nail.h

   1 /*@ S-nail - a mail user agent derived from Berkeley Mail.
   2  *@ Header inclusion, macros, constants, types and the global var declarations.
   3  *
   4  * Copyright (c) 2000-2004 Gunnar Ritter, Freiburg i. Br., Germany.
   5  * Copyright (c) 2012 - 2015 Steffen (Daode) Nurpmeso <sdaoden@users.sf.net>.
   6  */
   7 /*
   8  * Copyright (c) 1980, 1993
   9  *      The Regents of the University of California.  All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 /*
  37  * Mail -- a mail program
  38  *
  39  * Author: Kurt Shoens (UCB) March 25, 1978
  40  */
  41
  42 #include "config.h"
  43
  44 #include <sys/stat.h>
  45 #include <sys/types.h>
  46
  47 #ifdef HAVE_GETTIMEOFDAY
  48 # include <sys/time.h>
  49 #endif
  50
  51 #include <errno.h>
  52 #include <fcntl.h>
  53 #include <limits.h>
  54 #include <setjmp.h>
  55 #include <signal.h>
  56 #include <stdarg.h>
  57 #include <stdio.h>
  58 #include <stdlib.h>
  59 #include <string.h>
  60 #include <termios.h>
  61 #include <time.h>
  62 #include <unistd.h>
  63
  64 #if defined __STDC_VERSION__ && __STDC_VERSION__ + 0 >= 199901L
  65 # include <stdint.h>
  66 #else
  67 # include <inttypes.h>
  68 #endif
  69
  70 #ifdef HAVE_C90AMEND1
  71 # include <wchar.h>
  72 # include <wctype.h>
  73 #endif
  74 #ifdef HAVE_DEBUG
  75 # include <assert.h>
  76 #endif
  77 #ifdef HAVE_ICONV
  78 # include <iconv.h>
  79 #endif
  80 #ifdef HAVE_REGEX
  81 # include <regex.h>
  82 #endif
  83
  84 #ifdef HAVE_OPENSSL_MD5
  85 # include <openssl/md5.h>
  86 #endif
  87
  88 /*
  89  * Constants, some nail-specific macros
  90  */
  91
  92 #if !defined NI_MAXHOST
  93 # define NI_MAXHOST     1025
  94 #endif
  95
  96 /* TODO PATH_MAX: fixed-size buffer is always wrong (think NFS) */
  97 #ifndef PATH_MAX
  98 # ifdef MAXPATHLEN
  99 #  define PATH_MAX      MAXPATHLEN
 100 # else
 101 #  define PATH_MAX      1024        /* _XOPEN_PATH_MAX POSIX 2008/Cor 1-2013 */
 102 # endif
 103 #endif
 104
 105 #ifndef HOST_NAME_MAX
 106 # ifdef _POSIX_HOST_NAME_MAX
 107 #  define HOST_NAME_MAX _POSIX_HOST_NAME_MAX
 108 # else
 109 #  define HOST_NAME_MAX 255
 110 # endif
 111 #endif
 112
 113 #ifndef NAME_MAX
 114 # ifdef _POSIX_NAME_MAX
 115 #  define NAME_MAX      _POSIX_NAME_MAX
 116 # else
 117 #  define NAME_MAX      14
 118 # endif
 119 #endif
 120 #if NAME_MAX < 8
 121 # error NAME_MAX too small
 122 #endif
 123
 124 #ifndef STDIN_FILENO
 125 # define STDIN_FILENO   0
 126 #endif
 127 #ifndef STDOUT_FILENO
 128 # define STDOUT_FILENO  1
 129 #endif
 130 #ifndef STDERR_FILENO
 131 # define STDERR_FILENO  2
 132 #endif
 133
 134 #ifdef NSIG_MAX
 135 # undef NSIG
 136 # define NSIG           NSIG_MAX
 137 #elif !defined NSIG
 138 # define NSIG           ((sizeof(sigset_t) * 8) - 1)
 139 #endif
 140
 141 #ifdef O_CLOEXEC
 142 # define _O_CLOEXEC        O_CLOEXEC
 143 # define _CLOEXEC_SET(FD)  do {;} while(0)
 144 #else
 145 # define _O_CLOEXEC        0
 146 # define _CLOEXEC_SET(FD)  \
 147    do { (void)fcntl((FD), F_SETFD, FD_CLOEXEC); } while (0)
 148 #endif
 149
 150 /*  */
 151
 152 #if BUFSIZ + 0 > 2560               /* TODO simply use BUFSIZ? */
 153 # define LINESIZE       BUFSIZ      /* max readable line width */
 154 #else
 155 # define LINESIZE       2560
 156 #endif
 157 #define BUFFER_SIZE     (BUFSIZ >= (1u << 13) ? BUFSIZ : (1u << 14))
 158
 159 /* Network protocol newline */
 160 #define NETNL           "\015\012"
 161 #define NETLINE(X)      X NETNL
 162
 163 /* Number of Not-Yet-Dead calls that are remembered */
 164 #if defined HAVE_DEBUG || defined HAVE_DEVEL || defined HAVE_NYD2
 165 # ifdef HAVE_NYD2
 166 #  define NYD_CALLS_MAX (25 * 84)
 167 # elif defined HAVE_DEVEL
 168 #  define NYD_CALLS_MAX (25 * 42)
 169 # else
 170 #  define NYD_CALLS_MAX (25 * 10)
 171 # endif
 172 #endif
 173
 174 #define APPEND                   /* New mail goes to end of mailbox */
 175 #define CBAD            (-15555)
 176 #define DOTLOCK_TRIES   5        /* Number of open(2) calls for dotlock */
 177 #define FILE_LOCK_TRIES 10       /* Maximum tries before file_lock() fails */
 178 #define ERRORS_MAX      1000     /* Maximum error ring entries TODO configable*/
 179 #define ESCAPE          '~'      /* Default escape for sending */
 180 #define FIO_STACK_SIZE  20       /* Maximum recursion for sourcing */
 181 #define HIST_SIZE       242      /* tty.c: history list default size */
 182 #define HSHSIZE         23       /* Hash prime TODO make dynamic, obsolete */
 183 #define MAXARGC         1024     /* Maximum list of raw strings */
 184 #define MAXEXP          25       /* Maximum expansion of aliases */
 185 #define PROMPT_BUFFER_SIZE 80    /* getprompt() bufsize (> 3!) */
 186 #define REFERENCES_MAX  20       /* Maximum entries in References: */
 187 #define FTMP_OPEN_TRIES 10       /* Maximum number of Ftmp() open(2) tries */
 188
 189 #define ACCOUNT_NULL    "null"   /* Name of "null" account */
 190 #define MAILRC          "~/.mailrc"
 191 #define NETRC           "~/.netrc"
 192 #define TMPDIR_FALLBACK "/tmp"
 193
 194 /* Some environment variables for pipe hooks */
 195 #define AGENT_USER      "NAIL_USER"
 196 #define AGENT_USER_ENC  "NAIL_USER_ENC"
 197 #define AGENT_HOST      "NAIL_HOST"
 198 #define AGENT_HOST_PORT "NAIL_HOST_PORT"
 199
 200 /* Colour stuff */
 201 #ifdef HAVE_COLOUR
 202 # define n_COLOUR(X)       X
 203 #else
 204 # define n_COLOUR(X)
 205 #endif
 206
 207 /* Special FD requests for run_command() / start_command() */
 208 #define COMMAND_FD_PASS -1
 209 #define COMMAND_FD_NULL -2
 210
 211 /*  */
 212 #define FROM_DATEBUF    64    /* Size of RFC 4155 From_ line date */
 213 #define DATE_DAYSYEAR   365L
 214 #define DATE_SECSMIN    60L
 215 #define DATE_MINSHOUR   60L
 216 #define DATE_HOURSDAY   24L
 217 #define DATE_SECSDAY    (DATE_SECSMIN * DATE_MINSHOUR * DATE_HOURSDAY)
 218
 219 /* *indentprefix* default as of POSIX */
 220 #define INDENT_DEFAULT  "\t"
 221
 222 /* Default *encoding* as enum mime_enc below */
 223 #define MIME_DEFAULT_ENCODING MIMEE_QP
 224
 225 /* Maximum allowed line length in a mail before QP folding is necessary), and
 226  * the real limit we go for */
 227 #define MIME_LINELEN_MAX   998   /* Plus CRLF */
 228 #define MIME_LINELEN_LIMIT (MIME_LINELEN_MAX - 48)
 229
 230 /* Ditto, SHOULD */
 231 #define MIME_LINELEN    78    /* Plus CRLF */
 232
 233 /* And in headers which contain an encoded word according to RFC 2047 there is
 234  * yet another limit; also RFC 2045: 6.7, (5). */
 235 #define MIME_LINELEN_RFC2047 76
 236
 237 /* Locations of mime.types(5) */
 238 #define MIME_TYPES_USR  "~/.mime.types"
 239 #define MIME_TYPES_SYS  "/etc/mime.types"
 240
 241 /* Fallback MIME charsets, if *charset-7bit* and *charset-8bit* or not set.
 242  * (Keep in SYNC: ./nail.1:"Character sets", ./nail.h:CHARSET_*!) */
 243 #define CHARSET_7BIT    "US-ASCII"
 244 #ifdef HAVE_ICONV
 245 # define CHARSET_8BIT      "UTF-8"
 246 # define CHARSET_8BIT_OKEY charset_8bit
 247 #else
 248 # define CHARSET_8BIT      "ISO-8859-1"
 249 # define CHARSET_8BIT_OKEY ttycharset
 250 #endif
 251
 252 /* Some environment variables for pipe hooks etc. */
 253 #define NAILENV_TMPDIR              "NAIL_TMPDIR"
 254 #define NAILENV_FILENAME            "NAIL_FILENAME"
 255 #define NAILENV_FILENAME_GENERATED  "NAIL_FILENAME_GENERATED"
 256 #define NAILENV_FILENAME_TEMPORARY  "NAIL_FILENAME_TEMPORARY"
 257 #define NAILENV_CONTENT             "NAIL_CONTENT"
 258 #define NAILENV_CONTENT_EVIDENCE    "NAIL_CONTENT_EVIDENCE"
 259
 260 /* Is *W* a quoting (ASCII only) character? */
 261 #define ISQUOTE(W)      \
 262    ((W) == L'>' || (W) == L'|' || (W) == L'}' || (W) == L':')
 263
 264 /* Maximum number of quote characters (not bytes!) that'll be used on
 265  * follow lines when compressing leading quote characters */
 266 #define QUOTE_MAX       42
 267
 268 /* How much spaces should a <tab> count when *quote-fold*ing? (power-of-two!) */
 269 #define QUOTE_TAB_SPACES 8
 270
 271 /* Maximum size of a message that is passed through to the spam system */
 272 #define SPAM_MAXSIZE    420000
 273
 274 /* String dope: dynamic buffer size, and size of the single builtin one that's
 275  * used first; note that these value include the size of the structure */
 276 #define SBUFFER_SIZE    ((0x10000u >> 1u) - 0x400)
 277 #define SBUFFER_BUILTIN (0x10000u >> 1u)
 278
 279 /* Switch indicating necessity of terminal access interface (termcap.c) */
 280 #if defined HAVE_TERMCAP || defined HAVE_COLOUR || defined HAVE_MLE
 281 # define n_HAVE_TCAP
 282 #endif
 283
 284 /* These come from the configuration (named Xxy to not clash with sh(1)..) */
 285 #ifndef XSHELL
 286 # define XSHELL         "/bin/sh"
 287 #endif
 288 #ifndef XLISTER
 289 # define XLISTER        "ls"
 290 #endif
 291 #ifndef XPAGER
 292 # define XPAGER         "more"
 293 #endif
 294
 295 /*
 296  * OS, CC support, generic macros etc.
 297  */
 298
 299 /* OS: we're not a library, only set what needs special treatment somewhere */
 300 #define OS_DRAGONFLY    0
 301 #define OS_SOLARIS      0
 302 #define OS_SUNOS        0
 303
 304 #ifdef __DragonFly__
 305 # undef OS_DRAGONFLY
 306 # define OS_DRAGONFLY   1
 307 #elif defined __solaris__ || defined __sun
 308 # if defined __SVR4 || defined __svr4__
 309 #  undef OS_SOLARIS
 310 #  define OS_SOLARIS    1
 311 # else
 312 #  undef OS_SUNOS
 313 #  define OS_SUNOS      1
 314 # endif
 315 #endif
 316
 317 /* CC */
 318 #define CC_CLANG           0
 319 #define PREREQ_CLANG(X,Y)  0
 320 #define CC_GCC             0
 321 #define PREREQ_GCC(X,Y)    0
 322 #define CC_TCC             0
 323 #define PREREQ_TCC(X,Y)    0
 324
 325 #ifdef __clang__
 326 # undef CC_CLANG
 327 # undef PREREQ_CLANG
 328 # define CC_CLANG          1
 329 # define PREREQ_CLANG(X,Y) \
 330    (__clang_major__ + 0 > (X) || \
 331     (__clang_major__ + 0 == (X) && __clang_minor__ + 0 >= (Y)))
 332 # define __EXTEN           __extension__
 333
 334 #elif defined __GNUC__
 335 # undef CC_GCC
 336 # undef PREREQ_GCC
 337 # define CC_GCC            1
 338 # define PREREQ_GCC(X,Y)   \
 339    (__GNUC__ + 0 > (X) || (__GNUC__ + 0 == (X) && __GNUC_MINOR__ + 0 >= (Y)))
 340 # define __EXTEN           __extension__
 341
 342 #elif defined __TINYC__
 343 # undef CC_TCC
 344 # define CC_TCC            1
 345 #endif
 346
 347 #ifndef __EXTEN
 348 # define __EXTEN
 349 #endif
 350
 351 /* Suppress some technical warnings via #pragma's unless developing.
