2 * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014 Nicira, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
31 #include "byte-order.h"
34 #include "ovs-thread.h"
36 #ifdef HAVE_PTHREAD_SET_NAME_NP
37 #include <pthread_np.h>
40 VLOG_DEFINE_THIS_MODULE(util);
42 COVERAGE_DEFINE(util_xalloc);
44 /* argv[0] without directory names. */
45 const char *program_name;
47 /* Name for the currently running thread or process, for log messages, process
48 * listings, and debuggers. */
49 DEFINE_PER_THREAD_MALLOCED_DATA(char *, subprogram_name);
51 /* --version option output. */
52 static char *program_version;
54 /* Buffer used by ovs_strerror() and ovs_format_message(). */
55 DEFINE_STATIC_PER_THREAD_DATA(struct { char s[128]; },
59 static char *xreadlink(const char *filename);
62 ovs_assert_failure(const char *where, const char *function,
63 const char *condition)
65 /* Prevent an infinite loop (or stack overflow) in case VLOG_ABORT happens
66 * to trigger an assertion failure of its own. */
67 static int reentry = 0;
71 VLOG_ABORT("%s: assertion %s failed in %s()",
72 where, condition, function);
76 fprintf(stderr, "%s: assertion %s failed in %s()",
77 where, condition, function);
88 ovs_abort(0, "virtual memory exhausted");
92 xcalloc(size_t count, size_t size)
94 void *p = count && size ? calloc(count, size) : malloc(1);
95 COVERAGE_INC(util_xalloc);
105 return xcalloc(1, size);
111 void *p = malloc(size ? size : 1);
112 COVERAGE_INC(util_xalloc);
120 xrealloc(void *p, size_t size)
122 p = realloc(p, size ? size : 1);
123 COVERAGE_INC(util_xalloc);
131 xmemdup(const void *p_, size_t size)
133 void *p = xmalloc(size);
139 xmemdup0(const char *p_, size_t length)
141 char *p = xmalloc(length + 1);
142 memcpy(p, p_, length);
148 xstrdup(const char *s)
150 return xmemdup0(s, strlen(s));
154 xvasprintf(const char *format, va_list args)
160 va_copy(args2, args);
161 needed = vsnprintf(NULL, 0, format, args);
163 s = xmalloc(needed + 1);
165 vsnprintf(s, needed + 1, format, args2);
172 x2nrealloc(void *p, size_t *n, size_t s)
174 *n = *n == 0 ? 1 : 2 * *n;
175 return xrealloc(p, *n * s);
178 /* The desired minimum alignment for an allocated block of memory. */
179 #define MEM_ALIGN MAX(sizeof(void *), 8)
180 BUILD_ASSERT_DECL(IS_POW2(MEM_ALIGN));
181 BUILD_ASSERT_DECL(CACHE_LINE_SIZE >= MEM_ALIGN);
183 /* Allocates and returns 'size' bytes of memory in dedicated cache lines. That
184 * is, the memory block returned will not share a cache line with other data,
185 * avoiding "false sharing". (The memory returned will not be at the start of
186 * a cache line, though, so don't assume such alignment.)
188 * Use free_cacheline() to free the returned memory block. */
190 xmalloc_cacheline(size_t size)
192 #ifdef HAVE_POSIX_MEMALIGN
196 COVERAGE_INC(util_xalloc);
197 error = posix_memalign(&p, CACHE_LINE_SIZE, size ? size : 1);
206 /* Allocate room for:
208 * - Up to CACHE_LINE_SIZE - 1 bytes before the payload, so that the
209 * start of the payload doesn't potentially share a cache line.
211 * - A payload consisting of a void *, followed by padding out to
212 * MEM_ALIGN bytes, followed by 'size' bytes of user data.
214 * - Space following the payload up to the end of the cache line, so
215 * that the end of the payload doesn't potentially share a cache line
216 * with some following block. */
217 base = xmalloc((CACHE_LINE_SIZE - 1)
218 + ROUND_UP(MEM_ALIGN + size, CACHE_LINE_SIZE));
220 /* Locate the payload and store a pointer to the base at the beginning. */
221 payload = (void **) ROUND_UP((uintptr_t) base, CACHE_LINE_SIZE);
224 return (char *) payload + MEM_ALIGN;
228 /* Like xmalloc_cacheline() but clears the allocated memory to all zero
231 xzalloc_cacheline(size_t size)
233 void *p = xmalloc_cacheline(size);
238 /* Frees a memory block allocated with xmalloc_cacheline() or
239 * xzalloc_cacheline(). */
241 free_cacheline(void *p)
243 #ifdef HAVE_POSIX_MEMALIGN
247 free(*(void **) ((uintptr_t) p - MEM_ALIGN));
253 xasprintf(const char *format, ...)
