/* * Chat -- a program for automatic session establishment (i.e. dial * the phone and log in). * * Standard termination codes: * 0 - successful completion of the script * 1 - invalid argument, expect string too large, etc. * 2 - error on an I/O operation or fatal error condition. * 3 - timeout waiting for a simple string. * 4 - the first string declared as "ABORT" * 5 - the second string declared as "ABORT" * 6 - ... and so on for successive ABORT strings. * * This software is in the public domain. * * ----------------- * added -T and -U option and \T and \U substitution to pass a phone * number into chat script. Two are needed for some ISDN TA applications. * Keith Dart * * * Added SAY keyword to send output to stderr. * This allows to turn ECHO OFF and to output specific, user selected, * text to give progress messages. This best works when stderr * exists (i.e.: pppd in nodetach mode). * * Added HANGUP directives to allow for us to be called * back. When HANGUP is set to NO, chat will not hangup at HUP signal. * We rely on timeouts in that case. * * Added CLR_ABORT to clear previously set ABORT string. This has been * dictated by the HANGUP above as "NO CARRIER" (for example) must be * an ABORT condition until we know the other host is going to close * the connection for call back. As soon as we have completed the * first stage of the call back sequence, "NO CARRIER" is a valid, non * fatal string. As soon as we got called back (probably get "CONNECT"), * we should re-arm the ABORT "NO CARRIER". Hence the CLR_ABORT command. * Note that CLR_ABORT packs the abort_strings[] array so that we do not * have unused entries not being reclaimed. * * In the same vein as above, added CLR_REPORT keyword. * * Allow for comments. Line starting with '#' are comments and are * ignored. If a '#' is to be expected as the first character, the * expect string must be quoted. * * * Francis Demierre * Thu May 15 17:15:40 MET DST 1997 * * * Added -r "report file" switch & REPORT keyword. * Robert Geer * * Added -s "use stderr" and -S "don't use syslog" switches. * June 18, 1997 * Karl O. Pinc * * * Added -e "echo" switch & ECHO keyword * Dick Streefland * * * Considerable updates and modifications by * Al Longyear * Paul Mackerras * * * The original author is: * * Karl Fox * Morning Star Technologies, Inc. * 1760 Zollinger Road * Columbus, OH 43221 * (614)451-1883 * * * $FreeBSD: src/usr.bin/chat/chat.c,v 1.21 2003/10/31 06:22:03 kientzle Exp $ */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define STR_LEN 1024 #ifndef SIGTYPE #define SIGTYPE void #endif #ifndef O_NONBLOCK #define O_NONBLOCK O_NDELAY #endif #define MAX_ABORTS 50 #define MAX_REPORTS 50 #define DEFAULT_CHAT_TIMEOUT 45 int echo = 0; int verbose = 0; int to_log = 1; int to_stderr = 0; int Verbose = 0; int quiet = 0; int exit_code = 0; FILE* report_fp = NULL; char *report_file = NULL; char *chat_file = NULL; char *phone_num = NULL; char *phone_num2 = NULL; int timeout = DEFAULT_CHAT_TIMEOUT; static char blank[] = ""; int have_tty_parameters = 0; #define term_parms struct termios #define get_term_param(param) tcgetattr(0, param) #define set_term_param(param) tcsetattr(0, TCSANOW, param) struct termios saved_tty_parameters; char *abort_string[MAX_ABORTS], *fail_reason = NULL, fail_buffer[50]; int n_aborts = 0, abort_next = 0, timeout_next = 0, echo_next = 0; int clear_abort_next = 0; char *report_string[MAX_REPORTS] ; char report_buffer[50] ; int n_reports = 0, report_next = 0, report_gathering = 0 ; int clear_report_next = 0; int say_next = 0, hup_next = 0; void *dup_mem(void *b, size_t c); void *copy_of(char *s); static void usage(void); void chat_logf(const char *fmt, ...); void fatal(int code, const char *fmt, ...); SIGTYPE sigalrm(int signo); SIGTYPE sigint(int signo); SIGTYPE sigterm(int signo); SIGTYPE sighup(int signo); void init(void); void set_tty_parameters(void); void echo_stderr(int); void break_sequence(void); void terminate(int status); void do_file(char *chatfile); int get_string(char *string); int put_string(char *s); int write_char(int c); int put_char(int c); int get_char(void); void chat_send(char *s); char *character(int c); void chat_expect(char *s); char *clean(char *s, int sending); void pack_array(char **array, int end); char *expect_strtok(char *, const char *); int vfmtmsg(char *, int, const char *, va_list); /* vsprintf++ */ void * dup_mem(void *b, size_t c) { void *ans = malloc (c); if (!ans) fatal(2, "memory error!"); memcpy (ans, b, c); return ans; } void * copy_of(char *s) { return dup_mem (s, strlen (s) + 1); } /* * chat [-esSvV] [-f chat-file] [-r report-file] [-t timeout] * [-T phone-number] [-U phone-number2] [chat-script] * where chat-script has the form: * [...[[expect[-send[-expect...]] send expect[-send[-expect]] ...]]] * * Perform a UUCP-dialer-like chat script on stdin and stdout. */ int main(int argc, char *argv[]) { int option; tzset(); while ((option = getopt(argc, argv, "ef:r:sSt:T:U:vV")) != -1) { switch (option) { case 'e': ++echo; break; case 'f': if (chat_file != NULL) free(chat_file); chat_file = copy_of(optarg); break; case 'r': if (report_fp != NULL) fclose(report_fp); if (report_file != NULL) free(report_file); report_file = copy_of(optarg); report_fp = fopen(report_file, "a"); if (report_fp != NULL) { if (verbose) fprintf(report_fp, "Opening \"%s\"...\n", report_file); } else fatal(2, "cannot open \"%s\" for appending", report_file); break; case 's': ++to_stderr; break; case 'S': to_log = 0; break; case 't': timeout = atoi(optarg); break; case 'T': if (phone_num != NULL) free(phone_num); phone_num = copy_of(optarg); break; case 'U': if (phone_num2 != NULL) free(phone_num2); phone_num2 = copy_of(optarg); break; case 'v': ++verbose; break; case 'V': ++Verbose; break; default: usage(); break; } } argc -= optind; argv += optind; /* * Default the report file to the stderr location */ if (report_fp == NULL) report_fp = stderr; if (to_log) { openlog("chat", LOG_PID | LOG_NDELAY, LOG_LOCAL2); if (verbose) setlogmask(LOG_UPTO(LOG_INFO)); else setlogmask(LOG_UPTO(LOG_WARNING)); } if (chat_file != NULL) { if (*argv != NULL) usage(); else { init(); do_file(chat_file); } } else { init(); while (*argv != NULL && argc > 0) { chat_expect(*argv); argv++; argc--; if (*argv != NULL && argc > 0) { chat_send(*argv); argv++; argc--; } } } terminate(0); return 0; } /* * Process a chat script when read from a file. */ void do_file(char *chatfile) { int linect, sendflg; char *sp, *arg, quote; char buf [STR_LEN]; FILE *cfp; cfp = fopen (chatfile, "r"); if (cfp == NULL) fatal(1, "%s -- open failed: %m", chatfile); linect = 0; sendflg = 0; while (fgets(buf, STR_LEN, cfp) != NULL) { sp = strchr (buf, '\n'); if (sp) *sp = '\0'; linect++; sp = buf; /* lines starting with '#' are comments. If a real '#' is to be expected, it should be quoted .... */ if ( *sp == '#' ) continue; while (*sp != '\0') { if (*sp == ' ' || *sp == '\t') { ++sp; continue; } if (*sp == '"' || *sp == '\'') { quote = *sp++; arg = sp; while (*sp != quote) { if (*sp == '\0') fatal(1, "unterminated quote (line %d)", linect); if (*sp++ == '\\') { if (*sp != '\0') ++sp; } } } else { arg = sp; while (*sp != '\0' && *sp != ' ' && *sp != '\t') ++sp; } if (*sp != '\0') *sp++ = '\0'; if (sendflg) chat_send (arg); else chat_expect (arg); sendflg = !sendflg; } } fclose (cfp); } /* * We got an error parsing the command line. */ static void usage(void) { fprintf(stderr, "Usage: chat [-esSvV] [-f chat-file] [-r report-file] [-t timeout]\n" " [-T phone-number] [-U phone-number2] [chat-script]\n" "where chat-script has the form:\n" " [...