Mesa (master): loader: Fix compiler warnings about truncating the PCI ID path.

[Eric Anholt]

Module: Mesa
Branch: master
Commit: 7075c084fc5699d76970d2f045c8c7c668dc53d8
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=7075c084fc5699d76970d2f045c8c7c668dc53d8

Author: Eric Anholt <eric at anholt.net>
Date:   Sat Feb 10 10:45:18 2018 +0000

loader: Fix compiler warnings about truncating the PCI ID path.

My build was producing:

../src/loader/loader.c:121:67: warning: ‘%1u’ directive output may be truncated writing between 1 and 3 bytes into a region of size 2 [-Wformat-truncation=]

and we can avoid this careful calculation by just using asprintf (as we do
elsewhere in the file).

Reviewed-by: Eric Engestrom <eric.engestrom at imgtec.com>
Reviewed-by: Emil Velikov <emil.velikov at collabora.com>
Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>

---

 src/loader/loader.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/src/loader/loader.c b/src/loader/loader.c
index 913b3dcac0..92b4c5204b 100644
--- a/src/loader/loader.c
+++ b/src/loader/loader.c
@@ -110,17 +110,16 @@ static char *loader_get_dri_config_device_id(void)
 
 static char *drm_construct_id_path_tag(drmDevicePtr device)
 {
-#define PCI_ID_PATH_TAG_LENGTH sizeof("pci-xxxx_xx_xx_x")
    char *tag = NULL;
 
    if (device->bustype == DRM_BUS_PCI) {
-        tag = calloc(PCI_ID_PATH_TAG_LENGTH, sizeof(char));
-        if (tag == NULL)
-            return NULL;
-
-        snprintf(tag, PCI_ID_PATH_TAG_LENGTH, "pci-%04x_%02x_%02x_%1u",
-                 device->businfo.pci->domain, device->businfo.pci->bus,
-                 device->businfo.pci->dev, device->businfo.pci->func);
+      if (asprintf(&tag, "pci-%04x_%02x_%02x_%1u",
+                   device->businfo.pci->domain,
+                   device->businfo.pci->bus,
+                   device->businfo.pci->dev,
+                   device->businfo.pci->func) < 0) {
+         return NULL;
+      }
    }
    return tag;
 }