def.h

   1 /*
   2  * S-nail - a mail user agent derived from Berkeley Mail.
   3  *
   4  * Copyright (c) 2000-2004 Gunnar Ritter, Freiburg i. Br., Germany.
   5  * Copyright (c) 2012 Steffen "Daode" Nurpmeso.
   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. All advertising materials mentioning features or use of this software
  20  *    must display the following acknowledgement:
  21  *      This product includes software developed by the University of
  22  *      California, Berkeley and its contributors.
  23  * 4. Neither the name of the University nor the names of its contributors
  24  *    may be used to endorse or promote products derived from this software
  25  *    without specific prior written permission.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  37  * SUCH DAMAGE.
  38  */
  39
  40 /*
  41  * Mail -- a mail program
  42  *
  43  * Author: Kurt Shoens (UCB) March 25, 1978
  44  */
  45
  46 #if !defined (NI_MAXHOST) || (NI_MAXHOST) < 1025
  47 #undef  NI_MAXHOST
  48 #define NI_MAXHOST      1025
  49 #endif
  50
  51 #define APPEND                          /* New mail goes to end of mailbox */
  52
  53 /* Is *C* a quoting character (for *quote-fold* compression) */
  54 #define ISQUOTE(C)      ((C) == '>' || (C) == '|')
  55
  56 #define ESCAPE          '~'             /* Default escape for sending */
  57 #ifndef MAXPATHLEN
  58 #ifdef  PATH_MAX
  59 #define MAXPATHLEN      PATH_MAX
  60 #else
  61 #define MAXPATHLEN      1024
  62 #endif
  63 #endif
  64 #ifndef PATHSIZE
  65 #define PATHSIZE        MAXPATHLEN      /* Size of pathnames throughout */
  66 #endif
  67 #define HSHSIZE         59              /* Hash size for aliases and vars */
  68 #define LINESIZE        2560            /* max readable line width */
  69 #define STRINGSIZE      ((unsigned) 128)/* Dynamic allocation units */
  70 #define MAXARGC         1024            /* Maximum list of raw strings */
  71 #define MAXEXP          25              /* Maximum expansion of aliases */
  72
  73 #define equal(a, b)     (strcmp(a,b)==0)/* A nice function to string compare */
  74
  75 #undef tr
  76 #ifdef HAVE_CATGETS
  77 # define CATSET                 1
  78 # define tr(c, d)               catgets(catd, CATSET, c, d)
  79 #else
  80 # define catgets(a, b, c, d)    (d)
  81 # define tr(c, d)               (d)
  82 #endif
  83
  84 typedef void (*sighandler_type)(int);
  85
  86 enum okay {
  87         STOP = 0,
  88         OKAY = 1
  89 };
  90
  91 enum mimeenc {
  92         MIME_NONE,                      /* message is not in MIME format */
  93         MIME_BIN,                       /* message is in binary encoding */
  94         MIME_8B,                        /* message is in 8bit encoding */
  95         MIME_7B,                        /* message is in 7bit encoding */
  96         MIME_QP,                        /* message is quoted-printable */
  97         MIME_B64                        /* message is in base64 encoding */
  98 };
  99
 100 enum conversion {
 101         CONV_NONE,                      /* no conversion */
 102         CONV_7BIT,                      /* no conversion, is 7bit */
 103         CONV_FROMQP,                    /* convert from quoted-printable */
 104         CONV_TOQP,                      /* convert to quoted-printable */
 105         CONV_8BIT,                      /* convert to 8bit (iconv) */
 106         CONV_FROMB64,                   /* convert from base64 */
 107         CONV_FROMB64_T,                 /* convert from base64/text */
 108         CONV_TOB64,                     /* convert to base64 */
 109         CONV_FROMHDR,                   /* convert from RFC1522 format */
 110         CONV_TOHDR,                     /* convert to RFC1522 format */
 111         CONV_TOHDR_A                    /* convert addresses for header */
 112 };
 113
 114 enum sendaction {
 115         SEND_MBOX,                      /* no conversion to perform */
 116         SEND_RFC822,                    /* no conversion, no From_ line */
 117         SEND_TODISP,                    /* convert to displayable form */
 118         SEND_TODISP_ALL,                /* same, include all MIME parts */
 119         SEND_SHOW,                      /* convert to 'show' command form */
 120         SEND_TOSRCH,                    /* convert for IMAP SEARCH */
 121         SEND_TOFLTR,                    /* convert for junk mail filtering */
 122         SEND_TOFILE,                    /* convert for saving body to a file */
