new.c: Order two return statements to match comment.

[nmh] / sbr / m_getfld.c

diff --git a/sbr/m_getfld.c b/sbr/m_getfld.c
index 9a95fb89d739065966873147eee2ac9a0080323d..f5fa9a4ebe93abfcb585b6375f0be6d0e7309282 100644 (file)
--- a/sbr/m_getfld.c
+++ b/sbr/m_getfld.c
@@ -1,6 +1,4 @@
-
-/*
- * m_getfld.c -- read/parse a message
+/* m_getfld.c -- read/parse a message

  *
  * This code is Copyright (c) 2002, by the authors of nmh.  See the
  * COPYRIGHT file in the root directory of the nmh distribution for
  *
  * This code is Copyright (c) 2002, by the authors of nmh.  See the
  * COPYRIGHT file in the root directory of the nmh distribution for


@@ -10,6 +8,75 @@
 #include <h/mh.h>
 #include <h/mts.h>
 #include <h/utils.h>
 #include <h/mh.h>
 #include <h/mts.h>
 #include <h/utils.h>

+#include <inttypes.h>
+
+/*
+   Purpose
+   =======
+   Reads an Internet message (RFC 5322), or one or more messages
+   stored in a maildrop in mbox (RFC 4155) or MMDF format, from a file
+   stream.  Each call to m_getfld() reads one header field, or a
+   portion of the body, in sequence.
+
+   Inputs
+   ======
+   gstate:  opaque parse state
+   bufsz:  maximum number of characters to load into buf
+   iob:  input file stream
+
+   Outputs
+   =======
+   name:  header field name (array of size NAMESZ=999)
+   buf:  either a header field body or message body
+   bufsz:  number of characters loaded into buf
+   (return value):  message parse state on return from function
+
+   Functions
+   =========
+   void m_getfld_state_destroy (m_getfld_state_t *gstate): destroys
+   the parse state pointed to by the gstate argument.
+
+   m_getfld_state_reset (m_getfld_state_t *gstate): resets the parse
+   state to FLD.
+
+   void m_unknown(FILE *iob):  Determines the message delimiter string
+   for the maildrop.  Called by inc and scan when reading from a
+   maildrop file.
+
+   State variables
+   ===============
+   m_getfld() retains state internally between calls in the
+   m_getfld_state_t variable.  These are used for detecting the end of
+   each message when reading maildrops:
+
+     char **pat_map
+     char *fdelim
+     char *delimend
+     int fdelimlen
+     char *edelim
+     int edelimlen
+     char *msg_delim
+     int msg_style
+
+   Usage
+   =====
+   m_getfld_state_t gstate;
+
+   gstate = m_getfld_state_init(mailfp);
+   Perhaps m_getfld_track_filepos2(&gstate);
+   ...
+      state = m_getfld2(&gstate, ...);
+      ...Repeat until finished with mailfp.
+   m_getfld_state_destroy (&gstate);
+
+   The state is retained internally by gstate.  To reset its state to FLD:
+   m_getfld_state_reset (&gstate);
+*/
+
+/* The following described the old implementation.  The high-level
+   structure hasn't changed, but some of the details have.  I'm
+   leaving this as-is, though, for posterity.
+ */

 
 /* This module has a long and checkered history.  First, it didn't burst
    maildrops correctly because it considered two CTRL-A:s in a row to be
 
 /* This module has a long and checkered history.  First, it didn't burst
    maildrops correctly because it considered two CTRL-A:s in a row to be


@@ -25,9 +92,9 @@
    be parsed as well.  Unfortunately the speed issue finally caught up with
    us since this routine is at the very heart of MH.
 
    be parsed as well.  Unfortunately the speed issue finally caught up with
    us since this routine is at the very heart of MH.
 

-   To speed things up considerably, the routine Eom() was made an auxilary
+   To speed things up considerably, the routine Eom() was made an auxiliary

    function called by the macro eom().  Unless we are bursting a maildrop,
    function called by the macro eom().  Unless we are bursting a maildrop,

-   the eom() macro returns FALSE saying we aren't at the end of the
+   the eom() macro returns false saying we aren't at the end of the

    message.
 
    The next thing to do is to read the mts.conf file and initialize
    message.
 
    The next thing to do is to read the mts.conf file and initialize


@@ -94,7 +161,7 @@
    names are typically short (~8 char) and the loop that extracts them
    might terminate on a colon, newline or max width.  I considered
    using a Vax "scanc" to locate the end of the field followed by a
    names are typically short (~8 char) and the loop that extracts them
    might terminate on a colon, newline or max width.  I considered
    using a Vax "scanc" to locate the end of the field followed by a

-   "bcopy" but the routine call overhead on a Vax is too large for this
+   "memmove" but the routine call overhead on a Vax is too large for this

    to work on short names.  If Berkeley ever makes "inline" part of the
    C optimiser (so things like "scanc" turn into inline instructions) a
    change here would be worthwhile.
    to work on short names.  If Berkeley ever makes "inline" part of the
    C optimiser (so things like "scanc" turn into inline instructions) a
    change here would be worthwhile.


@@ -110,7 +177,7 @@
    so message bodies average at least a few hundred characters.
    Assuming your system uses reasonably sized stdio buffers (1K or
    more), this routine should be able to remove the body in large
    so message bodies average at least a few hundred characters.
    Assuming your system uses reasonably sized stdio buffers (1K or
    more), this routine should be able to remove the body in large

-   (>500 byte) chunks.  The makes the cost of a call to "bcopy"
+   (>500 byte) chunks.  The makes the cost of a call to "memmove"

    small but there is a premium on checking for the eom in packed
    maildrops.  The eom pattern is always a simple string so we can
    construct an efficient pattern matcher for it (e.g., a Vax "matchc"
    small but there is a premium on checking for the eom in packed
    maildrops.  The eom pattern is always a simple string so we can
    construct an efficient pattern matcher for it (e.g., a Vax "matchc"


