1 files changed, 70 insertions, 0 deletions
diff --git a/src/iconv.c b/src/iconv.c
new file mode 100644
index 0000000..1bf4d94
--- /dev/null
+++ b/src/iconv.c
@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2020, yzrh <yzrh@tuta.io>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+#include <iconv.h>
+
+/* So, why would anyone use something other than UTF-8? */
+int
+strconv(char **dst,
+	const char * restrict dst_code,
+	const char * restrict src,
+	const char * restrict src_code,
+	int *size)
+{
+	size_t dst_size = *size;
+	char *dst_conv = malloc(dst_size);
+
+	if (dst_conv == NULL)
+		return 1;
+
+	size_t src_size = strlen(src) + 1;
+	char *src_conv = malloc(src_size);
+
+	if (src_conv == NULL) {
+		free(dst_conv);
+		return 1;
+	}
+
+	strncpy(src_conv, src, src_size);
+
+	char *dst_start = dst_conv;
+	char *src_start = src_conv;
+
+	iconv_t conv_src_dst = iconv_open(dst_code, src_code);
+
+	if (conv_src_dst == (iconv_t) - 1) {
+		free(dst_conv);
+		free(src_conv);
+		return 1;
+	}
+
+	if (iconv(conv_src_dst,
+		&src_conv, &src_size,
+		&dst_conv, &dst_size) == (size_t) - 1) {
+		free(dst_start);
+		free(src_start);
+		return 1;
+	} else {
+		/* Not including NULL */
+		*size -= dst_size + 2;
+
+		*dst = malloc(*size);
+
+		if (*dst != NULL)
+			memcpy(*dst, dst_start, *size);
+
+		free(dst_start);
+		free(src_start);
+	}
+
+	if (iconv_close(conv_src_dst) != 0 || *dst == NULL)
+		return 1;
+
+	return 0;
+}