chat/chat.c

   1 /*
   2  *      Chat -- a program for automatic session establishment (i.e. dial
   3  *              the phone and log in).
   4  *
   5  * Standard termination codes:
   6  *  0 - successful completion of the script
   7  *  1 - invalid argument, expect string too large, etc.
   8  *  2 - error on an I/O operation or fatal error condition.
   9  *  3 - timeout waiting for a simple string.
  10  *  4 - the first string declared as "ABORT"
  11  *  5 - the second string declared as "ABORT"
  12  *  6 - ... and so on for successive ABORT strings.
  13  *
  14  *      This software is in the public domain.
  15  *
  16  * -----------------
  17  *      22-May-99 added environment substitutuion, enabled with -E switch.
  18  *      Andreas Arens <andras@cityweb.de>.
  19  *
  20  *      12-May-99 added a feature to read data to be sent from a file,
  21  *      if the send string starts with @.  Idea from gpk <gpk@onramp.net>.
  22  *
  23  *      added -T and -U option and \T and \U substitution to pass a phone
  24  *      number into chat script. Two are needed for some ISDN TA applications.
  25  *      Keith Dart <kdart@cisco.com>
  26  *
  27  *
  28  *      Added SAY keyword to send output to stderr.
  29  *      This allows to turn ECHO OFF and to output specific, user selected,
  30  *      text to give progress messages. This best works when stderr
  31  *      exists (i.e.: pppd in nodetach mode).
  32  *
  33  *      Added HANGUP directives to allow for us to be called
  34  *      back. When HANGUP is set to NO, chat will not hangup at HUP signal.
  35  *      We rely on timeouts in that case.
  36  *
  37  *      Added CLR_ABORT to clear previously set ABORT string. This has been
  38  *      dictated by the HANGUP above as "NO CARRIER" (for example) must be
  39  *      an ABORT condition until we know the other host is going to close
  40  *      the connection for call back. As soon as we have completed the
  41  *      first stage of the call back sequence, "NO CARRIER" is a valid, non
  42  *      fatal string. As soon as we got called back (probably get "CONNECT"),
  43  *      we should re-arm the ABORT "NO CARRIER". Hence the CLR_ABORT command.
  44  *      Note that CLR_ABORT packs the abort_strings[] array so that we do not
  45  *      have unused entries not being reclaimed.
  46  *
  47  *      In the same vein as above, added CLR_REPORT keyword.
  48  *
  49  *      Allow for comments. Line starting with '#' are comments and are
  50  *      ignored. If a '#' is to be expected as the first character, the
  51  *      expect string must be quoted.
  52  *
  53  *
  54  *              Francis Demierre <Francis@SwissMail.Com>
  55  *              Thu May 15 17:15:40 MET DST 1997
  56  *
  57  *
  58  *      Added -r "report file" switch & REPORT keyword.
  59  *              Robert Geer <bgeer@xmission.com>
  60  *
  61  *      Added -s "use stderr" and -S "don't use syslog" switches.
  62  *              June 18, 1997
  63  *              Karl O. Pinc <kop@meme.com>
  64  *
  65  *
  66  *      Added -e "echo" switch & ECHO keyword
  67  *              Dick Streefland <dicks@tasking.nl>
  68  *
  69  *
  70  *      Considerable updates and modifications by
  71  *              Al Longyear <longyear@pobox.com>
  72  *              Paul Mackerras <paulus@cs.anu.edu.au>
  73  *
  74  *
  75  *      The original author is:
  76  *
  77  *              Karl Fox <karl@MorningStar.Com>
  78  *              Morning Star Technologies, Inc.
  79  *              1760 Zollinger Road
  80  *              Columbus, OH  43221
  81  *              (614)451-1883
  82  *
  83  */
  84
  85 #ifndef __STDC__
  86 #define const
  87 #endif
  88
  89 #ifndef lint
  90 static const char rcsid[] = "$Id: chat.c,v 1.30 2004/01/17 05:47:55 carlsonj Exp $";
  91 #endif
  92
  93 #include <stdio.h>
  94 #include <ctype.h>
  95 #include <time.h>
  96 #include <fcntl.h>
  97 #include <signal.h>
  98 #include <errno.h>
  99 #include <string.h>
 100 #include <stdlib.h>
 101 #include <unistd.h>
 102 #include <sys/types.h>
 103 #include <sys/stat.h>
 104 #include <syslog.h>
 105
 106 #ifndef TERMIO
 107 #undef  TERMIOS
 108 #define TERMIOS
 109 #endif
 110
 111 #ifdef TERMIO
 112 #include <termio.h>
 113 #endif
 114 #ifdef TERMIOS
 115 #include <termios.h>
 116 #endif
 117
 118 #define STR_LEN 1024
 119
 120 #ifndef SIGTYPE
 121 #define SIGTYPE void
 122 #endif
 123
 124 #undef __P
 125 #undef __V
 126
 127 #ifdef __STDC__
 128 #include <stdarg.h>
 129 #define __V(x)  x
 130 #define __P(x)  x
 131 #else
 132 #include <varargs.h>
 133 #define __V(x)  (va_alist) va_dcl
 134 #define __P(x)  ()
 135 #define const
 136 #endif
 137
 138 #ifndef O_NONBLOCK
 139 #define O_NONBLOCK      O_NDELAY
 140 #endif
 141
 142 #ifdef SUNOS
 143 extern int sys_nerr;
 144 extern char *sys_errlist[];
 145 #define memmove(to, from, n)    bcopy(from, to, n)
 146 #define strerror(n)             ((unsigned)(n) < sys_nerr? sys_errlist[(n)] :\
 147                                  "unknown error")
 148 #endif
 149
 150 /*************** Micro getopt() *********************************************/
 151 #define OPTION(c,v)     (_O&2&&**v?*(*v)++:!c||_O&4?0:(!(_O&1)&& \
 152                                 (--c,++v),_O=4,c&&**v=='-'&&v[0][1]?*++*v=='-'\
 153                                 &&!v[0][1]?(--c,++v,0):(_O=2,*(*v)++):0))
 154 #define OPTARG(c,v)     (_O&2?**v||(++v,--c)?(_O=1,--c,*v++): \
 155                                 (_O=4,(char*)0):(char*)0)
 156 #define OPTONLYARG(c,v) (_O&2&&**v?(_O=1,--c,*v++):(char*)0)
 157 #define ARG(c,v)        (c?(--c,*v++):(char*)0)
 158
 159 static int _O = 0;              /* Internal state */
 160 /*************** Micro getopt() *********************************************/
 161
 162 char *program_name;
 163
 164 #define MAX_ABORTS              50
 165 #define MAX_REPORTS             50
 166 #define DEFAULT_CHAT_TIMEOUT    45
 167
 168 int echo          = 0;
 169 int verbose       = 0;
 170 int to_log        = 1;
 171 int to_stderr     = 0;
 172 int Verbose       = 0;
 173 int quiet         = 0;
 174 int report        = 0;
 175 int use_env       = 0;
 176 int exit_code     = 0;
 177 FILE* report_fp   = (FILE *) 0;
 178 char *report_file = (char *) 0;
 179 char *chat_file   = (char *) 0;
 180 char *phone_num   = (char *) 0;
 181 char *phone_num2  = (char *) 0;
 182 int timeout       = DEFAULT_CHAT_TIMEOUT;
 183
 184 int have_tty_parameters = 0;
 185
 186 #ifdef TERMIO
