source: fmtext.c @ d3c318b

release-1.8release-1.9
Last change on this file since d3c318b was d3c318b, checked in by David Benjamin <davidben@mit.edu>, 10 years ago
Don't stick random NULs when waddnstr exists
  • Property mode set to 100644
File size: 28.9 KB
Line 
1#include "owl.h"
2#include <stdlib.h>
3#include <string.h>
4
5/* initialize an fmtext with no data */
6void owl_fmtext_init_null(owl_fmtext *f)
7{
8  f->textlen = 0;
9  f->bufflen = 5;
10  f->textbuff = owl_malloc(5);
11  f->textbuff[0] = 0;
12  f->default_attrs = OWL_FMTEXT_ATTR_NONE;
13  f->default_fgcolor = OWL_COLOR_DEFAULT;
14  f->default_bgcolor = OWL_COLOR_DEFAULT;
15}
16
17/* Clear the data from an fmtext, but don't deallocate memory. This
18   fmtext can then be appended to again. */
19void owl_fmtext_clear(owl_fmtext *f)
20{
21  f->textlen = 0;
22  f->textbuff[0] = 0;
23  f->default_attrs = OWL_FMTEXT_ATTR_NONE;
24  f->default_fgcolor = OWL_COLOR_DEFAULT;
25  f->default_bgcolor = OWL_COLOR_DEFAULT;
26}
27
28static void _owl_fmtext_realloc(owl_fmtext *f, int newlen)
29{
30    if(newlen + 1 > f->bufflen) {
31      f->textbuff = owl_realloc(f->textbuff, newlen + 1);
32      f->bufflen = newlen+1;
33  }
34}
35
36int owl_fmtext_is_format_char(gunichar c)
37{
38  if ((c & ~OWL_FMTEXT_UC_ATTR_MASK) == OWL_FMTEXT_UC_ATTR) return 1;
39  if ((c & ~(OWL_FMTEXT_UC_ALLCOLOR_MASK)) == OWL_FMTEXT_UC_COLOR_BASE) return 1;
40  return 0;
41}
42/* append text to the end of 'f' with attribute 'attr' and color
43 * 'color'
44 */
45void owl_fmtext_append_attr(owl_fmtext *f, const char *text, char attr, short fgcolor, short bgcolor)
46{
47  char attrbuff[6];
48  int newlen, a = 0, fg = 0, bg = 0;
49 
50  if (attr != OWL_FMTEXT_ATTR_NONE) a=1;
51  if (fgcolor != OWL_COLOR_DEFAULT) fg=1;
52  if (bgcolor != OWL_COLOR_DEFAULT) bg=1;
53
54  /* Plane-16 characters in UTF-8 are 4 bytes long. */
55  newlen = strlen(f->textbuff) + strlen(text) + (8 * (a + fg + bg));
56  _owl_fmtext_realloc(f, newlen);
57
58  /* Set attributes */
59  if (a)
60    strncat(f->textbuff, attrbuff,
61            g_unichar_to_utf8(OWL_FMTEXT_UC_ATTR | attr, attrbuff));
62  if (fg)
63    strncat(f->textbuff, attrbuff,
64            g_unichar_to_utf8(OWL_FMTEXT_UC_FGCOLOR | fgcolor, attrbuff));
65  if (bg)
66    strncat(f->textbuff, attrbuff,
67            g_unichar_to_utf8(OWL_FMTEXT_UC_BGCOLOR | bgcolor, attrbuff));
68 
69  strcat(f->textbuff, text);
70
71  /* Reset attributes */
72  if (bg) strcat(f->textbuff, OWL_FMTEXT_UTF8_BGDEFAULT);
73  if (fg) strcat(f->textbuff, OWL_FMTEXT_UTF8_FGDEFAULT);
74  if (a)  strcat(f->textbuff, OWL_FMTEXT_UTF8_ATTR_NONE);
75  f->textlen=newlen;
76}
77
78/* Append normal, uncolored text 'text' to 'f' */
79void owl_fmtext_append_normal(owl_fmtext *f, const char *text)
80{
81  owl_fmtext_append_attr(f, text, OWL_FMTEXT_ATTR_NONE, OWL_COLOR_DEFAULT, OWL_COLOR_DEFAULT);
82}
83
84/* Append normal, uncolored text specified by format string to 'f' */
85void owl_fmtext_appendf_normal(owl_fmtext *f, const char *fmt, ...)
