1 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
2 /* dbus-string.c String utility class (internal to D-Bus implementation)
4 * Copyright (C) 2002, 2003, 2004, 2005 Red Hat, Inc.
5 * Copyright (C) 2006 Ralf Habacker <ralf.habacker@freenet.de>
7 * Licensed under the Academic Free License version 2.1
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 #include "dbus-internals.h"
27 #include "dbus-string.h"
28 /* we allow a system header here, for speed/convenience */
32 #define DBUS_CAN_USE_DBUS_STRING_PRIVATE 1
33 #include "dbus-string-private.h"
34 #include "dbus-marshal-basic.h" /* probably should be removed by moving the usage of DBUS_TYPE
35 * into the marshaling-related files
37 /* for DBUS_VA_COPY */
38 #include "dbus-sysdeps.h"
41 * @defgroup DBusString DBusString class
42 * @ingroup DBusInternals
43 * @brief DBusString data structure for safer string handling
45 * Types and functions related to DBusString. DBusString is intended
46 * to be a string class that makes it hard to mess up security issues
47 * (and just in general harder to write buggy code). It should be
48 * used (or extended and then used) rather than the libc stuff in
49 * string.h. The string class is a bit inconvenient at spots because
50 * it handles out-of-memory failures and tries to be extra-robust.
52 * A DBusString has a maximum length set at initialization time; this
53 * can be used to ensure that a buffer doesn't get too big. The
54 * _dbus_string_lengthen() method checks for overflow, and for max
55 * length being exceeded.
57 * Try to avoid conversion to a plain C string, i.e. add methods on
58 * the string object instead, only convert to C string when passing
59 * things out to the public API. In particular, no sprintf, strcpy,
60 * strcat, any of that should be used. The GString feature of
61 * accepting negative numbers for "length of string" is also absent,
62 * because it could keep us from detecting bogus huge lengths. i.e. if
63 * we passed in some bogus huge length it would be taken to mean
64 * "current length of string" instead of "broken crack"
66 * @todo #DBusString needs a lot of cleaning up; some of the
67 * API is no longer used, and the API is pretty inconsistent.
68 * In particular all the "append" APIs, especially those involving
69 * alignment but probably lots of them, are no longer used by the
70 * marshaling code which always does "inserts" now.
74 * @addtogroup DBusString
79 fixup_alignment (DBusRealString *real)
81 unsigned char *aligned;
82 unsigned char *real_block;
83 unsigned int old_align_offset;
85 /* we have to have extra space in real->allocated for the align offset and nul byte */
86 _dbus_assert (real->len <= real->allocated - _DBUS_STRING_ALLOCATION_PADDING);
88 old_align_offset = real->align_offset;
89 real_block = real->str - old_align_offset;
91 aligned = _DBUS_ALIGN_ADDRESS (real_block, 8);
93 real->align_offset = aligned - real_block;
96 if (old_align_offset != real->align_offset)
98 /* Here comes the suck */
99 memmove (real_block + real->align_offset,
100 real_block + old_align_offset,
104 _dbus_assert (real->align_offset < 8);
105 _dbus_assert (_DBUS_ALIGN_ADDRESS (real->str, 8) == real->str);
109 undo_alignment (DBusRealString *real)
111 if (real->align_offset != 0)
113 memmove (real->str - real->align_offset,
117 real->str = real->str - real->align_offset;
118 real->align_offset = 0;
123 * Initializes a string that can be up to the given allocation size
124 * before it has to realloc. The string starts life with zero length.
125 * The string must eventually be freed with _dbus_string_free().
127 * @param str memory to hold the string
128 * @param allocate_size amount to preallocate
129 * @returns #TRUE on success, #FALSE if no memory
132 _dbus_string_init_preallocated (DBusString *str,
135 DBusRealString *real;
137 _dbus_assert (str != NULL);
139 _dbus_assert (sizeof (DBusString) == sizeof (DBusRealString));
141 real = (DBusRealString*) str;
143 /* It's very important not to touch anything
144 * other than real->str if we're going to fail,
145 * since we also use this function to reset
146 * an existing string, e.g. in _dbus_string_steal_data()
149 real->str = dbus_malloc (_DBUS_STRING_ALLOCATION_PADDING + allocate_size);
150 if (real->str == NULL)
153 real->allocated = _DBUS_STRING_ALLOCATION_PADDING + allocate_size;
155 real->str[real->len] = '\0';
157 real->constant = FALSE;
158 real->locked = FALSE;
159 real->invalid = FALSE;
160 real->align_offset = 0;
162 fixup_alignment (real);
168 * Initializes a string. The string starts life with zero length. The
169 * string must eventually be freed with _dbus_string_free().
171 * @param str memory to hold the string
172 * @returns #TRUE on success, #FALSE if no memory
175 _dbus_string_init (DBusString *str)
177 return _dbus_string_init_preallocated (str, 0);
181 * Initializes a constant string. The value parameter is not copied
182 * (should be static), and the string may never be modified.
183 * It is safe but not necessary to call _dbus_string_free()
184 * on a const string. The string has a length limit of MAXINT - 8.
186 * @param str memory to use for the string
187 * @param value a string to be stored in str (not copied!!!)
190 _dbus_string_init_const (DBusString *str,
193 _dbus_assert (value != NULL);
195 _dbus_string_init_const_len (str, value,
200 * Initializes a constant string with a length. The value parameter is
201 * not copied (should be static), and the string may never be
202 * modified. It is safe but not necessary to call _dbus_string_free()
205 * @param str memory to use for the string
206 * @param value a string to be stored in str (not copied!!!)
207 * @param len the length to use
210 _dbus_string_init_const_len (DBusString *str,
214 DBusRealString *real;
216 _dbus_assert (str != NULL);
217 _dbus_assert (len == 0 || value != NULL);
218 _dbus_assert (len <= _DBUS_STRING_MAX_LENGTH);
219 _dbus_assert (len >= 0);
221 real = (DBusRealString*) str;
223 real->str = (unsigned char*) value;
225 real->allocated = real->len + _DBUS_STRING_ALLOCATION_PADDING; /* a lie, just to avoid special-case assertions... */
226 real->constant = TRUE;
228 real->invalid = FALSE;
229 real->align_offset = 0;
231 /* We don't require const strings to be 8-byte aligned as the
232 * memory is coming from elsewhere.
237 * Frees a string created by _dbus_string_init().
239 * @param str memory where the string is stored.
242 _dbus_string_free (DBusString *str)
244 DBusRealString *real = (DBusRealString*) str;
245 DBUS_GENERIC_STRING_PREAMBLE (real);
249 dbus_free (real->str - real->align_offset);
251 real->invalid = TRUE;
255 compact (DBusRealString *real,
258 unsigned char *new_str;
262 waste = real->allocated - (real->len + _DBUS_STRING_ALLOCATION_PADDING);
264 if (waste <= max_waste)
267 new_allocated = real->len + _DBUS_STRING_ALLOCATION_PADDING;
269 new_str = dbus_realloc (real->str - real->align_offset, new_allocated);
270 if (_DBUS_UNLIKELY (new_str == NULL))
273 real->str = new_str + real->align_offset;
274 real->allocated = new_allocated;
275 fixup_alignment (real);
280 #ifdef DBUS_BUILD_TESTS
281 /* Not using this feature at the moment,
282 * so marked DBUS_BUILD_TESTS-only
285 * Locks a string such that any attempts to change the string will
286 * result in aborting the program. Also, if the string is wasting a
287 * lot of memory (allocation is sufficiently larger than what the
288 * string is really using), _dbus_string_lock() will realloc the
289 * string's data to "compact" it.
291 * @param str the string to lock.