 187 #define term_parms struct termio
 188 #define get_term_param(param) ioctl(0, TCGETA, param)
 189 #define set_term_param(param) ioctl(0, TCSETA, param)
 190 struct termio saved_tty_parameters;
 191 #endif
 192
 193 #ifdef TERMIOS
 194 #define term_parms struct termios
 195 #define get_term_param(param) tcgetattr(0, param)
 196 #define set_term_param(param) tcsetattr(0, TCSANOW, param)
 197 struct termios saved_tty_parameters;
 198 #endif
 199
 200 char *abort_string[MAX_ABORTS], *fail_reason = (char *)0,
 201         fail_buffer[50];
 202 int n_aborts = 0, abort_next = 0, timeout_next = 0, echo_next = 0;
 203 int clear_abort_next = 0;
 204
 205 char *report_string[MAX_REPORTS] ;
 206 char  report_buffer[256] ;
 207 int n_reports = 0, report_next = 0, report_gathering = 0 ;
 208 int clear_report_next = 0;
 209
 210 int say_next = 0, hup_next = 0;
 211
 212 void *dup_mem __P((void *b, size_t c));
 213 void *copy_of __P((char *s));
 214 char *grow __P((char *s, char **p, size_t len));
 215 void usage __P((void));
 216 void msgf __P((const char *fmt, ...));
 217 void fatal __P((int code, const char *fmt, ...));
 218 SIGTYPE sigalrm __P((int signo));
 219 SIGTYPE sigint __P((int signo));
 220 SIGTYPE sigterm __P((int signo));
 221 SIGTYPE sighup __P((int signo));
 222 void unalarm __P((void));
 223 void init __P((void));
 224 void set_tty_parameters __P((void));
 225 void echo_stderr __P((int));
 226 void break_sequence __P((void));
 227 void terminate __P((int status));
 228 void do_file __P((char *chat_file));
 229 int  get_string __P((register char *string));
 230 int  put_string __P((register char *s));
 231 int  write_char __P((int c));
 232 int  put_char __P((int c));
 233 int  get_char __P((void));
 234 void chat_send __P((register char *s));
 235 char *character __P((int c));
 236 void chat_expect __P((register char *s));
 237 char *clean __P((register char *s, int sending));
 238 void break_sequence __P((void));
 239 void terminate __P((int status));
 240 void pack_array __P((char **array, int end));
 241 char *expect_strtok __P((char *, char *));
 242 int vfmtmsg __P((char *, int, const char *, va_list));  /* vsprintf++ */
 243
 244 int main __P((int, char *[]));
 245
 246 void *dup_mem(b, c)
 247 void *b;
 248 size_t c;
 249 {
 250     void *ans = malloc (c);
 251     if (!ans)
 252         fatal(2, "memory error!");
 253
 254     memcpy (ans, b, c);
 255     return ans;
 256 }
 257
 258 void *copy_of (s)
 259 char *s;
 260 {
 261     return dup_mem (s, strlen (s) + 1);
 262 }
 263
 264 /* grow a char buffer and keep a pointer offset */
 265 char *grow(s, p, len)
 266 char *s;
 267 char **p;
 268 size_t len;
 269 {
 270     size_t l = *p - s;          /* save p as distance into s */
 271
 272     s = realloc(s, len);
 273     if (!s)
 274         fatal(2, "memory error!");
 275     *p = s + l;                 /* restore p */
 276     return s;
 277 }
 278
 279 /*
 280  * chat [ -v ] [ -E ] [ -T number ] [ -U number ] [ -t timeout ] [ -f chat-file ] \
 281  * [ -r report-file ] \
 282  *              [...[[expect[-say[-expect...]] say expect[-say[-expect]] ...]]]
 283  *
 284  *      Perform a UUCP-dialer-like chat script on stdin and stdout.
 285  */
 286 int
 287 main(argc, argv)
 288      int argc;
 289      char **argv;
 290 {
 291     int option;
 292     char *arg;
 293
 294     program_name = *argv;
 295     tzset();
 296
 297     while ((option = OPTION(argc, argv)) != 0) {
 298         switch (option) {
 299         case 'e':
 300             ++echo;
 301             break;
 302
 303         case 'E':
 304             ++use_env;
 305             break;
 306
 307         case 'v':
 308             ++verbose;
 309             break;
 310
 311         case 'V':
 312             ++Verbose;
 313             break;
 314
 315         case 's':
 316             ++to_stderr;
 317             break;
 318
 319         case 'S':
 320             to_log = 0;
 321             break;
 322
 323         case 'f':
 324             if ((arg = OPTARG(argc, argv)) != NULL)
 325                     chat_file = copy_of(arg);
 326             else
 327                 usage();
 328             break;
 329
 330         case 't':
 331             if ((arg = OPTARG(argc, argv)) != NULL)
 332                 timeout = atoi(arg);
 333             else
 334                 usage();
 335             break;
 336
 337         case 'r':
 338             arg = OPTARG (argc, argv);
 339             if (arg) {
 340                 if (report_fp != NULL)
 341                     fclose (report_fp);
 342                 report_file = copy_of (arg);
 343                 report_fp   = fopen (report_file, "a");
 344                 if (report_fp != NULL) {
 345                     if (verbose)
 346                         fprintf (report_fp, "Opening \"%s\"...\n",
 347                                  report_file);
 348                     report = 1;
 349                 }
 350             }
 351             break;
 352
 353         case 'T':
 354             if ((arg = OPTARG(argc, argv)) != NULL)
 355                 phone_num = copy_of(arg);
 356             else
 357                 usage();
 358             break;
 359
 360         case 'U':
 361             if ((arg = OPTARG(argc, argv)) != NULL)
 362                 phone_num2 = copy_of(arg);
 363             else
 364                 usage();
 365             break;
 366
 367         default:
 368             usage();
 369             break;
 370         }
 371     }
 372 /*
 373  * Default the report file to the stderr location
 374  */
 375     if (report_fp == NULL)
 376         report_fp = stderr;
 377
 378     if (to_log) {
 379 #ifdef ultrix
 380         openlog("chat", LOG_PID);
 381 #else
 382         openlog("chat", LOG_PID | LOG_NDELAY, LOG_LOCAL2);
 383
 384         if (verbose)
 385             setlogmask(LOG_UPTO(LOG_INFO));
 386         else
 387             setlogmask(LOG_UPTO(LOG_WARNING));
 388 #endif
 389     }
 390
 391     init();
 392
 393     if (chat_file != NULL) {
 394         arg = ARG(argc, argv);
 395         if (arg != NULL)
 396             usage();
 397         else
 398             do_file (chat_file);
 399     } else {
 400         while ((arg = ARG(argc, argv)) != NULL) {
 401             chat_expect(arg);
 402
 403             if ((arg = ARG(argc, argv)) != NULL)
 404                 chat_send(arg);
 405         }
 406     }
 407
 408     terminate(0);
 409     return 0;
 410 }
 411
 412 /*
 413  *  Process a chat script when read from a file.
