fixed compiler warnings

configure.ac

@@ -133,8 +133,8 @@ case "${host}" in
 	;;
 esac
 
-AX_CHECK_COMPILE_FLAG(-Wno-error=unused-but-set-variable, [have_unused_but_set_variable="yes"], [have_unused_but_set_variable="no"], [-Werror -Wunknown-warning-option])
+AX_CHECK_COMPILE_FLAG(-Wunknown-warning-option, [have_unknown_warning_option="yes"], [have_unknown_warning_option="no"], [-Werror])
-AM_CONDITIONAL([HAVE_UNUSED_BUT_SET_VARIABLE], [test "${have_unused_but_set_variable}" = "yes"])
+AM_CONDITIONAL([HAVE_UNKNOWN_WARNING_OPTION], [test "${have_unknown_warning_option}" = "yes"])
 
 AC_ARG_ENABLE(
 	[strict],

src/common/compat___iob_func.c

@@ -7,14 +7,20 @@
 #if defined(_MSC_VER) && (_MSC_VER >= 1900)
 // needed for OpenSSL static link
 // only for vs 2015 or later
+//
+// this is a horrible hack, the correct fix would be to recompile OpenSSL with
+// VS 2015 or later. However, since in OpenSC, we don't need OpenSSL to send
+// output to any of these buffers, we don't need to cope with runtime errors
+// induced by this hack. See https://stackoverflow.com/a/34655235 for details.
+//
 #pragma comment(lib, "legacy_stdio_definitions.lib")
 #include <stdio.h>
 FILE * __cdecl __iob_func(void)
 {
-   static FILE *my_iob[3];
+   static FILE my_iob[3];
-   my_iob[0] = stdin;
+   my_iob[0] = *stdin;
-   my_iob[1] = stdout;
+   my_iob[1] = *stdout;
-   my_iob[2] = stderr;
+   my_iob[2] = *stderr;
    return my_iob;
 }
 #endif

src/libopensc/card-cardos.c

@@ -559,8 +559,8 @@ static int cardos_set_file_attributes(sc_card_t *card, sc_file_t *file)
 
 		status[0] = 0x01;
 		if (file->type == SC_FILE_TYPE_DF) {
-			status[1] = file->size >> 8;
+			status[1] = (file->size >> 8) & 0xFF;
-			status[2] = file->size;
+			status[2] = file->size & 0xFF;
 		} else {
 			status[1] = status[2] = 0x00; /* not used */
 		}

src/libopensc/card-sc-hsm.c

@@ -805,15 +805,15 @@ static int sc_hsm_write_ef(sc_card_t *card,
 	*p++ = idx & 0xFF;
 	*p++ = 0x53;
 	if (count < 128) {
-		*p++ = count;
+		*p++ = (u8) count;
 		len = 6;
 	} else if (count < 256) {
 		*p++ = 0x81;
-		*p++ = count;
+		*p++ = (u8) count;
 		len = 7;
 	} else {
 		*p++ = 0x82;
-		*p++ = count >> 8;
+		*p++ = (count >> 8) & 0xFF;
 		*p++ = count & 0xFF;
 		len = 8;
 	}
@@ -1199,8 +1199,11 @@ static int sc_hsm_initialize(sc_card_t *card, sc_cardctl_sc_hsm_init_param_t *pa
 	memcpy(p, params->options, 2);
 	p += 2;
 
+	if (params->user_pin_len > 0xFF) {
+		return SC_ERROR_INVALID_ARGUMENTS;
+	}
 	*p++ = 0x81;	// User PIN
-	*p++ = params->user_pin_len;
+	*p++ = (u8) params->user_pin_len;
 	memcpy(p, params->user_pin, params->user_pin_len);
 	p += params->user_pin_len;
 

src/libopensc/ef-gdo.c

@@ -21,8 +21,9 @@
 #include "config.h"
 #endif
 
-#include "internal.h"
 #include "asn1.h"
+#include "internal.h"
+#include <stdlib.h>
 
