Enable more C tests

integration_tests/CMakeLists.txt

@@ -165,15 +165,15 @@ RUN(NAME expr_05             LABELS cpython llvm c)
 RUN(NAME expr_06             LABELS cpython llvm c)
 RUN(NAME expr_07             LABELS cpython llvm c)
 RUN(NAME expr_08             LABELS llvm c)
-RUN(NAME expr_09             LABELS cpython llvm)
+RUN(NAME expr_09             LABELS cpython llvm c)
 RUN(NAME expr_10             LABELS cpython llvm c)
 RUN(NAME expr_11             LABELS cpython llvm c wasm)
 RUN(NAME expr_12             LABELS llvm c)
 RUN(NAME expr_13             LABELS llvm c
         EXTRAFILES expr_13b.c)
 RUN(NAME loop_01             LABELS cpython llvm c)
 RUN(NAME print_02            LABELS cpython llvm)
-RUN(NAME test_types_01       LABELS cpython llvm)
+RUN(NAME test_types_01       LABELS cpython llvm c)
 RUN(NAME test_str_01         LABELS cpython llvm c)
 RUN(NAME test_str_02         LABELS cpython llvm c)
 RUN(NAME test_str_03         LABELS cpython llvm c)
@@ -222,7 +222,7 @@ RUN(NAME test_builtin_abs    LABELS cpython llvm c)
 RUN(NAME test_builtin_bool   LABELS cpython llvm c)
 RUN(NAME test_builtin_pow    LABELS cpython llvm)
 RUN(NAME test_builtin_int    LABELS cpython llvm c)
-RUN(NAME test_builtin_len    LABELS cpython llvm)
+RUN(NAME test_builtin_len    LABELS cpython llvm c)
 RUN(NAME test_builtin_str    LABELS cpython llvm c)
 RUN(NAME test_builtin_oct    LABELS cpython llvm c)
 RUN(NAME test_builtin_hex    LABELS cpython llvm c)
@@ -293,7 +293,7 @@ RUN(NAME generics_array_02   LABELS cpython llvm)
 RUN(NAME generics_array_03   LABELS cpython llvm)
 RUN(NAME generics_list_01    LABELS cpython llvm)
 RUN(NAME test_statistics     LABELS cpython llvm)
-RUN(NAME test_str_attributes LABELS cpython llvm)
+RUN(NAME test_str_attributes LABELS cpython llvm c)
 RUN(NAME kwargs_01           LABELS cpython llvm)
 RUN(NAME test_01_goto        LABELS cpython llvm c)
 

src/libasr/codegen/asr_to_c_cpp.h

@@ -566,7 +566,11 @@ R"(#include <stdio.h>
 
     void visit_StringOrd(const ASR::StringOrd_t& x) {
         self().visit_expr(*x.m_arg);
-        src = "(int)" + src + "[0]";
+        if (ASR::is_a<ASR::StringConstant_t>(*x.m_arg)) {
+            src = "(int)" + src + "[0]";
+        } else {
+            src = "_lfortran_str_ord_c(" + src + ")";
+        }
     }
 
     void visit_StringRepeat(const ASR::StringRepeat_t &x) {

src/libasr/runtime/lfortran_intrinsics.c

@@ -873,6 +873,11 @@ LFORTRAN_API int _lfortran_str_ord(char** s)
     return (*s)[0];
 }
 
+LFORTRAN_API int _lfortran_str_ord_c(char* s)
+{
+    return s[0];
+}
+
 LFORTRAN_API char* _lfortran_str_chr(int val)
 {
     char* dest_char = (char*)malloc(2);

src/libasr/runtime/lfortran_intrinsics.h

@@ -159,6 +159,7 @@ LFORTRAN_API char* _lfortran_strrepeat_c(char* s, int32_t n);
 LFORTRAN_API void _lfortran_strcat(char** s1, char** s2, char** dest);
 LFORTRAN_API int _lfortran_str_len(char** s);
 LFORTRAN_API int _lfortran_str_ord(char** s);
+LFORTRAN_API int _lfortran_str_ord_c(char* s);
 LFORTRAN_API char* _lfortran_str_chr(int c);
 LFORTRAN_API int _lfortran_str_to_int(char** s);
 LFORTRAN_API char* _lfortran_malloc(int size);

src/runtime/lpython_builtin.py

@@ -641,7 +641,7 @@ def _lpython_str_lower(x: str) -> str:
 def _lpython_str_find(s: str, sub: str) -> i32:
     s_len :i32; sub_len :i32; flag: bool; _len: i32;
     res: i32; i: i32;
-    lps: list[i32]
+    lps: list[i32] = []
     s_len = len(s)
     sub_len = len(sub)
     flag = False