2 * Chat -- a program for automatic session establishment (i.e. dial
3 * the phone and log in).
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.
14 * This software is in the public domain.
17 * 22-May-99 added environment substitutuion, enabled with -E switch.
18 * Andreas Arens <andras@cityweb.de>.
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>.
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>
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).
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.
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.
47 * In the same vein as above, added CLR_REPORT keyword.
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.
54 * Francis Demierre <Francis@SwissMail.Com>
55 * Thu May 15 17:15:40 MET DST 1997
58 * Added -r "report file" switch & REPORT keyword.
59 * Robert Geer <bgeer@xmission.com>
61 * Added -s "use stderr" and -S "don't use syslog" switches.
63 * Karl O. Pinc <kop@meme.com>
66 * Added -e "echo" switch & ECHO keyword
67 * Dick Streefland <dicks@tasking.nl>
70 * Considerable updates and modifications by
71 * Al Longyear <longyear@pobox.com>
72 * Paul Mackerras <paulus@cs.anu.edu.au>
75 * The original author is:
77 * Karl Fox <karl@MorningStar.Com>
78 * Morning Star Technologies, Inc.
90 static const char rcsid[] = "$Id: chat.c,v 1.27 2002/01/11 18:05:44 etbe Exp $";
102 #include <sys/types.h>
103 #include <sys/stat.h>
133 #define __V(x) (va_alist) va_dcl
139 #define O_NONBLOCK O_NDELAY
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)] :\
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)
159 static int _O = 0; /* Internal state */
160 /*************** Micro getopt() *********************************************/
164 #define MAX_ABORTS 50
165 #define MAX_REPORTS 50
166 #define DEFAULT_CHAT_TIMEOUT 45
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;
184 int have_tty_parameters = 0;
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;
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;
200 char *abort_string[MAX_ABORTS], *fail_reason = (char *)0,
202 int n_aborts = 0, abort_next = 0, timeout_next = 0, echo_next = 0;
203 int clear_abort_next = 0;
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;
210 int say_next = 0, hup_next = 0;
212 void *dup_mem __P((void *b, size_t c));
213 void *copy_of __P((char *s));
214 void usage __P((void));
215 void logf __P((const char *fmt, ...));
216 void fatal __P((int code, const char *fmt, ...));
217 SIGTYPE sigalrm __P((int signo));
218 SIGTYPE sigint __P((int signo));
219 SIGTYPE sigterm __P((int signo));
220 SIGTYPE sighup __P((int signo));
221 void unalarm __P((void));
222 void init __P((void));
223 void set_tty_parameters __P((void));
224 void echo_stderr __P((int));
225 void break_sequence __P((void));
226 void terminate __P((int status));
227 void do_file __P((char *chat_file));
228 int get_string __P((register char *string));
229 int put_string __P((register char *s));
230 int write_char __P((int c));
231 int put_char __P((int c));
232 int get_char __P((void));
233 void chat_send __P((register char *s));
234 char *character __P((int c));
235 void chat_expect __P((register char *s));
236 char *clean __P((register char *s, int sending));
237 void break_sequence __P((void));
238 void terminate __P((int status));
239 void pack_array __P((char **array, int end));
240 char *expect_strtok __P((char *, char *));
241 int vfmtmsg __P((char *, int, const char *, va_list)); /* vsprintf++ */
243 int main __P((int, char *[]));
249 void *ans = malloc (c);
251 fatal(2, "memory error!");
260 return dup_mem (s, strlen (s) + 1);
264 * chat [ -v ] [ -E ] [ -T number ] [ -U number ] [ -t timeout ] [ -f chat-file ] \
265 * [ -r report-file ] \
266 * [...[[expect[-say[-expect...]] say expect[-say[-expect]] ...]]]
268 * Perform a UUCP-dialer-like chat script on stdin and stdout.