 352  * XXX Wild guesses: clang(1) 1.7 and (OpenBSD) gcc(1) 4.2.1 don't work */
 353 #ifndef HAVE_DEVEL
 354 # if PREREQ_CLANG(3, 4)
 355 #  pragma clang diagnostic ignored "-Wunused-result"
 356 #  pragma clang diagnostic ignored "-Wformat"
 357 # elif PREREQ_GCC(4, 7)
 358 #  pragma GCC diagnostic ignored "-Wunused-local-typedefs"
 359 #  pragma GCC diagnostic ignored "-Wunused-result"
 360 #  pragma GCC diagnostic ignored "-Wformat"
 361 # endif
 362 #endif
 363
 364 /* For injection macros like DBG(), NATCH_CHAR() */
 365 #define COMMA           ,
 366
 367 #define EMPTY_FILE()    typedef int CONCAT(avoid_empty_file__, n_FILE);
 368
 369 /* Pointer to size_t */
 370 #define PTR2SIZE(X)     ((size_t)(uintptr_t)(X))
 371
 372 /* Pointer comparison (types from below) */
 373 #define PTRCMP(A,C,B)   ((uintptr_t)(A) C (uintptr_t)(B))
 374
 375 /* Ditto, compare (maybe mixed-signed) integers cases to T bits, unsigned;
 376  * Note: doesn't sign-extend correctly, that's still up to the caller */
 377 #define UICMP(T,A,C,B)  ((ui ## T ## _t)(A) C (ui ## T ## _t)(B))
 378
 379 /* Align something to a size/boundary that cannot cause just any problem */
 380 #define n_ALIGN(X)      (((X) + 2*sizeof(void*)) & ~((2*sizeof(void*)) - 1))
 381
 382 /* Members in constant array */
 383 #ifndef NELEM
 384 # define NELEM(A)       (sizeof(A) / sizeof(A[0]))
 385 #endif
 386
 387 /* sizeof() for member fields */
 388 #define SIZEOF_FIELD(T,F) sizeof(((T *)NULL)->F)
 389
 390 /* Casts-away (*NOT* cast-away) */
 391 #define UNUSED(X)       ((void)(X))
 392 #define UNCONST(P)      ((void*)(uintptr_t)(void const*)(P))
 393 #define UNVOLATILE(P)   ((void*)(uintptr_t)(void volatile*)(P))
 394 #define UNXXX(T,C,P)    ((T)(uintptr_t)(C)(P))
 395
 396 /* __STDC_VERSION__ is ISO C99, so also use __STDC__, which should work */
 397 #if defined __STDC__ || defined __STDC_VERSION__ /*|| defined __cplusplus*/
 398 # define STRING(X)      #X
 399 # define XSTRING(X)     STRING(X)
 400 # define CONCAT(S1,S2)  _CONCAT(S1, S2)
 401 # define _CONCAT(S1,S2) S1 ## S2
 402 #else
 403 # define STRING(X)      "X"
 404 # define XSTRING        STRING
 405 # define CONCAT(S1,S2)  S1/**/S2
 406 #endif
 407
 408 #if defined __STDC_VERSION__ && __STDC_VERSION__ + 0 >= 199901L
 409 # define n_FIELD_INITN(N) CONCAT(., N) =
 410 # define n_FIELD_INITI(I) [I] =
 411 #else
 412 # define n_FIELD_INITN(N)
 413 # define n_FIELD_INITI(N)
 414 #endif
 415
 416 #if defined __STDC_VERSION__ && __STDC_VERSION__ + 0 >= 199901L
 417 # define VFIELD_SIZE(X)
 418 # define VFIELD_SIZEOF(T,F) (0)
 419 # define VSTRUCT_SIZEOF(T,F) sizeof(T)
 420 #else
 421 # define VFIELD_SIZE(X) \
 422   ((X) == 0 ? sizeof(size_t) \
 423    : ((ssize_t)(X) < 0 ? sizeof(size_t) - ABS(X) : (size_t)(X)))
 424 # define VFIELD_SIZEOF(T,F) SIZEOF_FIELD(T, F)
 425 # define VSTRUCT_SIZEOF(T,F) (sizeof(T) - SIZEOF_FIELD(T, F))
 426 #endif
 427
 428 #ifdef HAVE_INLINE
 429 # define SINLINE        n_INLINE /* TODO obsolete */
 430 #else
 431 # define SINLINE        static
 432 #endif
 433
 434 #undef __FUN__
 435 #if defined __STDC_VERSION__ && __STDC_VERSION__ + 0 >= 199901L
 436 # define __FUN__        __func__
 437 #elif CC_CLANG || PREREQ_GCC(3, 4)
 438 # define __FUN__        __extension__ __FUNCTION__
 439 #else
 440 # define __FUN__        uagent   /* Something that is not a literal */
 441 #endif
 442
 443 #if defined __predict_true && defined __predict_false
 444 # define LIKELY(X)      __predict_true(X)
 445 # define UNLIKELY(X)    __predict_false(X)
 446 #elif CC_CLANG || PREREQ_GCC(2, 96)
 447 # define LIKELY(X)      __builtin_expect(X, 1)
 448 # define UNLIKELY(X)    __builtin_expect(X, 0)
 449 #else
 450 # define LIKELY(X)      (X)
 451 # define UNLIKELY(X)    (X)
 452 #endif
 453
 454 #undef HAVE_NATCH_CHAR
 455 #undef NATCH_CHAR
 456 #if defined HAVE_SETLOCALE && defined HAVE_C90AMEND1 && defined HAVE_WCWIDTH
 457 # define HAVE_NATCH_CHAR
 458 # define NATCH_CHAR(X)  X
 459 #else
 460 # define NATCH_CHAR(X)
 461 #endif
 462
 463 /* Compile-Time-Assert
 464  * Problem is that some compilers warn on unused local typedefs, so add
 465  * a special local CTA to overcome this */
 466 #define CTA(TEST)       _CTA_1(TEST, n_FILE, __LINE__)
 467 #define LCTA(TEST)      _LCTA_1(TEST, n_FILE, __LINE__)
 468
 469 #if defined __STDC_VERSION__ && __STDC_VERSION__ + 0 >= 201112L
 470 # define n_CTA(T,M) _Static_assert(T, M)
 471 # define n_LCTA(T,M) _Static_assert(T, M)
 472 #else
 473 # define n_CTA(T,M)  _CTA_1(T, n_FILE, __LINE__)
 474 # define n_LCTA(T,M) _LCTA_1(T, n_FILE, __LINE__)
 475 #endif
 476 #define n_CTAV(T) n_CTA(T, "Unexpected value of constant")
 477 #define n_LCTAV(T) n_LCTA(T, "Unexpected value of constant")
 478
 479 #ifdef n_MAIN_SOURCE
 480 # define n_MCTA(T,M) n_CTA(T, M);
 481 #else
 482 # define n_MCTA(T,M)
 483 #endif
 484
 485 #define _CTA_1(T,F,L)   _CTA_2(T, F, L)
 486 #define _CTA_2(T,F,L)  \
 487    typedef char ASSERTION_failed_in_file_## F ## _at_line_ ## L[(T) ? 1 : -1]
 488 #define _LCTA_1(T,F,L)  _LCTA_2(T, F, L)
 489 #define _LCTA_2(T,F,L) \
 490 do {\
 491    typedef char ASSERTION_failed_in_file_## F ## _at_line_ ## L[(T) ? 1 : -1];\
 492    ASSERTION_failed_in_file_## F ## _at_line_ ## L __i_am_unused__;\
 493    UNUSED(__i_am_unused__);\
 494 } while (0)
 495
 496 #define UNINIT(N,V)     N = V
 497
 498 #undef ISPOW2
 499 #define ISPOW2(X)       ((((X) - 1) & (X)) == 0)
 500 #undef MIN
 501 #define MIN(A, B)       ((A) < (B) ? (A) : (B))
 502 #undef MAX
 503 #define MAX(A, B)       ((A) < (B) ? (B) : (A))
 504 #undef ABS
 505 #define ABS(A)          ((A) < 0 ? -(A) : (A))
 506
 507 #undef DBG
 508 #undef NDBG
 509 #ifndef HAVE_DEBUG
 510 # undef assert
 511 # define assert(X)      UNUSED(0)
 512 # define DBG(X)
 513 # define NDBG(X)        X
 514 # define DBGOR(X,Y)     Y
 515 #else
 516 # define DBG(X)         X
 517 # define NDBG(X)
 518 # define DBGOR(X,Y)     X
 519 #endif
 520
 521 /* Translation (init in main.c) */
 522 #undef _
 523 #undef N_
 524 #undef V_
 525 #define _(S)            S
 526 #define N_(S)           S
 527 #define V_(S)           S
 528
 529 /*
 530  * Types
 531  */
 532
 533 #ifdef UINT8_MAX
 534 # define UI8_MAX        UINT8_MAX
 535 # define SI8_MIN        INT8_MIN
 536 # define SI8_MAX        INT8_MAX
 537 typedef uint8_t         ui8_t;
 538 typedef int8_t          si8_t;
 539 #elif UCHAR_MAX != 255
 540 # error UCHAR_MAX must be 255
 541 #else
 542 # define UI8_MAX        UCHAR_MAX
 543 # define SI8_MIN        CHAR_MIN
 544 # define SI8_MAX        CHAR_MAX
 545 typedef unsigned char   ui8_t;
 546 typedef signed char     si8_t;
 547 #endif
 548
 549 #if !defined PRIu8 || !defined PRId8
 550 # undef PRIu8
 551 # undef PRId8
 552 # define PRIu8          "hhu"
 553 # define PRId8          "hhd"
 554 #endif
 555
 556 #ifdef UINT16_MAX
 557 # define UI16_MAX       UINT16_MAX
 558 # define SI16_MIN       INT16_MIN
 559 # define SI16_MAX       INT16_MAX
 560 typedef uint16_t        ui16_t;
 561 typedef int16_t         si16_t;
 562 #elif USHRT_MAX != 0xFFFFu
 563 # error USHRT_MAX must be 0xFFFF
 564 #else
 565 # define UI16_MAX       USHRT_MAX
 566 # define SI16_MIN       SHRT_MIN
 567 # define SI16_MAX       SHRT_MAX
 568 typedef unsigned short  ui16_t;
 569 typedef signed short    si16_t;
 570 #endif
 571
 572 #if !defined PRIu16 || !defined PRId16
 573 # undef PRIu16
 574 # undef PRId16
 575 # if UI16_MAX == UINT_MAX
 576 #  define PRIu16        "u"
 577 #  define PRId16        "d"
 578 # else
 579 #  define PRIu16        "hu"
 580 #  define PRId16        "hd"
 581 # endif
 582 #endif
 583
 584 #ifdef UINT32_MAX
 585 # define UI32_MAX       UINT32_MAX
 586 # define SI32_MIN       INT32_MIN
 587 # define SI32_MAX       INT32_MAX
 588 typedef uint32_t        ui32_t;
 589 typedef int32_t         si32_t;
 590 #elif ULONG_MAX == 0xFFFFFFFFu
 591 # define UI32_MAX       ULONG_MAX
 592 # define SI32_MIN       LONG_MIN
 593 # define SI32_MAX       LONG_MAX
 594 typedef unsigned long int  ui32_t;
 595 typedef signed long int    si32_t;
 596 #elif UINT_MAX != 0xFFFFFFFFu
 597 # error UINT_MAX must be 0xFFFFFFFF
 598 #else
 599 # define UI32_MAX       UINT_MAX
 600 # define SI32_MIN       INT_MIN
 601 # define SI32_MAX       INT_MAX
 602 typedef unsigned int    ui32_t;
 603 typedef signed int      si32_t;
 604 #endif
 605
 606 #if !defined PRIu32 || !defined PRId32
 607 # undef PRIu32
 608 # undef PRId32
 609 # if UI32_MAX == ULONG_MAX
 610 #  define PRIu32        "lu"
 611 #  define PRId32        "ld"
 612 # else
 613 #  define PRIu32        "u"
 614 #  define PRId32        "d"
 615 # endif
 616 #endif
 617
 618 #ifdef UINT64_MAX
 619 # define UI64_MAX       UINT64_MAX
 620 # define SI64_MIN       INT64_MIN
 621 # define SI64_MAX       INT64_MAX
 622 typedef uint64_t        ui64_t;
 623 typedef int64_t         si64_t;
 624 #elif ULONG_MAX <= 0xFFFFFFFFu
 625 # if !defined ULLONG_MAX || (ULLONG_MAX >> 31) < 0xFFFFFFFFu
 626 #  error We need a 64 bit integer
 627 # else
 628 #  define UI64_MAX      ULLONG_MAX
 629 #  define SI64_MIN      LLONG_MIN
 630 #  define SI64_MAX      LLONG_MAX
 631 __EXTEN typedef unsigned long long  ui64_t;
 632 __EXTEN typedef signed long long    si64_t;
 633 # endif
 634 #else
 635 # define UI64_MAX       ULONG_MAX
 636 # define SI64_MIN       LONG_MIN
 637 # define SI64_MAX       LONG_MAX
 638 typedef unsigned long   ui64_t;
 639 typedef signed long     si64_t;
 640 #endif
 641
 642 #if !defined PRIu64 || !defined PRId64 || !defined PRIX64
 643 # undef PRIu64
 644 # undef PRId64
 645 # undef PRIX64
 646 # if defined ULLONG_MAX && UI64_MAX == ULLONG_MAX
 647 #  define PRIu64        "llu"
 648 #  define PRId64        "lld"
 649 #  define PRIX64        "llX"
 650 # else
 651 #  define PRIu64        "lu"
 652 #  define PRId64        "ld"
 653 #  define PRIX64        "lX"
 654 # endif
 655 #endif
 656
 657 /* (So that we can use UICMP() for size_t comparison, too) */
 658 typedef size_t          uiz_t;
 659 typedef ssize_t         siz_t;
 660
 661 #undef PRIuZ
 662 #undef PRIdZ
 663 #if defined __STDC_VERSION__ && __STDC_VERSION__ + 0 >= 199901L
 664 # define PRIuZ          "zu"
 665 # define PRIdZ          "zd"
 666 # define UIZ_MAX        SIZE_MAX
 667 #elif defined SIZE_MAX
 668   /* UnixWare has size_t as unsigned as required but uses a signed limit
 669    * constant (which is thus false!) */
 670 # if SIZE_MAX == UI64_MAX || SIZE_MAX == SI64_MAX
 671 #  define PRIuZ         PRIu64
 672 #  define PRIdZ         PRId64
 673 n_MCTA(sizeof(size_t) == sizeof(ui64_t),
 674    "Format string mismatch, compile with ISO C99 compiler (-std=c99)!")
