compat/fopen.c

   1 /*
   2  *  The order of the following two lines is important.
   3  *
   4  *  SUPPRESS_FOPEN_REDEFINITION is defined before including git-compat-util.h
   5  *  to avoid the redefinition of fopen within git-compat-util.h. This is
   6  *  necessary since fopen is a macro on some platforms which may be set
   7  *  based on compiler options. For example, on AIX fopen is set to fopen64
   8  *  when _LARGE_FILES is defined. The previous technique of merely undefining
   9  *  fopen after including git-compat-util.h is inadequate in this case.
  10  */
  11 #define SUPPRESS_FOPEN_REDEFINITION
  12 #include "../git-compat-util.h"
  13
  14 FILE *git_fopen(const char *path, const char *mode)
  15 {
  16         FILE *fp;
  17         struct stat st;
  18
  19         if (mode[0] == 'w' || mode[0] == 'a')
  20                 return fopen(path, mode);
  21
  22         if (!(fp = fopen(path, mode)))
  23                 return NULL;
  24
  25         if (fstat(fileno(fp), &st)) {
  26                 fclose(fp);
  27                 return NULL;
  28         }
  29
  30         if (S_ISDIR(st.st_mode)) {
  31                 fclose(fp);
  32                 errno = EISDIR;
  33                 return NULL;
  34         }
  35
  36         return fp;
  37 }