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Shell Programming and Scripting
Difference operator
Post 302377525 by Franklin52 on Friday 4th of December 2009 09:16:34 AM
12-04-2009
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LEARN ABOUT DEBIAN
gd_bof
gd_bof(3) GETDATA gd_bof(3) NAME
gd_bof -- report the start of data in a field SYNOPSIS
#include <getdata.h> off_t gd_bof(DIRFILE *dirfile, const char *field_code); DESCRIPTION
The gd_bof() function queries a dirfile(5) database specified by dirfile and returns the sample number of the beginning-of-field marker for the vector field given by field_code. The caller should not assume that the beginning-of-field marker falls on a frame boundary. The beginning-of-field marker is never nega- tive. For a RAW field, the beginning-of-field corresponds to the frame offset of that field (see gd_frameoffset(3)). The beginning-of-field for all other vector field type is the same as the beginning-of-field of whichever of its input fields that starts latest. The beginning-of- field marker for the special field INDEX is always zero. The beginning-of-field marker for a field containing no data is in the same location as, or after, its end-of-field marker (see gd_eof(3)). For a RAW field, the difference between the locations of the beginning- and end-of-field markers indicates the number of samples of data actually stored on disk. The dirfile argument must point to a valid DIRFILE object previously created by a call to gd_open(3). RETURN VALUE
Upon successful completion, gd_bof() returns the sample number of the end-of-field marker for the indicated field. On error, it returns -1 and sets the dirfile error to a non-zero error value. Possible error values are: GD_E_BAD_CODE The field specified by field_code or one of the fields it uses as input was not found in the database. GD_E_BAD_DIRFILE The supplied dirfile was invalid. GD_E_BAD_REPR The representation suffix specified in field_code, or in one of its inputs was not recognised. GD_E_DIMENSION A scalar field was found where a vector field was expected in the definition of field_code or one of its inputs, or else field_code itself specified a scalar field. GD_E_RECURSE_LEVEL Too many levels of recursion were encountered while trying to resolve field_code. This usually indicates a circular dependency in field specification in the dirfile. The dirfile error may be retrieved by calling gd_error(3). A descriptive error string for the last error encountered can be obtained from a call to gd_error_string(3). SEE ALSO
dirfile(5), dirfile-encoding(5), gd_open(3), gd_eof(3), gd_error(3), gd_error_string(3), gd_nframes(3) Version 0.7.0 15 October 2010 gd_bof(3)