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+/****************************************************************************
+ * Copyright (c) 2008-2009,2010 Free Software Foundation, Inc. *
+ * *
+ * Permission is hereby granted, free of charge, to any person obtaining a *
+ * copy of this software and associated documentation files (the *
+ * "Software"), to deal in the Software without restriction, including *
+ * without limitation the rights to use, copy, modify, merge, publish, *
+ * distribute, distribute with modifications, sublicense, and/or sell *
+ * copies of the Software, and to permit persons to whom the Software is *
+ * furnished to do so, subject to the following conditions: *
+ * *
+ * The above copyright notice and this permission notice shall be included *
+ * in all copies or substantial portions of the Software. *
+ * *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
+ * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
+ * THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
+ * *
+ * Except as contained in this notice, the name(s) of the above copyright *
+ * holders shall not be used in advertising or otherwise to promote the *
+ * sale, use or other dealings in this Software without prior written *
+ * authorization. *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Author: Thomas E. Dickey 2008 *
+ ****************************************************************************/
+
+/*
+ * tabs.c -- set terminal hard-tabstops
+ */
+
+#define USE_LIBTINFO
+#include <progs.priv.h>
+
+MODULE_ID("$Id: tabs.c,v 1.19 2010/10/23 22:26:01 tom Exp $")
+
+static void usage(void) GCC_NORETURN;
+
+static int max_cols;
+
+static int
+putch(int c)
+{
+ return putchar(c);
+}
+
+static void
+do_tabs(int *tab_list)
+{
+ int last = 1;
+ int stop;
+
+ putchar('\r');
+ while ((stop = *tab_list++) > 0) {
+ if (last < stop) {
+ while (last++ < stop) {
+ if (last > max_cols)
+ break;
+ putchar(' ');
+ }
+ }
+ if (stop <= max_cols) {
+ tputs(tparm(set_tab, stop), 1, putch);
+ last = stop;
+ } else {
+ break;
+ }
+ }
+ putchar('\n');
+}
+
+static int *
+decode_tabs(const char *tab_list)
+{
+ int *result = typeCalloc(int, strlen(tab_list) + (unsigned) max_cols);
+ int n = 0;
+ int value = 0;
+ int prior = 0;
+ int ch;
+
+ if (result != 0) {
+ while ((ch = *tab_list++) != '\0') {
+ if (isdigit(UChar(ch))) {
+ value *= 10;
+ value += (ch - '0');
+ } else if (ch == ',') {
+ result[n] = value + prior;
+ if (n > 0 && result[n] <= result[n - 1]) {
+ fprintf(stderr,
+ "tab-stops are not in increasing order: %d %d\n",
+ value, result[n - 1]);
+ free(result);
+ result = 0;
+ break;
+ }
+ ++n;
+ value = 0;
+ prior = 0;
+ } else if (ch == '+') {
+ if (n)
+ prior = result[n - 1];
+ }
+ }
+ }
+
+ if (result != 0) {
+ /*
+ * If there is only one value, then it is an option such as "-8".
+ */
+ if ((n == 0) && (value > 0)) {
+ int step = value;
+ while (n < max_cols - 1) {
+ result[n++] = value;
+ value += step;
+ }
+ }
+
+ /*
+ * Add the last value, if any.
+ */
+ result[n++] = value + prior;
+ result[n] = 0;
+ }
+ return result;
+}
+
+static void
+print_ruler(int *tab_list)
+{
+ int last = 0;
+ int stop;
+ int n;
+
+ /* first print a readable ruler */
+ for (n = 0; n < max_cols; n += 10) {
+ int ch = 1 + (n / 10);
+ char buffer[20];
+ sprintf(buffer, "----+----%c",
+ ((ch < 10)
+ ? (ch + '0')
+ : (ch + 'A' - 10)));
+ printf("%.*s", ((max_cols - n) > 10) ? 10 : (max_cols - n), buffer);
+ }
+ putchar('\n');
+
+ /* now, print '*' for each stop */
+ for (n = 0, last = 0; (tab_list[n] > 0) && (last < max_cols); ++n) {
+ stop = tab_list[n];
+ while (++last < stop) {
+ if (last <= max_cols) {
+ putchar('-');
+ } else {
+ break;
+ }
+ }
+ if (last <= max_cols) {
+ putchar('*');
+ last = stop;
+ } else {
+ break;
+ }
+ }
+ while (++last <= max_cols)
+ putchar('-');
+ putchar('\n');
+}
+
+/*
+ * Write an '*' on each tabstop, to demonstrate whether it lines up with the
+ * ruler.
