OpenGL 3.3 Shaders: syntax error, unexpected $undefined at t

// Before - Broken
const char* vertTmp = vertContents.c_str();
const char* fragTmp = fragContents.c_str();
glShaderSource( vert, 1, &vertTmp, NULL ); // If it's NULL, then the string is NULL-terminated
glShaderSource( frag, 1, &fragTmp, NULL );

// After - Fixed
const char* vertTmp = vertContents.c_str(); int vertLen = vertContents.length()-1;
const char* fragTmp = fragContents.c_str(); int fragLen = fragContents.length()-1;
glShaderSource( vert, 1, &vertTmp, &vertLen ); // Telling it the length of the string, or length - 1 ?
glShaderSource( frag, 1, &fragTmp, &fragLen );