278 program_name = *argv;
281 while ((option = OPTION(argc, argv)) != 0) {
308 if ((arg = OPTARG(argc, argv)) != NULL)
309 chat_file = copy_of(arg);
315 if ((arg = OPTARG(argc, argv)) != NULL)
322 arg = OPTARG (argc, argv);
324 if (report_fp != NULL)
326 report_file = copy_of (arg);
327 report_fp = fopen (report_file, "a");
328 if (report_fp != NULL) {
330 fprintf (report_fp, "Opening \"%s\"...\n",
338 if ((arg = OPTARG(argc, argv)) != NULL)
339 phone_num = copy_of(arg);
345 if ((arg = OPTARG(argc, argv)) != NULL)
346 phone_num2 = copy_of(arg);
357 * Default the report file to the stderr location
359 if (report_fp == NULL)
364 openlog("chat", LOG_PID);
366 openlog("chat", LOG_PID | LOG_NDELAY, LOG_LOCAL2);
369 setlogmask(LOG_UPTO(LOG_INFO));
371 setlogmask(LOG_UPTO(LOG_WARNING));
377 if (chat_file != NULL) {
378 arg = ARG(argc, argv);
384 while ((arg = ARG(argc, argv)) != NULL) {
387 if ((arg = ARG(argc, argv)) != NULL)
397 * Process a chat script when read from a file.
400 void do_file (chat_file)
404 char *sp, *arg, quote;
408 cfp = fopen (chat_file, "r");
410 fatal(1, "%s -- open failed: %m", chat_file);
415 while (fgets(buf, STR_LEN, cfp) != NULL) {
416 sp = strchr (buf, '\n');
423 /* lines starting with '#' are comments. If a real '#'
424 is to be expected, it should be quoted .... */
428 while (*sp != '\0') {
429 if (*sp == ' ' || *sp == '\t') {
434 if (*sp == '"' || *sp == '\'') {
437 while (*sp != quote) {
439 fatal(1, "unterminated quote (line %d)", linect);
449 while (*sp != '\0' && *sp != ' ' && *sp != '\t')
467 * We got an error parsing the command line.
472 Usage: %s [-e] [-E] [-v] [-V] [-t timeout] [-r report-file]\n\
473 [-T phone-number] [-U phone-number2] {-f chat-file | chat-script}\n", program_name);
480 * Send a message to syslog and/or stderr.
482 void logf __V((const char *fmt, ...))
491 fmt = va_arg(args, char *);
494 vfmtmsg(line, sizeof(line), fmt, args);
496 syslog(LOG_INFO, "%s", line);
498 fprintf(stderr, "%s\n", line);
502 * Print an error message and terminate.
505 void fatal __V((int code, const char *fmt, ...))
515 code = va_arg(args, int);
516 fmt = va_arg(args, char *);
519 vfmtmsg(line, sizeof(line), fmt, args);
521 syslog(LOG_ERR, "%s", line);
523 fprintf(stderr, "%s\n", line);
529 SIGTYPE sigalrm(signo)
535 alarmed = 1; /* Reset alarm to avoid race window */
536 signal(SIGALRM, sigalrm); /* that can cause hanging in read() */
538 if ((flags = fcntl(0, F_GETFL, 0)) == -1)
539 fatal(2, "Can't get file mode flags on stdin: %m");
541 if (fcntl(0, F_SETFL, flags | O_NONBLOCK) == -1)
542 fatal(2, "Can't set file mode flags on stdin: %m");
552 if ((flags = fcntl(0, F_GETFL, 0)) == -1)
553 fatal(2, "Can't get file mode flags on stdin: %m");
555 if (fcntl(0, F_SETFL, flags & ~O_NONBLOCK) == -1)
556 fatal(2, "Can't set file mode flags on stdin: %m");
559 SIGTYPE sigint(signo)
565 SIGTYPE sigterm(signo)
571 SIGTYPE sighup(signo)
579 signal(SIGINT, sigint);
580 signal(SIGTERM, sigterm);
581 signal(SIGHUP, sighup);
583 set_tty_parameters();
584 signal(SIGALRM, sigalrm);
589 void set_tty_parameters()
591 #if defined(get_term_param)
594 if (get_term_param (&t) < 0)
595 fatal(2, "Can't get terminal parameters: %m");
597 saved_tty_parameters = t;
598 have_tty_parameters = 1;
600 t.c_iflag |= IGNBRK | ISTRIP | IGNPAR;
608 if (set_term_param (&t) < 0)
609 fatal(2, "Can't set terminal parameters: %m");
613 void break_sequence()
620 void terminate(status)
623 static int terminating = 0;
630 * Allow the last of the report string to be gathered before we terminate.
