From: Tim Duesterhus <tim@bastelstu.be>
Date: Mon, 5 Apr 2021 15:53:55 +0000 (+0200)
Subject: MINOR: ist: Add `istshift(struct ist*)`
X-Git-Tag: v2.4-dev16~9
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=90aa8c7f027463f89a5c11c3f18962a896329bb3;p=thirdparty%2Fhaproxy.git

MINOR: ist: Add `istshift(struct ist*)`

istshift() returns the first character and advances the ist by 1.
---

diff --git a/include/import/ist.h b/include/import/ist.h
index 3f63ed2dda..6ece7cdf96 100644
--- a/include/import/ist.h
+++ b/include/import/ist.h
@@ -240,6 +240,21 @@ static inline struct ist istnext(const struct ist ist)
 	return ret;
 }
 
+/* Returns the first character of the <ist> and advances the <ist> by 1.
+ * If the <ist> is empty the result is undefined.
+ */
+static inline char istshift(struct ist *ist)
+{
+	if (ist->len) {
+		char c = *ist->ptr;
+		*ist = istnext(*ist);
+
+		return c;
+	}
+
+	return 0;
+}
+
 /* copies the contents from string <ist> to buffer <buf> and adds a trailing
  * zero. The caller must ensure <buf> is large enough.
  */