fix usage of locks with vfork

[musl] / src / stdio / fmemopen.c

diff --git a/src/stdio/fmemopen.c b/src/stdio/fmemopen.c
index 260d288..770fd99 100644 (file)
--- a/src/stdio/fmemopen.c
+++ b/src/stdio/fmemopen.c
@@ -54,9 +54,10 @@ static size_t mwrite(FILE *f, const unsigned char *buf, size_t len)
        if (len > rem) len = rem;
        memcpy(c->buf+c->pos, buf, len);
        c->pos += len;
-       if (c->pos >= c->len) {
+       if (c->pos > c->len) {
                c->len = c->pos;
-               c->buf[c->len==c->size ? c->len-1 : c->len] = 0;
+               if (c->len < c->size) c->buf[c->len] = 0;
+               else if ((f->flags&F_NORD) && c->size) c->buf[c->size-1] = 0;
        }
        return len;
 }
@@ -66,7 +67,7 @@ static int mclose(FILE *m)
        return 0;
 }
 
-FILE *fmemopen(void *buf, size_t size, const char *mode)
+FILE *fmemopen(void *restrict buf, size_t size, const char *restrict mode)
 {
        FILE *f;
        struct cookie *c;