 static int
 sc_parse_ef_gdo_content(const unsigned char *gdo, size_t gdo_len,

src/libopensc/iso7816.c

@@ -828,8 +828,10 @@ iso7816_set_security_env(struct sc_card *card,
 		*p++ = env->algorithm_ref & 0xFF;
 	}
 	if (env->flags & SC_SEC_ENV_FILE_REF_PRESENT) {
+		if (env->file_ref.len > 0xFF)
+			return SC_ERROR_INVALID_ARGUMENTS;
 		*p++ = 0x81;
-		*p++ = env->file_ref.len;
+		*p++ = (u8) env->file_ref.len;
 		assert(sizeof(sbuf) - (p - sbuf) >= env->file_ref.len);
 		memcpy(p, env->file_ref.value, env->file_ref.len);
 		p += env->file_ref.len;
@@ -839,7 +841,9 @@ iso7816_set_security_env(struct sc_card *card,
 			*p++ = 0x83;
 		else
 			*p++ = 0x84;
-		*p++ = env->key_ref_len;
+		if (env->key_ref_len > 0xFF)
+			return SC_ERROR_INVALID_ARGUMENTS;
+		*p++ = env->key_ref_len & 0xFF;
 		assert(sizeof(sbuf) - (p - sbuf) >= env->key_ref_len);
 		memcpy(p, env->key_ref, env->key_ref_len);
 		p += env->key_ref_len;

src/libopensc/reader-tr03119.c

@@ -494,7 +494,7 @@ static int escape_pin_cmd_to_buf(sc_context_t *ctx,
 		/* GLP PIN length is encoded in 4 bits and block size is always 8 bytes */
 		bmPINBlockString = 0x40 | 0x08;
 	} else if (pin_ref->encoding == SC_PIN_ENCODING_ASCII && data->flags & SC_PIN_CMD_NEED_PADDING) {
-		bmPINBlockString = pin_ref->pad_length;
+		bmPINBlockString = (uint8_t) pin_ref->pad_length;
 	} else {
 		bmPINBlockString = 0x00;
 	}
@@ -566,11 +566,11 @@ static int escape_pin_cmd_to_buf(sc_context_t *ctx,
 			modify->bmPINLengthFormat = bmPINLengthFormat;
 			if (!(data->flags & SC_PIN_CMD_IMPLICIT_CHANGE)
 					&& data->pin1.offset) {
-				modify->bInsertionOffsetOld = data->pin1.offset - 5;
+				modify->bInsertionOffsetOld = (uint8_t) data->pin1.offset - 5;
 			} else {
 				modify->bInsertionOffsetOld = 0;
 			}
-			modify->bInsertionOffsetNew = data->pin2.offset ? data->pin2.offset - 5 : 0;
+			modify->bInsertionOffsetNew = data->pin2.offset ? (uint8_t) data->pin2.offset - 5 : 0;
 			modify->wPINMaxExtraDigit = wPINMaxExtraDigit;
 			modify->bConfirmPIN = CCID_PIN_CONFIRM_NEW
 				| (data->flags & SC_PIN_CMD_IMPLICIT_CHANGE ? 0 : CCID_PIN_INSERT_OLD);

src/libopensc/sec.c

@@ -244,7 +244,7 @@ int sc_build_pin(u8 *buf, size_t buflen, struct sc_pin_cmd_pin *pin, int pad)
 			if (pin->data[i] < '0' || pin->data[i] > '9')
 				return SC_ERROR_INVALID_ARGUMENTS;
 		}
-		buf[0] = 0x20 | pin_len;
+		buf[0] = 0x20 | (u8) pin_len;
 		buf++;
 		buflen--;
 	}

src/minidriver/minidriver.c

@@ -2864,7 +2864,7 @@ static const char *md_get_ui_str(PCARD_DATA pCardData, enum ui_str id)
 	return str;
 }
 
-static INT_PTR CALLBACK md_dialog_proc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam, LONG_PTR dwRefData)
+static HRESULT CALLBACK md_dialog_proc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam, LONG_PTR dwRefData)
 {
 	LONG_PTR param;
 	int timeout;

src/pkcs11/framework-pkcs15.c

@@ -175,6 +175,7 @@ static const struct {
 const CK_BYTE gostr3411_94_cryptopro_paramset_encoded_oid[] = { 0x06, 0x07, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x1e, 0x01 };
 const unsigned int gostr3411_94_cryptopro_paramset_oid[] = {1, 2, 643, 2, 2, 30, 1, (unsigned int)-1};
 
