If it is that urgent, why not google it?
Seems to be at hit # 3 or 4.
http://www.amazon.com/Programming-Language-2nd-Brian-Kernighan/dp/0131103628 is your classic K & R C book.
I own version 1 and 2. Definitely something to have on the shelf but if I recall, if you google it, you might find it in ebook form.
Module: Fundamentals of Computing
Foundations of Computing Customised Edition of C-DAC Courses
P K Sinha, Priti Sinha
Module: Programming in C
Book Title: Programming in Ansi C, 2nd Edition
C-DAC's Advanced Computing Training
E Balagurusamy C-DAC - Tata Mc Graw-Hill Series