fix logic error in fread

[musl] / src / stdio / __stdio_read.c

diff --git a/src/stdio/__stdio_read.c b/src/stdio/__stdio_read.c
index a2e4cd6..218bd88 100644 (file)
--- a/src/stdio/__stdio_read.c
+++ b/src/stdio/__stdio_read.c
@@ -3,7 +3,7 @@
 size_t __stdio_read(FILE *f, unsigned char *buf, size_t len)
 {
        struct iovec iov[2] = {
-               { .iov_base = buf, .iov_len = len },
+               { .iov_base = buf, .iov_len = len - !!f->buf_size },
                { .iov_base = f->buf, .iov_len = f->buf_size }
        };
        ssize_t cnt;
@@ -14,9 +14,10 @@ size_t __stdio_read(FILE *f, unsigned char *buf, size_t len)
                f->rpos = f->rend = 0;
                return cnt;
        }
-       if (cnt <= len) return cnt;
-       cnt -= len;
+       if (cnt <= iov[0].iov_len) return cnt;
+       cnt -= iov[0].iov_len;
        f->rpos = f->buf;
        f->rend = f->buf + cnt;
+       if (f->buf_size) buf[len-1] = *f->rpos++;
        return len;
 }