diff options
Diffstat (limited to 'libX11/src/xcb_io.c')
| -rw-r--r-- | libX11/src/xcb_io.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/libX11/src/xcb_io.c b/libX11/src/xcb_io.c index 300ef571f..727c6c79f 100644 --- a/libX11/src/xcb_io.c +++ b/libX11/src/xcb_io.c @@ -19,6 +19,7 @@ #include <stdint.h> #include <stdlib.h> #include <string.h> +#include <limits.h> #ifdef HAVE_SYS_SELECT_H #include <sys/select.h> #endif @@ -757,3 +758,19 @@ void _XEatData(Display *dpy, unsigned long n) dpy->xcb->reply_consumed += n; _XFreeReplyData(dpy, False); } + +/* + * Read and discard "n" 32-bit words of data + * Matches the units of the length field in X protocol replies, and provides + * a single implementation of overflow checking to avoid having to replicate + * those checks in every caller. + */ +void _XEatDataWords(Display *dpy, unsigned long n) +{ + if (n < ((INT_MAX - dpy->xcb->reply_consumed) >> 2)) + dpy->xcb->reply_consumed += (n << 2); + else + /* Overflow would happen, so just eat the rest of the reply */ + dpy->xcb->reply_consumed = dpy->xcb->reply_length; + _XFreeReplyData(dpy, False); +} |