[libvirt] [PATCH 1/7] Rewrite keycode map to avoid a struct
Daniel P. Berrange
berrange at redhat.com
Wed Apr 3 15:06:35 UTC 2013
From: "Daniel P. Berrange" <berrange at redhat.com>
Playing games with field offsets in a struct causes all sorts
of alignment warnings on ARM platforms
util/virkeycode.c: In function '__virKeycodeValueFromString':
util/virkeycode.c:26:7: warning: cast increases required alignment of target type [-Wcast-align]
(*(typeof(field_type) *)((char *)(object) + field_offset))
^
util/virkeycode.c:91:28: note: in expansion of macro 'getfield'
const char *name = getfield(virKeycodes + i, const char *, name_offset);
^
util/virkeycode.c:26:7: warning: cast increases required alignment of target type [-Wcast-align]
(*(typeof(field_type) *)((char *)(object) + field_offset))
^
util/virkeycode.c:94:20: note: in expansion of macro 'getfield'
return getfield(virKeycodes + i, unsigned short, code_offset);
^
util/virkeycode.c: In function '__virKeycodeValueTranslate':
util/virkeycode.c:26:7: warning: cast increases required alignment of target type [-Wcast-align]
(*(typeof(field_type) *)((char *)(object) + field_offset))
^
util/virkeycode.c:127:13: note: in expansion of macro 'getfield'
if (getfield(virKeycodes + i, unsigned short, from_offset) == key_value)
^
util/virkeycode.c:26:7: warning: cast increases required alignment of target type [-Wcast-align]
(*(typeof(field_type) *)((char *)(object) + field_offset))
^
util/virkeycode.c:128:20: note: in expansion of macro 'getfield'
return getfield(virKeycodes + i, unsigned short, to_offset);
There is no compelling reason to use a struct for the keycode
tables. It can easily just use an array of arrays instead,
avoiding all alignment problems
Signed-off-by: Daniel P. Berrange <berrange at redhat.com>
---
src/util/virkeycode-mapgen.py | 78 ++++++++++++++++++-------
src/util/virkeycode.c | 130 ++++++++++++++++++------------------------
2 files changed, 110 insertions(+), 98 deletions(-)
diff --git a/src/util/virkeycode-mapgen.py b/src/util/virkeycode-mapgen.py
index d3d2aae..34de637 100755
--- a/src/util/virkeycode-mapgen.py
+++ b/src/util/virkeycode-mapgen.py
@@ -13,7 +13,22 @@ instead of keymaps.csv which is a mirror.
import sys
import re
-namecolums = (0,2,10)
+cols = (
+ ["linux", True],
+ ["linux", False],
+ ["os_x", True],
+ ["os_x", False],
+ ["atset1", False],
+ ["atset2", False],
+ ["atset3", False],
+ ["xt", False],
+ ["xt_kbd", False],
+ ["usb", False],
+ ["win32", True],
+ ["win32", False],
+ ["rfb", False],
+)
+
xtkbdkey_index = 8
def quotestring(str):
@@ -28,29 +43,48 @@ print '''
# error do not use this; it is not a public header
#endif
-struct keycode virKeycodes[] = {
'''
sys.stdin.readline() # eat the fist line.
+keycodes = []
+
+max = 0
+
for line in sys.stdin.xreadlines():
- a = re.match("([^,]*)," * 13 + "([^,]*)$", line[0:-1]).groups()
- b = ""
- rfbkey = 0
- for i in namecolums:
- b = b + (a[i] and quotestring(a[i]) or 'NULL') + ','
- for i in [ x for x in range(12) if not x in namecolums ]:
- b = b + (a[i] or '0') + ','
- if i == xtkbdkey_index:
- # RFB keycodes are XT kbd keycodes with a slightly
- # different encoding of 0xe0 scan codes. RFB uses
- # the high bit of the first byte, instead of the low
- # bit of the second byte.
