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 *para_malloc(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 = para_malloc(size);
93 * Paraslash's version of strdup().
95 * \param s The string to be duplicated.
97 * A wrapper for strdup(3). It calls \p exit(EXIT_FAILURE) on errors, i.e.
98 * there is no need to check the return value in the caller.
100 * \return A pointer to the duplicated string. If \a s was the \p NULL pointer,
101 * an pointer to an empty string is returned.
105 __must_check __malloc char *para_strdup(const char *s)
109 if ((ret = strdup(s? s: "")))
111 PARA_EMERG_LOG("strdup failed, aborting\n");
116 * Print a formatted message to a dynamically allocated string.
118 * \param result The formatted string is returned here.
119 * \param fmt The format string.
120 * \param ap Initialized list of arguments.
122 * This function is similar to vasprintf(), a GNU extension which is not in C
123 * or POSIX. It allocates a string large enough to hold the output including
124 * the terminating null byte. The allocated string is returned via the first
125 * argument and must be freed by the caller. However, unlike vasprintf(), this
126 * function calls exit() if insufficient memory is available, while vasprintf()
127 * returns -1 in this case.
129 * \return Number of bytes written, not including the terminating \p NULL
132 * \sa printf(3), vsnprintf(3), va_start(3), vasprintf(3), \ref xasprintf().
134 __printf_2_0 unsigned xvasprintf(char **result, const char *fmt, va_list ap)
140 *result = para_malloc(size + 1);
142 ret = vsnprintf(*result, size, fmt, aq);
145 if (ret < size) /* OK */
148 *result = para_realloc(*result, size);
150 ret = vsnprintf(*result, size, fmt, aq);
152 assert(ret >= 0 && ret < size);
157 * Print to a dynamically allocated string, variable number of arguments.
159 * \param result See \ref xvasprintf().
160 * \param fmt Usual format string.
162 * \return The return value of the underlying call to \ref xvasprintf().
164 * \sa \ref xvasprintf() and the references mentioned there.
166 __printf_2_3 unsigned xasprintf(char **result, const char *fmt, ...)
172 ret = xvasprintf(result, fmt, ap);
178 * Allocate a sufficiently large string and print into it.
180 * \param fmt A usual format string.
182 * Produce output according to \p fmt. No artificial bound on the length of the
183 * resulting string is imposed.
185 * \return This function either returns a pointer to a string that must be
186 * freed by the caller or aborts without returning.
188 * \sa printf(3), \ref xasprintf().
190 __must_check __printf_1_2 __malloc char *make_message(const char *fmt, ...)
196 xvasprintf(&msg, fmt, ap);
202 * Free the content of a pointer and set it to NULL.
204 * \param arg A pointer to the pointer whose content should be freed.
206 * If arg is NULL, the function returns immediately. Otherwise it frees the
207 * memory pointed to by *arg and sets *arg to NULL. Hence callers have to pass
208 * the *address* of the pointer variable that points to the memory which should
211 void freep(void *arg)
221 * Paraslash's version of strcat().
223 * \param a String to be appended to.
224 * \param b String to append.
226 * Append \p b to \p a.
228 * \return If \a a is \p NULL, return a pointer to a copy of \a b, i.e.
229 * para_strcat(NULL, b) is equivalent to para_strdup(b). If \a b is \p NULL,
230 * return \a a without making a copy of \a a. Otherwise, construct the
231 * concatenation \a c, free \a a (but not \a b) and return \a c.
235 __must_check __malloc char *para_strcat(char *a, const char *b)
240 return para_strdup(b);
243 tmp = make_message("%s%s", a, b);
249 * Get the logname of the current user.
251 * \return A dynamically allocated string that must be freed by the caller. On
252 * errors, the string "unknown_user" is returned, i.e. this function never
257 __must_check __malloc char *para_logname(void)
259 struct passwd *pw = getpwuid(getuid());
260 return para_strdup(pw? pw->pw_name : "unknown_user");
264 * Get the home directory of the current user.
266 * \return A dynamically allocated string that must be freed by the caller. If
267 * the home directory could not be found, this function returns "/tmp".
