fileio: initialize errno to zero before we do fread()

if there was something in the read buffer already errno might not be set
on error, let's detect that case.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/basic/fileio.c b/src/basic/fileio.c
index 7638ae87a..f4ab6612b 100644
--- a/src/basic/fileio.c
+++ b/src/basic/fileio.c
@@ -271,12 +271,13 @@ int read_full_stream(FILE *f, char **contents, size_t *size) {
                         return -ENOMEM;
 
                 buf = t;
+                errno = 0;
                 k = fread(buf + l, 1, n - l, f);
                 if (k > 0)
                         l += k;
 
                 if (ferror(f))
-                        return -errno;
+                        return errno > 0 ? -errno : -EIO;
 
                 if (feof(f))
                         break;