return name ? name : "";
}
-/* Sets the formatted value of 'format' as the name of the currently running
- * thread or process. (This appears in log messages and may also be visible in
- * system process listings and debuggers.) */
+/* Sets 'subprogram_name' as the name of the currently running thread or
+ * process. (This appears in log messages and may also be visible in system
+ * process listings and debuggers.) */
void
-set_subprogram_name(const char *format, ...)
+set_subprogram_name(const char *subprogram_name)
{
- char *pname;
-
- if (format) {
- va_list args;
-
- va_start(args, format);
- pname = xvasprintf(format, args);
- va_end(args);
- } else {
- pname = xstrdup(program_name);
- }
-
+ char *pname = xstrdup(subprogram_name ? subprogram_name : program_name);
free(subprogram_name_set(pname));
#if HAVE_GLIBC_PTHREAD_SETNAME_NP
long long ll;
bool ok = str_to_llong(s, base, &ll);
if (!ok || ll < 0 || ll > UINT_MAX) {
- *u = 0;
- return false;
+ *u = 0;
+ return false;
} else {
- *u = ll;
- return true;
+ *u = ll;
+ return true;
}
}
free:
free(hexit_str);
- return err;
+ return err;
}
errno = 0;
return true;
}
-/* Scans the bits in 'p' that have bit offsets 'start' through 'end'
- * (inclusive) for the first bit with value 'target'. If one is found, returns
- * its offset, otherwise 'end'. 'p' is 'len' bytes long.
+/* Scans the bits in 'p' that have bit offsets 'start' (inclusive) through
+ * 'end' (exclusive) for the first bit with value 'target'. If one is found,
+ * returns its offset, otherwise 'end'. 'p' is 'len' bytes long.
*
* If you consider all of 'p' to be a single unsigned integer in network byte
* order, then bit N is the bit with value 2**N. That is, bit 0 is the bit
* start <= end
*/
unsigned int
-bitwise_scan(const void *p_, unsigned int len, bool target, unsigned int start,
+bitwise_scan(const void *p, unsigned int len, bool target, unsigned int start,
unsigned int end)
{
- const uint8_t *p = p_;
unsigned int ofs;
for (ofs = start; ofs < end; ofs++) {
- bool bit = (p[len - (ofs / 8 + 1)] & (1u << (ofs % 8))) != 0;
- if (bit == target) {
+ if (bitwise_get_bit(p, len, ofs) == target) {
break;
}
}
return ofs;
}
+/* Scans the bits in 'p' that have bit offsets 'start' (inclusive) through
+ * 'end' (exclusive) for the first bit with value 'target', in reverse order.
+ * If one is found, returns its offset, otherwise 'end'. 'p' is 'len' bytes
+ * long.
+ *
+ * If you consider all of 'p' to be a single unsigned integer in network byte
+ * order, then bit N is the bit with value 2**N. That is, bit 0 is the bit
+ * with value 1 in p[len - 1], bit 1 is the bit with value 2, bit 2 is the bit
+ * with value 4, ..., bit 8 is the bit with value 1 in p[len - 2], and so on.
+ *
+ * To scan an entire bit array in reverse order, specify start == len * 8 - 1
+ * and end == -1, in which case the return value is nonnegative if successful
+ * and -1 if no 'target' match is found.
+ *
+ * Required invariant:
+ * start >= end
+ */
+int
+bitwise_rscan(const void *p, unsigned int len, bool target, int start, int end)
+{
+ int ofs;
+
+ for (ofs = start; ofs > end; ofs--) {
+ if (bitwise_get_bit(p, len, ofs) == target) {
+ break;
+ }
+ }
+ return ofs;
+}
/* Copies the 'n_bits' low-order bits of 'value' into the 'n_bits' bits
* starting at bit 'dst_ofs' in 'dst', which is 'dst_len' bytes long.
n_bits);
return ntohll(value);
}
+
+/* Returns the value of the bit with offset 'ofs' in 'src', which is 'len'
+ * bytes long.
