Move trim(), next_word() basic string utilities from build2

1 files changed, 37 insertions, 1 deletions

diff --git a/libbutl/utility.cxx b/libbutl/utility.cxx
index c8e4e85..4645b68 100644
--- a/libbutl/utility.cxx
+++ b/libbutl/utility.cxx
@@ -35,7 +35,6 @@ import std.io;
 
 #endif
 
-
 namespace butl
 {
   using namespace std;
@@ -88,6 +87,43 @@ namespace butl
                         win32::error_msg (system_code));
 #endif
   }
+
+  string&
+  trim (string& l)
+  {
+    /*
+    assert (trim (r = "") == "");
+    assert (trim (r = " ") == "");
+    assert (trim (r = " \t\r") == "");
+    assert (trim (r = "a") == "a");
+    assert (trim (r = " a") == "a");
+    assert (trim (r = "a ") == "a");
+    assert (trim (r = " \ta") == "a");
+    assert (trim (r = "a \r") == "a");
+    assert (trim (r = " a ") == "a");
+    assert (trim (r = " \ta \r") == "a");
+    */
+
+    size_t i (0), n (l.size ());
+
+    for (char c;
+         i != n && ((c = l[i]) == ' ' || c == '\t' || c == '\r');
+         ++i) ;
+
+    for (char c;
+         n != i && ((c = l[n - 1]) == ' ' || c == '\t' || c == '\r');
+         --n) ;
+
+    if (i != 0)
+    {
+      string s (l, i, n - i);
+      l.swap (s);
+    }
+    else if (n != l.size ())
+      l.resize (n);
+
+    return l;
+  }
 }
 
 namespace std