 414  */
 415
 416 void do_file (chat_file)
 417 char *chat_file;
 418 {
 419     int linect, sendflg;
 420     char *sp, *arg, quote;
 421     char buf [STR_LEN];
 422     FILE *cfp;
 423
 424     cfp = fopen (chat_file, "r");
 425     if (cfp == NULL)
 426         fatal(1, "%s -- open failed: %m", chat_file);
 427
 428     linect = 0;
 429     sendflg = 0;
 430
 431     while (fgets(buf, STR_LEN, cfp) != NULL) {
 432         sp = strchr (buf, '\n');
 433         if (sp)
 434             *sp = '\0';
 435
 436         linect++;
 437         sp = buf;
 438
 439         /* lines starting with '#' are comments. If a real '#'
 440            is to be expected, it should be quoted .... */
 441         if ( *sp == '#' )
 442             continue;
 443
 444         while (*sp != '\0') {
 445             if (*sp == ' ' || *sp == '\t') {
 446                 ++sp;
 447                 continue;
 448             }
 449
 450             if (*sp == '"' || *sp == '\'') {
 451                 quote = *sp++;
 452                 arg = sp;
 453                 while (*sp != quote) {
 454                     if (*sp == '\0')
 455                         fatal(1, "unterminated quote (line %d)", linect);
 456
 457                     if (*sp++ == '\\') {
 458                         if (*sp != '\0')
 459                             ++sp;
 460                     }
 461                 }
 462             }
 463             else {
 464                 arg = sp;
 465                 while (*sp != '\0' && *sp != ' ' && *sp != '\t')
 466                     ++sp;
 467             }
 468
 469             if (*sp != '\0')
 470                 *sp++ = '\0';
 471
 472             if (sendflg)
 473                 chat_send (arg);
 474             else
 475                 chat_expect (arg);
 476             sendflg = !sendflg;
 477         }
 478     }
 479     fclose (cfp);
 480 }
 481
 482 /*
 483  *      We got an error parsing the command line.
 484  */
 485 void usage()
 486 {
 487     fprintf(stderr, "\
 488 Usage: %s [-e] [-E] [-v] [-V] [-t timeout] [-r report-file]\n\
 489      [-T phone-number] [-U phone-number2] {-f chat-file | chat-script}\n", program_name);
 490     exit(1);
 491 }
 492
 493 char line[1024];
 494
 495 /*
 496  * Send a message to syslog and/or stderr.
 497  */
 498 void msgf __V((const char *fmt, ...))
 499 {
 500     va_list args;
 501
 502 #ifdef __STDC__
 503     va_start(args, fmt);
 504 #else
 505     char *fmt;
 506     va_start(args);
 507     fmt = va_arg(args, char *);
 508 #endif
 509
 510     vfmtmsg(line, sizeof(line), fmt, args);
 511     if (to_log)
 512         syslog(LOG_INFO, "%s", line);
 513     if (to_stderr)
 514         fprintf(stderr, "%s\n", line);
 515 }
 516
 517 /*
 518  *      Print an error message and terminate.
 519  */
 520
 521 void fatal __V((int code, const char *fmt, ...))
 522 {
 523     va_list args;
 524
 525 #ifdef __STDC__
 526     va_start(args, fmt);
 527 #else
 528     int code;
 529     char *fmt;
 530     va_start(args);
 531     code = va_arg(args, int);
 532     fmt = va_arg(args, char *);
 533 #endif
 534
 535     vfmtmsg(line, sizeof(line), fmt, args);
 536     if (to_log)
 537         syslog(LOG_ERR, "%s", line);
 538     if (to_stderr)
 539         fprintf(stderr, "%s\n", line);
 540     terminate(code);
 541 }
 542
 543 int alarmed = 0;
 544
 545 SIGTYPE sigalrm(signo)
 546 int signo;
 547 {
 548     int flags;
 549
 550     alarm(1);
 551     alarmed = 1;                /* Reset alarm to avoid race window */
 552     signal(SIGALRM, sigalrm);   /* that can cause hanging in read() */
 553
 554     if ((flags = fcntl(0, F_GETFL, 0)) == -1)
 555         fatal(2, "Can't get file mode flags on stdin: %m");
 556
 557     if (fcntl(0, F_SETFL, flags | O_NONBLOCK) == -1)
 558         fatal(2, "Can't set file mode flags on stdin: %m");
 559
 560     if (verbose)
 561         msgf("alarm");
 562 }
 563
 564 void unalarm()
 565 {
 566     int flags;
 567
 568     if ((flags = fcntl(0, F_GETFL, 0)) == -1)
 569         fatal(2, "Can't get file mode flags on stdin: %m");
 570
 571     if (fcntl(0, F_SETFL, flags & ~O_NONBLOCK) == -1)
 572         fatal(2, "Can't set file mode flags on stdin: %m");
 573 }
 574
 575 SIGTYPE sigint(signo)
 576 int signo;
 577 {
 578     fatal(2, "SIGINT");
 579 }
 580
 581 SIGTYPE sigterm(signo)
 582 int signo;
 583 {
 584     fatal(2, "SIGTERM");
 585 }
 586
 587 SIGTYPE sighup(signo)
 588 int signo;
 589 {
 590     fatal(2, "SIGHUP");
 591 }
 592
 593 void init()
 594 {
 595     signal(SIGINT, sigint);
 596     signal(SIGTERM, sigterm);
 597     signal(SIGHUP, sighup);
 598
 599     set_tty_parameters();
 600     signal(SIGALRM, sigalrm);
 601     alarm(0);
 602     alarmed = 0;
 603 }
 604
 605 void set_tty_parameters()
 606 {
 607 #if defined(get_term_param)
 608     term_parms t;
 609
 610     if (get_term_param (&t) < 0)
 611         fatal(2, "Can't get terminal parameters: %m");
 612
 613     saved_tty_parameters = t;
 614     have_tty_parameters  = 1;
 615
 616     t.c_iflag     |= IGNBRK | ISTRIP | IGNPAR;
 617     t.c_oflag      = 0;
 618     t.c_lflag      = 0;
 619     t.c_cc[VERASE] =
 620     t.c_cc[VKILL]  = 0;
 621     t.c_cc[VMIN]   = 1;
 622     t.c_cc[VTIME]  = 0;
 623
 624     if (set_term_param (&t) < 0)
 625         fatal(2, "Can't set terminal parameters: %m");
 626 #endif
 627 }
 628
 629 void break_sequence()
 630 {
 631 #ifdef TERMIOS
 632     tcsendbreak (0, 0);
 633 #endif
 634 }
 635
 636 void terminate(status)
 637 int status;
 638 {
 639     static int terminating = 0;
 640
 641     if (terminating)
 642         exit(status);
 643     terminating = 1;
 644     echo_stderr(-1);
 645 /*
 646  * Allow the last of the report string to be gathered before we terminate.
