wiretap: Convert ascend.y to Lemon.

Convert wiretap/ascend.y.in from Bison/YACC to Lemon and rename it to
wiretap/ascend_parser.lemon. Tighten up some of our scanning and
parsing. Make the indentation in it and related files consistent. Aside
from the recent IPv4 fragment offset changes, this produces identical
output to the 3.4 branch for the Ascend trace files I have here.

Remove the comment about supporting other commands. Another timeline
might have an Ascend that successfully pivoted to DSL or 15625B+1D
gigabit ISDN, but this one has neither.

This was our last/only Bison/YACC file, so remove Bison/YACC as a
development and packaging dependency and remove references to it from
the documentation.

1 files changed, 345 insertions, 347 deletions

diff --git a/wiretap/ascendtext.c b/wiretap/ascendtext.c
index 47ec6e182c..5a24215572 100644
--- a/wiretap/ascendtext.c
+++ b/wiretap/ascendtext.c
@@ -23,46 +23,54 @@
 /* Last updated: Feb 03 2005: Josh Bailey (joshbailey@lucent.com).
 
    This module reads the text hex dump output of various TAOS
-   (Lucent/Ascend Max, Max TNT, APX, etc) debug commands, including:
+   (Avaya/Alcatel/Lucent/Ascend Max, Max TNT, APX, etc) debug commands, including:
 
    * pridisplay         traces primary rate ISDN
    * ether-display      traces Ethernet packets (dangerous! CPU intensive)
    * wanopening, wandisplay, wannext, wandsess
                         traces PPP or other WAN connections
 
-   Please see ascend.y for examples.
+   Please see ascend_parser.lemon for examples.
 
    Detailed documentation on TAOS products was at http://support.lucent.com;
    that no longer works, and appears not to be available on the Wayback
    Machine.
 
-   Some online manuals include:
+   Some online manuals and other information include:
 
    MAX Administration Guide:
        https://downloads.avaya.com/elmodocs2/definity/def_r10_new/max/0678_002.pdf
 
-   Support for other commands will be added on an ongoing basis. */
+   Other MAX documentation:
+       https://support.avaya.com/products/P1192/max
+       https://web.archive.org/web/20201127014004/https://support.avaya.com/products/P1192/max#Tab4
+
+   Ascend Router Information:
+       http://maxrouter.rde.net/
+       https://web.archive.org/web/20200807215418/http://maxrouter.rde.net/
+
+ */
 
 typedef struct _ascend_magic_string {
-  guint        type;
-  const gchar *strptr;
-  size_t       strlength;
+    guint        type;
+    const gchar *strptr;
+    size_t       strlength;
 } ascend_magic_string;
 
 /* these magic strings signify the headers of a supported debug commands */
 #define ASCEND_MAGIC_ENTRY(type, string) \
-  { type, string, sizeof string - 1 } /* strlen of a constant string */
+    { type, string, sizeof string - 1 } /* strlen of a constant string */
 static const ascend_magic_string ascend_magic[] = {
-  ASCEND_MAGIC_ENTRY(ASCEND_PFX_ISDN_X,  "PRI-XMIT-"),
-  ASCEND_MAGIC_ENTRY(ASCEND_PFX_ISDN_R,  "PRI-RCV-"),
-  ASCEND_MAGIC_ENTRY(ASCEND_PFX_WDS_X,   "XMIT-"),
-  ASCEND_MAGIC_ENTRY(ASCEND_PFX_WDS_R,   "RECV-"),
-  ASCEND_MAGIC_ENTRY(ASCEND_PFX_WDS_X,   "XMIT:"),
-  ASCEND_MAGIC_ENTRY(ASCEND_PFX_WDS_R,   "RECV:"),
-  ASCEND_MAGIC_ENTRY(ASCEND_PFX_WDS_X,   "PPP-OUT"),
-  ASCEND_MAGIC_ENTRY(ASCEND_PFX_WDS_R,   "PPP-IN"),
-  ASCEND_MAGIC_ENTRY(ASCEND_PFX_WDD,     "WD_DIALOUT_DISP:"),
-  ASCEND_MAGIC_ENTRY(ASCEND_PFX_ETHER,   "ETHER"),
+    ASCEND_MAGIC_ENTRY(ASCEND_PFX_ISDN_X,  "PRI-XMIT-"),
+    ASCEND_MAGIC_ENTRY(ASCEND_PFX_ISDN_R,  "PRI-RCV-"),
+    ASCEND_MAGIC_ENTRY(ASCEND_PFX_WDS_X,   "XMIT-"),
+    ASCEND_MAGIC_ENTRY(ASCEND_PFX_WDS_R,   "RECV-"),
+    ASCEND_MAGIC_ENTRY(ASCEND_PFX_WDS_X,   "XMIT:"),
+    ASCEND_MAGIC_ENTRY(ASCEND_PFX_WDS_R,   "RECV:"),
+    ASCEND_MAGIC_ENTRY(ASCEND_PFX_WDS_X,   "PPP-OUT"),
+    ASCEND_MAGIC_ENTRY(ASCEND_PFX_WDS_R,   "PPP-IN"),
+    ASCEND_MAGIC_ENTRY(ASCEND_PFX_WDD,     "WD_DIALOUT_DISP:"),
+    ASCEND_MAGIC_ENTRY(ASCEND_PFX_ETHER,   "ETHER"),
 };
 
