termcap.c

   1 /*@ S-nail - a mail user agent derived from Berkeley Mail.
   2  *@ Terminal capability interaction.
   3  *@ For encapsulation purposes provide a basic foundation even without
   4  *@ HAVE_TERMCAP, but with config.h:n_HAVE_TCAP.
   5  *@ HOWTO add a new non-dynamic command or query:
   6  *@ - add an entry to nail.h:enum n_termcap_{cmd,query}
   7  *@ - run make-tcap-map.pl
   8  *@ - update the *termcap* member documentation on changes!
   9  *@ Bug: in case of clashes of two-letter names terminfo(5) wins.
  10  *
  11  * Copyright (c) 2016 - 2018 Steffen (Daode) Nurpmeso <steffen@sdaoden.eu>.
  12  *
  13  * Permission to use, copy, modify, and/or distribute this software for any
  14  * purpose with or without fee is hereby granted, provided that the above
  15  * copyright notice and this permission notice appear in all copies.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  18  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  20  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  21  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  22  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  23  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  24  */
  25 #undef n_FILE
  26 #define n_FILE termcap
  27
  28 #ifndef HAVE_AMALGAMATION
  29 # include "nail.h"
  30 #endif
  31
  32 EMPTY_FILE()
  33 #ifdef n_HAVE_TCAP
  34 /* If available, curses.h must be included before term.h! */
  35 #ifdef HAVE_TERMCAP
  36 # ifdef HAVE_TERMCAP_CURSES
  37 #  include <curses.h>
  38 # endif
  39 # include <term.h>
  40 #endif
  41
  42 /*
  43  * xxx We are not really compatible with very old and strange terminals since
  44  * we don't care at all for circumstances indicated by terminal flags: if we
  45  * find a capability we use it and assume it works.  E.g., if "Co" indicates
  46  * colours we simply use ISO 6429 also for font attributes etc.  That is,
  47  * we don't use the ncurses/terminfo interface with all its internal logic.
  48  */
  49
  50 /* Unless HAVE_TERMINFO or HAVE_TGETENT_NULL_BUF are defined we will use this
  51  * to space the buffer we pass through to tgetent(3).
  52  * Since for (such) elder non-emulated terminals really weird things will
  53  * happen if an entry would require more than 1024 bytes, don't really mind.
  54  * Use a ui16_t for storage */
  55 #define a_TERMCAP_ENTRYSIZE_MAX ((2668 + 128) & ~127) /* As of ncurses 6.0 */
  56
  57 n_CTA(a_TERMCAP_ENTRYSIZE_MAX < UI16_MAX,
  58    "Chosen buffer size exceeds datatype capability");
  59
  60 /* For simplicity we store commands and queries in single continuous control
  61  * and entry structure arrays: to index queries one has to add
  62  * n__TERMCAP_CMD_MAX1 first!  And don't confound with ENTRYSIZE_MAX! */
  63 enum{
  64    a_TERMCAP_ENT_MAX1 = n__TERMCAP_CMD_MAX1 + n__TERMCAP_QUERY_MAX1
  65 };
  66
  67 enum a_termcap_flags{
  68    a_TERMCAP_F_NONE,
  69    /* enum n_termcap_captype values stored here.
  70     * Note that presence of a type in an a_termcap_ent signals initialization */
  71    a_TERMCAP_F_TYPE_MASK = (1<<4) - 1,
  72
  73    a_TERMCAP_F_QUERY = 1<<4,     /* A query rather than a command */
  74    a_TERMCAP_F_DISABLED = 1<<5,  /* User explicitly disabled command/query */
  75    a_TERMCAP_F_ALTERN = 1<<6,    /* Not available, but has alternative */
  76    a_TERMCAP_F_NOENT = 1<<7,     /* Not available */
  77
  78    /* _cmd() argument interpretion (_T_STR) */
  79    a_TERMCAP_F_ARG_IDX1 = 1<<11, /* Argument 1 used, and is an index */
  80    a_TERMCAP_F_ARG_IDX2 = 1<<12,
  81    a_TERMCAP_F_ARG_CNT = 1<<13,  /* .., and is a count */
  82
  83    a_TERMCAP_F__LAST = a_TERMCAP_F_ARG_CNT
  84 };
  85 n_CTA((ui32_t)n__TERMCAP_CAPTYPE_MAX1 <= (ui32_t)a_TERMCAP_F_TYPE_MASK,
  86    "enum n_termcap_captype exceeds bit range of a_termcap_flags");
  87
  88 struct a_termcap_control{
  89    ui16_t tc_flags;
  90    /* Offset base into a_termcap_namedat[], which stores the two-letter
  91     * termcap(5) name directly followed by a NUL terminated terminfo(5) name.
