diff --git a/input.c b/input.c
index cfe80b1..517522b 100644
--- a/input.c
+++ b/input.c
@@ -1,29 +1,31 @@
 #include "input.h"
 
-#define PADDING '='
+#define PADDING  '='
+#define OCTETBUF  3
+#define SXTETBUF  4
 
 int
-getocts(FILE *fp, unsigned char *o, int olen)
+getocts(FILE *fp, unsigned char *o)
 {
     int c, n;
 
     n = 0;
-    while (n < olen-1 && (c = fgetc(fp)) != EOF)
+    while (n < OCTETBUF && (c = fgetc(fp)) != EOF)
         o[n++] = c;
 
     return n;
 }
 
 int
-getsxts(FILE *fp, unsigned char *s, int slen)
+getsxts(FILE *fp, unsigned char *s)
 {
     int c, n, pad;
 
     n = pad = 0;
-    while (n < slen-1 && (c = fgetc(fp)) != EOF && c != PADDING)
+    while (n < SXTETBUF && (c = fgetc(fp)) != EOF && c != PADDING)
         if (c != '\n')
             s[n++] = c;
-    while (n+pad < slen-1)
+    while (n+pad < SXTETBUF)
         s[n+pad++] = PADDING;
 
     return n;
diff --git a/input.h b/input.h
index d859cbd..2238695 100644
--- a/input.h
+++ b/input.h
@@ -4,9 +4,9 @@
 #include <stdio.h>
 
 int
-getocts(FILE *fp, unsigned char *o, int olen);
+getocts(FILE *fp, unsigned char *o);
 
 int
-getsxts(FILE *fp, unsigned char *s, int slen);
+getsxts(FILE *fp, unsigned char *s);
 
 #endif
diff --git a/main.c b/main.c
index 0cf51bc..c2017bf 100644
--- a/main.c
+++ b/main.c
@@ -4,11 +4,11 @@
 #include "output.h"
 #include "encode.h"
 
-#define OBUFSIZE 4
-#define SBUFSIZE 5
+#define OCTETBUF 4
+#define SXTETBUF 5
 
-unsigned char obuf[OBUFSIZE];
-unsigned char sbuf[SBUFSIZE];
+unsigned char obuf[OCTETBUF];
+unsigned char sbuf[SXTETBUF];
 
 int
 main(int argc, char *argv[])
@@ -51,12 +51,12 @@ main(int argc, char *argv[])
             exit(EXIT_FAILURE);
         }
         if (dec) {
-            while ((n = getsxts((argc >= 1) ? in : stdin, sbuf, SBUFSIZE))) {
+            while ((n = getsxts((argc >= 1) ? in : stdin, sbuf))) {
                 n = decode(sbuf, n, obuf, url);
                 fwrite(obuf, sizeof(*obuf), n, (argc == 2) ? out : stdout);
             }
         } else {
-            while ((n = getocts((argc >= 1) ? in : stdin, obuf, OBUFSIZE))) {
+            while ((n = getocts((argc >= 1) ? in : stdin, obuf))) {
                 if (wrp) {
                     n = encode(obuf, n, sbuf, url);
                     l = printw((argc == 2) ? out : stdout, sbuf, n);