@@ -134,73 +201,22 @@
    there is data in "name" or "buf").
   */
 
    there is data in "name" or "buf").
   */
 

-/*
-Purpose
-=======
-Reads an Internet message (RFC 5322), or one or more messages stored in a
-maildrop in mbox (RFC 4155) or MMDF format, from a file stream.  Each call
-to m_getfld() reads one header field, or a portion of the body, in sequence.
-
-Inputs
-======
-gstate:  opaque parse state
-bufsz:  maximum number of characters to load into buf
-iob:  input file stream
-
-Outputs
-=======
-name:  header field name (array of size NAMESZ=999)
-buf:  either a header field body or message body
-bufsz:  number of characters loaded into buf
-(return value):  message parse state on return from function
-
-Functions
-=========
-void m_unknown(FILE *iob):  Determines the message delimiter string for the
-  maildrop.  Called by inc, scan, and msh when reading from a maildrop file.
-
-void m_eomsbr (int (*action)(int)):  Sets the hook to check for end of
-  message in a maildrop.  Called only by msh.
-
-State variables
-===============
-m_getfld() retains state internally between calls in the m_getfld_state_t
-variable.  These are used for detecting the end of each message when reading
-maildrops:
-
-  unsigned char **pat_map
-  unsigned char *fdelim
-  unsigned char *delimend
-  int fdelimlen
-  unsigned char *edelim
-  int edelimlen
-  char *msg_delim
-  int msg_style
-  int (*eom_action)(int)
-
-Usage
-=====
-    m_getfld_state_t gstate;
-    m_getfld_state_init (&gstate);
-    int state = m_getfld (gstate, ...);
-       ...
-    m_getfld_state_destroy (&gstate);
-
-The state is retained internally by gstate.  To reset its state to FLD:
-
-    m_getfld_state_reset (&gstate);
-*/
-

 /*
  * static prototypes
  */
 /*
  * static prototypes
  */

-struct m_getfld_state;
-static int m_Eom (m_getfld_state_t, int);
-static unsigned char *matchc(int, char *, int, char *);
+static void Ungetc(m_getfld_state_t s);
+static int m_Eom (m_getfld_state_t);

 
 #define eom(c,s)       (s->msg_style != MS_DEFAULT && \
 
 #define eom(c,s)       (s->msg_style != MS_DEFAULT && \

-                        (((c) == *s->msg_delim && m_Eom(s,c)) || \
-                         (s->eom_action && (*s->eom_action)(c))))
+                        ((c) == *s->msg_delim && m_Eom(s)))
+
+/*
+ * Maildrop styles
+ */
+#define        MS_DEFAULT      0       /* default (one msg per file) */
+#define        MS_UNKNOWN      1       /* type not known yet         */
+#define        MS_MBOX         2       /* Unix-style "from" lines    */
+#define        MS_MMDF         3       /* string MMDF_DELIM          */

 
 /* This replaces the old approach, with its direct access to stdio
  * internals.  It uses one fread() to load a buffer that we manage.
 
 /* This replaces the old approach, with its direct access to stdio
  * internals.  It uses one fread() to load a buffer that we manage.


@@ -210,77 +226,148 @@ static unsigned char *matchc(int, char *, int, char *);
  * separate messages in a maildrop, such as mbox "From ".
  *
  * Some of the tests in the test suite assume a MSG_INPUT_SIZE
  * separate messages in a maildrop, such as mbox "From ".
  *
  * Some of the tests in the test suite assume a MSG_INPUT_SIZE

- * of 8192. */
-#define MSG_INPUT_SIZE (BUFSIZ >= 1024 ? BUFSIZ : 1024)
+ * of 8192.
+ */
+#define MSG_INPUT_SIZE NMH_BUFSIZ

 #define MAX_DELIMITER_SIZE 5
 
 struct m_getfld_state {
 #define MAX_DELIMITER_SIZE 5
 
 struct m_getfld_state {

-    unsigned char msg_buf[2 * MSG_INPUT_SIZE + MAX_DELIMITER_SIZE];
-    unsigned char *readpos;
-    unsigned char *end;  /* One past the last character read in. */
-    /* The following support tracking of the read position in the
-       input file stream so that callers can interleave m_getfld()
-       calls with ftell() and fseek().  ytes_read replaces the old
-       m_getfld() msg_count global.  last_caller_pos is stored when
-       leaving m_getfld()/m_unknown(), then checked on the next entry.
-       last_internal_pos is used to remember the position used
-       internally by m_getfld() (read_more(), actually). */
+    /* The file to read from;  I/O block.  Caller keeps passing it after
+     * initialisation due to historic interface so it keeps getting
+     * updated, presumably to the same value. */
+    FILE *iob;
+
+    /* Holds content of iob. */
+    char msg_buf[2 * MSG_INPUT_SIZE + MAX_DELIMITER_SIZE];
+    /* Points to the next byte to read from msg_buf. */
+    char *readpos;
+    /* Points to just after the last valid byte in msg_buf.  If readpos
+     * equals end then msg_buf is empty. */
+    char *end;
+
+    /* Whether the caller intends to ftell(3)/fseek(3) iob's position,
+     * and thus whether m_getfld() needs to detect that and compensate. */
+    int track_filepos;
+    /* Position in iob given what's been consumed ready for returning to
+     * the caller.  Further than this may have been read into msg_buf. */
+    off_t total_bytes_read;
+    /* Bytes of iob consumed during this call. */

     off_t bytes_read;
     off_t bytes_read;

-    off_t total_bytes_read; /* by caller, not necessarily from input file */
+    /* What fseeko(3) tells us iob's position is having just explicitly
+     * set it to total_bytes_read.  Surely always the same? */

     off_t last_caller_pos;
     off_t last_caller_pos;

+    /* Saved position in iob from filling msg_buf, prior to returning. */

     off_t last_internal_pos;
     off_t last_internal_pos;

-    FILE *iob;

 
 

-    unsigned char **pat_map;
+    /* One of the MS_* macros tracking the type of iob's content and
+     * thus if it's a single email, or several with delimeters.  Default
+     * is MS_DEFAULT. */

     int msg_style;
     int msg_style;