[[expect[-send[-expect...]] send expect[-send[-expect]] ...]]]\n"); exit(1); } char line[1024]; /* * Send a message to syslog and/or stderr. */ void chat_logf(const char *fmt, ...) { va_list args; va_start(args, fmt); vfmtmsg(line, sizeof(line), fmt, args); if (to_log) syslog(LOG_INFO, "%s", line); if (to_stderr) fprintf(stderr, "%s\n", line); } /* * Print an error message and terminate. */ void fatal(int code, const char *fmt, ...) { va_list args; va_start(args, fmt); vfmtmsg(line, sizeof(line), fmt, args); if (to_log) syslog(LOG_ERR, "%s", line); if (to_stderr) fprintf(stderr, "%s\n", line); terminate(code); } int alarmed = 0; SIGTYPE sigalrm(int signo __unused) { int flags; alarm(1); alarmed = 1; /* Reset alarm to avoid race window */ signal(SIGALRM, sigalrm); /* that can cause hanging in read() */ if ((flags = fcntl(0, F_GETFL, 0)) == -1) fatal(2, "Can't get file mode flags on stdin: %m"); if (fcntl(0, F_SETFL, flags | O_NONBLOCK) == -1) fatal(2, "Can't set file mode flags on stdin: %m"); if (verbose) chat_logf("alarm"); } SIGTYPE sigint(int signo __unused) { fatal(2, "SIGINT"); } SIGTYPE sigterm(int signo __unused) { fatal(2, "SIGTERM"); } SIGTYPE sighup(int signo __unused) { fatal(2, "SIGHUP"); } void init(void) { signal(SIGINT, sigint); signal(SIGTERM, sigterm); signal(SIGHUP, sighup); set_tty_parameters(); signal(SIGALRM, sigalrm); alarm(0); alarmed = 0; } void set_tty_parameters(void) { #if defined(get_term_param) term_parms t; if (get_term_param (&t) < 0) fatal(2, "Can't get terminal parameters: %m"); saved_tty_parameters = t; have_tty_parameters = 1; t.c_iflag |= IGNBRK | ISTRIP | IGNPAR; t.c_oflag = 0; t.c_lflag = 0; t.c_cc[VERASE] = t.c_cc[VKILL] = 0; t.c_cc[VMIN] = 1; t.c_cc[VTIME] = 0; if (set_term_param (&t) < 0) fatal(2, "Can't set terminal parameters: %m"); #endif } void break_sequence(void) { tcsendbreak (0, 0); } void terminate(int status) { echo_stderr(-1); if (report_file != NULL && report_fp != NULL) { /* * Allow the last of the report string to be gathered before we terminate. */ if (report_gathering) { int c; size_t rep_len; rep_len = strlen(report_buffer); while (rep_len + 1 <= sizeof(report_buffer)) { alarm(1); c = get_char(); alarm(0); if (c < 0 || iscntrl(c)) break; report_buffer[rep_len] = c; ++rep_len; } report_buffer[rep_len] = 0; fprintf (report_fp, "chat: %s\n", report_buffer); } if (verbose) fprintf (report_fp, "Closing \"%s\".\n", report_file); fclose (report_fp); report_fp = NULL; } #if defined(get_term_param) if (have_tty_parameters) { if (set_term_param (&saved_tty_parameters) < 0) fatal(2, "Can't restore terminal parameters: %m"); } #endif exit(status); } /* * 'Clean up' this string. */ char * clean(char *s, int sending) { char temp[STR_LEN], cur_chr; char *s1, *phchar; int add_return = sending; #define isoctal(chr) (((chr) >= '0') && ((chr) <= '7')) s1 = temp; /* Don't overflow buffer, leave room for chars we append later */ while (*s && s1 - temp < (off_t)(sizeof(temp) - 2 - add_return)) { cur_chr = *s++; if (cur_chr == '^') { cur_chr = *s++; if (cur_chr == '\0') { *s1++ = '^'; break; } cur_chr &= 0x1F; if (cur_chr != 0) { *s1++ = cur_chr; } continue; } if (cur_chr != '\\') { *s1++ = cur_chr; continue; } cur_chr = *s++; if (cur_chr == '\0') { if (sending) { *s1++ = '\\'; *s1++ = '\\'; } break; } switch (cur_chr) { case 'b': *s1++ = '\b'; break; case 'c': if (sending && *s == '\0') add_return = 0; else *s1++ = cur_chr; break; case '\\': case 'K': case 'p': case 'd': if (sending) *s1++ = '\\'; *s1++ = cur_chr; break; case 'T': if (sending && phone_num) { for ( phchar = phone_num; *phchar != '\0'; phchar++) *s1++ = *phchar; } else { *s1++ = '\\'; *s1++ = 'T'; } break; case 'U': if (sending && phone_num2) { for ( phchar = phone_num2; *phchar != '\0'; phchar++) *s1++ = *phchar; } else { *s1++ = '\\'; *s1++ = 'U'; } break; case 'q': quiet = 1; break; case 'r': *s1++ = '\r'; break; case 'n': *s1++ = '\n'; break; case 's': *s1++ = ' '; break; case 't': *s1++ = '\t'; break; case 'N': if (sending) { *s1++ = '\\'; *s1++ = '\0'; } else *s1++ = 'N'; break; default: if (isoctal (cur_chr)) { cur_chr &= 0x07; if (isoctal (*s)) { cur_chr <<= 3; cur_chr |= *s++ - '0'; if (isoctal (*s)) { cur_chr <<= 3; cur_chr |= *s++ - '0'; } } if (cur_chr != 0 || sending) { if (sending && (cur_chr == '\\' || cur_chr == 0)) *s1++ = '\\'; *s1++ = cur_chr; } break; } if (sending) *s1++ = '\\'; *s1++ = cur_chr; break; } } if (add_return) *s1++ = '\r'; *s1++ = '\0'; /* guarantee closure */ *s1++ = '\0'; /* terminate the string */ return dup_mem (temp, (size_t) (s1 - temp)); /* may have embedded nuls */ } /* * A modified version of 'strtok'. This version skips \ sequences. */ char * expect_strtok (char *s, const char *term) { static char *str = blank; int escape_flag = 0; char *result; /* * If a string was specified then do initial processing. */ if (s) str = s; /* * If this is the escape flag then reset it and ignore the character. */ if (*str) result = str; else result = NULL; while (*str) { if (escape_flag) { escape_flag = 0; ++str; continue; } if (*str == '\\') { ++str; escape_flag = 1; continue; } /* * If this is not in the termination string, continue. */ if (strchr (term, *str) == NULL) { ++str; continue; } /* * This is the terminator. Mark the end of the string and stop. */ *str++ = '\0'; break; } return (result); } /* * Process the expect string */ void chat_expect(char *s) { char *expect; char *reply; if (strcmp(s, "HANGUP") == 0) { ++hup_next; return; } if (strcmp(s, "ABORT") == 0) { ++abort_next; return; } if (strcmp(s, "CLR_ABORT") == 0) { ++clear_abort_next; return; } if (strcmp(s, "REPORT") == 0) { ++report_next; return; } if (strcmp(s, "CLR_REPORT") == 0) { ++clear_report_next; return; } if (strcmp(s, "TIMEOUT") == 0) { ++timeout_next; return; } if (strcmp(s, "ECHO") == 0) { ++echo_next; return; } if (strcmp(s, "SAY") == 0) { ++say_next; return; } /* * Fetch the expect and reply string. */ for (;;) { expect = expect_strtok (s, "-"); s = NULL; if (expect == NULL) return; reply = expect_strtok (s, "-"); /* * Handle the expect string. If successful then exit. */ if (get_string (expect)) return; /* * If there is a sub-reply string then send it. Otherwise any condition * is terminal. */ if (reply == NULL || exit_code != 3) break; chat_send (reply); } /* * The expectation did not occur. This is terminal. */ if (fail_reason) chat_logf("Failed (%s)", fail_reason); else chat_logf("Failed"); terminate(exit_code); } /* * Translate the input character to the appropriate string for printing * the data. */ char * character(int c) { static char string[10]; const char *meta; meta = (c & 0x80) ? "M-" : ""; c &= 0x7F; if (c < 32) sprintf(string, "%s^%c", meta, (int)c + '@'); else if (c == 127) sprintf(string, "%s^?", meta); else sprintf(string, "%s%c", meta, c); return (string); } /* * process the reply string */ void chat_send(char *s) { if (say_next) { say_next = 0; s = clean(s,0); write(STDERR_FILENO, s, strlen(s)); free(s); return; } if (hup_next) { hup_next = 0; if (strcmp(s, "OFF") == 0) signal(SIGHUP, SIG_IGN); else signal(SIGHUP, sighup); return; } if (echo_next) { echo_next = 0; echo = (strcmp(s, "ON") == 0); return; } if (abort_next) { char *s1; abort_next = 0; if (n_aborts >= MAX_ABORTS) fatal(2, "Too many ABORT strings"); s1 = clean(s, 0); if (strlen(s1) > strlen(s) || strlen(s1) + 1 > sizeof(fail_buffer)) fatal(1, "Illegal or too-long ABORT string ('%v')", s); abort_string[n_aborts++] = s1; if (verbose) chat_logf("abort on (%v)", s); return; } if (clear_abort_next) { char *s1; int i; int old_max; int pack = 0; clear_abort_next = 0; s1 = clean(s, 0); if (strlen(s1) > strlen(s) || strlen(s1) + 1 > sizeof(fail_buffer)) fatal(1, "Illegal or too-long CLR_ABORT string ('%v')", s); old_max = n_aborts; for (i=0; i < n_aborts; i++) { if ( strcmp(s1,abort_string[i]) == 0 ) { free(abort_string[i]); abort_string[i] = NULL; pack++; n_aborts--; if (verbose) chat_logf("clear abort on (%v)", s); } } free(s1); if (pack) pack_array(abort_string,old_max); return; } if (report_next) { char *s1; report_next = 0; if (n_reports >= MAX_REPORTS) fatal(2, "Too many REPORT strings"); s1 = clean(s, 0); if (strlen(s1) > strlen(s) || strlen(s1) > sizeof fail_buffer - 1) fatal(1, "Illegal or too-long REPORT string ('%v')", s); report_string[n_reports++] = s1; if (verbose) chat_logf("report (%v)", s); return; } if (clear_report_next) { char *s1; int i; int old_max; int pack = 0; clear_report_next = 0; s1 = clean(s, 0); if (strlen(s1) > strlen(s) || strlen(s1) > sizeof fail_buffer - 1) fatal(1, "Illegal or too-long REPORT string ('%v')", s); old_max = n_reports; for (i=0; i < n_reports; i++) { if ( strcmp(s1,report_string[i]) == 0 ) { free(report_string[i]); report_string[i] = NULL; pack++; n_reports--; if (verbose) chat_logf("clear report (%v)", s); } } free(s1); if (pack) pack_array(report_string,old_max); return; } if (timeout_next) { timeout_next = 0; timeout = atoi(s); if (timeout <= 0) timeout = DEFAULT_CHAT_TIMEOUT; if (verbose) chat_logf("timeout set to %d seconds", timeout); return; } if (strcmp(s, "EOT") == 0) s = strdup("^D\\c"); else if (strcmp(s, "BREAK") == 0) s = strdup("\\K\\c"); if (!put_string(s)) fatal(1, "Failed"); } int get_char(void) { int status; char c; status = read(STDIN_FILENO, &c, 1); switch (status) { case 1: return ((int)c & 0x7F); default: chat_logf("warning: read() on stdin returned %d", status); case -1: if ((status = fcntl(0, F_GETFL, 0)) == -1) fatal(2, "Can't get file mode flags on stdin: %m"); if (fcntl(0, F_SETFL, status & ~O_NONBLOCK) == -1) fatal(2, "Can't set file mode flags on stdin: %m"); return (-1); } } int put_char(int c) { int status; char ch = c; usleep(10000); /* inter-character typing delay (?) */ status = write(STDOUT_FILENO, &ch, 1); switch (status) { case 1: return (0); default: chat_logf("warning: write() on stdout returned %d", status); case -1: if ((status = fcntl(0, F_GETFL, 0)) == -1) fatal(2, "Can't get file mode flags on stdin, %m"); if (fcntl(0, F_SETFL, status & ~O_NONBLOCK) == -1) fatal(2, "Can't set file mode flags on stdin: %m"); return (-1); } } int write_char(int c) { if (alarmed || put_char(c) < 0) { alarm(0); alarmed = 0; if (verbose) { if (errno == EINTR || errno == EWOULDBLOCK) chat_logf(" -- write timed out"); else