269 __must_check __malloc char *para_homedir(void)
271 struct passwd *pw = getpwuid(getuid());
272 return para_strdup(pw? pw->pw_dir : "/tmp");
276 * Get the own hostname.
278 * \return A dynamically allocated string containing the hostname.
282 __malloc char *para_hostname(void)
287 return para_strdup(u.nodename);
291 * Call a custom function for each complete line.
293 * \param flags Any combination of flags defined in \ref for_each_line_flags.
294 * \param buf The buffer containing data separated by newlines.
295 * \param size The number of bytes in \a buf.
296 * \param line_handler The custom function.
297 * \param private_data Pointer passed to \a line_handler.
299 * For each complete line in \p buf, \p line_handler is called. The first
300 * argument to \p line_handler is (a copy of) the current line, and \p
301 * private_data is passed as the second argument. If the \p FELF_READ_ONLY
302 * flag is unset, a pointer into \a buf is passed to the line handler,
303 * otherwise a pointer to a copy of the current line is passed instead. This
304 * copy is freed immediately after the line handler returns.
306 * The function returns if \p line_handler returns a negative value or no more
307 * lines are in the buffer. The rest of the buffer (last chunk containing an
308 * incomplete line) is moved to the beginning of the buffer if FELF_READ_ONLY is
311 * \return On success this function returns the number of bytes not handled to
312 * \p line_handler. The only possible error is a negative return value from the
313 * line handler. In this case processing stops and the return value of the line
314 * handler is returned to indicate failure.
316 * \sa \ref for_each_line_flags.
318 int for_each_line(unsigned flags, char *buf, size_t size,
319 line_handler_t *line_handler, void *private_data)
321 char *start = buf, *end;
322 int ret, i, num_lines = 0;
324 // PARA_NOTICE_LOG("buf: %s\n", buf);
325 while (start < buf + size) {
329 next_cr = memchr(start, '\n', buf + size - start);
330 next_null = memchr(start, '\0', next_cr?
331 next_cr - start : buf + size - start);
332 if (!next_cr && !next_null)
339 if (!(flags & FELF_DISCARD_FIRST) || start != buf) {
340 if (flags & FELF_READ_ONLY) {
341 size_t s = end - start;
342 char *b = para_malloc(s + 1);
345 ret = line_handler(b, private_data);
349 ret = line_handler(start, private_data);
356 i = buf + size - start;
357 if (i && i != size && !(flags & FELF_READ_ONLY))
358 memmove(buf, start, i);
362 /** Return the hex characters of the lower 4 bits. */
363 #define hex(a) (hexchar[(a) & 15])
365 static void write_size_header(char *buf, int n)
367 static char hexchar[] = "0123456789abcdef";
369 buf[0] = hex(n >> 12);
370 buf[1] = hex(n >> 8);
371 buf[2] = hex(n >> 4);
377 * Read a four-byte hex-number and return its value.
379 * Each status item sent by para_server is prefixed with such a hex number in
380 * ASCII which describes the size of the status item.
382 * \param buf The buffer which must be at least four bytes long.
384 * \return The value of the hex number on success, \p -E_SIZE_PREFIX if the
385 * buffer did not contain only hex digits.
387 int read_size_header(const char *buf)
391 for (i = 0; i < 4; i++) {
392 unsigned char c = buf[i];
394 if (c >= '0' && c <= '9') {
398 if (c >= 'a' && c <= 'f') {
402 return -E_SIZE_PREFIX;
405 return -E_SIZE_PREFIX;
410 * Safely print into a buffer at a given offset.
412 * \param b Determines the buffer, its size, and the offset.
413 * \param fmt The format string.
415 * This function prints into the buffer given by \a b at the offset which is
416 * also given by \a b. If there is not enough space to hold the result, the
417 * buffer size is doubled until the underlying call to vsnprintf() succeeds
418 * or the size of the buffer exceeds the maximal size specified in \a b.
420 * In the latter case the unmodified \a buf and \a offset values as well as the
421 * private_data pointer of \a b are passed to the \a max_size_handler of \a b.
422 * If this function succeeds, i.e. returns a non-negative value, the offset of
423 * \a b is reset to zero and the given data is written to the beginning of the
424 * buffer. If \a max_size_handler() returns a negative value, this value is
425 * returned by \a para_printf().
