Writes the contents of a string to a file.


ret = putf(filename, str, start, len, mode, append)
  • filename (string) – name of output file.
  • str (string) – data to be written to filename. All or part of str may be written out.
  • start (scalar) – beginning position in str of output string.
  • len (scalar) – length of output string.
  • mode (scalar) – output mode, (0) ASCII or (1) binary.
  • append (scalar) – file write mode, (0) overwrite or (1) append.

ret (scalar) –

return code.

0 normal return
1 null file name
2 file open error
3 file write error
4 output string too long
5 null output string, or illegal mode value
6 illegal append value
  1. append specified but file did not exist; file was created (warning only)


If mode is set to (1) binary, a string of length len will be written to filename. If mode is set to (0) ASCII, the string will be output up to length len or until putf() encounters a ^Z (ASCII 26) in str. The ^Z will not be written to filename.

If append is set to (0) overwrite, the current contents of filename will be destroyed. If append is set to (1) append, filename will be created if it does not already exist.

If an error occurs, putf() will either return an error code or terminate the program with an error message, depending on the trap state. If bit 2 (the 4’s bit) of the trap flag is 0, putf() will terminate with an error message. If bit 2 of the trap flag is 1, putf() will return an error code. The value of the trap flag can be tested with trapchk.



See also

Functions getf()