632 if (report_gathering) {
635 rep_len = strlen(report_buffer);
636 while (rep_len + 1 <= sizeof(report_buffer)) {
640 if (c < 0 || iscntrl(c))
642 report_buffer[rep_len] = c;
645 report_buffer[rep_len] = 0;
646 fprintf (report_fp, "chat: %s\n", report_buffer);
648 if (report_file != (char *) 0 && report_fp != (FILE *) NULL) {
650 fprintf (report_fp, "Closing \"%s\".\n", report_file);
652 report_fp = (FILE *) NULL;
655 #if defined(get_term_param)
656 if (have_tty_parameters) {
657 if (set_term_param (&saved_tty_parameters) < 0)
658 fatal(2, "Can't restore terminal parameters: %m");
666 * 'Clean up' this string.
668 char *clean(s, sending)
670 int sending; /* set to 1 when sending (putting) this string. */
672 char temp[STR_LEN], env_str[STR_LEN], cur_chr;
673 register char *s1, *phchar;
674 int add_return = sending;
675 #define isoctal(chr) (((chr) >= '0') && ((chr) <= '7'))
676 #define isalnumx(chr) ((((chr) >= '0') && ((chr) <= '9')) \
677 || (((chr) >= 'a') && ((chr) <= 'z')) \
678 || (((chr) >= 'A') && ((chr) <= 'Z')) \
684 if (cur_chr == '^') {
686 if (cur_chr == '\0') {
697 if (use_env && cur_chr == '$') { /* ARI */
702 phchar = getenv(env_str);
709 if (cur_chr != '\\') {
715 if (cur_chr == '\0') {
729 if (sending && *s == '\0')
745 if (sending && phone_num) {
746 for (phchar = phone_num; *phchar != '\0'; phchar++)
756 if (sending && phone_num2) {
757 for (phchar = phone_num2; *phchar != '\0'; phchar++)
803 if (isoctal (cur_chr)) {
807 cur_chr |= *s++ - '0';
810 cur_chr |= *s++ - '0';
814 if (cur_chr != 0 || sending) {
815 if (sending && (cur_chr == '\\' || cur_chr == 0))
832 *s1++ = '\0'; /* guarantee closure */
833 *s1++ = '\0'; /* terminate the string */
834 return dup_mem (temp, (size_t) (s1 - temp)); /* may have embedded nuls */
838 * A modified version of 'strtok'. This version skips \ sequences.
841 char *expect_strtok (s, term)
844 static char *str = "";
849 * If a string was specified then do initial processing.
855 * If this is the escape flag then reset it and ignore the character.
876 * If this is not in the termination string, continue.
878 if (strchr (term, *str) == (char *) 0) {
884 * This is the terminator. Mark the end of the string and stop.
893 * Process the expect string
902 if (strcmp(s, "HANGUP") == 0) {
907 if (strcmp(s, "ABORT") == 0) {
912 if (strcmp(s, "CLR_ABORT") == 0) {
917 if (strcmp(s, "REPORT") == 0) {
922 if (strcmp(s, "CLR_REPORT") == 0) {
927 if (strcmp(s, "TIMEOUT") == 0) {
932 if (strcmp(s, "ECHO") == 0) {
937 if (strcmp(s, "SAY") == 0) {
943 * Fetch the expect and reply string.
946 expect = expect_strtok (s, "-");
949 if (expect == (char *) 0)
952 reply = expect_strtok (s, "-");
955 * Handle the expect string. If successful then exit.