  92     * A termcap(5) name may consist of two NULs meaning ERR_NOENT,
  93     * a terminfo(5) name may be empty for the same purpose */
  94    ui16_t tc_off;
  95 };
  96 n_CTA(a_TERMCAP_F__LAST <= UI16_MAX,
  97    "a_termcap_flags exceed storage datatype in a_termcap_control");
  98
  99 struct a_termcap_ent{
 100    ui16_t te_flags;
 101    ui16_t te_off;    /* in a_termcap_g->tg_dat / value for T_BOOL and T_NUM */
 102 };
 103 n_CTA(a_TERMCAP_F__LAST <= UI16_MAX,
 104    "a_termcap_flags exceed storage datatype in a_termcap_ent");
 105
 106 /* Structure for extended queries, which don't have an entry constant in
 107  * n_termcap_query (to allow free query/binding of keycodes) */
 108 struct a_termcap_ext_ent{
 109    struct a_termcap_ent tee_super;
 110    ui8_t tee__dummy[4];
 111    struct a_termcap_ext_ent *tee_next;
 112    /* Resolvable termcap(5)/terminfo(5) name as given by user; the actual data
 113     * is stored just like for normal queries */
 114    char tee_name[n_VFIELD_SIZE(0)];
 115 };
 116
 117 struct a_termcap_g{
 118    struct a_termcap_ext_ent *tg_ext_ents; /* List of extended queries */
 119    struct a_termcap_ent tg_ents[a_TERMCAP_ENT_MAX1];
 120    struct n_string tg_dat;                /* Storage for resolved caps */
 121 # if !defined HAVE_TGETENT_NULL_BUF && !defined HAVE_TERMINFO
 122    char tg_lib_buf[a_TERMCAP_ENTRYSIZE_MAX];
 123 # endif
 124 };
 125
 126 /* Include the constant make-tcap-map.pl output */
 127 #include <gen-tcaps.h>
 128 n_CTA(sizeof a_termcap_namedat <= UI16_MAX,
 129    "Termcap command and query name data exceed storage datatype");
 130 n_CTA(a_TERMCAP_ENT_MAX1 == n_NELEM(a_termcap_control),
 131    "Control array does not match command/query array to be controlled");
 132
 133 static struct a_termcap_g *a_termcap_g;
 134
 135 /* Query *termcap*, parse it and incorporate into a_termcap_g */
 136 static void a_termcap_init_var(struct str const *termvar);
 137
 138 /* Expand ^CNTRL, \[Ee] and \OCT.  False for parse error and empty results */
 139 static bool_t a_termcap__strexp(struct n_string *store, char const *ibuf);
 140
 141 /* Initialize any _ent for which we have _F_ALTERN and which isn't yet set */
 142 static void a_termcap_init_altern(void);
 143
 144 #ifdef HAVE_TERMCAP
 145 /* Setup the library we use to work with term */
 146 static bool_t a_termcap_load(char const *term);
 147
 148 /* Query the capability tcp and fill in tep (upon success) */
 149 static bool_t a_termcap_ent_query(struct a_termcap_ent *tep,
 150                char const *cname, ui16_t cflags);
 151 n_INLINE bool_t a_termcap_ent_query_tcp(struct a_termcap_ent *tep,
 152                   struct a_termcap_control const *tcp);
 153
 154 /* Output PTF for both, termcap(5) and terminfo(5) */
 155 static int a_termcap_putc(int c);
 156 #endif
 157
 158 /* Get n_termcap_cmd or n_termcap_query constant belonging to (nlen bytes of)
 159  * name, or -1 if not found.  min and max have to be used to cramp the result */
 160 static si32_t a_termcap_enum_for_name(char const *name, size_t nlen,
 161                si32_t min, si32_t max);
 162 #define a_termcap_cmd_for_name(NB,NL) \
 163    a_termcap_enum_for_name(NB, NL, 0, n__TERMCAP_CMD_MAX1)
 164 #define a_termcap_query_for_name(NB,NL) \
 165    a_termcap_enum_for_name(NB, NL, n__TERMCAP_CMD_MAX1, a_TERMCAP_ENT_MAX1)
 166
 167 static void
 168 a_termcap_init_var(struct str const *termvar){
 169    char *cbp_base, *cbp;
 170    size_t i;
 171    char const *ccp;
 172    NYD2_ENTER;
 173
 174    if(termvar->l >= UI16_MAX){
 175       n_err(_("*termcap*: length excesses internal limit, skipping\n"));
 176       goto j_leave;
 177    }
 178
 179    assert(termvar->s[termvar->l] == '\0');
 180    i = termvar->l +1;
 181    cbp_base = salloc(i);
 182    memcpy(cbp = cbp_base, termvar->s, i);
 183
 184    for(; (ccp = n_strsep(&cbp, ',', TRU1)) != NULL;){
 185       struct a_termcap_ent *tep;
 186       size_t kl;
 187       char const *v;
 188       ui16_t f;
 189
 190       /* Separate key/value, if any */
 191       if(/* no empties ccp[0] == '\0' ||*/ ccp[1] == '\0'){
 192 jeinvent:
 193          n_err(_("*termcap*: invalid entry: %s\n"), ccp);
 194          continue;
 195       }
 196       for(kl = 2, v = &ccp[2];; ++kl, ++v){
 197          char c = *v;
 198
 199          if(c == '\0'){
 200             f = n_TERMCAP_CAPTYPE_BOOL;
 201             break;
 202          }else if(c == '#'){
 203             f = n_TERMCAP_CAPTYPE_NUMERIC;
 204             ++v;
 205             break;
 206          }else if(c == '='){
 207             f = n_TERMCAP_CAPTYPE_STRING;
 208             ++v;
 209             break;
 210          }
 211       }
 212
 213       /* Do we know about this one? */
 214       /* C99 */{
 215          struct a_termcap_control const *tcp;
 216          si32_t tci;
 217
 218          tci = a_termcap_enum_for_name(ccp, kl, 0, a_TERMCAP_ENT_MAX1);
 219          if(tci < 0){
 220             /* For key binding purposes, save any given string */
 221 #ifdef HAVE_KEY_BINDINGS
 222             if((f & a_TERMCAP_F_TYPE_MASK) == n_TERMCAP_CAPTYPE_STRING){
 223                struct a_termcap_ext_ent *teep;
 224
 225                teep = smalloc(n_VSTRUCT_SIZEOF(struct a_termcap_ext_ent,