258 va_start(args, format);
259 s = xvasprintf(format, args);
265 /* Similar to strlcpy() from OpenBSD, but it never reads more than 'size - 1'
266 * bytes from 'src' and doesn't return anything. */
268 ovs_strlcpy(char *dst, const char *src, size_t size)
271 size_t len = strnlen(src, size - 1);
272 memcpy(dst, src, len);
277 /* Copies 'src' to 'dst'. Reads no more than 'size - 1' bytes from 'src'.
278 * Always null-terminates 'dst' (if 'size' is nonzero), and writes a zero byte
279 * to every otherwise unused byte in 'dst'.
281 * Except for performance, the following call:
282 * ovs_strzcpy(dst, src, size);
283 * is equivalent to these two calls:
284 * memset(dst, '\0', size);
285 * ovs_strlcpy(dst, src, size);
287 * (Thus, ovs_strzcpy() is similar to strncpy() without some of the pitfalls.)
290 ovs_strzcpy(char *dst, const char *src, size_t size)
293 size_t len = strnlen(src, size - 1);
294 memcpy(dst, src, len);
295 memset(dst + len, '\0', size - len);
299 /* Prints 'format' on stderr, formatting it like printf() does. If 'err_no' is
300 * nonzero, then it is formatted with ovs_retval_to_string() and appended to
301 * the message inside parentheses. Then, terminates with abort().
303 * This function is preferred to ovs_fatal() in a situation where it would make
304 * sense for a monitoring process to restart the daemon.
306 * 'format' should not end with a new-line, because this function will add one
309 ovs_abort(int err_no, const char *format, ...)
313 va_start(args, format);
314 ovs_abort_valist(err_no, format, args);
317 /* Same as ovs_abort() except that the arguments are supplied as a va_list. */
319 ovs_abort_valist(int err_no, const char *format, va_list args)
321 ovs_error_valist(err_no, format, args);
325 /* Prints 'format' on stderr, formatting it like printf() does. If 'err_no' is
326 * nonzero, then it is formatted with ovs_retval_to_string() and appended to
327 * the message inside parentheses. Then, terminates with EXIT_FAILURE.
329 * 'format' should not end with a new-line, because this function will add one
332 ovs_fatal(int err_no, const char *format, ...)
336 va_start(args, format);
337 ovs_fatal_valist(err_no, format, args);
340 /* Same as ovs_fatal() except that the arguments are supplied as a va_list. */
342 ovs_fatal_valist(int err_no, const char *format, va_list args)
344 ovs_error_valist(err_no, format, args);
348 /* Prints 'format' on stderr, formatting it like printf() does. If 'err_no' is
349 * nonzero, then it is formatted with ovs_retval_to_string() and appended to
350 * the message inside parentheses.
352 * 'format' should not end with a new-line, because this function will add one
355 ovs_error(int err_no, const char *format, ...)
359 va_start(args, format);
360 ovs_error_valist(err_no, format, args);
364 /* Same as ovs_error() except that the arguments are supplied as a va_list. */
366 ovs_error_valist(int err_no, const char *format, va_list args)
368 const char *subprogram_name = get_subprogram_name();
369 int save_errno = errno;
371 if (subprogram_name[0]) {
372 fprintf(stderr, "%s(%s): ", program_name, subprogram_name);
374 fprintf(stderr, "%s: ", program_name);
377 vfprintf(stderr, format, args);
379 fprintf(stderr, " (%s)", ovs_retval_to_string(err_no));
386 /* Many OVS functions return an int which is one of:
389 * - EOF: end of file (not necessarily an error; depends on the function called)
391 * Returns the appropriate human-readable string. The caller must copy the
392 * string if it wants to hold onto it, as the storage may be overwritten on
393 * subsequent function calls.