957 if (get_string (expect))
961 * If there is a sub-reply string then send it. Otherwise any condition
964 if (reply == (char *) 0 || exit_code != 3)
971 * The expectation did not occur. This is terminal.
974 logf("Failed (%s)", fail_reason);
977 terminate(exit_code);
981 * Translate the input character to the appropriate string for printing
988 static char string[10];
991 meta = (c & 0x80) ? "M-" : "";
995 sprintf(string, "%s^%c", meta, (int)c + '@');
997 sprintf(string, "%s^?", meta);
999 sprintf(string, "%s%c", meta, c);
1005 * process the reply string
1010 char file_data[STR_LEN];
1015 write(2, s, strlen(s));
1022 if (strcmp(s, "OFF") == 0)
1023 signal(SIGHUP, SIG_IGN);
1025 signal(SIGHUP, sighup);
1031 echo = (strcmp(s, "ON") == 0);
1040 if (n_aborts >= MAX_ABORTS)
1041 fatal(2, "Too many ABORT strings");
1045 if (strlen(s1) > strlen(s)
1046 || strlen(s1) + 1 > sizeof(fail_buffer))
1047 fatal(1, "Illegal or too-long ABORT string ('%v')", s);
1049 abort_string[n_aborts++] = s1;
1052 logf("abort on (%v)", s);
1056 if (clear_abort_next) {
1062 clear_abort_next = 0;
1066 if (strlen(s1) > strlen(s)
1067 || strlen(s1) + 1 > sizeof(fail_buffer))
1068 fatal(1, "Illegal or too-long CLR_ABORT string ('%v')", s);
1071 for (i=0; i < n_aborts; i++) {
1072 if ( strcmp(s1,abort_string[i]) == 0 ) {
1073 free(abort_string[i]);
1074 abort_string[i] = NULL;
1078 logf("clear abort on (%v)", s);
1083 pack_array(abort_string,old_max);
1091 if (n_reports >= MAX_REPORTS)
1092 fatal(2, "Too many REPORT strings");
1096 if (strlen(s1) > strlen(s) || strlen(s1) > sizeof fail_buffer - 1)
1097 fatal(1, "Illegal or too-long REPORT string ('%v')", s);
1099 report_string[n_reports++] = s1;
1102 logf("report (%v)", s);
1106 if (clear_report_next) {
1112 clear_report_next = 0;
1116 if (strlen(s1) > strlen(s) || strlen(s1) > sizeof fail_buffer - 1)
1117 fatal(1, "Illegal or too-long REPORT string ('%v')", s);
1119 old_max = n_reports;
1120 for (i=0; i < n_reports; i++) {
1121 if ( strcmp(s1,report_string[i]) == 0 ) {
1122 free(report_string[i]);
1123 report_string[i] = NULL;
1127 logf("clear report (%v)", s);
1132 pack_array(report_string,old_max);
1142 timeout = DEFAULT_CHAT_TIMEOUT;
1145 logf("timeout set to %d seconds", timeout);
1151 * The syntax @filename means read the string to send from the
1155 /* skip the @ and any following white-space */
1157 while (*++fn == ' ' || *fn == '\t')
1164 /* open the file and read until STR_LEN-1 bytes or end-of-file */
1167 fatal(1, "%s -- open failed: %m", fn);
1168 while (n < STR_LEN - 1) {
1169 int nr = fread(&file_data[n], 1, STR_LEN - 1 - n, f);
1171 fatal(1, "%s -- read error", fn);
1178 /* use the string we got as the string to send,
1179 but trim off the final newline if any. */
1180 if (n > 0 && file_data[n-1] == '\n')
1187 if (strcmp(s, "EOT") == 0)
1189 else if (strcmp(s, "BREAK") == 0)
1201 status = read(0, &c, 1);
1205 return ((int)c & 0x7F);
1208 logf("warning: read() on stdin returned %d", status);
1211 if ((status = fcntl(0, F_GETFL, 0)) == -1)
1212 fatal(2, "Can't get file mode flags on stdin: %m");
1214 if (fcntl(0, F_SETFL, status & ~O_NONBLOCK) == -1)
1215 fatal(2, "Can't set file mode flags on stdin: %m");
1227 usleep(10000); /* inter-character typing delay (?) */
1229 status = write(1, &ch, 1);
1236 logf("warning: write() on stdout returned %d", status);
1239 if ((status = fcntl(0, F_GETFL, 0)) == -1)
1240 fatal(2, "Can't get file mode flags on stdin, %m");
1242 if (fcntl(0, F_SETFL, status & ~O_NONBLOCK) == -1)
1243 fatal(2, "Can't set file mode flags on stdin: %m");
1252 if (alarmed || put_char(c) < 0) {
1257 if (errno == EINTR || errno == EWOULDBLOCK)
1258 logf(" -- write timed out");
1260 logf(" -- write failed: %m");
1275 logf("send (??????)");
1277 logf("send (%v)", s);
1280 alarm(timeout); alarmed = 0;
1283 register char c = *s++;
1286 if (!write_char (c))
1302 usleep(10000); /* 1/100th of a second (arg is microseconds) */
1306 if (!write_char (c))
1318 * Echo a character to stderr.