 675 # elif SIZE_MAX == UI32_MAX || SIZE_MAX == SI32_MAX
 676 #  define PRIuZ         PRIu32
 677 #  define PRIdZ         PRId32
 678 n_MCTA(sizeof(size_t) == sizeof(ui32_t),
 679    "Format string mismatch, compile with ISO C99 compiler (-std=c99)!")
 680 # else
 681 #  error SIZE_MAX is neither UI64_MAX nor UI32_MAX (please report this)
 682 # endif
 683 # define UIZ_MAX        SIZE_MAX
 684 #endif
 685 #ifndef PRIuZ
 686 # define PRIuZ          "lu"
 687 # define PRIdZ          "ld"
 688 n_MCTA(sizeof(size_t) == sizeof(unsigned long),
 689    "Format string mismatch, compile with ISO C99 compiler (-std=c99)!")
 690 # define UIZ_MAX        ULONG_MAX
 691 #endif
 692
 693 #ifndef UINTPTR_MAX
 694 # ifdef SIZE_MAX
 695 #  define uintptr_t     size_t
 696 #  define UINTPTR_MAX   SIZE_MAX
 697 # else
 698 #  define uintptr_t     unsigned long
 699 #  define UINTPTR_MAX   ULONG_MAX
 700 # endif
 701 #endif
 702
 703 #if !defined PRIuPTR || !defined PRIXPTR
 704 # undef PRIuPTR
 705 # undef PRIXPTR
 706 # if UINTPTR_MAX == ULONG_MAX
 707 #  define PRIuPTR       "lu"
 708 #  define PRIXPTR       "lX"
 709 # else
 710 #  define PRIuPTR       "u"
 711 #  define PRIXPTR       "X"
 712 # endif
 713 #endif
 714
 715 enum {FAL0, TRU1, TRUM1 = -1};
 716 typedef si8_t           bool_t;
 717
 718 /* Add shorter aliases for "normal" integers */
 719 typedef unsigned long   ul_i;
 720 typedef unsigned int    ui_i;
 721 typedef unsigned short  us_i;
 722 typedef unsigned char   uc_i;
 723
 724 typedef signed long     sl_i;
 725 typedef signed int      si_i;
 726 typedef signed short    ss_i;
 727 typedef signed char     sc_i;
 728
 729 typedef void (          *sighandler_type)(int);
 730
 731 enum authtype {
 732    AUTHTYPE_NONE     = 1<<0,
 733    AUTHTYPE_PLAIN    = 1<<1,  /* POP3: APOP is covered by this */
 734    AUTHTYPE_LOGIN    = 1<<2,
 735    AUTHTYPE_CRAM_MD5 = 1<<3,
 736    AUTHTYPE_GSSAPI   = 1<<4
 737 };
 738
 739 enum expand_addr_flags {
 740    EAF_NONE       = 0,        /* -> EAF_NOFILE | EAF_NOPIPE */
 741    EAF_RESTRICT   = 1<<0,     /* "restrict" (do unless interaktive / -[~#]) */
 742    EAF_FAIL       = 1<<1,     /* "fail" */
 743    /* Bits reused by enum expand_addr_check_mode! */
 744    EAF_FILE       = 1<<3,     /* +"file" targets */
 745    EAF_PIPE       = 1<<4,     /* +"pipe" command pipe targets */
 746    EAF_NAME       = 1<<5,     /* +"name"s (non-address) names / MTA aliases */
 747    EAF_ADDR       = 1<<6,     /* +"addr" network address (contain "@") */
 748
 749    EAF_TARGET_MASK  = EAF_FILE | EAF_PIPE | EAF_NAME | EAF_ADDR,
 750    EAF_RESTRICT_TARGETS = EAF_NAME | EAF_ADDR /* (default set if not set) */
 751 };
 752
 753 enum expand_addr_check_mode {
 754    EACM_NONE      = 0,        /* Don't care about *expandaddr* */
 755    EACM_NORMAL    = 1<<0,     /* Use our normal *expandaddr* checking */
 756    EACM_STRICT    = 1<<1,     /* Never allow any file or pipe addresse */
 757    EACM_MODE_MASK = 0x3,      /* _NORMAL and _STRICT are mutual! */
 758
 759    EACM_NOLOG     = 1<<2,     /* Don't log check errors */
 760
 761    /* Some special overwrites of EAF_TARGETs.
 762     * May NOT clash with EAF_* bits which may be ORd to these here! */
 763
 764    EACM_NONAME    = 1<<16
 765 };
 766
 767 #ifdef HAVE_COLOUR
 768 /* We do have several contexts of colour IDs; since only one of them can be
 769  * active at any given time let's share the value range */
 770 enum n_colour_ctx{
 771    n_COLOUR_CTX_SUM,
 772    n_COLOUR_CTX_VIEW,
 773    n_COLOUR_CTX_MLE,
 774    n__COLOUR_CTX_MAX
 775 };
 776
 777 enum n_colour_id{
 778    /* Header summary */
 779    n_COLOUR_ID_SUM_DOTMARK = 0,
 780    n_COLOUR_ID_SUM_HEADER,
 781    n_COLOUR_ID_SUM_THREAD,
 782
 783    /* Message display */
 784    n_COLOUR_ID_VIEW_FROM_ = 0,
 785    n_COLOUR_ID_VIEW_HEADER,
 786    n_COLOUR_ID_VIEW_MSGINFO,
 787    n_COLOUR_ID_VIEW_PARTINFO,
 788
 789    /* Mailx-Line-Editor */
 790    n_COLOUR_ID_MLE_POSITION = 0,
 791    n_COLOUR_ID_MLE_PROMPT,
 792
 793    n__COLOUR_IDS = n_COLOUR_ID_VIEW_PARTINFO + 1
 794 };
 795
 796 /* Colour preconditions, let's call them tags, cannot be an enum because for
 797  * message display they are the actual header name of the current header.  Thus
 798  * let's use constants of pseudo pointers */
 799 # define n_COLOUR_TAG_SUM_DOT ((char*)-2)
 800 # define n_COLOUR_TAG_SUM_OLDER ((char*)-3)
 801 #endif /* HAVE_COLOUR */
 802
 803 enum conversion {
 804    CONV_NONE,        /* no conversion */
 805    CONV_7BIT,        /* no conversion, is 7bit */
 806    CONV_FROMQP,      /* convert from quoted-printable */
 807    CONV_TOQP,        /* convert to quoted-printable */
 808    CONV_8BIT,        /* convert to 8bit (iconv) */
 809    CONV_FROMB64,     /* convert from base64 */
 810    CONV_FROMB64_T,   /* convert from base64/text */
 811    CONV_TOB64,       /* convert to base64 */
 812    CONV_FROMHDR,     /* convert from RFC1522 format */
 813    CONV_TOHDR,       /* convert to RFC1522 format */
 814    CONV_TOHDR_A      /* convert addresses for header */
 815 };
 816
 817 enum cproto {
 818    CPROTO_SMTP,
 819    CPROTO_POP3
 820 };
 821
 822 enum dotlock_state {
 823    DLS_NONE,
 824    DLS_CANT_CHDIR,            /* Failed to chdir(2) into desired path */
 825    DLS_NAMETOOLONG,           /* Lock file name would be too long */
 826    DLS_ROFS,                  /* Read-only filesystem (no error, mailbox RO) */
 827    DLS_NOPERM,                /* No permission to creat lock file */
 828    DLS_NOEXEC,                /* Privilege separated dotlocker not found */
 829    DLS_PRIVFAILED,            /* Rising privileges failed in dotlocker */
 830    DLS_EXIST,                 /* Lock file already exists, stale lock? */
 831    DLS_FISHY,                 /* Something makes us think bad of situation */
 832    DLS_DUNNO,                 /* Catch-all error */
 833    DLS_PING,                  /* Not an error, but have to wait for lock */
 834    DLS_ABANDON    = 1<<7      /* ORd to any but _NONE: give up, don't retry */
 835 };
 836
 837 enum exit_status {
 838    EXIT_OK        = EXIT_SUCCESS,
 839    EXIT_ERR       = EXIT_FAILURE,
 840    EXIT_USE       = 64,       /* sysexits.h:EX_USAGE */
 841    EXIT_NOUSER    = 67,       /* :EX_NOUSER */
 842    EXIT_COLL_ABORT = 1<<1,    /* Message collection was aborted */
 843    EXIT_SEND_ERROR = 1<<2     /* Unspecified send error occurred */
 844 };
 845
 846 enum fedit_mode {
 847    FEDIT_NONE     = 0,
 848    FEDIT_SYSBOX   = 1<<0,     /* %: prefix */
 849    FEDIT_RDONLY   = 1<<1,     /* Readonly (per-box, OPT_R_FLAG is global) */
 850    FEDIT_NEWMAIL  = 1<<2      /* `newmail' operation TODO OBSOLETE THIS! */
 851 };
 852
 853 enum fexp_mode {
 854    FEXP_FULL,                 /* Full expansion */
 855    FEXP_LOCAL     = 1<<0,     /* Result must be local file/maildir */
 856    FEXP_SHELL     = 1<<1,     /* No folder %,#,&,+ stuff, yet sh(1) */
 857    FEXP_NSHORTCUT = 1<<2,     /* Don't expand shortcuts */
 858    FEXP_SILENT    = 1<<3,     /* Don't print but only return errors */
 859    FEXP_MULTIOK   = 1<<4,     /* Expansion to many entries is ok */
 860    FEXP_NSHELL    = 1<<5      /* Don't do shell word exp. (but ~/, $VAR) */
 861 };
 862
 863 enum file_lock_type {
 864    FLT_READ,
 865    FLT_WRITE
 866 };
 867
 868 enum mimecontent {
 869    MIME_UNKNOWN,     /* unknown content */
 870    MIME_SUBHDR,      /* inside a multipart subheader */
 871    MIME_822,         /* message/rfc822 content */
 872    MIME_MESSAGE,     /* other message/ content */
 873    MIME_TEXT_PLAIN,  /* text/plain content */
 874    MIME_TEXT_HTML,   /* text/html content */
 875    MIME_TEXT,        /* other text/ content */
 876    MIME_ALTERNATIVE, /* multipart/alternative content */
 877    MIME_RELATED,     /* mime/related (RFC 2387) */
 878    MIME_DIGEST,      /* multipart/digest content */
 879    MIME_MULTI,       /* other multipart/ content */
 880    MIME_PKCS7,       /* PKCS7 content */
 881    MIME_DISCARD      /* content is discarded */
 882 };
 883
 884 enum mime_counter_evidence {
 885    MIMECE_NONE,
 886    MIMECE_SET        = 1<<0,  /* *mime-counter-evidence* was set */
 887    MIMECE_BIN_OVWR   = 1<<1,  /* appli../octet-stream: check, ovw if possible */
 888    MIMECE_ALL_OVWR   = 1<<2,  /* all: check, ovw if possible */
 889    MIMECE_BIN_PARSE  = 1<<3   /* appli../octet-stream: classify contents last */
 890 };
 891
 892 /* Content-Transfer-Encodings as defined in RFC 2045:
 893  * - Quoted-Printable, section 6.7
 894  * - Base64, section 6.8 */
 895 #define QP_LINESIZE     (4 * 19)       /* Max. compliant QP linesize */
 896
 897 #define B64_LINESIZE    (4 * 19)       /* Max. compliant Base64 linesize */
 898 #define B64_ENCODE_INPUT_PER_LINE 57   /* Max. input for Base64 encode/line */
 899
 900 enum mime_enc {
 901    MIMEE_NONE,       /* message is not in MIME format */
 902    MIMEE_BIN,        /* message is in binary encoding */
 903    MIMEE_8B,         /* message is in 8bit encoding */
 904    MIMEE_7B,         /* message is in 7bit encoding */
 905    MIMEE_QP,         /* message is quoted-printable */
 906    MIMEE_B64         /* message is in base64 encoding */
 907 };
 908
 909 /* xxx QP came later, maybe rewrite all to use mime_enc_flags directly? */
 910 enum mime_enc_flags {
 911    MIMEEF_NONE,
 912    MIMEEF_SALLOC     = 1<<0,  /* Use salloc(), not srealloc().. */
 913    /* ..result .s,.l point to user buffer of *_LINESIZE+[+[+]] bytes instead */
 914    MIMEEF_BUF        = 1<<1,
 915    MIMEEF_CRLF       = 1<<2,  /* (encode) Append "\r\n" to lines */
 916    MIMEEF_LF         = 1<<3,  /* (encode) Append "\n" to lines */
 917    /* (encode) If one of _CRLF/_LF is set, honour *_LINESIZE+[+[+]] and
 918     * inject the desired line-ending whenever a linewrap is desired */
 919    MIMEEF_MULTILINE  = 1<<4,
 920    /* (encode) Quote with header rules, do not generate soft NL breaks?
