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.\" ========================================================================
.\"
.IX Title "DBFP_QUERY_LOCATION 3"
.TH DBFP_QUERY_LOCATION 3 "2016-06-08" "0.1.0" "DB timetable API"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
dbfp_query_loation \- get a list of stations matching a string from the DB
timetable API
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <dbfp.h>
\&
\& int dbfp_query_location(struct dbfp *dbfp, char *input, size_t *n,
\& struct dbfp_location **locations);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBdbfp_query_location\fR queries a list of locations matching the query string
\&\fIinput\fR from the \s-1DB\s0 timetable \s-1API\s0 using the connection metadata stored in
\&\fIdbfp\fR. The number of results is stored in \fIn\fR. The results are stored in
\&\fIlocations\fR. The memory for the \fIlocations\fR is allocated by the function.
The stored array contains exactly \fIn\fR elements, and is not \s-1NULL\s0 terminated.
.PP
\&\fIdbfp\fR, \fIinput\fR, \fIn\fR and \fIlocations\fR must not be \s-1NULL. \s0\fIdbfp\fR must have
been initialized with \fIdbfp_init\fR. The elements in \fIlocations\fR should be
closed with \fIdbfp_location_close\fR. \fIlocations\fR should be freed by the
caller.
.PP
If the query fails, the values of \fIn\fR and \fIlocations\fR are set to 0 and \s-1NULL\s0
respectively.
.PP
The \fBdbfp_location\fR structure is defined as:
.PP
.Vb 6
\& struct dbfp_location {
\& char *name;
\& char *id;
\& float lon;
\& float lat;
\& };
.Ve
.PP
\&\fIname\fR is the name of the station. \fIid\fR is the \s-1DB\s0 id of the station. It
seems to be an integer, but this is not guaranteed. \fIlon\fR and \fIlat\fR are the
coordinates of the station.
.SH "RETURN VALUE"
.IX Header "RETURN VALUE"
\&\fBdbfp_query_location\fR returns zero if successful, or a non-zero error code.
Positive error codes are from \fIerrno.h\fR, negative error codes are specific
to dbfp.
.SH "ERRORS"
.IX Header "ERRORS"
.IP "\s-1EINVAL\s0" 4
.IX Item "EINVAL"
if \fIdbfp\fR, \fIinput\fR, \fIn\fR or \fIlocations\fR is \s-1NULL\s0
.IP "\s-1ENOMEM\s0" 4
.IX Item "ENOMEM"
if there is not enough memory to store the results of the query
.IP "\s-1DBFP_ERROR_CURL\s0" 4
.IX Item "DBFP_ERROR_CURL"
if an error occured during the preparation or execution of the network request
.IP "\s-1DBFP_ERROR_FORMAT\s0" 4
.IX Item "DBFP_ERROR_FORMAT"
if an error occurs during the formatting of the \s-1URL\s0
.IP "\s-1DBFP_ERROR_PARSE\s0" 4
.IX Item "DBFP_ERROR_PARSE"
if an error occurs during the parsing of the \s-1XML\s0 response
.IP "\s-1DBFP_ERROR_STRUCTURE\s0" 4
.IX Item "DBFP_ERROR_STRUCTURE"
if the \s-1API\s0 response has not the expected structure
.SH "EXAMPLE"
.IX Header "EXAMPLE"
.Vb 3
\& #include <dbfp.h>
\& #include <stdio.h>
\& #include <stdlib.h>
\&
\& int main(int argc, char **argv)
\& {
\& int err = 0;
\& struct dbfp dbfp;
\& struct dbfp_location *locations = NULL;
\& size_t n = 0;
\& size_t i;
\&
\& err = dbfp_init(&dbfp, "API key");
\& if (err)
\& goto cleanup;
\& err = dbfp_query_location(&dbfp, "Freibu", &n, &locations);
\& if (err)
\& goto cleanup;
\&
\& printf("Number of matches: %zu\en", n);
\& for (i = 0; i < n; i++)
\& printf("%s: %s (%.2f, %.2f)", locations[i].id,
\& locations[i].name, locations[i].lon,
\& locations[i].lat);
\&
\& cleanup:
\& for (i = 0; i < n; i++)
\& dbfp_location_close(&locations[i]);
\& free(locations);
\& dbfp_close(&dbfp);
\&
\& return err ? EXIT_FAILURE : EXIT_SUCCESS;
\& }
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIdbfp_init\fR\|(3), \fIdbfp_location_close\fR\|(3)
|