294 _dbus_string_lock (DBusString *str)
296 DBUS_LOCKED_STRING_PREAMBLE (str); /* can lock multiple times */
300 /* Try to realloc to avoid excess memory usage, since
301 * we know we won't change the string further
304 compact (real, MAX_WASTE);
306 #endif /* DBUS_BUILD_TESTS */
309 reallocate_for_length (DBusRealString *real,
313 unsigned char *new_str;
315 /* at least double our old allocation to avoid O(n), avoiding
318 if (real->allocated > (_DBUS_STRING_MAX_LENGTH + _DBUS_STRING_ALLOCATION_PADDING) / 2)
319 new_allocated = _DBUS_STRING_MAX_LENGTH + _DBUS_STRING_ALLOCATION_PADDING;
321 new_allocated = real->allocated * 2;
323 /* if you change the code just above here, run the tests without
324 * the following assert-only hack before you commit
326 /* This is keyed off asserts in addition to tests so when you
327 * disable asserts to profile, you don't get this destroyer
330 #ifdef DBUS_DISABLE_ASSERT
332 #ifdef DBUS_BUILD_TESTS
333 new_allocated = 0; /* ensure a realloc every time so that we go
334 * through all malloc failure codepaths
336 #endif /* DBUS_BUILD_TESTS */
337 #endif /* !DBUS_DISABLE_ASSERT */
339 /* But be sure we always alloc at least space for the new length */
340 new_allocated = MAX (new_allocated,
341 new_length + _DBUS_STRING_ALLOCATION_PADDING);
343 _dbus_assert (new_allocated >= real->allocated); /* code relies on this */
344 new_str = dbus_realloc (real->str - real->align_offset, new_allocated);
345 if (_DBUS_UNLIKELY (new_str == NULL))
348 real->str = new_str + real->align_offset;
349 real->allocated = new_allocated;
350 fixup_alignment (real);
356 * Compacts the string to avoid wasted memory. Wasted memory is
357 * memory that is allocated but not actually required to store the
358 * current length of the string. The compact is only done if more
359 * than the given amount of memory is being wasted (otherwise the
360 * waste is ignored and the call does nothing).
362 * @param str the string
363 * @param max_waste the maximum amount of waste to ignore
364 * @returns #FALSE if the compact failed due to realloc failure
367 _dbus_string_compact (DBusString *str,
370 DBUS_STRING_PREAMBLE (str);
372 return compact (real, max_waste);
376 set_length (DBusRealString *real,
379 /* Note, we are setting the length not including nul termination */
381 /* exceeding max length is the same as failure to allocate memory */
382 if (_DBUS_UNLIKELY (new_length > _DBUS_STRING_MAX_LENGTH))
384 else if (new_length > (real->allocated - _DBUS_STRING_ALLOCATION_PADDING) &&
385 _DBUS_UNLIKELY (!reallocate_for_length (real, new_length)))
389 real->len = new_length;
390 real->str[new_length] = '\0';
397 DBusRealString *dest,
403 if (len > _DBUS_STRING_MAX_LENGTH - dest->len)
404 return FALSE; /* detected overflow of dest->len + len below */
406 if (!set_length (dest, dest->len + len))
409 memmove (dest->str + insert_at + len,
410 dest->str + insert_at,
411 dest->len - len - insert_at);
416 #ifndef _dbus_string_get_data
418 * Gets the raw character buffer from the string. The returned buffer
419 * will be nul-terminated, but note that strings may contain binary
420 * data so there may be extra nul characters prior to the termination.
421 * This function should be little-used, extend DBusString or add
422 * stuff to dbus-sysdeps.c instead. It's an error to use this
423 * function on a const string.
425 * @param str the string
429 _dbus_string_get_data (DBusString *str)
431 DBUS_STRING_PREAMBLE (str);
433 return (char*) real->str;
435 #endif /* _dbus_string_get_data */
437 /* only do the function if we don't have the macro */
438 #ifndef _dbus_string_get_const_data
440 * Gets the raw character buffer from a const string.
442 * @param str the string
443 * @returns the string data
446 _dbus_string_get_const_data (const DBusString *str)
448 DBUS_CONST_STRING_PREAMBLE (str);
450 return (const char*) real->str;
452 #endif /* _dbus_string_get_const_data */
455 * Gets a sub-portion of the raw character buffer from the
456 * string. The "len" field is required simply for error
457 * checking, to be sure you don't try to use more
458 * string than exists. The nul termination of the
459 * returned buffer remains at the end of the entire
460 * string, not at start + len.
462 * @param str the string
463 * @param start byte offset to return
464 * @param len length of segment to return
465 * @returns the string data
468 _dbus_string_get_data_len (DBusString *str,
472 DBUS_STRING_PREAMBLE (str);
473 _dbus_assert (start >= 0);
474 _dbus_assert (len >= 0);
475 _dbus_assert (start <= real->len);
476 _dbus_assert (len <= real->len - start);
478 return (char*) real->str + start;
481 /* only do the function if we don't have the macro */
482 #ifndef _dbus_string_get_const_data_len
484 * const version of _dbus_string_get_data_len().
486 * @param str the string
487 * @param start byte offset to return
488 * @param len length of segment to return
489 * @returns the string data
492 _dbus_string_get_const_data_len (const DBusString *str,
496 DBUS_CONST_STRING_PREAMBLE (str);
497 _dbus_assert (start >= 0);
498 _dbus_assert (len >= 0);
499 _dbus_assert (start <= real->len);
500 _dbus_assert (len <= real->len - start);
502 return (const char*) real->str + start;
504 #endif /* _dbus_string_get_const_data_len */
506 /* only do the function if we don't have the macro */
507 #ifndef _dbus_string_set_byte
509 * Sets the value of the byte at the given position.
511 * @param str the string
512 * @param i the position
513 * @param byte the new value
516 _dbus_string_set_byte (DBusString *str,
520 DBUS_STRING_PREAMBLE (str);
521 _dbus_assert (i < real->len);
522 _dbus_assert (i >= 0);
526 #endif /* _dbus_string_set_byte */
528 /* only have the function if we didn't create a macro */
529 #ifndef _dbus_string_get_byte
531 * Gets the byte at the given position. It is
532 * allowed to ask for the nul byte at the end of
535 * @param str the string
536 * @param start the position
537 * @returns the byte at that position
540 _dbus_string_get_byte (const DBusString *str,
543 DBUS_CONST_STRING_PREAMBLE (str);
544 _dbus_assert (start <= real->len);
545 _dbus_assert (start >= 0);
547 return real->str[start];
549 #endif /* _dbus_string_get_byte */
552 * Inserts a number of bytes of a given value at the
555 * @param str the string
556 * @param i the position
557 * @param n_bytes number of bytes
558 * @param byte the value to insert
559 * @returns #TRUE on success
562 _dbus_string_insert_bytes (DBusString *str,
567 DBUS_STRING_PREAMBLE (str);
568 _dbus_assert (i <= real->len);
569 _dbus_assert (i >= 0);
570 _dbus_assert (n_bytes >= 0);
575 if (!open_gap (n_bytes, real, i))
578 memset (real->str + i, byte, n_bytes);
584 * Inserts a single byte at the given position.
586 * @param str the string
587 * @param i the position
588 * @param byte the value to insert
589 * @returns #TRUE on success
592 _dbus_string_insert_byte (DBusString *str,
596 DBUS_STRING_PREAMBLE (str);
597 _dbus_assert (i <= real->len);
598 _dbus_assert (i >= 0);
600 if (!open_gap (1, real, i))
609 * Like _dbus_string_get_data(), but removes the
610 * gotten data from the original string. The caller
611 * must free the data returned. This function may
612 * fail due to lack of memory, and return #FALSE.
