def.h

   1 /*
   2  * Heirloom mailx - a mail user agent derived from Berkeley Mail.
   3  *
   4  * Copyright (c) 2000-2004 Gunnar Ritter, Freiburg i. Br., Germany.
   5  */
   6 /*
   7  * Copyright (c) 1980, 1993
   8  *      The Regents of the University of California.  All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  *
  38  *      Sccsid @(#)def.h        2.104 (gritter) 3/4/06
  39  */
  40
  41 /*
  42  * Mail -- a mail program
  43  *
  44  * Author: Kurt Shoens (UCB) March 25, 1978
  45  */
  46
  47 #if !defined (NI_MAXHOST) || (NI_MAXHOST) < 1025
  48 #undef  NI_MAXHOST
  49 #define NI_MAXHOST      1025
  50 #endif
  51
  52 #define APPEND                          /* New mail goes to end of mailbox */
  53
  54 #define ESCAPE          '~'             /* Default escape for sending */
  55 #ifndef MAXPATHLEN
  56 #ifdef  PATH_MAX
  57 #define MAXPATHLEN      PATH_MAX
  58 #else
  59 #define MAXPATHLEN      1024
  60 #endif
  61 #endif
  62 #ifndef PATHSIZE
  63 #define PATHSIZE        MAXPATHLEN      /* Size of pathnames throughout */
  64 #endif
  65 #define HSHSIZE         59              /* Hash size for aliases and vars */
  66 #define LINESIZE        2560            /* max readable line width */
  67 #define STRINGSIZE      ((unsigned) 128)/* Dynamic allocation units */
  68 #define MAXARGC         1024            /* Maximum list of raw strings */
  69 #define MAXEXP          25              /* Maximum expansion of aliases */
  70
  71 #define equal(a, b)     (strcmp(a,b)==0)/* A nice function to string compare */
  72
  73 #ifdef  HAVE_CATGETS
  74 #define CATSET  1
  75 #else   /* !HAVE_CATGETS */
  76 #define catgets(a, b, c, d)     (d)
  77 #endif  /* !HAVE_CATGETS */
  78
  79 typedef void (*sighandler_type)(int);
  80
  81 enum okay {
  82         STOP = 0,
  83         OKAY = 1
  84 };
  85
  86 enum mimeenc {
  87         MIME_NONE,                      /* message is not in MIME format */
  88         MIME_BIN,                       /* message is in binary encoding */
  89         MIME_8B,                        /* message is in 8bit encoding */
  90         MIME_7B,                        /* message is in 7bit encoding */
  91         MIME_QP,                        /* message is quoted-printable */
  92         MIME_B64                        /* message is in base64 encoding */
  93 };
  94
  95 enum conversion {
  96         CONV_NONE,                      /* no conversion */
  97         CONV_7BIT,                      /* no conversion, is 7bit */
  98         CONV_FROMQP,                    /* convert from quoted-printable */
  99         CONV_TOQP,                      /* convert to quoted-printable */
 100         CONV_8BIT,                      /* convert to 8bit (iconv) */
 101         CONV_FROMB64,                   /* convert from base64 */
 102         CONV_FROMB64_T,                 /* convert from base64/text */
 103         CONV_TOB64,                     /* convert to base64 */
 104         CONV_FROMHDR,                   /* convert from RFC1522 format */
 105         CONV_TOHDR,                     /* convert to RFC1522 format */
 106         CONV_TOHDR_A                    /* convert addresses for header */
 107 };
 108
 109 enum sendaction {
 110         SEND_MBOX,                      /* no conversion to perform */
 111         SEND_RFC822,                    /* no conversion, no From_ line */
 112         SEND_TODISP,                    /* convert to displayable form */
 113         SEND_TODISP_ALL,                /* same, include all MIME parts */
 114         SEND_SHOW,                      /* convert to 'show' command form */
 115         SEND_TOSRCH,                    /* convert for IMAP SEARCH */
 116         SEND_TOFLTR,                    /* convert for junk mail filtering */
 117         SEND_TOFILE,                    /* convert for saving body to a file */
 118         SEND_TOPIPE,                    /* convert for pipe-content/subc. */
 119         SEND_QUOTE,                     /* convert for quoting */
 120         SEND_QUOTE_ALL,                 /* same, include all MIME parts */
 121         SEND_DECRYPT                    /* decrypt */
 122 };
 123
 124 enum mimecontent {
 125         MIME_UNKNOWN,                   /* unknown content */
 126         MIME_SUBHDR,                    /* inside a multipart subheader */
