[Qemu-devel] [PATCH 24/26] libcacard: move atr setting from macro to function

[Alon Levy <alevy@redhat.com>]

Only because qemu's checkpatch complains about it.

Signed-off-by: Alon Levy <alevy@redhat.com>
---
 Makefile.objs              |  1 +
 libcacard/vcard_emul_nss.c | 11 ++++++++---
 libcacard/vcardt.c         | 40 ++++++++++++++++++++++++++++++++++++++++
 libcacard/vcardt.h         | 15 ++-------------
 4 files changed, 51 insertions(+), 16 deletions(-)
 create mode 100644 libcacard/vcardt.c

diff --git a/Makefile.objs b/Makefile.objs
index f99841c..6d47567 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -41,6 +41,7 @@ libcacard-y += libcacard/vcard.o libcacard/vreader.o
 libcacard-y += libcacard/vcard_emul_nss.o
 libcacard-y += libcacard/vcard_emul_type.o
 libcacard-y += libcacard/card_7816.o
+libcacard-y += libcacard/vcardt.o
 
 ######################################################################
 # Target independent part of system emulation. The long term path is to
diff --git a/libcacard/vcard_emul_nss.c b/libcacard/vcard_emul_nss.c
index 21d4689..6bad0b9 100644
--- a/libcacard/vcard_emul_nss.c
+++ b/libcacard/vcard_emul_nss.c
@@ -519,18 +519,23 @@ vcard_emul_reader_get_slot(VReader *vreader)
 }
 
 /*
- *  Card ATR's map to physical cards. VCARD_ATR_PREFIX will set appropriate
+ *  Card ATR's map to physical cards. vcard_alloc_atr will set appropriate
  *  historical bytes for any software emulated card. The remaining bytes can be
  *  used to indicate the actual emulator
  */
-static const unsigned char nss_atr[] = { VCARD_ATR_PREFIX(3), 'N', 'S', 'S' };
+static unsigned char *nss_atr;
+static int nss_atr_len;
 
 void
 vcard_emul_get_atr(VCard *card, unsigned char *atr, int *atr_len)
 {
-    int len = MIN(sizeof(nss_atr), *atr_len);
+    int len;
     assert(atr != NULL);
 
+    if (nss_atr == NULL) {
+        nss_atr = vcard_alloc_atr("NSS", &nss_atr_len);
+    }
+    len = MIN(nss_atr_len, *atr_len);
     memcpy(atr, nss_atr, len);
     *atr_len = len;
 }
diff --git a/libcacard/vcardt.c b/libcacard/vcardt.c
new file mode 100644
index 0000000..f64c343
--- /dev/null
+++ b/libcacard/vcardt.c
@@ -0,0 +1,40 @@
+#include <stdlib.h>
+#include <string.h>
+#include <glib.h>
+
+#include "libcacard/vcardt.h"
+
+/* create an ATR with appropriate historical bytes */
+#define ATR_TS_DIRECT_CONVENTION 0x3b
+#define ATR_TA_PRESENT 0x10
+#define ATR_TB_PRESENT 0x20
+#define ATR_TC_PRESENT 0x40
+#define ATR_TD_PRESENT 0x80
+
+unsigned char *vcard_alloc_atr(const char *postfix, int *atr_len)
+{
+    int postfix_len;
+    const char prefix[] = "VCARD_";
+    const int prefix_len = strlen(prefix);
+    int total_len;
+    unsigned char *atr;
+
+    if (postfix == NULL) {
+        postfix_len = 0;
+    } else {
+        postfix_len = strlen(postfix);
+    }
+    total_len = 3 + prefix_len + postfix_len;
+    atr = g_malloc(total_len);
+    atr[0] = ATR_TS_DIRECT_CONVENTION;
+    atr[1] = ATR_TD_PRESENT + prefix_len + postfix_len;
+    atr[2] = 0x00;
+    memcpy(&atr[3], prefix, prefix_len);
+    if (postfix) {
+        memcpy(&atr[3 + prefix_len], postfix, postfix_len);
+    }
+    if (atr_len) {
+        *atr_len = total_len;
+    }
+    return atr;
+}
diff --git a/libcacard/vcardt.h b/libcacard/vcardt.h
index 3b9a619..e8e651f 100644
--- a/libcacard/vcardt.h
+++ b/libcacard/vcardt.h
@@ -25,19 +25,6 @@ typedef struct VCardEmulStruct VCardEmul;
 
 #define MAX_CHANNEL 4
 
-/* create an ATR with appropriate historical bytes */
-#define TS_DIRECT_CONVENTION 0x3b
-#define TA_PRESENT 0x10
-#define TB_PRESENT 0x20
-#define TC_PRESENT 0x40
-#define TD_PRESENT 0x80
-
-#define VCARD_ATR_PREFIX(size) \
-    TS_DIRECT_CONVENTION, \
-    TD_PRESENT + (6 + size), \
-    0x00, \
-    'V', 'C', 'A', 'R', 'D', '_'
-
 typedef enum {
     VCARD_DONE,
     VCARD_NEXT,
@@ -69,4 +56,6 @@ struct VCardBufferResponseStruct {
     int len;
 };
 
+unsigned char *vcard_alloc_atr(const char *postfix, int *atr_len);
+
 #endif
-- 
1.8.1.4