86{
87  va_list ap;
88  char *buff;
89
90  va_start(ap, fmt);
91  buff = g_strdup_vprintf(fmt, ap);
92  va_end(ap);
93  if (!buff)
94    return;
95  owl_fmtext_append_attr(f, buff, OWL_FMTEXT_ATTR_NONE, OWL_COLOR_DEFAULT, OWL_COLOR_DEFAULT);
96  owl_free(buff);
97}
98
99/* Append normal text 'text' to 'f' with color 'color' */
100void owl_fmtext_append_normal_color(owl_fmtext *f, const char *text, int fgcolor, int bgcolor)
101{
102  owl_fmtext_append_attr(f, text, OWL_FMTEXT_ATTR_NONE, fgcolor, bgcolor);
103}
104
105/* Append bold text 'text' to 'f' */
106void owl_fmtext_append_bold(owl_fmtext *f, const char *text)
107{
108  owl_fmtext_append_attr(f, text, OWL_FMTEXT_ATTR_BOLD, OWL_COLOR_DEFAULT, OWL_COLOR_DEFAULT);
109}
110
111/* Append reverse video text 'text' to 'f' */
112void owl_fmtext_append_reverse(owl_fmtext *f, const char *text)
113{
114  owl_fmtext_append_attr(f, text, OWL_FMTEXT_ATTR_REVERSE, OWL_COLOR_DEFAULT, OWL_COLOR_DEFAULT);
115}
116
117/* Append reversed and bold, uncolored text 'text' to 'f' */
118void owl_fmtext_append_reversebold(owl_fmtext *f, const char *text)
119{
120  owl_fmtext_append_attr(f, text, OWL_FMTEXT_ATTR_REVERSE | OWL_FMTEXT_ATTR_BOLD, OWL_COLOR_DEFAULT, OWL_COLOR_DEFAULT);
121}
122
123/* Add the attribute 'attr' to the default atts for the text in 'f' */
124void owl_fmtext_addattr(owl_fmtext *f, char attr)
125{
126  /* add the attribute to all text */
127  f->default_attrs |= attr;
128}
129
130/* Set the default foreground color for this fmtext to 'color'.
131 * Only affects text that is colored default.
132 */
133void owl_fmtext_colorize(owl_fmtext *f, int color)
134{
135  f->default_fgcolor = color;
136}
137
138/* Set the default foreground color for this fmtext to 'color'.
139 * Only affects text that is colored default.
140 */
141void owl_fmtext_colorizebg(owl_fmtext *f, int color)
142{
143  f->default_bgcolor = color;
144}
145
146/* Internal function. Parse attrbute character. */
147static void _owl_fmtext_update_attributes(gunichar c, char *attr, short *fgcolor, short *bgcolor)
148{
149  if ((c & OWL_FMTEXT_UC_ATTR) == OWL_FMTEXT_UC_ATTR) {
150    *attr = c & OWL_FMTEXT_UC_ATTR_MASK;
151  }
152  else if ((c & OWL_FMTEXT_UC_COLOR_BASE) == OWL_FMTEXT_UC_COLOR_BASE) {
153    if ((c & OWL_FMTEXT_UC_BGCOLOR) == OWL_FMTEXT_UC_BGCOLOR) {
154      *bgcolor = (c == OWL_FMTEXT_UC_BGDEFAULT
155                  ? OWL_COLOR_DEFAULT
156                  : c & OWL_FMTEXT_UC_COLOR_MASK);
157    }
158    else if ((c & OWL_FMTEXT_UC_FGCOLOR) == OWL_FMTEXT_UC_FGCOLOR) {
159      *fgcolor = (c == OWL_FMTEXT_UC_FGDEFAULT
160                  ? OWL_COLOR_DEFAULT
161                  : c & OWL_FMTEXT_UC_COLOR_MASK);
162    }
163  }
164}
165
166/* Internal function. Scan for attribute characters. */
167static void _owl_fmtext_scan_attributes(const owl_fmtext *f, int start, char *attr, short *fgcolor, short *bgcolor)
168{
169  const char *p;
170  p = strchr(f->textbuff, OWL_FMTEXT_UC_STARTBYTE_UTF8);
171  while (p && p < f->textbuff + start) {
172    _owl_fmtext_update_attributes(g_utf8_get_char(p), attr, fgcolor, bgcolor);
173    p = strchr(p+1, OWL_FMTEXT_UC_STARTBYTE_UTF8);
174  }
175} 
176
177/* Internal function.  Append text from 'in' between index 'start'
178 * inclusive and 'stop' exclusive, to the end of 'f'. This function
179 * works with bytes.
