c - malloc problem? -

hello use malloc() generate buffer buffer char*

buffer = (char*)malloc(chunksize+1);   (k = 0; k < chunksize; k++) {     buffer[k] = (char) (j+k);   } 

however, in debugger can see buffer[3] example char wrote in, buffer buffer empty(a lot of spaces). second time write stuff in buffer after free(buffer), shows the content wrote first time, , overwrite it. can tell me why? thank you!!

one problem might try print char buffer printf or equivalent? missing assign

buffer[chunksize] = 0; 

so buffer not terminated. may have behind that, e.g '\r'.

if on other hand buffer doesn't represent string you, better use different base type, unsigned char.