf(nbuf, sizeof(nbuf), "%u", value);
 	return (nbuf);
 }
 
@@ -745,7 +737,7 @@
 		break;
 #endif
 	default:
-		sprintf(ret, "[af%d]", u.sin.sin_family);
+		snprintf(ret, sizeof(ret), "[af%d]", u.sin.sin_family);
 		break;
 	}
 	if (size > 0U) {
@@ -777,7 +769,7 @@
 
 	val = mantissa * poweroften[exponent];
 
-	(void) sprintf(retbuf, "%lu.%.2lu", val/100, val%100);
+	(void) snprintf(retbuf, sizeof(retbuf), "%lu.%.2lu", val/100, val%100);
 	return (retbuf);
 }
 
@@ -1028,7 +1020,7 @@
 
 /* takes an on-the-wire LOC RR and formats it in a human readable format. */
 const char *
-loc_ntoa(const u_char *binary, char *ascii)
+loc_ntoa(const u_char *binary, char *ascii, size_t bufsiz)
 {
 	static const char *error = "?";
 	static char tmpbuf[sizeof
@@ -1055,7 +1047,7 @@
 		ascii = tmpbuf;
 
 	if (versionval) {
-		(void) sprintf(ascii, "; error: unknown LOC RR version");
+		(void) snprintf(ascii, bufsiz, "; error: unknown LOC RR version");
 		return (ascii);
 	}
 
@@ -1114,7 +1106,7 @@
 	hpstr = strdup(precsize_ntoa((u_int32_t)hpval));
 	vpstr = strdup(precsize_ntoa((u_int32_t)vpval));
 
-	sprintf(ascii,
+	snprintf(ascii, bufsiz,
 	    "%d %.2d %.2d.%.3d %c %d %.2d %.2d.%.3d %c %s%d.%.2dm %sm %sm %sm",
 		latdeg, latmin, latsec, latsecfrac, northsouth,
 		longdeg, longmin, longsec, longsecfrac, eastwest,
@@ -1180,7 +1172,7 @@
 #endif
 	mytime->tm_year += 1900;
 	mytime->tm_mon += 1;
-	sprintf(output, "%04d%02d%02d%02d%02d%02d",
+	snprintf(output, sizeof(output), "%04d%02d%02d%02d%02d%02d",
 		mytime->tm_year, mytime->tm_mon, mytime->tm_mday,
 		mytime->tm_hour, mytime->tm_min, mytime->tm_sec);
 	return (output);