180 */
181static void _owl_fmtext_append_fmtext(owl_fmtext *f, const owl_fmtext *in, int start, int stop)
182{
183  char attrbuff[6];
184  int newlen, a = 0, fg = 0, bg = 0;
185  char attr = 0;
186  short fgcolor = OWL_COLOR_DEFAULT;
187  short bgcolor = OWL_COLOR_DEFAULT;
188
189  _owl_fmtext_scan_attributes(in, start, &attr, &fgcolor, &bgcolor);
190  if (attr != OWL_FMTEXT_ATTR_NONE) a=1;
191  if (fgcolor != OWL_COLOR_DEFAULT) fg=1;
192  if (bgcolor != OWL_COLOR_DEFAULT) bg=1;
193
194  /* We will reset to defaults after appending the text. We may need
195     to set initial attributes. */
196  newlen=strlen(f->textbuff)+(stop-start) + (4 * (a + fg + bg)) + 12;
197  _owl_fmtext_realloc(f, newlen);
198
199  if (a)
200    strncat(f->textbuff, attrbuff,
201            g_unichar_to_utf8(OWL_FMTEXT_UC_ATTR | attr, attrbuff));
202  if (fg)
203    strncat(f->textbuff, attrbuff,
204            g_unichar_to_utf8(OWL_FMTEXT_UC_FGCOLOR | fgcolor, attrbuff));
205  if (bg)
206    strncat(f->textbuff, attrbuff,
207            g_unichar_to_utf8(OWL_FMTEXT_UC_BGCOLOR | bgcolor, attrbuff));
208
209  strncat(f->textbuff, in->textbuff+start, stop-start);
210
211  /* Reset attributes */
212  strcat(f->textbuff, OWL_FMTEXT_UTF8_BGDEFAULT);
213  strcat(f->textbuff, OWL_FMTEXT_UTF8_FGDEFAULT);
214  strcat(f->textbuff, OWL_FMTEXT_UTF8_ATTR_NONE);
215
216  f->textbuff[newlen]='\0';
217  f->textlen=newlen;
218}
219
220/* append fmtext 'in' to 'f' */
221void owl_fmtext_append_fmtext(owl_fmtext *f, const owl_fmtext *in)
222{
223  _owl_fmtext_append_fmtext(f, in, 0, in->textlen);
224
225}
226
227/* Append 'nspaces' number of spaces to the end of 'f' */
228void owl_fmtext_append_spaces(owl_fmtext *f, int nspaces)
229{
230  int i;
231  for (i=0; i<nspaces; i++) {
232    owl_fmtext_append_normal(f, " ");
233  }
234}
235
236/* Return a plain version of the fmtext.  Caller is responsible for
237 * freeing the return
238 */
239char *owl_fmtext_print_plain(const owl_fmtext *f)
240{
241  return owl_strip_format_chars(f->textbuff);
242}
243
244static void _owl_fmtext_wattrset(WINDOW *w, int attrs)
245{
246  wattrset(w, A_NORMAL);
247  if (attrs & OWL_FMTEXT_ATTR_BOLD) wattron(w, A_BOLD);
248  if (attrs & OWL_FMTEXT_ATTR_REVERSE) wattron(w, A_REVERSE);
249  if (attrs & OWL_FMTEXT_ATTR_UNDERLINE) wattron(w, A_UNDERLINE);
250}
251
252static void _owl_fmtext_update_colorpair(short fg, short bg, short *pair)
253{
254  if (owl_global_get_hascolors(&g)) {
255    *pair = owl_fmtext_get_colorpair(fg, bg);
256  }
257}
258
259static void _owl_fmtext_wcolor_set(WINDOW *w, short pair)
260{
261  if (owl_global_get_hascolors(&g)) {
262      wcolor_set(w,pair,NULL);
263      wbkgdset(w, COLOR_PAIR(pair));
264  }
265}
266
267/* add the formatted text to the curses window 'w'.  The window 'w'
268 * must already be initiatlized with curses
269 */
270static void _owl_fmtext_curs_waddstr(const owl_fmtext *f, WINDOW *w, int do_search)
271{
272  /* char *tmpbuff; */
273  /* int position, trans1, trans2, trans3, len, lastsame; */
274  char *s, *p;
275  char attr;
276  short fg, bg, pair = 0;
277 
278  if (w==NULL) {
279    owl_function_debugmsg("Hit a null window in owl_fmtext_curs_waddstr.");
280    return;
281  }
282
283  s = f->textbuff;
284  /* Set default attributes. */
285  attr = f->default_attrs;
286  fg = f->default_fgcolor;
287  bg = f->default_bgcolor;
288  _owl_fmtext_wattrset(w, attr);
289  _owl_fmtext_update_colorpair(fg, bg, &pair);
290  _owl_fmtext_wcolor_set(w, pair);
291
292  /* Find next possible format character. */
293  p = strchr(s, OWL_FMTEXT_UC_STARTBYTE_UTF8);
294  while(p) {
295    if (owl_fmtext_is_format_char(g_utf8_get_char(p))) {
296      /* Deal with all text from last insert to here. */
297      char tmp;
298   
299      tmp = p[0];
300      p[0] = '\0';
301      if (do_search && owl_global_is_search_active(&g)) {
302        /* Search is active, so highlight search results. */
303        int start, end;
304        while (owl_regex_compare(owl_global_get_search_re(&g), s, &start, &end) == 0) {
305          /* Prevent an infinite loop matching the empty string. */
306          if (end == 0)
307            break;
308
309          /* Found search string, highlight it. */
310
311          waddnstr(w, s, start);
312
313          _owl_fmtext_wattrset(w, attr ^ OWL_FMTEXT_ATTR_REVERSE);
314          _owl_fmtext_wcolor_set(w, pair);
315         
316          waddnstr(w, s + start, end - start);
317
318          _owl_fmtext_wattrset(w, attr);
319          _owl_fmtext_wcolor_set(w, pair);
320
321          s += end;
322        }
