1 /* Copyright (C) 2004 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
3 /** \file string.c Memory allocation and string handling functions. */
8 #include <sys/utsname.h> /* uname() */
18 * Paraslash's version of realloc().
20 * \param p Pointer to the memory block, may be \p NULL.
21 * \param size The desired new size.
23 * A wrapper for realloc(3). It calls \p exit(\p EXIT_FAILURE) on errors,
24 * i.e. there is no need to check the return value in the caller.
26 * \return A pointer to newly allocated memory which is suitably aligned for
27 * any kind of variable and may be different from \a p.
31 __must_check void *para_realloc(void *p, size_t size)
34 * No need to check for NULL pointers: If p is NULL, the call
35 * to realloc is equivalent to malloc(size)
38 if (!(p = realloc(p, size))) {
39 PARA_EMERG_LOG("realloc failed (size = %zu), aborting\n",
47 * Paraslash's version of malloc().
49 * \param size The desired new size.
51 * A wrapper for malloc(3) which exits on errors.
53 * \return A pointer to the allocated memory, which is suitably aligned for any
58 __must_check __malloc void *alloc(size_t size)
65 PARA_EMERG_LOG("malloc failed (size = %zu), aborting\n",
73 * Paraslash's version of calloc().
75 * \param size The desired new size.
77 * A wrapper for calloc(3) which exits on errors.
79 * \return A pointer to the allocated and zeroed-out memory, which is suitably
80 * aligned for any kind of variable.
84 __must_check __malloc void *para_calloc(size_t size)
86 void *ret = alloc(size);
93 * Paraslash's version of strdup().
95 * \param s The string to be duplicated.
97 * A strdup(3)-like function which aborts if insufficient memory was available
98 * to allocate the duplicated string, absolving the caller from the
99 * responsibility to check for failure.
101 * \return A pointer to the duplicated string. Unlike strdup(3), the caller may
102 * pass NULL, in which case the function returns a pointer to an empty string.
103 * Regardless of whether or not NULL was passed, the returned string is
104 * allocated on the heap and has to be freed by the caller.
108 __must_check __malloc char *para_strdup(const char *s)
110 char *dupped_string = strdup(s? s: "");
112 assert(dupped_string);
113 return dupped_string;
117 * Print a formatted message to a dynamically allocated string.
119 * \param result The formatted string is returned here.
120 * \param fmt The format string.
121 * \param ap Initialized list of arguments.
123 * This function is similar to vasprintf(), a GNU extension which is not in C
124 * or POSIX. It allocates a string large enough to hold the output including
125 * the terminating null byte. The allocated string is returned via the first
126 * argument and must be freed by the caller. However, unlike vasprintf(), this
127 * function calls exit() if insufficient memory is available, while vasprintf()
128 * returns -1 in this case.
130 * \return Number of bytes written, not including the terminating \p NULL
133 * \sa printf(3), vsnprintf(3), va_start(3), vasprintf(3), \ref xasprintf().
135 __printf_2_0 unsigned xvasprintf(char **result, const char *fmt, va_list ap)
141 *result = alloc(size + 1);
143 ret = vsnprintf(*result, size, fmt, aq);
146 if (ret < size) /* OK */
149 *result = para_realloc(*result, size);
151 ret = vsnprintf(*result, size, fmt, aq);
153 assert(ret >= 0 && ret < size);
158 * Print to a dynamically allocated string, variable number of arguments.
160 * \param result See \ref xvasprintf().
161 * \param fmt Usual format string.
163 * \return The return value of the underlying call to \ref xvasprintf().
165 * \sa \ref xvasprintf() and the references mentioned there.
167 __printf_2_3 unsigned xasprintf(char **result, const char *fmt, ...)
173 ret = xvasprintf(result, fmt, ap);
179 * Allocate a sufficiently large string and print into it.
181 * \param fmt A usual format string.
183 * Produce output according to \p fmt. No artificial bound on the length of the
184 * resulting string is imposed.
186 * \return This function either returns a pointer to a string that must be
187 * freed by the caller or aborts without returning.
189 * \sa printf(3), \ref xasprintf().
191 __must_check __printf_1_2 __malloc char *make_message(const char *fmt, ...)
197 xvasprintf(&msg, fmt, ap);
203 * Free the content of a pointer and set it to NULL.
205 * \param arg A pointer to the pointer whose content should be freed.
