libsepol/cil: Create common string-to-unsigned-integer functions

The functions cil_fill_integer() and cil_fill_integer64() exist in
cil_build_ast.c, but these functions take a node and it would be
better to have a function that can be used in add_hll_linemark()
so that the common functinality is in one place.

Create cil_string_to_uint32() and cil_string_to_uint64() and use
these functions in cil_fill_integer(), cil_fill_integer64(), and
add_hll_linemark().

Signed-off-by: James Carter <jwcart2@gmail.com>

libsepol/cil/src/cil.c

@@ -1997,6 +1997,63 @@ exit:
 	return SEPOL_ERR;	
 }
 
+int cil_string_to_uint32(const char *string, uint32_t *value, int base)
+{
+	unsigned long val;
+	char *end = NULL;
+	int rc = SEPOL_ERR;
+
+	if (string == NULL || value  == NULL) {
+		goto exit;
+	}
+
+	errno = 0;
+	val = strtoul(string, &end, base);
+	if (errno != 0 || end == string || *end != '\0') {
+		rc = SEPOL_ERR;
+		goto exit;
+	}
+
+	/* Ensure that the value fits a 32-bit integer without triggering -Wtype-limits */
+#if ULONG_MAX > UINT32_MAX
+	if (val > UINT32_MAX) {
+		rc = SEPOL_ERR;
+		goto exit;
+	}
+#endif
+
+	*value = val;
+
+	return SEPOL_OK;
+
+exit:
+	cil_log(CIL_ERR, "Failed to create uint32_t from string\n");
+	return rc;
+}
+
+int cil_string_to_uint64(const char *string, uint64_t *value, int base)
+{
+	char *end = NULL;
+	int rc = SEPOL_ERR;
+
+	if (string == NULL || value  == NULL) {
+		goto exit;
+	}
+
+	errno = 0;
+	*value = strtoull(string, &end, base);
+	if (errno != 0 || end == string || *end != '\0') {
+		rc = SEPOL_ERR;
+		goto exit;
+	}
+
+	return SEPOL_OK;
+
+exit:
+	cil_log(CIL_ERR, "Failed to create uint64_t from string\n");
+	return rc;
+}
+
 void cil_sort_init(struct cil_sort **sort)
 {
 	*sort = cil_malloc(sizeof(**sort));

libsepol/cil/src/cil_build_ast.c

@@ -5601,60 +5601,40 @@ void cil_destroy_ipaddr(struct cil_ipaddr *ipaddr)
 int cil_fill_integer(struct cil_tree_node *int_node, uint32_t *integer, int base)
 {
 	int rc = SEPOL_ERR;
-	char *endptr = NULL;
-	unsigned long val;
 
 	if (int_node == NULL || int_node->data == NULL || integer == NULL) {
 		goto exit;
 	}
 
-	errno = 0;
+	rc = cil_string_to_uint32(int_node->data, integer, base);
-	val = strtoul(int_node->data, &endptr, base);
+	if (rc != SEPOL_OK) {
-	if (errno != 0 || endptr == int_node->data || *endptr != '\0') {
-		rc = SEPOL_ERR;
 		goto exit;
 	}
 
-	/* Ensure that the value fits a 32-bit integer without triggering -Wtype-limits */
-#if ULONG_MAX > UINT32_MAX
-	if (val > UINT32_MAX) {
-		rc = SEPOL_ERR;
-		goto exit;
-	}
-#endif
-
-	*integer = val;
-
 	return SEPOL_OK;
 
 exit:
-	cil_log(CIL_ERR, "Failed to create integer from string\n");
+	cil_log(CIL_ERR, "Failed to fill 32-bit integer\n");
 	return rc;
 }
 
 int cil_fill_integer64(struct cil_tree_node *int_node, uint64_t *integer, int base)
 {
 	int rc = SEPOL_ERR;
-	char *endptr = NULL;
-	uint64_t val;
 
 	if (int_node == NULL || int_node->data == NULL || integer == NULL) {
 		goto exit;
 	}
 
-	errno = 0;
+	rc = cil_string_to_uint64(int_node->data, integer, base);
-	val = strtoull(int_node->data, &endptr, base);
+	if (rc != SEPOL_OK) {
-	if (errno != 0 || endptr == int_node->data || *endptr != '\0') {
-		rc = SEPOL_ERR;
 		goto exit;
 	}
 
-	*integer = val;
-
 	return SEPOL_OK;
 
 exit:
-	cil_log(CIL_ERR, "Failed to create integer from string\n");
+	cil_log(CIL_ERR, "Failed to fill 64-bit integer\n");
 	return rc;
 }
 

libsepol/cil/src/cil_internal.h

@@ -986,6 +986,8 @@ void cil_symtab_array_init(symtab_t symtab[], const int symtab_sizes[CIL_SYM_NUM
 void cil_symtab_array_destroy(symtab_t symtab[]);
 void cil_destroy_ast_symtabs(struct cil_tree_node *root);
 int cil_get_symtab(struct cil_tree_node *ast_node, symtab_t **symtab, enum cil_sym_index sym_index);
+int cil_string_to_uint32(const char *string, uint32_t *value, int base);
+int cil_string_to_uint64(const char *string, uint64_t *value, int base);
 
 void cil_sort_init(struct cil_sort **sort);
 void cil_sort_destroy(struct cil_sort **sort);

libsepol/cil/src/cil_parser.c

@@ -103,8 +103,7 @@ static int add_hll_linemark(struct cil_tree_node **current, uint32_t *hll_lineno
 	struct cil_tree_node *node;
 	struct token tok;
 	char *hll_file;
-	char *end = NULL;
+	int rc;
-	unsigned long val;
 
 	cil_lexer_next(&tok);
 	if (tok.type != SYMBOL) {
@@ -142,18 +141,11 @@ static int add_hll_linemark(struct cil_tree_node **current, uint32_t *hll_lineno
 			goto exit;
 		}
 
-		val = strtoul(tok.value, &end, 10);
+		rc = cil_string_to_uint32(tok.value, hll_lineno, 10);
-		if (errno == ERANGE || *end != '\0') {
+		if (rc != SEPOL_OK) {
-			cil_log(CIL_ERR, "Problem parsing line number for line mark\n");
 			goto exit;
 		}
-#if ULONG_MAX > UINT32_MAX
+
-		if (val > UINT32_MAX) {
-			cil_log(CIL_ERR, "Line mark line number > UINT32_MAX\n");
-			goto exit;
-		}
-#endif
-		*hll_lineno = val;
 		*hll_expand = (hll_type == CIL_KEY_HLL_LMX) ? 1 : 0;
 
 		cil_lexer_next(&tok);