std.stdio - D Programming Language - Digital Mars

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Last update Wed Sep 2 00:11:33 2009

# std.stdio

Standard I/O functions that extend std.c.stdio. std.c.stdio is automatically imported when importing std.stdio.

class StdioException: object.Exception;
  Thrown if I/O errors happen.
void writef(...);
  Arguments are formatted per the format strings and written to stdout.
void writefln(...);
  Same as writef, but a newline is appended to the output.
void fwritef(_iobuf* fp,...);
  Same as writef, but output is sent to the stream fp instead of stdout.
void fwritefln(_iobuf* fp,...);
  Same as writefln, but output is sent to the stream fp instead of stdout.
char[] readln(_iobuf* fp = & _iob);
  Read line from stream fp.
  Returns:
  null for end of file, char[] for line read from fp, including terminating '\n'
  Params:

  _iobuf* fp | input stream

  Throws:
  StdioException on error
  Example:
  Reads stdin and writes it to stdout.

      import std.stdio;

      int main()
      {
          char[] buf;
          while ((buf = readln()) != null)
      	writef("%s", buf);
          return 0;
      }

uint readln(_iobuf* fp, ref char[] buf);
uint readln(ref char[] buf);
  Read line from stream fp and write it to buf[], including terminating '\n'.
  This is often faster than readln(FILE*) because the buffer is reused each call. Note that reusing the buffer means that the previous contents of it need to be copied if needed.
  Params:

  _iobuf* fp | input stream
  char[] buf | buffer used to store the resulting line data. buf is resized as necessary.

  Returns:
  0 for end of file, otherwise number of characters read
  Throws:
  StdioException on error
  Example:
  Reads stdin and writes it to stdout.

      import std.stdio;

      int main()
      {
          char[] buf;
          while (readln(stdin, buf))
      	writef("%s", buf);
          return 0;
      }

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