+EXPORT_SYMBOL(cfs_strdup);
+
+/**
+ * cfs_{v}snprintf() return the actual size that is printed rather than
+ * the size that would be printed in standard functions.
+ */
+/* safe vsnprintf */
+int cfs_vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
+{
+ int i;
+
+ LASSERT(size > 0);
+ i = vsnprintf(buf, size, fmt, args);
+
+ return (i >= size ? size - 1 : i);
+}
+EXPORT_SYMBOL(cfs_vsnprintf);
+
+/* safe snprintf */
+int cfs_snprintf(char *buf, size_t size, const char *fmt, ...)
+{
+ va_list args;
+ int i;
+
+ va_start(args, fmt);
+ i = cfs_vsnprintf(buf, size, fmt, args);
+ va_end(args);
+
+ return i;
+}
+EXPORT_SYMBOL(cfs_snprintf);
+
+/* get the first string out of @str */
+char *cfs_firststr(char *str, size_t size)
+{
+ size_t i = 0;
+ char *end;
+
+ /* trim leading spaces */
+ while (i < size && *str && isspace(*str)) {
+ ++i;
+ ++str;
+ }
+
+ /* string with all spaces */
+ if (*str == '\0')
+ goto out;
+
+ end = str;
+ while (i < size && *end != '\0' && !isspace(*end)) {
+ ++i;
+ ++end;
+ }
+
+ *end= '\0';
+out:
+ return str;
+}
+EXPORT_SYMBOL(cfs_firststr);
+
+char *
+cfs_trimwhite(char *str)
+{
+ char *end;
+
+ while (cfs_iswhite(*str))
+ str++;
+
+ end = str + strlen(str);
+ while (end > str) {
+ if (!cfs_iswhite(end[-1]))
+ break;
+ end--;
+ }
+
+ *end = 0;
+ return str;
+}
+EXPORT_SYMBOL(cfs_trimwhite);
+
+/**
+ * Extracts tokens from strings.
+ *
+ * Looks for \a delim in string \a next, sets \a res to point to
+ * substring before the delimiter, sets \a next right after the found
+ * delimiter.
+ *
+ * \retval 1 if \a res points to a string of non-whitespace characters
+ * \retval 0 otherwise
+ */
+int
+cfs_gettok(struct cfs_lstr *next, char delim, struct cfs_lstr *res)
+{
+ char *end;
+
+ if (next->ls_str == NULL)
+ return 0;
+
+ /* skip leading white spaces */
+ while (next->ls_len) {
+ if (!cfs_iswhite(*next->ls_str))
+ break;
+ next->ls_str++;
+ next->ls_len--;
+ }
+
+ if (next->ls_len == 0) /* whitespaces only */
+ return 0;
+
+ if (*next->ls_str == delim) {
+ /* first non-writespace is the delimiter */
+ return 0;
+ }
+
+ res->ls_str = next->ls_str;
+ end = memchr(next->ls_str, delim, next->ls_len);
+ if (end == NULL) {
+ /* there is no the delimeter in the string */
+ end = next->ls_str + next->ls_len;
+ next->ls_str = NULL;
+ } else {
+ next->ls_str = end + 1;
+ next->ls_len -= (end - res->ls_str + 1);
+ }
+
+ /* skip ending whitespaces */
+ while (--end != res->ls_str) {
+ if (!cfs_iswhite(*end))
+ break;
+ }
+
+ res->ls_len = end - res->ls_str + 1;
+ return 1;
+}
+EXPORT_SYMBOL(cfs_gettok);
+
+/**
+ * Converts string to integer.
+ *
+ * Accepts decimal and hexadecimal number recordings.