 921     * For mustquote(), specifies wether special RFC 2047 header rules
 922     * should be used instead */
 923    MIMEEF_ISHEAD     = 1<<5,
 924    /* (encode) Ditto; for mustquote() this furtherly fine-tunes behaviour in
 925     * that characters which would not be reported as "must-quote" when
 926     * detecting wether quoting is necessary at all will be reported as
 927     * "must-quote" if they have to be encoded in an encoded word */
 928    MIMEEF_ISENCWORD  = 1<<6,
 929    __MIMEEF_LAST     = 6
 930 };
 931
 932 enum qpflags {
 933    QP_NONE        = MIMEEF_NONE,
 934    QP_SALLOC      = MIMEEF_SALLOC,
 935    QP_BUF         = MIMEEF_BUF,
 936    QP_ISHEAD      = MIMEEF_ISHEAD,
 937    QP_ISENCWORD   = MIMEEF_ISENCWORD
 938 };
 939
 940 enum b64flags {
 941    B64_NONE       = MIMEEF_NONE,
 942    B64_SALLOC     = MIMEEF_SALLOC,
 943    B64_BUF        = MIMEEF_BUF,
 944    B64_CRLF       = MIMEEF_CRLF,
 945    B64_LF         = MIMEEF_LF,
 946    B64_MULTILINE  = MIMEEF_MULTILINE,
 947    /* Not used, but for clarity only */
 948    B64_ISHEAD     = MIMEEF_ISHEAD,
 949    B64_ISENCWORD  = MIMEEF_ISENCWORD,
 950    /* Special version of Base64, "Base64URL", according to RFC 4648.
 951     * Only supported for encoding! */
 952    B64_RFC4648URL = 1<<(__MIMEEF_LAST+1),
 953    /* Don't use any ("=") padding;
 954     * may NOT be used with any of _CRLF, _LF or _MULTILINE */
 955    B64_NOPAD      = 1<<(__MIMEEF_LAST+2)
 956 };
 957
 958 enum mime_parse_flags {
 959    MIME_PARSE_NONE      = 0,
 960    MIME_PARSE_DECRYPT   = 1<<0,
 961    MIME_PARSE_PARTS     = 1<<1
 962 };
 963
 964 enum mime_handler_flags {
 965    MIME_HDL_NULL,                /* No pipe- mimetype handler, go away */
 966    MIME_HDL_CMD,                 /* Normal command */
 967    MIME_HDL_TEXT,                /* @ special cmd to force treatment as text */
 968    MIME_HDL_PTF,                 /* A special pointer-to-function handler */
 969    MIME_HDL_MSG,                 /* Display msg (returned as command string) */
 970    MIME_HDL_TYPE_MASK   = 7,
 971    MIME_HDL_ISQUOTE     = 1<<4,  /* Is quote action (we have info, keep it!) */
 972    MIME_HDL_NOQUOTE     = 1<<5,  /* No MIME for quoting */
 973    MIME_HDL_ALWAYS      = 1<<6,  /* Handler shall run for multi-msg actions */
 974    MIME_HDL_ASYNC       = 1<<7,  /* Should run asynchronously */
 975    MIME_HDL_NEEDSTERM   = 1<<8,  /* Takes over terminal */
 976    MIME_HDL_TMPF        = 1<<9,  /* Create temporary file (zero-sized) */
 977    MIME_HDL_TMPF_FILL   = 1<<10, /* Fill in the msg body content */
 978    MIME_HDL_TMPF_UNLINK = 1<<11  /* Delete it later again */
 979 };
 980
 981 enum mlist_state {
 982    MLIST_OTHER       = 0,     /* Normal address */
 983    MLIST_KNOWN       = 1,     /* A known `mlist' */
 984    MLIST_SUBSCRIBED  = -1     /* A `mlsubscribe'd list */
 985 };
 986
 987 enum oflags {
 988    OF_RDONLY      = 1<<0,
 989    OF_WRONLY      = 1<<1,
 990    OF_RDWR        = 1<<2,
 991    OF_APPEND      = 1<<3,
 992    OF_CREATE      = 1<<4,
 993    OF_TRUNC       = 1<<5,
 994    OF_EXCL        = 1<<6,
 995    OF_CLOEXEC     = 1<<7,     /* TODO not used, always implied!  CHANGE!! */
 996    OF_UNLINK      = 1<<8,     /* Only for Ftmp(): unlink(2) after creation */
 997    OF_HOLDSIGS    = 1<<9,     /* Mutual with OF_UNLINK - await Ftmp_free() */
 998    OF_REGISTER    = 1<<10,    /* Register file in our file table */
 999    OF_REGISTER_UNLINK = 1<<11, /* unlink(2) upon unreg.; _REGISTER asserted! */
1000    OF_SUFFIX      = 1<<12     /* Ftmp() name hint is mandatory! extension! */
1001 };
1002
1003 enum okay {
1004    STOP = 0,
1005    OKAY = 1
1006 };
1007
1008 enum okey_xlook_mode {
1009    OXM_PLAIN      = 1<<0,     /* Plain key always tested */
1010    OXM_H_P        = 1<<1,     /* Check PLAIN-.url_h_p */
1011    OXM_U_H_P      = 1<<2,     /* Check PLAIN-.url_u_h_p */
1012    OXM_ALL        = 0x7
1013 };
1014
1015 /* <0 means "stop" unless *prompt* extensions are enabled. */
1016 enum prompt_exp {
1017    PROMPT_STOP    = -1,       /* \c */
1018    /* *prompt* extensions: \$, \@ etc. */
1019    PROMPT_DOLLAR  = -2,
1020    PROMPT_AT      = -3
1021 };
1022
1023 enum protocol {
1024    PROTO_FILE,       /* refers to a local file */
1025    PROTO_POP3,       /* is a pop3 server string */
1026    PROTO_MAILDIR,    /* refers to a maildir folder */
1027    PROTO_UNKNOWN     /* unknown protocol */
1028 };
1029
1030 enum sendaction {
1031    SEND_MBOX,        /* no conversion to perform */
1032    SEND_RFC822,      /* no conversion, no From_ line */
1033    SEND_TODISP,      /* convert to displayable form */
1034    SEND_TODISP_ALL,  /* same, include all MIME parts */
1035    SEND_SHOW,        /* convert to 'show' command form */
1036    SEND_TOSRCH,      /* convert for IMAP SEARCH */
1037    SEND_TOFILE,      /* convert for saving body to a file */
1038    SEND_TOPIPE,      /* convert for pipe-content/subc. */
1039    SEND_QUOTE,       /* convert for quoting */
1040    SEND_QUOTE_ALL,   /* same, include all MIME parts */
1041    SEND_DECRYPT      /* decrypt */
1042 };
1043
1044 enum n_sigman_flags{
1045    n_SIGMAN_NONE = 0,
1046    n_SIGMAN_HUP = 1<<0,
1047    n_SIGMAN_INT = 1<<1,
1048    n_SIGMAN_QUIT = 1<<2,
1049    n_SIGMAN_TERM = 1<<3,
1050    n_SIGMAN_PIPE = 1<<4,
1051
1052    n_SIGMAN_IGN_HUP = 1<<5,
1053    n_SIGMAN_IGN_INT = 1<<6,
1054    n_SIGMAN_IGN_QUIT = 1<<7,
1055    n_SIGMAN_IGN_TERM = 1<<8,
1056
1057    n_SIGMAN_ALL = 0xFF,
1058    /* Mostly for _leave() reraise flags */
1059    n_SIGMAN_VIPSIGS = n_SIGMAN_HUP | n_SIGMAN_INT | n_SIGMAN_QUIT |
1060          n_SIGMAN_TERM,
1061    n_SIGMAN_NTTYOUT_PIPE = 1<<16,
1062    n_SIGMAN_VIPSIGS_NTTYOUT = n_SIGMAN_HUP | n_SIGMAN_INT | n_SIGMAN_QUIT |
1063          n_SIGMAN_TERM | n_SIGMAN_NTTYOUT_PIPE,
1064
1065    n__SIGMAN_PING = 1<<17
1066 };
1067
1068 #ifdef HAVE_SSL
1069 enum ssl_verify_level {
1070    SSL_VERIFY_IGNORE,
1071    SSL_VERIFY_WARN,
1072    SSL_VERIFY_ASK,
1073    SSL_VERIFY_STRICT
1074 };
1075 #endif
1076
1077 enum tdflags {
1078    TD_NONE,                   /* no display conversion */
1079    TD_ISPR        = 1<<0,     /* use isprint() checks */
1080    TD_ICONV       = 1<<1,     /* use iconv() */
1081    TD_DELCTRL     = 1<<2,     /* delete control characters */
1082
1083    /*
1084     * NOTE: _TD_EOF and _TD_BUFCOPY may be ORd with enum conversion and
1085     * enum sendaction, and may thus NOT clash with their bit range!
1086     */
1087    _TD_EOF        = 1<<14,    /* EOF seen, last round! */
1088    _TD_BUFCOPY    = 1<<15     /* Buffer may be constant, copy it */
1089 };
1090
1091 #ifdef n_HAVE_TCAP
1092 enum n_termcap_captype{
1093    n_TERMCAP_CAPTYPE_NONE = 0,
1094    /* Internally we share the bitspace, so ensure no value ends up as 0 */
1095    n_TERMCAP_CAPTYPE_BOOL = 1,
1096    n_TERMCAP_CAPTYPE_NUMERIC,
1097    n_TERMCAP_CAPTYPE_STRING,
1098    n__TERMCAP_CAPTYPE_MAX
1099 };
1100
1101 /* Termcap commands; different to queries commands perform actions.
1102  * Commands are resolved upon init time, and are all termcap(5)-compatible,
1103  * therefore we use the short termcap(5) names.
1104  * Note this is parsed by mk-tcap-map.pl, which expects the syntax
1105  * "CONSTANT, COMMENT" where COMMENT is "Capname/TCap-Code, TYPE[, FLAGS]",
1106  * and one of Capname and TCap-Code may be the string "-" meaning ENOENT;
1107  * a | vertical bar or end-of-comment ends processing; see termcap.c.
1108  * We may use the free-form part after | for the "Variable String" and notes on
1109  * necessary termcap_cmd() arguments; if those are in [] brackets they are not
1110  * regular but are only used when the command, i.e., its effect, is somehow
1111  * simulated / faked by a builtin fallback implementation.
1112  * Availability of builtin fallback indicated by leading @ (at-sign) */
1113 enum n_termcap_cmd{
1114 # ifdef HAVE_TERMCAP
1115    n_TERMCAP_CMD_te, /* rmcup/te, STRING | exit_ca_mode: -,- */
1116    n_TERMCAP_CMD_ti, /* smcup/ti, STRING | enter_ca_mode: -,- */
1117
1118    n_TERMCAP_CMD_ks, /* smkx/ks, STRING | keypad_xmit: -,- */
1119    n_TERMCAP_CMD_ke, /* rmkx/ke, STRING | keypad_local: -,- */
1120
1121    n_TERMCAP_CMD_cd, /* ed/cd, STRING | clr_eos: -,- */
1122    n_TERMCAP_CMD_cl, /* clear/cl, STRING | clear_screen(+home): -,- */
1123    n_TERMCAP_CMD_ho, /* home/ho, STRING | cursor_home: -,- */
1124 # endif
1125
1126 # ifdef HAVE_MLE
1127    n_TERMCAP_CMD_ce, /* el/ce, STRING | @ clr_eol: [start-column],- */
1128    n_TERMCAP_CMD_ch, /* hpa/ch, STRING, IDX1 | column_address: column,- */
1129    n_TERMCAP_CMD_cr, /* cr/cr, STRING | @ carriage_return: -,- */
1130    n_TERMCAP_CMD_le, /* cub1/le, STRING, CNT | @ cursor_left: count,- */
1131    n_TERMCAP_CMD_nd, /* cuf1/nd, STRING, CNT | @ cursor_right: count,- */
1132 # endif
1133
1134    n__TERMCAP_CMD_MAX,
1135    n__TERMCAP_CMD_MASK = (1<<24) - 1,
1136
1137    /* Only perform command if ca-mode is used */
1138    n_TERMCAP_CMD_FLAG_CA_MODE = 1<<29,
1139    /* I/O should be flushed after command completed */
1140    n_TERMCAP_CMD_FLAG_FLUSH = 1<<30
1141 };
1142
1143 /* Termcap queries; a query is a command that returns a struct n_termcap_value.
1144  * Queries are resolved once they are used first, and may not be termcap(5)-
1145  * compatible, therefore we use terminfo(5) names.
