FreeCalypso > hg > sms-coding-utils

annotate enc-text/concat_refno.c @ 30:d7571dc2fecc

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doc: encoder/generator portion is now just one part
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 13 Jun 2024 23:16:04 +0000
parents a16b1b9728f6
children
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2
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Mychaela Falconia <falcon@freecalypso.org>
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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
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15 static int
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16 initial_seed()
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17 {
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18 struct timeval tv;
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19 u_char refno, *cp, *endp;
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20
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21 gettimeofday(&tv, 0);
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22 cp = (u_char *) &tv;
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23 endp = cp + sizeof(struct timeval);
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24 refno = 0;
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25 while (cp < endp)
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26 refno ^= *cp++;
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27 return refno;
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28 }
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29
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30 get_concsms_refno_from_host_fs()
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31 {
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32 char *homedir, statefile[MAXPATHLEN];
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33 int fd, cc;
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34 char buf[6];
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35 u_char refno;
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36
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37 homedir = getenv("HOME");
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38 if (!homedir) {
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39 fprintf(stderr,
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40 "error: no HOME= defined, needed for concat SMS refno\n");
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41 exit(1);
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42 }
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43 sprintf(statefile, "%s/.concat_sms_refno", homedir);
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44 fd = open(statefile, O_RDWR|O_CREAT, 0666);
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45 if (fd < 0) {
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46 perror(statefile);
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47 exit(1);
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48 }
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49 cc = read(fd, buf, 5);
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50 if (cc == 5 && buf[0] == '0' && buf[1] == 'x' && isxdigit(buf[2]) &&
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51 isxdigit(buf[3]) && buf[4] == '\n')
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52 refno = strtoul(buf, 0, 16) + 1;
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53 else
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54 refno = initial_seed();
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55 sprintf(buf, "0x%02X\n", refno);
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56 lseek(fd, 0, SEEK_SET);
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57 write(fd, buf, 5);
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58 close(fd);
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59 return refno;
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60 }