614 * @param str the string
615 * @param data_return location to return the buffer
616 * @returns #TRUE on success
619 _dbus_string_steal_data (DBusString *str,
622 DBUS_STRING_PREAMBLE (str);
623 _dbus_assert (data_return != NULL);
625 undo_alignment (real);
627 *data_return = (char*) real->str;
629 /* reset the string */
630 if (!_dbus_string_init (str))
632 /* hrm, put it back then */
633 real->str = (unsigned char*) *data_return;
635 fixup_alignment (real);
643 * Copies the data from the string into a char*
645 * @param str the string
646 * @param data_return place to return the data
647 * @returns #TRUE on success, #FALSE on no memory
650 _dbus_string_copy_data (const DBusString *str,
653 DBUS_CONST_STRING_PREAMBLE (str);
654 _dbus_assert (data_return != NULL);
656 *data_return = dbus_malloc (real->len + 1);
657 if (*data_return == NULL)
660 memcpy (*data_return, real->str, real->len + 1);
666 * Copies the contents of a DBusString into a different buffer. It is
667 * a bug if avail_len is too short to hold the string contents. nul
668 * termination is not copied, just the supplied bytes.
670 * @param str a string
671 * @param buffer a C buffer to copy data to
672 * @param avail_len maximum length of C buffer
675 _dbus_string_copy_to_buffer (const DBusString *str,
679 DBUS_CONST_STRING_PREAMBLE (str);
681 _dbus_assert (avail_len >= 0);
682 _dbus_assert (avail_len >= real->len);
684 memcpy (buffer, real->str, real->len);
688 * Copies the contents of a DBusString into a different buffer. It is
689 * a bug if avail_len is too short to hold the string contents plus a
692 * @param str a string
693 * @param buffer a C buffer to copy data to
694 * @param avail_len maximum length of C buffer
697 _dbus_string_copy_to_buffer_with_nul (const DBusString *str,
701 DBUS_CONST_STRING_PREAMBLE (str);
703 _dbus_assert (avail_len >= 0);
704 _dbus_assert (avail_len > real->len);
706 memcpy (buffer, real->str, real->len+1);
709 /* Only have the function if we don't have the macro */
710 #ifndef _dbus_string_get_length
712 * Gets the length of a string (not including nul termination).
714 * @returns the length.
717 _dbus_string_get_length (const DBusString *str)
719 DBUS_CONST_STRING_PREAMBLE (str);
723 #endif /* !_dbus_string_get_length */
726 * Makes a string longer by the given number of bytes. Checks whether
727 * adding additional_length to the current length would overflow an
728 * integer, and checks for exceeding a string's max length.
729 * The new bytes are not initialized, other than nul-terminating
730 * the end of the string. The uninitialized bytes may contain
731 * nul bytes or other junk.
733 * @param str a string
734 * @param additional_length length to add to the string.
735 * @returns #TRUE on success.
738 _dbus_string_lengthen (DBusString *str,
739 int additional_length)
741 DBUS_STRING_PREAMBLE (str);
742 _dbus_assert (additional_length >= 0);
744 if (_DBUS_UNLIKELY (additional_length > _DBUS_STRING_MAX_LENGTH - real->len))
745 return FALSE; /* would overflow */
747 return set_length (real,
748 real->len + additional_length);
752 * Makes a string shorter by the given number of bytes.
754 * @param str a string
755 * @param length_to_remove length to remove from the string.
758 _dbus_string_shorten (DBusString *str,
759 int length_to_remove)
761 DBUS_STRING_PREAMBLE (str);
762 _dbus_assert (length_to_remove >= 0);
763 _dbus_assert (length_to_remove <= real->len);
766 real->len - length_to_remove);
770 * Sets the length of a string. Can be used to truncate or lengthen
771 * the string. If the string is lengthened, the function may fail and
772 * return #FALSE. Newly-added bytes are not initialized, as with
773 * _dbus_string_lengthen().
775 * @param str a string
776 * @param length new length of the string.
777 * @returns #FALSE on failure.
780 _dbus_string_set_length (DBusString *str,
783 DBUS_STRING_PREAMBLE (str);
784 _dbus_assert (length >= 0);
786 return set_length (real, length);
790 align_insert_point_then_open_gap (DBusString *str,
795 unsigned long new_len; /* ulong to avoid _DBUS_ALIGN_VALUE overflow */
796 unsigned long gap_pos;
799 DBUS_STRING_PREAMBLE (str);
800 _dbus_assert (alignment >= 1);
801 _dbus_assert (alignment <= 8); /* it has to be a bug if > 8 */
803 insert_at = *insert_at_p;
805 _dbus_assert (insert_at <= real->len);
807 gap_pos = _DBUS_ALIGN_VALUE (insert_at, alignment);
808 new_len = real->len + (gap_pos - insert_at) + gap_size;
810 if (_DBUS_UNLIKELY (new_len > (unsigned long) _DBUS_STRING_MAX_LENGTH))
813 delta = new_len - real->len;
814 _dbus_assert (delta >= 0);
816 if (delta == 0) /* only happens if gap_size == 0 and insert_at is aligned already */
818 _dbus_assert (((unsigned long) *insert_at_p) == gap_pos);
822 if (_DBUS_UNLIKELY (!open_gap (new_len - real->len,
826 /* nul the padding if we had to add any padding */
827 if (gap_size < delta)
829 memset (&real->str[insert_at], '\0',
830 gap_pos - insert_at);
833 *insert_at_p = gap_pos;
839 align_length_then_lengthen (DBusString *str,
841 int then_lengthen_by)
845 insert_at = _dbus_string_get_length (str);
847 return align_insert_point_then_open_gap (str,
849 alignment, then_lengthen_by);
853 * Align the length of a string to a specific alignment (typically 4 or 8)
854 * by appending nul bytes to the string.
856 * @param str a string
857 * @param alignment the alignment
858 * @returns #FALSE if no memory
861 _dbus_string_align_length (DBusString *str,
864 return align_length_then_lengthen (str, alignment, 0);
868 * Preallocate extra_bytes such that a future lengthening of the
869 * string by extra_bytes is guaranteed to succeed without an out of
872 * @param str a string
873 * @param extra_bytes bytes to alloc
874 * @returns #FALSE if no memory
877 _dbus_string_alloc_space (DBusString *str,
880 if (!_dbus_string_lengthen (str, extra_bytes))
882 _dbus_string_shorten (str, extra_bytes);
888 append (DBusRealString *real,
895 if (!_dbus_string_lengthen ((DBusString*)real, buffer_len))
898 memcpy (real->str + (real->len - buffer_len),
906 * Appends a nul-terminated C-style string to a DBusString.
908 * @param str the DBusString
909 * @param buffer the nul-terminated characters to append
910 * @returns #FALSE if not enough memory.
913 _dbus_string_append (DBusString *str,
916 unsigned long buffer_len;
918 DBUS_STRING_PREAMBLE (str);
919 _dbus_assert (buffer != NULL);
921 buffer_len = strlen (buffer);
922 if (buffer_len > (unsigned long) _DBUS_STRING_MAX_LENGTH)
925 return append (real, buffer, buffer_len);
928 /** assign 2 bytes from one string to another */
929 #define ASSIGN_2_OCTETS(p, octets) \
930 *((dbus_uint16_t*)(p)) = *((dbus_uint16_t*)(octets));
932 /** assign 4 bytes from one string to another */
933 #define ASSIGN_4_OCTETS(p, octets) \
934 *((dbus_uint32_t*)(p)) = *((dbus_uint32_t*)(octets));
936 #ifdef DBUS_HAVE_INT64
937 /** assign 8 bytes from one string to another */
938 #define ASSIGN_8_OCTETS(p, octets) \
939 *((dbus_uint64_t*)(p)) = *((dbus_uint64_t*)(octets));
941 /** assign 8 bytes from one string to another */
942 #define ASSIGN_8_OCTETS(p, octets) \
956 _dbus_assert (b == p + 8); \
958 #endif /* DBUS_HAVE_INT64 */
961 * Inserts 2 bytes aligned on a 2 byte boundary
962 * with any alignment padding initialized to 0.