+ */
+static void
+write_tabs(int *tab_list)
+{
+ int stop;
+
+ while ((stop = *tab_list++) > 0 && stop <= max_cols) {
+ fputs((stop == 1) ? "*" : "\t*", stdout);
+ };
+ /* also show a tab _past_ the stops */
+ if (stop < max_cols)
+ fputs("\t+", stdout);
+ putchar('\n');
+}
+
+/*
+ * Trim leading/trailing blanks, as well as blanks after a comma.
+ * Convert embedded blanks to commas.
+ */
+static char *
+trimmed_tab_list(const char *source)
+{
+ char *result = strdup(source);
+ int ch, j, k, last;
+
+ if (result != 0) {
+ for (j = k = last = 0; result[j] != 0; ++j) {
+ ch = UChar(result[j]);
+ if (isspace(ch)) {
+ if (last == '\0') {
+ continue;
+ } else if (isdigit(last) || last == ',') {
+ ch = ',';
+ }
+ } else if (ch == ',') {
+ ;
+ } else {
+ if (last == ',')
+ result[k++] = (char) last;
+ result[k++] = (char) ch;
+ }
+ last = ch;
+ }
+ result[k] = '\0';
+ }
+ return result;
+}
+
+static bool
+comma_is_needed(const char *source)
+{
+ bool result = FALSE;
+
+ if (source != 0) {
+ unsigned len = strlen(source);
+ if (len != 0)
+ result = (source[len - 1] != ',');
+ } else {
+ result = FALSE;
+ }
+ return result;
+}
+
+/*
+ * Add a command-line parameter to the tab-list. It can be blank- or comma-
+ * separated (or a mixture). For simplicity, empty tabs are ignored, e.g.,
+ * tabs 1,,6,11
+ * tabs 1,6,11
+ * are treated the same.
+ */
+static const char *
+add_to_tab_list(char **append, const char *value)
+{
+ char *result = *append;
+ char *copied = trimmed_tab_list(value);
+
+ if (copied != 0 && *copied != '\0') {
+ const char *comma = ",";
+ unsigned need = 1 + strlen(copied);
+
+ if (*copied == ',')
+ comma = "";
+ else if (!comma_is_needed(*append))
+ comma = "";
+
+ need += strlen(comma);
+ if (*append != 0)
+ need += strlen(*append);
+
+ result = malloc(need);
+ if (result != 0) {
+ *result = '\0';
+ if (*append != 0) {
+ strcpy(result, *append);
+ free(*append);
+ }
+ strcat(result, comma);
+ strcat(result, copied);
+ }
+
+ *append = result;
+ }
+ return result;
+}
+
+/*
+ * Check for illegal characters in the tab-list.
+ */
+static bool
+legal_tab_list(const char *program, const char *tab_list)
+{
+ bool result = TRUE;
+
+ if (tab_list != 0 && *tab_list != '\0') {
+ if (comma_is_needed(tab_list)) {
+ int n, ch;
+ for (n = 0; tab_list[n] != '\0'; ++n) {
+ ch = UChar(tab_list[n]);
+ if (!(isdigit(ch) || ch == ',' || ch == '+')) {
+ fprintf(stderr,
+ "%s: unexpected character found '%c'\n",
+ program, ch);
+ result = FALSE;
+ break;
+ }
+ }
+ } else {
+ fprintf(stderr, "%s: trailing comma found '%s'\n", program, tab_list);
+ result = FALSE;
+ }
+ } else {
+ fprintf(stderr, "%s: no tab-list given\n", program);
+ result = FALSE;
+ }
+ return result;
+}
+
+static void
+usage(void)
+{
+ static const char *msg[] =
+ {
+ "Usage: tabs [options] [tabstop-list]"
+ ,""
+ ,"Options:"
+ ," -0 reset tabs"
+ ," -8 set tabs to standard interval"
+ ," -a Assembler, IBM S/370, first format"
+ ," -a2 Assembler, IBM S/370, second format"
+ ," -c COBOL, normal format"
+ ," -c2 COBOL compact format"
+ ," -c3 COBOL compact format extended"
+ ," -d debug (show ruler with expected/actual tab positions)"
+ ," -f FORTRAN"
+ ," -n no-op (do not modify terminal settings)"
+ ," -p PL/I"
+ ," -s SNOBOL"
+ ," -u UNIVAC 1100 Assembler"
+ ," -T name use terminal type 'name'"
+ ,""
+ ,"A tabstop-list is an ordered list of column numbers, e.g., 1,11,21"
+ ,"or 1,+10,+10 which is the same."
