LU-9859 libcfs: move cfs_expr_list_print to nidstrings.c

[fs/lustre-release.git] / lnet / lnet / nidstrings.c

diff --git a/lnet/lnet/nidstrings.c b/lnet/lnet/nidstrings.c
index 39c75b2..94224be 100644 (file)
--- a/lnet/lnet/nidstrings.c
+++ b/lnet/lnet/nidstrings.c
@@ -591,6 +591,72 @@ out:
        return rc;
 }
 
+/**
+ * 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 = scnprintf(buffer, count, "%u", expr->re_lo);
+       else if (expr->re_stride == 1)
+               i = scnprintf(buffer, count, "%s%u-%u%s",
+                             s, expr->re_lo, expr->re_hi, e);
+       else
+               i = scnprintf(buffer, count, "%s%u-%u/%u%s",
+                             s, expr->re_lo, expr->re_hi,
+                             expr->re_stride, e);
+       return i;
+}
+
+/**
+ * Print a list of range expressions (\a expr_list) into specified \a buffer.
+ * If the list contains several expressions, separate them with comma
+ * and surround the list with brackets.
+ *
+ * \retval number of characters written
+ */
+static int
+cfs_expr_list_print(char *buffer, int count, struct cfs_expr_list *expr_list)
+{
+       struct cfs_range_expr *expr;
+       int i = 0, j = 0;
+       int numexprs = 0;
+
+       if (count <= 0)
+               return 0;
+
+       list_for_each_entry(expr, &expr_list->el_exprs, re_link)
+               numexprs++;
+
+       if (numexprs > 1)
+               i += scnprintf(buffer + i, count - i, "[");
+
+       list_for_each_entry(expr, &expr_list->el_exprs, re_link) {
+               if (j++ != 0)
+                       i += scnprintf(buffer + i, count - i, ",");
+               i += cfs_range_expr_print(buffer + i, count - i, expr,
+                                         numexprs > 1);
+       }
+
+       if (numexprs > 1)
+               i += scnprintf(buffer + i, count - i, "]");
+
+       return i;
+}
+
 static int
 libcfs_ip_addr_range_print(char *buffer, int count, struct list_head *list)
 {