207 * If arg is NULL, the function returns immediately. Otherwise it frees the
208 * memory pointed to by *arg and sets *arg to NULL. Hence callers have to pass
209 * the *address* of the pointer variable that points to the memory which should
212 void freep(void *arg)
222 * Paraslash's version of strcat().
224 * \param a String to be appended to.
225 * \param b String to append.
227 * Append \p b to \p a.
229 * \return If \a a is \p NULL, return a pointer to a copy of \a b, i.e.
230 * para_strcat(NULL, b) is equivalent to para_strdup(b). If \a b is \p NULL,
231 * return \a a without making a copy of \a a. Otherwise, construct the
232 * concatenation \a c, free \a a (but not \a b) and return \a c.
236 __must_check __malloc char *para_strcat(char *a, const char *b)
241 return para_strdup(b);
244 tmp = make_message("%s%s", a, b);
250 * Get the logname of the current user.
252 * \return A dynamically allocated string that must be freed by the caller. On
253 * errors, the string "unknown_user" is returned, i.e. this function never
258 __must_check __malloc char *para_logname(void)
260 struct passwd *pw = getpwuid(getuid());
261 return para_strdup(pw? pw->pw_name : "unknown_user");
265 * Get the home directory of the current user.
267 * \return A dynamically allocated string that must be freed by the caller. If
268 * the home directory could not be found, this function returns "/tmp".
270 __must_check __malloc char *para_homedir(void)
272 struct passwd *pw = getpwuid(getuid());
273 return para_strdup(pw? pw->pw_dir : "/tmp");
277 * Get the own hostname.
279 * \return A dynamically allocated string containing the hostname.
283 __malloc char *para_hostname(void)
288 return para_strdup(u.nodename);
292 * Call a custom function for each complete line.
294 * \param flags Any combination of flags defined in \ref for_each_line_flags.
295 * \param buf The buffer containing data separated by newlines.
296 * \param size The number of bytes in \a buf.
297 * \param line_handler The custom function.
298 * \param private_data Pointer passed to \a line_handler.
300 * For each complete line in \p buf, \p line_handler is called. The first
301 * argument to \p line_handler is (a copy of) the current line, and \p
302 * private_data is passed as the second argument. If the \p FELF_READ_ONLY
303 * flag is unset, a pointer into \a buf is passed to the line handler,
304 * otherwise a pointer to a copy of the current line is passed instead. This
305 * copy is freed immediately after the line handler returns.
307 * The function returns if \p line_handler returns a negative value or no more
308 * lines are in the buffer. The rest of the buffer (last chunk containing an
309 * incomplete line) is moved to the beginning of the buffer if FELF_READ_ONLY is
312 * \return On success this function returns the number of bytes not handled to
313 * \p line_handler. The only possible error is a negative return value from the
314 * line handler. In this case processing stops and the return value of the line
315 * handler is returned to indicate failure.
317 * \sa \ref for_each_line_flags.
319 int for_each_line(unsigned flags, char *buf, size_t size,
320 line_handler_t *line_handler, void *private_data)
322 char *start = buf, *end;
323 int ret, i, num_lines = 0;
325 // PARA_NOTICE_LOG("buf: %s\n", buf);
326 while (start < buf + size) {
330 next_cr = memchr(start, '\n', buf + size - start);
331 next_null = memchr(start, '\0', next_cr?
332 next_cr - start : buf + size - start);
333 if (!next_cr && !next_null)
340 if (!(flags & FELF_DISCARD_FIRST) || start != buf) {
341 if (flags & FELF_READ_ONLY) {
342 size_t s = end - start;
343 char *b = alloc(s + 1);
346 ret = line_handler(b, private_data);
350 ret = line_handler(start, private_data);
357 i = buf + size - start;
358 if (i && i != size && !(flags & FELF_READ_ONLY))
359 memmove(buf, start, i);
363 /** Return the hex characters of the lower 4 bits. */
364 #define hex(a) (hexchar[(a) & 15])
366 static void write_size_header(char *buf, int n)
368 static char hexchar[] = "0123456789abcdef";
370 buf[0] = hex(n >> 12);
371 buf[1] = hex(n >> 8);
372 buf[2] = hex(n >> 4);
378 * Read a four-byte hex-number and return its value.
380 * Each status item sent by para_server is prefixed with such a hex number in
381 * ASCII which describes the size of the status item.
383 * \param buf The buffer which must be at least four bytes long.