396 ovs_retval_to_string(int retval)
399 : retval == EOF ? "End of file"
400 : ovs_strerror(retval));
403 /* This function returns the string describing the error number in 'error'
404 * for POSIX platforms. For Windows, this function can be used for C library
405 * calls. For socket calls that are also used in Windows, use sock_strerror()
406 * instead. For WINAPI calls, look at ovs_lasterror_to_string(). */
408 ovs_strerror(int error)
410 enum { BUFSIZE = sizeof strerror_buffer_get()->s };
416 buffer = strerror_buffer_get()->s;
418 #if STRERROR_R_CHAR_P
419 /* GNU style strerror_r() might return an immutable static string, or it
420 * might write and return 'buffer', but in either case we can pass the
421 * returned string directly to the caller. */
422 s = strerror_r(error, buffer, BUFSIZE);
423 #else /* strerror_r() returns an int. */
425 if (strerror_r(error, buffer, BUFSIZE)) {
426 /* strerror_r() is only allowed to fail on ERANGE (because the buffer
427 * is too short). We don't check the actual failure reason because
428 * POSIX requires strerror_r() to return the error but old glibc
429 * (before 2.13) returns -1 and sets errno. */
430 snprintf(buffer, BUFSIZE, "Unknown error %d", error);
439 /* Sets global "program_name" and "program_version" variables. Should
440 * be called at the beginning of main() with "argv[0]" as the argument
443 * 'version' should contain the version of the caller's program. If 'version'
444 * is the same as the VERSION #define, the caller is assumed to be part of Open
445 * vSwitch. Otherwise, it is assumed to be an external program linking against
446 * the Open vSwitch libraries.
448 * The 'date' and 'time' arguments should likely be called with
449 * "__DATE__" and "__TIME__" to use the time the binary was built.
450 * Alternatively, the "set_program_name" macro may be called to do this
454 set_program_name__(const char *argv0, const char *version, const char *date,
461 size_t max_len = strlen(argv0) + 1;
463 SetErrorMode(GetErrorMode() | SEM_NOGPFAULTERRORBOX);
465 basename = xmalloc(max_len);
466 _splitpath_s(argv0, NULL, 0, NULL, 0, basename, max_len, NULL, 0);
467 assert_single_threaded();
468 program_name = basename;
470 const char *slash = strrchr(argv0, '/');
471 assert_single_threaded();
472 program_name = xstrdup(slash ? slash + 1 : argv0);
475 free(program_version);
477 if (!strcmp(version, VERSION)) {
478 program_version = xasprintf("%s (Open vSwitch) "VERSION"\n"
480 program_name, date, time);
482 program_version = xasprintf("%s %s\n"
483 "Open vSwitch Library "VERSION"\n"
485 program_name, version, date, time);
489 /* Returns the name of the currently running thread or process. */
491 get_subprogram_name(void)
493 const char *name = subprogram_name_get();
494 return name ? name : "";
497 /* Sets the formatted value of 'format' as the name of the currently running
498 * thread or process. (This appears in log messages and may also be visible in
499 * system process listings and debuggers.) */
501 set_subprogram_name(const char *format, ...)
508 va_start(args, format);
509 pname = xvasprintf(format, args);
512 pname = xstrdup(program_name);
515 free(subprogram_name_set(pname));
517 #if HAVE_GLIBC_PTHREAD_SETNAME_NP
518 pthread_setname_np(pthread_self(), pname);
519 #elif HAVE_NETBSD_PTHREAD_SETNAME_NP
520 pthread_setname_np(pthread_self(), "%s", pname);
521 #elif HAVE_PTHREAD_SET_NAME_NP
522 pthread_set_name_np(pthread_self(), pname);
526 /* Returns a pointer to a string describing the program version. The
527 * caller must not modify or free the returned string.
530 get_program_version(void)
532 return program_version;
535 /* Print the version information for the program. */
537 ovs_print_version(uint8_t min_ofp, uint8_t max_ofp)
539 printf("%s", program_version);
540 if (min_ofp || max_ofp) {
541 printf("OpenFlow versions %#x:%#x\n", min_ofp, max_ofp);
545 /* Writes the 'size' bytes in 'buf' to 'stream' as hex bytes arranged 16 per
546 * line. Numeric offsets are also included, starting at 'ofs' for the first
547 * byte in 'buf'. If 'ascii' is true then the corresponding ASCII characters
548 * are also rendered alongside. */
550 ovs_hex_dump(FILE *stream, const void *buf_, size_t size,
551 uintptr_t ofs, bool ascii)
553 const uint8_t *buf = buf_;
554 const size_t per_line = 16; /* Maximum bytes per line. */
558 size_t start, end, n;
561 /* Number of bytes on this line. */
562 start = ofs % per_line;
564 if (end - start > size)