- rfbkey = int(a[i] or '0')
- rfbkey = (rfbkey & 0x100) >> 1 | (rfbkey & 0x7f)
-
- # Append RFB keycode as the last column
- b = b + str(rfbkey)
- print " { " + b + "},"
-
-print '};'
+ values = re.match("([^,]*)," * 13 + "([^,]*)$", line[0:-1]).groups()
+
+ data = []
+ for v in values:
+ data.append(v)
+
+ # RFB keycodes are XT kbd keycodes with a slightly
+ # different encoding of 0xe0 scan codes. RFB uses
+ # the high bit of the first byte, instead of the low
+ # bit of the second byte.
+ rfbkey = int(data[xtkbdkey_index] or '0')
+ rfbkey = (rfbkey & 0x100) >> 1 | (rfbkey & 0x7f)
+ data.append(rfbkey)
+
+ keycodes.append(data)
+ max = max + 1
+
+print "#define VIR_KEYMAP_ENTRY_MAX " + str(max)
+
+for i in range(len(cols)):
+ col=cols[i]
+ name=col[0]
+ isname=col[1]
+ if isname:
+ print "const char *virKeymapNames_" + name + "[] = {"
+ else:
+ print "unsigned short virKeymapValues_" + name + "[] = {"
+
+ for entry in keycodes:
+ if isname:
+ print " " + quotestring(entry[i] or "NULL") + ","
+ else:
+ print " " + (entry[i] or "0") + ","
+
+ print "};\n"
+
diff --git a/src/util/virkeycode.c b/src/util/virkeycode.c
index 7ce485c..9b2809d 100644
--- a/src/util/virkeycode.c
+++ b/src/util/virkeycode.c
@@ -22,51 +22,57 @@
#include <string.h>
#include <stddef.h>
-#define getfield(object, field_type, field_offset) \
- (*(typeof(field_type) *)((char *)(object) + field_offset))
-
-struct keycode {
- const char *linux_name;
- const char *os_x_name;
- const char *win32_name;
- unsigned short linux_keycode;
- unsigned short os_x;
- unsigned short atset1;
- unsigned short atset2;
- unsigned short atset3;
- unsigned short xt;
- unsigned short xt_kbd;
- unsigned short usb;
- unsigned short win32;
- unsigned short rfb;
-};
#define VIRT_KEY_INTERNAL
#include "virkeymaps.h"
-static unsigned int codeOffset[] = {
+static const char **virKeymapNames[] = {
[VIR_KEYCODE_SET_LINUX] =
- offsetof(struct keycode, linux_keycode),
+ virKeymapNames_linux,
[VIR_KEYCODE_SET_XT] =
- offsetof(struct keycode, xt),
+ NULL,
[VIR_KEYCODE_SET_ATSET1] =
- offsetof(struct keycode, atset1),
+ NULL,
[VIR_KEYCODE_SET_ATSET2] =
- offsetof(struct keycode, atset2),
+ NULL,
[VIR_KEYCODE_SET_ATSET3] =
- offsetof(struct keycode, atset3),
+ NULL,
[VIR_KEYCODE_SET_OSX] =
- offsetof(struct keycode, os_x),
+ virKeymapNames_os_x,
[VIR_KEYCODE_SET_XT_KBD] =
- offsetof(struct keycode, xt_kbd),
+ NULL,
[VIR_KEYCODE_SET_USB] =
- offsetof(struct keycode, usb),
+ NULL,
[VIR_KEYCODE_SET_WIN32] =
- offsetof(struct keycode, win32),
+ virKeymapNames_win32,
[VIR_KEYCODE_SET_RFB] =
- offsetof(struct keycode, rfb),
+ NULL,
};
-verify(ARRAY_CARDINALITY(codeOffset) == VIR_KEYCODE_SET_LAST);
+verify(ARRAY_CARDINALITY(virKeymapNames) == VIR_KEYCODE_SET_LAST);
+
+static unsigned short *virKeymapValues[] = {
+ [VIR_KEYCODE_SET_LINUX] =
+ virKeymapValues_linux,