323      }
324      /* Deal with remaining part of string. */
325      waddstr(w, s);
326      p[0] = tmp;
327
328      /* Deal with new attributes. Initialize to defaults, then
329         process all consecutive formatting characters. */
330      attr = f->default_attrs;
331      fg = f->default_fgcolor;
332      bg = f->default_bgcolor;
333      while (owl_fmtext_is_format_char(g_utf8_get_char(p))) {
334        _owl_fmtext_update_attributes(g_utf8_get_char(p), &attr, &fg, &bg);
335        p = g_utf8_next_char(p);
336      }
337      _owl_fmtext_wattrset(w, attr | f->default_attrs);
338      if (fg == OWL_COLOR_DEFAULT) fg = f->default_fgcolor;
339      if (bg == OWL_COLOR_DEFAULT) bg = f->default_bgcolor;
340      _owl_fmtext_update_colorpair(fg, bg, &pair);
341      _owl_fmtext_wcolor_set(w, pair);
342
343      /* Advance to next non-formatting character. */
344      s = p;
345      p = strchr(s, OWL_FMTEXT_UC_STARTBYTE_UTF8);
346    }
347    else {
348      p = strchr(p+1, OWL_FMTEXT_UC_STARTBYTE_UTF8);
349    }
350  }
351  if (s) {
352    waddstr(w, s);
353  }
354  wbkgdset(w, 0);
355}
356
357void owl_fmtext_curs_waddstr(const owl_fmtext *f, WINDOW *w)
358{
359  _owl_fmtext_curs_waddstr(f, w, 1);
360}
361
362void owl_fmtext_curs_waddstr_without_search(const owl_fmtext *f, WINDOW *w)
363{
364  _owl_fmtext_curs_waddstr(f, w, 0);
365}
366
367/* Expands tabs. Tabs are expanded as if given an initial indent of start. */
368void owl_fmtext_expand_tabs(const owl_fmtext *in, owl_fmtext *out, int start) {
369  int col = start, numcopied = 0;
370  char *ptr;
371
372  /* Copy the default attributes. */
373  out->default_attrs = in->default_attrs;
374  out->default_fgcolor = in->default_fgcolor;
375  out->default_bgcolor = in->default_bgcolor;
376
377  for (ptr = in->textbuff;
378       ptr < in->textbuff + in->textlen;
379       ptr = g_utf8_next_char(ptr)) {
380    gunichar c = g_utf8_get_char(ptr);
381    int chwidth;
382    if (c == '\t') {
383      /* Copy up to this tab */
384      _owl_fmtext_append_fmtext(out, in, numcopied, ptr - in->textbuff);
385      /* and then copy spaces for the tab. */
386      chwidth = OWL_TAB_WIDTH - (col % OWL_TAB_WIDTH);
387      owl_fmtext_append_spaces(out, chwidth);
388      col += chwidth;
389      numcopied = g_utf8_next_char(ptr) - in->textbuff;
390    } else {
391      /* Just update col. We'll append later. */
392      if (c == '\n') {
393        col = start;
394      } else if (!owl_fmtext_is_format_char(c)) {
395        col += mk_wcwidth(c);
396      }
397    }
398  }
399  /* Append anything we've missed. */
400  if (numcopied < in->textlen)
401    _owl_fmtext_append_fmtext(out, in, numcopied, in->textlen);
402}
403
404/* start with line 'aline' (where the first line is 0) and print
405 * 'lines' number of lines into 'out'
406 */
407int owl_fmtext_truncate_lines(const owl_fmtext *in, int aline, int lines, owl_fmtext *out)
408{
409  const char *ptr1, *ptr2;
410  int i, offset;
411 
412  /* find the starting line */
413  ptr1 = in->textbuff;
414  for (i = 0; i < aline; i++) {
415    ptr1 = strchr(ptr1, '\n');
416    if (!ptr1) return(-1);
417    ptr1++;
418  }
419 
420  /* ptr1 now holds the starting point */
421
422  /* copy the default attributes */
423  out->default_attrs = in->default_attrs;
424  out->default_fgcolor = in->default_fgcolor;
425  out->default_bgcolor = in->default_bgcolor;
426   
427  /* copy in the next 'lines' lines */
428  if (lines < 1) return(-1);
429
430  for (i = 0; i < lines; i++) {
431    offset = ptr1 - in->textbuff;
432    ptr2 = strchr(ptr1, '\n');
433    if (!ptr2) {
434      /* Copy to the end of the buffer. */
435      _owl_fmtext_append_fmtext(out, in, offset, in->textlen);
436      return(-1);
437    }
438    /* Copy up to, and including, the new line. */
439    _owl_fmtext_append_fmtext(out, in, offset, (ptr2 - ptr1) + offset + 1);
440    ptr1 = ptr2 + 1;
441  }
442  return(0);
443}
444
445/* Implementation of owl_fmtext_truncate_cols. Does not support tabs in input. */
446void _owl_fmtext_truncate_cols_internal(const owl_fmtext *in, int acol, int bcol, owl_fmtext *out)
447{
448  const char *ptr_s, *ptr_e, *ptr_c, *last;
449  int col, st, padding, chwidth;
450
451  /* copy the default attributes */
452  out->default_attrs = in->default_attrs;
453  out->default_fgcolor = in->default_fgcolor;
454  out->default_bgcolor = in->default_bgcolor;
455
456  last=in->textbuff+in->textlen-1;
457  ptr_s=in->textbuff;
458  while (ptr_s <= last) {
459    ptr_e=strchr(ptr_s, '\n');
460    if (!ptr_e) {