 647  */
 648     if (report_gathering) {
 649         int c, rep_len;
 650
 651         rep_len = strlen(report_buffer);
 652         while (rep_len + 1 <= sizeof(report_buffer)) {
 653             alarm(1);
 654             c = get_char();
 655             alarm(0);
 656             if (c < 0 || iscntrl(c))
 657                 break;
 658             report_buffer[rep_len] = c;
 659             ++rep_len;
 660         }
 661         report_buffer[rep_len] = 0;
 662         fprintf (report_fp, "chat:  %s\n", report_buffer);
 663     }
 664     if (report_file != (char *) 0 && report_fp != (FILE *) NULL) {
 665         if (verbose)
 666             fprintf (report_fp, "Closing \"%s\".\n", report_file);
 667         fclose (report_fp);
 668         report_fp = (FILE *) NULL;
 669     }
 670
 671 #if defined(get_term_param)
 672     if (have_tty_parameters) {
 673         if (set_term_param (&saved_tty_parameters) < 0)
 674             fatal(2, "Can't restore terminal parameters: %m");
 675     }
 676 #endif
 677
 678     exit(status);
 679 }
 680
 681 /*
 682  *      'Clean up' this string.
 683  */
 684 char *clean(s, sending)
 685 register char *s;
 686 int sending;  /* set to 1 when sending (putting) this string. */
 687 {
 688     char cur_chr;
 689     char *s1, *p, *phchar;
 690     int add_return = sending;
 691     size_t len = strlen(s) + 3;         /* see len comments below */
 692
 693 #define isoctal(chr)    (((chr) >= '0') && ((chr) <= '7'))
 694 #define isalnumx(chr)   ((((chr) >= '0') && ((chr) <= '9')) \
 695                          || (((chr) >= 'a') && ((chr) <= 'z')) \
 696                          || (((chr) >= 'A') && ((chr) <= 'Z')) \
 697                          || (chr) == '_')
 698
 699     p = s1 = malloc(len);
 700     if (!p)
 701         fatal(2, "memory error!");
 702     while (*s) {
 703         cur_chr = *s++;
 704         if (cur_chr == '^') {
 705             cur_chr = *s++;
 706             if (cur_chr == '\0') {
 707                 *p++ = '^';
 708                 break;
 709             }
 710             cur_chr &= 0x1F;
 711             if (cur_chr != 0) {
 712                 *p++ = cur_chr;
 713             }
 714             continue;
 715         }
 716
 717         if (use_env && cur_chr == '$') {                /* ARI */
 718             char c;
 719
 720             phchar = s;
 721             while (isalnumx(*s))
 722                 s++;
 723             c = *s;             /* save */
 724             *s = '\0';
 725             phchar = getenv(phchar);
 726             *s = c;             /* restore */
 727             if (phchar) {
 728                 len += strlen(phchar);
 729                 s1 = grow(s1, &p, len);
 730                 while (*phchar)
 731                     *p++ = *phchar++;
 732             }
 733             continue;
 734         }
 735
 736         if (cur_chr != '\\') {
 737             *p++ = cur_chr;
 738             continue;
 739         }
 740
 741         cur_chr = *s++;
 742         if (cur_chr == '\0') {
 743             if (sending) {
 744                 *p++ = '\\';
 745                 *p++ = '\\';    /* +1 for len */
 746             }
 747             break;
 748         }
 749
 750         switch (cur_chr) {
 751         case 'b':
 752             *p++ = '\b';
 753             break;
 754
 755         case 'c':
 756             if (sending && *s == '\0')
 757                 add_return = 0;
 758             else
 759                 *p++ = cur_chr;
 760             break;
 761
 762         case '\\':
 763         case 'K':
 764         case 'p':
 765         case 'd':
 766             if (sending)
 767                 *p++ = '\\';
 768             *p++ = cur_chr;
 769             break;
 770
 771         case 'T':
 772             if (sending && phone_num) {
 773                 len += strlen(phone_num);
 774                 s1 = grow(s1, &p, len);
 775                 for (phchar = phone_num; *phchar != '\0'; phchar++)
 776                     *p++ = *phchar;
 777             }
 778             else {
 779                 *p++ = '\\';
 780                 *p++ = 'T';
 781             }
 782             break;
 783
 784         case 'U':
 785             if (sending && phone_num2) {
 786                 len += strlen(phone_num2);
 787                 s1 = grow(s1, &p, len);
 788                 for (phchar = phone_num2; *phchar != '\0'; phchar++)
 789                     *p++ = *phchar;
 790             }
 791             else {
 792                 *p++ = '\\';
 793                 *p++ = 'U';
 794             }
 795             break;
 796
 797         case 'q':
 798             quiet = 1;
 799             break;
 800
 801         case 'r':
 802             *p++ = '\r';
 803             break;
 804
 805         case 'n':
 806             *p++ = '\n';
 807             break;
 808
 809         case 's':
 810             *p++ = ' ';
 811             break;
 812
 813         case 't':
 814             *p++ = '\t';
 815             break;
 816
 817         case 'N':
 818             if (sending) {
 819                 *p++ = '\\';
 820                 *p++ = '\0';
 821             }
 822             else
 823                 *p++ = 'N';
 824             break;
 825
 826         case '$':                       /* ARI */
 827             if (use_env) {
 828                 *p++ = cur_chr;
 829                 break;
 830             }
 831             /* FALL THROUGH */
 832
 833         default:
 834             if (isoctal (cur_chr)) {
 835                 cur_chr &= 0x07;
 836                 if (isoctal (*s)) {
 837                     cur_chr <<= 3;
 838                     cur_chr |= *s++ - '0';
 839                     if (isoctal (*s)) {
 840                         cur_chr <<= 3;
 841                         cur_chr |= *s++ - '0';
 842                     }
 843                 }
 844
 845                 if (cur_chr != 0 || sending) {
 846                     if (sending && (cur_chr == '\\' || cur_chr == 0))
 847                         *p++ = '\\';
 848                     *p++ = cur_chr;
 849                 }
 850                 break;
 851             }
 852
 853             if (sending)
 854                 *p++ = '\\';
 855             *p++ = cur_chr;
 856             break;
 857         }
 858     }
 859
 860     if (add_return)
 861         *p++ = '\r';    /* +2 for len */
 862
 863     *p = '\0';          /* +3 for len */
 864     return s1;
 865 }
 866
 867 /*
 868  * A modified version of 'strtok'. This version skips \ sequences.
