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command: Add constants for cmd_get_data_size string / error

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At present these values are open-coded in a few places. Add constants so
the meaning is clear.

Also add a comment to cmd_get_data_size()

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2020-11-01 14:15:36 -07:00 • committed by Tom Rini
parent 90a9901764
commit 7526deec7e
4 changed files with 30 additions and 6 deletions
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26
include/command.h
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@ -117,7 +117,31 @@ int cmd_process_error(struct cmd_tbl *cmdtp, int err);
defined(CONFIG_CMD_PCI) || \
defined(CONFIG_CMD_SETEXPR)
#define CMD_DATA_SIZE
extern int cmd_get_data_size(char* arg, int default_size);
#define CMD_DATA_SIZE_ERR (-1)
#define CMD_DATA_SIZE_STR (-2)
/**
* cmd_get_data_size() - Get the data-size specifier from a command
*
* This reads a '.x' size specifier appended to a command. For example 'md.b'
* is the 'md' command with a '.b' specifier, meaning that the command should
* use bytes.
*
* Valid characters are:
*
* b - byte
* w - word (16 bits)
* l - long (32 bits)
* q - quad (64 bits)
* s - string
*
* @arg: Pointers to the command to check. If a valid specifier is present it
* will be the last character of the string, following a '.'
* @default_size: Default size to return if there is no specifier
* @return data size in bytes (1, 2, 4, 8) or CMD_DATA_SIZE_ERR for an invalid
* character, or CMD_DATA_SIZE_STR for a string
*/
int cmd_get_data_size(char *arg, int default_size);
#endif
#ifdef CONFIG_CMD_BOOTD