427 * Upon return, the offset of \a b is adjusted accordingly so that subsequent
428 * calls to this function append data to what is already contained in the
431 * It's OK to call this function with \p b->buf being \p NULL. In this case, an
432 * initial buffer is allocated.
434 * \return The number of bytes printed into the buffer (not including the
435 * terminating \p NULL byte) on success, negative on errors. If there is no
436 * size-bound on \a b, i.e. if \p b->max_size is zero, this function never
439 * \sa make_message(), vsnprintf(3).
441 __printf_2_3 int para_printf(struct para_buffer *b, const char *fmt, ...)
443 int ret, sz_off = (b->flags & PBF_SIZE_PREFIX)? 5 : 0;
446 b->buf = para_malloc(128);
451 char *p = b->buf + b->offset;
452 size_t size = b->size - b->offset;
457 ret = vsnprintf(p + sz_off, size - sz_off, fmt, ap);
459 if (ret > -1 && ret < size - sz_off) { /* success */
460 b->offset += ret + sz_off;
462 write_size_header(p, ret);
466 /* check if we may grow the buffer */
467 if (!b->max_size || 2 * b->size < b->max_size) { /* yes */
468 /* try again with more space */
470 b->buf = para_realloc(b->buf, b->size);
473 /* can't grow buffer */
474 if (!b->offset || !b->max_size_handler) /* message too large */
475 return -ERRNO_TO_PARA_ERROR(ENOSPC);
476 ret = b->max_size_handler(b->buf, b->offset, b->private_data);
483 /** \cond llong_minmax */
484 /* LLONG_MAX and LLONG_MIN might not be defined. */
486 #define LLONG_MAX 9223372036854775807LL
489 #define LLONG_MIN (-LLONG_MAX - 1LL)
491 /** \endcond llong_minmax */
494 * Convert a string to a 64-bit signed integer value.
496 * \param str The string to be converted.
497 * \param value Result pointer.
501 * \sa \ref para_atoi32(), strtol(3), atoi(3).
503 int para_atoi64(const char *str, int64_t *value)
508 errno = 0; /* To distinguish success/failure after call */
509 tmp = strtoll(str, &endptr, 10);
510 if (errno == ERANGE && (tmp == LLONG_MAX || tmp == LLONG_MIN))
511 return -E_ATOI_OVERFLOW;
513 * If there were no digits at all, strtoll() stores the original value
517 return -E_ATOI_NO_DIGITS;
519 * The implementation may also set errno and return 0 in case no
520 * conversion was performed.
522 if (errno != 0 && tmp == 0)
523 return -E_ATOI_NO_DIGITS;
524 if (*endptr != '\0') /* Further characters after number */
525 return -E_ATOI_JUNK_AT_END;
531 * Convert a string to a 32-bit signed integer value.
533 * \param str The string to be converted.
534 * \param value Result pointer.
538 * \sa \ref para_atoi64().
540 int para_atoi32(const char *str, int32_t *value)
544 const int32_t max = 2147483647;
546 ret = para_atoi64(str, &tmp);
549 if (tmp > max || tmp < -max - 1)
550 return -E_ATOI_OVERFLOW;
555 static inline int loglevel_equal(const char *arg, const char * const ll)
557 return !strncasecmp(arg, ll, strlen(ll));
561 * Compute the loglevel number from its name.
563 * \param txt The name of the loglevel (debug, info, ...).
565 * \return The numeric representation of the loglevel name.