 869  */
 870
 871 char *expect_strtok (s, term)
 872      char *s, *term;
 873 {
 874     static  char *str   = "";
 875     int     escape_flag = 0;
 876     char   *result;
 877
 878 /*
 879  * If a string was specified then do initial processing.
 880  */
 881     if (s)
 882         str = s;
 883
 884 /*
 885  * If this is the escape flag then reset it and ignore the character.
 886  */
 887     if (*str)
 888         result = str;
 889     else
 890         result = (char *) 0;
 891
 892     while (*str) {
 893         if (escape_flag) {
 894             escape_flag = 0;
 895             ++str;
 896             continue;
 897         }
 898
 899         if (*str == '\\') {
 900             ++str;
 901             escape_flag = 1;
 902             continue;
 903         }
 904
 905 /*
 906  * If this is not in the termination string, continue.
 907  */
 908         if (strchr (term, *str) == (char *) 0) {
 909             ++str;
 910             continue;
 911         }
 912
 913 /*
 914  * This is the terminator. Mark the end of the string and stop.
 915  */
 916         *str++ = '\0';
 917         break;
 918     }
 919     return (result);
 920 }
 921
 922 /*
 923  * Process the expect string
 924  */
 925
 926 void chat_expect (s)
 927 char *s;
 928 {
 929     char *expect;
 930     char *reply;
 931
 932     if (strcmp(s, "HANGUP") == 0) {
 933         ++hup_next;
 934         return;
 935     }
 936
 937     if (strcmp(s, "ABORT") == 0) {
 938         ++abort_next;
 939         return;
 940     }
 941
 942     if (strcmp(s, "CLR_ABORT") == 0) {
 943         ++clear_abort_next;
 944         return;
 945     }
 946
 947     if (strcmp(s, "REPORT") == 0) {
 948         ++report_next;
 949         return;
 950     }
 951
 952     if (strcmp(s, "CLR_REPORT") == 0) {
 953         ++clear_report_next;
 954         return;
 955     }
 956
 957     if (strcmp(s, "TIMEOUT") == 0) {
 958         ++timeout_next;
 959         return;
 960     }
 961
 962     if (strcmp(s, "ECHO") == 0) {
 963         ++echo_next;
 964         return;
 965     }
 966
 967     if (strcmp(s, "SAY") == 0) {
 968         ++say_next;
 969         return;
 970     }
 971
 972 /*
 973  * Fetch the expect and reply string.
 974  */
 975     for (;;) {
 976         expect = expect_strtok (s, "-");
 977         s      = (char *) 0;
 978
 979         if (expect == (char *) 0)
 980             return;
 981
 982         reply = expect_strtok (s, "-");
 983
 984 /*
 985  * Handle the expect string. If successful then exit.
 986  */
 987         if (get_string (expect))
 988             return;
 989
 990 /*
 991  * If there is a sub-reply string then send it. Otherwise any condition
 992  * is terminal.
 993  */
 994         if (reply == (char *) 0 || exit_code != 3)
 995             break;
 996
 997         chat_send (reply);
 998     }
 999
1000 /*
1001  * The expectation did not occur. This is terminal.
1002  */
1003     if (fail_reason)
1004         msgf("Failed (%s)", fail_reason);
1005     else
1006         msgf("Failed");
1007     terminate(exit_code);
1008 }
1009
1010 /*
1011  * Translate the input character to the appropriate string for printing
1012  * the data.
1013  */
1014
1015 char *character(c)
1016 int c;
1017 {
1018     static char string[10];
1019     char *meta;
1020
1021     meta = (c & 0x80) ? "M-" : "";
1022     c &= 0x7F;
1023
1024     if (c < 32)
1025         sprintf(string, "%s^%c", meta, (int)c + '@');
1026     else if (c == 127)
1027         sprintf(string, "%s^?", meta);
1028     else
1029         sprintf(string, "%s%c", meta, c);
1030
1031     return (string);
1032 }
1033
1034 /*
1035  *  process the reply string
1036  */
1037 void chat_send (s)
1038 register char *s;
1039 {
1040     char file_data[STR_LEN];
1041
1042     if (say_next) {
1043         say_next = 0;
1044         s = clean(s, 1);
1045         write(2, s, strlen(s));
1046         free(s);
1047         return;
1048     }
1049
1050     if (hup_next) {
1051         hup_next = 0;
1052         if (strcmp(s, "OFF") == 0)
1053            signal(SIGHUP, SIG_IGN);
1054         else
1055            signal(SIGHUP, sighup);
1056         return;
1057     }
1058
1059     if (echo_next) {
1060         echo_next = 0;
1061         echo = (strcmp(s, "ON") == 0);
1062         return;
1063     }
1064
1065     if (abort_next) {
1066         char *s1;
1067
1068         abort_next = 0;
1069
1070         if (n_aborts >= MAX_ABORTS)
1071             fatal(2, "Too many ABORT strings");
1072
1073         s1 = clean(s, 0);
1074
1075         if (strlen(s1) > strlen(s)
1076             || strlen(s1) + 1 > sizeof(fail_buffer))
1077             fatal(1, "Illegal or too-long ABORT string ('%v')", s);
1078
1079         abort_string[n_aborts++] = s1;
1080
1081         if (verbose)
1082             msgf("abort on (%v)", s);
1083         return;
1084     }
1085
1086     if (clear_abort_next) {
1087         char *s1;
1088         int   i;
1089         int   old_max;
1090         int   pack = 0;
1091
1092         clear_abort_next = 0;
1093
1094         s1 = clean(s, 0);
1095
1096         if (strlen(s1) > strlen(s)
1097             || strlen(s1) + 1 > sizeof(fail_buffer))
1098             fatal(1, "Illegal or too-long CLR_ABORT string ('%v')", s);
1099
1100         old_max = n_aborts;
1101         for (i=0; i < n_aborts; i++) {
1102             if ( strcmp(s1,abort_string[i]) == 0 ) {
1103                 free(abort_string[i]);
1104                 abort_string[i] = NULL;
1105                 pack++;
1106                 n_aborts--;
1107                 if (verbose)
1108                     msgf("clear abort on (%v)", s);
1109             }
1110         }
1111         free(s1);
1112         if (pack)
1113             pack_array(abort_string,old_max);
1114         return;
1115     }
1116
1117     if (report_next) {
1118         char *s1;
1119
1120         report_next = 0;
1121         if (n_reports >= MAX_REPORTS)
1122             fatal(2, "Too many REPORT strings");
1123
