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comparison uptools/atcmd/smsend_concat.c @ 370:076d533f840d

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fcup-smsend: implemented automatic concat SMS refno generation
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 08 Mar 2018 17:47:58 +0000
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369:06cf82710cca 370:076d533f840d
1 /*
2 * This module contains the messy code for automatic generation and
3 * increment of concat SMS reference numbers.
4 */
5
6 #include <sys/types.h>
7 #include <sys/param.h>
8 #include <sys/file.h>
9 #include <sys/time.h>
10 #include <ctype.h>
11 #include <stdio.h>
12 #include <stdlib.h>
13 #include <unistd.h>
14 #include "../../rvinterf/include/exitcodes.h"
15
16 static int
17 initial_seed()
18 {
19 struct timeval tv;
20 u_char refno, *cp, *endp;
21
22 gettimeofday(&tv, 0);
23 cp = (u_char *) &tv;
24 endp = cp + sizeof(struct timeval);
25 refno = 0;
26 while (cp < endp)
27 refno ^= *cp++;
28 return refno;
29 }
30
31 get_concsms_refno_from_host_fs()
32 {
33 char *homedir, statefile[MAXPATHLEN];
34 int fd, cc;
35 char buf[6];
36 u_char refno;
37
38 homedir = getenv("HOME");
39 if (!homedir) {
40 fprintf(stderr,
41 "error: no HOME= defined, needed for concat SMS refno\n");
42 exit(ERROR_UNIX);
43 }
44 sprintf(statefile, "%s/.concat_sms_refno", homedir);
45 fd = open(statefile, O_RDWR|O_CREAT, 0666);
46 if (fd < 0) {
47 perror(statefile);
48 exit(ERROR_UNIX);
49 }
50 cc = read(fd, buf, 5);
51 if (cc == 5 && buf[0] == '0' && buf[1] == 'x' && isxdigit(buf[2]) &&
52 isxdigit(buf[3]) && buf[4] == '\n')
53 refno = strtoul(buf, 0, 16) + 1;
54 else
55 refno = initial_seed();
56 sprintf(buf, "0x%02X\n", refno);
57 lseek(fd, 0, SEEK_SET);
58 write(fd, buf, 5);
59 close(fd);
60 return refno;
61 }