Image Processing

I am doing image processing with Pgm files.I need to know how to resize my PGM image in C or C++???
yes i want to resize my 85*85 image at 92*112.
or random image size would be greater to my standard size but i want to scale all images at 92*112 using c or C++
no i can use any library
but i would prefer if someone help me in C code
At now i m using single C code ...!!
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