+#ifdef USE_PKCS15_INIT
 static const struct {
 	const CK_BYTE *encoded_oid;
 	const unsigned int encoded_oid_size;
@@ -186,6 +187,7 @@ static const struct {
 		&gostr3411_94_cryptopro_paramset_oid[0],
 		sizeof(gostr3411_94_cryptopro_paramset_oid)}
 };
+#endif
 
 static int	__pkcs15_release_object(struct pkcs15_any_object *);
 static CK_RV	register_mechanisms(struct sc_pkcs11_card *p11card);
@@ -978,7 +980,7 @@ pkcs15_add_object(struct sc_pkcs11_slot *slot, struct pkcs15_any_object *obj,
 	unsigned int i;
 	struct pkcs15_fw_data *card_fw_data;
 	CK_OBJECT_HANDLE handle =
-		(CK_OBJECT_HANDLE)obj; /* cast pointer to long, will truncate on Win64 */
+		(CK_OBJECT_HANDLE)(uintptr_t)obj; /* cast pointer to long, will truncate on Win64 */
 
 	if (obj == NULL || slot == NULL)
 		return;

src/sm/sm-eac.c

@@ -1684,8 +1684,9 @@ static int npa_gen_auth_ca(sc_card_t *card, const BUF_MEM *eph_pub_key,
 	}
 	c_data->eph_pub_key = ASN1_OCTET_STRING_new();
 	if (!c_data->eph_pub_key
-			|| !ASN1_OCTET_STRING_set( c_data->eph_pub_key,
+			|| !ASN1_OCTET_STRING_set(c_data->eph_pub_key,
-				eph_pub_key->data, eph_pub_key->length)) {
+				(const unsigned char *) eph_pub_key->data,
+				eph_pub_key->length)) {
 		ssl_error(card->ctx);
 		r = SC_ERROR_INTERNAL;
 		goto err;

src/sm/sm-iso.c

@@ -156,15 +156,15 @@ static int format_le(size_t le, struct sc_asn1_entry *le_entry,
 
 	switch (*le_len) {
 		case 1:
-			p[0] = le;
+			p[0] = le & 0xff;
 			break;
 		case 2:
-			p[0] = le >> 8;
+			p[0] = (le >> 8) & 0xff;
 			p[1] = le & 0xff;
 			break;
 		case 3:
 			p[0] = 0x00;
-			p[1] = le >> 8;
+			p[1] = (le >> 8) & 0xff;
 			p[2] = le & 0xff;
 			break;
 		default:

src/tools/Makefile.am

@@ -113,7 +113,10 @@ npa-tool.1:
 opensc_notify_SOURCES = opensc-notify.c $(OPENSC_NOTIFY_BUILT_SOURCES)
 opensc_notify_LDADD = $(top_builddir)/src/libopensc/libopensc.la $(OPTIONAL_NOTIFY_LIBS)
 opensc_notify_CFLAGS = -I$(top_srcdir)/src $(OPTIONAL_NOTIFY_CFLAGS)
-opensc_notify_CFLAGS += -Wno-unused-but-set-variable -Wno-unknown-warning-option
+opensc_notify_CFLAGS += -Wno-unused-but-set-variable
+if HAVE_UNKNOWN_WARNING_OPTION
+opensc_notify_CFLAGS += -Wno-unknown-warning-option
+endif
 
 opensc-notify.c: $(abs_builddir)/opensc-notify.ggo $(OPENSC_NOTIFY_BUILT_SOURCES)
 
@@ -137,7 +140,10 @@ opensc-notify.1:
 egk_tool_SOURCES = egk-tool.c $(EGK_TOOL_BUILT_SOURCES)
 egk_tool_LDADD = $(top_builddir)/src/libopensc/libopensc.la $(OPTIONAL_ZLIB_LIBS)
 egk_tool_CFLAGS = -I$(top_srcdir)/src $(OPTIONAL_ZLIB_CFLAGS)
-egk_tool_CFLAGS += -Wno-unused-but-set-variable -Wno-unknown-warning-option
+egk_tool_CFLAGS += -Wno-unused-but-set-variable
+if HAVE_UNKNOWN_WARNING_OPTION
+egk_tool_CFLAGS += -Wno-unknown-warning-option
+endif
 
 egk-tool.c: $(abs_builddir)/egk-tool.ggo $(EGK_TOOL_BUILT_SOURCES)
 

src/tools/cardos-tool.c

@@ -1027,7 +1027,7 @@ static int cardos_change_startkey(const char *change_startkey_apdu)   {
 }
 #endif
 
-int main(int argc, char *const argv[])
+int main(int argc, char *argv[])
 {
 	int err = 0, r, c, long_optind = 0;
 	int do_info = 0;

src/tools/cryptoflex-tool.c

@@ -978,7 +978,7 @@ static int create_pin(void)
 	return create_pin_file(&path, opt_pin_num, "");
 }
 
