LU-9121 lnet: add show udsp command

[fs/lustre-release.git] / libcfs / libcfs / util / nidstrings.c

diff --git a/libcfs/libcfs/util/nidstrings.c b/libcfs/libcfs/util/nidstrings.c
index dc996a4..7d13e47 100644 (file)
--- a/libcfs/libcfs/util/nidstrings.c
+++ b/libcfs/libcfs/util/nidstrings.c
@@ -189,6 +189,77 @@ out:
        return rc;
 }
 
+int
+cfs_expr2str(struct list_head *list, char *str, size_t size)
+{
+       struct cfs_expr_list *expr;
+       struct cfs_range_expr *range;
+       char tmp[LNET_NIDSTR_SIZE];
+       size_t len;
+       bool first;
+       bool bracket = false;
+       char *format;
+       char *tmpc;
+
+       list_for_each_entry(expr, list, el_link) {
+               first = true;
+               list_for_each_entry(range, &expr->el_exprs, re_link) {
+                       if (range->re_lo == range->re_hi) {
+                               snprintf(tmp,
+                                        LNET_NIDSTR_SIZE,
+                                        "%u.", range->re_lo);
+                       } else if (range->re_lo < range->re_hi) {
+                               if (range->re_stride > 1) {
+                                       if (first)
+                                               format = "[%u-%u/%u,";
+                                       else
+                                               format = "%u-%u/%u,";
+                                       snprintf(tmp, LNET_NIDSTR_SIZE,
+                                               format, range->re_lo,
+                                               range->re_hi, range->re_stride);
+                                       bracket = true;
+                               } else {
+                                       if (first)
+                                               format = "[%u-%u,";
+                                       else
+                                               format = "%u-%u,";
+                                       snprintf(tmp, LNET_NIDSTR_SIZE,
+                                               format, range->re_lo,
+                                               range->re_hi);
+                                       bracket = true;
+                               }
+                       } else {
+                               return -EINVAL;
+                       }
+                       len = strlen(tmp);
+                       size -= (len + 1);
+                       if (size < 0)
+                               return -ENOBUFS;
+
+                       strncat(str, tmp, size + len);
+                       first = false;
+               }
+               if (bracket) {
+                       tmpc = str + (strlen(str) - 1);
+                       size -= 1;
+                       if (size < 0)
+                               return -ENOBUFS;
+                       *tmpc = ']';
+                       *(tmpc+1) = '.';
+                       bracket = false;
+               }
+       }
+
+       /*
+        * get rid of the trailing '.' at the end of the string
+        * only if we actually had something on the list passed in.
+        * otherwise we could write outside the array
+        */
+       if (!list_empty(list))
+               str[strlen(str)-1] = '\0';
+       return size;
+}
+
 static int
 libcfs_num_addr_range_expand(struct list_head *addrranges, __u32 *addrs,
                             int max_addrs)