lib: errno: introduce errno_str(): returns errno related message

The functions error's numbers are standarized - but the error
messages are not.

The errors are often handled with unclear error messages,
so why not use an errno standarized messages.

Advantages:
- This could decrease the binary size.
- Appended with a detailed information,
  the error message will be clear.

This commit introduces new function:
- const char *errno_to_str(int errno)

The functions returns a pointer to the errno corresponding text message:
- if errno is null or positive number - a pointer to "Success" message
- if errno is negative - a pointer to errno related message

Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
Reviewed-by: Tom Rini <trini@ti.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/Makefile b/lib/Makefile
index 3ceb697..07d175f 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -51,6 +51,7 @@ endif
 obj-$(CONFIG_ADDR_MAP) += addr_map.o
 obj-y += hashtable.o
 obj-y += errno.o
+obj-$(CONFIG_ERRNO_STR) += errno_str.o
 obj-y += display_options.o
 obj-$(CONFIG_BCH) += bch.o
 obj-y += crc32.o