1124         s1 = clean(s, 0);
1125         if (strlen(s1) > strlen(s)
1126             || strlen(s1) + 1 > sizeof(fail_buffer))
1127             fatal(1, "Illegal or too-long REPORT string ('%v')", s);
1128
1129         report_string[n_reports++] = s1;
1130
1131         if (verbose)
1132             msgf("report (%v)", s);
1133         return;
1134     }
1135
1136     if (clear_report_next) {
1137         char *s1;
1138         int   i;
1139         int   old_max;
1140         int   pack = 0;
1141
1142         clear_report_next = 0;
1143
1144         s1 = clean(s, 0);
1145
1146         if (strlen(s1) > strlen(s)
1147             || strlen(s1) + 1 > sizeof(fail_buffer))
1148             fatal(1, "Illegal or too-long REPORT string ('%v')", s);
1149
1150         old_max = n_reports;
1151         for (i=0; i < n_reports; i++) {
1152             if ( strcmp(s1,report_string[i]) == 0 ) {
1153                 free(report_string[i]);
1154                 report_string[i] = NULL;
1155                 pack++;
1156                 n_reports--;
1157                 if (verbose)
1158                     msgf("clear report (%v)", s);
1159             }
1160         }
1161         free(s1);
1162         if (pack)
1163             pack_array(report_string,old_max);
1164
1165         return;
1166     }
1167
1168     if (timeout_next) {
1169         timeout_next = 0;
1170         timeout = atoi(s);
1171
1172         if (timeout <= 0)
1173             timeout = DEFAULT_CHAT_TIMEOUT;
1174
1175         if (verbose)
1176             msgf("timeout set to %d seconds", timeout);
1177
1178         return;
1179     }
1180
1181     /*
1182      * The syntax @filename means read the string to send from the
1183      * file `filename'.
1184      */
1185     if (s[0] == '@') {
1186         /* skip the @ and any following white-space */
1187         char *fn = s;
1188         while (*++fn == ' ' || *fn == '\t')
1189             ;
1190
1191         if (*fn != 0) {
1192             FILE *f;
1193             int n = 0;
1194
1195             /* open the file and read until STR_LEN-1 bytes or end-of-file */
1196             f = fopen(fn, "r");
1197             if (f == NULL)
1198                 fatal(1, "%s -- open failed: %m", fn);
1199             while (n < STR_LEN - 1) {
1200                 int nr = fread(&file_data[n], 1, STR_LEN - 1 - n, f);
1201                 if (nr < 0)
1202                     fatal(1, "%s -- read error", fn);
1203                 if (nr == 0)
1204                     break;
1205                 n += nr;
1206             }
1207             fclose(f);
1208
1209             /* use the string we got as the string to send,
1210                but trim off the final newline if any. */
1211             if (n > 0 && file_data[n-1] == '\n')
1212                 --n;
1213             file_data[n] = 0;
1214             s = file_data;
1215         }
1216     }
1217
1218     if (strcmp(s, "EOT") == 0)
1219         s = "^D\\c";
1220     else if (strcmp(s, "BREAK") == 0)
1221         s = "\\K\\c";
1222
1223     if (!put_string(s))
1224         fatal(1, "Failed");
1225 }
1226
1227 int get_char()
1228 {
1229     int status;
1230     char c;
1231
1232     status = read(0, &c, 1);
1233
1234     switch (status) {
1235     case 1:
1236         return ((int)c & 0x7F);
1237
1238     default:
1239         msgf("warning: read() on stdin returned %d", status);
1240
1241     case -1:
1242         if ((status = fcntl(0, F_GETFL, 0)) == -1)
1243             fatal(2, "Can't get file mode flags on stdin: %m");
1244
1245         if (fcntl(0, F_SETFL, status & ~O_NONBLOCK) == -1)
1246             fatal(2, "Can't set file mode flags on stdin: %m");
1247
1248         return (-1);
1249     }
1250 }
1251
1252 int put_char(c)
1253 int c;
1254 {
1255     int status;
1256     char ch = c;
1257
1258     usleep(10000);              /* inter-character typing delay (?) */
1259
1260     status = write(1, &ch, 1);
1261
1262     switch (status) {
1263     case 1:
1264         return (0);
1265
1266     default:
1267         msgf("warning: write() on stdout returned %d", status);
1268
1269     case -1:
1270         if ((status = fcntl(0, F_GETFL, 0)) == -1)
1271             fatal(2, "Can't get file mode flags on stdin, %m");
1272
1273         if (fcntl(0, F_SETFL, status & ~O_NONBLOCK) == -1)
1274             fatal(2, "Can't set file mode flags on stdin: %m");
1275
1276         return (-1);
1277     }
1278 }
1279
1280 int write_char (c)
1281 int c;
1282 {
1283     if (alarmed || put_char(c) < 0) {
1284         alarm(0);
1285         alarmed = 0;
1286
1287         if (verbose) {
1288             if (errno == EINTR || errno == EWOULDBLOCK)
1289                 msgf(" -- write timed out");
1290             else
1291                 msgf(" -- write failed: %m");
1292         }
1293         return (0);
1294     }
1295     return (1);
1296 }
1297
1298 int put_string (s)
1299 register char *s;
1300 {
1301     quiet = 0;
1302     s = clean(s, 1);
1303
1304     if (verbose) {
1305         if (quiet)
1306             msgf("send (?????\?)");
1307         else
1308             msgf("send (%v)", s);
1309     }
1310
1311     alarm(timeout); alarmed = 0;
1312
1313     while (*s) {
1314         register char c = *s++;
1315
1316         if (c != '\\') {
1317             if (!write_char (c))
1318                 return 0;
1319             continue;
1320         }
1321
1322         c = *s++;
1323         switch (c) {
1324         case 'd':
1325             sleep(1);
1326             break;
1327
1328         case 'K':
1329             break_sequence();
1330             break;
1331
1332         case 'p':
1333             usleep(10000);      /* 1/100th of a second (arg is microseconds) */
1334             break;
1335
1336         default:
1337             if (!write_char (c))
1338                 return 0;
1339             break;
1340         }
1341     }
1342
1343     alarm(0);
1344     alarmed = 0;
1345     return (1);
1346 }
1347
1348 /*
1349  *      Echo a character to stderr.
