CHECK: Unnecessary parentheses around 'cnum[i]'
CHECK: spaces preferred around that '-' (ctx:VxV)
WARNING: else is not generally useful after a break or return
WARNING: line length of 81 exceeds 80 columns
WARNING: line length of 82 exceeds 80 columns
WARNING: line length of 83 exceeds 80 columns
WARNING: line length of 84 exceeds 80 columns
WARNING: line length of 85 exceeds 80 columns
WARNING: line length of 90 exceeds 80 columns
WARNING: line length of 94 exceeds 80 columns
WARNING: line length of 95 exceeds 80 columns
WARNING: return of an errno should typically be negative (ie: return -EMPTY)