From: Christopher Faulet <cfaulet@haproxy.com>
Date: Tue, 6 Aug 2019 14:55:52 +0000 (+0200)
Subject: MINOR: istbuf: Add the function b_isteqi()
X-Git-Tag: v2.1-dev2~72
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=130cf2170992647b21a635b8e7b4ff0a8cb3b5ac;p=thirdparty%2Fhaproxy.git

MINOR: istbuf: Add the function b_isteqi()

This function compares a part of a buffer to an indirect string (ist), ignoring
the case of the characters.
---

diff --git a/include/common/istbuf.h b/include/common/istbuf.h
index 274bf5ea81..9b6ce7c6bd 100644
--- a/include/common/istbuf.h
+++ b/include/common/istbuf.h
@@ -64,6 +64,29 @@ static inline ssize_t b_isteq(const struct buffer *b, size_t o, size_t n, const
 	return ist.len;
 }
 
+/* Same as b_isteq but case-insensitive */
+static inline ssize_t b_isteqi(const struct buffer *b, size_t o, size_t n, const struct ist ist)
+{
+	struct ist r = ist;
+	const char *p;
+	const char *end = b_wrap(b);
+
+	if (n < r.len)
+		return 0;
+
+	p = b_peek(b, o);
+	while (r.len--) {
+		if (*p != *r.ptr &&
+		    ist_lc[(unsigned char)*p] != ist_lc[(unsigned char)*r.ptr])
+			return -1;
+		p++;
+		r.ptr++;
+		if (unlikely(p == end))
+			p = b_orig(b);
+	}
+	return ist.len;
+}
+
 /* b_isteat() : "eats" string <ist> from the head of buffer <b>. Wrapping data
  * is explicitly supported. It matches a single byte per iteration so strings
  * should remain reasonably small. Returns :