1350  *      When called with -1, a '\n' character is generated when
1351  *      the cursor is not at the beginning of a line.
1352  */
1353 void echo_stderr(n)
1354 int n;
1355 {
1356     static int need_lf;
1357     char *s;
1358
1359     switch (n) {
1360     case '\r':          /* ignore '\r' */
1361         break;
1362     case -1:
1363         if (need_lf == 0)
1364             break;
1365         /* fall through */
1366     case '\n':
1367         write(2, "\n", 1);
1368         need_lf = 0;
1369         break;
1370     default:
1371         s = character(n);
1372         write(2, s, strlen(s));
1373         need_lf = 1;
1374         break;
1375     }
1376 }
1377
1378 /*
1379  *      'Wait for' this string to appear on this file descriptor.
1380  */
1381 int get_string(string)
1382 register char *string;
1383 {
1384     char temp[STR_LEN];
1385     int c, printed = 0, len, minlen;
1386     register char *s = temp, *end = s + STR_LEN;
1387     char *logged = temp;
1388
1389     fail_reason = (char *)0;
1390     string = clean(string, 0);
1391     len = strlen(string);
1392     minlen = (len > sizeof(fail_buffer)? len: sizeof(fail_buffer)) - 1;
1393
1394     if (verbose)
1395         msgf("expect (%v)", string);
1396
1397     if (len > STR_LEN) {
1398         msgf("expect string is too long");
1399         exit_code = 1;
1400         return 0;
1401     }
1402
1403     if (len == 0) {
1404         if (verbose)
1405             msgf("got it");
1406         return (1);
1407     }
1408
1409     alarm(timeout);
1410     alarmed = 0;
1411
1412     while ( ! alarmed && (c = get_char()) >= 0) {
1413         int n, abort_len, report_len;
1414
1415         if (echo)
1416             echo_stderr(c);
1417         if (verbose && c == '\n') {
1418             if (s == logged)
1419                 msgf("");       /* blank line */
1420             else
1421                 msgf("%0.*v", s - logged, logged);
1422             logged = s + 1;
1423         }
1424
1425         *s++ = c;
1426
1427         if (verbose && s >= logged + 80) {
1428             msgf("%0.*v", s - logged, logged);
1429             logged = s;
1430         }
1431
1432         if (Verbose) {
1433            if (c == '\n')
1434                fputc( '\n', stderr );
1435            else if (c != '\r')
1436                fprintf( stderr, "%s", character(c) );
1437         }
1438
1439         if (!report_gathering) {
1440             for (n = 0; n < n_reports; ++n) {
1441                 if ((report_string[n] != (char*) NULL) &&
1442                     s - temp >= (report_len = strlen(report_string[n])) &&
1443                     strncmp(s - report_len, report_string[n], report_len) == 0) {
1444                     time_t time_now   = time ((time_t*) NULL);
1445                     struct tm* tm_now = localtime (&time_now);
1446
1447                     strftime (report_buffer, 20, "%b %d %H:%M:%S ", tm_now);
1448                     strcat (report_buffer, report_string[n]);
1449
1450                     report_string[n] = (char *) NULL;
1451                     report_gathering = 1;
1452                     break;
1453                 }
1454             }
1455         }
1456         else {
1457             if (!iscntrl (c)) {
1458                 int rep_len = strlen (report_buffer);
1459                 report_buffer[rep_len]     = c;
1460                 report_buffer[rep_len + 1] = '\0';
1461             }
1462             else {
1463                 report_gathering = 0;
1464                 fprintf (report_fp, "chat:  %s\n", report_buffer);
1465             }
1466         }
1467
1468         if (s - temp >= len &&
1469             c == string[len - 1] &&
1470             strncmp(s - len, string, len) == 0) {
1471             if (verbose) {
1472                 if (s > logged)
1473                     msgf("%0.*v", s - logged, logged);
1474                 msgf(" -- got it\n");
1475             }
1476
1477             alarm(0);
1478             alarmed = 0;
1479             return (1);
1480         }
1481
1482         for (n = 0; n < n_aborts; ++n) {
1483             if (s - temp >= (abort_len = strlen(abort_string[n])) &&
1484                 strncmp(s - abort_len, abort_string[n], abort_len) == 0) {
1485                 if (verbose) {
1486                     if (s > logged)
1487                         msgf("%0.*v", s - logged, logged);
1488                     msgf(" -- failed");
1489                 }
1490
1491                 alarm(0);
1492                 alarmed = 0;
1493                 exit_code = n + 4;
1494                 strcpy(fail_reason = fail_buffer, abort_string[n]);
1495                 return (0);
1496             }
1497         }
1498
1499         if (s >= end) {
1500             if (logged < s - minlen) {
1501                 if (verbose)
1502                     msgf("%0.*v", s - logged, logged);
1503                 logged = s;
1504             }
1505             s -= minlen;
1506             memmove(temp, s, minlen);
1507             logged = temp + (logged - s);
1508             s = temp + minlen;
1509         }
1510
1511         if (alarmed && verbose)
1512             msgf("warning: alarm synchronization problem");
1513     }
1514
1515     alarm(0);
1516
1517     if (verbose && printed) {
1518         if (alarmed)
1519             msgf(" -- read timed out");
1520         else
1521             msgf(" -- read failed: %m");
1522     }
1523
1524     exit_code = 3;
1525     alarmed   = 0;
1526     return (0);
1527 }
1528
1529 /*
1530  * Gross kludge to handle Solaris versions >= 2.6 having usleep.
1531  */
1532 #ifdef SOL2
1533 #include <sys/param.h>
1534 #if MAXUID > 65536              /* then this is Solaris 2.6 or later */
1535 #undef NO_USLEEP
1536 #endif
1537 #endif /* SOL2 */
1538
1539 #ifdef NO_USLEEP
1540 #include <sys/types.h>
1541 #include <sys/time.h>
1542
1543 /*
1544   usleep -- support routine for 4.2BSD system call emulations
1545   last edit:  29-Oct-1984     D A Gwyn
1546   */
1547
1548 extern int        select();
1549
1550 int
1551 usleep( usec )                            /* returns 0 if ok, else -1 */
1552     long                usec;           /* delay in microseconds */
1553 {
1554     static struct {             /* `timeval' */
1555         long    tv_sec;         /* seconds */
1556         long    tv_usec;        /* microsecs */
1557     } delay;                    /* _select() timeout */
1558
1559     delay.tv_sec  = usec / 1000000L;
1560     delay.tv_usec = usec % 1000000L;
1561
1562     return select(0, (long *)0, (long *)0, (long *)0, &delay);
1563 }
1564 #endif
1565
1566 void
1567 pack_array (array, end)
1568     char **array; /* The address of the array of string pointers */
1569     int    end;   /* The index of the next free entry before CLR_ */
1570 {
1571     int i, j;
1572
1573     for (i = 0; i < end; i++) {
1574         if (array[i] == NULL) {
1575             for (j = i+1; j < end; ++j)
1576                 if (array[j] != NULL)
1577                     array[i++] = array[j];
1578             for (; i < end; ++i)
1579                 array[i] = NULL;
1580             break;
1581         }
1582     }
1583 }
1584
1585 /*
1586  * vfmtmsg - format a message into a buffer.  Like vsprintf except we
1587  * also specify the length of the output buffer, and we handle the
1588  * %m (error message) format.
