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util/nvmutil: rename len to nrw in i/o

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consistent with prw()

i prefer nrw (number of rw operations)

Signed-off-by: Leah Rowe <leah@libreboot.org>
This commit is contained in:
Leah Rowe
2026-03-13 14:48:52 +00:00
parent 5ece694e67
commit d8be79432c
1 changed files with 13 additions and 13 deletions
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util/nvmutil/nvmutil.c
+13 -13
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@@ -1544,7 +1544,7 @@ gbe_x_offset(size_t p, const char *f_op, const char *d_type,
/*
* Read or write the exact contents of a file,
* along with a buffer, (if applicable) offset,
* and number of bytes to be read. It unified
* and number of bytes to be read. It unifies
* the functionality of read(), pread(), write()
* and pwrite(), with retry-on-EINTR and also
* prevents infinite loop on zero-reads.
@@ -1559,20 +1559,20 @@ gbe_x_offset(size_t p, const char *f_op, const char *d_type,
* means that EOF is also considered fatal.
*/
static ssize_t
rw_file_exact(int fd, uint8_t *mem, size_t len,
rw_file_exact(int fd, uint8_t *mem, size_t nrw,
off_t off, int rw_type)
{
ssize_t rv;
size_t rc;
if (fd < 0 || !len || len > (size_t)SSIZE_MAX
if (fd < 0 || !nrw || nrw > (size_t)SSIZE_MAX
|| (unsigned int)rw_type > IO_PWRITE) {
errno = EIO;
return -1;
}
for (rc = 0, rv = 0; rc < len; ) {
if ((rv = rw_file_once(fd, mem, len, off, rw_type, rc)) <= 0)
for (rc = 0, rv = 0; rc < nrw; ) {
if ((rv = rw_file_once(fd, mem, nrw, off, rw_type, rc)) <= 0)
return -1;
rc += (size_t)rv;
@@ -1586,19 +1586,19 @@ rw_file_exact(int fd, uint8_t *mem, size_t len,
* Use rw_file_exact for guaranteed length.
*/
static ssize_t
rw_file_once(int fd, uint8_t *mem, size_t len,
rw_file_once(int fd, uint8_t *mem, size_t nrw,
off_t off, int rw_type, size_t rc)
{
ssize_t rv;
size_t retries_on_zero = 0;
size_t max_retries = 10;
if (fd < 0 || !len || len > (size_t)SSIZE_MAX
if (fd < 0 || !nrw || nrw > (size_t)SSIZE_MAX
|| (unsigned int)rw_type > IO_PWRITE)
goto err_rw_file_once;
read_again:
rv = do_rw(fd, mem + rc, len - rc, off + rc, rw_type);
rv = do_rw(fd, mem + rc, nrw - rc, off + rc, rw_type);
if (rv < 0 && errno == EINTR)
goto read_again;
@@ -1607,7 +1607,7 @@ read_again:
return -1;
if ((size_t)rv > SSIZE_MAX /* theoretical buggy libc */
|| (size_t)rv > (len - rc))/* don't overflow */
|| (size_t)rv > (nrw - rc))/* don't overflow */
goto err_rw_file_once;
if (rv != 0)
@@ -1623,16 +1623,16 @@ err_rw_file_once:
static ssize_t
do_rw(int fd, uint8_t *mem,
size_t len, off_t off, int rw_type)
size_t nrw, off_t off, int rw_type)
{
if (rw_type == IO_READ)
return read(fd, mem, len);
return read(fd, mem, nrw);
if (rw_type == IO_WRITE)
return write(fd, mem, len);
return write(fd, mem, nrw);
if (rw_type == IO_PREAD || rw_type == IO_PWRITE)
return prw(fd, mem, len, off, rw_type);
return prw(fd, mem, nrw, off, rw_type);
errno = EIO;
return -1;