569 fprintf(stream, "%08"PRIxMAX" ", (uintmax_t) ROUND_DOWN(ofs, per_line));
570 for (i = 0; i < start; i++)
571 fprintf(stream, " ");
573 fprintf(stream, "%02x%c",
574 buf[i - start], i == per_line / 2 - 1? '-' : ' ');
577 for (; i < per_line; i++)
578 fprintf(stream, " ");
579 fprintf(stream, "|");
580 for (i = 0; i < start; i++)
581 fprintf(stream, " ");
582 for (; i < end; i++) {
583 int c = buf[i - start];
584 putc(c >= 32 && c < 127 ? c : '.', stream);
586 for (; i < per_line; i++)
587 fprintf(stream, " ");
588 fprintf(stream, "|");
590 fprintf(stream, "\n");
599 str_to_int(const char *s, int base, int *i)
602 bool ok = str_to_llong(s, base, &ll);
608 str_to_long(const char *s, int base, long *li)
611 bool ok = str_to_llong(s, base, &ll);
617 str_to_llong(const char *s, int base, long long *x)
619 int save_errno = errno;
622 *x = strtoll(s, &tail, base);
623 if (errno == EINVAL || errno == ERANGE || tail == s || *tail != '\0') {
634 str_to_uint(const char *s, int base, unsigned int *u)
637 bool ok = str_to_llong(s, base, &ll);
638 if (!ok || ll < 0 || ll > UINT_MAX) {
647 /* Converts floating-point string 's' into a double. If successful, stores
648 * the double in '*d' and returns true; on failure, stores 0 in '*d' and
651 * Underflow (e.g. "1e-9999") is not considered an error, but overflow
652 * (e.g. "1e9999)" is. */
654 str_to_double(const char *s, double *d)
656 int save_errno = errno;
659 *d = strtod(s, &tail);
660 if (errno == EINVAL || (errno == ERANGE && *d != 0)
661 || tail == s || *tail != '\0') {
671 /* Returns the value of 'c' as a hexadecimal digit. */
676 case '0': case '1': case '2': case '3': case '4':
677 case '5': case '6': case '7': case '8': case '9':
703 /* Returns the integer value of the 'n' hexadecimal digits starting at 's', or
704 * UINT_MAX if one of those "digits" is not really a hex digit. If 'ok' is
705 * nonnull, '*ok' is set to true if the conversion succeeds or to false if a
706 * non-hex digit is detected. */
708 hexits_value(const char *s, size_t n, bool *ok)
714 for (i = 0; i < n; i++) {
715 int hexit = hexit_value(s[i]);
722 value = (value << 4) + hexit;
730 /* Returns the current working directory as a malloc()'d string, or a null
731 * pointer if the current working directory cannot be determined. */
738 /* Get maximum path length or at least a reasonable estimate. */
740 path_max = pathconf(".", _PC_PATH_MAX);
744 size = (path_max < 0 ? 1024
745 : path_max > 10240 ? 10240
748 /* Get current working directory. */
750 char *buf = xmalloc(size);
751 if (getcwd(buf, size)) {
752 return xrealloc(buf, strlen(buf) + 1);
756 if (error != ERANGE) {
757 VLOG_WARN("getcwd failed (%s)", ovs_strerror(error));
766 all_slashes_name(const char *s)
768 return xstrdup(s[0] == '/' && s[1] == '/' && s[2] != '/' ? "//"
773 /* Returns the directory name portion of 'file_name' as a malloc()'d string,
774 * similar to the POSIX dirname() function but thread-safe. */
776 dir_name(const char *file_name)
778 size_t len = strlen(file_name);
779 while (len > 0 && file_name[len - 1] == '/') {
782 while (len > 0 && file_name[len - 1] != '/') {
785 while (len > 0 && file_name[len - 1] == '/') {
788 return len ? xmemdup0(file_name, len) : all_slashes_name(file_name);
791 /* Returns the file name portion of 'file_name' as a malloc()'d string,
792 * similar to the POSIX basename() function but thread-safe. */
794 base_name(const char *file_name)
798 end = strlen(file_name);
799 while (end > 0 && file_name[end - 1] == '/') {
804 return all_slashes_name(file_name);
808 while (start > 0 && file_name[start - 1] != '/') {
812 return xmemdup0(file_name + start, end - start);
815 /* If 'file_name' starts with '/', returns a copy of 'file_name'. Otherwise,
816 * returns an absolute path to 'file_name' considering it relative to 'dir',
817 * which itself must be absolute. 'dir' may be null or the empty string, in
818 * which case the current working directory is used.
820 * Returns a null pointer if 'dir' is null and getcwd() fails. */
822 abs_file_name(const char *dir, const char *file_name)
824 if (file_name[0] == '/') {
825 return xstrdup(file_name);
826 } else if (dir && dir[0]) {
827 char *separator = dir[strlen(dir) - 1] == '/' ? "" : "/";
828 return xasprintf("%s%s%s", dir, separator, file_name);
830 char *cwd = get_cwd();
832 char *abs_name = xasprintf("%s/%s", cwd, file_name);
841 /* Like readlink(), but returns the link name as a null-terminated string in
842 * allocated memory that the caller must eventually free (with free()).