1589  * Doesn't do floating-point formats.
1590  * Returns the number of chars put into buf.
1591  */
1592 #define OUTCHAR(c)      (buflen > 0? (--buflen, *buf++ = (c)): 0)
1593
1594 int
1595 vfmtmsg(buf, buflen, fmt, args)
1596     char *buf;
1597     int buflen;
1598     const char *fmt;
1599     va_list args;
1600 {
1601     int c, i, n;
1602     int width, prec, fillch;
1603     int base, len, neg, quoted;
1604     unsigned long val = 0;
1605     char *str, *buf0;
1606     const char *f;
1607     unsigned char *p;
1608     char num[32];
1609     static char hexchars[] = "0123456789abcdef";
1610
1611     buf0 = buf;
1612     --buflen;
1613     while (buflen > 0) {
1614         for (f = fmt; *f != '%' && *f != 0; ++f)
1615             ;
1616         if (f > fmt) {
1617             len = f - fmt;
1618             if (len > buflen)
1619                 len = buflen;
1620             memcpy(buf, fmt, len);
1621             buf += len;
1622             buflen -= len;
1623             fmt = f;
1624         }
1625         if (*fmt == 0)
1626             break;
1627         c = *++fmt;
1628         width = prec = 0;
1629         fillch = ' ';
1630         if (c == '0') {
1631             fillch = '0';
1632             c = *++fmt;
1633         }
1634         if (c == '*') {
1635             width = va_arg(args, int);
1636             c = *++fmt;
1637         } else {
1638             while (isdigit(c)) {
1639                 width = width * 10 + c - '0';
1640                 c = *++fmt;
1641             }
1642         }
1643         if (c == '.') {
1644             c = *++fmt;
1645             if (c == '*') {
1646                 prec = va_arg(args, int);
1647                 c = *++fmt;
1648             } else {
1649                 while (isdigit(c)) {
1650                     prec = prec * 10 + c - '0';
1651                     c = *++fmt;
1652                 }
1653             }
1654         }
1655         str = 0;
1656         base = 0;
1657         neg = 0;
1658         ++fmt;
1659         switch (c) {
1660         case 'd':
1661             i = va_arg(args, int);
1662             if (i < 0) {
1663                 neg = 1;
1664                 val = -i;
1665             } else
1666                 val = i;
1667             base = 10;
1668             break;
1669         case 'o':
1670             val = va_arg(args, unsigned int);
1671             base = 8;
1672             break;
1673         case 'x':
1674             val = va_arg(args, unsigned int);
1675             base = 16;
1676             break;
1677         case 'p':
1678             val = (unsigned long) va_arg(args, void *);
1679             base = 16;
1680             neg = 2;
1681             break;
1682         case 's':
1683             str = va_arg(args, char *);
1684             break;
1685         case 'c':
1686             num[0] = va_arg(args, int);
1687             num[1] = 0;
1688             str = num;
1689             break;
1690         case 'm':
1691             str = strerror(errno);
1692             break;
1693         case 'v':               /* "visible" string */
1694         case 'q':               /* quoted string */
1695             quoted = c == 'q';
1696             p = va_arg(args, unsigned char *);
1697             if (fillch == '0' && prec > 0) {
1698                 n = prec;
1699             } else {
1700                 n = strlen((char *)p);
1701                 if (prec > 0 && prec < n)
1702                     n = prec;
1703             }
1704             while (n > 0 && buflen > 0) {
1705                 c = *p++;
1706                 --n;
1707                 if (!quoted && c >= 0x80) {
1708                     OUTCHAR('M');
1709                     OUTCHAR('-');
1710                     c -= 0x80;
1711                 }
1712                 if (quoted && (c == '"' || c == '\\'))
1713                     OUTCHAR('\\');
1714                 if (c < 0x20 || (0x7f <= c && c < 0xa0)) {
1715                     if (quoted) {
1716                         OUTCHAR('\\');
1717                         switch (c) {
1718                         case '\t':      OUTCHAR('t');   break;
1719                         case '\n':      OUTCHAR('n');   break;
1720                         case '\b':      OUTCHAR('b');   break;
1721                         case '\f':      OUTCHAR('f');   break;
1722                         default:
1723                             OUTCHAR('x');
1724                             OUTCHAR(hexchars[c >> 4]);
1725                             OUTCHAR(hexchars[c & 0xf]);
1726                         }
1727                     } else {
1728                         if (c == '\t')
1729                             OUTCHAR(c);
1730                         else {
1731                             OUTCHAR('^');
1732                             OUTCHAR(c ^ 0x40);
1733                         }
1734                     }
1735                 } else
1736                     OUTCHAR(c);
1737             }
1738             continue;
1739         default:
1740             *buf++ = '%';
1741             if (c != '%')
1742                 --fmt;          /* so %z outputs %z etc. */
1743             --buflen;
1744             continue;
1745         }
1746         if (base != 0) {
1747             str = num + sizeof(num);
1748             *--str = 0;
1749             while (str > num + neg) {
1750                 *--str = hexchars[val % base];
1751                 val = val / base;
1752                 if (--prec <= 0 && val == 0)
1753                     break;
1754             }
1755             switch (neg) {
1756             case 1:
1757                 *--str = '-';
1758                 break;
1759             case 2:
1760                 *--str = 'x';
1761                 *--str = '0';
1762                 break;
1763             }
1764             len = num + sizeof(num) - 1 - str;
1765         } else {
1766             len = strlen(str);
1767             if (prec > 0 && len > prec)
1768                 len = prec;
1769         }
1770         if (width > 0) {
1771             if (width > buflen)
1772                 width = buflen;
1773             if ((n = width - len) > 0) {
1774                 buflen -= n;
1775                 for (; n > 0; --n)
1776                     *buf++ = fillch;
1777             }
1778         }
1779         if (len > buflen)
1780             len = buflen;
1781         memcpy(buf, str, len);
1782         buf += len;
1783         buflen -= len;
1784     }
1785     *buf = 0;
1786     return buf - buf0;
1787 }