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43 lines
1.2 KiB
Groff
43 lines
1.2 KiB
Groff
.TH cdb_find 3
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.SH NAME
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cdb_find \- look up a key in a constant database
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.SH SYNTAX
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.B #include <libowfat/cdb.h>
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.br
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.B #include <libowfat/uint32.h>
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int cdb_find(struct cdb *\fIc\fR, char *\fIkey\fR, size_t \fIkeylen\fR);
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.br
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int cdb_datalen(struct cdb *\fIc\fR);
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.br
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int cdb_datapos(struct cdb *\fIc\fR);
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.br
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int cdb_findnext(struct cdb *\fIc\fR, char *\fIkey\fR, size_t \fIkeylen\fR);
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.SH DESCRIPTION
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\fBcdb_find\fR looks for \fIkey\fR. If cdb_find returns 0, the database
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does not contain that key; stop. If cdb_find returns -1, there was a
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read error; abort.
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\fBcdb_datalen\fR returns the length of the data associated with the
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\fIkey\fR. Use it to allocate a pointer \fIp\fR with enough space to
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hold the data.
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\fBcdb_datapos\fR returns the position of the data inside the file. Use
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it as argument to cdb_read to retrieve the data.
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There may be several records under a single key. You can use
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\fBcdb_findnext\fR to find the next record under this key.
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.SH EXAMPLE
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static struct c;
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if (cdb_find(&c,key,strlen(key)>0) {
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char *buf=alloca(cdb_datalen(&c));
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cdb_read(&c,buf,cdb_datalen(&c),cdb_datapos(&c));
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write(1,buf,cdb_datalen(&c));
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.br
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}
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.SH "SEE ALSO"
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cdb_read(3), cdb_init(3), cdb_free(3), cdbmake(1)
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