__Pyx_decode_c_string: check for overflow when calling strlen.
__Pyx_decode_c_string: check for overflow when calling strlen.

Fixes http://trac.cython.org/ticket/864.

--HG--
extra : amend_source : d2a97da4f942d555723b9bfa488985c5e5c27721

scoder/cython,cython/cython,fabianrost84/cython,scoder/cython,da-woods/cython,mcanthony/cython,c-blake/cython,hickford/cython,cython/cython,acrispin/cython,hhsprings/cython,c-blake/cython,mrGeen/cython,fabianrost84/cython,da-woods/cython,fabianrost84/cython,ChristopherHogan/cython,ChristopherHogan/cython,fabianrost84/cython,acrispin/cython,hhsprings/cython,mrGeen/cython,scoder/cython,cython/cython,da-woods/cython,mrGeen/cython,hickford/cython,hhsprings/cython,fperez/cython,fperez/cython,mcanthony/cython,fperez/cython,da-woods/cython,fabianrost84/cython,hickford/cython,mcanthony/cython,hickford/cython,acrispin/cython,mcanthony/cython,c-blake/cython,mcanthony/cython,c-blake/cython,acrispin/cython,fperez/cython,c-blake/cython,mrGeen/cython,scoder/cython,hickford/cython,mrGeen/cython,acrispin/cython,fperez/cython,hhsprings/cython,ChristopherHogan/cython,cython/cython,hhsprings/cython