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-rw-r--r--src/util/Alloc.cxx63
-rw-r--r--src/util/Alloc.hxx19
2 files changed, 82 insertions, 0 deletions
diff --git a/src/util/Alloc.cxx b/src/util/Alloc.cxx
index ec3579470..403ad535d 100644
--- a/src/util/Alloc.cxx
+++ b/src/util/Alloc.cxx
@@ -74,3 +74,66 @@ xstrndup(const char *s, size_t n)
return p;
}
+
+template<typename... Args>
+static inline size_t
+FillLengths(size_t *lengths, const char *a, Args&&... args)
+{
+ return FillLengths(lengths, a) + FillLengths(lengths + 1, args...);
+}
+
+template<>
+inline size_t
+FillLengths(gcc_unused size_t *lengths, const char *a)
+{
+ return *lengths = strlen(a);
+}
+
+template<typename... Args>
+static inline void
+StringCat(char *p, const size_t *lengths, const char *a, Args&&... args)
+{
+ StringCat(p, lengths, a);
+ StringCat(p + *lengths, lengths + 1, args...);
+}
+
+template<>
+inline void
+StringCat(char *p, const size_t *lengths, const char *a)
+{
+ memcpy(p, a, *lengths);
+}
+
+template<typename... Args>
+gcc_malloc gcc_nonnull_all
+static inline char *
+t_xstrcatdup(Args&&... args)
+{
+ constexpr size_t n = sizeof...(args);
+
+ size_t lengths[n];
+ const size_t total = FillLengths(lengths, args...);
+
+ char *p = (char *)xalloc(total + 1);
+ StringCat(p, lengths, args...);
+ p[total] = 0;
+ return p;
+}
+
+char *
+xstrcatdup(const char *a, const char *b)
+{
+ return t_xstrcatdup(a, b);
+}
+
+char *
+xstrcatdup(const char *a, const char *b, const char *c)
+{
+ return t_xstrcatdup(a, b, c);
+}
+
+char *
+xstrcatdup(const char *a, const char *b, const char *c, const char *d)
+{
+ return t_xstrcatdup(a, b, c, d);
+}
diff --git a/src/util/Alloc.hxx b/src/util/Alloc.hxx
index 15c123b7a..654b7d0fe 100644
--- a/src/util/Alloc.hxx
+++ b/src/util/Alloc.hxx
@@ -64,4 +64,23 @@ gcc_malloc gcc_nonnull_all
char *
xstrndup(const char *s, size_t n);
+/**
+ * Concatenate two strings, returning a new allocation. Use free() to
+ * free it.
+ *
+ * This function never fails; in out-of-memory situations, it aborts
+ * the process.
+ */
+gcc_malloc gcc_nonnull_all
+char *
+xstrcatdup(const char *a, const char *b);
+
+gcc_malloc gcc_nonnull_all
+char *
+xstrcatdup(const char *a, const char *b, const char *c);
+
+gcc_malloc gcc_nonnull_all
+char *
+xstrcatdup(const char *a, const char *b, const char *c, const char *d);
+
#endif