 226                      tee_name) + kl +1);
 227                teep->tee_next = a_termcap_g->tg_ext_ents;
 228                a_termcap_g->tg_ext_ents = teep;
 229                memcpy(teep->tee_name, ccp, kl);
 230                teep->tee_name[kl] = '\0';
 231
 232                tep = &teep->tee_super;
 233                tep->te_flags = n_TERMCAP_CAPTYPE_STRING | a_TERMCAP_F_QUERY;
 234                tep->te_off = (ui16_t)a_termcap_g->tg_dat.s_len;
 235                if(!a_termcap__strexp(&a_termcap_g->tg_dat, v))
 236                   tep->te_flags |= a_TERMCAP_F_DISABLED;
 237                goto jlearned;
 238             }else
 239 #endif /* HAVE_KEY_BINDINGS */
 240                   if(n_poption & n_PO_D_V)
 241                n_err(_("*termcap*: unknown capability: %s\n"), ccp);
 242             continue;
 243          }
 244          i = (size_t)tci;
 245
 246          tcp = &a_termcap_control[i];
 247          if((tcp->tc_flags & a_TERMCAP_F_TYPE_MASK) != f){
 248             n_err(_("*termcap*: entry type mismatch: %s\n"), ccp);
 249             break;
 250          }
 251          tep = &a_termcap_g->tg_ents[i];
 252          tep->te_flags = tcp->tc_flags;
 253          tep->te_off = (ui16_t)a_termcap_g->tg_dat.s_len;
 254       }
 255
 256       if((f & a_TERMCAP_F_TYPE_MASK) == n_TERMCAP_CAPTYPE_BOOL)
 257          ;
 258       else if(*v == '\0')
 259          tep->te_flags |= a_TERMCAP_F_DISABLED;
 260       else if((f & a_TERMCAP_F_TYPE_MASK) == n_TERMCAP_CAPTYPE_NUMERIC){
 261          if((n_idec_ui16_cp(&tep->te_off, v, 0, NULL
 262                   ) & (n_IDEC_STATE_EMASK | n_IDEC_STATE_CONSUMED)
 263                ) != n_IDEC_STATE_CONSUMED)
 264             goto jeinvent;
 265       }else if(!a_termcap__strexp(&a_termcap_g->tg_dat, v))
 266          tep->te_flags |= a_TERMCAP_F_DISABLED;
 267 #ifdef HAVE_KEY_BINDINGS
 268 jlearned:
 269 #endif
 270       if(n_poption & n_PO_D_VV)
 271          n_err(_("*termcap*: learned %.*s: %s\n"), (int)kl, ccp,
 272             (tep->te_flags & a_TERMCAP_F_DISABLED ? "<disabled>"
 273              : (f & a_TERMCAP_F_TYPE_MASK) == n_TERMCAP_CAPTYPE_BOOL ? "true"
 274                : v));
 275    }
 276    DBG( if(n_poption & n_PO_D_V) n_err("*termcap* parsed: buffer used=%lu\n",
 277       (ul_i)a_termcap_g->tg_dat.s_len) );
 278
 279    /* Catch some inter-dependencies the user may have triggered */
 280 #ifdef HAVE_TERMCAP
 281    if(a_termcap_g->tg_ents[n_TERMCAP_CMD_te].te_flags & a_TERMCAP_F_DISABLED)
 282       a_termcap_g->tg_ents[n_TERMCAP_CMD_ti].te_flags = a_TERMCAP_F_DISABLED;
 283    else if(a_termcap_g->tg_ents[n_TERMCAP_CMD_ti].te_flags &
 284          a_TERMCAP_F_DISABLED)
 285       a_termcap_g->tg_ents[n_TERMCAP_CMD_te].te_flags = a_TERMCAP_F_DISABLED;
 286 #endif
 287
 288 j_leave:
 289    NYD2_LEAVE;
 290 }
 291
 292 static bool_t
 293 a_termcap__strexp(struct n_string *store, char const *ibuf){ /* XXX ASCII */
 294    char c;
 295    char const *oibuf;
 296    size_t olen;
 297    NYD2_ENTER;
 298
 299    olen = store->s_len;
 300
 301    for(oibuf = ibuf; (c = *ibuf) != '\0';){
 302       if(c == '\\'){
 303          if((c = ibuf[1]) == '\0')
 304             goto jebsseq;
 305
 306          if(c == 'E'){
 307             c = '\033';
 308             ibuf += 2;
 309             goto jpush;
 310          }
 311
 312          if(octalchar(c)){
 313             char c2, c3;
 314
 315             if((c2 = ibuf[2]) == '\0' || !octalchar(c2) ||
 316                   (c3 = ibuf[3]) == '\0' || !octalchar(c3)){
 317                n_err(_("*termcap*: invalid octal sequence: %s\n"), oibuf);
 318                goto jerr;
 319             }
 320             c -= '0', c2 -= '0', c3 -= '0';
 321             c <<= 3, c |= c2;
 322             if((ui8_t)c > 0x1F){
 323                n_err(_("*termcap*: octal number too large: %s\n"), oibuf);
 324                goto jerr;
 325             }
 326             c <<= 3, c |= c3;
 327             ibuf += 4;
 328             goto jpush;
 329          }
 330 jebsseq:
 331          n_err(_("*termcap*: invalid reverse solidus \\ sequence: %s\n"),oibuf);
 332          goto jerr;
 333       }else if(c == '^'){
 334          if((c = ibuf[1]) == '\0'){
 335             n_err(_("*termcap*: incomplete ^CNTRL sequence: %s\n"), oibuf);
 336             goto jerr;
 337          }
 338          c = upperconv(c) ^ 0x40;
 339          if((ui8_t)c > 0x1F && c != 0x7F){ /* ASCII C0: 0..1F, 7F */
 340             n_err(_("*termcap*: invalid ^CNTRL sequence: %s\n"), oibuf);
 341             goto jerr;
 342          }
 343          ibuf += 2;
 344       }else
 345          ++ibuf;
 346
 347 jpush:
 348       store = n_string_push_c(store, c);
 349    }
 350
 351    c = (store->s_len != olen) ? '\1' : '\0';
 352 jleave:
 353    n_string_push_c(store, '\0');
 354    NYD2_LEAVE;
 355    return (c != '\0');
 356 jerr:
 357    store = n_string_trunc(store, olen);
 358    c = '\0';
 359    goto jleave;
 360 }
 361
 362 static void
 363 a_termcap_init_altern(void){
 364    /* We silently ignore user _F_DISABLED requests for those entries for which
 365     * we have fallback entries, and which we need to ensure proper functioning.
