Fix misc. warnings from GCC when compiling with -fsanitize=undefined (#…

…3787)

src/H5Dmpio.c

@@ -911,7 +911,8 @@ H5D__mpio_get_no_coll_cause_strings(char *local_cause, size_t local_cause_len, c
             case H5D_MPIO_COLLECTIVE:
             case H5D_MPIO_NO_COLLECTIVE_MAX_CAUSE:
             default:
-                assert(0 && "invalid no collective cause reason");
+                cause_str = "invalid or unknown no collective cause reason";
+                assert(0 && "invalid or unknown no collective cause reason");
                 break;
         }
 

src/H5FDfamily.c

@@ -1427,7 +1427,8 @@ H5FD__family_delete(const char *filename, hid_t fapl_id)
 
     FUNC_ENTER_PACKAGE
 
-    assert(filename);
+    if (!filename)
+        HGOTO_ERROR(H5E_VFL, H5E_BADVALUE, FAIL, "invalid filename pointer");
 
     /* Get the driver info (for the member fapl)
      * The family_open call accepts H5P_DEFAULT, so we'll accept that here, too.

src/H5FDlog.c

@@ -545,7 +545,7 @@ H5FD__log_open(const char *name, unsigned flags, hid_t fapl_id, haddr_t maxaddr)
 #endif /* H5_HAVE_WIN32_API */
 
     /* Retain a copy of the name used to open the file, for possible error reporting */
-    strncpy(file->filename, name, sizeof(file->filename));
+    strncpy(file->filename, name, sizeof(file->filename) - 1);
     file->filename[sizeof(file->filename) - 1] = '\0';
 
     /* Get the flags for logging */

src/H5FDsec2.c

@@ -368,7 +368,7 @@ H5FD__sec2_open(const char *name, unsigned flags, hid_t fapl_id, haddr_t maxaddr
     }
 
     /* Retain a copy of the name used to open the file, for possible error reporting */
-    strncpy(file->filename, name, sizeof(file->filename));
+    strncpy(file->filename, name, sizeof(file->filename) - 1);
     file->filename[sizeof(file->filename) - 1] = '\0';
 
     /* Check for non-default FAPL */

src/H5T.c

@@ -2501,7 +2501,7 @@ H5T__register(H5T_pers_t pers, const char *name, H5T_t *src, H5T_t *dst, H5T_con
             H5T_g.asoft = na;
             H5T_g.soft  = x;
         } /* end if */
-        strncpy(H5T_g.soft[H5T_g.nsoft].name, name, (size_t)H5T_NAMELEN);
+        strncpy(H5T_g.soft[H5T_g.nsoft].name, name, (size_t)H5T_NAMELEN - 1);
         H5T_g.soft[H5T_g.nsoft].name[H5T_NAMELEN - 1] = '\0';
         H5T_g.soft[H5T_g.nsoft].src                   = src->shared->type;
         H5T_g.soft[H5T_g.nsoft].dst                   = dst->shared->type;
@@ -2550,7 +2550,7 @@ H5T__register(H5T_pers_t pers, const char *name, H5T_t *src, H5T_t *dst, H5T_con
             /* Create a new conversion path */
             if (NULL == (new_path = H5FL_CALLOC(H5T_path_t)))
                 HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed");
-            strncpy(new_path->name, name, (size_t)H5T_NAMELEN);
+            strncpy(new_path->name, name, (size_t)H5T_NAMELEN - 1);
             new_path->name[H5T_NAMELEN - 1] = '\0';
             if (NULL == (new_path->src = H5T_copy(old_path->src, H5T_COPY_ALL)) ||
                 NULL == (new_path->dst = H5T_copy(old_path->dst, H5T_COPY_ALL)))
@@ -4953,7 +4953,7 @@ H5T__path_find_real(const H5T_t *src, const H5T_t *dst, const char *name, H5T_co
         if (NULL == (path = H5FL_CALLOC(H5T_path_t)))
             HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed for type conversion path");
         if (name && *name) {
-            strncpy(path->name, name, (size_t)H5T_NAMELEN);
+            strncpy(path->name, name, (size_t)H5T_NAMELEN - 1);
             path->name[H5T_NAMELEN - 1] = '\0';
         } /* end if */
         else

tools/src/misc/h5repart.c

@@ -227,6 +227,10 @@ main(int argc, char *argv[])
     if (argno >= argc)
         usage(prog_name);
     src_gen_name = argv[argno++];
+    if (!src_gen_name) {
+        fprintf(stderr, "invalid source file name pointer");
+        exit(EXIT_FAILURE);
+    }
     snprintf(src_name, NAMELEN, src_gen_name, src_membno);
     src_is_family = strcmp(src_name, src_gen_name);
 
@@ -249,6 +253,10 @@ main(int argc, char *argv[])
     if (argno >= argc)
         usage(prog_name);
     dst_gen_name = argv[argno++];
+    if (!dst_gen_name) {
+        fprintf(stderr, "invalid destination file name pointer");
+        exit(EXIT_FAILURE);
+    }
     snprintf(dst_name, NAMELEN, dst_gen_name, dst_membno);
     dst_is_family = strcmp(dst_name, dst_gen_name);