toy to load config from env vars

2 files changed, 44 insertions, 0 deletions

diff --git a/sandbox/envvar/Makefile b/sandbox/envvar/Makefile
new file mode 100644
index 0000000..ae4c74e
--- /dev/null
+++ b/sandbox/envvar/Makefile
@@ -0,0 +1,15 @@
+.PHONY: run clean
+
+CC = gcc
+CFLAGS = -g -Wall -Wmissing-declarations -Wshadow -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wcast-qual -Wsign-compare
+
+all: envvar
+
+envvar: envvar.c
+	$(CC) $(CFLAGS) -std=c99 -pedantic -o envvar envvar.c
+
+run:
+	./envvar
+
+clean:
+	rm envvar
diff --git a/sandbox/envvar/envvar.c b/sandbox/envvar/envvar.c
new file mode 100644
index 0000000..bbcb1c9
--- /dev/null
+++ b/sandbox/envvar/envvar.c
@@ -0,0 +1,29 @@
+#include <stdio.h>
+#include <stdlib.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,
+		pg_host,
+		pg_port,
+		pg_user,
+		pg_password,
+		pg_dbname
+	);
+
+}