 127         MIME_822,                       /* message/rfc822 content */
 128         MIME_MESSAGE,                   /* other message/ content */
 129         MIME_TEXT_PLAIN,                /* text/plain content */
 130         MIME_TEXT_HTML,                 /* text/html content */
 131         MIME_TEXT,                      /* other text/ content */
 132         MIME_ALTERNATIVE,               /* multipart/alternative content */
 133         MIME_DIGEST,                    /* multipart/digest content */
 134         MIME_MULTI,                     /* other multipart/ content */
 135         MIME_PKCS7,                     /* PKCS7 content */
 136         MIME_DISCARD                    /* content is discarded */
 137 };
 138
 139 enum mimeclean {
 140         MIME_CLEAN      = 000,          /* plain RFC 2822 message */
 141         MIME_HIGHBIT    = 001,          /* characters >= 0200 */
 142         MIME_LONGLINES  = 002,          /* has lines too long for RFC 2822 */
 143         MIME_CTRLCHAR   = 004,          /* contains control characters */
 144         MIME_HASNUL     = 010,          /* contains \0 characters */
 145         MIME_NOTERMNL   = 020           /* lacks a terminating newline */
 146 };
 147
 148 enum tdflags {
 149         TD_NONE         = 0,    /* no display conversion */
 150         TD_ISPR         = 01,   /* use isprint() checks */
 151         TD_ICONV        = 02,   /* use iconv() */
 152         TD_DELCTRL      = 04    /* delete control characters */
 153 };
 154
 155 struct str {
 156         char *s;                        /* the string's content */
 157         size_t l;                       /* the stings's length */
 158 };
 159
 160 enum protocol {
 161         PROTO_FILE,                     /* refers to a local file */
 162         PROTO_POP3,                     /* is a pop3 server string */
 163         PROTO_IMAP,                     /* is an imap server string */
 164         PROTO_MAILDIR,                  /* refers to a maildir folder */
 165         PROTO_UNKNOWN                   /* unknown protocol */
 166 };
 167
 168 struct sock {                           /* data associated with a socket */
 169         int     s_fd;                   /* file descriptor */
 170 #ifdef  USE_SSL
 171         int     s_use_ssl;              /* SSL is used */
 172 #if defined (USE_NSS)
 173         void    *s_prfd;                /* NSPR file descriptor */
 174 #elif defined (USE_OPENSSL)
 175         void    *s_ssl;                 /* SSL object */
 176         void    *s_ctx;                 /* SSL context object */
 177 #endif  /* SSL library specific */
 178 #endif  /* USE_SSL */
 179         char    *s_wbuf;                /* for buffered writes */
 180         int     s_wbufsize;             /* allocated size of s_buf */
 181         int     s_wbufpos;              /* position of first empty data byte */
 182         char    s_rbuf[LINESIZE+1];     /* for buffered reads */
 183         char    *s_rbufptr;             /* read pointer to s_rbuf */
 184         int     s_rsz;                  /* size of last read in s_rbuf */
 185         char    *s_desc;                /* description of error messages */
 186         void    (*s_onclose)(void);     /* execute on close */
 187 };
 188
 189 struct mailbox {
 190         struct sock     mb_sock;        /* socket structure */
 191         enum {
 192                 MB_NONE         = 000,  /* no reply expected */
 193                 MB_COMD         = 001,  /* command reply expected */
 194                 MB_MULT         = 002,  /* multiline reply expected */
 195                 MB_PREAUTH      = 004,  /* not in authenticated state */
 196                 MB_BYE          = 010   /* may accept a BYE state */
 197         } mb_active;
 198         FILE *mb_itf;                   /* temp file with messages, read open */
 199         FILE *mb_otf;                   /* same, write open */
 200         char *mb_sorted;                /* sort method */
 201         enum {
 202                 MB_VOID,                /* no type (e. g. connection failed) */
 203                 MB_FILE,                /* local file */
 204                 MB_POP3,                /* POP3 mailbox */
 205                 MB_IMAP,                /* IMAP mailbox */
 206                 MB_MAILDIR,             /* maildir folder */
 207                 MB_CACHE                /* cached mailbox */