 366     * I.e., this allows users to explicitly disable some termcap(5) capability
 367     * and enforce usage of the built-in fallback */
 368    /* xxx Use table-based approach for fallback strategies */
 369 #define a_OK(CMD) a_OOK(&a_termcap_g->tg_ents[CMD])
 370 #define a_OOK(TEP) \
 371    ((TEP)->te_flags != 0 && !((TEP)->te_flags & a_TERMCAP_F_NOENT))
 372 #define a_SET(TEP,CMD,ALT) \
 373    (TEP)->te_flags = a_termcap_control[CMD].tc_flags |\
 374       ((ALT) ? a_TERMCAP_F_ALTERN : 0)
 375
 376    struct a_termcap_ent *tep;
 377    NYD2_ENTER;
 378    n_UNUSED(tep);
 379
 380    /* For simplicity in the rest of this file null flags of disabled commands,
 381     * as we won't check and try to lazy query any command */
 382    /* C99 */{
 383       size_t i;
 384
 385       for(i = n__TERMCAP_CMD_MAX1;;){
 386          if(i-- == 0)
 387             break;
 388          if((tep = &a_termcap_g->tg_ents[i])->te_flags & a_TERMCAP_F_DISABLED)
 389             tep->te_flags = 0;
 390       }
 391    }
 392
 393 #ifdef HAVE_TERMCAP
 394    /* cl == ho+cd */
 395    tep = &a_termcap_g->tg_ents[n_TERMCAP_CMD_cl];
 396    if(!a_OOK(tep)){
 397       if(a_OK(n_TERMCAP_CMD_cd) && a_OK(n_TERMCAP_CMD_ho))
 398          a_SET(tep, n_TERMCAP_CMD_cl, TRU1);
 399    }
 400 #endif
 401
 402 #ifdef HAVE_MLE
 403    /* ce == ch + [:SPC:] (start column specified by argument) */
 404    tep = &a_termcap_g->tg_ents[n_TERMCAP_CMD_ce];
 405    if(!a_OOK(tep))
 406       a_SET(tep, n_TERMCAP_CMD_ce, TRU1);
 407
 408    /* ch == cr[\r] + nd[:\033C:] */
 409    tep = &a_termcap_g->tg_ents[n_TERMCAP_CMD_ch];
 410    if(!a_OOK(tep))
 411       a_SET(tep, n_TERMCAP_CMD_ch, TRU1);
 412
 413    /* cr == \r */
 414    tep = &a_termcap_g->tg_ents[n_TERMCAP_CMD_cr];
 415    if(!a_OOK(tep)){
 416       a_SET(tep, n_TERMCAP_CMD_cr, FAL0);
 417       tep->te_off = (ui16_t)a_termcap_g->tg_dat.s_len;
 418       n_string_push_c(n_string_push_c(&a_termcap_g->tg_dat, '\r'), '\0');
 419    }
 420
 421    /* le == \b */
 422    tep = &a_termcap_g->tg_ents[n_TERMCAP_CMD_le];
 423    if(!a_OOK(tep)){
 424       a_SET(tep, n_TERMCAP_CMD_le, FAL0);
 425       tep->te_off = (ui16_t)a_termcap_g->tg_dat.s_len;
 426       n_string_push_c(n_string_push_c(&a_termcap_g->tg_dat, '\b'), '\0');
 427    }
 428
 429    /* nd == \033[C (we may not fail, anyway, so use xterm sequence default) */
 430    tep = &a_termcap_g->tg_ents[n_TERMCAP_CMD_nd];
 431    if(!a_OOK(tep)){
 432       a_SET(tep, n_TERMCAP_CMD_nd, FAL0);
 433       tep->te_off = (ui16_t)a_termcap_g->tg_dat.s_len;
 434       n_string_push_buf(&a_termcap_g->tg_dat, "\033[C", sizeof("\033[C"));
 435    }
 436 #endif /* HAVE_MLE */
 437
 438    NYD2_LEAVE;
 439 #undef a_OK
 440 #undef a_OOK
 441 #undef a_SET
 442 }
 443
 444 #ifdef HAVE_TERMCAP
 445 # ifdef HAVE_TERMINFO
 446 static bool_t
 447 a_termcap_load(char const *term){
 448    bool_t rv;
 449    int err;
 450    NYD2_ENTER;
 451
 452    if(!(rv = (setupterm(term, fileno(n_tty_fp), &err) == OK)))
 453       n_err(_("Unknown ${TERM}inal, using only *termcap*: %s\n"), term);
 454    NYD2_LEAVE;
 455    return rv;
 456 }
 457
 458 static bool_t
 459 a_termcap_ent_query(struct a_termcap_ent *tep,
 460       char const *cname, ui16_t cflags){
 461    bool_t rv;
 462    NYD2_ENTER;
 463    assert(!(n_psonce & n_PSO_TERMCAP_DISABLE));
 464
 465    if(n_UNLIKELY(*cname == '\0'))
 466       rv = FAL0;
 467    else switch((tep->te_flags = cflags) & a_TERMCAP_F_TYPE_MASK){
 468    case n_TERMCAP_CAPTYPE_BOOL:
 469       tep->te_off = (tigetflag(cname) > 0);
 470       rv = TRU1;
 471       break;
 472    case n_TERMCAP_CAPTYPE_NUMERIC:{
 473       int r = tigetnum(cname);
 474
 475       if((rv = (r >= 0)))
