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util: New function is_all_byte().

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This makes it easy for callers to choose all-ones or all-zeros based on
a parameter instead of choice of function.

Signed-off-by: Ben Pfaff <blp@ovn.org>
Acked-by: Andy Zhou <azhou@ovn.org>
This commit is contained in:
Ben Pfaff
2017-07-31 10:07:50 -07:00
parent a4e8ed0c7f
commit df1a62cbd0
2 changed files with 13 additions and 13 deletions
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25
lib/util.c
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@@ -1230,34 +1230,33 @@ const uint8_t count_1bits_8[256] = {
};
#endif
/* Returns true if the 'n' bytes starting at 'p' are zeros. */
/* Returns true if the 'n' bytes starting at 'p' are 'byte'. */
bool
is_all_zeros(const void *p_, size_t n)
is_all_byte(const void *p_, size_t n, uint8_t byte)
{
const uint8_t *p = p_;
size_t i;
for (i = 0; i < n; i++) {
if (p[i] != 0x00) {
if (p[i] != byte) {
return false;
}
}
return true;
}
/* Returns true if the 'n' bytes starting at 'p' are zeros. */
bool
is_all_zeros(const void *p, size_t n)
{
return is_all_byte(p, n, 0);
}
/* Returns true if the 'n' bytes starting at 'p' are 0xff. */
bool
is_all_ones(const void *p_, size_t n)
is_all_ones(const void *p, size_t n)
{
const uint8_t *p = p_;
size_t i;
for (i = 0; i < n; i++) {
if (p[i] != 0xff) {
return false;
}
}
return true;
return is_all_byte(p, n, 0xff);
}
/* Copies 'n_bits' bits starting from bit 'src_ofs' in 'src' to the 'n_bits'