 123         SEND_TOPIPE,                    /* convert for pipe-content/subc. */
 124         SEND_QUOTE,                     /* convert for quoting */
 125         SEND_QUOTE_ALL,                 /* same, include all MIME parts */
 126         SEND_DECRYPT                    /* decrypt */
 127 };
 128
 129 enum mimecontent {
 130         MIME_UNKNOWN,                   /* unknown content */
 131         MIME_SUBHDR,                    /* inside a multipart subheader */
 132         MIME_822,                       /* message/rfc822 content */
 133         MIME_MESSAGE,                   /* other message/ content */
 134         MIME_TEXT_PLAIN,                /* text/plain content */
 135         MIME_TEXT_HTML,                 /* text/html content */
 136         MIME_TEXT,                      /* other text/ content */
 137         MIME_ALTERNATIVE,               /* multipart/alternative content */
 138         MIME_DIGEST,                    /* multipart/digest content */
 139         MIME_MULTI,                     /* other multipart/ content */
 140         MIME_PKCS7,                     /* PKCS7 content */
 141         MIME_DISCARD                    /* content is discarded */
 142 };
 143
 144 enum mimeclean {
 145         MIME_CLEAN      = 000,          /* plain RFC 2822 message */
 146         MIME_HIGHBIT    = 001,          /* characters >= 0200 */
 147         MIME_LONGLINES  = 002,          /* has lines too long for RFC 2822 */
 148         MIME_CTRLCHAR   = 004,          /* contains control characters */
 149         MIME_HASNUL     = 010,          /* contains \0 characters */
 150         MIME_NOTERMNL   = 020           /* lacks a terminating newline */
 151 };
 152
 153 enum tdflags {
 154         TD_NONE         = 0,    /* no display conversion */
 155         TD_ISPR         = 01,   /* use isprint() checks */
 156         TD_ICONV        = 02,   /* use iconv() */
 157         TD_DELCTRL      = 04    /* delete control characters */
 158 };
 159
 160 struct str {
 161         char *s;                        /* the string's content */
 162         size_t l;                       /* the stings's length */
 163 };
 164
 165 enum protocol {
 166         PROTO_FILE,                     /* refers to a local file */
 167         PROTO_POP3,                     /* is a pop3 server string */
 168         PROTO_IMAP,                     /* is an imap server string */
 169         PROTO_MAILDIR,                  /* refers to a maildir folder */
 170         PROTO_UNKNOWN                   /* unknown protocol */
 171 };
 172
 173 struct sock {                           /* data associated with a socket */
 174         int     s_fd;                   /* file descriptor */
 175 #ifdef  USE_SSL
 176         int     s_use_ssl;              /* SSL is used */
 177 #if defined (USE_NSS)
 178         void    *s_prfd;                /* NSPR file descriptor */
 179 #elif defined (USE_OPENSSL)
 180         void    *s_ssl;                 /* SSL object */
 181         void    *s_ctx;                 /* SSL context object */
 182 #endif  /* SSL library specific */
 183 #endif  /* USE_SSL */
 184         char    *s_wbuf;                /* for buffered writes */
 185         int     s_wbufsize;             /* allocated size of s_buf */
 186         int     s_wbufpos;              /* position of first empty data byte */
 187         char    s_rbuf[LINESIZE+1];     /* for buffered reads */
 188         char    *s_rbufptr;             /* read pointer to s_rbuf */
 189         int     s_rsz;                  /* size of last read in s_rbuf */
 190         char    *s_desc;                /* description of error messages */
 191         void    (*s_onclose)(void);     /* execute on close */
 192 };
 193
 194 struct mailbox {
 195         struct sock     mb_sock;        /* socket structure */
 196         enum {
 197                 MB_NONE         = 000,  /* no reply expected */
 198                 MB_COMD         = 001,  /* command reply expected */
 199                 MB_MULT         = 002,  /* multiline reply expected */
 200                 MB_PREAUTH      = 004,  /* not in authenticated state */
 201                 MB_BYE          = 010   /* may accept a BYE state */
 202         } mb_active;
 203         FILE *mb_itf;                   /* temp file with messages, read open */
 204         FILE *mb_otf;                   /* same, write open */
 205         char *mb_sorted;                /* sort method */
 206         enum {
 207                 MB_VOID,                /* no type (e. g. connection failed) */