567 int get_loglevel_by_name(const char *txt)
569 if (loglevel_equal(txt, "debug"))
571 if (loglevel_equal(txt, "info"))
573 if (loglevel_equal(txt, "notice"))
575 if (loglevel_equal(txt, "warning"))
577 if (loglevel_equal(txt, "error"))
579 if (loglevel_equal(txt, "crit"))
581 if (loglevel_equal(txt, "emerg"))
586 static int get_next_word(const char *buf, const char *delim, char **word)
588 enum line_state_flags {LSF_HAVE_WORD = 1, LSF_BACKSLASH = 2,
589 LSF_SINGLE_QUOTE = 4, LSF_DOUBLE_QUOTE = 8};
594 out = para_malloc(strlen(buf) + 1);
597 for (in = buf; *in; in++) {
602 if (state & LSF_BACKSLASH) /* \\ */
604 state |= LSF_BACKSLASH;
605 state |= LSF_HAVE_WORD;
609 if (state & LSF_BACKSLASH) { /* \n or \t */
610 *out++ = (*in == 'n')? '\n' : '\t';
611 state &= ~LSF_BACKSLASH;
616 if (state & LSF_BACKSLASH) /* \" */
618 if (state & LSF_SINGLE_QUOTE) /* '" */
620 if (state & LSF_DOUBLE_QUOTE) {
621 state &= ~LSF_DOUBLE_QUOTE;
624 state |= LSF_HAVE_WORD;
625 state |= LSF_DOUBLE_QUOTE;
628 if (state & LSF_BACKSLASH) /* \' */
630 if (state & LSF_DOUBLE_QUOTE) /* "' */
632 if (state & LSF_SINGLE_QUOTE) {
633 state &= ~LSF_SINGLE_QUOTE;
636 state |= LSF_HAVE_WORD;
637 state |= LSF_SINGLE_QUOTE;
640 for (p = delim; *p; p++) {
643 if (state & LSF_BACKSLASH)
645 if (state & LSF_SINGLE_QUOTE)
647 if (state & LSF_DOUBLE_QUOTE)
649 if (state & LSF_HAVE_WORD)
653 if (*p) /* ignore delimiter at the beginning */
656 state |= LSF_HAVE_WORD;
658 state &= ~LSF_BACKSLASH;
661 if (!(state & LSF_HAVE_WORD))
663 ret = -ERRNO_TO_PARA_ERROR(EINVAL);
664 if (state & LSF_BACKSLASH) {
665 PARA_ERROR_LOG("trailing backslash\n");
668 if ((state & LSF_SINGLE_QUOTE) || (state & LSF_DOUBLE_QUOTE)) {
669 PARA_ERROR_LOG("unmatched quote character\n");
682 * Get the number of the word the cursor is on.
684 * \param buf The zero-terminated line buffer.
685 * \param delim Characters that separate words.
686 * \param point The cursor position.
688 * \return Zero-based word number.
690 int compute_word_num(const char *buf, const char *delim, int point)
696 for (p = buf, num_words = 0; ; p += ret, num_words++) {
697 ret = get_next_word(p, delim, &word);
701 if (p + ret >= buf + point)
708 * Free an array of words created by create_argv() or create_shifted_argv().
710 * \param argv A pointer previously obtained by \ref create_argv().
712 void free_argv(char **argv)
718 for (i = 0; argv[i]; i++)
723 static int create_argv_offset(int offset, const char *buf, const char *delim,
726 char *word, **argv = para_malloc((offset + 1) * sizeof(char *));
730 for (i = 0; i < offset; i++)
732 for (p = buf; p && *p; p += ret, i++) {
733 ret = get_next_word(p, delim, &word);
738 argv = para_realloc(argv, (i + 2) * sizeof(char*));
753 * Split a buffer into words.
755 * This parser honors single and double quotes, backslash-escaped characters
756 * and special characters like \\n. The result contains pointers to copies of
757 * the words contained in buf and has to be freed by using \ref free_argv().
759 * \param buf The buffer to be split.
760 * \param delim Each character in this string is treated as a separator.
761 * \param result The array of words is returned here.
763 * It's OK to pass NULL as the buffer argument. This is equivalent to passing
766 * \return Number of words in buf, negative on errors. The array returned
767 * through the result pointer is NULL terminated.
769 int create_argv(const char *buf, const char *delim, char ***result)
771 return create_argv_offset(0, buf, delim, result);
775 * Split a buffer into words, offset one.
777 * This is similar to \ref create_argv() but the returned array is one element
778 * larger, words start at index one and element zero is initialized to \p NULL.
779 * Callers must set element zero to a non-NULL value before calling free_argv()
780 * on the returned array to avoid a memory leak.
782 * \param buf See \ref create_argv().
