make parsing of DS arguments more robust and give more sensible

error messages. -- Alex

git-svn-id: svn://svn.oetiker.ch/rrdtool/branches/1.2/program@547 a5681a0c-68f1-0310-ab6d-d61299d08faa

diff --git a/src/rrd_create.c b/src/rrd_create.c
index 1c2cbd8..0d0671f 100644 (file)
--- a/src/rrd_create.c
+++ b/src/rrd_create.c
@@ -95,7 +95,7 @@ rrd_create_r(char *filename,
     rrd_t             rrd;
     long              i;
     int               offset;
-    char *token;
+    char *token,dummychar1,dummychar2;
     unsigned short token_idx, error_flag, period=0;
     unsigned long hashed_name;
 
@@ -146,19 +146,31 @@ rrd_create_r(char *filename,
            }
            memset(&rrd.ds_def[rrd.stat_head->ds_cnt], 0, sizeof(ds_def_t));
             /* extract the name and type */
-           if (sscanf(&argv[i][3],
-                      DS_NAM_FMT ":" DST_FMT ":%n",
-                      rrd.ds_def[rrd.stat_head->ds_cnt].ds_nam,
-                      rrd.ds_def[rrd.stat_head->ds_cnt].dst,&offset) == 2)
-            {
-                /* check for duplicate datasource names */
-                for(ii=0;ii<rrd.stat_head->ds_cnt;ii++)
-                    if(strcmp(rrd.ds_def[rrd.stat_head->ds_cnt].ds_nam,
-                              rrd.ds_def[ii].ds_nam) == 0){
-                        rrd_set_error("Duplicate DS name: %s",rrd.ds_def[ii].ds_nam);
-                    }                                                          
-            } else {
-                rrd_set_error("invalid DS format");
+           switch (sscanf(&argv[i][3],
+                       DS_NAM_FMT "%1[:]" DST_FMT "%1[:]%n",
+                       rrd.ds_def[rrd.stat_head->ds_cnt].ds_nam,
+                       &dummychar1,
+                       rrd.ds_def[rrd.stat_head->ds_cnt].dst,
+                       &dummychar2,
+                       &offset)) {
+               case 0:
+               case 1: rrd_set_error("Invalid DS name"); break;
+               case 2:
+               case 3: rrd_set_error("Invalid DS type"); break;
+               case 4: /* (%n may or may not be counted) */
+               case 5: /* check for duplicate datasource names */
+                   for (ii=0;ii<rrd.stat_head->ds_cnt;ii++)
+                       if(strcmp(rrd.ds_def[rrd.stat_head->ds_cnt].ds_nam,
+                               rrd.ds_def[ii].ds_nam) == 0)
+                           rrd_set_error("Duplicate DS name: %s",
+                                       rrd.ds_def[ii].ds_nam);
+                   /* DS_type may be valid or not. Checked later */
+                   break;
+               default: rrd_set_error("invalid DS format");
+            }
+           if (rrd_test_error()) {
+                rrd_free(&rrd);
+                return -1;
             }
             
             /* parse the remainder of the arguments */