-    /*
-     * The "full" delimiter string for a packed maildrop consists
-     * of a newline followed by the actual delimiter.  E.g., the
-     * full string for a Unix maildrop would be: "\n\nFrom ".
-     * "Fdelim" points to the start of the full string and is used
-     * in the BODY case of the main routine to search the buffer for
-     * a possible eom.  Msg_delim points to the first character of
-     * the actual delim. string (i.e., fdelim+1).  Edelim
-     * points to the 2nd character of actual delimiter string.  It
-     * is used in m_Eom because the first character of the string
-     * has been read and matched before m_Eom is called.
-     */
+
+    /* The message delimeter if iob has multiple emails, else NULL.  For
+     * MS_MBOX it's the string that separates two emails, "\nFrom ",
+     * i.e. the terminating blank line of the previous email, and the
+     * starting From_ line of the next, but for MS_MMDF it's
+     * "\001\001\001\001\n" that may start or terminate an email. */

     char *msg_delim;
     char *msg_delim;

-    unsigned char *fdelim;
-    unsigned char *delimend;
+    /* The last non-NUL char of msg_delim. */
+    char *delimend;
+    /* When searching for msg_delim after an email, it's only of
+     * interest at the start of the line, i.e. when preceded by a
+     * linefeed.  fdelim points to msg_delim[-1] that contains '\n' so
+     * it can be used as the needle. */
+    char *fdelim;
+    /* strlen(fdelim). */

     int fdelimlen;
     int fdelimlen;

-    unsigned char *edelim;
+    /* The second char of msg_delim.  Used when the first char has
+     * already been matched to test the rest. */
+    char *edelim;
+    /* strlen(edelim). */

     int edelimlen;
     int edelimlen;

-    int (*eom_action)(int);
+    /* The relationship between all of these pointers and lengths for
+     * the two possible msg_delim values.
+     *
+     *     "\0\n\nFrom \0"   9              "\0\n\001\001\001\001\n\0"   8
+     *         | ||   |                         |   |   |         |
+     *         | ||   s->delimend               |   |   |         s->delimend
+     *         | ||                             |   |   |
+     *         | |s->edelim  s->edelimlen=5     |   |   s->edelim  s->edelimlen=4
+     *         | |                              |   |
+     *         | s->msg_delim                   |   s->msg_delim
+     *         |                                |
+     *         s->fdelim  s->fdelimlen=7        s->fdelim  s->fdelimlen=6
+     */
+
+    /* Maps all the bytes of msg_delim, apart from the last two,
+     * including the NUL, onto the last position in msg_delim where they
+     * occur.  Bytes not present are NULL. */
+    char **pat_map;
+
+    /* The parser's current state.  Also returned to the caller, amongst
+     * other possible values, to indicate the token consumed.  One of
+     * FLD, FLDPLUS, BODY, or FILEEOF. */

     int state;
 };
 
     int state;
 };
 

+m_getfld_state_t m_getfld_state_init(FILE *iob)
+{
+    m_getfld_state_t s;
+
+    NEW(s);
+    s->readpos = s->end = s->msg_buf;
+    s->bytes_read = s->total_bytes_read = 0;
+    s->last_caller_pos = s->last_internal_pos = 0;
+    s->iob = iob;
+    s->pat_map = NULL;
+    s->msg_style = MS_DEFAULT;
+    s->msg_delim = "";
+    s->fdelim = s->delimend = s->edelim = NULL;
+    s->fdelimlen = s->edelimlen = 0;
+    s->state = FLD;
+    s->track_filepos = 0;
+
+    return s;
+}
+
+/* scan() needs to force an initial state of FLD for each message. */

 void
 void

-m_getfld_state_init (m_getfld_state_t *s) {
-    *s = (m_getfld_state_t) mh_xmalloc(sizeof (struct m_getfld_state));
-    (*s)->readpos = (*s)->end = (*s)->msg_buf;
-    (*s)->bytes_read = (*s)->total_bytes_read = 0;
-    (*s)->last_caller_pos = (*s)->last_internal_pos = 0;
-    /* (*s)->iob gets loaded on every call to m_getfld()/m_unknown(). */
-    (*s)->pat_map = NULL;
-    (*s)->msg_style = MS_DEFAULT;
-    (*s)->msg_delim = "";
-    (*s)->fdelim = (*s)->delimend = (*s)->edelim = NULL;
-    (*s)->fdelimlen = (*s)->edelimlen = 0;
-    (*s)->eom_action = NULL;
-    (*s)->state = FLD;
+m_getfld_state_reset (m_getfld_state_t *gstate) {
+    if (*gstate) {
+       (*gstate)->state = FLD;
+    }

 }
 
 }
 

-/* scan() needs to force a state an initial state of FLD for each message. */
+/* If the caller interleaves ftell*()/fseek*() calls with m_getfld()
+   calls, m_getfld() must keep track of the file position.  The caller
+   must use this function to inform m_getfld(). */

 void
 void

-m_getfld_state_reset (m_getfld_state_t *s) {
-    (*s)->state = FLD;
+m_getfld_track_filepos (m_getfld_state_t *gstate, FILE *iob) {
+    if (! *gstate) {
+       *gstate = m_getfld_state_init(iob);
+    }
+
+    (*gstate)->track_filepos = 1;
+}
+
+/* m_getfld_track_filepos() with the existing iob. */
+void m_getfld_track_filepos2(m_getfld_state_t *gstate)
+{
+    if (!*gstate)
+       adios(NULL, "m_getfld_track_filepos2 without gstate");
+
+    m_getfld_track_filepos(gstate, (*gstate)->iob);

 }
 
 }
 

-void m_getfld_state_destroy (m_getfld_state_t *s) {
-    if (*s) {
-       free (*s);
-       *s = 0;
+void m_getfld_state_destroy (m_getfld_state_t *gstate) {
+    m_getfld_state_t s = *gstate;
+
+    if (s) {
+       if (s->fdelim) {
+           free (s->fdelim-1);
+           free (s->pat_map);
+       }
+       free (s);
+       *gstate = 0;