1319 * When called with -1, a '\n' character is generated when
1320 * the cursor is not at the beginning of a line.
1329 case '\r': /* ignore '\r' */
1341 write(2, s, strlen(s));
1348 * 'Wait for' this string to appear on this file descriptor.
1350 int get_string(string)
1351 register char *string;
1354 int c, printed = 0, len, minlen;
1355 register char *s = temp, *end = s + STR_LEN;
1356 char *logged = temp;
1358 fail_reason = (char *)0;
1359 string = clean(string, 0);
1360 len = strlen(string);
1361 minlen = (len > sizeof(fail_buffer)? len: sizeof(fail_buffer)) - 1;
1364 logf("expect (%v)", string);
1366 if (len > STR_LEN) {
1367 logf("expect string is too long");
1381 while ( ! alarmed && (c = get_char()) >= 0) {
1382 int n, abort_len, report_len;
1386 if (verbose && c == '\n') {
1388 logf(""); /* blank line */
1390 logf("%0.*v", s - logged, logged);
1396 if (verbose && s >= logged + 80) {
1397 logf("%0.*v", s - logged, logged);
1403 fputc( '\n', stderr );
1405 fprintf( stderr, "%s", character(c) );
1408 if (!report_gathering) {
1409 for (n = 0; n < n_reports; ++n) {
1410 if ((report_string[n] != (char*) NULL) &&
1411 s - temp >= (report_len = strlen(report_string[n])) &&
1412 strncmp(s - report_len, report_string[n], report_len) == 0) {
1413 time_t time_now = time ((time_t*) NULL);
1414 struct tm* tm_now = localtime (&time_now);
1416 strftime (report_buffer, 20, "%b %d %H:%M:%S ", tm_now);
1417 strcat (report_buffer, report_string[n]);
1419 report_string[n] = (char *) NULL;
1420 report_gathering = 1;
1427 int rep_len = strlen (report_buffer);
1428 report_buffer[rep_len] = c;
1429 report_buffer[rep_len + 1] = '\0';
1432 report_gathering = 0;
1433 fprintf (report_fp, "chat: %s\n", report_buffer);
1437 if (s - temp >= len &&
1438 c == string[len - 1] &&
1439 strncmp(s - len, string, len) == 0) {
1442 logf("%0.*v", s - logged, logged);
1443 logf(" -- got it\n");
1451 for (n = 0; n < n_aborts; ++n) {
1452 if (s - temp >= (abort_len = strlen(abort_string[n])) &&
1453 strncmp(s - abort_len, abort_string[n], abort_len) == 0) {
1456 logf("%0.*v", s - logged, logged);
1463 strcpy(fail_reason = fail_buffer, abort_string[n]);
1469 if (logged < s - minlen) {
1471 logf("%0.*v", s - logged, logged);
1475 memmove(temp, s, minlen);
1476 logged = temp + (logged - s);
1480 if (alarmed && verbose)
1481 logf("warning: alarm synchronization problem");
1486 if (verbose && printed) {
1488 logf(" -- read timed out");
1490 logf(" -- read failed: %m");
1499 * Gross kludge to handle Solaris versions >= 2.6 having usleep.