461      /* but this shouldn't happen if we end in a \n */
462      break;
463    }
464   
465    if (ptr_e == ptr_s) {
466      owl_fmtext_append_normal(out, "\n");
467      ++ptr_s;
468      continue;
469    }
470
471    col = 0;
472    st = 0;
473    padding = 0;
474    chwidth = 0;
475    ptr_c = ptr_s;
476    while(ptr_c < ptr_e) {
477      gunichar c = g_utf8_get_char(ptr_c);
478      if (!owl_fmtext_is_format_char(c)) {
479        chwidth = mk_wcwidth(c);
480        if (col + chwidth > bcol) break;
481       
482        if (col >= acol) {
483          if (st == 0) {
484            ptr_s = ptr_c;
485            padding = col - acol;
486            ++st;
487          }
488        }
489        col += chwidth;
490        chwidth = 0;
491      }
492      ptr_c = g_utf8_next_char(ptr_c);
493    }
494    if (st) {
495      /* lead padding */
496      owl_fmtext_append_spaces(out, padding);
497      if (ptr_c == ptr_e) {
498        /* We made it to the newline. Append up to, and including it. */
499        _owl_fmtext_append_fmtext(out, in, ptr_s - in->textbuff, ptr_c - in->textbuff + 1);
500      }
501      else if (chwidth > 1) {
502        /* Last char is wide, truncate. */
503        _owl_fmtext_append_fmtext(out, in, ptr_s - in->textbuff, ptr_c - in->textbuff);
504        owl_fmtext_append_normal(out, "\n");
505      }
506      else {
507        /* Last char fits perfectly, We stop at the next char to make
508         * sure we get it all. */
509        ptr_c = g_utf8_next_char(ptr_c);
510        _owl_fmtext_append_fmtext(out, in, ptr_s - in->textbuff, ptr_c - in->textbuff);
511      }
512    }
513    else {
514      owl_fmtext_append_normal(out, "\n");
515    }
516    ptr_s = g_utf8_next_char(ptr_e);
517  }
518}
519
520/* Truncate the message so that each line begins at column 'acol' and
521 * ends at 'bcol' or sooner.  The first column is number 0.  The new
522 * message is placed in 'out'.  The message is expected to end in a
523 * new line for now.
524 *
525 * NOTE: This needs to be modified to deal with backing up if we find
526 * a SPACING COMBINING MARK at the end of a line. If that happens, we
527 * should back up to the last non-mark character and stop there.
528 *
529 * NOTE: If a line ends at bcol, we omit the newline. This is so printing
530 * to ncurses works.
531 */
532void owl_fmtext_truncate_cols(const owl_fmtext *in, int acol, int bcol, owl_fmtext *out)
533{
534  owl_fmtext notabs;
535
536  /* _owl_fmtext_truncate_cols_internal cannot handle tabs. */
537  if (strchr(in->textbuff, '\t')) {
538    owl_fmtext_init_null(&notabs);
539    owl_fmtext_expand_tabs(in, &notabs, 0);
540    _owl_fmtext_truncate_cols_internal(&notabs, acol, bcol, out);
541    owl_fmtext_cleanup(&notabs);
542  } else {
543    _owl_fmtext_truncate_cols_internal(in, acol, bcol, out);
544  }
545}
546
547/* Return the number of lines in 'f' */
548int owl_fmtext_num_lines(const owl_fmtext *f)
549{
550  int lines, i;
551  char *lastbreak, *p;
552
553  lines=0;
554  lastbreak = f->textbuff;
555  for (i=0; i<f->textlen; i++) {
556    if (f->textbuff[i]=='\n') {
557      lastbreak = f->textbuff + i;
558      lines++;
559    }
560  }
561
562  /* Check if there's a trailing line; formatting characters don't count. */
563  for (p = g_utf8_next_char(lastbreak);
564       p < f->textbuff + f->textlen;
565       p = g_utf8_next_char(p)) {
566    if (!owl_fmtext_is_format_char(g_utf8_get_char(p))) {
567      lines++;
568      break;
569    }
570  }
571
572  return(lines);
573}
574
575/* Returns the line number, starting at 0, of the character which
576 * contains the byte at 'offset'. Note that a trailing newline is part
577 * of the line it ends. Also, while a trailing line of formatting
578 * characters does not contribute to owl_fmtext_num_lines, those
579 * characters are considered on a new line. */
580int owl_fmtext_line_number(const owl_fmtext *f, int offset)
581{
582  int i, lineno = 0;
583  if (offset >= f->textlen)
584    offset = f->textlen - 1;
585  for (i = 0; i < offset; i++) {
586    if (f->textbuff[i] == '\n')
587      lineno++;
588  }
589  return lineno;
590}
591
592/* Searches for line 'lineno' in 'f'. The returned range, [start,
593 * end), forms a half-open interval for the extent of the line. */
594void owl_fmtext_line_extents(const owl_fmtext *f, int lineno, int *o_start, int *o_end)
595{
596  int start, end;
597  char *newline;
598  for (start = 0; lineno > 0 && start < f->textlen; start++) {
599    if (f->textbuff[start] == '\n')
600      lineno--;
601  }
602  newline = strchr(f->textbuff + start, '\n');
