gd_nfields(3)

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9gd_nentries(3)                      GETDATA                     gd_nentries(3)
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NAME

14       gd_nentries,      gd_nfields,      gd_nfields_by_type      gd_nmfields,
15       gd_nmfields_by_type, gd_nmvectors, gd_nvectors — count field entries in
16       a Dirfile
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18

SYNOPSIS

20       #include <getdata.h>
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22       unsigned int gd_nentries(DIRFILE *dirfile, const char *parent, unsigned
23              int type, unsigned int flags);
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25       unsigned int gd_nfields(DIRFILE *dirfile);
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27       unsigned int gd_nfields_by_type(DIRFILE *dirfile, gd_entype_t type);
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29       unsigned int gd_nmfields(DIRFILE *dirfile, const char *parent);
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31       unsigned int gd_nmfields_by_type(DIRFILE *dirfile, const char *parent,
32              gd_entype_t type);
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34       unsigned int gd_nmvectors(DIRFILE *dirfile, const char *parent);
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36       unsigned int gd_nvectors(DIRFILE *dirfile);
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DESCRIPTION

40       The  gd_nentries()  function queries a dirfile(5) database specified by
41       dirfile and counts the number of metadata entries satisfying  the  pro‐
42       vided  criteria.   If  parent  is  non-NULL, metafields under the field
43       specified by parent are considered;  otherwise,  top-level  fields  are
44       considered, and metafields ignored.
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46       The  type argument should be one of the following symbols indicating an
47       explicit entry type to count:
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49              GD_BIT_ENTRY, GD_CARRAY_ENTRY, GD_CONST_ENTRY, GD_DIVIDE_ENTRY,
50              GD_INDEX_ENTRY, GD_INDIR_ENTRY, GD_LINCOM_ENTRY,
51              GD_LINTERP_ENTRY, GD_MPLEX_ENTRY, GD_MULTIPLY_ENTRY,
52              GD_PHASE_ENTRY, GD_POLYNOM_ENTRY, GD_RAW_ENTRY, GD_RECIP_ENTRY,
53              GD_SARRAY_ENTRY, GD_SBIT_ENTRY, GD_SINDIR_ENTRY,
54              GD_STRING_ENTRY, GD_WINDOW_ENTRY.
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56       (GD_INDEX_ENTRY  is  a special field type for the implicit INDEX field)
57       or else one of the following special symbols:
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59       GD_ALL_ENTRIES (=0)
60               Count entries of all types.
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62       GD_ALIAS_ENTRIES
63               Count only aliases.  This is the only way to get  a  count  in‐
64               cluding aliases which do not point to valid field codes.
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66       GD_SCALAR_ENTRIES
67               Count only scalar field types (CONST, CARRAY, SARRAY, STRING).
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69       GD_VECTOR_ENTRIES
70               Count  only  numeric-valued vector field types (all field types
71               except SINDIR and the scalar field types listed above).
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73       The flags argument should be zero or more of the following flags,  bit‐
74       wise or'd together:
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76       GD_ENTRIES_HIDDEN
77               Include hidden entries (see gd_hidden(3)) in the count: normal‐
78               ly hidden entries are skipped;
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80       GD_ENTRIES_NOALIAS
81               Exclude aliases from the count: normally aliases are considered
82               the same as their target (that is: a field with n aliases, plus
83               its canonical name, will be counted n+1 times).
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86       This  function   has   a   subset   of   the   functionality   of   the
87       gd_match_entries(3) function (q.v.).
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90   Special Cases
91       The call
92              gd_nfields(dirfile);
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94       is equivalent to
95              gd_nentries(dirfile, NULL, GD_ALL_ENTRIES, 0);
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97       The call
98              gd_nfields_by_type(dirfile, type);
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100       is equivalent to
101              gd_nentries(dirfile, NULL, type, 0);
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103       The call
104              gd_nmfields(dirfile, parent);
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106       is equivalent to
107              gd_nentries(dirfile, parent, GD_ALL_ENTRIES, 0);
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109       The call
110              gd_nmfields_by_type(dirfile, parent, type);
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112       is equivalent to
113              gd_nentries(dirfile, parent, type, 0);
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115       The call
116              gd_nmvectors(dirfile, parent);
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118       is equivalent to
119              gd_nentries(dirfile, parent, GD_VECTOR_ENTRIES, 0);
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121       The call
122              gd_nvectors(dirfile);
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124       is equivalent to
125              gd_nentries(dirfile, NULL, GD_VECTOR_ENTRIES, 0);
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RETURN VALUE

129       Upon successful completion, these functions return an unsigned in indi‐
130       cating the number of entries in the database  satisfying  the  supplied
131       criteria.
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133       On error, these functions return zero and store a negative-valued error
134       code in the DIRFILE object which may be retrieved by a subsequent  call
135       to gd_error(3).  Possible error codes are:
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137       GD_E_BAD_CODE
138               The  supplied parent field code was not found, or referred to a
139               metafield itself.
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141       GD_E_BAD_DIRFILE
142               The supplied dirfile was invalid.
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144       GD_E_BAD_ENTRY
145               The type parameter supplied was not one of the  symbols  listed
146               above.
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148       A  descriptive  error  string  for the error may be obtained by calling
149       gd_error_string(3).
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HISTORY

153       The get_nfields() function appeared in GetData-0.3.0.
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155       The  get_nfields_by_type(),   get_nmfields(),   get_nmfields_by_type(),
156       get_nmvectors(),   and  get_nvectors()  functions  appeared  in  GetDa‐
157       ta-0.4.0.
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159       In  GetData-0.7.0,  these  functions  were  renamed  to   gd_nfields(),
160       gd_nfields_by_type(),       gd_nmfields(),       gd_nmfields_by_type(),
161       gd_nmvectors(), and gd_nvectors().
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163       The gd_nentries() function appeared in GetData-0.8.0.
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NAME

SYNOPSIS

DESCRIPTION

RETURN VALUE

HISTORY

SEE ALSO