 476          tep->te_off = (ui16_t)n_MIN(UI16_MAX, r);
 477       else
 478          tep->te_flags |= a_TERMCAP_F_NOENT;
 479       }break;
 480    default:
 481    case n_TERMCAP_CAPTYPE_STRING:{
 482       char *cp;
 483
 484       cp = tigetstr(cname);
 485       if((rv = (cp != NULL && cp != (char*)-1))){
 486          tep->te_off = (ui16_t)a_termcap_g->tg_dat.s_len;
 487          n_string_push_buf(&a_termcap_g->tg_dat, cp, strlen(cp) +1);
 488       }else
 489          tep->te_flags |= a_TERMCAP_F_NOENT;
 490       }break;
 491    }
 492    NYD2_LEAVE;
 493    return rv;
 494 }
 495
 496 n_INLINE bool_t
 497 a_termcap_ent_query_tcp(struct a_termcap_ent *tep,
 498       struct a_termcap_control const *tcp){
 499    assert(!(n_psonce & n_PSO_TERMCAP_DISABLE));
 500    return a_termcap_ent_query(tep, &a_termcap_namedat[tcp->tc_off] + 2,
 501       tcp->tc_flags);
 502 }
 503
 504 # else /* HAVE_TERMINFO */
 505 static bool_t
 506 a_termcap_load(char const *term){
 507    bool_t rv;
 508    NYD2_ENTER;
 509
 510    /* ncurses may return -1 */
 511 # ifndef HAVE_TGETENT_NULL_BUF
 512 #  define a_BUF &a_termcap_g->tg_lib_buf[0]
 513 # else
 514 #  define a_BUF NULL
 515 # endif
 516    if(!(rv = tgetent(a_BUF, term) > 0))
 517       n_err(_("Unknown ${TERM}inal, using only *termcap*: %s\n"), term);
 518 # undef a_BUF
 519    NYD2_LEAVE;
 520    return rv;
 521 }
 522
 523 static bool_t
 524 a_termcap_ent_query(struct a_termcap_ent *tep,
 525       char const *cname, ui16_t cflags){
 526    bool_t rv;
 527    NYD2_ENTER;
 528    assert(!(n_psonce & n_PSO_TERMCAP_DISABLE));
 529
 530    if(n_UNLIKELY(*cname == '\0'))
 531       rv = FAL0;
 532    else switch((tep->te_flags = cflags) & a_TERMCAP_F_TYPE_MASK){
 533    case n_TERMCAP_CAPTYPE_BOOL:
 534       tep->te_off = (tgetflag(cname) > 0);
 535       rv = TRU1;
 536       break;
 537    case n_TERMCAP_CAPTYPE_NUMERIC:{
 538       int r = tgetnum(cname);
 539
 540       if((rv = (r >= 0)))
 541          tep->te_off = (ui16_t)n_MIN(UI16_MAX, r);
 542       else
 543          tep->te_flags |= a_TERMCAP_F_NOENT;
 544       }break;
 545    default:
 546    case n_TERMCAP_CAPTYPE_STRING:{
 547 # ifndef HAVE_TGETENT_NULL_BUF
 548       char buf_base[a_TERMCAP_ENTRYSIZE_MAX], *buf = &buf_base[0];
 549 #  define a_BUF &buf
 550 # else
 551 #  define a_BUF NULL
 552 # endif
 553       char *cp;
 554
 555       if((rv = ((cp = tgetstr(cname, a_BUF)) != NULL))){
 556          tep->te_off = (ui16_t)a_termcap_g->tg_dat.s_len;
 557          n_string_push_buf(&a_termcap_g->tg_dat, cp, strlen(cp) +1);
 558 # undef a_BUF
 559       }else
 560          tep->te_flags |= a_TERMCAP_F_NOENT;
 561       }break;
 562    }
 563    NYD2_LEAVE;
 564    return rv;
 565 }
 566
 567 n_INLINE bool_t
 568 a_termcap_ent_query_tcp(struct a_termcap_ent *tep,
 569       struct a_termcap_control const *tcp){
 570    assert(!(n_psonce & n_PSO_TERMCAP_DISABLE));
 571    return a_termcap_ent_query(tep, &a_termcap_namedat[tcp->tc_off],
 572       tcp->tc_flags);
 573 }
 574 # endif /* !HAVE_TERMINFO */
 575
 576 static int
 577 a_termcap_putc(int c){
 578    return putc(c, n_tty_fp);
 579 }
 580 #endif /* HAVE_TERMCAP */
 581
 582 static si32_t
 583 a_termcap_enum_for_name(char const *name, size_t nlen, si32_t min, si32_t max){
 584    struct a_termcap_control const *tcp;
 585    char const *cnam;
 586    si32_t rv;
 587    NYD2_ENTER;
 588
 589    /* Prefer terminfo(5) names */
 590    for(rv = max;;){
 591       if(rv-- == min){
 592          rv = -1;
 593          break;
 594       }
 595
 596       tcp = &a_termcap_control[(ui32_t)rv];
 597       cnam = &a_termcap_namedat[tcp->tc_off];
 598       if(cnam[2] != '\0'){
 599          char const *xcp = cnam + 2;
 600
