[U-Boot,4/5] vsprintf.c: add GUID printing

This works (roughly) the same way as linux's, but we currently always
print lower-case (ie. we just keep %pUB and %pUL for compat with linux),
mostly just because that is what uuid_bin_to_str() supports.

  %pUb:   01020304-0506-0708-090a-0b0c0d0e0f10
  %pUl:   04030201-0605-0807-090a-0b0c0d0e0f10

It will be used by a later efi_loader paths for efi variables and for
device-path-to-text protocol, and also quite useful for debug prints
of protocol GUIDs.

Signed-off-by: Rob Clark <robdclark@gmail.com>
---
 examples/api/Makefile      |  1 +
 include/config_fallbacks.h |  1 +
 lib/vsprintf.c             | 46 ++++++++++++++++++++++++++++++++++++++++++++--
 3 files changed, 46 insertions(+), 2 deletions(-)

On 08/10/2017 01:14 AM, Rob Clark wrote:
> This works (roughly) the same way as linux's, but we currently always
> print lower-case (ie. we just keep %pUB and %pUL for compat with linux),
> mostly just because that is what uuid_bin_to_str() supports.
> 
>   %pUb:   01020304-0506-0708-090a-0b0c0d0e0f10
>   %pUl:   04030201-0605-0807-090a-0b0c0d0e0f10
> 
> It will be used by a later efi_loader paths for efi variables and for
> device-path-to-text protocol, and also quite useful for debug prints
> of protocol GUIDs.
> 
> Signed-off-by: Rob Clark <robdclark@gmail.com>
> ---
>  examples/api/Makefile      |  1 +
>  include/config_fallbacks.h |  1 +
>  lib/vsprintf.c             | 46 ++++++++++++++++++++++++++++++++++++++++++++--
>  3 files changed, 46 insertions(+), 2 deletions(-)
> 
> diff --git a/examples/api/Makefile b/examples/api/Makefile
> index 87c15d0f68..899527267d 100644
> --- a/examples/api/Makefile
> +++ b/examples/api/Makefile
> @@ -35,6 +35,7 @@ EXT_COBJ-y += lib/string.o
>  EXT_COBJ-y += lib/time.o
>  EXT_COBJ-y += lib/vsprintf.o
>  EXT_COBJ-y += lib/charset.o
> +EXT_COBJ-$(CONFIG_LIB_UUID) += lib/uuid.o
>  EXT_SOBJ-$(CONFIG_PPC) += arch/powerpc/lib/ppcstring.o
>  ifeq ($(ARCH),arm)
>  EXT_SOBJ-$(CONFIG_USE_ARCH_MEMSET) += arch/arm/lib/memset.o
> diff --git a/include/config_fallbacks.h b/include/config_fallbacks.h
> index 961a83d758..56b9de09f2 100644
> --- a/include/config_fallbacks.h
> +++ b/include/config_fallbacks.h
> @@ -57,6 +57,7 @@
>  
>  #if (CONFIG_IS_ENABLED(PARTITION_UUIDS) || \
>  	CONFIG_IS_ENABLED(EFI_PARTITION) || \
> +	CONFIG_IS_ENABLED(EFI_LOADER) || \
>  	defined(CONFIG_RANDOM_UUID) || \
>  	defined(CONFIG_CMD_UUID) || \
>  	defined(CONFIG_BOOTP_PXE)) && \
> diff --git a/lib/vsprintf.c b/lib/vsprintf.c
> index 0678b49b01..71a995dee0 100644
> --- a/lib/vsprintf.c
> +++ b/lib/vsprintf.c
> @@ -18,6 +18,7 @@
>  
>  #include <common.h>
>  #include <charset.h>
> +#include <uuid.h>
>  
>  #include <div64.h>
>  #define noinline __attribute__((noinline))
> @@ -366,6 +367,40 @@ static char *ip4_addr_string(char *buf, char *end, u8 *addr, int field_width,
>  }
>  #endif
>  
> +#ifdef CONFIG_LIB_UUID
> +/*
> + * This works (roughly) the same way as linux's, but we currently always
> + * print lower-case (ie. we just keep %pUB and %pUL for compat with linux),
> + * mostly just because that is what uuid_bin_to_str() supports.
> + *
> + *   %pUb:   01020304-0506-0708-090a-0b0c0d0e0f10
> + *   %pUl:   04030201-0605-0807-090a-0b0c0d0e0f10
> + */
> +static char *uuid_string(char *buf, char *end, u8 *addr, int field_width,
> +			 int precision, int flags, const char *fmt)
> +{
> +	char uuid[UUID_STR_LEN + 1];
> +	int str_format = UUID_STR_FORMAT_STD;
> +
> +	switch (*(++fmt)) {
> +	case 'L':
> +	case 'l':
> +		str_format = UUID_STR_FORMAT_GUID;
> +		break;
> +	case 'B':
> +	case 'b':
> +		/* this is the default */
> +		break;
> +	default:
> +		break;
> +	}
> +
> +	uuid_bin_to_str(addr, uuid, str_format);
> +
> +	return string(buf, end, uuid, field_width, precision, flags);
> +}
> +#endif
> +
>  /*
>   * Show a '%p' thing.  A kernel extension is that the '%p' is followed
>   * by an extra set of alphanumeric characters that are extended format
> @@ -399,8 +434,8 @@ static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
>  			      flags);
>  #endif
>  
> -#ifdef CONFIG_CMD_NET
>  	switch (*fmt) {
> +#ifdef CONFIG_CMD_NET
>  	case 'a':
>  		flags |= SPECIAL | ZEROPAD;
>  
> @@ -430,8 +465,15 @@ static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
>  					       precision, flags);
>  		flags &= ~SPECIAL;
>  		break;
> -	}
>  #endif
> +#ifdef CONFIG_LIB_UUID
> +	case 'U':
> +		return uuid_string(buf, end, ptr, field_width, precision,
> +				   flags, fmt);
> +#endif
> +	default:
> +		break;
> +	}
>  	flags |= SMALL;
>  	if (field_width == -1) {
>  		field_width = 2*sizeof(void *);
> 

Successfully tested printing using %pUl with a patch under development
on arm64.

Tested-by: Heinrich Schuchardt <xypron.glpk@gmx.de>