603  /* Include the newline, if it is there. */
604  end = newline ? newline - f->textbuff + 1 : f->textlen;
605  if (o_start) *o_start = start;
606  if (o_end) *o_end = end;
607}
608
609const char *owl_fmtext_get_text(const owl_fmtext *f)
610{
611  return(f->textbuff);
612}
613
614int owl_fmtext_num_bytes(const owl_fmtext *f)
615{
616  return(f->textlen);
617}
618
619/* set the charater at 'index' to be 'char'.  If index is out of
620 * bounds don't do anything. If c or char at index is not ASCII, don't
621 * do anything because it's not UTF-8 safe. */
622void owl_fmtext_set_char(owl_fmtext *f, int index, char ch)
623{
624  if ((index < 0) || (index > f->textlen-1)) return;
625  /* NOT ASCII*/
626  if (f->textbuff[index] & 0x80 || ch & 0x80) return; 
627  f->textbuff[index]=ch;
628}
629
630/* Make a copy of the fmtext 'src' into 'dst' */
631void owl_fmtext_copy(owl_fmtext *dst, const owl_fmtext *src)
632{
633  int mallocsize;
634
635  if (src->textlen==0) {
636    mallocsize=5;
637  } else {
638    mallocsize=src->textlen+2;
639  }
640  dst->textlen=src->textlen;
641  dst->bufflen=mallocsize;
642  dst->textbuff=owl_malloc(mallocsize);
643  memcpy(dst->textbuff, src->textbuff, src->textlen+1);
644  dst->default_attrs = src->default_attrs;
645  dst->default_fgcolor = src->default_fgcolor;
646  dst->default_bgcolor = src->default_bgcolor;
647}
648
649/* Search 'f' for the regex 're' for matches starting at
650 * 'start'. Returns the offset of the first match, -1 if not
651 * found. This is a case-insensitive search.
652 */
653int owl_fmtext_search(const owl_fmtext *f, const owl_regex *re, int start)
654{
655  int offset;
656  if (start > f->textlen ||
657      owl_regex_compare(re, f->textbuff + start, &offset, NULL) != 0)
658    return -1;
659  return offset + start;
660}
661
662
663/* Append the text 'text' to 'f' and interpret the zephyr style
664 * formatting syntax to set appropriate attributes.
665 */
666void owl_fmtext_append_ztext(owl_fmtext *f, const char *text)
667{
668  int stacksize, curattrs, curcolor;
669  const char *ptr, *txtptr, *tmpptr;
670  char *buff;
671  int attrstack[32], chrstack[32], colorstack[32];
672
673  curattrs=OWL_FMTEXT_ATTR_NONE;
674  curcolor=OWL_COLOR_DEFAULT;
675  stacksize=0;
676  txtptr=text;
677  while (1) {
678    ptr=strpbrk(txtptr, "@{[<()>]}");
679    if (!ptr) {
680      /* add all the rest of the text and exit */
681      owl_fmtext_append_attr(f, txtptr, curattrs, curcolor, OWL_COLOR_DEFAULT);
682      return;
683    } else if (ptr[0]=='@') {
684      /* add the text up to this point then deal with the stack */
685      buff=owl_malloc(ptr-txtptr+20);
686      strncpy(buff, txtptr, ptr-txtptr);
687      buff[ptr-txtptr]='\0';
688      owl_fmtext_append_attr(f, buff, curattrs, curcolor, OWL_COLOR_DEFAULT);
689      owl_free(buff);
690
691      /* update pointer to point at the @ */
692      txtptr=ptr;
693
694      /* now the stack */
695
696      /* if we've hit our max stack depth, print the @ and move on */
697      if (stacksize==32) {
698        owl_fmtext_append_attr(f, "@", curattrs, curcolor, OWL_COLOR_DEFAULT);
699        txtptr++;
700        continue;
701      }
702
703      /* if it's an @@, print an @ and continue */
704      if (txtptr[1]=='@') {
705        owl_fmtext_append_attr(f, "@", curattrs, curcolor, OWL_COLOR_DEFAULT);
706        txtptr+=2;
707        continue;
708      }
709       
710      /* if there's no opener, print the @ and continue */
711      tmpptr=strpbrk(txtptr, "(<[{ ");
712      if (!tmpptr || tmpptr[0]==' ') {
713        owl_fmtext_append_attr(f, "@", curattrs, curcolor, OWL_COLOR_DEFAULT);
714        txtptr++;
715        continue;
716      }
717
718      /* check what command we've got, push it on the stack, start
719         using it, and continue ... unless it's a color command */
720      buff=owl_malloc(tmpptr-ptr+20);
721      strncpy(buff, ptr, tmpptr-ptr);
722      buff[tmpptr-ptr]='\0';
723      if (!strcasecmp(buff, "@bold")) {
724        attrstack[stacksize]=OWL_FMTEXT_ATTR_BOLD;
725        chrstack[stacksize]=tmpptr[0];
726        colorstack[stacksize]=curcolor;
727        stacksize++;
728        curattrs|=OWL_FMTEXT_ATTR_BOLD;
729        txtptr+=6;
730        owl_free(buff);
731        continue;
732      } else if (!strcasecmp(buff, "@b")) {
733        attrstack[stacksize]=OWL_FMTEXT_ATTR_BOLD;
734        chrstack[stacksize]=tmpptr[0];
735        colorstack[stacksize]=curcolor;
736        stacksize++;
737        curattrs|=OWL_FMTEXT_ATTR_BOLD;
738        txtptr+=3;
739        owl_free(buff);
