New upstream version 4.8upstream/4.8

1 files changed, 13 insertions, 2 deletions

diff --git a/src/io.c b/src/io.c
index b5bdc08..c797193 100644
--- a/src/io.c
+++ b/src/io.c
@@ -7,6 +7,9 @@
  *	General Public License as published by the Free Software Foundation;
  *	either version 2.1 or (at your option) any later version.
  */
+#ifdef HAVE_CONFIG_H
+#	include "config.h"
+#endif
 #include <sys/stat.h>
 #include <errno.h>
 #include <fcntl.h>
@@ -694,10 +697,13 @@ EXPORT_SYMBOL char *HX_slurp_fd(int fd, size_t *outsize)
 		if (buf == nullptr)
 			return nullptr;
 		ssize_t rdret;
-		while ((rdret = read(fd, buf, bufsize - 1 - offset)) > 0) {
+		while ((rdret = read(fd, buf + offset, bufsize - 1 - offset)) > 0) {
 			offset += rdret;
+			/*
+			 * Make it so that the next read call is not called
+			 * with an exceptionally small size.
+			 */
 			if (bufsize - offset >= 4095)
-				/* any value would work, but >=1 is not all that efficient */
 				continue;
 			if (bufsize > SSIZE_MAX)
 				/* No more doubling */
@@ -720,6 +726,11 @@ EXPORT_SYMBOL char *HX_slurp_fd(int fd, size_t *outsize)
 	size_t fsize = sb.st_size; /* may truncate from loff_t to size_t */
 	if (fsize == SIZE_MAX)
 		--fsize;
+#ifdef HAVE_POSIX_FADVISE
+	if (fsize > 0 && posix_fadvise(fd, 0, fsize,
+	    POSIX_FADV_SEQUENTIAL) != 0)
+		/* ignore */;
+#endif
 	char *buf = malloc(fsize + 1);
 	if (buf == NULL)
 		return NULL;