From: Baptiste Daroussin <bapt@FreeBSD.org>
Date: Fri, 10 Feb 2023 12:54:40 +0000 (+0100)
Subject: xstring: add a wrapper around open_memstream
X-Git-Tag: RELEASE_1_4_0b1~181
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=baa8b70817ab43ac07462db11fe14a29bcab7124;p=thirdparty%2Fmlmmj.git

xstring: add a wrapper around open_memstream
---

diff --git a/include/xstring.h b/include/xstring.h
new file mode 100644
index 00000000..24738a66
--- /dev/null
+++ b/include/xstring.h
@@ -0,0 +1,68 @@
+#ifndef __XSTRING_H_
+#define __XSTRING_H_
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+struct xstring {
+	char* buf;
+	size_t size;
+	FILE* fp;
+};
+
+typedef struct xstring xstring;
+
+static inline xstring *
+xstring_new(void)
+{
+	xstring *str;
+
+	str = calloc(1, sizeof(*str));
+	if (str == NULL)
+		abort();
+	str->fp = open_memstream(&str->buf, &str->size);
+	if (str->fp == NULL)
+		abort();
+
+	return (str);
+}
+
+static inline void
+xstring_reset(xstring *str)
+{
+	if (str->buf)
+		memset(str->buf, 0, str->size);
+	rewind(str->fp);
+
+}
+
+static inline void
+xstring_free(xstring *str)
+{
+	if (str == NULL)
+		return;
+	fclose(str->fp);
+	free(str->buf);
+	free(str);
+}
+
+#define xstring_renew(s)      \
+do {                          \
+   if (s) {                   \
+     xstring_reset(s);        \
+   } else {                   \
+     s = xstring_new();       \
+   }                          \
+} while(0)
+
+static inline char *
+xstring_get(xstring *str)
+{
+	fclose(str->fp);
+	char *ret = str->buf;
+	free(str);
+	return (ret);
+}
+
+#endif