 208                 MB_FILE,                /* local file */
 209                 MB_POP3,                /* POP3 mailbox */
 210                 MB_IMAP,                /* IMAP mailbox */
 211                 MB_MAILDIR,             /* maildir folder */
 212                 MB_CACHE                /* cached mailbox */
 213         } mb_type;                      /* type of mailbox */
 214         enum {
 215                 MB_DELE = 01,           /* may delete messages in mailbox */
 216                 MB_EDIT = 02            /* may edit messages in mailbox */
 217         } mb_perm;
 218         int mb_compressed;              /* is a compressed mbox file */
 219         int mb_threaded;                /* mailbox has been threaded */
 220         enum mbflags {
 221                 MB_NOFLAGS      = 000,
 222                 MB_UIDPLUS      = 001   /* supports IMAP UIDPLUS */
 223         } mb_flags;
 224         unsigned long   mb_uidvalidity; /* IMAP unique identifier validity */
 225         char    *mb_imap_account;       /* name of current IMAP account */
 226         char    *mb_imap_mailbox;       /* name of current IMAP mailbox */
 227         char    *mb_cache_directory;    /* name of cache directory */
 228 };
 229
 230 enum needspec {
 231         NEED_UNSPEC,                    /* unspecified need, don't fetch */
 232         NEED_HEADER,                    /* need the header of a message */
 233         NEED_BODY                       /* need header and body of a message */
 234 };
 235
 236 enum havespec {
 237         HAVE_NOTHING = 0,               /* nothing downloaded yet */
 238         HAVE_HEADER = 01,               /* header is downloaded */
 239         HAVE_BODY = 02                  /* entire message is downloaded */
 240 };
 241
 242 /*
 243  * flag bits. Attention: Flags that are used in cache.c may not change.
 244  */
 245 enum mflag {
 246         MUSED           = (1<<0),       /* entry is used, but this bit isn't */
 247         MDELETED        = (1<<1),       /* entry has been deleted */
 248         MSAVED          = (1<<2),       /* entry has been saved */
 249         MTOUCH          = (1<<3),       /* entry has been noticed */
 250         MPRESERVE       = (1<<4),       /* keep entry in sys mailbox */
 251         MMARK           = (1<<5),       /* message is marked! */
 252         MODIFY          = (1<<6),       /* message has been modified */
 253         MNEW            = (1<<7),       /* message has never been seen */
 254         MREAD           = (1<<8),       /* message has been read sometime. */
 255         MSTATUS         = (1<<9),       /* message status has changed */
 256         MBOX            = (1<<10),      /* Send this to mbox, regardless */
 257         MNOFROM         = (1<<11),      /* no From line */
 258         MHIDDEN         = (1<<12),      /* message is hidden to user */
 259         MFULLYCACHED    = (1<<13),      /* message is completely cached */
 260         MBOXED          = (1<<14),      /* message has been sent to mbox */
 261         MUNLINKED       = (1<<15),      /* message was unlinked from cache */
 262         MNEWEST         = (1<<16),      /* message is very new (newmail) */
 263         MFLAG           = (1<<17),      /* message has been flagged recently */
 264         MUNFLAG         = (1<<18),      /* message has been unflagged */
 265         MFLAGGED        = (1<<19),      /* message is `flagged' */
 266         MANSWER         = (1<<20),      /* message has been answered recently */
 267         MUNANSWER       = (1<<21),      /* message has been unanswered */
 268         MANSWERED       = (1<<22),      /* message is `answered' */
 269         MDRAFT          = (1<<23),      /* message has been drafted recently */
 270         MUNDRAFT        = (1<<24),      /* message has been undrafted */
 271         MDRAFTED        = (1<<25),      /* message is marked as `draft' */
 272         MKILL           = (1<<26),      /* message has been killed */
 273         MOLDMARK        = (1<<27),      /* messages was marked previously */
 274         MJUNK           = (1<<28)       /* message is classified as junk */
 275 };
 276
 277 struct mimepart {
 278         enum mflag      m_flag;         /* flags */
 279         enum havespec   m_have;         /* downloaded parts of the part */
 280         int     m_block;                /* block number of this part */
 281         size_t  m_offset;               /* offset in block of part */
