Flesh out toy envvar config parser

1 files changed, 52 insertions, 16 deletions

diff --git a/sandbox/envvar/envvar.c b/sandbox/envvar/envvar.c
index bbcb1c9..8ef3013 100644
--- a/sandbox/envvar/envvar.c
+++ b/sandbox/envvar/envvar.c
@@ -1,24 +1,57 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 
 int main(int argc, char *argv[])
 {
-	const char* pg_dbname = getenv("POSTGRES_DBNAME");
-	const char* pg_host = getenv("POSTGRES_HOST");
-	const char* pg_password = getenv("POSTGRES_PASSWORD");
-	const char* pg_port = getenv("POSTGRES_PORT");
-	const char* pg_user = getenv("POSTGRES_USER");
-
-	printf("POSTGRES_DBNAME: %s\n", (pg_dbname != NULL) ? pg_dbname : "undefined");
-	printf("POSTGRES_HOST: %s\n", (pg_host != NULL) ? pg_host : "undefined");
-	printf("POSTGRES_PASSWORD: %s\n", (pg_password != NULL) ? pg_password : "undefined");
-	printf("POSTGRES_PORT: %s\n", (pg_port != NULL) ? pg_port : "undefined");
-	printf("POSTGRES_USER: %s\n", (pg_user != NULL) ? pg_user : "undefined");
-
-	char *config = "host=%s port=%s user=%s password=%s dbname=%s sslmode=disable\n";
-
-	sprintf(
-		config,
+	char pg_dbname[128] = {0};
+	char pg_host[128] = {0};
+	char pg_password[128] = {0};
+	char pg_port[8] = {0};
+	char pg_user[128] = {0};
+
+	const char* env;
+
+	env = getenv("POSTGRES_DBNAME");
+	if (env != NULL)
+	{
+		strncpy(pg_dbname, env, sizeof(pg_dbname));
+	}
+
+	env = getenv("POSTGRES_HOST");
+	if (env != NULL)
+	{
+		strncpy(pg_host, env, sizeof(pg_host));
+	}
+
+	env = getenv("POSTGRES_PASSWORD");
+	if (env != NULL)
+	{
+		strncpy(pg_password, env, sizeof(pg_password));
+	}
+
+	env = getenv("POSTGRES_PORT");
+	if (env != NULL)
+	{
+		strncpy(pg_port, env, sizeof(pg_port));
+	}
+
+	env = getenv("POSTGRES_USER");
+	if (env != NULL)
+	{
+		strncpy(pg_user, env, sizeof(pg_user));
+	}
+
+	char *config_fmt = "host=%s port=%s user=%s password=%s dbname=%s sslmode=disable";
+
+	printf(config_fmt, pg_host, pg_port, pg_user, pg_password, pg_dbname);
+	printf("\n");
+
+	char sqladdr[2048];
+	snprintf(
+		sqladdr,
+		sizeof(sqladdr),
+		config_fmt,
 		pg_host,
 		pg_port,
 		pg_user,
@@ -26,4 +59,7 @@ int main(int argc, char *argv[])
 		pg_dbname
 	);
 
+	printf("%s", sqladdr);
+	printf("\n");
+
 }