964 * @param str the DBusString
965 * @param insert_at where to insert
966 * @param octets 2 bytes to insert
967 * @returns #FALSE if not enough memory.
970 _dbus_string_insert_2_aligned (DBusString *str,
972 const unsigned char octets[4])
974 DBUS_STRING_PREAMBLE (str);
976 if (!align_insert_point_then_open_gap (str, &insert_at, 2, 2))
979 ASSIGN_2_OCTETS (real->str + insert_at, octets);
985 * Inserts 4 bytes aligned on a 4 byte boundary
986 * with any alignment padding initialized to 0.
988 * @param str the DBusString
989 * @param insert_at where to insert
990 * @param octets 4 bytes to insert
991 * @returns #FALSE if not enough memory.
994 _dbus_string_insert_4_aligned (DBusString *str,
996 const unsigned char octets[4])
998 DBUS_STRING_PREAMBLE (str);
1000 if (!align_insert_point_then_open_gap (str, &insert_at, 4, 4))
1003 ASSIGN_4_OCTETS (real->str + insert_at, octets);
1009 * Inserts 8 bytes aligned on an 8 byte boundary
1010 * with any alignment padding initialized to 0.
1012 * @param str the DBusString
1013 * @param insert_at where to insert
1014 * @param octets 8 bytes to insert
1015 * @returns #FALSE if not enough memory.
1018 _dbus_string_insert_8_aligned (DBusString *str,
1020 const unsigned char octets[8])
1022 DBUS_STRING_PREAMBLE (str);
1024 if (!align_insert_point_then_open_gap (str, &insert_at, 8, 8))
1027 _dbus_assert (_DBUS_ALIGN_VALUE (insert_at, 8) == (unsigned) insert_at);
1029 ASSIGN_8_OCTETS (real->str + insert_at, octets);
1036 * Inserts padding at *insert_at such to align it to the given
1037 * boundary. Initializes the padding to nul bytes. Sets *insert_at
1038 * to the aligned position.
1040 * @param str the DBusString
1041 * @param insert_at location to be aligned
1042 * @param alignment alignment boundary (1, 2, 4, or 8)
1043 * @returns #FALSE if not enough memory.
1046 _dbus_string_insert_alignment (DBusString *str,
1050 DBUS_STRING_PREAMBLE (str);
1052 if (!align_insert_point_then_open_gap (str, insert_at, alignment, 0))
1055 _dbus_assert (_DBUS_ALIGN_VALUE (*insert_at, alignment) == (unsigned) *insert_at);
1061 * Appends a printf-style formatted string
1062 * to the #DBusString.
1064 * @param str the string
1065 * @param format printf format
1066 * @param args variable argument list
1067 * @returns #FALSE if no memory
1070 _dbus_string_append_printf_valist (DBusString *str,
1077 DBUS_STRING_PREAMBLE (str);
1079 DBUS_VA_COPY (args_copy, args);
1081 /* Measure the message length without terminating nul */
1082 len = _dbus_printf_string_upper_bound (format, args);
1087 if (!_dbus_string_lengthen (str, len))
1089 /* don't leak the copy */
1094 vsprintf ((char*) (real->str + (real->len - len)),
1103 * Appends a printf-style formatted string
1104 * to the #DBusString.
1106 * @param str the string
1107 * @param format printf format
1108 * @returns #FALSE if no memory
1111 _dbus_string_append_printf (DBusString *str,
1118 va_start (args, format);
1119 retval = _dbus_string_append_printf_valist (str, format, args);
1126 * Appends block of bytes with the given length to a DBusString.
1128 * @param str the DBusString
1129 * @param buffer the bytes to append
1130 * @param len the number of bytes to append
1131 * @returns #FALSE if not enough memory.
1134 _dbus_string_append_len (DBusString *str,
1138 DBUS_STRING_PREAMBLE (str);
1139 _dbus_assert (buffer != NULL);
1140 _dbus_assert (len >= 0);
1142 return append (real, buffer, len);
1146 * Appends a single byte to the string, returning #FALSE
1147 * if not enough memory.
1149 * @param str the string
1150 * @param byte the byte to append
1151 * @returns #TRUE on success
1154 _dbus_string_append_byte (DBusString *str,
1157 DBUS_STRING_PREAMBLE (str);
1159 if (!set_length (real, real->len + 1))
1162 real->str[real->len-1] = byte;
1167 #ifdef DBUS_BUILD_TESTS
1169 * Appends a single Unicode character, encoding the character
1172 * @param str the string
1173 * @param ch the Unicode character
1176 _dbus_string_append_unichar (DBusString *str,
1184 DBUS_STRING_PREAMBLE (str);
1186 /* this code is from GLib but is pretty standard I think */
1195 else if (ch < 0x800)
1200 else if (ch < 0x10000)
1205 else if (ch < 0x200000)
1210 else if (ch < 0x4000000)
1221 if (len > (_DBUS_STRING_MAX_LENGTH - real->len))
1222 return FALSE; /* real->len + len would overflow */
1224 if (!set_length (real, real->len + len))
1227 out = real->str + (real->len - len);
1229 for (i = len - 1; i > 0; --i)
1231 out[i] = (ch & 0x3f) | 0x80;
1234 out[0] = ch | first;
1238 #endif /* DBUS_BUILD_TESTS */
1241 delete (DBusRealString *real,
1248 memmove (real->str + start, real->str + start + len, real->len - (start + len));
1250 real->str[real->len] = '\0';
1254 * Deletes a segment of a DBusString with length len starting at
1255 * start. (Hint: to clear an entire string, setting length to 0
1256 * with _dbus_string_set_length() is easier.)
1258 * @param str the DBusString
1259 * @param start where to start deleting
1260 * @param len the number of bytes to delete
1263 _dbus_string_delete (DBusString *str,
1267 DBUS_STRING_PREAMBLE (str);
1268 _dbus_assert (start >= 0);
1269 _dbus_assert (len >= 0);
1270 _dbus_assert (start <= real->len);
1271 _dbus_assert (len <= real->len - start);
1273 delete (real, start, len);
1277 copy (DBusRealString *source,
1280 DBusRealString *dest,
1286 if (!open_gap (len, dest, insert_at))
1289 memmove (dest->str + insert_at,
1290 source->str + start,
1297 * Checks assertions for two strings we're copying a segment between,
1298 * and declares real_source/real_dest variables.
1300 * @param source the source string
1301 * @param start the starting offset
1302 * @param dest the dest string
1303 * @param insert_at where the copied segment is inserted
1305 #define DBUS_STRING_COPY_PREAMBLE(source, start, dest, insert_at) \
1306 DBusRealString *real_source = (DBusRealString*) source; \
1307 DBusRealString *real_dest = (DBusRealString*) dest; \
1308 _dbus_assert ((source) != (dest)); \
1309 DBUS_GENERIC_STRING_PREAMBLE (real_source); \
1310 DBUS_GENERIC_STRING_PREAMBLE (real_dest); \
1311 _dbus_assert (!real_dest->constant); \
1312 _dbus_assert (!real_dest->locked); \
1313 _dbus_assert ((start) >= 0); \
1314 _dbus_assert ((start) <= real_source->len); \
1315 _dbus_assert ((insert_at) >= 0); \
1316 _dbus_assert ((insert_at) <= real_dest->len)
1319 * Moves the end of one string into another string. Both strings
1320 * must be initialized, valid strings.
