diff -Nurp qmailadmin-1.2.12/util.c qmailadmin-1.2.12.new/util.c
--- qmailadmin-1.2.12/util.c	2007-09-21 19:27:40.000000000 -0400
+++ qmailadmin-1.2.12.new/util.c	2009-07-11 01:54:02.000000000 -0400
@@ -19,10 +19,11 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <stddef.h>
+#include <errno.h>
 #include <string.h>
 #include <unistd.h>
 #include <sys/stat.h>
-#include <unistd.h>
 #include <pwd.h>
 #include <dirent.h>
 #include <ctype.h>
@@ -352,41 +353,70 @@ char *get_quota_used(char *dir) {
                    back to bytes for vpasswd file
    return value: 0 for success, 1 for failure
 */
-int quota_to_bytes(char returnval[], char *quota) {
+int quota_to_bytes(char returnval[], const char *quota) {
     double tmp;
+    int err = 0;
 
     if (quota == NULL) { return 1; }
-    if ((tmp = atof(quota))) {
-        tmp *= 1048576;
-        sprintf(returnval, "%.0lf", tmp);
-        return 0;
+
+    /* first set errno to 0 to determine if an error occurs */
+    errno = 0;
+    tmp = strtod(quota, NULL);
+    err = errno;
+    if (err != 0) {
+        perror("quota_to_bytes");
+        return 1;
     } else {
-	strcpy (returnval, "");
-	return 1;
+        tmp *= (1024*1024);
+        err = sprintf(returnval, "%.0lf", tmp);
+        if (err > 0) {
+            return 0;
+        } else {
+            returnval[0] = '\0';
+            return 1;
+        }
     }
 }
 /* quota_to_megabytes: used to convert vpasswd representation of quota
                        to number of megabytes.
    return value: 0 for success, 1 for failure
 */
-int quota_to_megabytes(char *returnval, char *quota) {
+int quota_to_megabytes(char *returnval, const char *quota) {
     double tmp;
-    int i;
+    int err = 0;
+    size_t i;
 
     if (quota == NULL) { return 1; }
     i = strlen(quota);
+
+    errno = 0;
+    tmp = strtod(quota, NULL);
+    err = errno;
+    if (err != 0) {
+        perror("quota_to_megabytes");
+        return 1;
+    }
+
     if ((quota[i-1] == 'M') || (quota[i-1] == 'm')) {
-        tmp = atol(quota);  /* already in megabytes */
+        /* already in megabytes */
     } else if ((quota[i-1] == 'K') || (quota[i-1] == 'k')) {
-	tmp = atol(quota) * 1024;  /* convert kilobytes to megabytes */
-    } else if ((tmp = atol(quota))) {
-        tmp /= 1048576.0;
+        /* convert kilobytes to megabytes */
+        tmp *= 1024;
+    } else if (tmp != 0) {
+        /* convert bytes to megabytes */
+        tmp /= (1024*1024);
     } else {
-	strcpy (returnval, "");
-	return 1;
+        returnval[0] = '\0';
+        return 1;
+    }
+
+    err = sprintf(returnval, "%.2lf", tmp);
+    if (err > 0) {
+        return 0;
+    } else {
+        returnval[0] = '\0';
+        return 1;
     }
-    sprintf(returnval, "%.2lf", tmp);
-    return 0;
 }
 
 void print_user_index (char *action, int colspan, char *user, char *dom, time_t mytime)
diff -Nurp qmailadmin-1.2.12/util.h qmailadmin-1.2.12.new/util.h
--- qmailadmin-1.2.12/util.h	2007-09-21 19:27:40.000000000 -0400
+++ qmailadmin-1.2.12.new/util.h	2009-07-11 02:02:45.000000000 -0400
@@ -25,8 +25,8 @@ void str_replace (char *, char, char);
 
 void qmail_button(char *modu, char *command, char *user, char *dom, time_t mytime, char *png);
 
-int quota_to_bytes(char[], char*);     //jhopper prototype
-int quota_to_megabytes(char[], char*); //jhopper prototype
+int quota_to_bytes(char[], const char*);     //jhopper prototype
+int quota_to_megabytes(char[], const char*); //jhopper prototype
 
 void print_user_index (char *action, int colspan, char *user, char *dom, time_t mytime);
 char *cgiurl (char *action);