Fix compiler warnings related to 'const'

examples/iscsiclient.c

@@ -52,7 +52,7 @@ WSADATA wsaData;
 
 struct client_state {
        int finished;
-       char *message;
+       const char *message;
        int has_discovered_target;
        char *target_name;
        char *target_address;

src/iscsi-inq.c

@@ -24,8 +24,11 @@
 #include "iscsi.h"
 #include "scsi-lowlevel.h"
 
-const char *initiator = "iqn.2007-10.com.github:sahlberg:libiscsi:iscsi-inq";
+#ifndef discard_const
+#define discard_const(ptr) ((void *)((intptr_t)(ptr)))
+#endif
 
+const char *initiator = "iqn.2007-10.com.github:sahlberg:libiscsi:iscsi-inq";
 
 void inquiry_block_limits(struct scsi_inquiry_block_limits *inq)
 {
@@ -216,7 +219,7 @@ int main(int argc, const char *argv[])
 	struct iscsi_context *iscsi;
 	const char **extra_argv;
 	int extra_argc = 0;
-	char *url = NULL;
+	const char *url = NULL;
 	struct iscsi_url *iscsi_url = NULL;
 	int evpd = 0, pagecode = 0;
 	int show_help = 0, show_usage = 0, debug = 0;
@@ -277,8 +280,10 @@ int main(int argc, const char *argv[])
 	}
 	iscsi_url = iscsi_parse_full_url(iscsi, url);
 	
-	if (url) free(url);
-	
+	if (url) {
+		free(discard_const(url));
+	}
+
 	if (iscsi_url == NULL) {
 		fprintf(stderr, "Failed to parse URL: %s\n", 
 			iscsi_get_error(iscsi));

src/iscsi-ls.c

@@ -24,6 +24,10 @@
 #include "iscsi.h"
 #include "scsi-lowlevel.h"
 
+#ifndef discard_const
+#define discard_const(ptr) ((void *)((intptr_t)(ptr)))
+#endif
+
 int showluns;
 const char *initiator = "iqn.2007-10.com.github:sahlberg:libiscsi:iscsi-ls";
 
@@ -312,7 +316,7 @@ int main(int argc, const char *argv[])
 	struct client_state state;
 	const char **extra_argv;
 	int extra_argc = 0;
-	char *url = NULL;
+	const char *url = NULL;
 	poptContext pc;
 	int res;
 	int show_help = 0, show_usage = 0, debug = 0;
@@ -374,8 +378,10 @@ int main(int argc, const char *argv[])
 
 	iscsi_url = iscsi_parse_portal_url(iscsi, url);
 	
-	if (url) free(url);
-	
+	if (url) {
+		free(discard_const(url));
+	}
+
 	if (iscsi_url == NULL) {
 		fprintf(stderr, "Failed to parse URL: %s\n", 
 			iscsi_get_error(iscsi));

src/iscsi-readcapacity16.c

@@ -26,6 +26,10 @@
 #include "iscsi.h"
 #include "scsi-lowlevel.h"
 
+#ifndef discard_const
+#define discard_const(ptr) ((void *)((intptr_t)(ptr)))
+#endif
+
 const char *initiator = "iqn.2007-10.com.github:sahlberg:libiscsi:iscsi-readcapacity16";
 
 void print_usage(void)
@@ -58,7 +62,7 @@ int main(int argc, const char *argv[])
 	struct iscsi_context *iscsi;
 	const char **extra_argv;
 	int extra_argc = 0;
-	char *url = NULL;
+	const char *url = NULL;
 	struct iscsi_url *iscsi_url = NULL;
 	int show_help = 0, show_usage = 0, debug = 0, size_only=0;
 	int res;
@@ -119,8 +123,10 @@ int main(int argc, const char *argv[])
 	}
 	iscsi_url = iscsi_parse_full_url(iscsi, url);
 	
-	if (url) free(url);
-	
+	if (url) {
+		free(discard_const(url));
+	}
+
 	if (iscsi_url == NULL) {
 		fprintf(stderr, "Failed to parse URL: %s\n", 
 			iscsi_get_error(iscsi));

test-tool/iscsi-test.c

@@ -34,6 +34,10 @@
 #include "iscsi-private.h"
 #include "iscsi-test.h"
 
+#ifndef discard_const
+#define discard_const(ptr) ((void *)((intptr_t)(ptr)))
+#endif
+
 const char *initiatorname1 = "iqn.2007-10.com.github:sahlberg:libiscsi:iscsi-test";
 const char *initiatorname2 = "iqn.2007-10.com.github:sahlberg:libiscsi:iscsi-test-2";
 
@@ -478,7 +482,7 @@ int main(int argc, const char *argv[])
 
 	free(skipname);
 	free(testname);
-	free(url);
+	free(discard_const(url));
 
 	return num_failed ? num_failed : num_skipped ? 77 : 0;
 }