chat_logf(" -- write failed: %m"); } return (0); } return (1); } int put_string(char *s) { quiet = 0; s = clean(s, 1); if (verbose) chat_logf("send (%v)", quiet ? "??????" : s); alarm(timeout); alarmed = 0; while (*s) { char c = *s++; if (c != '\\') { if (!write_char (c)) return 0; continue; } c = *s++; switch (c) { case 'd': sleep(1); break; case 'K': break_sequence(); break; case 'p': usleep(10000); /* 1/100th of a second (arg is microseconds) */ break; default: if (!write_char (c)) return 0; break; } } alarm(0); alarmed = 0; return (1); } /* * Echo a character to stderr. * When called with -1, a '\n' character is generated when * the cursor is not at the beginning of a line. */ void echo_stderr(int n) { static int need_lf; char *s; switch (n) { case '\r': /* ignore '\r' */ break; case -1: if (need_lf == 0) break; /* FALLTHROUGH */ case '\n': write(STDERR_FILENO, "\n", 1); need_lf = 0; break; default: s = character(n); write(STDERR_FILENO, s, strlen(s)); need_lf = 1; break; } } /* * 'Wait for' this string to appear on this file descriptor. */ int get_string(char *string) { char temp[STR_LEN]; int c, printed = 0; size_t len, minlen; char *s = temp, *end = s + STR_LEN; char *logged = temp; fail_reason = NULL; if (strlen(string) > STR_LEN) { chat_logf("expect string is too long"); exit_code = 1; return 0; } string = clean(string, 0); len = strlen(string); minlen = (len > sizeof(fail_buffer)? len: sizeof(fail_buffer)) - 1; if (verbose) chat_logf("expect (%v)", string); if (len == 0) { if (verbose) chat_logf("got it"); return (1); } alarm(timeout); alarmed = 0; while ( ! alarmed && (c = get_char()) >= 0) { int n, abort_len, report_len; if (echo) echo_stderr(c); if (verbose && c == '\n') { if (s == logged) chat_logf(""); /* blank line */ else chat_logf("%0.*v", s - logged, logged); logged = s + 1; } *s++ = c; if (verbose && s >= logged + 80) { chat_logf("%0.*v", s - logged, logged); logged = s; } if (Verbose) { if (c == '\n') fputc( '\n', stderr ); else if (c != '\r') fprintf( stderr, "%s", character(c) ); } if (!report_gathering) { for (n = 0; n < n_reports; ++n) { if ((report_string[n] != NULL) && s - temp >= (report_len = strlen(report_string[n])) && strncmp(s - report_len, report_string[n], report_len) == 0) { time_t time_now = time (NULL); struct tm* tm_now = localtime (&time_now); strftime (report_buffer, 20, "%b %d %H:%M:%S ", tm_now); strcat (report_buffer, report_string[n]); report_string[n] = NULL; report_gathering = 1; break; } } } else { if (!iscntrl (c)) { int rep_len = strlen (report_buffer); report_buffer[rep_len] = c; report_buffer[rep_len + 1] = '\0'; } else { report_gathering = 0; fprintf (report_fp, "chat: %s\n", report_buffer); } } if ((size_t)(s - temp) >= len && c == string[len - 1] && strncmp(s - len, string, len) == 0) { if (verbose) { if (s > logged) chat_logf("%0.*v", s - logged, logged); chat_logf(" -- got it\n"); } alarm(0); alarmed = 0; return (1); } for (n = 0; n < n_aborts; ++n) { if (s - temp >= (abort_len = strlen(abort_string[n])) && strncmp(s - abort_len, abort_string[n], abort_len) == 0) { if (verbose) { if (s > logged) chat_logf("%0.*v", s - logged, logged); chat_logf(" -- failed"); } alarm(0); alarmed = 0; exit_code = n + 4; strcpy(fail_reason = fail_buffer, abort_string[n]); return (0); } } if (s >= end) { if (logged < s - minlen) { chat_logf("%0.