 208         } mb_type;                      /* type of mailbox */
 209         enum {
 210                 MB_DELE = 01,           /* may delete messages in mailbox */
 211                 MB_EDIT = 02            /* may edit messages in mailbox */
 212         } mb_perm;
 213         int mb_compressed;              /* is a compressed mbox file */
 214         int mb_threaded;                /* mailbox has been threaded */
 215         enum mbflags {
 216                 MB_NOFLAGS      = 000,
 217                 MB_UIDPLUS      = 001   /* supports IMAP UIDPLUS */
 218         } mb_flags;
 219         unsigned long   mb_uidvalidity; /* IMAP unique identifier validity */
 220         char    *mb_imap_account;       /* name of current IMAP account */
 221         char    *mb_imap_mailbox;       /* name of current IMAP mailbox */
 222         char    *mb_cache_directory;    /* name of cache directory */
 223 };
 224
 225 enum needspec {
 226         NEED_UNSPEC,                    /* unspecified need, don't fetch */
 227         NEED_HEADER,                    /* need the header of a message */
 228         NEED_BODY                       /* need header and body of a message */
 229 };
 230
 231 enum havespec {
 232         HAVE_NOTHING = 0,               /* nothing downloaded yet */
 233         HAVE_HEADER = 01,               /* header is downloaded */
 234         HAVE_BODY = 02                  /* entire message is downloaded */
 235 };
 236
 237 /*
 238  * flag bits. Attention: Flags that are used in cache.c may not change.
 239  */
 240 enum mflag {
 241         MUSED           = (1<<0),       /* entry is used, but this bit isn't */
 242         MDELETED        = (1<<1),       /* entry has been deleted */
 243         MSAVED          = (1<<2),       /* entry has been saved */
 244         MTOUCH          = (1<<3),       /* entry has been noticed */
 245         MPRESERVE       = (1<<4),       /* keep entry in sys mailbox */
 246         MMARK           = (1<<5),       /* message is marked! */
 247         MODIFY          = (1<<6),       /* message has been modified */
 248         MNEW            = (1<<7),       /* message has never been seen */
 249         MREAD           = (1<<8),       /* message has been read sometime. */
 250         MSTATUS         = (1<<9),       /* message status has changed */
 251         MBOX            = (1<<10),      /* Send this to mbox, regardless */
 252         MNOFROM         = (1<<11),      /* no From line */
 253         MHIDDEN         = (1<<12),      /* message is hidden to user */
 254         MFULLYCACHED    = (1<<13),      /* message is completely cached */
 255         MBOXED          = (1<<14),      /* message has been sent to mbox */
 256         MUNLINKED       = (1<<15),      /* message was unlinked from cache */
 257         MNEWEST         = (1<<16),      /* message is very new (newmail) */
 258         MFLAG           = (1<<17),      /* message has been flagged recently */
 259         MUNFLAG         = (1<<18),      /* message has been unflagged */
 260         MFLAGGED        = (1<<19),      /* message is `flagged' */
 261         MANSWER         = (1<<20),      /* message has been answered recently */
 262         MUNANSWER       = (1<<21),      /* message has been unanswered */
 263         MANSWERED       = (1<<22),      /* message is `answered' */
 264         MDRAFT          = (1<<23),      /* message has been drafted recently */
 265         MUNDRAFT        = (1<<24),      /* message has been undrafted */
 266         MDRAFTED        = (1<<25),      /* message is marked as `draft' */
 267         MKILL           = (1<<26),      /* message has been killed */
 268         MOLDMARK        = (1<<27),      /* messages was marked previously */
 269         MJUNK           = (1<<28)       /* message is classified as junk */
 270 };
 271
 272 struct mimepart {
 273         enum mflag      m_flag;         /* flags */
 274         enum havespec   m_have;         /* downloaded parts of the part */
 275         int     m_block;                /* block number of this part */
 276         size_t  m_offset;               /* offset in block of part */
 277         size_t  m_size;                 /* Bytes in the part */
 278         size_t  m_xsize;                /* Bytes in the full part */
