lbuf.c

   1 #include <ctype.h>
   2 #include <stdlib.h>
   3 #include <stdio.h>
   4 #include <string.h>
   5 #include <unistd.h>
   6 #include "vi.h"
   7
   8 #define NMARKS_BASE             ('z' - 'a' + 2)
   9 #define NMARKS                  32
  10
  11 /* line operations */
  12 struct lopt {
  13         char *ins;              /* inserted text */
  14         char *del;              /* deleted text */
  15         int pos, n_ins, n_del;  /* modification location */
  16         int pos_off;            /* cursor line offset */
  17         int seq;                /* operation number */
  18         int *mark, *mark_off;   /* saved marks */
  19 };
  20
  21 /* line buffers */
  22 struct lbuf {
  23         int mark[NMARKS];       /* mark lines */
  24         int mark_off[NMARKS];   /* mark line offsets */
  25         char **ln;              /* buffer lines */
  26         char *ln_glob;          /* line global mark */
  27         int ln_n;               /* number of lines in ln[] */
  28         int ln_sz;              /* size of ln[] */
  29         int useq;               /* current operation sequence */
  30         struct lopt *hist;      /* buffer history */
  31         int hist_sz;            /* size of hist[] */
  32         int hist_n;             /* current history head in hist[] */
  33         int hist_u;             /* current undo head in hist[] */
  34         int useq_zero;          /* useq for lbuf_saved() */
  35         int useq_last;          /* useq before hist[] */
  36 };
  37
  38 struct lbuf *lbuf_make(void)
  39 {
  40         struct lbuf *lb = malloc(sizeof(*lb));
  41         int i;
  42         memset(lb, 0, sizeof(*lb));
  43         for (i = 0; i < LEN(lb->mark); i++)
  44                 lb->mark[i] = -1;
  45         lb->useq = 1;
  46         return lb;
  47 }
  48
  49 static void lopt_done(struct lopt *lo)
  50 {
  51         free(lo->ins);
  52         free(lo->del);
  53         free(lo->mark);
  54         free(lo->mark_off);
  55 }
  56
  57 static void lbuf_savemark(struct lbuf *lb, struct lopt *lo, int m)
  58 {
  59         if (lb->mark[m] >= 0) {
  60                 if (!lo->mark) {
  61                         lo->mark = malloc(sizeof(lb->mark));
  62                         lo->mark_off = malloc(sizeof(lb->mark_off));
  63                         memset(lo->mark, 0xff, sizeof(lb->mark));
  64                 }
  65                 lo->mark[m] = lb->mark[m];
  66                 lo->mark_off[m] = lb->mark_off[m];
  67         }
  68 }
  69
  70 static void lbuf_loadmark(struct lbuf *lb, struct lopt *lo, int m)
  71 {
  72         if (lo->mark && lo->mark[m] >= 0) {
  73                 lb->mark[m] = lo->mark[m];
  74                 lb->mark_off[m] = lo->mark_off[m];
  75         }
  76 }
  77
  78 static int markidx(int mark)
  79 {
  80         if (islower(mark))
  81                 return mark - 'a';
  82         if (mark == '\'' || mark == '`')
  83                 return 'z' - 'a' + 1;
  84         if (mark == '*')
  85                 return 'z' - 'a' + 2;
  86         if (mark == '[')
  87                 return 'z' - 'a' + 3;
  88         if (mark == ']')
  89                 return 'z' - 'a' + 4;
  90         return -1;
  91 }
  92
  93 static void lbuf_savepos(struct lbuf *lb, struct lopt *lo)
  94 {
  95         if (lb->mark[markidx('*')] >= 0)
  96                 lo->pos_off = lb->mark_off[markidx('*')];
  97 }
  98
  99 static void lbuf_loadpos(struct lbuf *lb, struct lopt *lo)
 100 {
 101         lb->mark[markidx('*')] = lo->pos;
 102         lb->mark_off[markidx('*')] = lo->pos_off;
 103 }
 104
 105 void lbuf_free(struct lbuf *lb)
 106 {
 107         int i;
 108         for (i = 0; i < lb->ln_n; i++)
 109                 free(lb->ln[i]);
 110         for (i = 0; i < lb->hist_n; i++)
 111                 lopt_done(&lb->hist[i]);
 112         free(lb->hist);
 113         free(lb->ln);
 114         free(lb->ln_glob);
 115         free(lb);
 116 }
 117
 118 static int linelength(char *s)
 119 {
 120         char *r = strchr(s, '\n');
 121         return r ? r - s + 1 : strlen(s);
 122 }
 123
 124 static int linecount(char *s)
 125 {
 126         int n;
 127         for (n = 0; s && *s; n++)
 128                 s += linelength(s);