1322 * @param source the source string
1323 * @param start where to chop off the source string
1324 * @param dest the destination string
1325 * @param insert_at where to move the chopped-off part of source string
1326 * @returns #FALSE if not enough memory
1329 _dbus_string_move (DBusString *source,
1334 DBusRealString *real_source = (DBusRealString*) source;
1335 _dbus_assert (start <= real_source->len);
1337 return _dbus_string_move_len (source, start,
1338 real_source->len - start,
1343 * Like _dbus_string_move(), but does not delete the section
1344 * of the source string that's copied to the dest string.
1346 * @param source the source string
1347 * @param start where to start copying the source string
1348 * @param dest the destination string
1349 * @param insert_at where to place the copied part of source string
1350 * @returns #FALSE if not enough memory
1353 _dbus_string_copy (const DBusString *source,
1358 DBUS_STRING_COPY_PREAMBLE (source, start, dest, insert_at);
1360 return copy (real_source, start,
1361 real_source->len - start,
1367 * Like _dbus_string_move(), but can move a segment from
1368 * the middle of the source string.
1370 * @param source the source string
1371 * @param start first byte of source string to move
1372 * @param len length of segment to move
1373 * @param dest the destination string
1374 * @param insert_at where to move the bytes from the source string
1375 * @returns #FALSE if not enough memory
1378 _dbus_string_move_len (DBusString *source,
1385 DBUS_STRING_COPY_PREAMBLE (source, start, dest, insert_at);
1386 _dbus_assert (len >= 0);
1387 _dbus_assert ((start + len) <= real_source->len);
1394 else if (start == 0 &&
1395 len == real_source->len &&
1396 real_dest->len == 0)
1398 /* Short-circuit moving an entire existing string to an empty string
1399 * by just swapping the buffers.
1401 /* we assume ->constant doesn't matter as you can't have
1402 * a constant string involved in a move.
1404 #define ASSIGN_DATA(a, b) do { \
1405 (a)->str = (b)->str; \
1406 (a)->len = (b)->len; \
1407 (a)->allocated = (b)->allocated; \
1408 (a)->align_offset = (b)->align_offset; \
1413 ASSIGN_DATA (&tmp, real_source);
1414 ASSIGN_DATA (real_source, real_dest);
1415 ASSIGN_DATA (real_dest, &tmp);
1421 if (!copy (real_source, start, len,
1426 delete (real_source, start,
1434 * Like _dbus_string_copy(), but can copy a segment from the middle of
1435 * the source string.
1437 * @param source the source string
1438 * @param start where to start copying the source string
1439 * @param len length of segment to copy
1440 * @param dest the destination string
1441 * @param insert_at where to place the copied segment of source string
1442 * @returns #FALSE if not enough memory
1445 _dbus_string_copy_len (const DBusString *source,
1451 DBUS_STRING_COPY_PREAMBLE (source, start, dest, insert_at);
1452 _dbus_assert (len >= 0);
1453 _dbus_assert (start <= real_source->len);
1454 _dbus_assert (len <= real_source->len - start);
1456 return copy (real_source, start, len,
1462 * Replaces a segment of dest string with a segment of source string.
1464 * @param source the source string
1465 * @param start where to start copying the source string
1466 * @param len length of segment to copy
1467 * @param dest the destination string
1468 * @param replace_at start of segment of dest string to replace
1469 * @param replace_len length of segment of dest string to replace
1470 * @returns #FALSE if not enough memory
1474 _dbus_string_replace_len (const DBusString *source,
1481 DBUS_STRING_COPY_PREAMBLE (source, start, dest, replace_at);
1482 _dbus_assert (len >= 0);
1483 _dbus_assert (start <= real_source->len);
1484 _dbus_assert (len <= real_source->len - start);
1485 _dbus_assert (replace_at >= 0);
1486 _dbus_assert (replace_at <= real_dest->len);
1487 _dbus_assert (replace_len <= real_dest->len - replace_at);
1489 if (len == replace_len)
1491 memmove (real_dest->str + replace_at,
1492 real_source->str + start, len);
1494 else if (len < replace_len)
1496 memmove (real_dest->str + replace_at,
1497 real_source->str + start, len);
1498 delete (real_dest, replace_at + len,
1505 _dbus_assert (len > replace_len);
1507 diff = len - replace_len;
1509 /* First of all we check if destination string can be enlarged as
1510 * required, then we overwrite previous bytes
1513 if (!copy (real_source, start + replace_len, diff,
1514 real_dest, replace_at + replace_len))
1517 memmove (real_dest->str + replace_at,
1518 real_source->str + start, replace_len);
1525 * Looks for the first occurance of a byte, deletes that byte,
1526 * and moves everything after the byte to the beginning of a
1527 * separate string. Both strings must be initialized, valid
1530 * @param source the source string
1531 * @param byte the byte to remove and split the string at
1532 * @param tail the split off string
1533 * @returns #FALSE if not enough memory or if byte could not be found
1537 _dbus_string_split_on_byte (DBusString *source,
1542 char byte_string[2] = "";
1546 byte_string[0] = (char) byte;
1548 if (!_dbus_string_find (source, 0, byte_string, &byte_position))
1551 head_length = byte_position;
1552 tail_length = _dbus_string_get_length (source) - head_length - 1;
1554 if (!_dbus_string_move_len (source, byte_position + 1, tail_length,
1558 /* remove the trailing delimiter byte from the head now.
1560 if (!_dbus_string_set_length (source, head_length))
1566 /* Unicode macros and utf8_validate() from GLib Owen Taylor, Havoc
1567 * Pennington, and Tom Tromey are the authors and authorized relicense.
1570 /** computes length and mask of a unicode character
1571 * @param Char the char
1572 * @param Mask the mask variable to assign to
1573 * @param Len the length variable to assign to
1575 #define UTF8_COMPUTE(Char, Mask, Len) \
1581 else if ((Char & 0xe0) == 0xc0) \
1586 else if ((Char & 0xf0) == 0xe0) \
1591 else if ((Char & 0xf8) == 0xf0) \
1596 else if ((Char & 0xfc) == 0xf8) \
1601 else if ((Char & 0xfe) == 0xfc) \
1613 * computes length of a unicode character in UTF-8
1614 * @param Char the char
1616 #define UTF8_LENGTH(Char) \
1617 ((Char) < 0x80 ? 1 : \
1618 ((Char) < 0x800 ? 2 : \
1619 ((Char) < 0x10000 ? 3 : \
1620 ((Char) < 0x200000 ? 4 : \
1621 ((Char) < 0x4000000 ? 5 : 6)))))
1624 * Gets a UTF-8 value.
1626 * @param Result variable for extracted unicode char.
1627 * @param Chars the bytes to decode
1628 * @param Count counter variable
1629 * @param Mask mask for this char
1630 * @param Len length for this char in bytes
1632 #define UTF8_GET(Result, Chars, Count, Mask, Len) \
1633 (Result) = (Chars)[0] & (Mask); \
1634 for ((Count) = 1; (Count) < (Len); ++(Count)) \
1636 if (((Chars)[(Count)] & 0xc0) != 0x80) \
1642 (Result) |= ((Chars)[(Count)] & 0x3f); \
1646 * Check whether a Unicode (5.2) char is in a valid range.
1648 * The first check comes from the Unicode guarantee to never encode
1649 * a point above 0x0010ffff, since UTF-16 couldn't represent it.
1651 * The second check covers surrogate pairs (category Cs).