 282         size_t  m_size;                 /* Bytes in the part */
 283         size_t  m_xsize;                /* Bytes in the full part */
 284         long    m_lines;                /* Lines in the message */
 285         long    m_xlines;               /* Lines in the full message */
 286         time_t  m_time;                 /* time the message was sent */
 287         char    *m_from;                /* message sender */
 288         struct mimepart *m_nextpart;    /* next part at same level */
 289         struct mimepart *m_multipart;   /* parts of multipart */
 290         struct mimepart *m_parent;      /* enclosing multipart part */
 291         char    *m_ct_type;             /* content-type */
 292         char    *m_ct_type_plain;       /* content-type without specs */
 293         enum mimecontent        m_mimecontent;  /* same in enum */
 294         char    *m_charset;             /* charset */
 295         char    *m_ct_transfer_enc;     /* content-transfer-encoding */
 296         enum mimeenc    m_mimeenc;      /* same in enum */
 297         char    *m_partstring;          /* part level string */
 298         char    *m_filename;            /* attachment filename */
 299 };
 300
 301 struct message {
 302         enum mflag      m_flag;         /* flags */
 303         enum havespec   m_have;         /* downloaded parts of the message */
 304         int     m_block;                /* block number of this message */
 305         size_t  m_offset;               /* offset in block of message */
 306         size_t  m_size;                 /* Bytes in the message */
 307         size_t  m_xsize;                /* Bytes in the full message */
 308         long    m_lines;                /* Lines in the message */
 309         long    m_xlines;               /* Lines in the full message */
 310         time_t  m_time;                 /* time the message was sent */
 311         time_t  m_date;                 /* time in the 'Date' field */
 312         unsigned        m_idhash;       /* hash on Message-ID for threads */
 313         unsigned long   m_uid;          /* IMAP unique identifier */
 314         struct message  *m_child;       /* first child of this message */
 315         struct message  *m_younger;     /* younger brother of this message */
 316         struct message  *m_elder;       /* elder brother of this message */
 317         struct message  *m_parent;      /* parent of this message */
 318         unsigned        m_level;        /* thread level of message */
 319         long            m_threadpos;    /* position in threaded display */
 320         float           m_score;        /* score of message */
 321         char    *m_maildir_file;        /* original maildir file of msg */
 322         unsigned        m_maildir_hash; /* hash of file name in maildir sub */
 323         int     m_collapsed;            /* collapsed thread information */
 324 };
 325
 326 /*
 327  * Given a file address, determine the block number it represents.
 328  */
 329 #define mailx_blockof(off)              ((int) ((off) / 4096))
 330 #define mailx_offsetof(off)             ((int) ((off) % 4096))
 331 #define mailx_positionof(block, offset) ((off_t)(block) * 4096 + (offset))
 332
 333 /*
 334  * Argument types.
 335  */
 336 enum argtype {
 337         MSGLIST = 0,            /* Message list type */
 338         STRLIST = 1,            /* A pure string */
 339         RAWLIST = 2,            /* Shell string list */
 340         NOLIST  = 3,            /* Just plain 0 */
 341         NDMLIST = 4,            /* Message list, no defaults */
 342         ECHOLIST= 5,            /* Like raw list, but keep quote chars */
 343         P       = 040,          /* Autoprint dot after command */
 344         I       = 0100,         /* Interactive command bit */
 345         M       = 0200,         /* Legal from send mode bit */
 346         W       = 0400,         /* Illegal when read only bit */
 347         F       = 01000,        /* Is a conditional command */
 348         T       = 02000,        /* Is a transparent command */
 349         R       = 04000,        /* Cannot be called from collect */
 350         A       = 010000        /* Needs an active mailbox */
 351 };
 352
 353 /*
 354  * Oft-used mask values
 355  */
 356
 357 #define MMNORM          (MDELETED|MSAVED|MHIDDEN)/* Look at both save and delete bits */
 358 #define MMNDEL          (MDELETED|MHIDDEN)      /* Look only at deleted bit */
 359
 360 /*
 361  * Format of the command description table.