783 * \param delim See \ref create_argv().
784 * \param result See \ref create_argv().
786 * \return Number of words plus one on success, negative on errors.
788 int create_shifted_argv(const char *buf, const char *delim, char ***result)
790 return create_argv_offset(1, buf, delim, result);
794 * Find out if the given string is contained in the arg vector.
796 * \param arg The string to look for.
797 * \param argv The array to search.
799 * \return The first index whose value equals \a arg, or \p -E_ARG_NOT_FOUND if
800 * arg was not found in \a argv.
802 int find_arg(const char *arg, char **argv)
807 return -E_ARG_NOT_FOUND;
808 for (i = 0; argv[i]; i++)
809 if (strcmp(arg, argv[i]) == 0)
811 return -E_ARG_NOT_FOUND;
815 * Compile a regular expression.
817 * This simple wrapper calls regcomp() and logs a message on errors.
819 * \param preg See regcomp(3).
820 * \param regex See regcomp(3).
821 * \param cflags See regcomp(3).
825 int para_regcomp(regex_t *preg, const char *regex, int cflags)
829 int ret = regcomp(preg, regex, cflags);
833 size = regerror(ret, preg, NULL, 0);
834 buf = para_malloc(size);
835 regerror(ret, preg, buf, size);
836 PARA_ERROR_LOG("%s\n", buf);
842 * strdup() for not necessarily zero-terminated strings.
844 * \param src The source buffer.
845 * \param len The number of bytes to be copied.
847 * \return A 0-terminated buffer of length \a len + 1.
849 * This is similar to strndup(), which is a GNU extension. However, one
850 * difference is that strndup() returns \p NULL if insufficient memory was
851 * available while this function aborts in this case.
853 * \sa strdup(), \ref para_strdup().
855 char *safe_strdup(const char *src, size_t len)
859 assert(len < (size_t)-1);
860 p = para_malloc(len + 1);
868 * Copy the value of a key=value pair.
870 * This checks whether the given buffer starts with "key=", ignoring case. If
871 * yes, a copy of the value is returned. The source buffer may not be
874 * \param src The source buffer.
875 * \param len The number of bytes of the tag.
876 * \param key Only copy if it is the value of this key.
878 * \return A zero-terminated buffer, or \p NULL if the key was
879 * not of the given type.
881 char *key_value_copy(const char *src, size_t len, const char *key)
883 int keylen = strlen(key);
887 if (strncasecmp(src, key, keylen))
889 if (src[keylen] != '=')
891 return safe_strdup(src + keylen + 1, len - keylen - 1);
894 static bool utf8_mode(void)
896 static bool initialized, have_utf8;
899 char *info = nl_langinfo(CODESET);
900 have_utf8 = (info && strcmp(info, "UTF-8") == 0);
902 PARA_INFO_LOG("%susing UTF-8 character encoding\n",
903 have_utf8? "" : "not ");
908 static int xwcwidth(wchar_t wc, size_t pos)
912 /* special-case for tab */
913 if (wc == 0x09) /* tab */
914 return (pos | 7) + 1 - pos;
916 /* wcswidth() returns -1 for non-printable characters */
917 return n >= 0? n : 1;
920 static size_t xwcswidth(const wchar_t *s, size_t n)
925 w += xwcwidth(*s++, w);
930 * Skip a given number of cells at the beginning of a string.
932 * \param s The input string.
933 * \param cells_to_skip Desired number of cells that should be skipped.
934 * \param bytes_to_skip Result.
936 * This function computes how many input bytes must be skipped to advance a
937 * string by the given width. If the current character encoding is not UTF-8,
938 * this is simply the given number of cells, i.e. \a cells_to_skip. Otherwise,
939 * \a s is treated as a multibyte string and on successful return, \a s +
940 * bytes_to_skip points to the start of a multibyte string such that the total
941 * width of the multibyte characters that are skipped by advancing \a s that
942 * many bytes equals at least \a cells_to_skip.