 279         long    m_lines;                /* Lines in the message */
 280         long    m_xlines;               /* Lines in the full message */
 281         time_t  m_time;                 /* time the message was sent */
 282         char    *m_from;                /* message sender */
 283         struct mimepart *m_nextpart;    /* next part at same level */
 284         struct mimepart *m_multipart;   /* parts of multipart */
 285         struct mimepart *m_parent;      /* enclosing multipart part */
 286         char    *m_ct_type;             /* content-type */
 287         char    *m_ct_type_plain;       /* content-type without specs */
 288         enum mimecontent        m_mimecontent;  /* same in enum */
 289         char    *m_charset;             /* charset */
 290         char    *m_ct_transfer_enc;     /* content-transfer-encoding */
 291         enum mimeenc    m_mimeenc;      /* same in enum */
 292         char    *m_partstring;          /* part level string */
 293         char    *m_filename;            /* attachment filename */
 294 };
 295
 296 struct message {
 297         enum mflag      m_flag;         /* flags */
 298         enum havespec   m_have;         /* downloaded parts of the message */
 299         int     m_block;                /* block number of this message */
 300         size_t  m_offset;               /* offset in block of message */
 301         size_t  m_size;                 /* Bytes in the message */
 302         size_t  m_xsize;                /* Bytes in the full message */
 303         long    m_lines;                /* Lines in the message */
 304         long    m_xlines;               /* Lines in the full message */
 305         time_t  m_time;                 /* time the message was sent */
 306         time_t  m_date;                 /* time in the 'Date' field */
 307         unsigned        m_idhash;       /* hash on Message-ID for threads */
 308         unsigned long   m_uid;          /* IMAP unique identifier */
 309         struct message  *m_child;       /* first child of this message */
 310         struct message  *m_younger;     /* younger brother of this message */
 311         struct message  *m_elder;       /* elder brother of this message */
 312         struct message  *m_parent;      /* parent of this message */
 313         unsigned        m_level;        /* thread level of message */
 314         long            m_threadpos;    /* position in threaded display */
 315         float           m_score;        /* score of message */
 316         char    *m_maildir_file;        /* original maildir file of msg */
 317         unsigned        m_maildir_hash; /* hash of file name in maildir sub */
 318         int     m_collapsed;            /* collapsed thread information */
 319 };
 320
 321 /*
 322  * Given a file address, determine the block number it represents.
 323  */
 324 #define mailx_blockof(off)              ((int) ((off) / 4096))
 325 #define mailx_offsetof(off)             ((int) ((off) % 4096))
 326 #define mailx_positionof(block, offset) ((off_t)(block) * 4096 + (offset))
 327
 328 /*
 329  * Argument types.
 330  */
 331 enum argtype {
 332         MSGLIST = 0,            /* Message list type */
 333         STRLIST = 1,            /* A pure string */
 334         RAWLIST = 2,            /* Shell string list */
 335         NOLIST  = 3,            /* Just plain 0 */
 336         NDMLIST = 4,            /* Message list, no defaults */
 337         ECHOLIST= 5,            /* Like raw list, but keep quote chars */
 338         P       = 040,          /* Autoprint dot after command */
 339         I       = 0100,         /* Interactive command bit */
 340         M       = 0200,         /* Legal from send mode bit */
 341         W       = 0400,         /* Illegal when read only bit */
 342         F       = 01000,        /* Is a conditional command */
 343         T       = 02000,        /* Is a transparent command */
 344         R       = 04000,        /* Cannot be called from collect */
 345         A       = 010000        /* Needs an active mailbox */
 346 };
 347
 348 /*
 349  * Oft-used mask values
 350  */
 351
 352 #define MMNORM          (MDELETED|MSAVED|MHIDDEN)/* Look at both save and delete bits */
 353 #define MMNDEL          (MDELETED|MHIDDEN)      /* Look only at deleted bit */
 354
 355 /*
 356  * Format of the command description table.
