take source file name as cli arguments

6 files changed, 46 insertions, 6 deletions

diff --git a/justfile b/justfile
index 86a53e3..016fa19 100644
--- a/justfile
+++ b/justfile
@@ -10,7 +10,7 @@ build N="1":
         else
             prev=$(({{N}} - 1))
         fi
-        "./ducc${prev}" < main.c > main{{N}}.s
+        "./ducc${prev}" main.c > main{{N}}.s
         gcc -s -Wl,-z,noexecstack -o ducc{{N}} main{{N}}.s
     fi
 
diff --git a/main.c b/main.c
index ffc0dd3..9ce3e81 100644
--- a/main.c
+++ b/main.c
@@ -10,7 +10,9 @@ extern FILE* stderr;
 int atoi(const char*);
 void* calloc(size_t, size_t);
 void exit(int);
+int fclose(FILE*);
 char* fgets(char*, int, FILE*);
+FILE* fopen(const char*, const char*);
 int getchar(void);
 int isalnum(int);
 int isalpha(int);
@@ -2182,8 +2184,17 @@ void codegen(Program* prog) {
     }
 }
 
-int main() {
-    char* source = read_all(stdin);
+int main(int argc, char** argv) {
+    if (argc == 1) {
+        fatal_error("usage: ducc <FILE>");
+    }
+    FILE* in;
+    if (strcmp(argv[1], "-") == 0) {
+        in = stdin;
+    } else {
+        in = fopen(argv[1], "rb");
+    }
+    char* source = read_all(in);
     Token* tokens = tokenize(source);
     Program* prog = parse(tokens);
     analyze(prog);
diff --git a/tests/050.sh b/tests/050.sh
new file mode 100644
index 0000000..295ac2d
--- /dev/null
+++ b/tests/050.sh
@@ -0,0 +1,29 @@
+set -e
+
+cat <<'EOF' > expected
+hello, world
+EOF
+
+cat <<'EOF' > main.c
+int printf();
+int main() {
+    printf("hello, world\n");
+    return 0;
+}
+EOF
+
+"$ducc" - < main.c > main.s
+if [[ $? -ne 0 ]]; then
+    cat main.s >&2
+    exit 1
+fi
+gcc -Wl,-z,noexecstack -o a.out main.s
+./a.out "$@" > output
+exit_code=$?
+
+if [[ $exit_code -ne 0 ]]; then
+    echo "invalid exit code: $exit_code" >&2
+    exit 1
+fi
+
+diff -u expected output
diff --git a/tests/test_diff.sh b/tests/test_diff.sh
index 8e938de..6520b42 100644
--- a/tests/test_diff.sh
+++ b/tests/test_diff.sh
@@ -1,6 +1,6 @@
 cat > main.c
 
-"$ducc" < main.c > main.s
+"$ducc" main.c > main.s
 if [[ $? -ne 0 ]]; then
     cat main.s >&2
     exit 1
diff --git a/tests/test_exit_code.sh b/tests/test_exit_code.sh
index 490de5b..44d1e06 100644
--- a/tests/test_exit_code.sh
+++ b/tests/test_exit_code.sh
@@ -1,6 +1,6 @@
 cat > main.c
 
-"$ducc" < main.c > main.s
+"$ducc" main.c > main.s
 if [[ $? -ne 0 ]]; then
     cat main.s >&2
     exit 1
diff --git a/tests/test_output.sh b/tests/test_output.sh
index 2f8b984..575e399 100644
--- a/tests/test_output.sh
+++ b/tests/test_output.sh
@@ -1,6 +1,6 @@
 cat > main.c
 
-"$ducc" < main.c > main.s
+"$ducc" main.c > main.s
 if [[ $? -ne 0 ]]; then
     cat main.s >&2
     exit 1