From 73658a7629e618f779112949e653ca04a0627441 Mon Sep 17 00:00:00 2001
From: James Rowe <jroweboy@gmail.com>
Date: Thu, 16 Mar 2017 21:00:16 -0600
Subject: [PATCH] Move TrimSourcePath to string_util

---
 src/common/string_util.cpp | 22 ++++++++++++++++++++++
 src/common/string_util.h   | 12 ++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/src/common/string_util.cpp b/src/common/string_util.cpp
index bad311793..9d5ae5bb4 100644
--- a/src/common/string_util.cpp
+++ b/src/common/string_util.cpp
@@ -462,4 +462,26 @@ std::string StringFromFixedZeroTerminatedBuffer(const char* buffer, size_t max_l
 
     return std::string(buffer, len);
 }
+
+const char* TrimSourcePath(const char* path, const char* root) {
+    const char* p = path;
+
+    while (*p != '\0') {
+        const char* next_slash = p;
+        while (*next_slash != '\0' && *next_slash != '/' && *next_slash != '\\') {
+            ++next_slash;
+        }
+
+        bool is_src = Common::ComparePartialString(p, next_slash, root);
+        p = next_slash;
+
+        if (*p != '\0') {
+            ++p;
+        }
+        if (is_src) {
+            path = p;
+        }
+    }
+    return path;
+}
 }
diff --git a/src/common/string_util.h b/src/common/string_util.h
index 075bf4ecb..f340e321d 100644
--- a/src/common/string_util.h
+++ b/src/common/string_util.h
@@ -134,4 +134,16 @@ bool ComparePartialString(InIt begin, InIt end, const char* other) {
  * NUL-terminated then the string ends at max_len characters.
  */
 std::string StringFromFixedZeroTerminatedBuffer(const char* buffer, size_t max_len);
+
+/**
+ * Attempts to trim an arbitrary prefix from `path`, leaving only the part starting at `root`. It's
+ * intended to be used to strip a system-specific build directory from the `__FILE__` macro,
+ * leaving only the path relative to the sources root.
+ *
+ * @param path The input file path as a null-terminated string
+ * @param root The name of the root source directory as a null-terminated string. Path up to and
+ *             including the last occurrence of this name will be stripped
+ * @return A pointer to the same string passed as `path`, but starting at the trimmed portion
+ */
+const char* TrimSourcePath(const char* path, const char* root = "src");
 }