 357  * The actual table is declared and initialized
 358  * in lex.c
 359  */
 360 struct cmd {
 361         char    *c_name;                /* Name of command */
 362         int     (*c_func)(void *);      /* Implementor of the command */
 363         enum argtype    c_argtype;      /* Type of arglist (see below) */
 364         short   c_msgflag;              /* Required flags of messages */
 365         short   c_msgmask;              /* Relevant flags of messages */
 366 };
 367
 368 /* Yechh, can't initialize unions */
 369
 370 #define c_minargs c_msgflag             /* Minimum argcount for RAWLIST */
 371 #define c_maxargs c_msgmask             /* Max argcount for RAWLIST */
 372
 373 /*
 374  * Structure used to return a break down of a head
 375  * line (hats off to Bill Joy!)
 376  */
 377
 378 struct headline {
 379         char    *l_from;        /* The name of the sender */
 380         char    *l_tty;         /* His tty string (if any) */
 381         char    *l_date;        /* The entire date string */
 382 };
 383
 384 enum gfield {
 385         GTO     = 1,            /* Grab To: line */
 386         GSUBJECT= 2,            /* Likewise, Subject: line */
 387         GCC     = 4,            /* And the Cc: line */
 388         GBCC    = 8,            /* And also the Bcc: line */
 389
 390         GNL     = 16,           /* Print blank line after */
 391         GDEL    = 32,           /* Entity removed from list */
 392         GCOMMA  = 64,           /* detract puts in commas */
 393         GUA     = 128,          /* User-Agent field */
 394         GMIME   = 256,          /* MIME 1.0 fields */
 395         GMSGID  = 512,          /* a Message-ID */
 396         /*        1024 */       /* unused */
 397         GIDENT  = 2048,         /* From:, Reply-To: and Organization: field */
 398         GREF    = 4096,         /* References: field */
 399         GDATE   = 8192,         /* Date: field */
 400         GFULL   = 16384,        /* include full names */
 401         GSKIN   = 32768,        /* skin names */
 402         GEXTRA  = 65536,        /* extra fields */
 403         GFILES  = 131072        /* include filename addresses */
 404 };
 405
 406 #define GMASK   (GTO|GSUBJECT|GCC|GBCC) /* Mask of places from whence */
 407
 408 #define visible(mp)     (((mp)->m_flag&(MDELETED|MHIDDEN|MKILL))==0|| \
 409                                 dot==(mp) && (mp)->m_flag&MKILL)
 410
 411 /*
 412  * Structure used to pass about the current
 413  * state of the user-typed message header.
 414  */
 415
 416 struct header {
 417         struct name *h_to;              /* Dynamic "To:" string */
 418         char *h_subject;                /* Subject string */
 419         struct name *h_cc;              /* Carbon copies string */
 420         struct name *h_bcc;             /* Blind carbon copies */
 421         struct name *h_ref;             /* References */
 422         struct name *h_smopts;          /* Sendmail options */
 423         struct attachment *h_attach;    /* MIME attachments */
 424         char    *h_charset;             /* preferred charset */
 425         struct name *h_from;            /* overridden "From:" field */
 426         struct name *h_replyto;         /* overridden "Reply-To:" field */
 427         struct name *h_sender;          /* overridden "Sender:" field */
 428         char *h_organization;           /* overridden "Organization:" field */
 429 };
 430
 431 /*
 432  * Structure of namelist nodes used in processing
 433  * the recipients of mail and aliases and all that
 434  * kind of stuff.
 435  */
 436
 437 struct name {
 438         struct  name *n_flink;          /* Forward link in list. */
 439         struct  name *n_blink;          /* Backward list link */
 440         enum gfield     n_type;         /* From which list it came */
 441         char    *n_name;                /* This fella's name */
 442         char    *n_fullname;            /* Sometimes, name including comment */
 443 };
 444
 445 /*
 446  * Structure of a MIME attachment.
