add replace_char() method to SkString API (skbug.com/2651)

src/core/SkString.cpp

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "SkString.h"
@@ skipping 537 matching lines @@
     SkASSERT(p >= buffer);
     this->insert(offset, p, buffer + sizeof(buffer) - p);
 }
 
 void SkString::insertScalar(size_t offset, SkScalar value) {
     char    buffer[SkStrAppendScalar_MaxSize];
     char*   stop = SkStrAppendScalar(buffer, value);
     this->insert(offset, buffer, stop - buffer);
 }
 
+void SkString::replaceChar(char oldChar, char newChar) {
+    if (this->isEmpty() || oldChar == newChar) {
+        return;
+    }
+    size_t len = this->size();
+    char* writable = this->writable_str();
+    for (size_t i = 0 ; i < len ; ++i) {
+        if (oldChar == writable[i]) {
+            writable[i] = newChar;
+        }
+    }
+}
+
 void SkString::printf(const char format[], ...) {
     char    buffer[kBufferSize];
     ARGS_TO_BUFFER(format, buffer, kBufferSize);
 
     this->set(buffer, strlen(buffer));
 }
 
 void SkString::appendf(const char format[], ...) {
     char    buffer[kBufferSize];
     ARGS_TO_BUFFER(format, buffer, kBufferSize);
@@ skipping 73 matching lines @@
         const size_t len = strcspn(str, delimiters);
         out->push_back().set(str, len);
         str += len;
         // Skip any delimiters.
         str += strspn(str, delimiters);
     }
 }
 
 #undef VSNPRINTF
 #undef SNPRINTF