     }
 }
 
     }
 }
 


@@ -314,74 +401,113 @@ void m_getfld_state_destroy (m_getfld_state_t *s) {
 
 
 static void
 
 
 static void

-enter_getfld (m_getfld_state_t s, FILE *iob) {
+enter_getfld (m_getfld_state_t *gstate, FILE *iob) {
+    m_getfld_state_t s;

     off_t pos;
     off_t pos;

+    off_t pos_movement;
+
+    if (! *gstate) {
+       *gstate = m_getfld_state_init(iob);
+    }
+    s = *gstate;
+    s->bytes_read = 0;

 
 

-    /* Ugly.  The parser opens the input file multiple times, so we
-       have to always use the FILE * that's passed to m_getfld(). */
+    /* This is ugly and no longer necessary, but is retained just in
+       case it's needed again.  The parser used to open the input file
+       multiple times, so we had to always use the FILE * that's
+       passed to m_getfld().  Now the parser inits a new
+       m_getfld_state for each file.  See comment below about the
+       readpos shift code being currently unused. */

     s->iob = iob;
 
     s->iob = iob;
 

-    pos = ftello (iob);
-
-    if (pos != 0) {
-       off_t pos_movement = pos - s->last_caller_pos; /* Can be < 0. */
-
-       if (pos_movement == 0) {
-           pos = s->last_internal_pos;
-       } else {
-           /* The current file stream position differs from the last
-              one, so caller must have called ftell/o().  Or, this is
-              the first call and the file position was not at 0. */
-
-           if (s->readpos + pos_movement >= s->msg_buf  &&
-               s->readpos + pos_movement < s->end) {
-               /* We can shift readpos and remain within the bounds of
-                  msg_buf. */
-               s->readpos += pos_movement;
-               s->total_bytes_read += pos_movement;
-               pos = s->last_internal_pos;
-           } else {
-               size_t num_read;
-
-               /* This seek skips past an integral number of chunks of
-                  size MSG_INPUT_SIZE. */
-               fseeko (iob, pos / MSG_INPUT_SIZE * MSG_INPUT_SIZE, SEEK_SET);
-               num_read = fread (s->msg_buf, 1, MSG_INPUT_SIZE, iob);
-               s->readpos = s->msg_buf  +  pos % MSG_INPUT_SIZE;
-               s->end = s->msg_buf + num_read;
-               s->total_bytes_read = pos;
-           }
-       }
+    if (!s->track_filepos)
+        return;

 
 

-       if (s->last_internal_pos != 0) fseeko (iob, pos, SEEK_SET);
+    if ((pos = ftello(iob)) == -1)
+        adios("getfld's iob", "failed to get offset on entry");
+    if (pos == 0 && s->last_internal_pos == 0)
+        return;
+
+    if (s->last_internal_pos == 0) {
+        s->total_bytes_read = pos;
+        return;

     }
 
     }
 

-    s->bytes_read = 0;
+    pos_movement = pos - s->last_caller_pos; /* Can be < 0. */
+    if (pos_movement == 0) {
+        pos = s->last_internal_pos;
+    } else {
+        /* The current file stream position differs from the
+           last one, so caller must have called ftell/o().
+           Or, this is the first call and the file position
+           was not at 0. */
+
+        if (s->readpos + pos_movement >= s->msg_buf  &&
+            s->readpos + pos_movement < s->end) {
+            /* This is currently unused.  It could be used by
+               parse_mime() if it was changed to use a global
+               m_getfld_state. */
+            /* We can shift readpos and remain within the
+               bounds of msg_buf. */
+            s->readpos += pos_movement;
+            s->total_bytes_read += pos_movement;
+            pos = s->last_internal_pos;
+        } else {
+            off_t off;
+            size_t num_read;
+
+            /* This seek skips past an integral number of
+               chunks of size MSG_INPUT_SIZE. */
+            off = pos / MSG_INPUT_SIZE * MSG_INPUT_SIZE;
+            if (fseeko(iob, off, SEEK_SET) == -1)
+                adios("getfld's iob", "failed to set offset to skip: "
+                    "%" PRIdMAX, (intmax_t)off);
+            num_read = fread (s->msg_buf, 1, MSG_INPUT_SIZE, iob);
+            s->readpos = s->msg_buf  +  pos % MSG_INPUT_SIZE;
+            s->end = s->msg_buf + num_read;
+            s->total_bytes_read = pos;
+        }
+    }
+
+    if (fseeko(iob, pos, SEEK_SET) == -1)
+        adios("getfld's iob", "failed to set offset on entry: %" PRIdMAX,
+            (intmax_t)pos);

 }
 
 static void
 leave_getfld (m_getfld_state_t s) {
 }
 
 static void
 leave_getfld (m_getfld_state_t s) {

-    /* Save the internal file position that we use for the input buffer. */
-    s->last_internal_pos = ftello (s->iob);
-
-    /* Set file stream position so that callers can use ftell(). */

     s->total_bytes_read += s->bytes_read;
     s->total_bytes_read += s->bytes_read;

-    fseeko (s->iob, s->total_bytes_read, SEEK_SET);
-    s->last_caller_pos = ftello (s->iob);
+
+    if (s->track_filepos) {
+       /* Save the internal file position that we use for the input buffer. */
+        if ((s->last_internal_pos = ftello(s->iob)) == -1)
+            adios("getfld's iob", "failed to get offset before seek");
+
+       /* Set file stream position so that callers can use ftell(). */
+        if (fseeko(s->iob, s->total_bytes_read, SEEK_SET) == -1)
+            adios("getfld's iob", "failed to set offset: %" PRIdMAX,
+                (intmax_t)s->total_bytes_read);
+
+        s->last_caller_pos = s->total_bytes_read;
+    }

 }
 
 static size_t
 read_more (m_getfld_state_t s) {
 }
 
 static size_t
 read_more (m_getfld_state_t s) {

-    /* Retain at least edelimlen characters that have already been
-       read so that we can back up to them in m_Eom(). */
-    ssize_t retain = s->edelimlen;
+    /* Retain at least edelimlen characters that have already been read,
+       if at least edelimlen have been read, so that we can back up to them
+       in m_Eom(). */
+    ssize_t retain = s->end - s->msg_buf < s->edelimlen ? 0 : s->edelimlen;

     size_t num_read;
 
     size_t num_read;
 

