[PATCH v2] tools: fix several "format-truncation" warnings with GCC 7

[Zhongze Liu <blackskygg@gmail.com>]

GCC 7.1.1 complains that several buffers passed to snprintf() in xenpmd
and tools/ocmal/xc are too small to hold the largest possible resulting string.

enlarge the size of these buffers to fix the warnings.

Signed-off-by: Zhongze Liu <blackskygg@gmail.com>
---
CC: David Scott <dave@recoil.org>
CC: Ian Jackson <ian.jackson@eu.citrix.com>
CC: Wei Liu <wei.liu2@citrix.com>

Changed since v1:
  * Changed the word "error" to "warning" in title and description
  * Enlarge the buffer instead of replacing snprintf() with asprintf()
---
 tools/ocaml/libs/xc/xenctrl_stubs.c | 2 +-
 tools/xenpmd/xenpmd.c               | 6 +++---
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/tools/ocaml/libs/xc/xenctrl_stubs.c b/tools/ocaml/libs/xc/xenctrl_stubs.c
index 5e455519d4..f1b28db53a 100644
--- a/tools/ocaml/libs/xc/xenctrl_stubs.c
+++ b/tools/ocaml/libs/xc/xenctrl_stubs.c
@@ -54,7 +54,7 @@
 
 static void Noreturn failwith_xc(xc_interface *xch)
 {
-	char error_str[256];
+	char error_str[1028];
 	if (xch) {
 		const xc_error *error = xc_get_last_error(xch);
 		if (error->code == XC_ERROR_NONE)
diff --git a/tools/xenpmd/xenpmd.c b/tools/xenpmd/xenpmd.c
index b3a31062aa..df96f2683f 100644
--- a/tools/xenpmd/xenpmd.c
+++ b/tools/xenpmd/xenpmd.c
@@ -100,7 +100,7 @@ FILE *get_next_battery_file(DIR *battery_dir,
 {
     FILE *file = 0;
     struct dirent *dir_entries;
-    char file_name[32];
+    char file_name[512];
     
     do 
     {
@@ -110,10 +110,10 @@ FILE *get_next_battery_file(DIR *battery_dir,
         if ( strlen(dir_entries->d_name) < 4 )
             continue;
         if ( battery_info_type == BIF ) 
-            snprintf(file_name, 32, BATTERY_INFO_FILE_PATH,
+	    snprintf(file_name, sizeof(file_name), BATTERY_INFO_FILE_PATH,
                      dir_entries->d_name);
         else 
-            snprintf(file_name, 32, BATTERY_STATE_FILE_PATH,
+            snprintf(file_name, sizeof(file_name), BATTERY_STATE_FILE_PATH,
                      dir_entries->d_name);
         file = fopen(file_name, "r");
     } while ( !file );
-- 
2.13.1


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