icetime: Add support for searching for chipdb relative to binary

Like yosys and arachne-pnr, allow for searching for the desired chipdb
file relative to the executing binaries directory. This allows for
portable builds of icetime without needing to specify the exact path to
the needed chipdb file with the -C arg.

In order to support this icetime must be able to get the
"proc_self_dirname" path just like yosys and arachne-pnr. As such copy
the equivalent code to get this path information. To avoid cluttering
the icetime.cc file with this code, place it in a separate iceutil.cc
file.

Signed-off-by: Nathan Rossi <nathan@nathanrossi.com>

1 files changed, 9 insertions, 24 deletions

diff --git a/icetime/icetime.cc b/icetime/icetime.cc
index 35ce99a..16ad142 100644
--- a/icetime/icetime.cc
+++ b/icetime/icetime.cc
@@ -38,6 +38,8 @@
 #include <emscripten.h>
 #endif
 
+std::string find_chipdb(std::string config_device);
+
 // add this number of ns as estimate for clock distribution mismatch
 #define GLOBAL_CLK_DIST_JITTER 0.1
 
@@ -322,35 +324,18 @@ void read_config()
 void read_chipdb()
 {
 	char buffer[1024];
+	std::string filepath = chipdbfile;
 
-	if (!chipdbfile.empty()) {
-		snprintf(buffer, 1024, "%s", chipdbfile.c_str());
-	} else
-	if (PREFIX[0] == '~' && PREFIX[1] == '/') {
-		std::string homedir;
-#ifdef _WIN32
-		if (getenv("USERPROFILE") != nullptr) {
-			homedir += getenv("USERPROFILE");
-		}
-		else {
-			if (getenv("HOMEDRIVE") != nullptr &&
-			    getenv("HOMEPATH") != nullptr) {
-				homedir += getenv("HOMEDRIVE");
-				homedir += getenv("HOMEPATH");
-			}
-		}
-#else
-		homedir += getenv("HOME");
-#endif
-		snprintf(buffer, 1024, "%s%s/share/" CHIPDB_SUBDIR "/chipdb-%s.txt", homedir.c_str(), PREFIX+1, config_device.c_str());
-	} else {
-		snprintf(buffer, 1024, PREFIX "/share/" CHIPDB_SUBDIR "/chipdb-%s.txt", config_device.c_str());
+	if (filepath.empty())
+		filepath = find_chipdb(config_device);
+	if (filepath.empty()) {
+		fprintf(stderr, "Can't find chipdb file for device %s\n", config_device.c_str());
+		exit(1);
 	}
 
-	FILE *fdb = fopen(buffer, "r");
+	FILE *fdb = fopen(filepath.c_str(), "r");
 	if (fdb == nullptr) {
 		perror("Can't open chipdb file");
-		fprintf(stderr, "  %s\n", buffer);
 		exit(1);
 	}