-    if (retain < s->end - s->readpos) retain = s->end - s->readpos;
-    /* assert (retain <= s->readpos - s->msg_buf <= sizeof msg_buf); */
+    if (retain > 0) {
+        if (retain < s->end - s->readpos)
+            retain = s->end - s->readpos;
+        assert (retain <= s->readpos - s->msg_buf);

 
 

-    /* Move what we want to retain at end of the buffer to the beginning. */
-    memmove (s->msg_buf, s->readpos - retain, retain);
+        /* Move what we want to retain at end of the buffer to the beginning. */
+        memmove (s->msg_buf, s->readpos - retain, retain);
+    }

 
     s->readpos = s->msg_buf + retain;
     num_read = fread (s->readpos, 1, MSG_INPUT_SIZE, s->iob);
 
     s->readpos = s->msg_buf + retain;
     num_read = fread (s->readpos, 1, MSG_INPUT_SIZE, s->iob);


@@ -390,63 +516,67 @@ read_more (m_getfld_state_t s) {
     return num_read;
 }
 
     return num_read;
 }
 

+/* Return the next character consumed from the input, fetching more of
+ * the input for the buffer if required, or EOF on end of file. */

 static int
 Getc (m_getfld_state_t s) {
 static int
 Getc (m_getfld_state_t s) {

-    if (s->end - s->readpos < 1) {
-       if (read_more (s) == 0) {
-           /* Pretend that we read a character.  That's what stdio does. */
-           ++s->readpos;
-           return EOF;
-       }
-    }
+    if ((s->end - s->readpos < 1 && read_more (s) == 0) ||
+        s->readpos >= s->end)
+        return EOF;

 
 

-    ++s->bytes_read;
-    return s->readpos < s->end  ?  *s->readpos++  :  EOF;
+    s->bytes_read++;
+    return (unsigned char)*s->readpos++;

 }
 
 }
 

+/* Return the next character that Getc() would return, which may be EOF. */

 static int
 static int

-Peek (m_getfld_state_t s) {
-    int next_char = Getc (s);
-    --s->readpos;
-    --s->bytes_read;
+Peek (m_getfld_state_t s)
+{
+    int c;
+
+    c = Getc(s);
+    if (c != EOF)
+        Ungetc(s);

 
 

-    return next_char;
+    return c;

 }
 
 }
 

-static int
-Ungetc (int c, m_getfld_state_t s) {
-    if (s->readpos == s->msg_buf) {
-       return EOF;
-    } else {
-       --s->bytes_read;
-       return *--s->readpos = c;
-    }
+/* If there's room, undo the consumption of one character from msg_buf,
+ * rewinding so it's read next, else die. */
+static void
+Ungetc(m_getfld_state_t s)
+{
+    if (s->readpos == s->msg_buf)
+        adios(NULL, "Ungetc() at start of message buffer.");
+
+    s->readpos--;
+    s->bytes_read--;

 }
 
 
 int
 }
 
 
 int

-m_getfld (m_getfld_state_t s, unsigned char name[NAMESZ], unsigned char *buf,
-          int *bufsz, FILE *iob)
+m_getfld (m_getfld_state_t *gstate, char name[NAMESZ], char *buf, int *bufsz,
+          FILE *iob)

 {
 {

-    register unsigned char *cp;
-    register int max, n, c;
+    m_getfld_state_t s;
+    char *cp;
+    int max, n, c;

 
 

-    enter_getfld (s, iob);
+    enter_getfld (gstate, iob);
+    s = *gstate;

 
 

-    if ((c = Getc(s)) < 0) {
+    if ((c = Getc(s)) == EOF) {

        *bufsz = *buf = 0;
        leave_getfld (s);
        return s->state = FILEEOF;
     }
     if (eom (c, s)) {
        *bufsz = *buf = 0;
        leave_getfld (s);
        return s->state = FILEEOF;
     }
     if (eom (c, s)) {

-       if (! s->eom_action) {
-           /* flush null messages */
-           while ((c = Getc(s)) >= 0 && eom (c, s))
-               ;
+       /* flush null messages */
+       while ((c = Getc(s)) != EOF && eom (c, s))
+           ;

 
 

-           if (c >= 0)
-               Ungetc(c, s);
-       }
+       if (c != EOF)
+            Ungetc(s);

        *bufsz = *buf = 0;
        leave_getfld (s);
        return s->state = FILEEOF;
        *bufsz = *buf = 0;
        leave_getfld (s);
        return s->state = FILEEOF;


@@ -456,16 +586,15 @@ m_getfld (m_getfld_state_t s, unsigned char name[NAMESZ], unsigned char *buf,
        case FLD:
            if (c == '\n' || c == '-') {
                /* we hit the header/body separator */
        case FLD:
            if (c == '\n' || c == '-') {
                /* we hit the header/body separator */

-               while (c != '\n' && (c = Getc(s)) >= 0) continue;
-
-               if (c < 0 || (c = Getc(s)) < 0 || eom (c, s)) {
-                   if (! s->eom_action) {
-                       /* flush null messages */
-                       while ((c = Getc(s)) >= 0 && eom (c, s))
-                           ;
-                       if (c >= 0)
-                           Ungetc(c, s);
-                   }
+               while (c != '\n' && (c = Getc(s)) != EOF)
+                    ;
+
+               if (c == EOF || (c = Getc(s)) == EOF || eom (c, s)) {
+                   /* flush null messages */
+                   while ((c = Getc(s)) != EOF && eom (c, s))
+                       ;
+                   if (c != EOF)
+                        Ungetc(s);

                    *bufsz = *buf = 0;
                    leave_getfld (s);
                    return s->state = FILEEOF;
                    *bufsz = *buf = 0;
                    leave_getfld (s);
                    return s->state = FILEEOF;


