Replace getline with fgets in sslecho demo

Windows doesn't support getline, so we need to use fgets here

Reviewed-by: Nicola Tuveri <nic.tuv@gmail.com>
Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Paul Dale <ppzgs1@gmail.com>
Reviewed-by: Tom Cosgrove <tom.cosgrove@arm.com>
(Merged from https://github.com/openssl/openssl/pull/24047)

1 files changed, 9 insertions, 10 deletions

diff --git a/demos/sslecho/main.c b/demos/sslecho/main.c
index 4973902cf5..41d4418c3f 100644
--- a/demos/sslecho/main.c
+++ b/demos/sslecho/main.c
@@ -133,6 +133,7 @@ static void usage(void)
     exit(EXIT_FAILURE);
 }
 
+#define BUFFERSIZE 1024
 int main(int argc, char **argv)
 {
     bool isServer;
@@ -144,10 +145,9 @@ int main(int argc, char **argv)
     int server_skt = -1;
     int client_skt = -1;
 
-    /* used by getline relying on realloc, can't be statically allocated */
-    char *txbuf = NULL;
-    size_t txcap = 0;
-    int txlen;
+    /* used by fgets */
+    char buffer[BUFFERSIZE];
+    char *txbuf;
 
     char rxbuf[128];
     size_t rxcap = sizeof(rxbuf);
@@ -309,9 +309,11 @@ int main(int argc, char **argv)
             /* Loop to send input from keyboard */
             while (true) {
                 /* Get a line of input */
-                txlen = getline(&txbuf, &txcap, stdin);
+                memset(buffer, 0, BUFFERSIZE);
+                txbuf = fgets(buffer, BUFFERSIZE, stdin);
+
                 /* Exit loop on error */
-                if (txlen < 0 || txbuf == NULL) {
+                if (txbuf == NULL) {
                     break;
                 }
                 /* Exit loop if just a carriage return */
@@ -319,7 +321,7 @@ int main(int argc, char **argv)
                     break;
                 }
                 /* Send it to the server */
-                if ((result = SSL_write(ssl, txbuf, txlen)) <= 0) {
+                if ((result = SSL_write(ssl, txbuf, strlen(txbuf))) <= 0) {
                     printf("Server closed connection\n");
                     ERR_print_errors_fp(stderr);
                     break;
@@ -358,9 +360,6 @@ exit:
     if (server_skt != -1)
         close(server_skt);
 
-    if (txbuf != NULL && txcap > 0)
-        free(txbuf);
-
     printf("sslecho exiting\n");
 
     return EXIT_SUCCESS;