System Information
Mac OS 10.9.2, Intel HD Graphics 4000 1024 MB

Blender Version
Broken: 2.70, 2014-Mar-19

Short description of error
The x_eq, y_eq, and z_eq fields truncate pasted input to 400 characters.

Exact steps for others to reproduce the error
(1) Copy a long (> 400) character string from a file
(2) Paste into the X equation parameter window
(3) String is truncated to 400 characters

As an example, here is a string I'd like to paste into the X equation field, but it gets truncated as an incomplete formula:

-0.200000000000000*((sin(u)2/sqrt(fabs(-sin(u))2 + fabs(cos(u))2 + 1) + cos(u)2/sqrt(fabs(-sin(u))2 + fabs(cos(u))2 + 1))*sin(u)/sqrt(fabs(-sin(u))2 + fabs(cos(u))2 + 1) - sin(u))*sin(v)/sqrt(fabs((sin(u)2/sqrt(fabs(-sin(u))2 + fabs(cos(u))2 + 1) + cos(u)2/sqrt(fabs(-sin(u))2 + fabs(cos(u))2 + 1))*cos(u)/sqrt(fabs(-sin(u))2 + fabs(cos(u))2 + 1) - cos(u))2 + fabs(-(sin(u)2/sqrt(fabs(-sin(u))2 + fabs(cos(u))2 + 1) + cos(u)2/sqrt(fabs(-sin(u))2 + fabs(cos(u))2 + 1))*sin(u)/sqrt(fabs(-sin(u))2 + fabs(cos(u))2 + 1) + sin(u))2 + fabs((sin(u)2/sqrt(fabs(-sin(u))2 + fabs(cos(u))2 + 1) + cos(u)2/sqrt(fabs(-sin(u))2 + fabs(cos(u))2 + 1))/sqrt(fabs(-sin(u))2 + fabs(cos(u))2 + 1))2) - 0.200000000000000*cos(u)*cos(v)/sqrt(fabs(-sin(u))2 + fabs(-cos(u))**2) + cos(u)