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comparison libutil/open_ts.c @ 1:570252e22630

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libutil: timeslot opening function
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 23 Jun 2024 07:28:51 +0000
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0:76b593a6265c 1:570252e22630
1 /*
2 * The function in this common module is responsible for parsing the
3 * user-supplied E1 timeslot specification and then opening that ts
4 * in osmo-e1d.
5 *
6 * This code is based on osmo-e1d-pipe,
7 * (C) 2020-2022 by Harald Welte <laforge@osmocom.org>,
8 * SPDX-License-Identifier: GPL-2.0+
9 */
10
11 #include <ctype.h>
12 #include <stdint.h>
13 #include <stdbool.h>
14 #include <stdio.h>
15 #include <stdlib.h>
16
17 #include <osmocom/e1d/proto_clnt.h>
18
19 #include "open_ts.h"
20
21 static int parse_component(const char *str, const char **outp, uint8_t *var)
22 {
23 if (!isdigit(*str))
24 return -1;
25 *var = atoi(str);
26 while (isdigit(*str))
27 str++;
28 *outp = str;
29 return 0;
30 }
31
32 int open_e1d_ts(struct osmo_e1dp_client *e1_client, const char *ts_spec)
33 {
34 uint8_t intf_nr, line_nr, ts_nr;
35 const char *cp;
36 int fd;
37
38 if (parse_component(ts_spec, &cp, &intf_nr) < 0) {
39 inv_syntax: fprintf(stderr, "error: invalid timeslot spec \"%s\"\n",
40 ts_spec);
41 exit(1);
42 }
43 if (*cp++ != ':')
44 goto inv_syntax;
45 if (parse_component(cp, &cp, &line_nr) < 0)
46 goto inv_syntax;
47 if (*cp++ != ':')
48 goto inv_syntax;
49 if (parse_component(cp, &cp, &ts_nr) < 0)
50 goto inv_syntax;
51 if (*cp)
52 goto inv_syntax;
53 fd = osmo_e1dp_client_ts_open(e1_client, intf_nr, line_nr, ts_nr,
54 E1DP_TSMODE_RAW, 160);
55 if (fd < 0) {
56 fprintf(stderr, "error: failed to open E1 ts %s\n", ts_spec);
57 exit(1);
58 }
59 return fd;
60 }