+ *
+ * If you consider all of 'src' to be a single unsigned integer in network byte
+ * order, then bit N is the bit with value 2**N. That is, bit 0 is the bit
+ * with value 1 in src[len - 1], bit 1 is the bit with value 2, bit 2 is the
+ * bit with value 4, ..., bit 8 is the bit with value 1 in src[len - 2], and so
+ * on.
+ *
+ * Required invariants:
+ * ofs < len * 8
+ */
+bool
+bitwise_get_bit(const void *src_, unsigned int len, unsigned int ofs)
+{
+ const uint8_t *src = src_;
+
+ return (src[len - (ofs / 8 + 1)] & (1u << (ofs % 8))) != 0;
+}
+
+/* Sets the bit with offset 'ofs' in 'dst', which is 'len' bytes long, to 0.
+ *
+ * If you consider all of 'dst' to be a single unsigned integer in network byte
+ * order, then bit N is the bit with value 2**N. That is, bit 0 is the bit
+ * with value 1 in dst[len - 1], bit 1 is the bit with value 2, bit 2 is the
+ * bit with value 4, ..., bit 8 is the bit with value 1 in dst[len - 2], and so
+ * on.
+ *
+ * Required invariants:
+ * ofs < len * 8
+ */
+void
+bitwise_put0(void *dst_, unsigned int len, unsigned int ofs)
+{
+ uint8_t *dst = dst_;
+
+ dst[len - (ofs / 8 + 1)] &= ~(1u << (ofs % 8));
+}
+
+/* Sets the bit with offset 'ofs' in 'dst', which is 'len' bytes long, to 1.
+ *
+ * If you consider all of 'dst' to be a single unsigned integer in network byte
+ * order, then bit N is the bit with value 2**N. That is, bit 0 is the bit
+ * with value 1 in dst[len - 1], bit 1 is the bit with value 2, bit 2 is the
+ * bit with value 4, ..., bit 8 is the bit with value 1 in dst[len - 2], and so
+ * on.
+ *
+ * Required invariants:
+ * ofs < len * 8
+ */
+void
+bitwise_put1(void *dst_, unsigned int len, unsigned int ofs)
+{
+ uint8_t *dst = dst_;
+
+ dst[len - (ofs / 8 + 1)] |= 1u << (ofs % 8);
+}
+
+/* Sets the bit with offset 'ofs' in 'dst', which is 'len' bytes long, to 'b'.
+ *
+ * If you consider all of 'dst' to be a single unsigned integer in network byte
+ * order, then bit N is the bit with value 2**N. That is, bit 0 is the bit
+ * with value 1 in dst[len - 1], bit 1 is the bit with value 2, bit 2 is the
+ * bit with value 4, ..., bit 8 is the bit with value 1 in dst[len - 2], and so
+ * on.
+ *
+ * Required invariants:
+ * ofs < len * 8
+ */
+void
+bitwise_put_bit(void *dst, unsigned int len, unsigned int ofs, bool b)
+{
+ if (b) {
+ bitwise_put1(dst, len, ofs);
+ } else {
+ bitwise_put0(dst, len, ofs);
+ }
+}
+
+/* Flips the bit with offset 'ofs' in 'dst', which is 'len' bytes long.
+ *
+ * If you consider all of 'dst' to be a single unsigned integer in network byte
+ * order, then bit N is the bit with value 2**N. That is, bit 0 is the bit
+ * with value 1 in dst[len - 1], bit 1 is the bit with value 2, bit 2 is the
+ * bit with value 4, ..., bit 8 is the bit with value 1 in dst[len - 2], and so
+ * on.
+ *
+ * Required invariants:
+ * ofs < len * 8
+ */
+void
+bitwise_toggle_bit(void *dst_, unsigned int len, unsigned int ofs)
+{
+ uint8_t *dst = dst_;
+
+ dst[len - (ofs / 8 + 1)] ^= 1u << (ofs % 8);
+}
\f
/* ovs_scan */
projects / cascardo / ovs.git / blobdiff