 447  */
 448
 449 struct attachment {
 450         struct attachment *a_flink;     /* Forward link in list. */
 451         struct attachment *a_blink;     /* Backward list link */
 452         char    *a_name;                /* file name */
 453         char    *a_content_type;        /* content type */
 454         char    *a_content_disposition; /* content disposition */
 455         char    *a_content_id;          /* content id */
 456         char    *a_content_description; /* content description */
 457         char    *a_charset;             /* character set */
 458         int     a_msgno;                /* message number */
 459 };
 460
 461 /*
 462  * Structure of a variable node.  All variables are
 463  * kept on a singly-linked list of these, rooted by
 464  * "variables"
 465  */
 466
 467 struct var {
 468         struct  var *v_link;            /* Forward link to next variable */
 469         char    *v_name;                /* The variable's name */
 470         char    *v_value;               /* And it's current value */
 471 };
 472
 473 struct group {
 474         struct  group *ge_link;         /* Next person in this group */
 475         char    *ge_name;               /* This person's user name */
 476 };
 477
 478 struct grouphead {
 479         struct  grouphead *g_link;      /* Next grouphead in list */
 480         char    *g_name;                /* Name of this group */
 481         struct  group *g_list;          /* Users in group. */
 482 };
 483
 484 /*
 485  * Structure of the hash table of ignored header fields
 486  */
 487 struct ignoretab {
 488         int i_count;                    /* Number of entries */
 489         struct ignore {
 490                 struct ignore *i_link;  /* Next ignored field in bucket */
 491                 char *i_field;          /* This ignored field */
 492         } *i_head[HSHSIZE];
 493 };
 494
 495 /*
 496  * Token values returned by the scanner used for argument lists.
 497  * Also, sizes of scanner-related things.
 498  */
 499 enum ltoken {
 500         TEOL    = 0,                    /* End of the command line */
 501         TNUMBER = 1,                    /* A message number */
 502         TDASH   = 2,                    /* A simple dash */
 503         TSTRING = 3,                    /* A string (possibly containing -) */
 504         TDOT    = 4,                    /* A "." */
 505         TUP     = 5,                    /* An "^" */
 506         TDOLLAR = 6,                    /* A "$" */
 507         TSTAR   = 7,                    /* A "*" */
 508         TOPEN   = 8,                    /* An '(' */
 509         TCLOSE  = 9,                    /* A ')' */
 510         TPLUS   = 10,                   /* A '+' */
 511         TERROR  = 11,                   /* A lexical error */
 512         TCOMMA  = 12,                   /* A ',' */
 513         TSEMI   = 13,                   /* A ';' */
 514         TBACK   = 14                    /* A '`' */
 515 };
 516
 517 #define REGDEP  2                       /* Maximum regret depth. */
 518
 519 /*
 520  * Constants for conditional commands.  These describe whether
 521  * we should be executing stuff or not.
 522  */
 523 enum condition {
 524         CANY    = 0,    /* Execute in send or receive mode */
 525         CRCV    = 1,    /* Execute in receive mode only */
 526         CSEND   = 2,    /* Execute in send mode only */
 527         CTERM   = 3,    /* Execute only if stdin is a tty */
 528         CNONTERM= 4     /* Execute only if stdin not tty */
 529 };
 530
 531 /*
 532  * For the 'shortcut' and 'unshortcut' functionality.
 533  */
 534 struct shortcut {
 535         struct shortcut *sh_next;       /* next shortcut in list */
 536         char    *sh_short;              /* shortcut string */
 537         char    *sh_long;               /* expanded form */
 538 };
 539
 540 /*
 541  * Kludges to handle the change from setexit / reset to setjmp / longjmp
 542  */
 543
 544 #define setexit()       sigsetjmp(srbuf, 1)
 545 #define reset(x)        siglongjmp(srbuf, x)
 546
 547 /*
 548  * Locale-independent character classes.
