Skip trailing whitespace in mtl. Fixes #92.

models/issue-92.mtl

@@ -0,0 +1,6 @@
+newmtl default
+Ka 0 0 0
+Kd 0 0 0
+Ks 0 0 0
+map_Kd tmp.png 
+

models/issue-92.obj

@@ -0,0 +1,7 @@
+mtllib issue-92.mtl
+o Test
+v 1.864151 -1.219172 -5.532511
+v 0.575869 -0.666304 5.896140
+v 0.940448 1.000000 -1.971128
+usemtl default
+f 1 2 3

tests/tester.cc

@@ -351,6 +351,22 @@ TEST_CASE("stream_load", "[Stream]") {
     REQUIRE(true == TestStreamLoadObj());
 }
 
+TEST_CASE("trailing_whitespace_in_mtl", "[Issue92]") {
+  tinyobj::attrib_t attrib;
+  std::vector<tinyobj::shape_t> shapes;
+  std::vector<tinyobj::material_t> materials;
+
+  std::string err;
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "../models/issue-92.obj", gMtlBasePath);
+
+  if (!err.empty()) {
+    std::cerr << err << std::endl;
+  }
+  REQUIRE(true == ret);
+  REQUIRE(1 == materials.size());
+  REQUIRE(0 == materials[0].diffuse_texname.compare("tmp.png"));
+}
+
 #if 0
 int
 main(

tiny_obj_loader.h

@@ -534,8 +534,7 @@ static vertex_index parseTriple(const char **token, int vsize, int vnsize,
 
 // Parse raw triples: i, i/j/k, i//k, i/j
 static vertex_index parseRawTriple(const char **token) {
-  vertex_index vi(
-      static_cast<int>(0));  // 0 is an invalid index in OBJ
+  vertex_index vi(static_cast<int>(0));  // 0 is an invalid index in OBJ
 
   vi.v_idx = atoi((*token));
   (*token) += strcspn((*token), "/ \t\r");
@@ -679,6 +678,11 @@ void LoadMtl(std::map<std::string, int> *material_map,
 
     std::string linebuf(&buf[0]);
 
+    // Trim trailing whitespace.
+    if (linebuf.size() > 0) {
+      linebuf = linebuf.substr(0, linebuf.find_last_not_of(" \t") + 1);
+    }
+
     // Trim newline '\r\n' or '\n'
     if (linebuf.size() > 0) {
       if (linebuf[linebuf.size() - 1] == '\n')