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In many places where kernel expects a NUL-terminated string of length
up to a known fixed limit, e.g. when a NUL-terminated string is
a fixed-size field of a structure, strace does not print the last byte
assuming it is NUL, which is not always the case.
Change output format for such strings to distinguish NUL-terminated
strings from non-NUL-terminated ones: append ellipsis to the output
when the string is not NUL-terminated.
* defs.h (print_quoted_cstring): New prototype.
* util.c (print_quoted_cstring): New function.
(printpathn): Use it instead of print_quoted_string with
QUOTE_0_TERMINATED argument.
* print_fields.h (PRINT_FIELD_CSTRING): Likewise.
* btrfs.c (btrfs_ioctl): Likewise.
* dirent.c (SYS_FUNC(getdents)): Likewise.
* dirent64.c (SYS_FUNC(getdents64)): Likewise.
* print_ifindex.c (print_ifindex): Likewise.
* sysmips.c (SYS_FUNC(sysmips)): Likewise.
* ubi.c (ubi_ioctl): Likewise.
* tests/tests.h (print_quoted_cstring): New prototype.
* tests/print_quoted_string.c (print_quoted_cstring): New function.
* tests/ioctl_block.c (main): Update expected output.
* tests/ioctl_dm.c (main): Likewise.
* tests/ioctl_loop.c (print_loop_info, print_loop_info64): Likewise.
* tests/netlink_crypto.c (test_crypto_msg_newalg): Likewise.
* tests/ioctl.c (main): Additional check for unknown ioctl command
decoding.
* tests/ioctl_evdev.c (main): Likewise.
* tests/ioctl_dm.c: Include <linux/ioctl.h> for _IOC_SIZE and _IOC_NR.
(main) <dummy_dm_ioctl1, dummy_dm_ioctl2, dummy_dm_arg>: New constants.
Add more checks for unknown command formatting.
Specifying output width for size argument is rather misleading - it can
be up to 14 bits in size. The use of explicit "0x" prefix is
discouraged because 0x0 looks ugly. Usage of width specification along
with alternate form flag leads to inconsistent output for 0.
Let's use just plain %#x qualifiers instead.
* ioctl.c (ioctl_print_code): Change printf qualifiers for ioctl command
type, number and size to "%#x".
* tests/ioctl.c (main): Update expected test output.
* tests/ioctl_dm.c (main): Likewise.
* tests/ioctl_evdev.c (main): Likewise.
