From e6b181bea747628232b9b3c1fc83791e728a91c5 Mon Sep 17 00:00:00 2001
From: Vladislav Valtchev <vladislav.valtchev@gmail.com>
Date: Tue, 19 Nov 2019 13:49:35 +0200
Subject: [PATCH 1/2] Call read() in a loop in W_StdC_Read()

The read() syscall does *not* guaratee that the whole buffer will be filled
before returning. Partial reads must be expected.
---
 fbdoom/w_file_stdc_unbuffered.c | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/fbdoom/w_file_stdc_unbuffered.c b/fbdoom/w_file_stdc_unbuffered.c
index e59e63b..b271e39 100644
--- a/fbdoom/w_file_stdc_unbuffered.c
+++ b/fbdoom/w_file_stdc_unbuffered.c
@@ -20,6 +20,7 @@
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <errno.h>
 #include <fcntl.h>
 #include <unistd.h>
 
@@ -92,7 +93,8 @@ size_t W_StdC_Read(wad_file_t *wad, unsigned int offset,
                    void *buffer, size_t buffer_len)
 {
     stdc_wad_file_t *stdc_wad;
-    size_t result;
+    size_t result = 0;
+    int rc;
 
     stdc_wad = (stdc_wad_file_t *) wad;
 
@@ -102,7 +104,21 @@ size_t W_StdC_Read(wad_file_t *wad, unsigned int offset,
 
     // Read into the buffer.
 
-    result = read(stdc_wad->fd, buffer, buffer_len);
+    do {
+
+        rc = read(stdc_wad->fd, (char *)buffer + result, buffer_len - result);
+
+        if (rc <= 0) {
+
+            if (rc < 0 && errno == EINTR)
+                continue;
+
+            break;
+        }
+
+        result += rc;
+
+    } while (result < buffer_len);
 
     return result;
 }

From f5725ff6f23aa2ac77c11db9e414329da5ba56bf Mon Sep 17 00:00:00 2001
From: Vladislav Valtchev <vladislav.valtchev@gmail.com>
Date: Tue, 19 Nov 2019 14:13:56 +0200
Subject: [PATCH 2/2] Introduce the NOSDL option in the Makefile

For many reasons, the SDL library might not be available on some systems.
Therefore, it's useful to offer a way to build without it. With this patch,
it's possible to build fbDoom without SDL in the following way:

    make NOSDL=1
---
 fbdoom/Makefile | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fbdoom/Makefile b/fbdoom/Makefile
index cb88745..fb32c7b 100644
--- a/fbdoom/Makefile
+++ b/fbdoom/Makefile
@@ -23,7 +23,11 @@ CC=$(CROSS_COMPILE)gcc  # gcc or g++
 CFLAGS+=-ggdb3 -Os
 LDFLAGS+=-Wl,--gc-sections
 CFLAGS+=-ggdb3 -Wall -DNORMALUNIX -DLINUX -DSNDSERV # -DUSEASM
-LIBS+=-lm -lc -lSDL
+LIBS+=-lm -lc
+
+ifneq ($(NOSDL),1)
+	LIBS+= -lSDL
+endif
 
 # subdirectory for objects
 OBJDIR=build