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Make use of strerror(errno) and format all errors equally:
function ['parameters']: error message
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Replace warn() and warnx() with fprintf() and add <stdio.h> where
necessary.
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Replace #ifdef with #if defined() and #elif with #elif defined() as it
should only test if it is defined or not.
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When an invalid interface name is passed to wifi_essid() it does not
close opened sockets.
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Implement basic percentage calculation for wifi_perc. With this
commit, the function returns correct percentage, since the max
of what /proc/net/wireless returns is 70.
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This brings us a lot more tidiness.
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