FreeCalypso > hg > freecalypso-tools
view uptools/atcmd/smsend_concat.c @ 654:39b39b546824
libserial-orig: same xram_records baudtab addition as in libserial-newlnx
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Mon, 02 Mar 2020 23:24:43 +0000 |
parents | 076d533f840d |
children |
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/* * This module contains the messy code for automatic generation and * increment of concat SMS reference numbers. */ #include <sys/types.h> #include <sys/param.h> #include <sys/file.h> #include <sys/time.h> #include <ctype.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include "../../rvinterf/include/exitcodes.h" static int initial_seed() { struct timeval tv; u_char refno, *cp, *endp; gettimeofday(&tv, 0); cp = (u_char *) &tv; endp = cp + sizeof(struct timeval); refno = 0; while (cp < endp) refno ^= *cp++; return refno; } get_concsms_refno_from_host_fs() { char *homedir, statefile[MAXPATHLEN]; int fd, cc; char buf[6]; u_char refno; homedir = getenv("HOME"); if (!homedir) { fprintf(stderr, "error: no HOME= defined, needed for concat SMS refno\n"); exit(ERROR_UNIX); } sprintf(statefile, "%s/.concat_sms_refno", homedir); fd = open(statefile, O_RDWR|O_CREAT, 0666); if (fd < 0) { perror(statefile); exit(ERROR_UNIX); } cc = read(fd, buf, 5); if (cc == 5 && buf[0] == '0' && buf[1] == 'x' && isxdigit(buf[2]) && isxdigit(buf[3]) && buf[4] == '\n') refno = strtoul(buf, 0, 16) + 1; else refno = initial_seed(); sprintf(buf, "0x%02X\n", refno); lseek(fd, 0, SEEK_SET); write(fd, buf, 5); close(fd); return refno; }