 362  * The actual table is declared and initialized
 363  * in lex.c
 364  */
 365 struct cmd {
 366         char    *c_name;                /* Name of command */
 367         int     (*c_func)(void *);      /* Implementor of the command */
 368         enum argtype    c_argtype;      /* Type of arglist (see below) */
 369         short   c_msgflag;              /* Required flags of messages */
 370         short   c_msgmask;              /* Relevant flags of messages */
 371 };
 372
 373 /* Yechh, can't initialize unions */
 374
 375 #define c_minargs c_msgflag             /* Minimum argcount for RAWLIST */
 376 #define c_maxargs c_msgmask             /* Max argcount for RAWLIST */
 377
 378 /*
 379  * Structure used to return a break down of a head
 380  * line (hats off to Bill Joy!)
 381  */
 382
 383 struct headline {
 384         char    *l_from;        /* The name of the sender */
 385         char    *l_tty;         /* His tty string (if any) */
 386         char    *l_date;        /* The entire date string */
 387 };
 388
 389 enum gfield {
 390         GTO     = 1,            /* Grab To: line */
 391         GSUBJECT= 2,            /* Likewise, Subject: line */
 392         GCC     = 4,            /* And the Cc: line */
 393         GBCC    = 8,            /* And also the Bcc: line */
 394
 395         GNL     = 16,           /* Print blank line after */
 396         GDEL    = 32,           /* Entity removed from list */
 397         GCOMMA  = 64,           /* detract puts in commas */
 398         GUA     = 128,          /* User-Agent field */
 399         GMIME   = 256,          /* MIME 1.0 fields */
 400         GMSGID  = 512,          /* a Message-ID */
 401         /*        1024 */       /* unused */
 402         GIDENT  = 2048,         /* From:, Reply-To: and Organization: field */
 403         GREF    = 4096,         /* References: field */
 404         GDATE   = 8192,         /* Date: field */
 405         GFULL   = 16384,        /* include full names */
 406         GSKIN   = 32768,        /* skin names */
 407         GEXTRA  = 65536,        /* extra fields */
 408         GFILES  = 131072        /* include filename addresses */
 409 };
 410
 411 #define GMASK   (GTO|GSUBJECT|GCC|GBCC) /* Mask of places from whence */
 412
 413 #define visible(mp)     (((mp)->m_flag & (MDELETED|MHIDDEN|MKILL)) == 0 || \
 414                                 (dot == (mp) && (mp)->m_flag & MKILL))
 415
 416 /*
 417  * Structure used to pass about the current
 418  * state of the user-typed message header.
 419  */
 420
 421 struct header {
 422         struct name *h_to;              /* Dynamic "To:" string */
 423         char *h_subject;                /* Subject string */
 424         struct name *h_cc;              /* Carbon copies string */
 425         struct name *h_bcc;             /* Blind carbon copies */
 426         struct name *h_ref;             /* References */
 427         struct name *h_smopts;          /* Sendmail options */
 428         struct attachment *h_attach;    /* MIME attachments */
 429         char    *h_charset;             /* preferred charset */
 430         struct name *h_from;            /* overridden "From:" field */
 431         struct name *h_replyto;         /* overridden "Reply-To:" field */
 432         struct name *h_sender;          /* overridden "Sender:" field */
 433         char *h_organization;           /* overridden "Organization:" field */
 434 };
 435
 436 /*
 437  * Structure of namelist nodes used in processing
 438  * the recipients of mail and aliases and all that
 439  * kind of stuff.
 440  */
 441
 442 enum nameflags {
 443         NAME_MIME_CHECKED       = 1<<0, /* mime_name_invalid() yet checked.. */
 444         NAME_MIME_INVALID       = 1<<1, /* ..and it was invalid */
 445         NAME_IDNA_REQUIRED      = 1<<2, /* IDNA convertion desired.. */
 446         NAME_IDNA_APPLIED       = 1<<3  /* ..and is applied to name.n_name */
 447 };
 448
 449 struct name {
 450         struct  name *n_flink;          /* Forward link in list. */
 451         struct  name *n_blink;          /* Backward list link */
 452         enum gfield     n_type;         /* From which list it came */
 453         int     n_flags;                /* enum nameflags */
 454         char    *n_name;                /* This fella's name */
 455         char    *n_fullname;            /* Sometimes, name including comment */
 456 };
 457
 458 /*
 459  * Structure of a MIME attachment.
