cmd: printf: add helper functions from busybox
Import the following helper functions from Busybox-1.33.1 which are required by printf.c: process_escape_sequence from libbb/process_escape_sequence.c, skip_whitespace from libbb/skip_whitespace.c, overlapping_strcpy from libbb/safe_strncpy.c src-url: https://git.busybox.net/busybox/ commit bcc5b0e6caca6c7602a6a41f "Bump version to 1.33.1" version: 1.33.1 Signed-off-by: NRoland Gaudig <roland.gaudig@weidmueller.com>
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