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util/nvmutil: portable memcpy/memcmp

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Signed-off-by: Leah Rowe <leah@libreboot.org>
This commit is contained in:
Leah Rowe
2026-03-16 16:27:56 +00:00
parent 612783bc24
commit 5927c175df
1 changed files with 44 additions and 12 deletions
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util/nvmutil/nvmutil.c
+44 -12
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@@ -479,6 +479,10 @@ static char *x_c_strrchr(const char *s, int c);
static int x_i_rename(const char *src, const char *dst); static int x_i_rename(const char *src, const char *dst);
static char *x_c_tmpdir(void); static char *x_c_tmpdir(void);
static int x_i_close(int fd); static int x_i_close(int fd);
static void *x_v_memcpy(void *dst,
const void *src, unsigned long n);
static int x_i_memcmp(const void *a,
const void *b, unsigned long n);
/* /*
* Sizes in bytes: * Sizes in bytes:
@@ -1119,7 +1123,7 @@ copy_gbe(void)
if (r < 0) if (r < 0)
err(errno, "%s: read failed (cmp)", tname); err(errno, "%s: read failed (cmp)", tname);
if (memcmp(buf, bufcmp, gbe_file_size) != 0) if (x_i_memcmp(buf, bufcmp, gbe_file_size) != 0)
err(errno, "%s: %s: read contents differ (pre-test)", err(errno, "%s: %s: read contents differ (pre-test)",
fname, tname); fname, tname);
@@ -1136,7 +1140,7 @@ copy_gbe(void)
if (gbe_file_size == SIZE_8KB) if (gbe_file_size == SIZE_8KB)
return; return;
memcpy(buf + (unsigned long)GBE_PART_SIZE, x_v_memcpy(buf + (unsigned long)GBE_PART_SIZE,
buf + (unsigned long)(gbe_file_size >> 1), buf + (unsigned long)(gbe_file_size >> 1),
(unsigned long)GBE_PART_SIZE); (unsigned long)GBE_PART_SIZE);
} }
@@ -1558,17 +1562,17 @@ hexdump(unsigned long partnum)
static void static void
cmd_helper_swap(void) cmd_helper_swap(void)
{ {
memcpy( x_v_memcpy(
buf + (unsigned long)GBE_WORK_SIZE, buf + (unsigned long)GBE_WORK_SIZE,
buf, buf,
GBE_PART_SIZE); GBE_PART_SIZE);
memcpy( x_v_memcpy(
buf, buf,
buf + (unsigned long)GBE_PART_SIZE, buf + (unsigned long)GBE_PART_SIZE,
GBE_PART_SIZE); GBE_PART_SIZE);
memcpy( x_v_memcpy(
buf + (unsigned long)GBE_PART_SIZE, buf + (unsigned long)GBE_PART_SIZE,
buf + (unsigned long)GBE_WORK_SIZE, buf + (unsigned long)GBE_WORK_SIZE,
GBE_PART_SIZE); GBE_PART_SIZE);
@@ -1580,7 +1584,7 @@ cmd_helper_swap(void)
static void static void
cmd_helper_copy(void) cmd_helper_copy(void)
{ {
memcpy( x_v_memcpy(
buf + (unsigned long)((part ^ 1) * GBE_PART_SIZE), buf + (unsigned long)((part ^ 1) * GBE_PART_SIZE),
buf + (unsigned long)(part * GBE_PART_SIZE), buf + (unsigned long)(part * GBE_PART_SIZE),
GBE_PART_SIZE); GBE_PART_SIZE);
@@ -1904,7 +1908,7 @@ check_written_part(unsigned long p)
rw_check_err_read[p] = io_err_gbe = 1; rw_check_err_read[p] = io_err_gbe = 1;
else if ((unsigned long)r != gbe_rw_size) else if ((unsigned long)r != gbe_rw_size)
rw_check_partial_read[p] = io_err_gbe = 1; rw_check_partial_read[p] = io_err_gbe = 1;
else if (memcmp(mem_offset, pad, gbe_rw_size) != 0) else if (x_i_memcmp(mem_offset, pad, gbe_rw_size) != 0)
rw_check_bad_part[p] = io_err_gbe = 1; rw_check_bad_part[p] = io_err_gbe = 1;
if (rw_check_err_read[p] || if (rw_check_err_read[p] ||
@@ -2125,7 +2129,7 @@ fsync_dir(const char *path)
if (dirbuf == NULL) if (dirbuf == NULL)
goto err_fsync_dir; goto err_fsync_dir;
memcpy(dirbuf, path, pathlen + 1); x_v_memcpy(dirbuf, path, pathlen + 1);
slash = x_c_strrchr(dirbuf, '/'); slash = x_c_strrchr(dirbuf, '/');
if (slash != NULL) { if (slash != NULL) {
@@ -2922,17 +2926,17 @@ new_tmpfile(int *fd, int local, const char *path)
*dest = '.'; /* hidden file */ *dest = '.'; /* hidden file */
memcpy(dest + (unsigned long)1, tmpname, tmpname_len); x_v_memcpy(dest + (unsigned long)1, tmpname, tmpname_len);
memcpy(dest + (unsigned long)1 + tmpname_len, x_v_memcpy(dest + (unsigned long)1 + tmpname_len,
default_tmpname, tmpdir_len); default_tmpname, tmpdir_len);
} else { } else {
memcpy(dest, base, tmpdir_len); x_v_memcpy(dest, base, tmpdir_len);
dest[tmpdir_len] = '/'; dest[tmpdir_len] = '/';
memcpy(dest + tmpdir_len + 1, tmpname, tmpname_len); x_v_memcpy(dest + tmpdir_len + 1, tmpname, tmpname_len);
} }
dest[tmppath_len] = '\0'; dest[tmppath_len] = '\0';
@@ -3117,3 +3121,31 @@ x_i_close(int fd)
return r; return r;
} }
static void *
x_v_memcpy(void *dst, const void *src, unsigned long n)
{
unsigned char *d = (unsigned char *)dst;
const unsigned char *s = (const unsigned char *)src;
while (n--)
*d++ = *s++;
return dst;
}
static int
x_i_memcmp(const void *a, const void *b, unsigned long n)
{
const unsigned char *pa = (const unsigned char *)a;
const unsigned char *pb = (const unsigned char *)b;
while (n--) {
if (*pa != *pb)
return *pa - *pb;
pa++;
pb++;
}
return 0;
}