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util/nvmutil: comment regarding buf

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Signed-off-by: Leah Rowe <leah@libreboot.org>
This commit is contained in:
Leah Rowe
2026-03-07 01:01:44 +00:00
parent 364abddeab
commit 0084452c4a
1 changed files with 15 additions and 1 deletions
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util/nvmutil/nvmutil.c
+15 -1
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@@ -119,7 +119,17 @@ static const char oldrandom[] = "/dev/random"; /* fallback on OLD unix */
static const char *rname = NULL;
#endif
static uint8_t buf[GBE_FILE_SIZE]; /* 8KB */
/*
* GbE files can be 8KB, 16KB or 128KB,
* but we only need the two 4KB parts
* from offset zero and offset 64KB in
* a 128KB file, or zero and 8KB in a 16KB
* file, or zero and 4KB in an 8KB file.
*
* The code will handle this properly.
*/
static uint8_t buf[GBE_FILE_SIZE];
static uint16_t mac_buf[3];
static off_t gbe_file_size;
@@ -504,6 +514,10 @@ set_mac_nib(size_t mac_str_pos, size_t mac_nib_pos)
static uint8_t
hextonum(char ch_s)
{
/*
* We assume char is signed, hence ch_s.
* We explicitly cast to unsigned:
*/
unsigned char ch = (unsigned char)ch_s;
if ((unsigned)(ch - '0') <= 9)