auth: use snprintf() return value

That save us from a strlen().

Signed-off-by: Julien Danjou <julien@danjou.info>

diff --git a/src/xcb_auth.c b/src/xcb_auth.c
index a648b16..6e0ff46 100644 (file)
--- a/src/xcb_auth.c
+++ b/src/xcb_auth.c
@@ -97,6 +97,7 @@ static Xauth *get_authptr(struct sockaddr *sockname, unsigned int socknamelen,
     unsigned short family;
     char hostnamebuf[256];   /* big enough for max hostname */
     char dispbuf[40];   /* big enough to hold more than 2^64 base 10 */
+    int dispbuflen;
 
     family = FamilyLocal; /* 256 */
     switch(sockname->sa_family)
@@ -127,7 +128,11 @@ static Xauth *get_authptr(struct sockaddr *sockname, unsigned int socknamelen,
         return 0;   /* cannot authenticate this family */
     }
 
-    snprintf(dispbuf, sizeof(dispbuf), "%d", display);
+    dispbuflen = snprintf(dispbuf, sizeof(dispbuf), "%d", display);
+    if(dispbuflen < 0)
+        return 0;
+    /* snprintf may have truncate our text */
+    dispbuflen = MIN(dispbuflen, sizeof(dispbuf) - 1);
 
     if (family == FamilyLocal) {
         if (gethostname(hostnamebuf, sizeof(hostnamebuf)) == -1)
@@ -138,7 +143,7 @@ static Xauth *get_authptr(struct sockaddr *sockname, unsigned int socknamelen,
 
     return XauGetBestAuthByAddr (family,
                                  (unsigned short) addrlen, addr,
-                                 (unsigned short) strlen(dispbuf), dispbuf,
+                                 (unsigned short) dispbuflen, dispbuf,
                                  N_AUTH_PROTOS, authnames, authnameslen);
 }
 

diff --git a/src/xcbint.h b/src/xcbint.h
index dac0a61..154cca0 100644 (file)
--- a/src/xcbint.h
+++ b/src/xcbint.h
@@ -60,6 +60,10 @@ enum lazy_reply_tag
 #define offsetof(type,member) ((size_t) &((type *)0)->member)
 #endif
 
+#ifndef MIN
+#define MIN(x,y) ((x) < (y) ? (x) : (y))
+#endif
+
 #define container_of(pointer,type,member) ((type *)(((char *)(pointer)) - offsetof(type, member)))
 
 /* xcb_list.c */