740        continue;
741      } else if (!strcasecmp(buff, "@i")) {
742        attrstack[stacksize]=OWL_FMTEXT_ATTR_UNDERLINE;
743        chrstack[stacksize]=tmpptr[0];
744        colorstack[stacksize]=curcolor;
745        stacksize++;
746        curattrs|=OWL_FMTEXT_ATTR_UNDERLINE;
747        txtptr+=3;
748        owl_free(buff);
749        continue;
750      } else if (!strcasecmp(buff, "@italic")) {
751        attrstack[stacksize]=OWL_FMTEXT_ATTR_UNDERLINE;
752        chrstack[stacksize]=tmpptr[0];
753        colorstack[stacksize]=curcolor;
754        stacksize++;
755        curattrs|=OWL_FMTEXT_ATTR_UNDERLINE;
756        txtptr+=8;
757        owl_free(buff);
758        continue;
759      } else if (!strcasecmp(buff, "@")) {
760        attrstack[stacksize]=OWL_FMTEXT_ATTR_NONE;
761        chrstack[stacksize]=tmpptr[0];
762        colorstack[stacksize]=curcolor;
763        stacksize++;
764        txtptr+=2;
765        owl_free(buff);
766        continue;
767
768        /* if it's a color read the color, set the current color and
769           continue */
770      } else if (!strcasecmp(buff, "@color") 
771                 && owl_global_get_hascolors(&g)
772                 && owl_global_is_colorztext(&g)) {
773        owl_free(buff);
774        txtptr+=7;
775        tmpptr=strpbrk(txtptr, "@{[<()>]}");
776        if (tmpptr &&
777            ((txtptr[-1]=='(' && tmpptr[0]==')') ||
778             (txtptr[-1]=='<' && tmpptr[0]=='>') ||
779             (txtptr[-1]=='[' && tmpptr[0]==']') ||
780             (txtptr[-1]=='{' && tmpptr[0]=='}'))) {
781
782          /* grab the color name */
783          buff=owl_malloc(tmpptr-txtptr+20);
784          strncpy(buff, txtptr, tmpptr-txtptr);
785          buff[tmpptr-txtptr]='\0';
786
787          /* set it as the current color */
788          curcolor=owl_util_string_to_color(buff);
789          if (curcolor == OWL_COLOR_INVALID)
790              curcolor = OWL_COLOR_DEFAULT;
791          owl_free(buff);
792          txtptr=tmpptr+1;
793          continue;
794
795        } else {
796
797        }
798
799      } else {
800        /* if we didn't understand it, we'll print it.  This is different from zwgc
801         * but zwgc seems to be smarter about some screw cases than I am
802         */
803        owl_fmtext_append_attr(f, "@", curattrs, curcolor, OWL_COLOR_DEFAULT);
804        txtptr++;
805        continue;
806      }
807
808    } else if (ptr[0]=='}' || ptr[0]==']' || ptr[0]==')' || ptr[0]=='>') {
809      /* add the text up to this point first */
810      buff=owl_malloc(ptr-txtptr+20);
811      strncpy(buff, txtptr, ptr-txtptr);
812      buff[ptr-txtptr]='\0';
813      owl_fmtext_append_attr(f, buff, curattrs, curcolor, OWL_COLOR_DEFAULT);
814      owl_free(buff);
815
816      /* now deal with the closer */
817      txtptr=ptr;
818
819      /* first, if the stack is empty we must bail (just print and go) */
820      if (stacksize==0) {
821        buff=owl_malloc(5);
822        buff[0]=ptr[0];
823        buff[1]='\0';
824        owl_fmtext_append_attr(f, buff, curattrs, curcolor, OWL_COLOR_DEFAULT);
825        owl_free(buff);
826        txtptr++;
827        continue;
828      }
829
830      /* if the closing char is what's on the stack, turn off the
831         attribue and pop the stack */
832      if ((ptr[0]==')' && chrstack[stacksize-1]=='(') ||
833          (ptr[0]=='>' && chrstack[stacksize-1]=='<') ||
834          (ptr[0]==']' && chrstack[stacksize-1]=='[') ||
835          (ptr[0]=='}' && chrstack[stacksize-1]=='{')) {
836        int i;
837        stacksize--;
838        curattrs=OWL_FMTEXT_ATTR_NONE;
839        curcolor = colorstack[stacksize];
840        for (i=0; i<stacksize; i++) {
841          curattrs|=attrstack[i];
842        }
843        txtptr+=1;
844        continue;
845      } else {
846        /* otherwise print and continue */
847        buff=owl_malloc(5);
848        buff[0]=ptr[0];
849        buff[1]='\0';
850        owl_fmtext_append_attr(f, buff, curattrs, curcolor, OWL_COLOR_DEFAULT);
851        owl_free(buff);
852        txtptr++;
853        continue;
854      }
855    } else {
856      /* we've found an unattached opener, print everything and move on */
857      buff=owl_malloc(ptr-txtptr+20);
858      strncpy(buff, txtptr, ptr-txtptr+1);
859      buff[ptr-txtptr+1]='\0';
860      owl_fmtext_append_attr(f, buff, curattrs, curcolor, OWL_COLOR_DEFAULT);
861      owl_free(buff);
862      txtptr=ptr+1;
863      continue;
864    }
865  }
866}
867
868/* requires that the list values are strings or NULL.
