From bf15dbf6cf19146082c1245e9db4016d773dbe7e Mon Sep 17 00:00:00 2001
From: Patrick Steinhardt <ps@pks.im>
Date: Mon, 6 Nov 2017 12:47:40 +0000
Subject: [PATCH] examples: network: fix Win32 linking errors due to getline

The getline(3) function call is not part of ISO C and, most importantly,
it is not implemented on Microsoft Windows platforms. As our networking
example code makes use of getline, this breaks builds on MSVC and MinGW.
As this code wasn't built prior to the previous commit, this was never
noticed.

Fix the error by instead implementing a `readline` function, which
simply reads the password from stdin until it reads a newline
character.
---
 examples/network/common.c | 41 +++++++++++++++++++++++++++++++++++++--
 1 file changed, 39 insertions(+), 2 deletions(-)

diff --git a/examples/network/common.c b/examples/network/common.c
index 1a81a10f8..b0afb0238 100644
--- a/examples/network/common.c
+++ b/examples/network/common.c
@@ -16,6 +16,43 @@
 # define UNUSED(x) x
 #endif
 
+static int readline(char **out)
+{
+	int c, error = 0, length = 0, allocated = 0;
+	char *line = NULL;
+
+	errno = 0;
+
+	while ((c = getchar()) != EOF) {
+		if (length == allocated) {
+			allocated += 16;
+
+			if ((line = realloc(line, allocated)) == NULL) {
+				error = -1;
+				goto error;
+			}
+		}
+
+		if (c == '\n')
+			break;
+
+		line[length++] = c;
+	}
+
+	if (errno != 0) {
+		error = -1;
+		goto error;
+	}
+
+	line[length] = '\0';
+	*out = line;
+	line = NULL;
+	error = length;
+error:
+	free(line);
+	return error;
+}
+
 int cred_acquire_cb(git_cred **out,
 		const char * UNUSED(url),
 		const char * UNUSED(username_from_url),
@@ -26,14 +63,14 @@ int cred_acquire_cb(git_cred **out,
 	int error;
 
 	printf("Username: ");
-	if (getline(&username, NULL, stdin) < 0) {
+	if (readline(&username) < 0) {
 		fprintf(stderr, "Unable to read username: %s", strerror(errno));
 		return -1;
 	}
 
 	/* Yup. Right there on your terminal. Careful where you copy/paste output. */
 	printf("Password: ");
-	if (getline(&password, NULL, stdin) < 0) {
+	if (readline(&password) < 0) {
 		fprintf(stderr, "Unable to read password: %s", strerror(errno));
 		free(username);
 		return -1;