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-rw-r--r--libbuild2/utility.ixx21
1 files changed, 21 insertions, 0 deletions
diff --git a/libbuild2/utility.ixx b/libbuild2/utility.ixx
index 2846756..514d4ee 100644
--- a/libbuild2/utility.ixx
+++ b/libbuild2/utility.ixx
@@ -2,6 +2,8 @@
// copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
+#include <cstring> // strlen() strchr()
+
namespace build2
{
inline void
@@ -152,4 +154,23 @@ namespace build2
{
return find_option_prefixes (ps, s[var], ic);
}
+
+ inline size_t
+ find_stem (const string& s, size_t s_p, size_t s_n,
+ const char* stem, const char* seps)
+ {
+ auto sep = [seps] (char c) -> bool
+ {
+ return strchr (seps, c) != nullptr;
+ };
+
+ size_t m (strlen (stem));
+ size_t p (s.find (stem, s_p, m));
+
+ return (p != string::npos &&
+ ( p == s_p || sep (s[p - 1])) && // Separated beginning.
+ ((p + m) == s_n || sep (s[p + m]))) // Separated end.
+ ? p
+ : string::npos;
+ }
}