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27 ****************************************************************************/
29 /****************************************************************************
30 * Author: Thomas E. Dickey 2008 *
31 ****************************************************************************/
34 * tabs.c -- set terminal hard-tabstops
38 #include <progs.priv.h>
39 #include <tty_settings.h>
41 MODULE_ID("$Id: tabs.c,v 1.38 2016/12/31 15:10:52 tom Exp $")
43 static void usage(void) GCC_NORETURN;
45 const char *_nc_progname;
52 ExitProgram(EXIT_FAILURE);
62 do_tabs(int *tab_list)
68 while ((stop = *tab_list++) > 0) {
70 while (last++ < stop) {
76 if (stop <= max_cols) {
77 tputs(tparm(set_tab, stop), 1, putch);
87 decode_tabs(const char *tab_list)
89 int *result = typeCalloc(int, strlen(tab_list) + (unsigned) max_cols);
96 failed("decode_tabs");
98 while ((ch = *tab_list++) != '\0') {
99 if (isdigit(UChar(ch))) {
102 } else if (ch == ',') {
103 result[n] = value + prior;
104 if (n > 0 && result[n] <= result[n - 1]) {
106 "%s: tab-stops are not in increasing order: %d %d\n",
107 _nc_progname, value, result[n - 1]);
115 } else if (ch == '+') {
117 prior = result[n - 1];
123 * If there is only one value, then it is an option such as "-8".
125 if ((n == 0) && (value > 0)) {
128 while (n < max_cols - 1) {
135 * Add the last value, if any.
137 result[n++] = value + prior;
145 print_ruler(int *tab_list)
151 /* first print a readable ruler */
152 for (n = 0; n < max_cols; n += 10) {
153 int ch = 1 + (n / 10);
155 _nc_SPRINTF(buffer, _nc_SLIMIT(sizeof(buffer))
160 printf("%.*s", ((max_cols - n) > 10) ? 10 : (max_cols - n), buffer);
164 /* now, print '*' for each stop */
165 for (n = 0, last = 0; (tab_list[n] > 0) && (last < max_cols); ++n) {
167 while (++last < stop) {
168 if (last <= max_cols) {
174 if (last <= max_cols) {
181 while (++last <= max_cols)
187 * Write an '*' on each tabstop, to demonstrate whether it lines up with the
191 write_tabs(int *tab_list)
195 while ((stop = *tab_list++) > 0 && stop <= max_cols) {
196 fputs((stop == 1) ? "*" : "\t*", stdout);
198 /* also show a tab _past_ the stops */
200 fputs("\t+", stdout);
205 * Trim leading/trailing blanks, as well as blanks after a comma.
206 * Convert embedded blanks to commas.
209 trimmed_tab_list(const char *source)
211 char *result = strdup(source);
215 for (j = k = last = 0; result[j] != 0; ++j) {
216 ch = UChar(result[j]);
220 } else if (isdigit(last) || last == ',') {
223 } else if (ch == ',') {
227 result[k++] = (char) last;
228 result[k++] = (char) ch;
238 comma_is_needed(const char *source)
243 size_t len = strlen(source);
245 result = (source[len - 1] != ',');
253 * Add a command-line parameter to the tab-list. It can be blank- or comma-
254 * separated (or a mixture). For simplicity, empty tabs are ignored, e.g.,
257 * are treated the same.
260 add_to_tab_list(char **append, const char *value)
262 char *result = *append;
263 char *copied = trimmed_tab_list(value);
265 if (copied != 0 && *copied != '\0') {
266 const char *comma = ",";
267 size_t need = 1 + strlen(copied);
271 else if (!comma_is_needed(*append))
274 need += strlen(comma);
276 need += strlen(*append);
278 result = malloc(need);
280 failed("add_to_tab_list");
284 _nc_STRCPY(result, *append, need);
287 _nc_STRCAT(result, comma, need);
288 _nc_STRCAT(result, copied, need);
297 * Check for illegal characters in the tab-list.