946 int skip_cells(const char *s, size_t cells_to_skip, size_t *bytes_to_skip)
950 size_t n, bytes_parsed, cells_skipped;
953 if (cells_to_skip == 0)
956 *bytes_to_skip = cells_to_skip;
959 bytes_parsed = cells_skipped = 0;
960 memset(&ps, 0, sizeof(ps));
962 while (cells_to_skip > cells_skipped) {
965 mbret = mbrtowc(&wc, s + bytes_parsed, n - bytes_parsed, &ps);
967 if (mbret == (size_t)-1 || mbret == (size_t)-2)
968 return -ERRNO_TO_PARA_ERROR(EILSEQ);
969 bytes_parsed += mbret;
970 cells_skipped += xwcwidth(wc, cells_skipped);
972 *bytes_to_skip = bytes_parsed;
977 * Compute the width of an UTF-8 string.
979 * \param s The string.
980 * \param result The width of \a s is returned here.
982 * If not in UTF8-mode. this function is just a wrapper for strlen(3).
983 * Otherwise \a s is treated as an UTF-8 string and its display width is
984 * computed. Note that this function may fail if the underlying call to
985 * mbsrtowcs(3) fails, so the caller must check the return value.
987 * \sa nl_langinfo(3), wcswidth(3).
991 __must_check int strwidth(const char *s, size_t *result)
995 static wchar_t *dest;
999 * Never call any log function here. This may result in an endless loop
1000 * as para_gui's para_log() calls this function.
1004 *result = strlen(s);
1007 memset(&state, 0, sizeof(state));
1009 num_wchars = mbsrtowcs(NULL, &src, 0, &state);
1010 if (num_wchars == (size_t)-1)
1011 return -ERRNO_TO_PARA_ERROR(errno);
1012 if (num_wchars == 0)
1014 dest = para_malloc((num_wchars + 1) * sizeof(*dest));
1016 memset(&state, 0, sizeof(state));
1017 num_wchars = mbsrtowcs(dest, &src, num_wchars, &state);
1018 assert(num_wchars > 0 && num_wchars != (size_t)-1);
1019 *result = xwcswidth(dest, num_wchars);
1025 * Truncate and sanitize a (wide character) string.
1027 * This replaces all non-printable characters by spaces and makes sure that the
1028 * modified string does not exceed the given maximal width.
1030 * \param src The source string in multi-byte form.
1031 * \param max_width The maximal number of cells the result may occupy.
1032 * \param result Sanitized multi-byte string, must be freed by caller.
1033 * \param width The width of the sanitized string, always <= max_width.
1035 * The function is wide-character aware but falls back to C strings for
1036 * non-UTF-8 locales.
1038 * \return Standard. On success, *result points to a sanitized copy of the
1039 * given string. This copy was allocated with malloc() and should hence be
1040 * freed when the caller is no longer interested in the result.
1042 * The function fails if the given string contains an invalid multibyte
1043 * sequence. In this case, *result is set to NULL, and *width to zero.
1045 __must_check int sanitize_str(const char *src, size_t max_width,
1046 char **result, size_t *width)
1049 static wchar_t *wcs;
1050 size_t num_wchars, n;
1053 *result = para_strdup(src);
1054 /* replace non-printable characters by spaces */
1055 for (n = 0; n < max_width && src[n]; n++) {
1056 if (!isprint((unsigned char)src[n]))
1059 (*result)[n] = '\0';
1065 memset(&state, 0, sizeof(state));
1066 num_wchars = mbsrtowcs(NULL, &src, 0, &state);
1067 if (num_wchars == (size_t)-1)
1068 return -ERRNO_TO_PARA_ERROR(errno);
1069 wcs = para_malloc((num_wchars + 1) * sizeof(*wcs));
1070 memset(&state, 0, sizeof(state));
1071 num_wchars = mbsrtowcs(wcs, &src, num_wchars + 1, &state);
1072 assert(num_wchars != (size_t)-1);
1073 for (n = 0; n < num_wchars && *width < max_width; n++) {
1074 if (!iswprint(wcs[n]))
1076 *width += xwcwidth(wcs[n], *width);
1079 n = wcstombs(NULL, wcs, 0) + 1;
1080 *result = para_malloc(n);
1081 num_wchars = wcstombs(*result, wcs, n);
1082 assert(num_wchars != (size_t)-1);