843 * Returns NULL on error, in which case errno is set appropriately. */
845 xreadlink(const char *filename)
849 for (size = 64; ; size *= 2) {
850 char *buf = xmalloc(size);
851 ssize_t retval = readlink(filename, buf, size);
854 if (retval >= 0 && retval < size) {
867 /* Returns a version of 'filename' with symlinks in the final component
868 * dereferenced. This differs from realpath() in that:
870 * - 'filename' need not exist.
872 * - If 'filename' does exist as a symlink, its referent need not exist.
874 * - Only symlinks in the final component of 'filename' are dereferenced.
876 * For Windows platform, this function returns a string that has the same
877 * value as the passed string.
879 * The caller must eventually free the returned string (with free()). */
881 follow_symlinks(const char *filename)
888 fn = xstrdup(filename);
889 for (i = 0; i < 10; i++) {
893 if (lstat(fn, &s) != 0 || !S_ISLNK(s.st_mode)) {
897 linkname = xreadlink(fn);
899 VLOG_WARN("%s: readlink failed (%s)",
900 filename, ovs_strerror(errno));
904 if (linkname[0] == '/') {
905 /* Target of symlink is absolute so use it raw. */
908 /* Target of symlink is relative so add to 'fn''s directory. */
909 char *dir = dir_name(fn);
911 if (!strcmp(dir, ".")) {
914 char *separator = dir[strlen(dir) - 1] == '/' ? "" : "/";
915 next_fn = xasprintf("%s%s%s", dir, separator, linkname);
926 VLOG_WARN("%s: too many levels of symlinks", filename);
929 return xstrdup(filename);
932 /* Pass a value to this function if it is marked with
933 * __attribute__((warn_unused_result)) and you genuinely want to ignore
934 * its return value. (Note that every scalar type can be implicitly
935 * converted to bool.) */
936 void ignore(bool x OVS_UNUSED) { }
938 /* Returns an appropriate delimiter for inserting just before the 0-based item
939 * 'index' in a list that has 'total' items in it. */
941 english_list_delimiter(size_t index, size_t total)
943 return (index == 0 ? ""
944 : index < total - 1 ? ", "
945 : total > 2 ? ", and "
949 /* Returns the number of trailing 0-bits in 'n'. Undefined if 'n' == 0. */
951 /* Defined inline in util.h. */
953 /* Returns the number of trailing 0-bits in 'n'. Undefined if 'n' == 0. */
960 #define CTZ_STEP(X) \
977 /* Returns the number of leading 0-bits in 'n'. Undefined if 'n' == 0. */
979 raw_clz64(uint64_t n)
984 #define CLZ_STEP(X) \
1002 #if NEED_COUNT_1BITS_8
1004 ((((X) & (1 << 0)) != 0) + \
1005 (((X) & (1 << 1)) != 0) + \
1006 (((X) & (1 << 2)) != 0) + \
1007 (((X) & (1 << 3)) != 0) + \
1008 (((X) & (1 << 4)) != 0) + \
1009 (((X) & (1 << 5)) != 0) + \
1010 (((X) & (1 << 6)) != 0) + \
1011 (((X) & (1 << 7)) != 0))
1012 #define INIT2(X) INIT1(X), INIT1((X) + 1)
1013 #define INIT4(X) INIT2(X), INIT2((X) + 2)
1014 #define INIT8(X) INIT4(X), INIT4((X) + 4)
1015 #define INIT16(X) INIT8(X), INIT8((X) + 8)
1016 #define INIT32(X) INIT16(X), INIT16((X) + 16)
1017 #define INIT64(X) INIT32(X), INIT32((X) + 32)
1019 const uint8_t count_1bits_8[256] = {
1020 INIT64(0), INIT64(64), INIT64(128), INIT64(192)
1024 /* Returns true if the 'n' bytes starting at 'p' are zeros. */
1026 is_all_zeros(const uint8_t *p, size_t n)
1030 for (i = 0; i < n; i++) {
1038 /* Returns true if the 'n' bytes starting at 'p' are 0xff. */
1040 is_all_ones(const uint8_t *p, size_t n)
1044 for (i = 0; i < n; i++) {
1052 /* Copies 'n_bits' bits starting from bit 'src_ofs' in 'src' to the 'n_bits'
1053 * starting from bit 'dst_ofs' in 'dst'. 'src' is 'src_len' bytes long and
1054 * 'dst' is 'dst_len' bytes long.
1056 * If you consider all of 'src' to be a single unsigned integer in network byte
1057 * order, then bit N is the bit with value 2**N. That is, bit 0 is the bit
1058 * with value 1 in src[src_len - 1], bit 1 is the bit with value 2, bit 2 is
1059 * the bit with value 4, ..., bit 8 is the bit with value 1 in src[src_len -
1060 * 2], and so on. Similarly for 'dst'.
