+/* Copyright (c) 1979 Regents of the University of California */
+#
+
+#include <local.h>
+#include <sys/types.h>
+#include <signal.h>
+#include <stdio.h>
+
+#undef isalpha
+#undef isdigit
+
+/*
+ * Mail -- a mail program
+ *
+ * Commands are:
+ * t <message list> print out these messages
+ * r <message list> reply to messages
+ * m <user list> mail to users (analogous to send)
+ * e <message list> edit messages
+ * c [directory] chdir to dir or home if none
+ * x exit quickly
+ * w <message list> file save messages in file
+ * q quit, save remaining stuff in mbox
+ * d <message list> delete messages
+ * u <message list> undelete messages
+ * h print message headers
+ *
+ * Author: Kurt Shoens (UCB) March 25, 1978
+ */
+
+
+#define ESCAPE '~' /* Default escape for sending */
+#define NMLSIZE 20 /* max names in a message list */
+#define PATHSIZE 35 /* Size of pathnames throughout */
+#define NAMESIZE 20 /* Max size of user name */
+#define HSHSIZE 19 /* Hash size for aliases and vars */
+#define HDRFIELDS 3 /* Number of header fields */
+#define LINESIZE 512 /* max readable line width */
+#define SCREEN 18 /* screen size in lines (effective) */
+#define STRINGSIZE ((unsigned) 128)/* Dynamic allocation units */
+#define MAXARGC 20 /* Maximum list of raw strings */
+#define NOSTR ((char *) 0) /* Null string pointer */
+#define equal(a, b) (strcmp(a,b)==0)/* A nice function to string compare */
+
+struct message {
+ flag_t m_flag; /* flags, see below */
+ int m_block; /* block number of this message */
+ int m_offset; /* offset in block of message */
+ unsigned m_size; /* Bytes in the message */
+ int m_lines; /* Lines in the message */
+};
+
+/*
+ * flag bits.
+ */
+
+#define MUSED 1 /* entry is used, but this bit isn't */
+#define MDELETED 2 /* entry has been deleted */
+#define MSAVED 4 /* entry has been saved */
+#define MTOUCH 8 /* entry has been noticed */
+#define MPRESERVE 16 /* keep entry in sys mailbox */
+#define MMARK 32 /* message is marked! */
+#define MODIFY 64 /* message has been modified */
+
+/*
+ * Format of the command description table.
+ * The actual table is declared and initialized
+ * in lex.c
+ */
+
+struct cmd {
+ char *c_name; /* Name of command */
+ int (*c_func)(); /* Implementor of the command */
+ flag_t c_argtype; /* Type of arglist (see below) */
+ flag_t c_msgflag; /* Required flags of messages */
+ flag_t c_msgmask; /* Relevant flags of messages */
+};
+
+/* Yechh, can't initialize unions */
+
+#define c_minargs c_msgflag /* Minimum argcount for RAWLIST */
+#define c_maxargs c_msgmask /* Max argcount for RAWLIST */
+
+/*
+ * Argument types.
+ */
+
+#define MSGLIST 0 /* Message list type */
+#define STRLIST 1 /* A pure string */
+#define RAWLIST 2 /* Shell string list */
+#define NOLIST 3 /* Just plain 0 */
+#define NDMLIST 4 /* Message list, no defaults */
+
+#define P 040 /* Autoprint dot after command */
+#define I 0100 /* Interactive command bit */
+#define M 0200 /* Illegal from send mode bit */
+
+/*
+ * Oft-used mask values
+ */
+
+#define MMNORM (MDELETED|MSAVED)/* Look at both save and delete bits */
+#define MMNDEL MDELETED /* Look only at deleted bit */
+
+/*
+ * Structure used to return a break down of a head
+ * line (hats off to Bill Joy!)
+ */
+
+struct headline {
+ char *l_from; /* The name of the sender */
+ char *l_tty; /* His tty string (if any) */
+ char *l_date; /* The entire date string */
+};
+
+#define GTO 1 /* Grab To: line */
+#define GSUBJ 2 /* Likewise, Subj: line */
+#define GCC 4 /* And the Cc: line */
+
+/*
+ * Structure used to pass about the current
+ * state of the user-typed message header.
+ */
+
+struct header {
+ char *h_to; /* Dynamic "To:" string */
+ char *h_subj; /* Subject string */
+ char *h_cc; /* Carbon copies string */
+ int h_seq; /* Sequence for optimization */
+};
+
+/*
+ * Structure of namelist nodes used in processing
+ * the recipients of mail and aliases and all that
+ * kind of stuff.
+ */
+
+struct name {
+ struct name *n_flink; /* Forward link in list. */
+ struct name *n_blink; /* Backward list link */
+ char *n_name; /* This fella's name */
+};
+
+/*
+ * Structure of a variable node. All variables are
+ * kept on a singly-linked list of these, rooted by
+ * "variables"
+ */
+
+struct var {
+ struct var *v_link; /* Forward link to next variable */
+ char *v_name; /* The variable's name */
+ char *v_value; /* And it's current value */
+};
+
+struct group {
+ struct group *ge_link; /* Next person in this group */
+ char *ge_name; /* This person's user name */
+};
+
+struct grouphead {
+ struct grouphead *g_link; /* Next grouphead in list */
+ char *g_name; /* Name of this group */
+ struct group *g_list; /* Users in group. */
+};
+
+#define NIL ((struct name *) 0) /* The nil pointer for namelists */
+#define NONE ((struct cmd *) 0) /* The nil pointer to command tab */
+#define NOVAR ((struct var *) 0) /* The nil pointer to variables */
+#define NOGRP ((struct grouphead *) 0)/* The nil grouphead pointer */
+#define NOGE ((struct group *) 0) /* The nil group pointer */
+
+/*
+ * Token values returned by the scanner used for argument lists.
+ * Also, sizes of scanner-related things.
+ */
+
+#define TEOL 0 /* End of the command line */
+#define TNUMBER 1 /* A message number */
+#define TDASH 2 /* A simple dash */
+#define TSTRING 3 /* A string (possibly containing -) */
+#define TDOT 4 /* A "." */
+#define TUP 5 /* An "^" */
+#define TDOLLAR 6 /* A "$" */
+#define TSTAR 7 /* A "*" */
+#define TOPEN 8 /* An '(' */
+#define TCLOSE 9 /* A ')' */
+
+#define REGDEP 2 /* Maximum regret depth. */
+#define STRINGLEN 16 /* Maximum length of string token */
+
+/*
+ * Forward declarations of routine types to keep lint and cc happy.
+ */
+
+FILE *collect();
+FILE *infix();
+FILE *mesedit();
+FILE *mespipe();
+FILE *setinput();
+char **unpack();
+char *addto();
+char *calloc();
+char *copy();
+char *gets();
+char *hfield();
+char *nameof();
+char *nextword();
+char *getenv();
+char *readtty();
+char *salloc();
+char *savestr();
+char *savestr();
+char *snarf();
+char *value();
+char *vcopy();
+char *yankword();
+off_t fsize();
+struct cmd *lex();
+struct grouphead *findgroup();
+struct name *cat();
+struct name *elide();
+struct name *extract();
+struct name *map();
+struct name *outof();
+struct name *put();
+struct name *usermap();
+struct name *verify();
+struct var *lookup();
+unsigned int msize();
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