-int main(int argc, char * const argv[])
+int main(int argc, char *argv[])
 {
 	int err = 0, r, c, long_optind = 0;
 	int action_count = 0;

src/tools/egk-tool.c

@@ -60,8 +60,8 @@ int uncompress_gzip(void* uncompressed, size_t *uncompressed_len,
 	return SC_SUCCESS;
 }
 #else
-int uncompress_gzip(const void* compressed, size_t compressed_len,
+int uncompress_gzip(void* uncompressed, size_t *uncompressed_len,
-	   	void* uncompressed, size_t *uncompressed_len)
+		const void* compressed, size_t compressed_len)
 {
 	return SC_ERROR_NOT_SUPPORTED;
 }
@@ -196,7 +196,7 @@ main (int argc, char **argv)
 	struct gengetopt_args_info cmdline;
 	struct sc_path path;
 	struct sc_context *ctx;
-	struct sc_reader *reader;
+	struct sc_reader *reader = NULL;
 	struct sc_card *card;
 	unsigned char *data = NULL;
 	size_t data_len = 0;

src/tools/eidenv.c

@@ -23,6 +23,8 @@
 #include <stdio.h>
 #ifndef _WIN32
 #include <unistd.h>
+#else
+#include <process.h>
 #endif
 #include <stdlib.h>
 #include <string.h>

src/tools/gids-tool.c

@@ -466,7 +466,7 @@ static int print_info(sc_card_t *card) {
 	return SC_SUCCESS;
 }
 
-int main(int argc, char * const argv[])
+int main(int argc, char * argv[])
 {
 	int err = 0, r, c, long_optind = 0;
 	int action_count = 0;

src/tools/iasecc-tool.c

@@ -197,7 +197,7 @@ static int list_apps(FILE *fout)
 	return 0;
 }
 
-int main(int argc, char * const argv[])
+int main(int argc, char *argv[])
 {
 	int err = 0, r, c, long_optind = 0;
 	int do_list_sdos = 0;

src/tools/opensc-explorer.c

@@ -1867,7 +1867,7 @@ static char *read_cmdline(FILE *script, char *prompt)
 	return buf;
 }
 
-int main(int argc, char * const argv[])
+int main(int argc, char *argv[])
 {
 	int r, c, long_optind = 0, err = 0;
 	char *line;

src/tools/opensc-notify.c

@@ -173,7 +173,6 @@ WinMain(HINSTANCE hInstance, HINSTANCE prevInstance, LPSTR lpCmdLine, int nShowC
 	LPWSTR *wargv = NULL;
 	char **argv = NULL;
 	int argc = 0, i;
-	struct gengetopt_args_info cmdline;
 
 	wargv = CommandLineToArgvW(GetCommandLineW(), &argc);
 	if (wargv == NULL) {

src/tools/opensc-tool.c

@@ -668,7 +668,7 @@ static int card_reset(const char *reset_type)
 	return 0;
 }
 
-int main(int argc, char * const argv[])
+int main(int argc, char *argv[])
 {
 	int err = 0, r, c, long_optind = 0;
 	int do_info = 0;

src/tools/piv-tool.c

@@ -459,7 +459,7 @@ static void print_serial(sc_card_t *in_card)
 		util_hex_dump_asc(stdout, serial.value, serial.len, -1);
 }
 
-int main(int argc, char * const argv[])
+int main(int argc, char *argv[])
 {
 	int err = 0, r, c, long_optind = 0;
 	int do_send_apdu = 0;

src/tools/pkcs15-crypt.c

@@ -352,7 +352,7 @@ static int get_key(unsigned int usage, sc_pkcs15_object_t **result)
 	return 0;
 }
 
-int main(int argc, char * const argv[])
+int main(int argc, char *argv[])
 {
 	int err = 0, r, c, long_optind = 0;
 	int do_decipher = 0;

src/tools/pkcs15-tool.c

@@ -2031,7 +2031,7 @@ end:
 	return 0;
 }
 
-int main(int argc, char * const argv[])
+int main(int argc, char *argv[])
 {
 	int err = 0, r, c, long_optind = 0;
 	int do_read_cert = 0;

src/tools/sc-hsm-tool.c

@@ -1654,7 +1654,7 @@ static int unwrap_key(sc_card_t *card, int keyid, const char *inf, const char *p
 
 
 
-int main(int argc, char * const argv[])
+int main(int argc, char *argv[])
 {
 	int err = 0, r, c, long_optind = 0;
 	int action_count = 0;

src/ui/strings.c

@@ -20,8 +20,9 @@
 
 #include "libopensc/internal.h"
 #include "ui/strings.h"
-#include <string.h>
 #include <locale.h>
+#include <stdlib.h>
+#include <string.h>
 
 enum ui_langs {
 	EN,