1062 * Required invariants:
1063 * src_ofs + n_bits <= src_len * 8
1064 * dst_ofs + n_bits <= dst_len * 8
1065 * 'src' and 'dst' must not overlap.
1068 bitwise_copy(const void *src_, unsigned int src_len, unsigned int src_ofs,
1069 void *dst_, unsigned int dst_len, unsigned int dst_ofs,
1070 unsigned int n_bits)
1072 const uint8_t *src = src_;
1073 uint8_t *dst = dst_;
1075 src += src_len - (src_ofs / 8 + 1);
1078 dst += dst_len - (dst_ofs / 8 + 1);
1081 if (src_ofs == 0 && dst_ofs == 0) {
1082 unsigned int n_bytes = n_bits / 8;
1086 memcpy(dst, src, n_bytes);
1093 uint8_t mask = (1 << n_bits) - 1;
1094 *dst = (*dst & ~mask) | (*src & mask);
1097 while (n_bits > 0) {
1098 unsigned int max_copy = 8 - MAX(src_ofs, dst_ofs);
1099 unsigned int chunk = MIN(n_bits, max_copy);
1100 uint8_t mask = ((1 << chunk) - 1) << dst_ofs;
1103 *dst |= ((*src >> src_ofs) << dst_ofs) & mask;
1120 /* Zeros the 'n_bits' bits starting from bit 'dst_ofs' in 'dst'. 'dst' is
1121 * 'dst_len' bytes long.
1123 * If you consider all of 'dst' to be a single unsigned integer in network byte
1124 * order, then bit N is the bit with value 2**N. That is, bit 0 is the bit
1125 * with value 1 in dst[dst_len - 1], bit 1 is the bit with value 2, bit 2 is
1126 * the bit with value 4, ..., bit 8 is the bit with value 1 in dst[dst_len -
1129 * Required invariant:
1130 * dst_ofs + n_bits <= dst_len * 8
1133 bitwise_zero(void *dst_, unsigned int dst_len, unsigned dst_ofs,
1134 unsigned int n_bits)
1136 uint8_t *dst = dst_;
1142 dst += dst_len - (dst_ofs / 8 + 1);
1146 unsigned int chunk = MIN(n_bits, 8 - dst_ofs);
1148 *dst &= ~(((1 << chunk) - 1) << dst_ofs);
1158 while (n_bits >= 8) {
1164 *dst &= ~((1 << n_bits) - 1);
1168 /* Sets to 1 all of the 'n_bits' bits starting from bit 'dst_ofs' in 'dst'.
1169 * 'dst' is 'dst_len' bytes long.
1171 * If you consider all of 'dst' to be a single unsigned integer in network byte
1172 * order, then bit N is the bit with value 2**N. That is, bit 0 is the bit
1173 * with value 1 in dst[dst_len - 1], bit 1 is the bit with value 2, bit 2 is
1174 * the bit with value 4, ..., bit 8 is the bit with value 1 in dst[dst_len -
1177 * Required invariant:
1178 * dst_ofs + n_bits <= dst_len * 8
1181 bitwise_one(void *dst_, unsigned int dst_len, unsigned dst_ofs,
1182 unsigned int n_bits)
1184 uint8_t *dst = dst_;
1190 dst += dst_len - (dst_ofs / 8 + 1);
1194 unsigned int chunk = MIN(n_bits, 8 - dst_ofs);
1196 *dst |= ((1 << chunk) - 1) << dst_ofs;
1206 while (n_bits >= 8) {
1212 *dst |= (1 << n_bits) - 1;
1216 /* Scans the 'n_bits' bits starting from bit 'dst_ofs' in 'dst' for 1-bits.
1217 * Returns false if any 1-bits are found, otherwise true. 'dst' is 'dst_len'
1220 * If you consider all of 'dst' to be a single unsigned integer in network byte
1221 * order, then bit N is the bit with value 2**N. That is, bit 0 is the bit
1222 * with value 1 in dst[dst_len - 1], bit 1 is the bit with value 2, bit 2 is
1223 * the bit with value 4, ..., bit 8 is the bit with value 1 in dst[dst_len -
1226 * Required invariant:
1227 * dst_ofs + n_bits <= dst_len * 8
1230 bitwise_is_all_zeros(const void *p_, unsigned int len, unsigned int ofs,
1231 unsigned int n_bits)
1233 const uint8_t *p = p_;
1239 p += len - (ofs / 8 + 1);
1243 unsigned int chunk = MIN(n_bits, 8 - ofs);
1245 if (*p & (((1 << chunk) - 1) << ofs)) {
1257 while (n_bits >= 8) {
1265 if (n_bits && *p & ((1 << n_bits) - 1)) {
1272 /* Copies the 'n_bits' low-order bits of 'value' into the 'n_bits' bits
1273 * starting at bit 'dst_ofs' in 'dst', which is 'dst_len' bytes long.
