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.\" ========================================================================
.\"
.IX Title "DBFP_INIT 3"
.TH DBFP_INIT 3 "2016-06-06" "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_init \- initialize the metadata for queries to the DB timetable API
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <dbfp.h>
\&
\& int dbfp_init(struct dbfp *dbfp, char *key);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBdbfp_init\fR initializes a \fIdbfp\fR structure that stores the metadata for
queries to the \s-1DB\s0 timetable \s-1API. \s0\fIkey\fR is the \s-1API\s0 key to use for the
connections. \fIdbfp\fR must already be allocated. \fIdbfp\fR and \fIkey\fR must not
be \s-1NULL. \s0\fIkey\fR is copied to the structure, so it can be changed or freed
after calling this function.
.PP
\&\fBdbfp\fR is a structure defined as:
.PP
.Vb 4
\& struct dbfp {
\& char *key;
\& CURL *curl;
\& };
.Ve
.PP
The user does not have to deal with the fields of this structure.
.PP
\&\fIdbfp\fR structures initialized with this method should be closed by calling
\&\fBdbfp_close\fR.
.SH "RETURN VALUE"
.IX Header "RETURN VALUE"
\&\fBdbfp_init\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 or \fIkey\fR is \s-1NULL\s0
.IP "\s-1ENOMEM\s0" 4
.IX Item "ENOMEM"
if there is not enoguh memory to copy \fIkey\fR to \fIdbfp\fR
.IP "\s-1DBFP_ERROR_CURL\s0" 4
.IX Item "DBFP_ERROR_CURL"
if curl could not be initialized
.SH "EXAMPLE"
.IX Header "EXAMPLE"
.Vb 4
\& #include <dbfp.h>
\& #include <stdio.h>
\& #include <stdlib.h>
\& #include <string.h>
\&
\& int main(int argc, char **argv)
\& {
\& struct dbfp dbfp;
\& int err;
\&
\& err = dbfp_init(&dbfp, "API key");
\& if (!err)
\& printf("DBFP structure created.\en");
\& else
\& printf("Could not create DBFP: %s\en", strerror(err));
\& dbfp_close(&dbfp);
\&
\& return err ? EXIT_FAILURE : EXIT_SUCCESS;
\& }
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIdbfp_close\fR\|(3), \fIdbfp_query_location\fR\|(3), \fIdbfp_query_departure\fR\|(3)
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