@@ -496,7 +625,7 @@ m_getfld (m_getfld_state_t s, unsigned char name[NAMESZ], unsigned char *buf,
                int next_char;
                if (c == EOF  ||  (next_char = Peek (s)) == EOF) {
                    *bufsz = *cp = *buf = 0;
                int next_char;
                if (c == EOF  ||  (next_char = Peek (s)) == EOF) {
                    *bufsz = *cp = *buf = 0;

-                   advise (NULL, "eof encountered in field \"%s\"", name);
+                   inform("eof encountered in field \"%s\"", name);

                    leave_getfld (s);
                    return s->state = FMTERR;
                }
                    leave_getfld (s);
                    return s->state = FMTERR;
                }


@@ -522,35 +651,39 @@ m_getfld (m_getfld_state_t s, unsigned char name[NAMESZ], unsigned char *buf,
                if (*bufsz < n + 1) {
                    /* No, it can't.  Oh well, guess we'll blow up. */
                    *bufsz = *cp = *buf = 0;
                if (*bufsz < n + 1) {
                    /* No, it can't.  Oh well, guess we'll blow up. */
                    *bufsz = *cp = *buf = 0;

-                   advise (NULL, "eol encountered in field \"%s\"", name);
+                   inform("eol encountered in field \"%s\"", name);

                    s->state = FMTERR;
                    break;
                }
                memcpy (buf, name, n - 1);
                buf[n - 1] = '\n';
                buf[n] = '\0';
                    s->state = FMTERR;
                    break;
                }
                memcpy (buf, name, n - 1);
                buf[n - 1] = '\n';
                buf[n] = '\0';

+                /* Indicate this wasn't a header field using a character
+                   that can't appear in a header field. */
+                name[0] = ':';

                /* The last character read was '\n'.  s->bytes_read
                   (and n) include that, but it was not put into the
                   name array in the for loop above.  So subtract 1. */
                *bufsz = --s->bytes_read;  /* == n - 1 */
                leave_getfld (s);
                return s->state = BODY;
                /* The last character read was '\n'.  s->bytes_read
                   (and n) include that, but it was not put into the
                   name array in the for loop above.  So subtract 1. */
                *bufsz = --s->bytes_read;  /* == n - 1 */
                leave_getfld (s);
                return s->state = BODY;

-           } else if (max <= n) {
+           }
+            if (max <= n) {

                /* By design, the loop above discards the last character
                    it had read.  It's in c, use it. */
                *cp++ = c;
                *bufsz = *cp = *buf = 0;
                /* By design, the loop above discards the last character
                    it had read.  It's in c, use it. */
                *cp++ = c;
                *bufsz = *cp = *buf = 0;

-               advise (NULL, "field name \"%s\" exceeds %d bytes", name,
+               inform("field name \"%s\" exceeds %d bytes", name,

                        NAMESZ - 2);
                s->state = LENERR;
                break;
            }
 
            /* Trim any trailing spaces from the end of name. */
                        NAMESZ - 2);
                s->state = LENERR;
                break;
            }
 
            /* Trim any trailing spaces from the end of name. */

-           while (isspace (*--cp) && cp >= name) continue;
+           while (isspace ((unsigned char) *--cp) && cp >= name) continue;

            *++cp = 0;
            /* readpos points to the first character of the field body. */
            *++cp = 0;
            /* readpos points to the first character of the field body. */

-           /* fall through */
+           /* FALLTHRU */

 
        case FLDPLUS: {
            /*
 
        case FLDPLUS: {
            /*


@@ -565,12 +698,23 @@ m_getfld (m_getfld_state_t s, unsigned char name[NAMESZ], unsigned char *buf,
            n = 0;
            for (finished = 0; ! finished; ) {
                while (c != '\n'  &&  c != EOF  &&  n++ < max) {
            n = 0;
            for (finished = 0; ! finished; ) {
                while (c != '\n'  &&  c != EOF  &&  n++ < max) {

-                   *cp++ = c = Getc (s);
+                   if ((c = Getc (s)) != EOF)
+                        *cp++ = c;

                }
 
                }
 

-               if (c != EOF) c = Peek (s);
+               if (c != EOF)
+                    c = Peek (s);

                if (max < n) {
                if (max < n) {

-                   /* the dest buffer is full */
+                   /* The dest buffer is full.  Need to back the read
+                      pointer up by one because when m_getfld() is
+                      reentered, it will read a character.  Then
+                      we'll jump right to the FLDPLUS handling code,
+                      which will not store that character, but
+                      instead move on to the next one. */
+                   if (s->readpos > s->msg_buf) {
+                       --s->readpos;
+                       --s->bytes_read;
+                   }

                    s->state = FLDPLUS;
                    finished = 1;
                } else if (c != ' '  &&  c != '\t') {
                    s->state = FLDPLUS;
                    finished = 1;
                } else if (c != ' '  &&  c != '\t') {


@@ -594,12 +738,13 @@ m_getfld (m_getfld_state_t s, unsigned char name[NAMESZ], unsigned char *buf,
             * get the message body up to bufsz characters or the
             * end of the message.
             */
             * get the message body up to bufsz characters or the
             * end of the message.
             */

-           unsigned char *bp;
+           char *bp;

 
 

+            name[0] = '\0';

            max = *bufsz-1;
            max = *bufsz-1;

-           /* Back up and store the current position and update cnt. */
+           /* Back up and store the current position. */

            bp = --s->readpos;
            bp = --s->readpos;

-           c = s->end - s->readpos < max  ?  s->end - s->readpos  :  max;
+            c = min(s->end - s->readpos, max);

            if (s->msg_style != MS_DEFAULT && c > 1) {
                /*
                 * packed maildrop - only take up to the (possible)
            if (s->msg_style != MS_DEFAULT && c > 1) {
                /*
                 * packed maildrop - only take up to the (possible)


@@ -613,9 +758,12 @@ m_getfld (m_getfld_state_t s, unsigned char name[NAMESZ], unsigned char *buf,
                 * algorithms vs. brute force.)  Since I (currently)
                 * run MH on a vax, we use the matchc instruction. --vj
                 */
                 * algorithms vs. brute force.)  Since I (currently)
                 * run MH on a vax, we use the matchc instruction. --vj
                 */

