FreeCalypso > hg > freecalypso-tools
annotate uptools/atcmd/smsend_concat.c @ 472:368ffb8a08e5
CHANGES: CC= and CFLAGS= override-ability documented
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Tue, 12 Feb 2019 00:30:37 +0000 |
parents | 076d533f840d |
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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 } |