 601          if(nlen == strlen(xcp) && !memcmp(xcp, name, nlen))
 602             break;
 603       }
 604       if(nlen == 2 && cnam[0] == name[0] && cnam[1] == name[1])
 605          break;
 606    }
 607    NYD2_LEAVE;
 608    return rv;
 609 }
 610
 611 FL void
 612 n_termcap_init(void){
 613    struct str termvar;
 614    char const *ccp;
 615    NYD_ENTER;
 616
 617    assert((n_psonce & n_PSO_INTERACTIVE) && !(n_poption & n_PO_QUICKRUN_MASK));
 618
 619    a_termcap_g = smalloc(sizeof *a_termcap_g);
 620    a_termcap_g->tg_ext_ents = NULL;
 621    memset(&a_termcap_g->tg_ents[0], 0, sizeof(a_termcap_g->tg_ents));
 622    if((ccp = ok_vlook(termcap)) != NULL)
 623       termvar.l = strlen(termvar.s = n_UNCONST(ccp));
 624    else
 625       /*termvar.s = NULL,*/ termvar.l = 0;
 626    n_string_reserve(n_string_creat(&a_termcap_g->tg_dat),
 627       ((termvar.l + (256 - 64)) & ~127));
 628
 629    if(termvar.l > 0)
 630       a_termcap_init_var(&termvar);
 631
 632    if(ok_blook(termcap_disable))
 633       n_psonce |= n_PSO_TERMCAP_DISABLE;
 634 #ifdef HAVE_TERMCAP
 635    else if((ccp = ok_vlook(TERM)) == NULL){
 636       n_err(_("Environment variable $TERM is not set, using only *termcap*\n"));
 637       n_psonce |= n_PSO_TERMCAP_DISABLE;
 638    }else if(!a_termcap_load(ccp))
 639       n_psonce |= n_PSO_TERMCAP_DISABLE;
 640    else{
 641       /* Query termcap(5) for each command slot that is not yet set */
 642       struct a_termcap_ent *tep;
 643       size_t i;
 644
 645       for(i = n__TERMCAP_CMD_MAX1;;){
 646          if(i-- == 0)
 647             break;
 648          if((tep = &a_termcap_g->tg_ents[i])->te_flags == 0)
 649             a_termcap_ent_query_tcp(tep, &a_termcap_control[i]);
 650       }
 651    }
 652 #endif
 653
 654    a_termcap_init_altern();
 655
 656 #ifdef HAVE_TERMCAP
 657    if(a_termcap_g->tg_ents[n_TERMCAP_CMD_te].te_flags != 0 &&
 658          ok_blook(termcap_ca_mode))
 659       n_psonce |= n_PSO_TERMCAP_CA_MODE;
 660 #endif
 661    n_TERMCAP_RESUME(TRU1);
 662    NYD_LEAVE;
 663 }
 664
 665 FL void
 666 n_termcap_destroy(void){
 667    NYD_ENTER;
 668    assert((n_psonce & n_PSO_INTERACTIVE) && !(n_poption & n_PO_QUICKRUN_MASK));
 669    assert(a_termcap_g != NULL);
 670
 671    n_TERMCAP_SUSPEND(TRU1);
 672
 673 #ifdef HAVE_DEBUG
 674    /* C99 */{
 675       struct a_termcap_ext_ent *tmp;
 676
 677       while((tmp = a_termcap_g->tg_ext_ents) != NULL){
 678          a_termcap_g->tg_ext_ents = tmp->tee_next;
 679          free(tmp);
 680       }
 681    }
 682    n_string_gut(&a_termcap_g->tg_dat);
 683    free(a_termcap_g);
 684    a_termcap_g = NULL;
 685 #endif
 686    NYD_LEAVE;
 687 }
 688
 689 #ifdef HAVE_TERMCAP
 690 FL void
 691 n_termcap_resume(bool_t complete){
 692    NYD_ENTER;
 693    if(a_termcap_g != NULL && !(n_psonce & n_PSO_TERMCAP_DISABLE)){
 694       if(complete && (n_psonce & n_PSO_TERMCAP_CA_MODE))
 695          n_termcap_cmdx(n_TERMCAP_CMD_ti);
 696       n_termcap_cmdx(n_TERMCAP_CMD_ks);
 697       fflush(n_tty_fp);
 698    }
 699    NYD_LEAVE;
 700 }
 701
 702 FL void
 703 n_termcap_suspend(bool_t complete){
 704    NYD_ENTER;
 705    if(a_termcap_g != NULL && !(n_psonce & n_PSO_TERMCAP_DISABLE)){
 706       n_termcap_cmdx(n_TERMCAP_CMD_ke);
 707       if(complete && (n_psonce & n_PSO_TERMCAP_CA_MODE))
 708          n_termcap_cmdx(n_TERMCAP_CMD_te);
 709       fflush(n_tty_fp);
 710    }
 711    NYD_LEAVE;
 712 }
 713 #endif /* HAVE_TERMCAP */
 714
 715 FL ssize_t
 716 n_termcap_cmd(enum n_termcap_cmd cmd, ssize_t a1, ssize_t a2){
 717    /* Commands are not lazy queried */
 718    struct a_termcap_ent const *tep;
 719    enum a_termcap_flags flags;
 720    ssize_t rv;
 721    NYD2_ENTER;
