src/base/string/input/cl_st_gettoken.cc

   1 // operator>>.
   2
   3 // General includes.
   4 #include "cl_sysdep.h"
   5
   6 // Specification.
   7 #include "cl_string.h"
   8
   9
  10 // Implementation.
  11
  12 #ifdef CL_IO_IOSTREAM
  13
  14 #include "cl_io.h"
  15 #include "cl_spushstring.h"
  16 #include <ctype.h>
  17
  18 #if ((defined(__sparc__) || defined(__rs6000__) || defined(__mips__)) && !defined(__GNUC__))
  19 // Sun C++ doesn't have istream::unget().
  20   #define unget()  putback(c)
  21 #endif
  22
  23 cl_istream operator>> (cl_istream stream, cl_string& str)
  24 {
  25         var cl_spushstring buffer;
  26         var int n = stream.width();
  27         // Handling of eofp is tricky: EOF is reached when (!stream.good()) || (stream.get()==EOF).
  28         int c;
  29         // Skip whitespace.
  30         while (stream.good()) {
  31                 c = stream.get();
  32                 if (c==EOF)
  33                         break;
  34                 if (!isspace(c)) {
  35                         if (--n == 0) {
  36                                 // stream.width()==1, means no characters.
  37                                 stream.unget();
  38                                 break;
  39                         }
  40                         // If stream.width()==0, n gets negative and never 0.
  41                         goto nonws;
  42                 }
  43         }
  44         goto done;
  45         // Read non-whitespace.
  46         while (stream.good()) {
  47                 c = stream.get();
  48                 if (c==EOF)
  49                         break;
  50                 if (isspace(c)) {
  51                         stream.unget();
  52                         break;
  53                 }
  54             nonws:
  55                 buffer.push(c);
  56                 if (--n == 0)
  57                         break;
  58         }
  59     done:
  60         str = buffer.contents();
  61         stream.width(0);
  62         return stream;
  63 }
  64
  65 #endif