add osmo_str_tolower() and _toupper() with test

We already have osmo_str2lower() and osmo_str2upper(), but these lack:
* proper destination buffer bounds checking,
* ability to call directly as printf() argument.

Deprecate osmo_str2upper() and osmo_str2lower() because of missing bounds
checking.

Introduce osmo_str_tolower_buf(), osmo_str_toupper_buf() to provide
bounds-safe conversion, also able to safely convert a buffer in-place.

Introduce osmo_str_tolower(), osmo_str_toupper() that call the above _buf()
equivalents using a static buffer[128] and returning the resulting string
directly, convenient for direct printing. Possibly truncated but always safe.

Add unit tests to utils_test.c.

Replace all libosmocore uses of now deprecated osmo_str2lower().

Naming: the ctype.h API is called tolower() and toupper(), so just prepend
'osmo_str_' and don't separate 'to_lower'.

Change-Id: Ib0ee1206b9f31d7ba25c31f8008119ac55440797

0 files changed, 0 insertions, 0 deletions