1653 * The last two checks cover "Noncharacter": defined as:
1654 * "A code point that is permanently reserved for
1655 * internal use, and that should never be interchanged. In
1656 * Unicode 3.1, these consist of the values U+nFFFE and U+nFFFF
1657 * (where n is from 0 to 10_16) and the values U+FDD0..U+FDEF."
1659 * @param Char the character
1661 #define UNICODE_VALID(Char) \
1662 ((Char) < 0x110000 && \
1663 (((Char) & 0xFFFFF800) != 0xD800) && \
1664 ((Char) < 0xFDD0 || (Char) > 0xFDEF) && \
1665 ((Char) & 0xFFFE) != 0xFFFE)
1667 #ifdef DBUS_BUILD_TESTS
1669 * Gets a unicode character from a UTF-8 string. Does no validation;
1670 * you must verify that the string is valid UTF-8 in advance and must
1671 * pass in the start of a character.
1673 * @param str the string
1674 * @param start the start of the UTF-8 character.
1675 * @param ch_return location to return the character
1676 * @param end_return location to return the byte index of next character
1679 _dbus_string_get_unichar (const DBusString *str,
1681 dbus_unichar_t *ch_return,
1685 dbus_unichar_t result;
1688 DBUS_CONST_STRING_PREAMBLE (str);
1689 _dbus_assert (start >= 0);
1690 _dbus_assert (start <= real->len);
1695 *end_return = real->len;
1698 p = real->str + start;
1701 UTF8_COMPUTE (c, mask, len);
1704 UTF8_GET (result, p, i, mask, len);
1706 if (result == (dbus_unichar_t)-1)
1710 *ch_return = result;
1712 *end_return = start + len;
1714 #endif /* DBUS_BUILD_TESTS */
1717 * Finds the given substring in the string,
1718 * returning #TRUE and filling in the byte index
1719 * where the substring was found, if it was found.
1720 * Returns #FALSE if the substring wasn't found.
1721 * Sets *start to the length of the string if the substring
1724 * @param str the string
1725 * @param start where to start looking
1726 * @param substr the substring
1727 * @param found return location for where it was found, or #NULL
1728 * @returns #TRUE if found
1731 _dbus_string_find (const DBusString *str,
1736 return _dbus_string_find_to (str, start,
1737 ((const DBusRealString*)str)->len,
1742 * Finds end of line ("\r\n" or "\n") in the string,
1743 * returning #TRUE and filling in the byte index
1744 * where the eol string was found, if it was found.
1745 * Returns #FALSE if eol wasn't found.
1747 * @param str the string
1748 * @param start where to start looking
1749 * @param found return location for where eol was found or string length otherwise
1750 * @param found_len return length of found eol string or zero otherwise
1751 * @returns #TRUE if found
1754 _dbus_string_find_eol (const DBusString *str,
1761 DBUS_CONST_STRING_PREAMBLE (str);
1762 _dbus_assert (start <= real->len);
1763 _dbus_assert (start >= 0);
1766 while (i < real->len)
1768 if (real->str[i] == '\r')
1770 if ((i+1) < real->len && real->str[i+1] == '\n') /* "\r\n" */
1778 else /* only "\r" */
1787 else if (real->str[i] == '\n') /* only "\n" */
1808 * Finds the given substring in the string,
1809 * up to a certain position,
1810 * returning #TRUE and filling in the byte index
1811 * where the substring was found, if it was found.
1812 * Returns #FALSE if the substring wasn't found.
1813 * Sets *start to the length of the string if the substring
1816 * @param str the string
1817 * @param start where to start looking
1818 * @param end where to stop looking
1819 * @param substr the substring
1820 * @param found return location for where it was found, or #NULL
1821 * @returns #TRUE if found
1824 _dbus_string_find_to (const DBusString *str,
1831 DBUS_CONST_STRING_PREAMBLE (str);
1832 _dbus_assert (substr != NULL);
1833 _dbus_assert (start <= real->len);
1834 _dbus_assert (start >= 0);
1835 _dbus_assert (substr != NULL);
1836 _dbus_assert (end <= real->len);
1837 _dbus_assert (start <= end);
1839 /* we always "find" an empty string */
1840 if (*substr == '\0')
1850 if (real->str[i] == substr[0])
1856 if (substr[j - i] == '\0')
1858 else if (real->str[j] != substr[j - i])
1864 if (substr[j - i] == '\0')
1882 * Finds a blank (space or tab) in the string. Returns #TRUE
1883 * if found, #FALSE otherwise. If a blank is not found sets
1884 * *found to the length of the string.
1886 * @param str the string
1887 * @param start byte index to start looking
1888 * @param found place to store the location of the first blank
1889 * @returns #TRUE if a blank was found
1892 _dbus_string_find_blank (const DBusString *str,
1897 DBUS_CONST_STRING_PREAMBLE (str);
1898 _dbus_assert (start <= real->len);
1899 _dbus_assert (start >= 0);
1902 while (i < real->len)
1904 if (real->str[i] == ' ' ||
1905 real->str[i] == '\t')
1922 * Skips blanks from start, storing the first non-blank in *end
1923 * (blank is space or tab).
1925 * @param str the string
1926 * @param start where to start
1927 * @param end where to store the first non-blank byte index
1930 _dbus_string_skip_blank (const DBusString *str,
1935 DBUS_CONST_STRING_PREAMBLE (str);
1936 _dbus_assert (start <= real->len);
1937 _dbus_assert (start >= 0);
1940 while (i < real->len)
1942 if (!DBUS_IS_ASCII_BLANK (real->str[i]))
1948 _dbus_assert (i == real->len || !DBUS_IS_ASCII_WHITE (real->str[i]));
1956 * Skips whitespace from start, storing the first non-whitespace in *end.
1957 * (whitespace is space, tab, newline, CR).
1959 * @param str the string
1960 * @param start where to start
1961 * @param end where to store the first non-whitespace byte index
1964 _dbus_string_skip_white (const DBusString *str,
1969 DBUS_CONST_STRING_PREAMBLE (str);
1970 _dbus_assert (start <= real->len);
1971 _dbus_assert (start >= 0);
1974 while (i < real->len)
1976 if (!DBUS_IS_ASCII_WHITE (real->str[i]))
1982 _dbus_assert (i == real->len || !(DBUS_IS_ASCII_WHITE (real->str[i])));
1989 * Skips whitespace from end, storing the start index of the trailing
1990 * whitespace in *start. (whitespace is space, tab, newline, CR).
1992 * @param str the string
1993 * @param end where to start scanning backward
1994 * @param start where to store the start of whitespace chars
1997 _dbus_string_skip_white_reverse (const DBusString *str,
2002 DBUS_CONST_STRING_PREAMBLE (str);
2003 _dbus_assert (end <= real->len);
2004 _dbus_assert (end >= 0);
2009 if (!DBUS_IS_ASCII_WHITE (real->str[i-1]))
2014 _dbus_assert (i >= 0 && (i == 0 || !(DBUS_IS_ASCII_WHITE (real->str[i-1]))));
2021 * Assigns a newline-terminated or \\r\\n-terminated line from the front
2022 * of the string to the given dest string. The dest string's previous
2023 * contents are deleted. If the source string contains no newline,
2024 * moves the entire source string to the dest string.
