FreeCalypso > hg > freecalypso-tools

annotate uptools/atcmd/smsend_concat.c @ 416:30f6d1c32c6f

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doc/Flash-boot-defect article removed (no longer relevant) This article is no longer relevant because the issue in question only affected one (1) defective FCDEV3B board which was not and never will be sold.
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 26 Oct 2018 07:11:08 +0000
parents 076d533f840d
children
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076d533f840d fcup-smsend: implemented automatic concat SMS refno generation
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1 /*
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2 * This module contains the messy code for automatic generation and
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3 * increment of concat SMS reference numbers.
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4 */
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5
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6 #include <sys/types.h>
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7 #include <sys/param.h>
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8 #include <sys/file.h>
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9 #include <sys/time.h>
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10 #include <ctype.h>
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11 #include <stdio.h>
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12 #include <stdlib.h>
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13 #include <unistd.h>
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14 #include "../../rvinterf/include/exitcodes.h"
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15
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16 static int
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17 initial_seed()
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18 {
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19 struct timeval tv;
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20 u_char refno, *cp, *endp;
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21
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22 gettimeofday(&tv, 0);
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23 cp = (u_char *) &tv;
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24 endp = cp + sizeof(struct timeval);
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25 refno = 0;
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26 while (cp < endp)
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27 refno ^= *cp++;
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28 return refno;
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29 }
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30
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31 get_concsms_refno_from_host_fs()
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32 {
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33 char *homedir, statefile[MAXPATHLEN];
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34 int fd, cc;
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35 char buf[6];
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36 u_char refno;
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37
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38 homedir = getenv("HOME");
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39 if (!homedir) {
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40 fprintf(stderr,
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41 "error: no HOME= defined, needed for concat SMS refno\n");
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42 exit(ERROR_UNIX);
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43 }
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44 sprintf(statefile, "%s/.concat_sms_refno", homedir);
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45 fd = open(statefile, O_RDWR|O_CREAT, 0666);
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46 if (fd < 0) {
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47 perror(statefile);
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48 exit(ERROR_UNIX);
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49 }
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50 cc = read(fd, buf, 5);
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51 if (cc == 5 && buf[0] == '0' && buf[1] == 'x' && isxdigit(buf[2]) &&
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52 isxdigit(buf[3]) && buf[4] == '\n')
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53 refno = strtoul(buf, 0, 16) + 1;
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54 else
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55 refno = initial_seed();
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56 sprintf(buf, "0x%02X\n", refno);
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57 lseek(fd, 0, SEEK_SET);
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58 write(fd, buf, 5);
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59 close(fd);
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60 return refno;
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61 }