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-rw-r--r--buffer_get.c67
1 files changed, 67 insertions, 0 deletions
diff --git a/buffer_get.c b/buffer_get.c
new file mode 100644
index 0000000..937b75e
--- /dev/null
+++ b/buffer_get.c
@@ -0,0 +1,67 @@
+#include "buffer.h"
+#include "byte.h"
+#include "error.h"
+
+static int oneread(int (*op)(),int fd,char *buf,unsigned int len)
+{
+ int r;
+
+ for (;;) {
+ r = op(fd,buf,len);
+ if (r == -1) if (errno == error_intr) continue;
+ return r;
+ }
+}
+
+static int getthis(buffer *s,char *buf,unsigned int len)
+{
+ if (len > s->p) len = s->p;
+ s->p -= len;
+ byte_copy(buf,len,s->x + s->n);
+ s->n += len;
+ return len;
+}
+
+int buffer_feed(buffer *s)
+{
+ int r;
+
+ if (s->p) return s->p;
+ r = oneread(s->op,s->fd,s->x,s->n);
+ if (r <= 0) return r;
+ s->p = r;
+ s->n -= r;
+ if (s->n > 0) byte_copyr(s->x + s->n,r,s->x);
+ return r;
+}
+
+int buffer_bget(buffer *s,char *buf,unsigned int len)
+{
+ int r;
+
+ if (s->p > 0) return getthis(s,buf,len);
+ if (s->n <= len) return oneread(s->op,s->fd,buf,s->n);
+ r = buffer_feed(s); if (r <= 0) return r;
+ return getthis(s,buf,len);
+}
+
+int buffer_get(buffer *s,char *buf,unsigned int len)
+{
+ int r;
+
+ if (s->p > 0) return getthis(s,buf,len);
+ if (s->n <= len) return oneread(s->op,s->fd,buf,len);
+ r = buffer_feed(s); if (r <= 0) return r;
+ return getthis(s,buf,len);
+}
+
+char *buffer_peek(buffer *s)
+{
+ return s->x + s->n;
+}
+
+void buffer_seek(buffer *s,unsigned int len)
+{
+ s->n += len;
+ s->p -= len;
+}