385 * \return The value of the hex number on success, \p -E_SIZE_PREFIX if the
386 * buffer did not contain only hex digits.
388 int read_size_header(const char *buf)
392 for (i = 0; i < 4; i++) {
393 unsigned char c = buf[i];
395 if (c >= '0' && c <= '9') {
399 if (c >= 'a' && c <= 'f') {
403 return -E_SIZE_PREFIX;
406 return -E_SIZE_PREFIX;
411 * Safely print into a buffer at a given offset.
413 * \param b Determines the buffer, its size, and the offset.
414 * \param fmt The format string.
416 * This function prints into the buffer given by \a b at the offset which is
417 * also given by \a b. If there is not enough space to hold the result, the
418 * buffer size is doubled until the underlying call to vsnprintf() succeeds
419 * or the size of the buffer exceeds the maximal size specified in \a b.
421 * In the latter case the unmodified \a buf and \a offset values as well as the
422 * private_data pointer of \a b are passed to the \a max_size_handler of \a b.
423 * If this function succeeds, i.e. returns a non-negative value, the offset of
424 * \a b is reset to zero and the given data is written to the beginning of the
425 * buffer. If \a max_size_handler() returns a negative value, this value is
426 * returned by \a para_printf().
428 * Upon return, the offset of \a b is adjusted accordingly so that subsequent
429 * calls to this function append data to what is already contained in the
432 * It's OK to call this function with \p b->buf being \p NULL. In this case, an
433 * initial buffer is allocated.
435 * \return The number of bytes printed into the buffer (not including the
436 * terminating \p NULL byte) on success, negative on errors. If there is no
437 * size-bound on \a b, i.e. if \p b->max_size is zero, this function never
440 * \sa make_message(), vsnprintf(3).
442 __printf_2_3 int para_printf(struct para_buffer *b, const char *fmt, ...)
444 int ret, sz_off = (b->flags & PBF_SIZE_PREFIX)? 5 : 0;
452 char *p = b->buf + b->offset;
453 size_t size = b->size - b->offset;
458 ret = vsnprintf(p + sz_off, size - sz_off, fmt, ap);
460 if (ret > -1 && ret < size - sz_off) { /* success */
461 b->offset += ret + sz_off;
463 write_size_header(p, ret);
467 /* check if we may grow the buffer */
468 if (!b->max_size || 2 * b->size < b->max_size) { /* yes */
469 /* try again with more space */
471 b->buf = para_realloc(b->buf, b->size);
474 /* can't grow buffer */
475 if (!b->offset || !b->max_size_handler) /* message too large */
476 return -ERRNO_TO_PARA_ERROR(ENOSPC);
477 ret = b->max_size_handler(b->buf, b->offset, b->private_data);
484 /** \cond llong_minmax */
485 /* LLONG_MAX and LLONG_MIN might not be defined. */
487 #define LLONG_MAX 9223372036854775807LL
490 #define LLONG_MIN (-LLONG_MAX - 1LL)
492 /** \endcond llong_minmax */
495 * Convert a string to a 64-bit signed integer value.
497 * \param str The string to be converted.
498 * \param value Result pointer.
502 * \sa \ref para_atoi32(), strtol(3), atoi(3).
504 int para_atoi64(const char *str, int64_t *value)
509 errno = 0; /* To distinguish success/failure after call */
510 tmp = strtoll(str, &endptr, 10);
511 if (errno == ERANGE && (tmp == LLONG_MAX || tmp == LLONG_MIN))
512 return -E_ATOI_OVERFLOW;
514 * If there were no digits at all, strtoll() stores the original value
518 return -E_ATOI_NO_DIGITS;
520 * The implementation may also set errno and return 0 in case no
521 * conversion was performed.
523 if (errno != 0 && tmp == 0)
524 return -E_ATOI_NO_DIGITS;
525 if (*endptr != '\0') /* Further characters after number */
526 return -E_ATOI_JUNK_AT_END;
532 * Convert a string to a 32-bit signed integer value.
534 * \param str The string to be converted.
535 * \param value Result pointer.
539 * \sa \ref para_atoi64().
541 int para_atoi32(const char *str, int32_t *value)
545 const int32_t max = 2147483647;
547 ret = para_atoi64(str, &tmp);
550 if (tmp > max || tmp < -max - 1)
551 return -E_ATOI_OVERFLOW;
556 static inline int loglevel_equal(const char *arg, const char * const ll)
558 return !strncasecmp(arg, ll, strlen(ll));
562 * Compute the loglevel number from its name.
