[PATCH 1/8] Add new function strbuf_add_xml_quoted()

[Michael Haggerty]

Substantially the same code is present in http-push.c and imap-send.c,
so make a library function out of it.

Signed-off-by: Michael Haggerty <mhag...@alum.mit.edu>
---
 strbuf.c | 26 ++++++++++++++++++++++++++
 strbuf.h |  6 ++++++
 2 files changed, 32 insertions(+)

diff --git a/strbuf.c b/strbuf.c
index 05d0693..9a373be 100644
--- a/strbuf.c
+++ b/strbuf.c
@@ -425,6 +425,32 @@ void strbuf_add_lines(struct strbuf *out, const char 
*prefix,
        strbuf_complete_line(out);
 }
 
+void strbuf_addstr_xml_quoted(struct strbuf *buf, const char *s)
+{
+       while (*s) {
+               size_t len = strcspn(s, "\"<>&");
+               strbuf_add(buf, s, len);
+               s += len;
+               switch (*s) {
+               case '"':
+                       strbuf_addstr(buf, "&quot;");
+                       break;
+               case '<':
+                       strbuf_addstr(buf, "&lt;");
+                       break;
+               case '>':
+                       strbuf_addstr(buf, "&gt;");
+                       break;
+               case '&':
+                       strbuf_addstr(buf, "&amp;");
+                       break;
+               case 0:
+                       return;
+               }
+               s++;
+       }
+}
+
 static int is_rfc3986_reserved(char ch)
 {
        switch (ch) {
diff --git a/strbuf.h b/strbuf.h
index aa386c6..ecae4e2 100644
--- a/strbuf.h
+++ b/strbuf.h
@@ -136,6 +136,12 @@ extern void strbuf_vaddf(struct strbuf *sb, const char 
*fmt, va_list ap);
 
 extern void strbuf_add_lines(struct strbuf *sb, const char *prefix, const char 
*buf, size_t size);
 
+/*
+ * Append s to sb, with the characters '<', '>', '&' and '"' converted
+ * into XML entities.
+ */
+extern void strbuf_addstr_xml_quoted(struct strbuf *sb, const char *s);
+
 static inline void strbuf_complete_line(struct strbuf *sb)
 {
        if (sb->len && sb->buf[sb->len - 1] != '\n')
-- 
1.8.0

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