+ };
+ unsigned n;
+
+ fflush(stdout);
+ for (n = 0; n < SIZEOF(msg); ++n) {
+ fprintf(stderr, "%s\n", msg[n]);
+ }
+ ExitProgram(EXIT_FAILURE);
+}
+
+int
+main(int argc, char *argv[])
+{
+ int rc = EXIT_FAILURE;
+ bool debug = FALSE;
+ bool no_op = FALSE;
+ int n, ch;
+ NCURSES_CONST char *term_name = 0;
+ const char *mar_list = 0; /* ignored */
+ char *append = 0;
+ const char *tab_list = 0;
+
+ if ((term_name = getenv("TERM")) == 0)
+ term_name = "ansi+tabs";
+
+ /* cannot use getopt, since some options are two-character */
+ for (n = 1; n < argc; ++n) {
+ char *option = argv[n];
+ switch (option[0]) {
+ case '-':
+ while ((ch = *++option) != '\0') {
+ switch (ch) {
+ case 'a':
+ switch (*option) {
+ case '\0':
+ tab_list = "1,10,16,36,72";
+ /* Assembler, IBM S/370, first format */
+ break;
+ case '2':
+ tab_list = "1,10,16,40,72";
+ /* Assembler, IBM S/370, second format */
+ break;
+ default:
+ usage();
+ }
+ break;
+ case 'c':
+ switch (*option) {
+ case '\0':
+ tab_list = "1,8,12,16,20,55";
+ /* COBOL, normal format */
+ break;
+ case '2':
+ tab_list = "1,6,10,14,49";
+ /* COBOL compact format */
+ break;
+ case '3':
+ tab_list = "1,6,10,14,18,22,26,30,34,38,42,46,50,54,58,62,67";
+ /* COBOL compact format extended */
+ break;
+ default:
+ usage();
+ }
+ break;
+ case 'd': /* ncurses extension */
+ debug = TRUE;
+ break;
+ case 'f':
+ tab_list = "1,7,11,15,19,23";
+ /* FORTRAN */
+ break;
+ case 'n': /* ncurses extension */
+ no_op = TRUE;
+ break;
+ case 'p':
+ tab_list = "1,5,9,13,17,21,25,29,33,37,41,45,49,53,57,61";
+ /* PL/I */
+ break;
+ case 's':
+ tab_list = "1,10,55";
+ /* SNOBOL */
+ break;
+ case 'u':
+ tab_list = "1,12,20,44";
+ /* UNIVAC 1100 Assembler */
+ break;
+ case 'T':
+ ++n;
+ if (*++option != '\0') {
+ term_name = option;
+ } else {
+ term_name = argv[n++];
+ }
+ option += ((int) strlen(option)) - 1;
+ continue;
+ default:
+ if (isdigit(UChar(*option))) {
+ tab_list = option;
+ ++n;
+ } else {
+ usage();
+ }
+ option += ((int) strlen(option)) - 1;
+ break;
+ }
+ }
+ break;
+ case '+':
+ while ((ch = *++option) != '\0') {
+ switch (ch) {
+ case 'm':
+ mar_list = option;
+ break;
+ default:
+ /* special case of relative stops separated by spaces? */
+ if (option == argv[n] + 1) {
+ tab_list = add_to_tab_list(&append, argv[n]);
+ }
+ break;
+ }
+ }
+ break;
+ default:
+ if (append != 0) {
+ if (tab_list != (const char *) append) {
+ /* one of the predefined options was used */
+ free(append);
+ append = 0;
+ }
+ }
+ tab_list = add_to_tab_list(&append, option);
+ break;
+ }
+ }
+
+ setupterm(term_name, STDOUT_FILENO, (int *) 0);
+
+ max_cols = (columns > 0) ? columns : 80;
+
+ if (!VALID_STRING(clear_all_tabs)) {
+ fprintf(stderr,
+ "%s: terminal type '%s' cannot reset tabs\n",
+ argv[0], term_name);
+ } else if (!VALID_STRING(set_tab)) {
+ fprintf(stderr,
+ "%s: terminal type '%s' cannot set tabs\n",
+ argv[0], term_name);
+ } else if (legal_tab_list(argv[0], tab_list)) {
+ int *list = decode_tabs(tab_list);
+
+ if (!no_op)
+ tputs(clear_all_tabs, 1, putch);
+
+ if (list != 0) {
+ if (!no_op)
+ do_tabs(list);
+ if (debug) {
+ fflush(stderr);
+ printf("tabs %s\n", tab_list);
+ print_ruler(list);
+ write_tabs(list);
+ }
+ free(list);
+ } else if (debug) {
+ fflush(stderr);
+ printf("tabs %s\n", tab_list);
+ }
+ rc = EXIT_SUCCESS;
+ }
+ if (append != 0)
+ free(append);
+ ExitProgram(rc);
+}
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