From 51d0fdce74aeb23ef28336037b2d35aa4c955cee Mon Sep 17 00:00:00 2001
From: Laurent Bercot <ska-skaware@skarnet.org>
Date: Wed, 20 Dec 2023 14:08:25 +0000
Subject:  Major refactors; implement ranges

Signed-off-by: Laurent Bercot <ska@appnovation.com>
---
 src/libtipidee/tipidee_util_parse_range.c | 49 +++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 src/libtipidee/tipidee_util_parse_range.c

(limited to 'src/libtipidee/tipidee_util_parse_range.c')

diff --git a/src/libtipidee/tipidee_util_parse_range.c b/src/libtipidee/tipidee_util_parse_range.c
new file mode 100644
index 0000000..e096fda
--- /dev/null
+++ b/src/libtipidee/tipidee_util_parse_range.c
@@ -0,0 +1,49 @@
+/* ISC license. */
+
+#include <string.h>
+
+#include <skalibs/uint64.h>
+
+#include <tipidee/util.h>
+
+int tipidee_util_parse_range (char const *s, off_t max, uint64_t *start, uint64_t *len)
+{
+  if (strncmp(s, "bytes=", 6)) return -1 ;
+  s += 6 ;
+  if (*s == '-')
+  {
+    uint64_t n ;
+    size_t m = uint64_scan(++s, &n) ;
+    if (!m) return -1 ;
+    s += m ;
+    if (*s && *s != ',') return -1 ;
+    if (n > max) return -1 ;
+    *start = max - n ;
+    *len = n ;
+    return 1 ;
+  }
+  else
+  {
+    uint64_t beg ;
+    uint64_t n ;
+    size_t m = uint64_scan(s, &beg) ;
+    if (!m) return -1 ;
+    s += m ;
+    if (*s++ != '-') return -1 ;
+    if (beg >= max) return -1 ;
+    if (!*s || *s == ',')
+    {
+      *start = beg ;
+      *len = max - beg ;
+      return 1 ;
+    }
+    m = uint64_scan(s, &n) ;
+    if (!m) return -1 ;
+    s += m ;
+    if (*s && *s != ',') return -1 ;
+    if (n >= max || n < beg) return -1 ;
+    *start = beg ;
+    *len = n + 1 - beg ;
+    return 1 ;
+  }
+}
-- 
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