1146  * Note this is parsed by mk-tcap-map.pl, which expects the syntax
1147  * "CONSTANT, COMMENT" where COMMENT is "Capname/TCap-Code, TYPE[, FLAGS]",
1148  * and one of Capname and TCap-Code may be the string "-" meaning ENOENT;
1149  * a | vertical bar or end-of-comment ends processing; see termcap.c.
1150  * We may use the free-form part after | for the "Variable String" and notes.
1151  * The "xkey | X:" keys are Dickey's xterm extensions, see (our) manual */
1152 enum n_termcap_query{
1153 # ifdef HAVE_COLOUR
1154    n_TERMCAP_QUERY_colors, /* colors/Co, NUMERIC | max_colors */
1155 # endif
1156
1157    /* --mk-tcap-map--: only KEY_BINDINGS follow.  DON'T CHANGE THIS LINE! */
1158    /* Update the `bind' manual on change! */
1159 # ifdef HAVE_KEY_BINDINGS
1160    n_TERMCAP_QUERY_key_backspace, /* kbs/kb, STRING */
1161    n_TERMCAP_QUERY_key_dc,       /* kdch1/kD, STRING | delete-character */
1162       n_TERMCAP_QUERY_key_sdc,      /* kDC / *4, STRING | ..shifted */
1163    n_TERMCAP_QUERY_key_eol,      /* kel/kE, STRING | clear-to-end-of-line */
1164    n_TERMCAP_QUERY_key_exit,     /* kext/@9, STRING */
1165    n_TERMCAP_QUERY_key_ic,       /* kich1/kI, STRING | insert character */
1166       n_TERMCAP_QUERY_key_sic,      /* kIC/#3, STRING | ..shifted */
1167    n_TERMCAP_QUERY_key_home,     /* khome/kh, STRING */
1168       n_TERMCAP_QUERY_key_shome,    /* kHOM/#2, STRING | ..shifted */
1169    n_TERMCAP_QUERY_key_end,      /* kend/@7, STRING */
1170       n_TERMCAP_QUERY_key_send,     /* kEND / *7, STRING | ..shifted */
1171    n_TERMCAP_QUERY_key_npage,    /* knp/kN, STRING */
1172    n_TERMCAP_QUERY_key_ppage,    /* kpp/kP, STRING */
1173    n_TERMCAP_QUERY_key_left,     /* kcub1/kl, STRING */
1174       n_TERMCAP_QUERY_key_sleft,    /* kLFT/#4, STRING | ..shifted */
1175       n_TERMCAP_QUERY_xkey_aleft,   /* kLFT3/-, STRING | X: Alt+left */
1176       n_TERMCAP_QUERY_xkey_cleft,   /* kLFT5/-, STRING | X: Control+left */
1177    n_TERMCAP_QUERY_key_right,    /* kcuf1/kr, STRING */
1178       n_TERMCAP_QUERY_key_sright,   /* kRIT/%i, STRING | ..shifted */
1179       n_TERMCAP_QUERY_xkey_aright,  /* kRIT3/-, STRING | X: Alt+right */
1180       n_TERMCAP_QUERY_xkey_cright,  /* kRIT5/-, STRING | X: Control+right */
1181    n_TERMCAP_QUERY_key_down,     /* kcud1/kd, STRING */
1182       n_TERMCAP_QUERY_xkey_sdown,   /* kDN/-, STRING | ..shifted */
1183       n_TERMCAP_QUERY_xkey_adown,   /* kDN3/-, STRING | X: Alt+down */
1184       n_TERMCAP_QUERY_xkey_cdown,   /* kDN5/-, STRING | X: Control+down */
1185    n_TERMCAP_QUERY_key_up,       /* kcuu1/ku, STRING */
1186       n_TERMCAP_QUERY_xkey_sup,     /* kUP/-, STRING | ..shifted */
1187       n_TERMCAP_QUERY_xkey_aup,     /* kUP3/-, STRING | X: Alt+up */
1188       n_TERMCAP_QUERY_xkey_cup,     /* kUP5/-, STRING | X: Control+up */
1189    n_TERMCAP_QUERY_kf0,          /* kf0/k0, STRING */
1190    n_TERMCAP_QUERY_kf1,          /* kf1/k1, STRING */
1191    n_TERMCAP_QUERY_kf2,          /* kf2/k2, STRING */
1192    n_TERMCAP_QUERY_kf3,          /* kf3/k3, STRING */
1193    n_TERMCAP_QUERY_kf4,          /* kf4/k4, STRING */
1194    n_TERMCAP_QUERY_kf5,          /* kf5/k5, STRING */
1195    n_TERMCAP_QUERY_kf6,          /* kf6/k6, STRING */
1196    n_TERMCAP_QUERY_kf7,          /* kf7/k7, STRING */
1197    n_TERMCAP_QUERY_kf8,          /* kf8/k8, STRING */
1198    n_TERMCAP_QUERY_kf9,          /* kf9/k9, STRING */
1199    n_TERMCAP_QUERY_kf10,         /* kf10/k;, STRING */
1200    n_TERMCAP_QUERY_kf11,         /* kf11/F1, STRING */
1201    n_TERMCAP_QUERY_kf12,         /* kf12/F2, STRING */
1202    n_TERMCAP_QUERY_kf13,         /* kf13/F3, STRING */
1203    n_TERMCAP_QUERY_kf14,         /* kf14/F4, STRING */
1204    n_TERMCAP_QUERY_kf15,         /* kf15/F5, STRING */
1205    n_TERMCAP_QUERY_kf16,         /* kf16/F6, STRING */
1206    n_TERMCAP_QUERY_kf17,         /* kf17/F7, STRING */
1207    n_TERMCAP_QUERY_kf18,         /* kf18/F8, STRING */
1208    n_TERMCAP_QUERY_kf19,         /* kf19/F9, STRING */
1209 # endif /* HAVE_KEY_BINDINGS */
1210
1211    n__TERMCAP_QUERY_MAX
1212 };
1213 #endif /* n_HAVE_TCAP */
1214
1215 enum user_options {
1216    OPT_NONE,
1217    OPT_DEBUG      = 1u<< 0,   /* -d / *debug* */
1218    OPT_VERB       = 1u<< 1,   /* -v / *verbose* */
1219    OPT_VERBVERB   = 1u<< 2,   /* .. even more verbosity */
1220    OPT_EXISTONLY  = 1u<< 3,   /* -e */
1221    OPT_HEADERSONLY = 1u<<4,   /* -H */
1222    OPT_HEADERLIST = 1u<< 5,   /* -L */
1223    OPT_QUICKRUN_MASK = OPT_EXISTONLY | OPT_HEADERSONLY | OPT_HEADERLIST,
1224    OPT_E_FLAG     = 1u<< 7,   /* -E / *skipemptybody* */
1225    OPT_F_FLAG     = 1u<< 8,   /* -F */
1226    OPT_N_FLAG     = 1u<< 9,   /* -N / *header* */
1227    OPT_R_FLAG     = 1u<<10,   /* -R */
1228    OPT_r_FLAG     = 1u<<11,   /* -r (plus option_r_arg) */
1229    OPT_t_FLAG     = 1u<<12,   /* -t */
1230    OPT_u_FLAG     = 1u<<13,   /* -u / $USER and pw->pw_uid != getuid(2) */
1231    OPT_TILDE_FLAG = 1u<<14,   /* -~ */
1232    OPT_BATCH_FLAG = 1u<<15,   /* -# */
1233
1234    /*  */
1235    OPT_MEMDEBUG   = 1<<16,    /* *memdebug* */
1236
1237    /*  */
1238    OPT_SENDMODE   = 1u<<17,   /* Usage case forces send mode */
1239    OPT_TTYIN      = 1u<<18,
1240    OPT_TTYOUT     = 1u<<19,
1241    OPT_INTERACTIVE = 1u<<20,
1242    OPT_UNICODE    = 1u<<21,   /* We're in an UTF-8 environment */
1243    OPT_ENC_MBSTATE = 1u<<22,  /* Multibyte environment with shift states */
1244
1245    /* Some easy-access shortcuts */
1246    OPT_D_V        = OPT_DEBUG | OPT_VERB,
1247    OPT_D_VV       = OPT_DEBUG | OPT_VERBVERB,
1248    OPT_D_V_VV     = OPT_DEBUG | OPT_VERB | OPT_VERBVERB
1249 };
1250
1251 #define OBSOLETE(X) \
1252 do {\
1253    if (options & OPT_D_V_VV)\
1254       n_err("%s: %s\n", _("Obsoletion warning"), X);\
1255 } while (0)
1256 #define OBSOLETE2(X,Y) \
1257 do {\
1258    if (options & OPT_D_V_VV)\
1259       n_err("%s: %s: %s\n", _("Obsoletion warning"), X, Y);\
1260 } while (0)
1261
1262 enum program_state {
1263    PS_NONE           = 0,
1264    PS_STARTED        = 1<< 0,       /* main.c startup code passed, functional */
1265
1266    PS_LOADING        = 1<< 1,       /* Loading user resource files, startup */
1267    PS_SOURCING       = 1<< 2,       /* Sourcing a resource file */
1268    PS_IN_LOAD        = PS_LOADING | PS_SOURCING,
1269    PS_PIPING         = 1<< 3,       /* `source'ing via pipe */
1270
1271    PS_EVAL_ERROR     = 1<< 4,       /* Last evaluate() command failed */
1272
1273    PS_HOOK_NEWMAIL   = 1<< 6,
1274    PS_HOOK           = 1<< 7,
1275    PS_HOOK_MASK      = PS_HOOK_NEWMAIL | PS_HOOK,
1276
1277    PS_EDIT           = 1<< 8,       /* Current mailbox not a "system mailbox" */
1278    PS_SETFILE_OPENED = 1<< 9,       /* (hack) setfile() opened a new box */
1279    PS_SAW_COMMAND    = 1<<10,       /* ..after mailbox switch */
1280
1281    PS_DID_PRINT_DOT  = 1<<16,       /* Current message has been printed */
1282
1283    PS_MSGLIST_SAW_NO = 1<<17,       /* Last *LIST saw numerics */
1284    PS_MSGLIST_DIRECT = 1<<18,       /* One msg was directly chosen by number */
1285    PS_MSGLIST_MASK   = PS_MSGLIST_SAW_NO | PS_MSGLIST_DIRECT,
1286
1287    PS_HEADER_NEEDED_MIME = 1<<20,   /* mime_write_tohdr() needed x TODO HACK! */
1288
1289    PS_COLOUR_ACTIVE  = 1<<22,       /* n_colour_env_create().._gut() cycle */
1290
1291    /* Various first-time-init switches */
1292    PS_ERRORS_NOTED   = 1<<24,       /* Ring of `errors' content, print msg */
1293    PS_ATTACHMENTS_NOTED = 1<<25,    /* Attachment filename quoting noted */
1294    PS_t_FLAG         = 1<<26,       /* OPT_t_FLAG made persistant */
1295    PS_TERMCAP_DISABLE = 1<<27,      /* HAVE_TERMCAP: *termcap-disable* was set */
1296    PS_TERMCAP_CA_MODE = 1<<28,      /* HAVE_TERMCAP: ca_mode available & used */
1297    PS_HISTORY_LOADED = 1<<29        /* Command line editor history loaded */
1298 };
1299
1300 /* A large enum with all the boolean and value options a.k.a their keys.
1301  * Only the constant keys are in here, to be looked up via ok_[bv]look(),
1302  * ok_[bv]set() and ok_[bv]clear().