 722    n_UNUSED(a1);
 723    n_UNUSED(a2);
 724
 725    rv = FAL0;
 726    if(a_termcap_g == NULL)
 727       goto jleave;
 728
 729    flags = cmd & ~n__TERMCAP_CMD_MASK;
 730    cmd &= n__TERMCAP_CMD_MASK;
 731    tep = a_termcap_g->tg_ents;
 732
 733    if((flags & n_TERMCAP_CMD_FLAG_CA_MODE) &&
 734          !(n_psonce & n_PSO_TERMCAP_CA_MODE))
 735       rv = TRU1;
 736    else if((tep += cmd)->te_flags == 0 || (tep->te_flags & a_TERMCAP_F_NOENT))
 737       rv = TRUM1;
 738    else if(!(tep->te_flags & a_TERMCAP_F_ALTERN)){
 739       char const *cp;
 740
 741       assert((tep->te_flags & a_TERMCAP_F_TYPE_MASK) ==
 742          n_TERMCAP_CAPTYPE_STRING);
 743
 744       cp = &a_termcap_g->tg_dat.s_dat[tep->te_off];
 745
 746 #ifdef HAVE_TERMCAP
 747       if(tep->te_flags & (a_TERMCAP_F_ARG_IDX1 | a_TERMCAP_F_ARG_IDX2)){
 748          if(n_psonce & n_PSO_TERMCAP_DISABLE){
 749             if(n_poption & n_PO_D_V){
 750                char const *cnam = &a_termcap_namedat[
 751                      a_termcap_control[cmd].tc_off];
 752
 753                if(cnam[2] != '\0')
 754                   cnam += 2;
 755                n_err(_("*termcap-disable*d (/$TERM not set/unknown): "
 756                   "can't perform CAP: %s\n"), cnam);
 757             }
 758             goto jleave;
 759          }
 760
 761          /* Follow Thomas Dickey's advise on pre-va_arg prototypes, add 0s */
 762 # ifdef HAVE_TERMINFO
 763          if((cp = tparm(cp, a1, a2, 0,0,0,0,0,0,0)) == NULL)
 764             goto jleave;
 765 # else
 766          /* curs_termcap.3:
 767           * The \fBtgoto\fP function swaps the order of parameters.
 768           * It does this also for calls requiring only a single parameter.
 769           * In that case, the first parameter is merely a placeholder. */
 770          if(!(tep->te_flags & a_TERMCAP_F_ARG_IDX2)){
 771             a2 = a1;
 772             a1 = (ui32_t)-1;
 773          }
 774          if((cp = tgoto(cp, (int)a1, (int)a2)) == NULL)
 775             goto jleave;
 776 # endif
 777       }
 778 #endif /* HAVE_TERMCAP */
 779
 780       for(;;){
 781 #ifdef HAVE_TERMCAP
 782          if(!(n_psonce & n_PSO_TERMCAP_DISABLE)){
 783             if(tputs(cp, 1, &a_termcap_putc) != OK)
 784                break;
 785          }else
 786 #endif
 787                if(fputs(cp, n_tty_fp) == EOF)
 788             break;
 789          if(!(tep->te_flags & a_TERMCAP_F_ARG_CNT) || --a1 <= 0){
 790             rv = TRU1;
 791             break;
 792          }
 793       }
 794       goto jflush;
 795    }else{
 796       switch(cmd){
 797       default:
 798          rv = TRUM1;
 799          break;
 800
 801 #ifdef HAVE_TERMCAP
 802       case n_TERMCAP_CMD_cl: /* cl = ho + cd */
 803          rv = n_termcap_cmdx(n_TERMCAP_CMD_ho);
 804          if(rv > 0)
 805             rv = n_termcap_cmdx(n_TERMCAP_CMD_cd | flags);
 806          break;
 807 #endif
 808
 809 #ifdef HAVE_MLE
 810       case n_TERMCAP_CMD_ce: /* ce == ch + [:SPC:] */
 811          if(a1 > 0)
 812             --a1;
 813          if((rv = n_termcap_cmd(n_TERMCAP_CMD_ch, a1, 0)) > 0){
 814             for(a2 = n_scrnwidth - a1 - 1; a2 > 0; --a2)
 815                if(putc(' ', n_tty_fp) == EOF){
 816                   rv = FAL0;
 817                   break;
 818                }
 819             if(rv && n_termcap_cmd(n_TERMCAP_CMD_ch, a1, -1) != TRU1)
 820                rv = FAL0;
 821          }
 822          break;
 823       case n_TERMCAP_CMD_ch: /* ch == cr + nd */
 824          rv = n_termcap_cmdx(n_TERMCAP_CMD_cr);
 825          if(rv > 0 && a1 > 0){
 826             rv = n_termcap_cmd(n_TERMCAP_CMD_nd, a1, -1);
 827          }
 828          break;
 829 #endif /* HAVE_MLE */