2026 * @todo owen correctly notes that this is a stupid function (it was
2027 * written purely for test code,
2028 * e.g. dbus-message-builder.c). Probably should be enforced as test
2029 * code only with ifdef DBUS_BUILD_TESTS
2031 * @param source the source string
2032 * @param dest the destination string (contents are replaced)
2033 * @returns #FALSE if no memory, or source has length 0
2036 _dbus_string_pop_line (DBusString *source,
2041 _dbus_string_set_length (dest, 0);
2045 if (!_dbus_string_find_eol (source, 0, &eol, &eol_len))
2047 _dbus_assert (eol == _dbus_string_get_length (source));
2050 /* If there's no newline and source has zero length, we're done */
2053 /* otherwise, the last line of the file has no eol characters */
2056 /* remember eol can be 0 if it's an empty line, but eol_len should not be zero also
2057 * since find_eol returned TRUE
2060 if (!_dbus_string_move_len (source, 0, eol + eol_len, dest, 0))
2063 /* remove line ending */
2064 if (!_dbus_string_set_length (dest, eol))
2066 _dbus_assert_not_reached ("out of memory when shortening a string");
2073 #ifdef DBUS_BUILD_TESTS
2075 * Deletes up to and including the first blank space
2078 * @param str the string
2081 _dbus_string_delete_first_word (DBusString *str)
2085 if (_dbus_string_find_blank (str, 0, &i))
2086 _dbus_string_skip_blank (str, i, &i);
2088 _dbus_string_delete (str, 0, i);
2092 #ifdef DBUS_BUILD_TESTS
2094 * Deletes any leading blanks in the string
2096 * @param str the string
2099 _dbus_string_delete_leading_blanks (DBusString *str)
2103 _dbus_string_skip_blank (str, 0, &i);
2106 _dbus_string_delete (str, 0, i);
2111 * Deletes leading and trailing whitespace
2113 * @param str the string
2116 _dbus_string_chop_white(DBusString *str)
2120 _dbus_string_skip_white (str, 0, &i);
2123 _dbus_string_delete (str, 0, i);
2125 _dbus_string_skip_white_reverse (str, _dbus_string_get_length (str), &i);
2127 _dbus_string_set_length (str, i);
2131 * Tests two DBusString for equality.
2133 * @todo memcmp is probably faster
2135 * @param a first string
2136 * @param b second string
2137 * @returns #TRUE if equal
2140 _dbus_string_equal (const DBusString *a,
2141 const DBusString *b)
2143 const unsigned char *ap;
2144 const unsigned char *bp;
2145 const unsigned char *a_end;
2146 const DBusRealString *real_a = (const DBusRealString*) a;
2147 const DBusRealString *real_b = (const DBusRealString*) b;
2148 DBUS_GENERIC_STRING_PREAMBLE (real_a);
2149 DBUS_GENERIC_STRING_PREAMBLE (real_b);
2151 if (real_a->len != real_b->len)
2156 a_end = real_a->str + real_a->len;
2170 * Tests two DBusString for equality up to the given length.
2171 * The strings may be shorter than the given length.
2173 * @todo write a unit test
2175 * @todo memcmp is probably faster
2177 * @param a first string
2178 * @param b second string
2179 * @param len the maximum length to look at
2180 * @returns #TRUE if equal for the given number of bytes
2183 _dbus_string_equal_len (const DBusString *a,
2184 const DBusString *b,
2187 const unsigned char *ap;
2188 const unsigned char *bp;
2189 const unsigned char *a_end;
2190 const DBusRealString *real_a = (const DBusRealString*) a;
2191 const DBusRealString *real_b = (const DBusRealString*) b;
2192 DBUS_GENERIC_STRING_PREAMBLE (real_a);
2193 DBUS_GENERIC_STRING_PREAMBLE (real_b);
2195 if (real_a->len != real_b->len &&
2196 (real_a->len < len || real_b->len < len))
2201 a_end = real_a->str + MIN (real_a->len, len);
2215 * Tests two sub-parts of two DBusString for equality. The specified
2216 * range of the first string must exist; the specified start position
2217 * of the second string must exist.
2219 * @todo write a unit test
2221 * @todo memcmp is probably faster
2223 * @param a first string
2224 * @param a_start where to start substring in first string
2225 * @param a_len length of substring in first string
2226 * @param b second string
2227 * @param b_start where to start substring in second string
2228 * @returns #TRUE if the two substrings are equal
2231 _dbus_string_equal_substring (const DBusString *a,
2234 const DBusString *b,
2237 const unsigned char *ap;
2238 const unsigned char *bp;
2239 const unsigned char *a_end;
2240 const DBusRealString *real_a = (const DBusRealString*) a;
2241 const DBusRealString *real_b = (const DBusRealString*) b;
2242 DBUS_GENERIC_STRING_PREAMBLE (real_a);
2243 DBUS_GENERIC_STRING_PREAMBLE (real_b);
2244 _dbus_assert (a_start >= 0);
2245 _dbus_assert (a_len >= 0);
2246 _dbus_assert (a_start <= real_a->len);
2247 _dbus_assert (a_len <= real_a->len - a_start);
2248 _dbus_assert (b_start >= 0);
2249 _dbus_assert (b_start <= real_b->len);
2251 if (a_len > real_b->len - b_start)
2254 ap = real_a->str + a_start;
2255 bp = real_b->str + b_start;
2266 _dbus_assert (bp <= (real_b->str + real_b->len));
2272 * Checks whether a string is equal to a C string.
2274 * @param a the string
2275 * @param c_str the C string
2276 * @returns #TRUE if equal
2279 _dbus_string_equal_c_str (const DBusString *a,
2282 const unsigned char *ap;
2283 const unsigned char *bp;
2284 const unsigned char *a_end;
2285 const DBusRealString *real_a = (const DBusRealString*) a;
2286 DBUS_GENERIC_STRING_PREAMBLE (real_a);
2287 _dbus_assert (c_str != NULL);
2290 bp = (const unsigned char*) c_str;
2291 a_end = real_a->str + real_a->len;
2292 while (ap != a_end && *bp)
2301 if (ap != a_end || *bp)
2307 #ifdef DBUS_BUILD_TESTS
2309 * Checks whether a string starts with the given C string.
2311 * @param a the string
2312 * @param c_str the C string
2313 * @returns #TRUE if string starts with it
2316 _dbus_string_starts_with_c_str (const DBusString *a,
2319 const unsigned char *ap;
2320 const unsigned char *bp;
2321 const unsigned char *a_end;
2322 const DBusRealString *real_a = (const DBusRealString*) a;
2323 DBUS_GENERIC_STRING_PREAMBLE (real_a);
2324 _dbus_assert (c_str != NULL);
2327 bp = (const unsigned char*) c_str;
2328 a_end = real_a->str + real_a->len;
2329 while (ap != a_end && *bp)
2343 #endif /* DBUS_BUILD_TESTS */
2346 * Appends a two-character hex digit to a string, where the hex digit
2347 * has the value of the given byte.
2349 * @param str the string
2350 * @param byte the byte
2351 * @returns #FALSE if no memory
2354 _dbus_string_append_byte_as_hex (DBusString *str,
2357 const char hexdigits[16] = {
2358 '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
2359 'a', 'b', 'c', 'd', 'e', 'f'
2362 if (!_dbus_string_append_byte (str,
2363 hexdigits[(byte >> 4)]))
2366 if (!_dbus_string_append_byte (str,
2367 hexdigits[(byte & 0x0f)]))
2369 _dbus_string_set_length (str,
2370 _dbus_string_get_length (str) - 1);
2378 * Encodes a string in hex, the way MD5 and SHA-1 are usually
2379 * encoded. (Each byte is two hex digits.)
2381 * @param source the string to encode
2382 * @param start byte index to start encoding
2383 * @param dest string where encoded data should be placed
2384 * @param insert_at where to place encoded data
2385 * @returns #TRUE if encoding was successful, #FALSE if no memory etc.