-               unsigned char *ep;
+               char *ep;

 
 

-               if ((ep = matchc( s->fdelimlen, s->fdelim, c, bp )))
+                if ((ep = memmem(bp, c, s->fdelim, s->fdelimlen)))
+                    /* Plus one to nab the '\n' that starts fdelim as
+                     * that ends the previous line;  it isn't part of
+                     * msg_delim. */

                    c = ep - bp + 1;
                else {
                    /*
                    c = ep - bp + 1;
                else {
                    /*


@@ -631,10 +779,10 @@ m_getfld (m_getfld_state_t s, unsigned char name[NAMESZ], unsigned char *buf,
                     * ends with one of the characters in the pattern
                     * (excluding the first and last), we do only one test.
                     */
                     * ends with one of the characters in the pattern
                     * (excluding the first and last), we do only one test.
                     */

-                   unsigned char *sp;
+                   char *sp;

 
 

-                   ep = bp + c - 1;
-                   if ((sp = s->pat_map[*ep])) {
+                    ep = bp + c - 1; /* The last byte. */
+                   if ((sp = s->pat_map[(unsigned char) *ep])) {

                        do {
                            /* This if() is true unless (a) the buffer is too
                             * small to contain this delimiter prefix, or
                        do {
                            /* This if() is true unless (a) the buffer is too
                             * small to contain this delimiter prefix, or


@@ -695,19 +843,32 @@ m_getfld (m_getfld_state_t s, unsigned char name[NAMESZ], unsigned char *buf,
 }
 
 
 }
 
 

+/* m_getfld() with the existing iob. */
+int m_getfld2(m_getfld_state_t *gstate, char name[NAMESZ], char *buf, int *bufsz)
+{
+    if (!*gstate)
+       adios(NULL, "m_getfld2 without gstate");
+
+    return m_getfld(gstate, name, buf, bufsz, (*gstate)->iob);
+}
+
+

 void
 void

-m_unknown(m_getfld_state_t s, FILE *iob)
+m_unknown(m_getfld_state_t *gstate, FILE *iob)

 {
 {

-    register int c;
+    m_getfld_state_t s;
+    int c;

     char text[MAX_DELIMITER_SIZE];
     char text[MAX_DELIMITER_SIZE];

-    register char *cp;
-    register char *delimstr;
+    char from[] = "From ";
+    char *cp;
+    char *delimstr;

     unsigned int i;
 
     unsigned int i;
 

-    enter_getfld (s, iob);
+    enter_getfld (gstate, iob);
+    s = *gstate;

 
 /*
 
 /*

- * Figure out what the message delimitter string is for this
+ * Figure out what the message delimiter string is for this

  * maildrop.  (This used to be part of m_Eom but I didn't like
  * the idea of an "if" statement that could only succeed on the
  * first call to m_Eom getting executed on each call, i.e., at
  * maildrop.  (This used to be part of m_Eom but I didn't like
  * the idea of an "if" statement that could only succeed on the
  * first call to m_Eom getting executed on each call, i.e., at


@@ -722,75 +883,73 @@ m_unknown(m_getfld_state_t s, FILE *iob)
     s->msg_style = MS_UNKNOWN;
 
     for (i = 0, cp = text; i < sizeof text; ++i, ++cp) {
     s->msg_style = MS_UNKNOWN;
 
     for (i = 0, cp = text; i < sizeof text; ++i, ++cp) {

-       if ((*cp = Getc (s)) == EOF) {
+       if ((c = Getc (s)) == EOF) {
+           *cp = '\0';

            break;
        }
            break;
        }

+        *cp = c;

     }
 
     }
 

-    if (i == sizeof text  &&  strncmp (text, "From ", sizeof text) == 0) {
+    if (i == sizeof from-1  &&  strncmp (text, "From ", sizeof from-1) == 0) {

        s->msg_style = MS_MBOX;
        delimstr = "\nFrom ";
        s->msg_style = MS_MBOX;
        delimstr = "\nFrom ";

-       while ((c = Getc (s)) != '\n' && c >= 0) continue;
-       /* m_unknown is only called on maildrop files, and they are only
-          read using m_getfld ().  The caller musn't try to read from
-          the stream directly because the file position indicator was
-          not advanced based on bytes_read, but instead on whatever
-          was read into the message buffer. */
+       while ((c = Getc(s)) != EOF && c != '\n')
+            ;

     } else {
        /* not a Unix style maildrop */
        s->readpos -= s->bytes_read;
     } else {
        /* not a Unix style maildrop */
        s->readpos -= s->bytes_read;

-       delimstr = mmdlm2;
+       s->bytes_read = 0;
+       delimstr = MMDF_DELIM;

        s->msg_style = MS_MMDF;
     }
        s->msg_style = MS_MMDF;
     }

+
+    /*     "\nFrom \0"   7                  "\001\001\001\001\n\0"  6
+     *       |                                  |
+     *       delimstr   c=6                     delimstr   c=5
+     */

     c = strlen (delimstr);
     c = strlen (delimstr);

-    s->fdelim = (unsigned char *) mh_xmalloc((size_t) (c + 3));
+    s->fdelim = mh_xmalloc (c + 3); /* \0, \n, delimstr, \0 */

     *s->fdelim++ = '\0';
     *s->fdelim = '\n';
     *s->fdelim++ = '\0';
     *s->fdelim = '\n';

-    s->msg_delim = (char *)s->fdelim+1;
-    s->edelim = (unsigned char *)s->msg_delim+1;

     s->fdelimlen = c + 1;
     s->fdelimlen = c + 1;

-    s->edelimlen = c - 1; /* == strlen (delimstr) */
+    s->msg_delim = s->fdelim+1;

     strcpy (s->msg_delim, delimstr);
     strcpy (s->msg_delim, delimstr);