564 * \param txt The name of the loglevel (debug, info, ...).
566 * \return The numeric representation of the loglevel name.
568 int get_loglevel_by_name(const char *txt)
570 if (loglevel_equal(txt, "debug"))
572 if (loglevel_equal(txt, "info"))
574 if (loglevel_equal(txt, "notice"))
576 if (loglevel_equal(txt, "warning"))
578 if (loglevel_equal(txt, "error"))
580 if (loglevel_equal(txt, "crit"))
582 if (loglevel_equal(txt, "emerg"))
587 static int get_next_word(const char *buf, const char *delim, char **word)
589 enum line_state_flags {LSF_HAVE_WORD = 1, LSF_BACKSLASH = 2,
590 LSF_SINGLE_QUOTE = 4, LSF_DOUBLE_QUOTE = 8};
595 out = alloc(strlen(buf) + 1);
598 for (in = buf; *in; in++) {
603 if (state & LSF_BACKSLASH) /* \\ */
605 state |= LSF_BACKSLASH;
606 state |= LSF_HAVE_WORD;
610 if (state & LSF_BACKSLASH) { /* \n or \t */
611 *out++ = (*in == 'n')? '\n' : '\t';
612 state &= ~LSF_BACKSLASH;
617 if (state & LSF_BACKSLASH) /* \" */
619 if (state & LSF_SINGLE_QUOTE) /* '" */
621 if (state & LSF_DOUBLE_QUOTE) {
622 state &= ~LSF_DOUBLE_QUOTE;
625 state |= LSF_HAVE_WORD;
626 state |= LSF_DOUBLE_QUOTE;
629 if (state & LSF_BACKSLASH) /* \' */
631 if (state & LSF_DOUBLE_QUOTE) /* "' */
633 if (state & LSF_SINGLE_QUOTE) {
634 state &= ~LSF_SINGLE_QUOTE;
637 state |= LSF_HAVE_WORD;
638 state |= LSF_SINGLE_QUOTE;
641 for (p = delim; *p; p++) {
644 if (state & LSF_BACKSLASH)
646 if (state & LSF_SINGLE_QUOTE)
648 if (state & LSF_DOUBLE_QUOTE)
650 if (state & LSF_HAVE_WORD)
654 if (*p) /* ignore delimiter at the beginning */
657 state |= LSF_HAVE_WORD;
659 state &= ~LSF_BACKSLASH;
662 if (!(state & LSF_HAVE_WORD))
664 ret = -ERRNO_TO_PARA_ERROR(EINVAL);
665 if (state & LSF_BACKSLASH) {
666 PARA_ERROR_LOG("trailing backslash\n");
669 if ((state & LSF_SINGLE_QUOTE) || (state & LSF_DOUBLE_QUOTE)) {
670 PARA_ERROR_LOG("unmatched quote character\n");
683 * Get the number of the word the cursor is on.
685 * \param buf The zero-terminated line buffer.
686 * \param delim Characters that separate words.
687 * \param point The cursor position.
689 * \return Zero-based word number.
691 int compute_word_num(const char *buf, const char *delim, int point)
697 for (p = buf, num_words = 0; ; p += ret, num_words++) {
698 ret = get_next_word(p, delim, &word);
702 if (p + ret >= buf + point)
709 * Free an array of words created by create_argv() or create_shifted_argv().
711 * \param argv A pointer previously obtained by \ref create_argv().
713 void free_argv(char **argv)
719 for (i = 0; argv[i]; i++)
724 static int create_argv_offset(int offset, const char *buf, const char *delim,
727 char *word, **argv = alloc((offset + 1) * sizeof(char *));
731 for (i = 0; i < offset; i++)
733 for (p = buf; p && *p; p += ret, i++) {
734 ret = get_next_word(p, delim, &word);
739 argv = para_realloc(argv, (i + 2) * sizeof(char*));
754 * Split a buffer into words.
756 * This parser honors single and double quotes, backslash-escaped characters
757 * and special characters like \\n. The result contains pointers to copies of
758 * the words contained in buf and has to be freed by using \ref free_argv().
760 * \param buf The buffer to be split.
761 * \param delim Each character in this string is treated as a separator.
762 * \param result The array of words is returned here.