1275 * If you consider all of 'dst' to be a single unsigned integer in network byte
1276 * order, then bit N is the bit with value 2**N. That is, bit 0 is the bit
1277 * with value 1 in dst[dst_len - 1], bit 1 is the bit with value 2, bit 2 is
1278 * the bit with value 4, ..., bit 8 is the bit with value 1 in dst[dst_len -
1281 * Required invariants:
1282 * dst_ofs + n_bits <= dst_len * 8
1286 bitwise_put(uint64_t value,
1287 void *dst, unsigned int dst_len, unsigned int dst_ofs,
1288 unsigned int n_bits)
1290 ovs_be64 n_value = htonll(value);
1291 bitwise_copy(&n_value, sizeof n_value, 0,
1292 dst, dst_len, dst_ofs,
1296 /* Returns the value of the 'n_bits' bits starting at bit 'src_ofs' in 'src',
1297 * which is 'src_len' bytes long.
1299 * If you consider all of 'src' to be a single unsigned integer in network byte
1300 * order, then bit N is the bit with value 2**N. That is, bit 0 is the bit
1301 * with value 1 in src[src_len - 1], bit 1 is the bit with value 2, bit 2 is
1302 * the bit with value 4, ..., bit 8 is the bit with value 1 in src[src_len -
1305 * Required invariants:
1306 * src_ofs + n_bits <= src_len * 8
1310 bitwise_get(const void *src, unsigned int src_len,
1311 unsigned int src_ofs, unsigned int n_bits)
1313 ovs_be64 value = htonll(0);
1315 bitwise_copy(src, src_len, src_ofs,
1316 &value, sizeof value, 0,
1318 return ntohll(value);
1339 skip_spaces(const char *s)
1341 while (isspace((unsigned char) *s)) {
1348 scan_int(const char *s, const struct scan_spec *spec, int base, va_list *args)
1350 const char *start = s;
1355 negative = *s == '-';
1356 s += *s == '-' || *s == '+';
1358 if ((!base || base == 16) && *s == '0' && (s[1] == 'x' || s[1] == 'X')) {
1362 base = *s == '0' ? 8 : 10;
1365 if (s - start >= spec->width) {
1371 while (s - start < spec->width) {
1372 int digit = hexit_value(*s);
1374 if (digit < 0 || digit >= base) {
1377 value = value * base + digit;
1389 switch (spec->type) {
1393 *va_arg(*args, char *) = value;
1396 *va_arg(*args, short int *) = value;
1399 *va_arg(*args, int *) = value;
1402 *va_arg(*args, long int *) = value;
1405 *va_arg(*args, long long int *) = value;
1408 *va_arg(*args, intmax_t *) = value;
1410 case SCAN_PTRDIFF_T:
1411 *va_arg(*args, ptrdiff_t *) = value;
1414 *va_arg(*args, size_t *) = value;
1421 skip_digits(const char *s)
1423 while (*s >= '0' && *s <= '9') {
1430 scan_float(const char *s, const struct scan_spec *spec, va_list *args)
1432 const char *start = s;
1438 s += *s == '+' || *s == '-';
1441 s = skip_digits(s + 1);
1443 if (*s == 'e' || *s == 'E') {
1445 s += *s == '+' || *s == '-';
1449 if (s - start > spec->width) {
1450 s = start + spec->width;
1453 copy = xmemdup0(start, s - start);
1454 value = strtold(copy, &tail);
1461 switch (spec->type) {
1465 *va_arg(*args, float *) = value;
1468 *va_arg(*args, double *) = value;
1471 *va_arg(*args, long double *) = value;
1477 case SCAN_PTRDIFF_T:
1485 scan_output_string(const struct scan_spec *spec,
1486 const char *s, size_t n,
1489 if (spec->type != SCAN_DISCARD) {
1490 char *out = va_arg(*args, char *);
1497 scan_string(const char *s, const struct scan_spec *spec, va_list *args)
1501 for (n = 0; n < spec->width; n++) {
1502 if (!s[n] || isspace((unsigned char) s[n])) {
1510 scan_output_string(spec, s, n, args);
1515 parse_scanset(const char *p_, unsigned long *set, bool *complemented)
1517 const uint8_t *p = (const uint8_t *) p_;
1519 *complemented = *p == '^';
1523 bitmap_set1(set, ']');
1527 while (*p && *p != ']') {
1528 if (p[1] == '-' && p[2] != ']' && p[2] > *p) {