-    s->delimend = (unsigned char *)s->msg_delim + s->edelimlen;
+    s->edelim = s->msg_delim+1;
+    s->edelimlen = c - 1;
+    s->delimend = s->msg_delim + s->edelimlen;

     if (s->edelimlen <= 1)
        adios (NULL, "maildrop delimiter must be at least 2 bytes");
     if (s->edelimlen <= 1)
        adios (NULL, "maildrop delimiter must be at least 2 bytes");

+

     /*
      * build a Boyer-Moore end-position map for the matcher in m_getfld.
      * N.B. - we don't match just the first char (since it's the newline
      * separator) or the last char (since the matchc would have found it
      * if it was a real delim).
      */
     /*
      * build a Boyer-Moore end-position map for the matcher in m_getfld.
      * N.B. - we don't match just the first char (since it's the newline
      * separator) or the last char (since the matchc would have found it
      * if it was a real delim).
      */

-    s->pat_map = (unsigned char **) calloc (256, sizeof(unsigned char *));
+    s->pat_map = (char **) mh_xcalloc (256, sizeof(char *));

 
 

-    for (cp = (char *) s->fdelim + 1; cp < (char *) s->delimend; cp++ )
-       s->pat_map[(unsigned char)*cp] = (unsigned char *) cp;
+    for (cp = s->fdelim + 1; cp < s->delimend; cp++ )
+       s->pat_map[(unsigned char)*cp] = cp;

 
     if (s->msg_style == MS_MMDF) {
        /* flush extra msg hdrs */
 
     if (s->msg_style == MS_MMDF) {
        /* flush extra msg hdrs */

-       while ((c = Getc(s)) >= 0 && eom (c, s))
+       while ((c = Getc(s)) != EOF && eom (c, s))

            ;
            ;

-       if (c >= 0)
-           Ungetc(c, s);
+       if (c != EOF)
+            Ungetc(s);

     }
 
     leave_getfld (s);
 }
 
 
     }
 
     leave_getfld (s);
 }
 
 

-void
-m_eomsbr (m_getfld_state_t s, int (*action)(int))
+/* m_unknown() with the existing iob. */
+void m_unknown2(m_getfld_state_t *gstate)

 {
 {

-    if ((s->eom_action = action)) {
-       s->msg_style = MS_MSH;
-       *s->msg_delim = 0;
-       s->fdelimlen = 1;
-       s->delimend = s->fdelim;
-    } else {
-       s->msg_style = MS_MMDF;
-       s->msg_delim = (char *)s->fdelim + 1;
-       s->fdelimlen = strlen((char *)s->fdelim);
-       s->delimend = (unsigned char *)(s->msg_delim + s->edelimlen);
-    }
+    if (!*gstate)
+       adios(NULL, "m_unknown2 without gstate");
+
+    m_unknown(gstate, (*gstate)->iob);

 }
 
 
 }
 
 


@@ -799,62 +958,53 @@ m_eomsbr (m_getfld_state_t s, int (*action)(int))
  */
 
 static int
  */
 
 static int

-m_Eom (m_getfld_state_t s, int c)
+m_Eom (m_getfld_state_t s)

 {
 {

-    register int i;
+    int i;

     char text[MAX_DELIMITER_SIZE];
     char *cp;
     char text[MAX_DELIMITER_SIZE];
     char *cp;

+    int adjust = 1;

 
     for (i = 0, cp = text; i < s->edelimlen; ++i, ++cp) {
 
     for (i = 0, cp = text; i < s->edelimlen; ++i, ++cp) {

-       if ((*cp = Getc (s)) == EOF) {
+       int c2;
+
+       if ((c2 = Getc (s)) == EOF) {
+           *cp = '\0';

            break;
        }
            break;
        }

+       *cp = c2;

     }
 
     if (i != s->edelimlen  ||
         strncmp (text, (char *)s->edelim, s->edelimlen)) {
     }
 
     if (i != s->edelimlen  ||
         strncmp (text, (char *)s->edelim, s->edelimlen)) {

-       if (i == 0 && s->msg_style == MS_MBOX)
+       if (i == 0 && s->msg_style == MS_MBOX) {

            /* the final newline in the (brain damaged) unix-format
            /* the final newline in the (brain damaged) unix-format

-            * maildrop is part of the delimitter - delete it.
+            * maildrop is part of the delimiter - delete it.

             */
            return 1;
             */
            return 1;

+       }
+
+       if (i <= 2  &&  s->msg_style == MS_MBOX  &&
+           i != s->edelimlen  &&  ! strncmp(text, s->fdelim, i)) {
+           /* If all or part of fdelim appeared at the end of the file,
+              back up even more so that the bytes are included in the
+              message. */
+           adjust = 2;
+       }

 
        /* Did not find delimiter, so restore the read position.
           Note that on input, a character had already been read
           with Getc().  It will be unget by m_getfld () on return. */
 
        /* Did not find delimiter, so restore the read position.
           Note that on input, a character had already been read
           with Getc().  It will be unget by m_getfld () on return. */

-       s->readpos -= s->bytes_read - 1;
+       s->readpos -= s->bytes_read - adjust;
+       s->bytes_read = adjust;

        return 0;
     }
 
     if (s->msg_style == MS_MBOX) {
        return 0;
     }
 
     if (s->msg_style == MS_MBOX) {

-       while ((c = Getc (s)) != '\n')
-           if (c < 0)
-               break;
+       int c;
+       while ((c = Getc(s)) != EOF && c != '\n')
+            ;

     }
 
     return 1;
 }
     }
 
     return 1;
 }

-
-
-static unsigned char *
-matchc(int patln, char *pat, int strln, char *str)
-{
-       register char *es = str + strln - patln;
-       register char *sp;
-       register char *pp;
-       register char *ep = pat + patln;
-       register char pc = *pat++;
-
-       for(;;) {
-               while (pc != *str++)
-                       if (str > es)
-                               return 0;
-               if (str > es+1)
-                       return 0;
-               sp = str; pp = pat;
-               while (pp < ep && *sp++ == *pp)
-                       pp++;
-               if (pp >= ep)
-                       return ((unsigned char *)--str);
-       }
-}