 460  */
 461
 462 struct attachment {
 463         struct attachment *a_flink;     /* Forward link in list. */
 464         struct attachment *a_blink;     /* Backward list link */
 465         char    *a_name;                /* file name */
 466         char    *a_content_type;        /* content type */
 467         char    *a_content_disposition; /* content disposition */
 468         char    *a_content_id;          /* content id */
 469         char    *a_content_description; /* content description */
 470         char    *a_charset;             /* character set */
 471         int     a_msgno;                /* message number */
 472 };
 473
 474 /*
 475  * Structure of a variable node.  All variables are
 476  * kept on a singly-linked list of these, rooted by
 477  * "variables"
 478  */
 479
 480 struct var {
 481         struct  var *v_link;            /* Forward link to next variable */
 482         char    *v_name;                /* The variable's name */
 483         char    *v_value;               /* And it's current value */
 484 };
 485
 486 struct group {
 487         struct  group *ge_link;         /* Next person in this group */
 488         char    *ge_name;               /* This person's user name */
 489 };
 490
 491 struct grouphead {
 492         struct  grouphead *g_link;      /* Next grouphead in list */
 493         char    *g_name;                /* Name of this group */
 494         struct  group *g_list;          /* Users in group. */
 495 };
 496
 497 /*
 498  * Structure of the hash table of ignored header fields
 499  */
 500 struct ignoretab {
 501         int i_count;                    /* Number of entries */
 502         struct ignore {
 503                 struct ignore *i_link;  /* Next ignored field in bucket */
 504                 char *i_field;          /* This ignored field */
 505         } *i_head[HSHSIZE];
 506 };
 507
 508 /*
 509  * Token values returned by the scanner used for argument lists.
 510  * Also, sizes of scanner-related things.
 511  */
 512 enum ltoken {
 513         TEOL    = 0,                    /* End of the command line */
 514         TNUMBER = 1,                    /* A message number */
 515         TDASH   = 2,                    /* A simple dash */
 516         TSTRING = 3,                    /* A string (possibly containing -) */
 517         TDOT    = 4,                    /* A "." */
 518         TUP     = 5,                    /* An "^" */
 519         TDOLLAR = 6,                    /* A "$" */
 520         TSTAR   = 7,                    /* A "*" */
 521         TOPEN   = 8,                    /* An '(' */
 522         TCLOSE  = 9,                    /* A ')' */
 523         TPLUS   = 10,                   /* A '+' */
 524         TERROR  = 11,                   /* A lexical error */
 525         TCOMMA  = 12,                   /* A ',' */
 526         TSEMI   = 13,                   /* A ';' */
 527         TBACK   = 14                    /* A '`' */
 528 };
 529
 530 #define REGDEP  2                       /* Maximum regret depth. */
 531
 532 /*
 533  * Constants for conditional commands.  These describe whether
 534  * we should be executing stuff or not.
 535  */
 536 enum condition {
 537         CANY    = 0,    /* Execute in send or receive mode */
 538         CRCV    = 1,    /* Execute in receive mode only */
 539         CSEND   = 2,    /* Execute in send mode only */
 540         CTERM   = 3,    /* Execute only if stdin is a tty */
 541         CNONTERM= 4     /* Execute only if stdin not tty */
 542 };
 543
 544 /*
 545  * For the 'shortcut' and 'unshortcut' functionality.
 546  */
 547 struct shortcut {
 548         struct shortcut *sh_next;       /* next shortcut in list */
 549         char    *sh_short;              /* shortcut string */
 550         char    *sh_long;               /* expanded form */
 551 };
 552
 553 /*
 554  * Kludges to handle the change from setexit / reset to setjmp / longjmp
 555  */
 556
 557 #define setexit()       sigsetjmp(srbuf, 1)
 558 #define reset(x)        siglongjmp(srbuf, x)
 559
 560 /*
 561  * Locale-independent character classes.