1529 bitmap_set_multiple(set, *p, p[2] - *p + 1, true);
1532 bitmap_set1(set, *p++);
1538 return (const char *) p;
1542 scan_set(const char *s, const struct scan_spec *spec, const char **pp,
1545 unsigned long set[BITMAP_N_LONGS(UCHAR_MAX + 1)];
1549 /* Parse the scan set. */
1550 memset(set, 0, sizeof set);
1551 *pp = parse_scanset(*pp, set, &complemented);
1553 /* Parse the data. */
1556 && bitmap_is_set(set, (unsigned char) s[n]) == !complemented
1557 && n < spec->width) {
1563 scan_output_string(spec, s, n, args);
1568 scan_chars(const char *s, const struct scan_spec *spec, va_list *args)
1570 unsigned int n = spec->width == UINT_MAX ? 1 : spec->width;
1572 if (strlen(s) < n) {
1575 if (spec->type != SCAN_DISCARD) {
1576 memcpy(va_arg(*args, char *), s, n);
1581 /* This is an implementation of the standard sscanf() function, with the
1582 * following exceptions:
1584 * - It returns true if the entire format was successfully scanned and
1585 * converted, false if any conversion failed.
1587 * - The standard doesn't define sscanf() behavior when an out-of-range value
1588 * is scanned, e.g. if a "%"PRIi8 conversion scans "-1" or "0x1ff". Some
1589 * implementations consider this an error and stop scanning. This
1590 * implementation never considers an out-of-range value an error; instead,
1591 * it stores the least-significant bits of the converted value in the
1592 * destination, e.g. the value 255 for both examples earlier.
1594 * - Only single-byte characters are supported, that is, the 'l' modifier
1595 * on %s, %[, and %c is not supported. The GNU extension 'a' modifier is
1596 * also not supported.
1598 * - %p is not supported.
1601 ovs_scan(const char *s, const char *format, ...)
1603 const char *const start = s;
1608 va_start(args, format);
1610 while (*p != '\0') {
1611 struct scan_spec spec;
1612 unsigned char c = *p++;
1618 } else if (c != '%') {
1624 } else if (*p == '%') {
1632 /* Parse '*' flag. */
1633 discard = *p == '*';
1636 /* Parse field width. */
1638 while (*p >= '0' && *p <= '9') {
1639 spec.width = spec.width * 10 + (*p++ - '0');
1641 if (spec.width == 0) {
1642 spec.width = UINT_MAX;
1645 /* Parse type modifier. */
1649 spec.type = SCAN_CHAR;
1652 spec.type = SCAN_SHORT;
1658 spec.type = SCAN_INTMAX_T;
1664 spec.type = SCAN_LLONG;
1667 spec.type = SCAN_LONG;
1674 spec.type = SCAN_LLONG;
1679 spec.type = SCAN_PTRDIFF_T;
1684 spec.type = SCAN_SIZE_T;
1689 spec.type = SCAN_INT;
1694 spec.type = SCAN_DISCARD;
1698 if (c != 'c' && c != 'n' && c != '[') {
1703 s = scan_int(s, &spec, 10, &args);
1707 s = scan_int(s, &spec, 0, &args);
1711 s = scan_int(s, &spec, 8, &args);
1715 s = scan_int(s, &spec, 10, &args);
1720 s = scan_int(s, &spec, 16, &args);
1728 s = scan_float(s, &spec, &args);
1732 s = scan_string(s, &spec, &args);
1736 s = scan_set(s, &spec, &p, &args);
1740 s = scan_chars(s, &spec, &args);
1744 if (spec.type != SCAN_DISCARD) {
1745 *va_arg(args, int *) = s - start;
1762 xsleep(unsigned int seconds)
1764 ovsrcu_quiesce_start();
1766 Sleep(seconds * 1000);
1770 ovsrcu_quiesce_end();
1776 ovs_format_message(int error)
1778 enum { BUFSIZE = sizeof strerror_buffer_get()->s };
1779 char *buffer = strerror_buffer_get()->s;
1781 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
1782 NULL, error, 0, buffer, BUFSIZE, NULL);
1786 /* Returns a null-terminated string that explains the last error.
1787 * Use this function to get the error string for WINAPI calls. */
1789 ovs_lasterror_to_string(void)
1791 return ovs_format_message(GetLastError());
1795 ftruncate(int fd, off_t length)
1799 error = _chsize_s(fd, length);