1303  * Note: see the comments in accmacvar.c before changing *anything* in here! */
1304 enum okeys {
1305    /* TODO likely temporary hook data, v15 drop */
1306    ok_v_on_compose_enter,
1307    ok_v_on_compose_leave,
1308    ok_v_compose_from,
1309    ok_v_compose_sender,
1310    ok_v_compose_to,
1311    ok_v_compose_cc,
1312    ok_v_compose_bcc,
1313    ok_v_compose_subject,
1314
1315    ok_b_add_file_recipients,
1316    ok_v_agent_shell_lookup,
1317    ok_b_allnet,
1318    ok_b_append,
1319    ok_b_ask,
1320    ok_b_askatend,
1321    ok_b_askattach,
1322    ok_b_askbcc,
1323    ok_b_askcc,
1324    ok_b_asksign,
1325    ok_b_asksub,
1326    ok_b_attachment_ask_content_description,
1327    ok_b_attachment_ask_content_disposition,
1328    ok_b_attachment_ask_content_id,
1329    ok_b_attachment_ask_content_type,
1330    ok_v_attrlist,
1331    ok_v_autobcc,
1332    ok_v_autocc,
1333    ok_b_autocollapse,
1334    ok_b_autoprint,
1335 ok_b_autothread,
1336    ok_v_autosort,
1337
1338    ok_b_bang,
1339    ok_b_batch_exit_on_error,
1340    ok_b_bsdannounce,
1341    ok_b_bsdcompat,
1342    ok_b_bsdflags,
1343    ok_b_bsdheadline,
1344    ok_b_bsdmsgs,
1345    ok_b_bsdorder,
1346    ok_b_bsdset,
1347
1348    ok_v_charset_7bit,
1349    ok_v_charset_8bit,
1350    ok_v_charset_unknown_8bit,
1351    ok_v_cmd,
1352    ok_b_colour_disable,
1353    ok_b_colour_pager,
1354    ok_v_crt,
1355    ok_v_customhdr,
1356
1357    ok_v_DEAD,
1358    ok_v_datefield,
1359    ok_v_datefield_markout_older,
1360    ok_b_debug,                         /* {special=1} */
1361    ok_b_disposition_notification_send,
1362    ok_b_dot,
1363    ok_b_dotlock_ignore_error,
1364
1365    ok_v_EDITOR,
1366    ok_b_editalong,
1367    ok_b_editheaders,
1368 ok_b_emptybox,
1369    ok_b_emptystart,
1370    ok_v_encoding,
1371    ok_v_escape,
1372    ok_v_expandaddr,
1373    ok_v_expandargv,
1374
1375    ok_v_features,                      /* {rdonly=1,virtual=_features} */
1376    ok_b_flipr,
1377    ok_v_folder,                        /* {special=1} */
1378    ok_v_folder_hook,
1379    ok_b_followup_to,
1380    ok_v_followup_to_honour,
1381    ok_b_forward_as_attachment,
1382    ok_v_from,
1383    ok_b_fullnames,
1384    ok_v_fwdheading,
1385
1386    ok_b_header,                        /* {special=1} */
1387    ok_v_headline,
1388    ok_v_headline_bidi,
1389    ok_v_history_file,
1390    ok_b_history_gabby,
1391    ok_b_history_gabby_persist,
1392    ok_v_history_size,
1393    ok_b_hold,
1394    ok_v_hostname,
1395
1396    ok_b_idna_disable,
1397    ok_b_ignore,
1398    ok_b_ignoreeof,
1399    ok_v_indentprefix,
1400
1401    ok_b_keep,
1402    ok_b_keep_content_length,
1403    ok_b_keepsave,
1404
1405    ok_v_LISTER,
1406    ok_b_line_editor_disable,
1407
1408    ok_v_MAIL,
1409    ok_v_MBOX,
1410    ok_b_markanswered,
1411    ok_b_mbox_rfc4155,
1412    ok_b_memdebug,                      /* {special=1} */
1413    ok_b_message_id_disable,
1414    ok_v_message_inject_head,
1415    ok_v_message_inject_tail,
1416    ok_b_metoo,
1417    ok_b_mime_allow_text_controls,
1418    ok_b_mime_alternative_favour_rich,
1419    ok_v_mime_counter_evidence,
1420    ok_v_mimetypes_load_control,
1421
1422    ok_v_NAIL_EXTRA_RC,                 /* {name=NAIL_EXTRA_RC} */
1423 ok_v_NAIL_HEAD,                     /* {name=NAIL_HEAD} */
1424 ok_v_NAIL_HISTFILE,                 /* {name=NAIL_HISTFILE} */
1425 ok_v_NAIL_HISTSIZE,                 /* {name=NAIL_HISTSIZE} */
1426 ok_v_NAIL_TAIL,                     /* {name=NAIL_TAIL} */
1427    ok_b_netrc_lookup,
1428    ok_v_newfolders,
1429    ok_v_newmail,
1430
1431    ok_b_outfolder,
1432
1433    ok_v_PAGER,
1434    ok_b_page,
1435    ok_v_password,
1436    ok_b_piperaw,
1437    ok_v_pop3_auth,
1438    ok_b_pop3_bulk_load,
1439    ok_v_pop3_keepalive,
1440    ok_b_pop3_no_apop,
1441    ok_b_pop3_use_starttls,
1442    ok_b_print_alternatives,
1443    ok_v_prompt,
1444
1445    ok_b_quiet,
1446    ok_v_quote,
1447    ok_b_quote_as_attachment,
1448    ok_v_quote_fold,
1449
1450    ok_b_recipients_in_cc,
1451    ok_v_record,
1452    ok_b_record_resent,
1453    ok_b_reply_in_same_charset,
1454    ok_v_reply_strings,
1455    ok_v_replyto,
1456    ok_v_reply_to_honour,
1457    ok_b_rfc822_body_from_,             /* {name=rfc822-body-from_} */
1458
1459    ok_v_SHELL,
1460    ok_b_save,
1461    ok_v_screen,
1462    ok_b_searchheaders,
1463    ok_v_sendcharsets,
1464    ok_b_sendcharsets_else_ttycharset,
1465    ok_v_sender,
1466    ok_v_sendmail,
1467    ok_v_sendmail_arguments,
1468    ok_b_sendmail_no_default_arguments,
1469    ok_v_sendmail_progname,
1470    ok_b_sendwait,
1471    ok_b_showlast,
1472    ok_b_showname,
1473    ok_b_showto,
1474    ok_v_Sign,
1475    ok_v_sign,
1476    ok_v_signature,
1477    ok_b_skipemptybody,                 /* {special=1} */
1478    ok_v_smime_ca_dir,
1479    ok_v_smime_ca_file,
1480    ok_v_smime_cipher,
1481    ok_v_smime_crl_dir,
1482    ok_v_smime_crl_file,
1483    /* smime-encrypt-USER@HOST */
1484    ok_b_smime_force_encryption,
1485    ok_b_smime_no_default_ca,
1486    ok_b_smime_sign,
1487    ok_v_smime_sign_cert,
1488    ok_v_smime_sign_include_certs,
1489    ok_v_smime_sign_message_digest,
1490    ok_v_smtp,
1491    ok_v_smtp_auth,
1492 ok_v_smtp_auth_password,
1493 ok_v_smtp_auth_user,
1494    ok_v_smtp_hostname,
1495    ok_b_smtp_use_starttls,
1496    ok_v_spam_interface,
1497    ok_v_spam_maxsize,
1498    ok_v_spamc_command,
1499    ok_v_spamc_arguments,
1500    ok_v_spamc_user,
1501    ok_v_spamd_socket,
1502    ok_v_spamd_user,
1503    ok_v_spamfilter_ham,
1504    ok_v_spamfilter_noham,
1505    ok_v_spamfilter_nospam,
1506    ok_v_spamfilter_rate,
1507    ok_v_spamfilter_rate_scanscore,
1508    ok_v_spamfilter_spam,
1509    ok_v_ssl_ca_dir,
1510    ok_v_ssl_ca_file,
1511    ok_v_ssl_cert,
1512    ok_v_ssl_cipher_list,
1513    ok_v_ssl_config_file,
1514    ok_v_ssl_crl_dir,
1515    ok_v_ssl_crl_file,
1516    ok_v_ssl_key,
1517    ok_v_ssl_method,
1518    ok_b_ssl_no_default_ca,
1519    ok_v_ssl_protocol,
1520    ok_v_ssl_rand_egd,
1521    ok_v_ssl_rand_file,
1522    ok_v_ssl_verify,
1523    ok_v_stealthmua,
1524
1525    ok_v_termcap,
1526    ok_b_termcap_disable,
1527    ok_v_toplines,
1528    ok_v_ttycharset,
1529
1530    ok_v_user,
1531
1532    ok_v_VISUAL,
1533    ok_b_v15_compat,
1534    ok_b_verbose,                       /* {special=1} */
1535    ok_v_version,                       /* {rdonly=1,virtual=VERSION} */
1536    ok_v_version_major,                 /* {rdonly=1,virtual=VERSION_MAJOR} */
1537    ok_v_version_minor,                 /* {rdonly=1,virtual=VERSION_MINOR} */
1538    ok_v_version_update,                /* {rdonly=1,virtual=VERSION_UPDATE} */
1539
1540    ok_b_writebackedited
1541 };
1542
1543 /* Locale-independent character classes */
1544 enum {
1545    C_CNTRL        = 0000,
1546    C_BLANK        = 0001,
1547    C_WHITE        = 0002,
1548    C_SPACE        = 0004,
1549    C_PUNCT        = 0010,
1550    C_OCTAL        = 0020,
1551    C_DIGIT        = 0040,
1552    C_UPPER        = 0100,
1553    C_LOWER        = 0200
1554 };
1555
1556 struct str {
1557    char     *s;      /* the string's content */
1558    size_t   l;       /* the stings's length */
1559 };
1560
1561 struct n_string{
1562    char *s_dat;         /*@ May contain NULs, not automatically terminated */
1563    ui32_t s_len;        /*@ gth of string */
1564 #ifdef HAVE_BYTE_ORDER_LITTLE
1565    ui32_t s_auto : 1;   /* Stored in auto-reclaimed storage? */
1566 #endif
1567    ui32_t s_size : 31;  /* of .s_dat, -1 */
1568 #ifndef HAVE_BYTE_ORDER_LITTLE
1569    ui32_t s_auto : 1;
1570 #endif
1571 };
1572
1573 struct bidi_info {
1574    struct str  bi_start;      /* Start of (possibly) bidirectional text */
1575    struct str  bi_end;        /* End of ... */
1576    size_t      bi_pad;        /* No of visual columns to reserve for BIDI pad */
1577 };
1578
1579 #ifdef HAVE_COLOUR
1580 struct n_colour_pen;
1581 #endif
1582
1583 struct url {
1584    char const     *url_input;       /* Input as given (really) */
1585    enum cproto    url_cproto;       /* Communication protocol as given */
1586    bool_t         url_needs_tls;    /* Wether the protocol uses SSL/TLS */
1587    bool_t         url_had_user;     /* Wether .url_user was part of the URL */
1588    ui16_t         url_portno;       /* atoi .url_port or default, host endian */
1589    char const     *url_port;        /* Port (if given) or NULL */
1590    char           url_proto[14];    /* Communication protocol as 'xy\0//' */
1591    ui8_t          url_proto_len;    /* Length of .url_proto ('\0' index) */
1592    ui8_t          url_proto_xlen;   /* .. if '\0' is replaced with ':' */
1593    struct str     url_user;         /* User, exactly as given / looked up */
1594    struct str     url_user_enc;     /* User, urlxenc()oded */
1595    struct str     url_pass;         /* Pass (urlxdec()oded) or NULL */
1596    struct str     url_host;         /* Service hostname */
1597    struct str     url_path;         /* Path suffix or NULL */
1598    /* TODO: url_get_component(url *, enum COMPONENT, str *store) */
1599    struct str     url_h_p;          /* .url_host[:.url_port] */
1600    /* .url_user@.url_host
1601     * Note: for CPROTO_SMTP this may resolve HOST via *smtp-hostname* (->
1602     * *hostname*)!  (And may later be overwritten according to *from*!) */
1603    struct str     url_u_h;
1604    struct str     url_u_h_p;        /* .url_user@.url_host[:.url_port] */
1605    struct str     url_eu_h_p;       /* .url_user_enc@.url_host[:.url_port] */
1606    char const     *url_p_u_h_p;     /* .url_proto://.url_u_h_p */
1607    char const     *url_p_eu_h_p;    /* .url_proto://.url_eu_h_p */
1608    char const     *url_p_eu_h_p_p;  /* .url_proto://.url_eu_h_p[/.url_path] */
1609 };
1610
1611 struct ccred {
1612    enum cproto    cc_cproto;     /* Communication protocol */
1613    enum authtype  cc_authtype;   /* Desired authentication */
1614    char const     *cc_auth;      /* Authentication type as string */
1615    struct str     cc_user;       /* User (urlxdec()oded) or NULL */
1616    struct str     cc_pass;       /* Password (urlxdec()oded) or NULL */
1617 };
1618
1619 #ifdef HAVE_DOTLOCK
1620 struct dotlock_info {
1621    char const  *di_file_name;    /* Mailbox to lock */
1622    char const  *di_lock_name;    /* .di_file_name + .lock */
1623    char const  *di_hostname;     /* ..filled in parent (due resolver delays) */
1624    char const  *di_randstr;      /* ..ditto, random string */
1625    size_t      di_pollmsecs;     /* Delay in between locking attempts */
1626    struct stat *di_stb;
1627 };
1628 #endif
1629
1630 struct mime_handler {
1631    enum mime_handler_flags mh_flags;
1632    struct str  mh_msg;           /* Message describing this command */
1633    /* XXX union{} the following? */
1634    char const  *mh_shell_cmd;    /* For MIME_HDL_CMD */
1635    int         (*mh_ptf)(void);  /* PTF main() for MIME_HDL_PTF */
1636 };
1637
1638 struct quoteflt {
1639    FILE        *qf_os;        /* Output stream */
1640    char const  *qf_pfix;
1641    ui32_t      qf_pfix_len;   /* Length of prefix: 0: bypass */
1642    ui32_t      qf_qfold_min;  /* Simple way: wrote prefix? */
1643 #ifdef HAVE_QUOTE_FOLD
1644    ui32_t      qf_qfold_max;  /* Otherwise: line lengths */
1645    ui8_t       qf_state;      /* *quote-fold* state machine */
1646    bool_t      qf_brk_isws;   /* Breakpoint is at WS */
1647    ui8_t       __dummy[2];
1648    ui32_t      qf_wscnt;      /* Whitespace count */
1649    ui32_t      qf_brkl;       /* Breakpoint */
1650    ui32_t      qf_brkw;       /* Visual width, breakpoint */
1651    ui32_t      qf_datw;       /* Current visual output line width */
1652    struct str  qf_dat;        /* Current visual output line */
1653    struct str  qf_currq;      /* Current quote, compressed */
1654    mbstate_t   qf_mbps[2];
1655 #endif
1656 };
1657
1658 #ifdef HAVE_FILTER_HTML_TAGSOUP
1659 struct htmlflt {
1660    FILE        *hf_os;        /* Output stream */
1661    ui32_t      hf_flags;
1662    ui32_t      hf_lmax;       /* Maximum byte +1 in .hf_line/4 */
1663    ui32_t      hf_len;        /* Current bytes in .hf_line */
1664    ui32_t      hf_last_ws;    /* Last whitespace on line (fold purposes) */
