From: Richard Russon <rich@flatcap.org>
Date: Fri, 24 Aug 2018 14:38:55 +0000 (+0100)
Subject: add mutt_str_inline_replace()
X-Git-Tag: 2019-10-25~682^2~13
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=0477ea2c7b881a74de97380d7149f05d5ecd1e27;p=neomutt

add mutt_str_inline_replace()
---

diff --git a/mutt/string.c b/mutt/string.c
index 9b872f7cb..d68ad435e 100644
--- a/mutt/string.c
+++ b/mutt/string.c
@@ -959,3 +959,27 @@ const char *mutt_str_getenv(const char *name)
 
   return NULL;
 }
+
+/**
+ * mutt_str_inline_replace - Replace the beginning of a string
+ * @param buf    Buffer to modify
+ * @param buflen Length of buffer
+ * @param xlen   Length of string to overwrite
+ * @param rstr   Replacement string
+ * @retval true Success
+ *
+ * String (`XX<OOOOOO>......`, 16, 2, `RRRR`) becomes `RRRR<OOOOOO>....`
+ */
+bool mutt_str_inline_replace(char *buf, size_t buflen, size_t xlen, const char *rstr)
+{
+  if (!buf || !rstr || (xlen >= buflen))
+    return false;
+
+  size_t slen = mutt_str_strlen(buf + xlen);
+  size_t rlen = mutt_str_strlen(rstr);
+
+  memmove(buf + rlen, buf + xlen, slen + 1);
+  memmove(buf, rstr, rlen);
+
+  return true;
+}
diff --git a/mutt/string2.h b/mutt/string2.h
index cd931a731..ce67d6ed1 100644
--- a/mutt/string2.h
+++ b/mutt/string2.h
@@ -71,6 +71,7 @@ int         mutt_str_atoul(const char *str, unsigned long *dst);
 void        mutt_str_dequote_comment(char *s);
 const char *mutt_str_find_word(const char *src);
 const char *mutt_str_getenv(const char *name);
+bool        mutt_str_inline_replace(char *buf, size_t buflen, size_t xlen, const char *rstr);
 bool        mutt_str_is_ascii(const char *p, size_t len);
 bool        mutt_str_is_email_wsp(char c);
 size_t      mutt_str_lws_len(const char *s, size_t n);