764 * It's OK to pass NULL as the buffer argument. This is equivalent to passing
767 * \return Number of words in buf, negative on errors. The array returned
768 * through the result pointer is NULL terminated.
770 int create_argv(const char *buf, const char *delim, char ***result)
772 return create_argv_offset(0, buf, delim, result);
776 * Split a buffer into words, offset one.
778 * This is similar to \ref create_argv() but the returned array is one element
779 * larger, words start at index one and element zero is initialized to \p NULL.
780 * Callers must set element zero to a non-NULL value before calling free_argv()
781 * on the returned array to avoid a memory leak.
783 * \param buf See \ref create_argv().
784 * \param delim See \ref create_argv().
785 * \param result See \ref create_argv().
787 * \return Number of words plus one on success, negative on errors.
789 int create_shifted_argv(const char *buf, const char *delim, char ***result)
791 return create_argv_offset(1, buf, delim, result);
795 * Find out if the given string is contained in the arg vector.
797 * \param arg The string to look for.
798 * \param argv The array to search.
800 * \return The first index whose value equals \a arg, or \p -E_ARG_NOT_FOUND if
801 * arg was not found in \a argv.
803 int find_arg(const char *arg, char **argv)
808 return -E_ARG_NOT_FOUND;
809 for (i = 0; argv[i]; i++)
810 if (strcmp(arg, argv[i]) == 0)
812 return -E_ARG_NOT_FOUND;
816 * Compile a regular expression.
818 * This simple wrapper calls regcomp() and logs a message on errors.
820 * \param preg See regcomp(3).
821 * \param regex See regcomp(3).
822 * \param cflags See regcomp(3).
826 int para_regcomp(regex_t *preg, const char *regex, int cflags)
830 int ret = regcomp(preg, regex, cflags);
834 size = regerror(ret, preg, NULL, 0);
836 regerror(ret, preg, buf, size);
837 PARA_ERROR_LOG("%s\n", buf);
843 * strdup() for not necessarily zero-terminated strings.
845 * \param src The source buffer.
846 * \param len The number of bytes to be copied.
848 * \return A 0-terminated buffer of length \a len + 1.
850 * This is similar to strndup(), which is a GNU extension. However, one
851 * difference is that strndup() returns \p NULL if insufficient memory was
852 * available while this function aborts in this case.
854 * \sa strdup(), \ref para_strdup().
856 char *safe_strdup(const char *src, size_t len)
860 assert(len < (size_t)-1);
869 * Copy the value of a key=value pair.
871 * This checks whether the given buffer starts with "key=", ignoring case. If
872 * yes, a copy of the value is returned. The source buffer may not be
875 * \param src The source buffer.
876 * \param len The number of bytes of the tag.
877 * \param key Only copy if it is the value of this key.
879 * \return A zero-terminated buffer, or \p NULL if the key was
880 * not of the given type.
882 char *key_value_copy(const char *src, size_t len, const char *key)
884 int keylen = strlen(key);
888 if (strncasecmp(src, key, keylen))
890 if (src[keylen] != '=')
892 return safe_strdup(src + keylen + 1, len - keylen - 1);
895 static bool utf8_mode(void)
897 static bool initialized, have_utf8;
900 char *info = nl_langinfo(CODESET);
901 have_utf8 = (info && strcmp(info, "UTF-8") == 0);
903 PARA_INFO_LOG("%susing UTF-8 character encoding\n",
904 have_utf8? "" : "not ");
909 static int xwcwidth(wchar_t wc, size_t pos)
913 /* special-case for tab */
914 if (wc == 0x09) /* tab */
915 return (pos | 7) + 1 - pos;
917 /* wcswidth() returns -1 for non-printable characters */
918 return n >= 0? n : 1;
921 static size_t xwcswidth(const wchar_t *s, size_t n)
926 w += xwcwidth(*s++, w);
931 * Skip a given number of cells at the beginning of a string.
933 * \param s The input string.
934 * \param cells_to_skip Desired number of cells that should be skipped.
935 * \param bytes_to_skip Result.
937 * This function computes how many input bytes must be skipped to advance a
938 * string by the given width. If the current character encoding is not UTF-8,
939 * this is simply the given number of cells, i.e. \a cells_to_skip. Otherwise,
940 * \a s is treated as a multibyte string and on successful return, \a s +
941 * bytes_to_skip points to the start of a multibyte string such that the total
942 * width of the multibyte characters that are skipped by advancing \a s that
943 * many bytes equals at least \a cells_to_skip.