 562  */
 563 enum {
 564         C_CNTRL = 0000,
 565         C_BLANK = 0001,
 566         C_WHITE = 0002,
 567         C_SPACE = 0004,
 568         C_PUNCT = 0010,
 569         C_OCTAL = 0020,
 570         C_DIGIT = 0040,
 571         C_UPPER = 0100,
 572         C_LOWER = 0200
 573 };
 574
 575 extern const unsigned char      class_char[];
 576
 577 #define __ischarof(C, FLAGS) (asciichar(C) && class_char[(size_t)C] & (FLAGS))
 578 #define __ischareq(C, FLAGS) (asciichar(C) && class_char[(size_t)C] == (FLAGS))
 579
 580 #define asciichar(c) ((size_t)(c) <= 0177)
 581 #define alnumchar(c) __ischarof(c, C_DIGIT|C_OCTAL|C_UPPER|C_LOWER)
 582 #define alphachar(c) __ischarof(c, C_UPPER|C_LOWER)
 583 #define blankchar(c) __ischarof(c, C_BLANK)
 584 #define blankspacechar(c) __ischarof(c, C_BLANK|C_SPACE)
 585 #define cntrlchar(c) __ischareq(c, C_CNTRL)
 586 #define digitchar(c) __ischarof(c, C_DIGIT|C_OCTAL)
 587 #define lowerchar(c) __ischarof(c, C_LOWER)
 588 #define punctchar(c) __ischarof(c, C_PUNCT)
 589 #define spacechar(c) __ischarof(c, C_BLANK|C_SPACE|C_WHITE)
 590 #define upperchar(c) __ischarof(c, C_UPPER)
 591 #define whitechar(c) __ischarof(c, C_BLANK|C_WHITE)
 592 #define octalchar(c) __ischarof(c, C_OCTAL)
 593
 594 #define upperconv(c) (lowerchar(c) ? (c)-'a'+'A' : (c))
 595 #define lowerconv(c) (upperchar(c) ? (c)-'A'+'a' : (c))
 596 /*      RFC 822, 3.2.   */
 597 #define fieldnamechar(c) (asciichar(c)&&(c)>040&&(c)!=0177&&(c)!=':')
 598
 599 /*
 600  * Truncate a file to the last character written. This is
 601  * useful just before closing an old file that was opened
 602  * for read/write.
 603  */
 604 #define trunc(stream) {                                                 \
 605         fflush(stream);                                                 \
 606         ftruncate(fileno(stream), (off_t)ftell(stream));                \
 607 }
 608
 609 /*
 610  * Use either alloca() or smalloc()/free(). ac_alloc can be used to
 611  * allocate space within a function. ac_free must be called when the
 612  * space is no longer needed, but expands to nothing if using alloca().
 613  */
 614 #ifdef  HAVE_ALLOCA
 615 #define ac_alloc(n)     alloca(n)
 616 #define ac_free(n)      do {} while (0)
 617 #else   /* !HAVE_ALLOCA */
 618 #define ac_alloc(n)     smalloc(n)
 619 #define ac_free(n)      free(n)
 620 #endif  /* !HAVE_ALLOCA */
 621
 622 /*
 623  * Single-threaded, use unlocked I/O.
 624  */
 625 #ifdef HAVE_PUTC_UNLOCKED
 626 # undef getc
 627 # define getc(c)        getc_unlocked(c)
 628 # undef putc
 629 # define putc(c, f)     putc_unlocked(c, f)
 630 # undef putchar
 631 # define putchar(c)     putc_unlocked((c), stdout)
 632 #endif
 633
 634 #define CBAD            (-15555)
 635
 636 #define smin(a, b)      ((a) < (b) ? (a) : (b))
 637 #define smax(a, b)      ((a) < (b) ? (b) : (a))
 638
 639 /*
 640  * For saving the current directory and later returning.
 641  */
 642 #ifdef  HAVE_FCHDIR
 643 struct  cw {
 644         int     cw_fd;
 645 };
 646 #else   /* !HAVE_FCHDIR */
 647 struct  cw {
 648         char    cw_wd[PATHSIZE];
 649 };
 650 #endif  /* !HAVE_FCHDIR */
 651
 652 #ifdef  USE_SSL
 653 enum ssl_vrfy_level {
 654         VRFY_IGNORE,
 655         VRFY_WARN,
 656         VRFY_ASK,
 657         VRFY_STRICT
 658 };
 659 #endif  /* USE_SSL */