FreeCalypso > hg > freecalypso-tools
view uptools/atcmd/smsend_concat.c @ 416:30f6d1c32c6f
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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/* * 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; }