xkbcomp: Improved -w option parsing

This patch improves -w option parsing even further, for cases like
"xkbcomp -w6 4.xkb out.xkb" (which were not handled by the fix of
the warning level is still optional (set to 0 if not present), and
errors like "xkbcomp -wfoo in out" are detected and reported.

https://bugs.freedesktop.org/show_bug.cgi?id=66344Signed-off-by: Vincent Lefevre <vincent@vinc17.net>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

xkbcomp.c

@@ -576,17 +576,37 @@ parseArgs(int argc, char *argv[])
         }
         else if (strncmp(argv[i], "-w", 2) == 0)
         {
-            if ((i >= (argc - 1)) || (!isdigit(argv[i + 1][0])))
+            unsigned long utmp;
+            char *tmp2;
+            /* If text is just after "-w" in the same word, then it must
+             * be a number and it is the warning level. Otherwise, if the
+             * next argument is a number, then it is the warning level,
+             * else the warning level is assumed to be 0.
+             */
+            if (argv[i][2] == '\0')
             {
                 warningLevel = 0;
-                if (isdigit(argv[i][2]))
-                    if (sscanf(&argv[i][2], "%i", &itmp) == 1)
-                        warningLevel = itmp;
+                if (i < argc - 1)
+                {
+                    utmp = strtoul(argv[i+1], &tmp2, 10);
+                    if (argv[i+1][0] != '\0' && *tmp2 == '\0')
+                    {
+                        warningLevel = utmp > 10 ? 10 : utmp;
+                        i++;
+                    }
+                }
             }
             else
             {
-                if (sscanf(argv[++i], "%i", &itmp) == 1)
-                    warningLevel = itmp;
+                utmp = strtoul(&argv[i][2], &tmp2, 10);
+                if (*tmp2 == '\0')
+                    warningLevel = utmp > 10 ? 10 : utmp;
+                else
+                {
+                    ERROR1("Unknown flag \"%s\" on command line\n", argv[i]);
+                    Usage(argc, argv);
+                    return False;
+                }
             }
         }
         else if ((strcmp(argv[i], "-xkb") == 0) && (!xkblist))