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firewire: core: fw_csr_string addendum

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Witespace and comment changes, and a different way to say i + 1 < end.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Stefan Richter 2009-12-26 01:43:21 +01:00
parent 1f8fef7b33
commit 3c2c58cb33
2 changed files with 16 additions and 11 deletions
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26
drivers/firewire/core-device.c
View File

@ -69,19 +69,22 @@ static u32 *search_leaf(u32 *directory, int search_key)
if (last_key == search_key &&
key == (CSR_DESCRIPTOR | CSR_LEAF))
return ci.p - 1 + value;
last_key = key;
}
return NULL;
}
static int textual_leaf_to_string(u32 *block, char *buf, size_t size)
{
unsigned int quadlets, length;
unsigned int quadlets, i;
char c;
if (!size || !buf)
return -EINVAL;
quadlets = min(block[0] >> 16, 256u);
quadlets = min(block[0] >> 16, 256U);
if (quadlets < 2)
return -ENODATA;
@ -91,31 +94,34 @@ static int textual_leaf_to_string(u32 *block, char *buf, size_t size)
block += 3;
quadlets -= 2;
for (length = 0; length < quadlets * 4 && length + 1 < size; length++) {
char c = block[length / 4] >> (24 - 8 * (length % 4));
for (i = 0; i < quadlets * 4 && i < size - 1; i++) {
c = block[i / 4] >> (24 - 8 * (i % 4));
if (c == '\0')
break;
buf[length] = c;
buf[i] = c;
}
buf[length] = '\0';
return length;
buf[i] = '\0';
return i;
}
/**
* fw_csr_string - reads a string from the configuration ROM
* @directory: device or unit directory;
* fw_device->config_rom+5 or fw_unit->directory
* @directory: e.g. root directory or unit directory
* @key: the key of the preceding directory entry
* @buf: where to put the string
* @size: size of @buf, in bytes
*
* Returns string length (>= 0) or error code (< 0).
* The string is taken from a minimal ASCII text descriptor leaf after
* the immediate entry with @key. The string is zero-terminated.
* Returns strlen(buf) or a negative error code.
*/
int fw_csr_string(u32 *directory, int key, char *buf, size_t size)
{
u32 *leaf = search_leaf(directory, key);
if (!leaf)
return -ENOENT;
return textual_leaf_to_string(leaf, buf, size);
}
EXPORT_SYMBOL(fw_csr_string);

1
include/linux/firewire.h
View File

@ -71,7 +71,6 @@ struct fw_csr_iterator {
void fw_csr_iterator_init(struct fw_csr_iterator *ci, u32 *p);
int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value);
int fw_csr_string(u32 *directory, int key, char *buf, size_t size);
extern struct bus_type fw_bus_type;