fix multiple stdio functions' behavior on zero-length operations

[musl] / src / stdio / fread.c

diff --git a/src/stdio/fread.c b/src/stdio/fread.c
index c461256..33a65f5 100644 (file)
--- a/src/stdio/fread.c
+++ b/src/stdio/fread.c
@@ -8,11 +8,10 @@ size_t fread(void *restrict destv, size_t size, size_t nmemb, FILE *restrict f)
        unsigned char *dest = destv;
        size_t len = size*nmemb, l = len, k;
 
-       /* Never touch the file if length is zero.. */
-       if (!l) return 0;
-
        FLOCK(f);
 
+       f->mode |= f->mode-1;
+
        if (f->rend - f->rpos > 0) {
                /* First exhaust the buffer. */
                k = MIN(f->rend - f->rpos, l);