SAS/C Library Reference, Vol. 1

ffixed -- Test for Fixed-Length Records

SYNOPSIS

 #include <lcio.h>

 int ffixed(FILE *f);

DESCRIPTION

ffixed indicates whether an open file contains records of a fixed length.

RETURN VALUE

ffixed returns a nonzero value for a fixed-format file, or 0 for a
variable-format file. VSAM KSDS and ESDS files are considered to be variable-format files, and RRDS and LDS files are considered to be fixed-format files. HFS files are always considered to be variable-format files.

EXAMPLE

For fixed-format files, the sequence number is the last eight characters of the line. For variable-format files, the sequence number is the first eight characters. This program removes the sequence number from a line read from the file input:

  #include <lcio.h>
  #include <string.h>

  char *line;
  FILE *input;

     /* If fixed format,              */
     /* throw away last 8 characters; */
  if (ffixed(input))
     line[strlen(line) - 8 ]  = 0;
     /* else, move string 8 bytes to left. */
  else
     memmove(line, line + 8, strlen(line) - 7);

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