 549  */
 550 enum {
 551         C_CNTRL = 0000,
 552         C_BLANK = 0001,
 553         C_WHITE = 0002,
 554         C_SPACE = 0004,
 555         C_PUNCT = 0010,
 556         C_OCTAL = 0020,
 557         C_DIGIT = 0040,
 558         C_UPPER = 0100,
 559         C_LOWER = 0200
 560 };
 561
 562 extern const unsigned char      class_char[];
 563
 564 #define asciichar(c) ((unsigned)(c) <= 0177)
 565 #define alnumchar(c) (asciichar(c)&&(class_char[c]&\
 566                         (C_DIGIT|C_OCTAL|C_UPPER|C_LOWER)))
 567 #define alphachar(c) (asciichar(c)&&(class_char[c]&(C_UPPER|C_LOWER)))
 568 #define blankchar(c) (asciichar(c)&&(class_char[c]&(C_BLANK)))
 569 #define cntrlchar(c) (asciichar(c)&&(class_char[c]==C_CNTRL))
 570 #define digitchar(c) (asciichar(c)&&(class_char[c]&(C_DIGIT|C_OCTAL)))
 571 #define lowerchar(c) (asciichar(c)&&(class_char[c]&(C_LOWER)))
 572 #define punctchar(c) (asciichar(c)&&(class_char[c]&(C_PUNCT)))
 573 #define spacechar(c) (asciichar(c)&&(class_char[c]&(C_BLANK|C_SPACE|C_WHITE)))
 574 #define upperchar(c) (asciichar(c)&&(class_char[c]&(C_UPPER)))
 575 #define whitechar(c) (asciichar(c)&&(class_char[c]&(C_BLANK|C_WHITE)))
 576 #define octalchar(c) (asciichar(c)&&(class_char[c]&(C_OCTAL)))
 577
 578 #define upperconv(c) (lowerchar(c) ? (c)-'a'+'A' : (c))
 579 #define lowerconv(c) (upperchar(c) ? (c)-'A'+'a' : (c))
 580 /*      RFC 822, 3.2.   */
 581 #define fieldnamechar(c) (asciichar(c)&&(c)>040&&(c)!=0177&&(c)!=':')
 582
 583 /*
 584  * Truncate a file to the last character written. This is
 585  * useful just before closing an old file that was opened
 586  * for read/write.
 587  */
 588 #define trunc(stream) {                                                 \
 589         fflush(stream);                                                 \
 590         ftruncate(fileno(stream), (off_t)ftell(stream));                \
 591 }
 592
 593 /*
 594  * Use either alloca() or smalloc()/free(). ac_alloc can be used to
 595  * allocate space within a function. ac_free must be called when the
 596  * space is no longer needed, but expands to nothing if using alloca().
 597  */
 598 #ifdef  HAVE_ALLOCA
 599 #define ac_alloc(n)     alloca(n)
 600 #define ac_free(n)
 601 #else   /* !HAVE_ALLOCA */
 602 #define ac_alloc(n)     smalloc(n)
 603 #define ac_free(n)      free(n)
 604 #endif  /* !HAVE_ALLOCA */
 605
 606 /*
 607  * glibc uses the slow thread-safe getc() even if _REENTRANT is not
 608  * defined. Work around it.
 609  */
 610 #ifdef  __GLIBC__
 611 #undef  getc
 612 #define getc(c)         getc_unlocked(c)
 613 #undef  putc
 614 #define putc(c, f)      putc_unlocked(c, f)
 615 #undef  putchar
 616 #define putchar(c)      putc_unlocked((c), stdout)
 617 #endif  /* __GLIBC__ */
 618
 619 #define CBAD            (-15555)
 620
 621 #define smin(a, b)      ((a) < (b) ? (a) : (b))
 622 #define smax(a, b)      ((a) < (b) ? (b) : (a))
 623
 624 /*
 625  * For saving the current directory and later returning.
 626  */
 627 #ifdef  HAVE_FCHDIR
 628 struct  cw {
 629         int     cw_fd;
 630 };
 631 #else   /* !HAVE_FCHDIR */
 632 struct  cw {
 633         char    cw_wd[PATHSIZE];
 634 };
 635 #endif  /* !HAVE_FCHDIR */
 636
 637 #ifdef  USE_SSL
 638 enum ssl_vrfy_level {
 639         VRFY_IGNORE,
 640         VRFY_WARN,
 641         VRFY_ASK,
 642         VRFY_STRICT
 643 };
 644 #endif  /* USE_SSL */