 129         return n;
 130 }
 131
 132
 133 /* low-level line replacement */
 134 static void lbuf_replace(struct lbuf *lb, char *s, int pos, int n_del)
 135 {
 136         int n_ins = linecount(s);
 137         int i;
 138         while (lb->ln_n + n_ins - n_del >= lb->ln_sz) {
 139                 int nsz = lb->ln_sz + 512;
 140                 char **nln = malloc(nsz * sizeof(nln[0]));
 141                 char *nln_glob = malloc(nsz * sizeof(nln_glob[0]));
 142                 memcpy(nln, lb->ln, lb->ln_n * sizeof(lb->ln[0]));
 143                 memcpy(nln_glob, lb->ln_glob, lb->ln_n * sizeof(lb->ln_glob[0]));
 144                 free(lb->ln);
 145                 free(lb->ln_glob);
 146                 lb->ln = nln;
 147                 lb->ln_glob = nln_glob;
 148                 lb->ln_sz = nsz;
 149         }
 150         for (i = 0; i < n_del; i++)
 151                 free(lb->ln[pos + i]);
 152         memmove(lb->ln + pos + n_ins, lb->ln + pos + n_del,
 153                 (lb->ln_n - pos - n_del) * sizeof(lb->ln[0]));
 154         memmove(lb->ln_glob + pos + n_ins, lb->ln_glob + pos + n_del,
 155                 (lb->ln_n - pos - n_del) * sizeof(lb->ln_glob[0]));
 156         lb->ln_n += n_ins - n_del;
 157         for (i = 0; i < n_ins; i++) {
 158                 int l = s ? linelength(s) : 0;
 159                 int l_nonl = l - (s[l - 1] == '\n');
 160                 char *n = malloc(l_nonl + 2);
 161                 memcpy(n, s, l_nonl);
 162                 n[l_nonl + 0] = '\n';
 163                 n[l_nonl + 1] = '\0';
 164                 lb->ln[pos + i] = n;
 165                 s += l;
 166         }
 167         for (i = n_del; i < n_ins; i++)
 168                 lb->ln_glob[pos + i] = 0;
 169         for (i = 0; i < LEN(lb->mark); i++) {   /* updating marks */
 170                 if (!s && lb->mark[i] >= pos && lb->mark[i] < pos + n_del)
 171                         lb->mark[i] = -1;
 172                 else if (lb->mark[i] >= pos + n_del)
 173                         lb->mark[i] += n_ins - n_del;
 174                 else if (lb->mark[i] >= pos + n_ins)
 175                         lb->mark[i] = pos + n_ins - 1;
 176         }
 177         lbuf_mark(lb, '[', pos, 0);
 178         lbuf_mark(lb, ']', pos + (n_ins ? n_ins - 1 : 0), 0);
 179 }
 180
 181 /* append undo/redo history */
 182 static void lbuf_opt(struct lbuf *lb, char *buf, int pos, int n_del)
 183 {
 184         struct lopt *lo;
 185         int i;
 186         for (i = lb->hist_u; i < lb->hist_n; i++)
 187                 lopt_done(&lb->hist[i]);
 188         lb->hist_n = lb->hist_u;
 189         if (lb->hist_n == lb->hist_sz) {
 190                 int sz = lb->hist_sz + 128;
 191                 struct lopt *hist = malloc(sz * sizeof(hist[0]));
 192                 memcpy(hist, lb->hist, lb->hist_n * sizeof(hist[0]));
 193                 free(lb->hist);
 194                 lb->hist = hist;
 195                 lb->hist_sz = sz;
 196         }
 197         lo = &lb->hist[lb->hist_n];
 198         lb->hist_n++;
 199         lb->hist_u = lb->hist_n;
 200         memset(lo, 0, sizeof(*lo));
 201         lo->pos = pos;
 202         lo->n_del = n_del;
 203         lo->del = n_del ? lbuf_cp(lb, pos, pos + n_del) : NULL;
 204         lo->n_ins = buf ? linecount(buf) : 0;
 205         lo->ins = buf ? uc_dup(buf) : NULL;
 206         lo->seq = lb->useq;
 207         lbuf_savepos(lb, lo);
 208         for (i = 0; i < NMARKS_BASE; i++)
 209                 if (lb->mark[i] >= pos && lb->mark[i] < pos + n_del)
 210                         lbuf_savemark(lb, lo, i);
 211 }
 212
 213 int lbuf_rd(struct lbuf *lbuf, int fd, int beg, int end)
 214 {
 215         char buf[1 << 10];
 216         struct sbuf *sb;
 217         long nr;
 218         sb = sbuf_make();
 219         while ((nr = read(fd, buf, sizeof(buf))) > 0)
 220                 sbuf_mem(sb, buf, nr);
 221         if (!nr)
 222                 lbuf_edit(lbuf, sbuf_buf(sb), beg, end);
 223         sbuf_free(sb);
 224         return nr != 0;
 225 }
 226
 227 int lbuf_wr(struct lbuf *lbuf, int fd, int beg, int end)
 228 {
 229         int i;
 230         for (i = beg; i < end; i++) {
 231                 char *ln = lbuf->ln[i];
 232                 long nw = 0;