947 int skip_cells(const char *s, size_t cells_to_skip, size_t *bytes_to_skip)
951 size_t n, bytes_parsed, cells_skipped;
954 if (cells_to_skip == 0)
957 *bytes_to_skip = cells_to_skip;
960 bytes_parsed = cells_skipped = 0;
961 memset(&ps, 0, sizeof(ps));
963 while (cells_to_skip > cells_skipped) {
966 mbret = mbrtowc(&wc, s + bytes_parsed, n - bytes_parsed, &ps);
968 if (mbret == (size_t)-1 || mbret == (size_t)-2)
969 return -ERRNO_TO_PARA_ERROR(EILSEQ);
970 bytes_parsed += mbret;
971 cells_skipped += xwcwidth(wc, cells_skipped);
973 *bytes_to_skip = bytes_parsed;
978 * Compute the width of an UTF-8 string.
980 * \param s The string.
981 * \param result The width of \a s is returned here.
983 * If not in UTF8-mode. this function is just a wrapper for strlen(3).
984 * Otherwise \a s is treated as an UTF-8 string and its display width is
985 * computed. Note that this function may fail if the underlying call to
986 * mbsrtowcs(3) fails, so the caller must check the return value.
988 * \sa nl_langinfo(3), wcswidth(3).
992 __must_check int strwidth(const char *s, size_t *result)
996 static wchar_t *dest;
1000 * Never call any log function here. This may result in an endless loop
1001 * as para_gui's para_log() calls this function.
1005 *result = strlen(s);
1008 memset(&state, 0, sizeof(state));
1010 num_wchars = mbsrtowcs(NULL, &src, 0, &state);
1011 if (num_wchars == (size_t)-1)
1012 return -ERRNO_TO_PARA_ERROR(errno);
1013 if (num_wchars == 0)
1015 dest = alloc((num_wchars + 1) * sizeof(*dest));
1017 memset(&state, 0, sizeof(state));
1018 num_wchars = mbsrtowcs(dest, &src, num_wchars, &state);
1019 assert(num_wchars > 0 && num_wchars != (size_t)-1);
1020 *result = xwcswidth(dest, num_wchars);
1026 * Truncate and sanitize a (wide character) string.
1028 * This replaces all non-printable characters by spaces and makes sure that the
1029 * modified string does not exceed the given maximal width.
1031 * \param src The source string in multi-byte form.
1032 * \param max_width The maximal number of cells the result may occupy.
1033 * \param result Sanitized multi-byte string, must be freed by caller.
1034 * \param width The width of the sanitized string, always <= max_width.
1036 * The function is wide-character aware but falls back to C strings for
1037 * non-UTF-8 locales.
1039 * \return Standard. On success, *result points to a sanitized copy of the
1040 * given string. This copy was allocated with malloc() and should hence be
1041 * freed when the caller is no longer interested in the result.
1043 * The function fails if the given string contains an invalid multibyte
1044 * sequence. In this case, *result is set to NULL, and *width to zero.
1046 __must_check int sanitize_str(const char *src, size_t max_width,
1047 char **result, size_t *width)
1050 static wchar_t *wcs;
1051 size_t num_wchars, n;
1054 *result = para_strdup(src);
1055 /* replace non-printable characters by spaces */
1056 for (n = 0; n < max_width && src[n]; n++) {
1057 if (!isprint((unsigned char)src[n]))
1060 (*result)[n] = '\0';
1066 memset(&state, 0, sizeof(state));
1067 num_wchars = mbsrtowcs(NULL, &src, 0, &state);
1068 if (num_wchars == (size_t)-1)
1069 return -ERRNO_TO_PARA_ERROR(errno);
1070 wcs = alloc((num_wchars + 1) * sizeof(*wcs));
1071 memset(&state, 0, sizeof(state));
1072 num_wchars = mbsrtowcs(wcs, &src, num_wchars + 1, &state);
1073 assert(num_wchars != (size_t)-1);
1074 for (n = 0; n < num_wchars && *width < max_width; n++) {
1075 if (!iswprint(wcs[n]))
1077 *width += xwcwidth(wcs[n], *width);
1080 n = wcstombs(NULL, wcs, 0) + 1;
1082 num_wchars = wcstombs(*result, wcs, n);
1083 assert(num_wchars != (size_t)-1);