stringlist: fix division by zero ...

len is checked instead of num so when num is zero, we get a
division by zero a few lines later

Signed-off-by: Eric Bénard <eric@eukrea.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

stringlist: implement string_list_add_asprintf ...

Useful for allocating a string list entry on the fly.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

stringlist: use seperately allocated string ...

Allocate the string in string list seperately instead of
embedding a zero length string into struct stringlist.
Besides looking cleaner this allows us to implement a
string_list_asprintf.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

stringlist-functions: add sorted insert ...

Add sorted insert in stringlist functions.
Also added function to checked if string is already
in string list.

Signed-off-by: Alexander Aring <a.aring@phytec.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

stringlist: Fix printing on smaller consoles ...

Do not add additional space between strings, we already
did this by adding 4 to the string length.

Signed-off-by: Sascha Hauer <sha@pengutronix.de>

add stringlist function. They can be used to build a list ...

of strings. For now mainly useful to print the resulting
list in columns which is used in tab completion and ls.