 233                 long nl = strlen(ln);
 234                 while (nw < nl) {
 235                         long nc = write(fd, ln + nw, nl - nw);
 236                         if (nc < 0)
 237                                 return 1;
 238                         nw += nc;
 239                 }
 240         }
 241         return 0;
 242 }
 243
 244 /* replace lines beg through end with buf */
 245 void lbuf_edit(struct lbuf *lb, char *buf, int beg, int end)
 246 {
 247         if (beg > lb->ln_n)
 248                 beg = lb->ln_n;
 249         if (end > lb->ln_n)
 250                 end = lb->ln_n;
 251         if (beg == end && !buf)
 252                 return;
 253         lbuf_opt(lb, buf, beg, end - beg);
 254         lbuf_replace(lb, buf, beg, end - beg);
 255 }
 256
 257 char *lbuf_cp(struct lbuf *lb, int beg, int end)
 258 {
 259         struct sbuf *sb;
 260         int i;
 261         sb = sbuf_make();
 262         for (i = beg; i < end; i++)
 263                 if (i < lb->ln_n)
 264                         sbuf_str(sb, lb->ln[i]);
 265         return sbuf_done(sb);
 266 }
 267
 268 char *lbuf_get(struct lbuf *lb, int pos)
 269 {
 270         return pos >= 0 && pos < lb->ln_n ? lb->ln[pos] : NULL;
 271 }
 272
 273 int lbuf_len(struct lbuf *lb)
 274 {
 275         return lb->ln_n;
 276 }
 277
 278 void lbuf_mark(struct lbuf *lbuf, int mark, int pos, int off)
 279 {
 280         if (markidx(mark) >= 0) {
 281                 lbuf->mark[markidx(mark)] = pos;
 282                 lbuf->mark_off[markidx(mark)] = off;
 283         }
 284 }
 285
 286 int lbuf_jump(struct lbuf *lbuf, int mark, int *pos, int *off)
 287 {
 288         int mk = markidx(mark);
 289         if (mk < 0 || lbuf->mark[mk] < 0)
 290                 return 1;
 291         *pos = lbuf->mark[mk];
 292         if (off)
 293                 *off = lbuf->mark_off[mk];
 294         return 0;
 295 }
 296
 297 int lbuf_undo(struct lbuf *lb)
 298 {
 299         int useq, i;
 300         if (!lb->hist_u)
 301                 return 1;
 302         useq = lb->hist[lb->hist_u - 1].seq;
 303         while (lb->hist_u && lb->hist[lb->hist_u - 1].seq == useq) {
 304                 struct lopt *lo = &lb->hist[--(lb->hist_u)];
 305                 lbuf_replace(lb, lo->del, lo->pos, lo->n_ins);
 306                 lbuf_loadpos(lb, lo);
 307                 for (i = 0; i < LEN(lb->mark); i++)
 308                         lbuf_loadmark(lb, lo, i);
 309         }
 310         return 0;
 311 }
 312
 313 int lbuf_redo(struct lbuf *lb)
 314 {
 315         int useq;
 316         if (lb->hist_u == lb->hist_n)
 317                 return 1;
 318         useq = lb->hist[lb->hist_u].seq;
 319         while (lb->hist_u < lb->hist_n && lb->hist[lb->hist_u].seq == useq) {
 320                 struct lopt *lo = &lb->hist[lb->hist_u++];
 321                 lbuf_replace(lb, lo->ins, lo->pos, lo->n_del);
 322                 lbuf_loadpos(lb, lo);
 323         }
 324         return 0;
 325 }
 326
 327 static int lbuf_seq(struct lbuf *lb)
 328 {
 329         return lb->hist_u ? lb->hist[lb->hist_u - 1].seq : lb->useq_last;
 330 }
 331
 332 /* mark buffer as saved and, if clear, clear the undo history */
 333 void lbuf_saved(struct lbuf *lb, int clear)
 334 {
 335         int i;
 336         if (clear) {
 337                 for (i = 0; i < lb->hist_n; i++)
 338                         lopt_done(&lb->hist[i]);
 339                 lb->hist_n = 0;
 340                 lb->hist_u = 0;
 341                 lb->useq_last = lb->useq;
 342         }
 343         lb->useq_zero = lbuf_seq(lb);
 344         lbuf_modified(xb);
 345 }
 346
 347 /* was the file modified since the last lbuf_modreset() */
 348 int lbuf_modified(struct lbuf *lb)
 349 {
 350         lb->useq++;
 351         return lbuf_seq(lb) != lb->useq_zero;
 352 }
 353
 354 /* mark the line for ex global command */
 355 void lbuf_globset(struct lbuf *lb, int pos, int dep)
 356 {
 357         lb->ln_glob[pos] |= 1 << dep;
 358 }
 359
 360 /* return and clear ex global command mark */
 361 int lbuf_globget(struct lbuf *lb, int pos, int dep)
 362 {
 363         int o = lb->ln_glob[pos] & (1 << dep);
 364         lb->ln_glob[pos] &= ~(1 << dep);
 365         return o > 0;
 366 }