*v", s - logged, logged); logged = s; } s -= minlen; memmove(temp, s, minlen); logged = temp + (logged - s); s = temp + minlen; } if (alarmed && verbose) chat_logf("warning: alarm synchronization problem"); } alarm(0); if (verbose && printed) { if (alarmed) chat_logf(" -- read timed out"); else chat_logf(" -- read failed: %m"); } exit_code = 3; alarmed = 0; return (0); } void pack_array(char **array, int end) { int i, j; for (i = 0; i < end; i++) { if (array[i] == NULL) { for (j = i+1; j < end; ++j) if (array[j] != NULL) array[i++] = array[j]; for (; i < end; ++i) array[i] = NULL; break; } } } /* * vfmtmsg - format a message into a buffer. Like vsprintf except we * also specify the length of the output buffer, and we handle the * %m (error message) format. * Doesn't do floating-point formats. * Returns the number of chars put into buf. */ #define OUTCHAR(c) (buflen > 0? (--buflen, *buf++ = (c)): 0) int vfmtmsg(char *buf, int buflen, const char *fmt, va_list args) { int c, i, n; int width, prec, fillch; int base, len, neg, quoted; unsigned long val = 0; char *str, *buf0; const char *f; unsigned char *p; char num[32]; static char hexchars[] = "0123456789abcdef"; buf0 = buf; --buflen; while (buflen > 0) { for (f = fmt; *f != '%' && *f != 0; ++f) ; if (f > fmt) { len = f - fmt; if (len > buflen) len = buflen; memcpy(buf, fmt, len); buf += len; buflen -= len; fmt = f; } if (*fmt == 0) break; c = *++fmt; width = prec = 0; fillch = ' '; if (c == '0') { fillch = '0'; c = *++fmt; } if (c == '*') { width = va_arg(args, int); c = *++fmt; } else { while (isdigit(c)) { width = width * 10 + c - '0'; c = *++fmt; } } if (c == '.') { c = *++fmt; if (c == '*') { prec = va_arg(args, int); c = *++fmt; } else { while (isdigit(c)) { prec = prec * 10 + c - '0'; c = *++fmt; } } } str = NULL; base = 0; neg = 0; ++fmt; switch (c) { case 'd': i = va_arg(args, int); if (i < 0) { neg = 1; val = -i; } else val = i; base = 10; break; case 'o': val = va_arg(args, unsigned int); base = 8; break; case 'x': val = va_arg(args, unsigned int); base = 16; break; case 'p': val = (unsigned long) va_arg(args, void *); base = 16; neg = 2; break; case 's': str = va_arg(args, char *); break; case 'c': num[0] = va_arg(args, int); num[1] = 0; str = num; break; case 'm': str = strerror(errno); break; case 'v': /* "visible" string */ case 'q': /* quoted string */ quoted = c == 'q'; p = va_arg(args, unsigned char *); if (fillch == '0' && prec > 0) { n = prec; } else { n = strlen((char *)p); if (prec > 0 && prec < n) n = prec; } while (n > 0 && buflen > 0) { c = *p++; --n; if (!quoted && c >= 0x80) { OUTCHAR('M'); OUTCHAR('-'); c -= 0x80; } if (quoted && (c == '"' || c == '\\')) OUTCHAR('\\'); if (c < 0x20 || (0x7f <= c && c < 0xa0)) { if (quoted) { OUTCHAR('\\'); switch (c) { case '\t': OUTCHAR('t'); break; case '\n': OUTCHAR('n'); break; case '\b': OUTCHAR('b'); break; case '\f': OUTCHAR('f'); break; default: OUTCHAR('x'); OUTCHAR(hexchars[c >> 4]); OUTCHAR(hexchars[c & 0xf]); } } else { if (c == '\t') OUTCHAR(c); else { OUTCHAR('^'); OUTCHAR(c ^ 0x40); } } } else OUTCHAR(c); } continue; default: *buf++ = '%'; if (c != '%') --fmt; /* so %z outputs %z etc. */ --buflen; continue; } if (base != 0) { str = num + sizeof(num); *--str = 0; while (str > num + neg) { *--str = hexchars[val % base]; val = val / base; if (--prec <= 0 && val == 0) break; } switch (neg) { case 1: *--str = '-'; break; case 2: *--str = 'x'; *--str = '0'; break; } len = num + sizeof(num) - 1 - str; } else { len = strlen(str); if (prec > 0 && len > prec) len = prec; } if (width > 0) { if (width > buflen) width = buflen; if ((n = width - len) > 0) { buflen -= n; for (; n > 0; --n) *buf++ = fillch; } } if (len > buflen) len = buflen; memcpy(buf, str, len); buf += len; buflen -= len; } *buf = 0; return buf - buf0; }