[PATCH 1/4] strbuf.c: keep errno in strbuf_read_file()

[Nguyễn Thái Ngọc Duy]

This function is used to replaced some code in the next patch that
does this (i.e. keep the errno when read() fails)

Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
 strbuf.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/strbuf.c b/strbuf.c
index 33018d8..61d685d 100644
--- a/strbuf.c
+++ b/strbuf.c
@@ -454,15 +454,18 @@ int strbuf_getwholeline_fd(struct strbuf *sb, int fd, int 
term)
 
 int strbuf_read_file(struct strbuf *sb, const char *path, size_t hint)
 {
-       int fd, len;
+       int fd, len, saved_errno;
 
        fd = open(path, O_RDONLY);
        if (fd < 0)
                return -1;
        len = strbuf_read(sb, fd, hint);
+       saved_errno = errno;
        close(fd);
-       if (len < 0)
+       if (len < 0) {
+               errno = saved_errno;
                return -1;
+       }
 
        return len;
 }
-- 
1.9.1.346.ga2b5940

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