+ *
+ * \retval 1 if first \a nob chars of \a str convert to decimal or
+ * hexadecimal integer in the range [\a min, \a max]
+ * \retval 0 otherwise
+ */
+int
+cfs_str2num_check(char *str, int nob, unsigned *num,
+ unsigned min, unsigned max)
+{
+ char *endp;
+
+ *num = strtoul(str, &endp, 0);
+ if (endp == str)
+ return 0;
+
+ for (; endp < str + nob; endp++) {
+ if (!cfs_iswhite(*endp))
+ return 0;
+ }
+
+ return (*num >= min && *num <= max);
+}
+EXPORT_SYMBOL(cfs_str2num_check);
+
+/**
+ * Parses \<range_expr\> token of the syntax. If \a bracketed is false,
+ * \a src should only have a single token which can be \<number\> or \*
+ *
+ * \retval pointer to allocated range_expr and initialized
+ * range_expr::re_lo, range_expr::re_hi and range_expr:re_stride if \a
+ `* src parses to
+ * \<number\> |
+ * \<number\> '-' \<number\> |
+ * \<number\> '-' \<number\> '/' \<number\>
+ * \retval 0 will be returned if it can be parsed, otherwise -EINVAL or
+ * -ENOMEM will be returned.
+ */
+int
+cfs_range_expr_parse(struct cfs_lstr *src, unsigned min, unsigned max,
+ int bracketed, struct cfs_range_expr **expr)
+{
+ struct cfs_range_expr *re;
+ struct cfs_lstr tok;
+
+ LIBCFS_ALLOC(re, sizeof(*re));
+ if (re == NULL)
+ return -ENOMEM;
+
+ if (src->ls_len == 1 && src->ls_str[0] == '*') {
+ re->re_lo = min;
+ re->re_hi = max;
+ re->re_stride = 1;
+ goto out;
+ }
+
+ if (cfs_str2num_check(src->ls_str, src->ls_len,
+ &re->re_lo, min, max)) {
+ /* <number> is parsed */
+ re->re_hi = re->re_lo;
+ re->re_stride = 1;
+ goto out;
+ }
+
+ if (!bracketed || !cfs_gettok(src, '-', &tok))
+ goto failed;
+
+ if (!cfs_str2num_check(tok.ls_str, tok.ls_len,
+ &re->re_lo, min, max))
+ goto failed;
+
+ /* <number> - */
+ if (cfs_str2num_check(src->ls_str, src->ls_len,
+ &re->re_hi, min, max)) {
+ /* <number> - <number> is parsed */
+ re->re_stride = 1;
+ goto out;
+ }
+
+ /* go to check <number> '-' <number> '/' <number> */
+ if (cfs_gettok(src, '/', &tok)) {
+ if (!cfs_str2num_check(tok.ls_str, tok.ls_len,
+ &re->re_hi, min, max))
+ goto failed;
+
+ /* <number> - <number> / ... */
+ if (cfs_str2num_check(src->ls_str, src->ls_len,
+ &re->re_stride, min, max)) {
+ /* <number> - <number> / <number> is parsed */
+ goto out;
+ }
+ }
+
+ out:
+ *expr = re;
+ return 0;
+
+ failed:
+ LIBCFS_FREE(re, sizeof(*re));
+ return -EINVAL;
+}
+EXPORT_SYMBOL(cfs_range_expr_parse);
+
+/**
+ * Print the range expression \a re into specified \a buffer.
+ * If \a bracketed is true, expression does not need additional
+ * brackets.
+ *
+ * \retval number of characters written
+ */
+static int
+cfs_range_expr_print(char *buffer, int count, struct cfs_range_expr *expr,
+ bool bracketed)
+{
+ int i;
+ char s[] = "[";
+ char e[] = "]";
+
+ if (bracketed)
+ s[0] = e[0] = '\0';
+
+ if (expr->re_lo == expr->re_hi)
+ i = cfs_snprintf(buffer, count, "%u", expr->re_lo);
+ else if (expr->re_stride == 1)
+ i = cfs_snprintf(buffer, count, "%s%u-%u%s",
+ s, expr->re_lo, expr->re_hi, e);
+ else
+ i = cfs_snprintf(buffer, count, "%s%u-%u/%u%s",
+ s, expr->re_lo, expr->re_hi,
+ expr->re_stride, e);
+ return i;
+}