From: Baptiste Assmann <bedis9@gmail.com>
Date: Sun, 29 Mar 2020 06:10:16 +0000 (+0200)
Subject: MINOR: ist: add istadv() function
X-Git-Tag: v2.2-dev7~7
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9ef1967af73f66c0e302cae84576fc78b4826637;p=thirdparty%2Fhaproxy.git

MINOR: ist: add istadv() function

The purpose of istadv() function is to move forward <.ptr> by <nb>
characters. It is very useful when parsing a payload.
---

diff --git a/include/common/ist.h b/include/common/ist.h
index 2b5178f8c0..2b647a22a7 100644
--- a/include/common/ist.h
+++ b/include/common/ist.h
@@ -740,6 +740,17 @@ static inline struct ist iststop(const struct ist ist, char chr)
 	return ist2(ist.ptr, len - 1);
 }
 
+/*
+ * advance <.ptr> by <nb> characters.
+ * If <ist> is too short, (ist.end,0) is returned.
+ */
+static inline struct ist istadv(const struct ist ist, const size_t nb)
+{
+	if (ist.len < nb)
+		return ist2(ist.ptr + ist.len, 0);
+	return ist2(ist.ptr + nb, ist.len - nb);
+}
+
 #ifndef IST_FREESTANDING
 /* This function allocates <size> bytes and returns an `ist` pointing to
  * the allocated area with size `0`.