1665    ui32_t      hf_mboff;      /* Last offset for "mbtowc" */
1666    ui32_t      hf_mbwidth;    /* We count characters not bytes if possible */
1667    char        *hf_line;      /* Output line buffer - MUST be last field! */
1668    si32_t      hf_href_dist;  /* Count of lines since last HREF flush */
1669    ui32_t      hf_href_no;    /* HREF sequence number */
1670    struct htmlflt_href *hf_hrefs;
1671    struct htmlflt_tag const *hf_ign_tag; /* Tag that will end ignore mode */
1672    char        *hf_curr;      /* Current cursor into .hf_bdat */
1673    char        *hf_bmax;      /* Maximum byte in .hf_bdat +1 */
1674    char        *hf_bdat;      /* (Temporary) Tag content data storage */
1675 };
1676 #endif
1677
1678 struct search_expr {
1679    char const  *ss_where;     /* ..to search for the expr. (not always used) */
1680    char const  *ss_sexpr;     /* String search expr.; NULL: use .ss_regex */
1681 #ifdef HAVE_REGEX
1682    regex_t     ss_regex;
1683 #endif
1684 };
1685
1686 /* This is somewhat temporary for pre v15 */
1687 struct n_sigman{
1688    ui32_t sm_flags;           /* enum n_sigman_flags */
1689    int sm_signo;
1690    struct n_sigman *sm_outer;
1691    sighandler_type sm_ohup;
1692    sighandler_type sm_oint;
1693    sighandler_type sm_oquit;
1694    sighandler_type sm_oterm;
1695    sighandler_type sm_opipe;
1696    sigjmp_buf sm_jump;
1697 };
1698
1699 struct eval_ctx {
1700    struct str  ev_line;          /* The terminated data to evaluate */
1701    ui32_t      ev_line_size;     /* May be used to store line memory size */
1702    bool_t      ev_is_recursive;  /* Evaluation in evaluation? (collect ~:) */
1703    ui8_t       __dummy[3];
1704    bool_t      ev_add_history;   /* Enter (final) command in history? */
1705    char const  *ev_new_content;  /* History: reenter line, start with this */
1706 };
1707
1708 struct termios_state {
1709    struct termios ts_tios;
1710    char        *ts_linebuf;
1711    size_t      ts_linesize;
1712    bool_t      ts_needs_reset;
1713 };
1714
1715 #define termios_state_reset() \
1716 do {\
1717    if (termios_state.ts_needs_reset) {\
1718       tcsetattr(0, TCSADRAIN, &termios_state.ts_tios);\
1719       termios_state.ts_needs_reset = FAL0;\
1720    }\
1721 } while (0)
1722
1723 #ifdef n_HAVE_TCAP
1724 struct n_termcap_value{
1725    enum n_termcap_captype tv_captype;
1726    ui8_t tv__dummy[4];
1727    union n_termcap_value_data{
1728       bool_t tvd_bool;
1729       ui32_t tvd_numeric;
1730       char const *tvd_string;
1731    } tv_data;
1732 };
1733 #endif
1734
1735 struct time_current {
1736    time_t      tc_time;
1737    struct tm   tc_gm;
1738    struct tm   tc_local;
1739    char        tc_ctime[32];
1740 };
1741
1742 struct sock {                 /* data associated with a socket */
1743    int         s_fd;          /* file descriptor */
1744 #ifdef HAVE_SSL
1745    int         s_use_ssl;     /* SSL is used */
1746 # ifdef HAVE_OPENSSL
1747    void        *s_ssl;        /* SSL object */
1748 # endif
1749 #endif
1750    char        *s_wbuf;       /* for buffered writes */
1751    int         s_wbufsize;    /* allocated size of s_buf */
1752    int         s_wbufpos;     /* position of first empty data byte */
1753    char        *s_rbufptr;    /* read pointer to s_rbuf */
1754    int         s_rsz;         /* size of last read in s_rbuf */
1755    char const  *s_desc;       /* description of error messages */
1756    void        (*s_onclose)(void);     /* execute on close */
1757    char        s_rbuf[LINESIZE + 1];   /* for buffered reads */
1758 };
1759
1760 struct sockconn {
1761    struct url     sc_url;
1762    struct ccred   sc_cred;
1763    struct sock    sc_sock;
1764 };
1765
1766 struct mailbox {
1767    enum {
1768       MB_NONE     = 000,      /* no reply expected */
1769       MB_COMD     = 001,      /* command reply expected */
1770       MB_MULT     = 002,      /* multiline reply expected */
1771       MB_PREAUTH  = 004,      /* not in authenticated state */
1772       MB_BYE      = 010       /* may accept a BYE state */
1773    }           mb_active;
1774    FILE        *mb_itf;       /* temp file with messages, read open */
1775    FILE        *mb_otf;       /* same, write open */
1776    char        *mb_sorted;    /* sort method */
1777    enum {
1778       MB_VOID,       /* no type (e. g. connection failed) */
1779       MB_FILE,       /* local file */
1780       MB_POP3,       /* POP3 mailbox */
1781       MB_MAILDIR     /* maildir folder */
1782    }           mb_type;       /* type of mailbox */
1783    enum {
1784       MB_DELE = 01,  /* may delete messages in mailbox */
1785       MB_EDIT = 02   /* may edit messages in mailbox */
1786    }           mb_perm;
1787    int mb_threaded;           /* mailbox has been threaded */
1788    struct sock mb_sock;       /* socket structure */
1789 };
1790
1791 enum needspec {
1792    NEED_UNSPEC,      /* unspecified need, don't fetch */
1793    NEED_HEADER,      /* need the header of a message */
1794    NEED_BODY         /* need header and body of a message */
1795 };
1796
1797 enum havespec {
1798    HAVE_NOTHING,              /* nothing downloaded yet */
1799    HAVE_HEADER    = 01,       /* header is downloaded */
1800    HAVE_BODY      = 02        /* entire message is downloaded */
1801 };
1802
1803 /* flag bits. Attention: Flags that are used in cache.c may not change */
1804 enum mflag {
1805    MUSED          = (1<< 0),  /* entry is used, but this bit isn't */
1806    MDELETED       = (1<< 1),  /* entry has been deleted */
1807    MSAVED         = (1<< 2),  /* entry has been saved */
1808    MTOUCH         = (1<< 3),  /* entry has been noticed */
1809    MPRESERVE      = (1<< 4),  /* keep entry in sys mailbox */
1810    MMARK          = (1<< 5),  /* message is marked! */
1811    MODIFY         = (1<< 6),  /* message has been modified */
1812    MNEW           = (1<< 7),  /* message has never been seen */
1813    MREAD          = (1<< 8),  /* message has been read sometime. */
1814    MSTATUS        = (1<< 9),  /* message status has changed */
1815    MBOX           = (1<<10),  /* Send this to mbox, regardless */
1816    MNOFROM        = (1<<11),  /* no From line */
1817    MHIDDEN        = (1<<12),  /* message is hidden to user */
1818    MBOXED         = (1<<13),  /* message has been sent to mbox */
1819    MNEWEST        = (1<<14),  /* message is very new (newmail) */
1820    MFLAG          = (1<<15),  /* message has been flagged recently */
1821    MUNFLAG        = (1<<16),  /* message has been unflagged */
1822    MFLAGGED       = (1<<17),  /* message is `flagged' */
1823    MANSWER        = (1<<18),  /* message has been answered recently */
1824    MUNANSWER      = (1<<19),  /* message has been unanswered */
1825    MANSWERED      = (1<<20),  /* message is `answered' */
1826    MDRAFT         = (1<<21),  /* message has been drafted recently */
1827    MUNDRAFT       = (1<<22),  /* message has been undrafted */
1828    MDRAFTED       = (1<<23),  /* message is marked as `draft' */
1829    MOLDMARK       = (1<<24),  /* messages was marked previously */
1830    MSPAM          = (1<<25),  /* message is classified as spam */
1831    MSPAMUNSURE    = (1<<26)   /* message may be spam, but it is unsure */
1832 };
1833 #define MMNORM          (MDELETED | MSAVED | MHIDDEN)
1834 #define MMNDEL          (MDELETED | MHIDDEN)
1835
1836 #define visible(mp)     (((mp)->m_flag & MMNDEL) == 0)
1837
1838 struct mimepart {
1839    enum mflag  m_flag;        /* flags */
1840    enum havespec m_have;      /* downloaded parts of the part */
1841 #ifdef HAVE_SPAM
1842    ui32_t      m_spamscore;   /* Spam score as int, 24:8 bits */
1843 #endif
1844    int         m_block;       /* block number of this part */
1845    size_t      m_offset;      /* offset in block of part */
1846    size_t      m_size;        /* Bytes in the part */
1847    size_t      m_xsize;       /* Bytes in the full part */
1848    long        m_lines;       /* Lines in the message */
1849    long        m_xlines;      /* Lines in the full message */
1850    time_t      m_time;        /* time the message was sent */
1851    char const  *m_from;       /* message sender */
1852    struct mimepart *m_nextpart;     /* next part at same level */
1853    struct mimepart *m_multipart;    /* parts of multipart */
1854    struct mimepart *m_parent;       /* enclosing multipart part */
1855    char const  *m_ct_type;          /* content-type */
1856    char const  *m_ct_type_plain;    /* content-type without specs */
1857    char const  *m_ct_type_usr_ovwr; /* Forcefully overwritten one */
1858    enum mimecontent m_mimecontent;  /* same in enum */
1859    char const  *m_charset;    /* charset */
1860    char const  *m_ct_enc;     /* content-transfer-encoding */
1861    enum mime_enc m_mime_enc;     /* same in enum */
1862    char        *m_partstring; /* part level string */
1863    char        *m_filename;   /* attachment filename */
1864 };
1865
1866 struct message {
1867    enum mflag  m_flag;        /* flags */
1868    enum havespec m_have;      /* downloaded parts of the message */
1869 #ifdef HAVE_SPAM
1870    ui32_t      m_spamscore;   /* Spam score as int, 24:8 bits */
1871 #endif
1872    int         m_block;       /* block number of this message */
1873    size_t      m_offset;      /* offset in block of message */
1874    size_t      m_size;        /* Bytes in the message */
1875    size_t      m_xsize;       /* Bytes in the full message */
1876    long        m_lines;       /* Lines in the message */
1877    long        m_xlines;      /* Lines in the full message */
1878    time_t      m_time;        /* time the message was sent */
1879    time_t      m_date;        /* time in the 'Date' field */
1880    unsigned    m_idhash;      /* hash on Message-ID for threads */
1881    struct message *m_child;   /* first child of this message */
1882    struct message *m_younger; /* younger brother of this message */
1883    struct message *m_elder;   /* elder brother of this message */
1884    struct message *m_parent;  /* parent of this message */
1885    unsigned    m_level;       /* thread level of message */
1886    long        m_threadpos;   /* position in threaded display */
1887    char        *m_maildir_file;  /* original maildir file of msg */
1888    ui32_t      m_maildir_hash;   /* hash of file name in maildir sub */
1889    int         m_collapsed;      /* collapsed thread information */
1890 };
1891
1892 /* Given a file address, determine the block number it represents */
1893 #define mailx_blockof(off)                ((int) ((off) / 4096))
1894 #define mailx_offsetof(off)               ((int) ((off) % 4096))
1895 #define mailx_positionof(block, offset)   ((off_t)(block) * 4096 + (offset))
1896
1897 /* Argument types */
1898 enum argtype {
1899    ARG_MSGLIST    = 0,        /* Message list type */
1900    ARG_STRLIST    = 1,        /* A pure string */
1901    ARG_RAWLIST    = 2,        /* Shell string list */
1902    ARG_NOLIST     = 3,        /* Just plain 0 */
1903    ARG_NDMLIST    = 4,        /* Message list, no defaults */
1904    ARG_ECHOLIST   = 5,        /* Like raw list, but keep quote chars */
1905    ARG_ARGMASK    = 7,        /* Mask of the above */
1906
1907    ARG_A          = 1u<< 4,   /* Needs an active mailbox */
1908    ARG_F          = 1u<< 5,   /* Is a conditional command */
1909    ARG_H          = 1u<< 6,   /* Never place in history */
1910    ARG_I          = 1u<< 7,   /* Interactive command bit */
1911    ARG_M          = 1u<< 8,   /* Legal from send mode bit */
1912    ARG_P          = 1u<< 9,   /* Autoprint dot after command */
1913    ARG_R          = 1u<<10,   /* Cannot be called from collect / recursion */
1914    ARG_T          = 1u<<11,   /* Is a transparent command */
1915    ARG_V          = 1u<<12,   /* Places data in temporary_arg_v_store */
1916    ARG_W          = 1u<<13,   /* Invalid when read only bit */
1917    ARG_O          = 1u<<14    /* OBSOLETE()d command */
1918 };
1919
1920 enum gfield {
1921    GTO            = 1<< 0,    /* Grab To: line */
1922    GSUBJECT       = 1<< 1,    /* Likewise, Subject: line */
1923    GCC            = 1<< 2,    /* And the Cc: line */