+ [VIR_KEYCODE_SET_XT] =
+ virKeymapValues_xt,
+ [VIR_KEYCODE_SET_ATSET1] =
+ virKeymapValues_atset1,
+ [VIR_KEYCODE_SET_ATSET2] =
+ virKeymapValues_atset2,
+ [VIR_KEYCODE_SET_ATSET3] =
+ virKeymapValues_atset3,
+ [VIR_KEYCODE_SET_OSX] =
+ virKeymapValues_os_x,
+ [VIR_KEYCODE_SET_XT_KBD] =
+ virKeymapValues_xt_kbd,
+ [VIR_KEYCODE_SET_USB] =
+ virKeymapValues_usb,
+ [VIR_KEYCODE_SET_WIN32] =
+ virKeymapValues_win32,
+ [VIR_KEYCODE_SET_RFB] =
+ virKeymapValues_rfb,
+};
+verify(ARRAY_CARDINALITY(virKeymapValues) == VIR_KEYCODE_SET_LAST);
VIR_ENUM_IMPL(virKeycodeSet, VIR_KEYCODE_SET_LAST,
"linux",
@@ -81,68 +87,40 @@ VIR_ENUM_IMPL(virKeycodeSet, VIR_KEYCODE_SET_LAST,
"rfb",
);
-static int __virKeycodeValueFromString(unsigned int name_offset,
- unsigned int code_offset,
- const char *keyname)
+int virKeycodeValueFromString(virKeycodeSet codeset,
+ const char *keyname)
{
int i;
- for (i = 0; i < ARRAY_CARDINALITY(virKeycodes); i++) {
- const char *name = getfield(virKeycodes + i, const char *, name_offset);
+ for (i = 0; i < VIR_KEYMAP_ENTRY_MAX; i++) {
+ if (!virKeymapNames[codeset] ||
+ !virKeymapValues[codeset])
+ continue;
- if (name && STREQ(name, keyname))
- return getfield(virKeycodes + i, unsigned short, code_offset);
- }
-
- return -1;
-}
+ const char *name = virKeymapNames[codeset][i];
-int virKeycodeValueFromString(virKeycodeSet codeset, const char *keyname)
-{
- switch (codeset) {
- case VIR_KEYCODE_SET_LINUX:
- return __virKeycodeValueFromString(offsetof(struct keycode, linux_name),
- offsetof(struct keycode, linux_keycode),
- keyname);
- case VIR_KEYCODE_SET_OSX:
- return __virKeycodeValueFromString(offsetof(struct keycode, os_x_name),
- offsetof(struct keycode, os_x),
- keyname);
- case VIR_KEYCODE_SET_WIN32:
- return __virKeycodeValueFromString(offsetof(struct keycode, win32_name),
- offsetof(struct keycode, win32),
- keyname);
- default:
- return -1;
- }
-}
-
-static int __virKeycodeValueTranslate(unsigned int from_offset,
- unsigned int to_offset,
- int key_value)
-{
- int i;
-
- for (i = 0; i < ARRAY_CARDINALITY(virKeycodes); i++) {
- if (getfield(virKeycodes + i, unsigned short, from_offset) == key_value)
- return getfield(virKeycodes + i, unsigned short, to_offset);
+ if (name && STREQ_NULLABLE(name, keyname))
+ return virKeymapValues[codeset][i];
}
return -1;
}
+
int virKeycodeValueTranslate(virKeycodeSet from_codeset,
virKeycodeSet to_codeset,
int key_value)
{
- if (key_value <= 0)
- return -1;
+ int i;
- key_value = __virKeycodeValueTranslate(codeOffset[from_codeset],
- codeOffset[to_codeset],
- key_value);
if (key_value <= 0)
return -1;
- return key_value;
+
+ for (i = 0; i < VIR_KEYMAP_ENTRY_MAX; i++) {
+ if (virKeymapValues[from_codeset][i] == key_value)
+ return virKeymapValues[to_codeset][i];
+ }
+
+ return -1;
}
--
1.8.1.4
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