file.cc revision 776ca3085c44e6570813270df75278849c37d400 
1#include "file.h"
2
3#include <fcntl.h>
4#include <sys/stat.h>
5#include <sys/types.h>
6#include <unistd.h>
7
8#include "ast.h"
9#include "log.h"
10#include "parser.h"
11
12Makefile::Makefile(const string& filename)
13    : len_(0), mtime_(0), filename_(filename) {
14  int fd = open(filename.c_str(), O_RDONLY);
15  if (fd < 0) {
16    return;
17  }
18
19  struct stat st;
20  if (fstat(fd, &st) < 0) {
21    PERROR("fstat failed for %s", filename.c_str());
22  }
23
24  len_ = st.st_size;
25  mtime_ = st.st_mtime;
26  buf_ = new char[len_];
27  ssize_t r = read(fd, buf_, len_);
28  if (r != static_cast<ssize_t>(len_)) {
29    if (r < 0)
30      PERROR("read failed for %s", filename.c_str());
31    ERROR("Unexpected read length=%zd expected=%zu", r, len_);
32  }
33
34  if (close(fd) < 0) {
35    PERROR("close failed for %s", filename.c_str());
36  }
37
38  Parse(this);
39}
40
41Makefile::~Makefile() {
42  delete[] buf_;
43  for (AST* ast : asts_)
44    delete ast;
45}
46