869 * joins the elements together with join_with.
870 * If format_fn is specified, passes it the list element value
871 * and it will return a string which this needs to free. */
872void owl_fmtext_append_list(owl_fmtext *f, const owl_list *l, const char *join_with, char *(format_fn)(const char *))
873{
874  int i, size;
875  const char *elem;
876  char *text;
877
878  size = owl_list_get_size(l);
879  for (i=0; i<size; i++) {
880    elem = owl_list_get_element(l,i);
881    if (elem && format_fn) {
882      text = format_fn(elem);
883      if (text) {
884        owl_fmtext_append_normal(f, text);
885        owl_free(text);
886      }
887    } else if (elem) {
888      owl_fmtext_append_normal(f, elem);
889    }
890    if ((i < size-1) && join_with) {
891      owl_fmtext_append_normal(f, join_with);
892    }
893  }
894}
895
896/* Free all memory allocated by the object */
897void owl_fmtext_cleanup(owl_fmtext *f)
898{
899  if (f->textbuff) owl_free(f->textbuff);
900}
901
902/*** Color Pair manager ***/
903void owl_fmtext_init_colorpair_mgr(owl_colorpair_mgr *cpmgr)
904{
905  /* This could be a bitarray if we wanted to save memory. */
906  short i, j;
907  cpmgr->next = 8;
908 
909  /* The test is <= because we allocate COLORS+1 entries. */
910  cpmgr->pairs = owl_malloc((COLORS+1) * sizeof(short*));
911  for(i = 0; i <= COLORS; i++) {
912    cpmgr->pairs[i] = owl_malloc((COLORS+1) * sizeof(short));
913    for(j = 0; j <= COLORS; j++) {
914      cpmgr->pairs[i][j] = -1;
915    }
916  }
917  if (owl_global_get_hascolors(&g)) {
918    for(i = 0; i < 8; i++) {
919      short fg, bg;
920      if (i >= COLORS) continue;
921      pair_content(i, &fg, &bg);
922      cpmgr->pairs[fg+1][bg+1] = i;
923    }
924  }
925}
926
927/* Reset used list */
928void owl_fmtext_reset_colorpairs(void)
929{
930  if (owl_global_get_hascolors(&g)) {
931    short i, j;
932    owl_colorpair_mgr *cpmgr = owl_global_get_colorpair_mgr(&g);
933    cpmgr->next = 8;
934   
935    /* The test is <= because we allocated COLORS+1 entries. */
936    for(i = 0; i <= COLORS; i++) {
937      for(j = 0; j <= COLORS; j++) {
938        cpmgr->pairs[i][j] = -1;
939      }
940    }
941    for(i = 0; i < 8; i++) {
942      short fg, bg;
943      if (i >= COLORS) continue;
944      pair_content(i, &fg, &bg);
945      cpmgr->pairs[fg+1][bg+1] = i;
946    }
947  }
948}
949
950/* Assign pairs by request */
951short owl_fmtext_get_colorpair(int fg, int bg)
952{
953  owl_colorpair_mgr *cpmgr;
954  short pair;
955
956  /* Sanity (Bounds) Check */
957  if (fg > COLORS || fg < OWL_COLOR_DEFAULT) fg = OWL_COLOR_DEFAULT;
958  if (bg > COLORS || bg < OWL_COLOR_DEFAULT) bg = OWL_COLOR_DEFAULT;
959           
960#ifdef HAVE_USE_DEFAULT_COLORS
961  if (fg == OWL_COLOR_DEFAULT) fg = -1;
962#else
963  if (fg == OWL_COLOR_DEFAULT) fg = 0;
964  if (bg == OWL_COLOR_DEFAULT) bg = 0;
965#endif
966
967  /* looking for a pair we already set up for this draw. */
968  cpmgr = owl_global_get_colorpair_mgr(&g);
969  pair = cpmgr->pairs[fg+1][bg+1];
970  if (!(pair != -1 && pair < cpmgr->next)) {
971    /* If we didn't find a pair, search for a free one to assign. */
972    pair = (cpmgr->next < COLOR_PAIRS) ? cpmgr->next : -1;
973    if (pair != -1) {
974      /* We found a free pair, initialize it. */
975      init_pair(pair, fg, bg);
976      cpmgr->pairs[fg+1][bg+1] = pair;
977      cpmgr->next++;
978    }
979    else if (bg != OWL_COLOR_DEFAULT) {
980      /* We still don't have a pair, drop the background color. Too bad. */
981      owl_function_debugmsg("colorpairs: color shortage - dropping background color.");
982      pair = owl_fmtext_get_colorpair(fg, OWL_COLOR_DEFAULT);
983    }
984    else {
985      /* We still don't have a pair, defaults all around. */
986      owl_function_debugmsg("colorpairs: color shortage - dropping foreground and background color.");
987      pair = 0;
988    }
989  }
990  return pair;
991}
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