[cs631apue] Trouble sorting with qsort

[Tejas Nadkarni]

It might be a stupid mistake but I'm puzzled. I'm trying to sort an array
of strings which is the file listing for a directory. Based on manpages,
online docs and forums I'm using the write code and it executes without
errors. However the resulting array is not sorted properly. qsort is a void
function so no way to tell if it's erroring out during the sort.

Here's my call

qsort(input, size, sizeof(char*), (int(*)(const void*, const void*))strcmp);

input is my char* array, size is the # of elements in input, sizeof(char*)
size of each element, the last parameter is casting strcmp for const void
since that's what's needed by qsort. I've also tried writing my own compare
function with strcmp in it and I get same results.

It's quite puzzling.

Here's an example output before and after qsort by running ls on /sys on
Ubuntu so it's doing something but almost like it's not completing the
sort?? Any ideas?

$ ./ls /sys
fs
devices
dev
bus
class
firmware
hypervisor
kernel
power
module
block


firmware
hypervisor
kernel
power
fs
module
devices
block
dev
bus
class
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