300 legal_tab_list(const char *tab_list)
304 if (tab_list != 0 && *tab_list != '\0') {
305 if (comma_is_needed(tab_list)) {
307 for (n = 0; tab_list[n] != '\0'; ++n) {
308 ch = UChar(tab_list[n]);
309 if (!(isdigit(ch) || ch == ',' || ch == '+')) {
311 "%s: unexpected character found '%c'\n",
318 fprintf(stderr, "%s: trailing comma found '%s'\n", _nc_progname, tab_list);
322 fprintf(stderr, "%s: no tab-list given\n", _nc_progname);
329 skip_list(char *value)
331 while (*value != '\0' &&
332 (isdigit(UChar(*value)) ||
333 isspace(UChar(*value)) ||
334 strchr("+,", UChar(*value)) != 0)) {
343 #define DATA(s) s "\n"
344 static const char msg[] =
346 DATA("Usage: tabs [options] [tabstop-list]")
349 DATA(" -0 reset tabs")
350 DATA(" -8 set tabs to standard interval")
351 DATA(" -a Assembler, IBM S/370, first format")
352 DATA(" -a2 Assembler, IBM S/370, second format")
353 DATA(" -c COBOL, normal format")
354 DATA(" -c2 COBOL compact format")
355 DATA(" -c3 COBOL compact format extended")
356 DATA(" -d debug (show ruler with expected/actual tab positions)")
358 DATA(" -n no-op (do not modify terminal settings)")
361 DATA(" -u UNIVAC 1100 Assembler")
362 DATA(" -T name use terminal type 'name'")
363 DATA(" -V print version")
365 DATA("A tabstop-list is an ordered list of column numbers, e.g., 1,11,21")
366 DATA("or 1,+10,+10 which is the same.")
372 ExitProgram(EXIT_FAILURE);
376 main(int argc, char *argv[])
378 int rc = EXIT_FAILURE;
382 NCURSES_CONST char *term_name = 0;
384 const char *tab_list = 0;
388 _nc_progname = _nc_rootname(argv[0]);
390 fd = save_tty_settings(&tty_settings);
392 if ((term_name = getenv("TERM")) == 0)
393 term_name = "ansi+tabs";
395 /* cannot use getopt, since some options are two-character */
396 for (n = 1; n < argc; ++n) {
397 char *option = argv[n];
400 while ((ch = *++option) != '\0') {
406 tab_list = "1,10,16,36,72";
408 /* Assembler, IBM S/370, first format */
411 tab_list = "1,10,16,40,72";
412 /* Assembler, IBM S/370, second format */
420 tab_list = "1,8,12,16,20,55";
422 /* COBOL, normal format */
425 tab_list = "1,6,10,14,49";
426 /* COBOL compact format */
429 tab_list = "1,6,10,14,18,22,26,30,34,38,42,46,50,54,58,62,67";
430 /* COBOL compact format extended */
434 case 'd': /* ncurses extension */
438 tab_list = "1,7,11,15,19,23";
441 case 'n': /* ncurses extension */
445 tab_list = "1,5,9,13,17,21,25,29,33,37,41,45,49,53,57,61";
449 tab_list = "1,10,55";
453 tab_list = "1,12,20,44";
454 /* UNIVAC 1100 Assembler */
458 if (*++option != '\0') {
461 term_name = argv[n++];
464 option += ((int) strlen(option)) - 1;
467 puts(curses_version());
468 ExitProgram(EXIT_SUCCESS);
470 if (isdigit(UChar(*option))) {
471 char *copy = strdup(option);
472 *skip_list(copy) = '\0';
474 option = skip_list(option) - 1;
483 while ((ch = *++option) != '\0') {
487 * The "+mXXX" option is unimplemented because only the long-obsolete
488 * att510d implements smgl, which is needed to support
493 /* special case of relative stops separated by spaces? */
494 if (option == argv[n] + 1) {
495 tab_list = add_to_tab_list(&append, argv[n]);
503 if (tab_list != (const char *) append) {
504 /* one of the predefined options was used */
509 tab_list = add_to_tab_list(&append, option);
514 setupterm(term_name, fd, (int *) 0);
516 max_cols = (columns > 0) ? columns : 80;
518 if (!VALID_STRING(clear_all_tabs)) {
520 "%s: terminal type '%s' cannot reset tabs\n",
521 _nc_progname, term_name);
522 } else if (!VALID_STRING(set_tab)) {
524 "%s: terminal type '%s' cannot set tabs\n",
525 _nc_progname, term_name);
526 } else if (legal_tab_list(tab_list)) {
527 int *list = decode_tabs(tab_list);
530 tputs(clear_all_tabs, 1, putch);
537 printf("tabs %s\n", tab_list);
544 printf("tabs %s\n", tab_list);