1924    GBCC           = 1<< 3,    /* And also the Bcc: line */
1925
1926    GNL            = 1<< 4,    /* Print blank line after */
1927    GDEL           = 1<< 5,    /* Entity removed from list */
1928    GCOMMA         = 1<< 6,    /* detract() puts in commas */
1929    GUA            = 1<< 7,    /* User-Agent field */
1930    GMIME          = 1<< 8,    /* MIME 1.0 fields */
1931    GMSGID         = 1<< 9,    /* a Message-ID */
1932    GNAMEONLY      = 1<<10,    /* detract() does NOT use fullnames */
1933
1934    GIDENT         = 1<<11,    /* From:, Reply-To:, MFT: (user headers) */
1935    GREF           = 1<<12,    /* References:, In-Reply-To:, (Message-ID:) */
1936    GDATE          = 1<<13,    /* Date: field */
1937    GFULL          = 1<<14,    /* Include full names, comments etc. */
1938    GSKIN          = 1<<15,    /* Skin names */
1939    GEXTRA         = 1<<16,    /* Extra fields (mostly like GIDENT XXX) */
1940    GFILES         = 1<<17,    /* Include filename and pipe addresses */
1941    GFULLEXTRA     = 1<<18     /* Only with GFULL: GFULL less address */
1942 };
1943 #define GMASK           (GTO | GSUBJECT | GCC | GBCC)
1944
1945 enum header_flags {
1946    HF_NONE        = 0,
1947    HF_LIST_REPLY  = 1<< 0,
1948    HF_MFT_SENDER  = 1<< 1,    /* Add ourselves to Mail-Followup-To: */
1949    HF_RECIPIENT_RECORD = 1<<10, /* Save message in file named after rec. */
1950    HF__NEXT_SHIFT = 11
1951 };
1952
1953 /* Structure used to pass about the current state of a message (header) */
1954 struct n_header_field{
1955    struct n_header_field *hf_next;
1956    ui32_t hf_nl;              /* Field-name length */
1957    ui32_t hf_bl;              /* Field-body length*/
1958    char hf_dat[VFIELD_SIZE(0)];
1959 };
1960
1961 struct header {
1962    ui32_t      h_flags;       /* enum header_flags bits */
1963    ui32_t      h_dummy;
1964    struct name *h_to;         /* Dynamic "To:" string */
1965    char        *h_subject;    /* Subject string */
1966    struct name *h_cc;         /* Carbon copies string */
1967    struct name *h_bcc;        /* Blind carbon copies */
1968    struct name *h_ref;        /* References (possibly overridden) */
1969    struct attachment *h_attach; /* MIME attachments */
1970    char        *h_charset;    /* preferred charset */
1971    struct name *h_from;       /* overridden "From:" field */
1972    struct name *h_sender;     /* overridden "Sender:" field */
1973    struct name *h_replyto;    /* overridden "Reply-To:" field */
1974    struct name *h_message_id; /* overridden "Message-ID:" field */
1975    struct name *h_in_reply_to;/* overridden "In-Reply-To:" field */
1976    struct name *h_mft;        /* Mail-Followup-To */
1977    char const  *h_list_post;  /* Address from List-Post:, for `Lreply' */
1978    struct n_header_field *h_user_headers;
1979    struct n_header_field *h_custom_headers; /* (Cached result) */
1980 };
1981
1982 /* Handling of namelist nodes used in processing the recipients of mail and
1983  * aliases, inspection of mail-addresses and all that kind of stuff */
1984 enum nameflags {
1985    NAME_NAME_SALLOC        = 1<< 0, /* .n_name is doped */
1986    NAME_FULLNAME_SALLOC    = 1<< 1, /* .n_fullname is doped */
1987    NAME_SKINNED            = 1<< 2, /* Is actually skin()ned */
1988    NAME_IDNA               = 1<< 3, /* IDNA was applied */
1989
1990    NAME_ADDRSPEC_CHECKED   = 1<< 4, /* Address has been .. and */
1991    NAME_ADDRSPEC_ISFILE    = 1<< 5, /* ..is a file path */
1992    NAME_ADDRSPEC_ISPIPE    = 1<< 6, /* ..is a command for piping */
1993    NAME_ADDRSPEC_ISFILEORPIPE = NAME_ADDRSPEC_ISFILE | NAME_ADDRSPEC_ISPIPE,
1994    NAME_ADDRSPEC_ISNAME    = 1<< 7, /* ..is a valid mail network address */
1995    NAME_ADDRSPEC_ISADDR    = 1<< 8, /* ..is a valid mail network address */
1996
1997    NAME_ADDRSPEC_ERR_EMPTY = 1<< 9, /* An empty string (or NULL) */
1998    NAME_ADDRSPEC_ERR_ATSEQ = 1<<10, /* Weird @ sequence */
1999    NAME_ADDRSPEC_ERR_CHAR  = 1<<11, /* Invalid character */
2000    NAME_ADDRSPEC_ERR_IDNA  = 1<<12, /* IDNA convertion failed */
2001    NAME_ADDRSPEC_INVALID   = NAME_ADDRSPEC_ERR_EMPTY |
2002          NAME_ADDRSPEC_ERR_ATSEQ | NAME_ADDRSPEC_ERR_CHAR |
2003          NAME_ADDRSPEC_ERR_IDNA,
2004
2005    /* Error storage (we must fit in 31-bit) */
2006    _NAME_SHIFTWC  = 13,
2007    _NAME_MAXWC    = 0x3FFFF,
2008    _NAME_MASKWC   = _NAME_MAXWC << _NAME_SHIFTWC
2009 };
2010
2011 /* In the !_ERR_EMPTY case, the failing character can be queried */
2012 #define NAME_ADDRSPEC_ERR_GETWC(F)  \
2013    ((((unsigned int)(F) & _NAME_MASKWC) >> _NAME_SHIFTWC) & _NAME_MAXWC)
2014 #define NAME_ADDRSPEC_ERR_SET(F, E, WC) \
2015 do {\
2016    (F) = ((F) & ~(NAME_ADDRSPEC_INVALID | _NAME_MASKWC)) |\
2017          (E) | (((unsigned int)(WC) & _NAME_MAXWC) << _NAME_SHIFTWC);\
2018 } while (0)
2019
2020 struct name {
2021    struct name *n_flink;      /* Forward link in list. */
2022    struct name *n_blink;      /* Backward list link */
2023    enum gfield n_type;        /* From which list it came */
2024    enum nameflags n_flags;    /* enum nameflags */
2025    char        *n_name;       /* This fella's address */
2026    char        *n_fullname;   /* Ditto, unless GFULL including comment */
2027    char        *n_fullextra;  /* GFULL, without address */
2028 };
2029
2030 struct addrguts {
2031    char const  *ag_input;     /* Input string as given */
2032    size_t      ag_ilen;       /* strlen() of input */
2033    size_t      ag_iaddr_start; /* Start of *addr-spec* in .ag_input */
2034    size_t      ag_iaddr_aend; /* ..and one past its end */
2035    char        *ag_skinned;   /* Output (alloced if !=.ag_input) */
2036    size_t      ag_slen;       /* strlen() of .ag_skinned */
2037    size_t      ag_sdom_start; /* Start of domain in .ag_skinned, */
2038    enum nameflags ag_n_flags; /* enum nameflags of .ag_skinned */
2039 };
2040
2041 /* MIME attachments */
2042 enum attach_conv {
2043    AC_DEFAULT,       /* _get_lc() -> _iter_*() */
2044    AC_FIX_OUTCS,     /* _get_lc() -> "charset=" .a_charset */
2045    AC_FIX_INCS,      /* "charset=".a_input_charset (nocnv) */
2046    AC_TMPFILE        /* attachment.a_tmpf is converted */
2047 };
2048
2049 struct attachment {
2050    struct attachment *a_flink;   /* Forward link in list. */
2051    struct attachment *a_blink;   /* Backward list link */
2052    char const  *a_name;       /* file name */
2053    char const  *a_content_type;  /* content type */
2054    char const  *a_content_disposition; /* content disposition */
2055    char const  *a_content_id; /* content id */
2056    char const  *a_content_description; /* content description */
2057    char const  *a_input_charset; /* Interpretation depends on .a_conv */
2058    char const  *a_charset;    /* ... */
2059    FILE        *a_tmpf;       /* If AC_TMPFILE */
2060    enum attach_conv a_conv;   /* User chosen conversion */
2061    int         a_msgno;       /* message number */
2062 };
2063
2064 struct sendbundle {
2065    struct header  *sb_hp;
2066    struct name    *sb_to;
2067    FILE           *sb_input;
2068    struct str     sb_signer;  /* USER@HOST for signing+ */
2069    struct url     sb_url;
2070    struct ccred   sb_ccred;
2071 };
2072
2073 /* Structure of the hash table of ignored header fields */
2074 struct ignoretab {
2075    int         i_count;       /* Number of entries */
2076    struct ignored {
2077       struct ignored *i_link;    /* Next ignored field in bucket */
2078       char           *i_field;   /* This ignored field */
2079    }           *i_head[HSHSIZE];
2080 };
2081
2082 /* For saving the current directory and later returning */
2083 struct cw {
2084 #ifdef HAVE_FCHDIR
2085    int         cw_fd;
2086 #else
2087    char        cw_wd[PATH_MAX];
2088 #endif
2089 };
2090
2091 /*
2092  * Global variable declarations
2093  *
2094  * These become instantiated in main.c.
2095  */
2096
2097 #undef VL
2098 #ifdef n_MAIN_SOURCE
2099 # ifndef HAVE_AMALGAMATION
2100 #  define VL
2101 # else
2102 #  define VL            static
2103 # endif
2104 #else
2105 # define VL             extern
2106 #endif
2107
2108 VL int         mb_cur_max;          /* Value of MB_CUR_MAX */
2109 VL int         realscreenheight;    /* The real screen height */
2110 VL int         scrnwidth;           /* Screen width, or best guess */
2111 VL int         scrnheight;          /* Screen height/guess (4 header) */
2112
2113 VL char const  *homedir;            /* Path name of home directory */
2114 VL char const  *myname;             /* My login name */
2115 VL char const  *progname;           /* Our name */
2116 VL char const  *tempdir;            /* The temporary directory */
2117
2118 VL gid_t       group_id;            /* getgid() and getuid() */
2119 VL uid_t       user_id;
2120
2121 VL int         exit_status;         /* Exit status */
2122 VL ui32_t      options;             /* Bits of enum user_options */
2123 VL struct name *option_r_arg;       /* Argument to -r option */
2124 VL char const  **smopts;            /* sendmail(1) opts from commline */
2125 VL size_t      smopts_count;        /* Entries in smopts */
2126
2127 VL ui32_t      pstate;              /* Bits of enum program_state */
2128 VL size_t      noreset;             /* String resets suspended (recursive) */
2129
2130 /* XXX stylish sorting */
2131 VL int            msgCount;            /* Count of messages read in */
2132 VL struct mailbox mb;                  /* Current mailbox */
2133 VL int            image;               /* File descriptor for msg image */
2134 VL char           mailname[PATH_MAX];  /* Name of current file TODO URL/object*/
2135 VL char           displayname[80 - 40]; /* Prettyfied for display TODO URL/obj*/
2136 VL char           prevfile[PATH_MAX];  /* Name of previous file TODO URL/obj */
2137 VL char const     *account_name;       /* Current account name or NULL */
2138 VL off_t          mailsize;            /* Size of system mailbox */
2139 VL struct message *dot;                /* Pointer to current message */
2140 VL struct message *prevdot;            /* Previous current message */
2141 VL struct message *message;            /* The actual message structure */
2142 VL struct message *threadroot;         /* first threaded message */
2143 VL int            *n_msgvec;           /* Folder setmsize(), list.c res. store*/
2144
2145 VL struct ignoretab  ignore[2];        /* ignored and retained fields
2146                                         * 0 is ignore, 1 is retain */
2147 VL struct ignoretab  saveignore[2];    /* ignored and retained fields
2148                                         * on save to folder */
2149 VL struct ignoretab  allignore[2];     /* special, ignore all headers */
2150 VL struct ignoretab  fwdignore[2];     /* fields to ignore for forwarding */
2151
2152 VL struct time_current  time_current;  /* time(3); send: mail1() XXXcarrier */
2153 VL struct termios_state termios_state; /* getpassword(); see commands().. */
2154
2155 #ifdef HAVE_SSL
2156 VL enum ssl_verify_level   ssl_verify_level; /* SSL verification level */
2157 #endif
2158
2159 #ifdef HAVE_ICONV
2160 VL iconv_t     iconvd;
2161 #endif
2162
2163 VL sigjmp_buf  srbuf;
2164 VL int         interrupts;
2165 VL sighandler_type dflpipe;
2166 VL sighandler_type handlerstacktop;
2167 #define handlerpush(f)  (savedtop = handlerstacktop, handlerstacktop = (f))
2168 #define handlerpop()    (handlerstacktop = savedtop)
2169
2170 /* TODO Temporary hacks unless the codebase doesn't jump and uses pass-by-value
2171  * TODO carrier structs instead of locals */
2172 VL char        *temporary_arg_v_store;
2173 VL void        *temporary_localopts_store;
2174 /* TODO temporary storage to overcome which_protocol() mess (for PROTO_FILE) */
2175 VL char const  *temporary_protocol_ext;
2176
2177 /* The remaining variables need initialization */
2178
2179 #ifndef HAVE_AMALGAMATION
2180 VL char const  month_names[12 + 1][4];
2181 VL char const  weekday_names[7 + 1][4];
2182
2183 VL char const  uagent[sizeof UAGENT];
2184
2185 VL uc_i const  class_char[1 + 0x7F];
2186 #endif
2187
2188 /*
2189  * Finally, let's include the function prototypes XXX embed
2190  */
2191
2192 #ifndef n_PRIVSEP_SOURCE
2193 # include "nailfuns.h"
2194 #endif
2195
2196 /* s-it-mode */