enosys: avoid warnings when no aliases are found

Signed-off-by: Thomas Weißschuh <thomas@t-8ch.de>

diff --git a/misc-utils/enosys.c b/misc-utils/enosys.c
index 8415c63b5c9eaddc358921bb12fc00649f633c45..81e9323637532bb3f7b9e5252effef5bec02f899 100644 (file)
--- a/misc-utils/enosys.c
+++ b/misc-utils/enosys.c
@@ -58,6 +58,13 @@ struct syscall {
        long number;
 };
 
+/* When the alias arrays are empty the compiler emits -Wtype-limits warnings.
+ * Avoid those by going through this function. */
+static inline bool lt(size_t a, size_t b)
+{
+       return a < b;
+}
+
 static const struct syscall syscalls[] = {
 #define UL_SYSCALL(name, nr) { name, nr },
 #include "syscalls.h"
@@ -124,7 +131,7 @@ int main(int argc, char **argv)
                switch (c) {
                case 's':
                        found = 0;
-                       for (i = 0; i < ARRAY_SIZE(syscalls); i++) {
+                       for (i = 0; lt(i, ARRAY_SIZE(syscalls)); i++) {
                                if (strcmp(optarg, syscalls[i].name) == 0) {
                                        blocked_number = syscalls[i].number;
                                        found = 1;
@@ -142,7 +149,7 @@ int main(int argc, char **argv)
                        break;
                case 'i':
                        found = 0;
-                       for (i = 0; i < ARRAY_SIZE(ioctls); i++) {
+                       for (i = 0; lt(i, ARRAY_SIZE(ioctls)); i++) {
                                if (strcmp(optarg, ioctls[i].name) == 0) {
                                        blocked_number = ioctls[i].number;
                                        found = 1;
@@ -159,11 +166,11 @@ int main(int argc, char **argv)
 
                        break;
                case 'l':
-                       for (i = 0; i < ARRAY_SIZE(syscalls); i++)
+                       for (i = 0; lt(i, ARRAY_SIZE(syscalls)); i++)
                                printf("%5ld %s\n", syscalls[i].number, syscalls[i].name);
                        return EXIT_SUCCESS;
                case 'm':
-                       for (i = 0; i < ARRAY_SIZE(ioctls); i++)
+                       for (i = 0; lt(i, ARRAY_SIZE(ioctls)); i++)
                                printf("%5ld %s\n", ioctls[i].number, ioctls[i].name);
                        return EXIT_SUCCESS;
                case 'V':