preproc supports GNU-processed C pipe from stdin

1 files changed, 31 insertions, 13 deletions

diff --git a/tools/preproc/c_file.cpp b/tools/preproc/c_file.cpp
index 229f568fa..3a026d0d2 100644
--- a/tools/preproc/c_file.cpp
+++ b/tools/preproc/c_file.cpp
@@ -22,6 +22,9 @@
 #include <cstdarg>
 #include <string>
 #include <memory>
+#include <iostream>
+#include <iterator>
+#include <cstring>
 #include "preproc.h"
 #include "c_file.h"
 #include "char_util.h"
@@ -30,28 +33,43 @@
 
 CFile::CFile(std::string filename) : m_filename(filename)
 {
-    FILE *fp = std::fopen(filename.c_str(), "rb");
+    if (filename == "-") {
+        std::string s;
+
+        while (!std::cin.eof()) {
+            std::string b;
+            std::getline(std::cin, b);
+            b += "\n";
+            s += b;
+        }
+        m_size = s.size();
+        m_buffer = new char[m_size + 1];
+        memcpy(m_buffer, s.c_str(), m_size);
+        m_buffer[m_size] = 0;
+    } else {
+        FILE *fp = std::fopen(filename.c_str(), "rb");
 
-    if (fp == NULL)
-        FATAL_ERROR("Failed to open \"%s\" for reading.\n", filename.c_str());
+        if (fp == NULL)
+            FATAL_ERROR("Failed to open \"%s\" for reading.\n", filename.c_str());
 
-    std::fseek(fp, 0, SEEK_END);
+        std::fseek(fp, 0, SEEK_END);
 
-    m_size = std::ftell(fp);
+        m_size = std::ftell(fp);
 
-    if (m_size < 0)
-        FATAL_ERROR("File size of \"%s\" is less than zero.\n", filename.c_str());
+        if (m_size < 0)
+            FATAL_ERROR("File size of \"%s\" is less than zero.\n", filename.c_str());
 
-    m_buffer = new char[m_size + 1];
+        m_buffer = new char[m_size + 1];
 
-    std::rewind(fp);
+        std::rewind(fp);
 
-    if (std::fread(m_buffer, m_size, 1, fp) != 1)
-        FATAL_ERROR("Failed to read \"%s\".\n", filename.c_str());
+        if (std::fread(m_buffer, m_size, 1, fp) != 1)
+            FATAL_ERROR("Failed to read \"%s\".\n", filename.c_str());
 
-    m_buffer[m_size] = 0;
+        m_buffer[m_size] = 0;
 
-    std::fclose(fp);
+        std::fclose(fp);
+    }
 
     m_pos = 0;
     m_lineNum = 1;