tools: add wincompat layer to wg(8)

1 files changed, 105 insertions, 0 deletions

diff --git a/src/tools/wincompat/libc.c b/src/tools/wincompat/libc.c
new file mode 100644
index 0000000..ad30278
--- /dev/null
+++ b/src/tools/wincompat/libc.c
@@ -0,0 +1,105 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ */
+
+#include <stdio.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <winsock2.h>
+#include <ws2tcpip.h>
+#include <windows.h>
+
+char *strsep(char **str, const char *sep)
+{
+	char *s = *str, *end;
+	if (!s)
+		return NULL;
+	end = s + strcspn(s, sep);
+	if (*end)
+		*end++ = 0;
+	else
+		end = 0;
+	*str = end;
+	return s;
+}
+
+ssize_t getdelim(char **buf, size_t *bufsiz, int delimiter, FILE *fp)
+{
+	char *ptr, *eptr;
+
+	if (!*buf || !*bufsiz) {
+		*bufsiz = BUFSIZ;
+		if (!(*buf = malloc(*bufsiz)))
+			return -1;
+	}
+
+	for (ptr = *buf, eptr = *buf + *bufsiz;;) {
+		int c = fgetc(fp);
+		if (c == -1) {
+			if (feof(fp)) {
+				ssize_t diff = (ssize_t)(ptr - *buf);
+				if (diff != 0) {
+					*ptr = '\0';
+					return diff;
+				}
+			}
+			return -1;
+		}
+		*ptr++ = c;
+		if (c == delimiter) {
+			*ptr = '\0';
+			return ptr - *buf;
+		}
+		if (ptr + 2 >= eptr) {
+			char *nbuf;
+			size_t nbufsiz = *bufsiz * 2;
+			ssize_t d = ptr - *buf;
+			if ((nbuf = realloc(*buf, nbufsiz)) == NULL)
+				return -1;
+			*buf = nbuf;
+			*bufsiz = nbufsiz;
+			eptr = nbuf + nbufsiz;
+			ptr = nbuf + d;
+		}
+	}
+}
+
+ssize_t getline(char **buf, size_t *bufsiz, FILE *fp)
+{
+	return getdelim(buf, bufsiz, '\n', fp);
+}
+
+int inet_pton(int af, const char *src, void *dst)
+{
+	struct sockaddr_storage ss = { 0 };
+	int size = sizeof(ss);
+	char s[INET6_ADDRSTRLEN + 1];
+
+	strncpy(s, src, INET6_ADDRSTRLEN + 1);
+	s[INET6_ADDRSTRLEN] = '\0';
+
+	if (WSAStringToAddress(s, af, NULL, (struct sockaddr *)&ss, &size))
+		return 0;
+	if (af == AF_INET)
+		*(struct in_addr *)dst = ((struct sockaddr_in *)&ss)->sin_addr;
+	else if (af == AF_INET6)
+		*(struct in6_addr *)dst = ((struct sockaddr_in6 *)&ss)->sin6_addr;
+	else
+		return 0;
+	return 1;
+}
+
+const char *inet_ntop(int af, const void *src, char *dst, socklen_t size)
+{
+	struct sockaddr_storage ss = { .ss_family = af };
+	unsigned long s = size;
+
+	if (af == AF_INET)
+		((struct sockaddr_in *)&ss)->sin_addr = *(struct in_addr *)src;
+	else if (af == AF_INET6)
+		((struct sockaddr_in6 *)&ss)->sin6_addr = *(struct in6_addr *)src;
+	else
+		return NULL;
+	return WSAAddressToString((struct sockaddr *)&ss, sizeof(ss), NULL, dst, &s) ? NULL : dst;
+}