 830       }
 831
 832 jflush:
 833       if(flags & n_TERMCAP_CMD_FLAG_FLUSH)
 834          fflush(n_tty_fp);
 835       if(ferror(n_tty_fp))
 836          rv = FAL0;
 837    }
 838
 839 jleave:
 840    NYD2_LEAVE;
 841    return rv;
 842 }
 843
 844 FL bool_t
 845 n_termcap_query(enum n_termcap_query query, struct n_termcap_value *tvp){
 846    /* Queries are lazy queried upon request */
 847    struct a_termcap_ent const *tep;
 848    bool_t rv;
 849    NYD2_ENTER;
 850
 851    assert(tvp != NULL);
 852
 853    rv = FAL0;
 854    if(a_termcap_g == NULL)
 855       goto jleave;
 856
 857    /* Is it a built-in query? */
 858    if(query != n__TERMCAP_QUERY_MAX1){
 859       tep = &a_termcap_g->tg_ents[n__TERMCAP_CMD_MAX1 + query];
 860
 861       if(tep->te_flags == 0
 862 #ifdef HAVE_TERMCAP
 863             && ((n_psonce & n_PSO_TERMCAP_DISABLE) ||
 864                !a_termcap_ent_query_tcp(n_UNCONST(tep),
 865                &a_termcap_control[n__TERMCAP_CMD_MAX1 + query]))
 866 #endif
 867       )
 868          goto jleave;
 869    }else{
 870 #ifdef HAVE_TERMCAP
 871       size_t nlen;
 872 #endif
 873       struct a_termcap_ext_ent *teep;
 874       char const *ndat = tvp->tv_data.tvd_string;
 875
 876       for(teep = a_termcap_g->tg_ext_ents; teep != NULL; teep = teep->tee_next)
 877          if(!strcmp(teep->tee_name, ndat)){
 878             tep = &teep->tee_super;
 879             goto jextok;
 880          }
 881
 882 #ifdef HAVE_TERMCAP
 883       if(n_psonce & n_PSO_TERMCAP_DISABLE)
 884 #endif
 885          goto jleave;
 886 #ifdef HAVE_TERMCAP
 887       nlen = strlen(ndat) +1;
 888       teep = smalloc(n_VSTRUCT_SIZEOF(struct a_termcap_ext_ent, tee_name) +
 889             nlen);
 890       tep = &teep->tee_super;
 891       teep->tee_next = a_termcap_g->tg_ext_ents;
 892       a_termcap_g->tg_ext_ents = teep;
 893       memcpy(teep->tee_name, ndat, nlen);
 894
 895       if(!a_termcap_ent_query(n_UNCONST(tep), ndat,
 896                n_TERMCAP_CAPTYPE_STRING | a_TERMCAP_F_QUERY))
 897          goto jleave;
 898 #endif
 899 jextok:;
 900    }
 901
 902    if(tep->te_flags & a_TERMCAP_F_NOENT)
 903       goto jleave;
 904
 905    rv = (tep->te_flags & a_TERMCAP_F_ALTERN) ? TRUM1 : TRU1;
 906
 907    switch((tvp->tv_captype = tep->te_flags & a_TERMCAP_F_TYPE_MASK)){
 908    case n_TERMCAP_CAPTYPE_BOOL:
 909       tvp->tv_data.tvd_bool = (bool_t)tep->te_off;
 910       break;
 911    case n_TERMCAP_CAPTYPE_NUMERIC:
 912       tvp->tv_data.tvd_numeric = (ui32_t)tep->te_off;
 913       break;
 914    default:
 915    case n_TERMCAP_CAPTYPE_STRING:
 916       tvp->tv_data.tvd_string = a_termcap_g->tg_dat.s_dat + tep->te_off;
 917       break;
 918    }
 919 jleave:
 920    NYD2_LEAVE;
 921    return rv;
 922 }
 923
 924 #ifdef HAVE_KEY_BINDINGS
 925 FL si32_t
 926 n_termcap_query_for_name(char const *name, enum n_termcap_captype type){
 927    si32_t rv;
 928    NYD2_ENTER;
 929
 930    if((rv = a_termcap_query_for_name(name, strlen(name))) >= 0){
 931       struct a_termcap_control const *tcp = &a_termcap_control[(ui32_t)rv];
 932
 933       if(type != n_TERMCAP_CAPTYPE_NONE &&
 934             (tcp->tc_flags & a_TERMCAP_F_TYPE_MASK) != type)
 935          rv = -2;
 936       else
 937          rv -= n__TERMCAP_CMD_MAX1;
 938    }
 939    NYD2_LEAVE;
 940    return rv;
 941 }
 942
 943 FL char const *
 944 n_termcap_name_of_query(enum n_termcap_query query){
 945    char const *rv;
 946    NYD2_ENTER;
 947
 948    rv = &a_termcap_namedat[
 949          a_termcap_control[n__TERMCAP_CMD_MAX1 + query].tc_off + 2];
 950    NYD2_LEAVE;
 951    return rv;
 952 }
 953 #endif /* HAVE_KEY_BINDINGS */
 954 #endif /* n_HAVE_TCAP */
 955
 956 /* s-it-mode */