1502 #include <sys/param.h>
1503 #if MAXUID > 65536 /* then this is Solaris 2.6 or later */
1509 #include <sys/types.h>
1510 #include <sys/time.h>
1513 usleep -- support routine for 4.2BSD system call emulations
1514 last edit: 29-Oct-1984 D A Gwyn
1517 extern int select();
1520 usleep( usec ) /* returns 0 if ok, else -1 */
1521 long usec; /* delay in microseconds */
1523 static struct { /* `timeval' */
1524 long tv_sec; /* seconds */
1525 long tv_usec; /* microsecs */
1526 } delay; /* _select() timeout */
1528 delay.tv_sec = usec / 1000000L;
1529 delay.tv_usec = usec % 1000000L;
1531 return select(0, (long *)0, (long *)0, (long *)0, &delay);
1536 pack_array (array, end)
1537 char **array; /* The address of the array of string pointers */
1538 int end; /* The index of the next free entry before CLR_ */
1542 for (i = 0; i < end; i++) {
1543 if (array[i] == NULL) {
1544 for (j = i+1; j < end; ++j)
1545 if (array[j] != NULL)
1546 array[i++] = array[j];
1547 for (; i < end; ++i)
1555 * vfmtmsg - format a message into a buffer. Like vsprintf except we
1556 * also specify the length of the output buffer, and we handle the
1557 * %m (error message) format.
1558 * Doesn't do floating-point formats.
1559 * Returns the number of chars put into buf.
1561 #define OUTCHAR(c) (buflen > 0? (--buflen, *buf++ = (c)): 0)
1564 vfmtmsg(buf, buflen, fmt, args)
1571 int width, prec, fillch;
1572 int base, len, neg, quoted;
1573 unsigned long val = 0;
1578 static char hexchars[] = "0123456789abcdef";
1582 while (buflen > 0) {
1583 for (f = fmt; *f != '%' && *f != 0; ++f)
1589 memcpy(buf, fmt, len);
1604 width = va_arg(args, int);
1607 while (isdigit(c)) {
1608 width = width * 10 + c - '0';
1615 prec = va_arg(args, int);
1618 while (isdigit(c)) {
1619 prec = prec * 10 + c - '0';
1630 i = va_arg(args, int);
1639 val = va_arg(args, unsigned int);
1643 val = va_arg(args, unsigned int);
1647 val = (unsigned long) va_arg(args, void *);
1652 str = va_arg(args, char *);
1655 num[0] = va_arg(args, int);
1660 str = strerror(errno);
1662 case 'v': /* "visible" string */
1663 case 'q': /* quoted string */
1665 p = va_arg(args, unsigned char *);
1666 if (fillch == '0' && prec > 0) {
1669 n = strlen((char *)p);
1670 if (prec > 0 && prec < n)
1673 while (n > 0 && buflen > 0) {
1676 if (!quoted && c >= 0x80) {
1681 if (quoted && (c == '"' || c == '\\'))
1683 if (c < 0x20 || (0x7f <= c && c < 0xa0)) {
1687 case '\t': OUTCHAR('t'); break;
1688 case '\n': OUTCHAR('n'); break;
1689 case '\b': OUTCHAR('b'); break;
1690 case '\f': OUTCHAR('f'); break;
1693 OUTCHAR(hexchars[c >> 4]);
1694 OUTCHAR(hexchars[c & 0xf]);
1711 --fmt; /* so %z outputs %z etc. */
1716 str = num + sizeof(num);
1718 while (str > num + neg) {
1719 *--str = hexchars[val % base];
1721 if (--prec <= 0 && val == 0)
1733 len = num + sizeof(num) - 1 - str;
1736 if (prec > 0 && len > prec)
1742 if ((n = width - len) > 0) {
1750 memcpy(buf, str, len);