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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>
40 MODULE_ID("$Id: tabs.c,v 1.23 2012/02/22 23:57:44 tom Exp $")
42 static void usage(void) GCC_NORETURN;
53 do_tabs(int *tab_list)
59 while ((stop = *tab_list++) > 0) {
61 while (last++ < stop) {
67 if (stop <= max_cols) {
68 tputs(tparm(set_tab, stop), 1, putch);
78 decode_tabs(const char *tab_list)
80 int *result = typeCalloc(int, strlen(tab_list) + (unsigned) max_cols);
87 while ((ch = *tab_list++) != '\0') {
88 if (isdigit(UChar(ch))) {
91 } else if (ch == ',') {
92 result[n] = value + prior;
93 if (n > 0 && result[n] <= result[n - 1]) {
95 "tab-stops are not in increasing order: %d %d\n",
96 value, result[n - 1]);
104 } else if (ch == '+') {
106 prior = result[n - 1];
113 * If there is only one value, then it is an option such as "-8".
115 if ((n == 0) && (value > 0)) {
117 while (n < max_cols - 1) {
124 * Add the last value, if any.
126 result[n++] = value + prior;
133 print_ruler(int *tab_list)
139 /* first print a readable ruler */
140 for (n = 0; n < max_cols; n += 10) {
141 int ch = 1 + (n / 10);
143 _nc_SPRINTF(buffer, _nc_SLIMIT(sizeof(buffer))
148 printf("%.*s", ((max_cols - n) > 10) ? 10 : (max_cols - n), buffer);
152 /* now, print '*' for each stop */
153 for (n = 0, last = 0; (tab_list[n] > 0) && (last < max_cols); ++n) {
155 while (++last < stop) {
156 if (last <= max_cols) {
162 if (last <= max_cols) {
169 while (++last <= max_cols)
175 * Write an '*' on each tabstop, to demonstrate whether it lines up with the
179 write_tabs(int *tab_list)
183 while ((stop = *tab_list++) > 0 && stop <= max_cols) {
184 fputs((stop == 1) ? "*" : "\t*", stdout);
186 /* also show a tab _past_ the stops */
188 fputs("\t+", stdout);
193 * Trim leading/trailing blanks, as well as blanks after a comma.
194 * Convert embedded blanks to commas.
197 trimmed_tab_list(const char *source)
199 char *result = strdup(source);
203 for (j = k = last = 0; result[j] != 0; ++j) {
204 ch = UChar(result[j]);
208 } else if (isdigit(last) || last == ',') {
211 } else if (ch == ',') {
215 result[k++] = (char) last;
216 result[k++] = (char) ch;
226 comma_is_needed(const char *source)
231 size_t len = strlen(source);
233 result = (source[len - 1] != ',');
241 * Add a command-line parameter to the tab-list. It can be blank- or comma-
242 * separated (or a mixture). For simplicity, empty tabs are ignored, e.g.,
245 * are treated the same.
248 add_to_tab_list(char **append, const char *value)
250 char *result = *append;
251 char *copied = trimmed_tab_list(value);
253 if (copied != 0 && *copied != '\0') {
254 const char *comma = ",";
255 size_t need = 1 + strlen(copied);
259 else if (!comma_is_needed(*append))
262 need += strlen(comma);
264 need += strlen(*append);
266 result = malloc(need);
270 _nc_STRCPY(result, *append, need);
273 _nc_STRCAT(result, comma, need);
274 _nc_STRCAT(result, copied, need);
283 * Check for illegal characters in the tab-list.
286 legal_tab_list(const char *program, const char *tab_list)
290 if (tab_list != 0 && *tab_list != '\0') {
291 if (comma_is_needed(tab_list)) {
293 for (n = 0; tab_list[n] != '\0'; ++n) {
294 ch = UChar(tab_list[n]);
295 if (!(isdigit(ch) || ch == ',' || ch == '+')) {
297 "%s: unexpected character found '%c'\n",
304 fprintf(stderr, "%s: trailing comma found '%s'\n", program, tab_list);
308 fprintf(stderr, "%s: no tab-list given\n", program);
317 static const char *msg[] =
319 "Usage: tabs [options] [tabstop-list]"
323 ," -8 set tabs to standard interval"
324 ," -a Assembler, IBM S/370, first format"
325 ," -a2 Assembler, IBM S/370, second format"
326 ," -c COBOL, normal format"
327 ," -c2 COBOL compact format"
328 ," -c3 COBOL compact format extended"
329 ," -d debug (show ruler with expected/actual tab positions)"
331 ," -n no-op (do not modify terminal settings)"
334 ," -u UNIVAC 1100 Assembler"
335 ," -T name use terminal type 'name'"
337 ,"A tabstop-list is an ordered list of column numbers, e.g., 1,11,21"
338 ,"or 1,+10,+10 which is the same."
343 for (n = 0; n < SIZEOF(msg); ++n) {
344 fprintf(stderr, "%s\n", msg[n]);
346 ExitProgram(EXIT_FAILURE);
350 main(int argc, char *argv[])
352 int rc = EXIT_FAILURE;
356 NCURSES_CONST char *term_name = 0;
358 const char *tab_list = 0;
360 if ((term_name = getenv("TERM")) == 0)
361 term_name = "ansi+tabs";
363 /* cannot use getopt, since some options are two-character */
364 for (n = 1; n < argc; ++n) {
365 char *option = argv[n];
368 while ((ch = *++option) != '\0') {
373 tab_list = "1,10,16,36,72";
374 /* Assembler, IBM S/370, first format */
377 tab_list = "1,10,16,40,72";
378 /* Assembler, IBM S/370, second format */
387 tab_list = "1,8,12,16,20,55";
388 /* COBOL, normal format */
391 tab_list = "1,6,10,14,49";
392 /* COBOL compact format */
395 tab_list = "1,6,10,14,18,22,26,30,34,38,42,46,50,54,58,62,67";
396 /* COBOL compact format extended */
402 case 'd': /* ncurses extension */
406 tab_list = "1,7,11,15,19,23";
409 case 'n': /* ncurses extension */
413 tab_list = "1,5,9,13,17,21,25,29,33,37,41,45,49,53,57,61";
417 tab_list = "1,10,55";
421 tab_list = "1,12,20,44";
422 /* UNIVAC 1100 Assembler */
426 if (*++option != '\0') {
429 term_name = argv[n++];
431 option += ((int) strlen(option)) - 1;
434 if (isdigit(UChar(*option))) {
440 option += ((int) strlen(option)) - 1;
446 while ((ch = *++option) != '\0') {
450 * The "+mXXX" option is unimplemented because only the long-obsolete
451 * att510d implements smgl, which is needed to support
456 /* special case of relative stops separated by spaces? */
457 if (option == argv[n] + 1) {
458 tab_list = add_to_tab_list(&append, argv[n]);
466 if (tab_list != (const char *) append) {
467 /* one of the predefined options was used */
472 tab_list = add_to_tab_list(&append, option);
477 setupterm(term_name, STDOUT_FILENO, (int *) 0);
479 max_cols = (columns > 0) ? columns : 80;
481 if (!VALID_STRING(clear_all_tabs)) {
483 "%s: terminal type '%s' cannot reset tabs\n",
485 } else if (!VALID_STRING(set_tab)) {
487 "%s: terminal type '%s' cannot set tabs\n",
489 } else if (legal_tab_list(argv[0], tab_list)) {
490 int *list = decode_tabs(tab_list);
493 tputs(clear_all_tabs, 1, putch);
500 printf("tabs %s\n", tab_list);
507 printf("tabs %s\n", tab_list);