1 // Copyright 2015 The Shaderc Authors. All rights reserved.
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 #include "libshaderc_util/io.h"
16
17 #include "libshaderc_util/universal_unistd.h"
18
19 #if _WIN32
20 // Need _fileno from stdio.h
21 // Need _O_BINARY and _O_TEXT from fcntl.h
22 #include <fcntl.h>
23 #include <stdio.h>
24 #endif
25
26 #include <errno.h>
27 #include <cstdio>
28 #include <cstring>
29 #include <fstream>
30 #include <iostream>
31
32 namespace {
33
34 // Outputs a descriptive message for errno_value to cerr.
35 // This may be truncated to 1023 bytes on certain platforms.
OutputFileErrorMessage(int errno_value)36 void OutputFileErrorMessage(int errno_value) {
37 #ifdef _MSC_VER
38 // If the error message is more than 1023 bytes it will be truncated.
39 char buffer[1024];
40 strerror_s(buffer, errno_value);
41 std::cerr << ": " << buffer << std::endl;
42 #else
43 std::cerr << ": " << strerror(errno_value) << std::endl;
44 #endif
45 }
46
47 } // anonymous namespace
48
49 namespace shaderc_util {
50
IsAbsolutePath(const std::string & path)51 bool IsAbsolutePath(const std::string& path) {
52 if (path.empty()) return false;
53 // Unix-like OS: /path/to/file
54 if (path.front() == '/') return true;
55 // Windows: \\server\user\file
56 if (path.size() > 1 && path[0] == '\\' && path[1] == '\\') {
57 return true;
58 }
59 // Windows: X:\path\to\file
60 if (path.size() > 2 && ::isalpha(path[0]) && path[1] == ':' &&
61 path[2] == '\\') {
62 return true;
63 }
64 return false;
65 }
66
GetBaseFileName(const std::string & file_path)67 std::string GetBaseFileName(const std::string& file_path) {
68 size_t loc_slash = file_path.find_last_of("/\\");
69 std::string base_name =
70 file_path.substr((loc_slash == std::string::npos ? -1 : loc_slash) + 1);
71 if (base_name == ".." || base_name == ".") {
72 base_name = "";
73 }
74 return base_name;
75 }
76
ReadFile(const std::string & input_file_name,std::vector<char> * input_data)77 bool ReadFile(const std::string& input_file_name,
78 std::vector<char>* input_data) {
79 std::istream* stream = &std::cin;
80 std::ifstream input_file;
81 if (input_file_name != "-") {
82 input_file.open(input_file_name, std::ios_base::binary);
83 stream = &input_file;
84 if (input_file.fail()) {
85 std::cerr << "glslc: error: cannot open input file: '" << input_file_name
86 << "'";
87 if (access(input_file_name.c_str(), R_OK) != 0) {
88 OutputFileErrorMessage(errno);
89 return false;
90 }
91 std::cerr << std::endl;
92 return false;
93 }
94 }
95 *input_data = std::vector<char>((std::istreambuf_iterator<char>(*stream)),
96 std::istreambuf_iterator<char>());
97 return true;
98 }
99
GetOutputStream(const string_piece & output_filename,std::ofstream * file_stream,std::ostream * err)100 std::ostream* GetOutputStream(const string_piece& output_filename,
101 std::ofstream* file_stream, std::ostream* err) {
102 std::ostream* stream = &std::cout;
103 if (output_filename != "-") {
104 file_stream->open(output_filename.str(), std::ios_base::binary);
105 stream = file_stream;
106 if (file_stream->fail()) {
107 *err << "glslc: error: cannot open output file: '" << output_filename
108 << "'";
109 if (access(output_filename.str().c_str(), W_OK) != 0) {
110 OutputFileErrorMessage(errno);
111 return nullptr;
112 }
113 std::cerr << std::endl;
114 return nullptr;
115 }
116 }
117 return stream;
118 }
119
WriteFile(std::ostream * stream,const string_piece & output_data)120 bool WriteFile(std::ostream* stream, const string_piece& output_data) {
121 if (output_data.size() > 0) {
122 stream->write(output_data.data(), output_data.size());
123 if (!stream->good()) {
124 return false;
125 }
126 }
127 stream->flush();
128 return true;
129 }
130
FlushAndSetBinaryModeOnStdout()131 void FlushAndSetBinaryModeOnStdout() {
132 std::fflush(stdout);
133 #if _WIN32
134 _setmode(_fileno(stdout), _O_BINARY);
135 #endif
136 }
137
FlushAndSetTextModeOnStdout()138 void FlushAndSetTextModeOnStdout() {
139 std::fflush(stdout);
140 #if _WIN32
141 _setmode(_fileno(stdout), _O_TEXT);
142 #endif
143 }
144
145 } // namespace shaderc_util
146