2388 _dbus_string_hex_encode (const DBusString *source,
2394 const unsigned char *p;
2395 const unsigned char *end;
2398 _dbus_assert (start <= _dbus_string_get_length (source));
2400 if (!_dbus_string_init (&result))
2405 p = (const unsigned char*) _dbus_string_get_const_data (source);
2406 end = p + _dbus_string_get_length (source);
2411 if (!_dbus_string_append_byte_as_hex (&result, *p))
2417 if (!_dbus_string_move (&result, 0, dest, insert_at))
2423 _dbus_string_free (&result);
2428 * Decodes a string from hex encoding.
2430 * @param source the string to decode
2431 * @param start byte index to start decode
2432 * @param end_return return location of the end of the hex data, or #NULL
2433 * @param dest string where decoded data should be placed
2434 * @param insert_at where to place decoded data
2435 * @returns #TRUE if decoding was successful, #FALSE if no memory.
2438 _dbus_string_hex_decode (const DBusString *source,
2445 const unsigned char *p;
2446 const unsigned char *end;
2448 dbus_bool_t high_bits;
2450 _dbus_assert (start <= _dbus_string_get_length (source));
2452 if (!_dbus_string_init (&result))
2458 p = (const unsigned char*) _dbus_string_get_const_data (source);
2459 end = p + _dbus_string_get_length (source);
2528 if (!_dbus_string_append_byte (&result,
2537 len = _dbus_string_get_length (&result);
2539 b = _dbus_string_get_byte (&result, len - 1);
2543 _dbus_string_set_byte (&result, len - 1, b);
2546 high_bits = !high_bits;
2552 if (!_dbus_string_move (&result, 0, dest, insert_at))
2556 *end_return = p - (const unsigned char*) _dbus_string_get_const_data (source);
2561 _dbus_string_free (&result);
2566 * Checks that the given range of the string is valid ASCII with no
2567 * nul bytes. If the given range is not entirely contained in the
2568 * string, returns #FALSE.
2570 * @todo this is inconsistent with most of DBusString in that
2571 * it allows a start,len range that extends past the string end.
2573 * @param str the string
2574 * @param start first byte index to check
2575 * @param len number of bytes to check
2576 * @returns #TRUE if the byte range exists and is all valid ASCII
2579 _dbus_string_validate_ascii (const DBusString *str,
2583 const unsigned char *s;
2584 const unsigned char *end;
2585 DBUS_CONST_STRING_PREAMBLE (str);
2586 _dbus_assert (start >= 0);
2587 _dbus_assert (start <= real->len);
2588 _dbus_assert (len >= 0);
2590 if (len > real->len - start)
2593 s = real->str + start;
2597 if (_DBUS_UNLIKELY (!_DBUS_ISASCII (*s)))
2607 * Converts the given range of the string to lower case.
2609 * @param str the string
2610 * @param start first byte index to convert
2611 * @param len number of bytes to convert
2614 _dbus_string_tolower_ascii (const DBusString *str,
2620 DBUS_STRING_PREAMBLE (str);
2621 _dbus_assert (start >= 0);
2622 _dbus_assert (start <= real->len);
2623 _dbus_assert (len >= 0);
2624 _dbus_assert (len <= real->len - start);
2626 s = real->str + start;
2631 if (*s >= 'A' && *s <= 'Z')
2638 * Converts the given range of the string to upper case.
2640 * @param str the string
2641 * @param start first byte index to convert
2642 * @param len number of bytes to convert
2645 _dbus_string_toupper_ascii (const DBusString *str,
2651 DBUS_STRING_PREAMBLE (str);
2652 _dbus_assert (start >= 0);
2653 _dbus_assert (start <= real->len);
2654 _dbus_assert (len >= 0);
2655 _dbus_assert (len <= real->len - start);
2657 s = real->str + start;
2662 if (*s >= 'a' && *s <= 'z')
2669 * Checks that the given range of the string is valid UTF-8. If the
2670 * given range is not entirely contained in the string, returns
2671 * #FALSE. If the string contains any nul bytes in the given range,
2672 * returns #FALSE. If the start and start+len are not on character
2673 * boundaries, returns #FALSE.
2675 * @todo this is inconsistent with most of DBusString in that
2676 * it allows a start,len range that extends past the string end.
2678 * @param str the string
2679 * @param start first byte index to check
2680 * @param len number of bytes to check
2681 * @returns #TRUE if the byte range exists and is all valid UTF-8
2684 _dbus_string_validate_utf8 (const DBusString *str,
2688 const unsigned char *p;
2689 const unsigned char *end;
2690 DBUS_CONST_STRING_PREAMBLE (str);
2691 _dbus_assert (start >= 0);
2692 _dbus_assert (start <= real->len);
2693 _dbus_assert (len >= 0);
2695 /* we are doing _DBUS_UNLIKELY() here which might be
2696 * dubious in a generic library like GLib, but in D-Bus
2697 * we know we're validating messages and that it would
2698 * only be evil/broken apps that would have invalid
2699 * UTF-8. Also, this function seems to be a performance
2700 * bottleneck in profiles.
2703 if (_DBUS_UNLIKELY (len > real->len - start))
2706 p = real->str + start;
2711 int i, mask, char_len;
2712 dbus_unichar_t result;
2714 /* nul bytes considered invalid */
2718 /* Special-case ASCII; this makes us go a lot faster in
2719 * D-Bus profiles where we are typically validating
2720 * function names and such. We have to know that
2721 * all following checks will pass for ASCII though,
2722 * comments follow ...
2730 UTF8_COMPUTE (*p, mask, char_len);
2732 if (_DBUS_UNLIKELY (char_len == 0)) /* ASCII: char_len == 1 */
2735 /* check that the expected number of bytes exists in the remaining length */
2736 if (_DBUS_UNLIKELY ((end - p) < char_len)) /* ASCII: p < end and char_len == 1 */
2739 UTF8_GET (result, p, i, mask, char_len);
2741 /* Check for overlong UTF-8 */
2742 if (_DBUS_UNLIKELY (UTF8_LENGTH (result) != char_len)) /* ASCII: UTF8_LENGTH == 1 */
2745 /* The UNICODE_VALID check below will catch this */
2746 if (_DBUS_UNLIKELY (result == (dbus_unichar_t)-1)) /* ASCII: result = ascii value */
2750 if (_DBUS_UNLIKELY (!UNICODE_VALID (result))) /* ASCII: always valid */
2753 /* UNICODE_VALID should have caught it */
2754 _dbus_assert (result != (dbus_unichar_t)-1);
2759 /* See that we covered the entire length if a length was
2762 if (_DBUS_UNLIKELY (p != end))
2769 * Checks that the given range of the string is all nul bytes. If the
2770 * given range is not entirely contained in the string, returns
2773 * @todo this is inconsistent with most of DBusString in that
2774 * it allows a start,len range that extends past the string end.
2776 * @param str the string
2777 * @param start first byte index to check
2778 * @param len number of bytes to check
2779 * @returns #TRUE if the byte range exists and is all nul bytes
2782 _dbus_string_validate_nul (const DBusString *str,
2786 const unsigned char *s;
2787 const unsigned char *end;
2788 DBUS_CONST_STRING_PREAMBLE (str);
2789 _dbus_assert (start >= 0);
2790 _dbus_assert (len >= 0);
2791 _dbus_assert (start <= real->len);
2793 if (len > real->len - start)
2796 s = real->str + start;
2800 if (_DBUS_UNLIKELY (*s != '\0'))
2809 * Clears all allocated bytes in the string to zero.
2811 * @param str the string
2814 _dbus_string_zero (DBusString *str)
2816 DBUS_STRING_PREAMBLE (str);
2818 memset (real->str - real->align_offset, '\0', real->allocated);
2822 /* tests are in dbus-string-util.c */