increase readability of input.{c,h}

input.c

@@ -3,27 +3,30 @@
 #define PADDING  '='
 
 int
-readb(FILE *fp, unsigned char *s, int slen)
+readb(FILE *fptr, unsigned char *buf, int bufsize)
 {
-    int read, tread;
-    unsigned char *send, *sbeg;
-    unsigned char *l, *r;
+    int read;
+    int total;
+    unsigned char *begin;
+    unsigned char *end;
+    unsigned char *left;
+    unsigned char *right;
     
-    read = tread = 0;
-    sbeg = l = r = s;
-    while (tread < slen && (read = fread(l, sizeof(*l), slen-tread, fp))) {
-        tread += read;
-        send = s + tread;
-        for (r = l; r < send; ++r)
-            if (*r != '\n')
-                *l++ = *r;
-        tread -= r - l;
-        if (l > sbeg) {
-            for (--l; *l == PADDING; --l)
-                ;
-            ++l;
-        }
+    read = total = 0;
+    begin = left = buf;
+    while (total < bufsize && (read = fread(left, sizeof(*left), bufsize-total, fptr))) {
+        total += read;
+        end = buf + total;
+        for (right = left; right < end; ++right)
+            if (*right != '\n')
+                *left++ = *right;
+        total -= right - left;
+    }
+    if (left > begin) {
+        for (--left; *left == PADDING; --left)
+            ;
+        ++left;
     }
 
-    return l-sbeg;
+    return left-begin;
 }

input.h

@@ -4,6 +4,6 @@
 #include <stdio.h>
 
 int
-readb(FILE *fp, unsigned char *s, int slen);
+readb(FILE *fptr, unsigned char *buf, int bufsize);
 
 #endif