 #define ASCEND_MAGIC_STRINGS    G_N_ELEMENTS(ascend_magic)
@@ -80,213 +88,214 @@ static gboolean ascend_seek_read(wtap *wth, gint64 seek_off,
    Returns -1 on failure. */
 static gint64 ascend_find_next_packet(wtap *wth, int *err, gchar **err_info)
 {
-  int byte;
-  gint64 date_off = -1, cur_off, packet_off;
-  size_t string_level[ASCEND_MAGIC_STRINGS];
-  guint string_i = 0;
-  static const gchar ascend_date[] = ASCEND_DATE;
-  size_t ascend_date_len           = sizeof ascend_date - 1; /* strlen of a constant string */
-  size_t ascend_date_string_level;
-  guint excessive_read_count = 262144;
-
-  memset(&string_level, 0, sizeof(string_level));
-  ascend_date_string_level = 0;
-
-  while (((byte = file_getc(wth->fh)) != EOF)) {
-    excessive_read_count--;
-
-    if (!excessive_read_count) {
-      *err = 0;
-      return -1;
-    }
+    int byte;
+    gint64 date_off = -1, cur_off, packet_off;
+    size_t string_level[ASCEND_MAGIC_STRINGS];
+    guint string_i = 0;
+    static const gchar ascend_date[] = ASCEND_DATE;
+    size_t ascend_date_len           = sizeof ascend_date - 1; /* strlen of a constant string */
+    size_t ascend_date_string_level;
+    guint excessive_read_count = 262144;
+
+    memset(&string_level, 0, sizeof(string_level));
+    ascend_date_string_level = 0;
+
+    while (((byte = file_getc(wth->fh)) != EOF)) {
+        excessive_read_count--;
+
+        if (!excessive_read_count) {
+        *err = 0;
+        return -1;
+        }
 
-    /*
-     * See whether this is the string_level[string_i]th character of
-     * Ascend magic string string_i.
-     */
-    for (string_i = 0; string_i < ASCEND_MAGIC_STRINGS; string_i++) {
-      const gchar *strptr = ascend_magic[string_i].strptr;
-      size_t len          = ascend_magic[string_i].strlength;
-
-      if (byte == *(strptr + string_level[string_i])) {
         /*
-         * Yes, it is, so we need to check for the next character of
-         * that string.
-         */
-        string_level[string_i]++;
+        * See whether this is the string_level[string_i]th character of
+        * Ascend magic string string_i.
+        */
+        for (string_i = 0; string_i < ASCEND_MAGIC_STRINGS; string_i++) {
+        const gchar *strptr = ascend_magic[string_i].strptr;
+        size_t len          = ascend_magic[string_i].strlength;
+
+        if (byte == *(strptr + string_level[string_i])) {
+            /*
+            * Yes, it is, so we need to check for the next character of
+            * that string.
+            */
+            string_level[string_i]++;
+
+            /*
+            * Have we matched the entire string?
+            */
+            if (string_level[string_i] >= len) {
+            /*
+            * Yes.
+            */
+            cur_off = file_tell(wth->fh);
+            if (cur_off == -1) {
+                /* Error. */
+                *err = file_error(wth->fh, err_info);
+                return -1;
+            }
+
+            /* We matched some other type of header. */
+            if (date_off == -1) {
+                /* We haven't yet seen a date header, so this packet
+                doesn't have one.
+                Back up over the header we just read; that's where a read
+                of this packet should start. */
+                packet_off = cur_off - len;
+            } else {
+                /* This packet has a date/time header; a read of it should
+                start at the beginning of *that* header. */
+                packet_off = date_off;
+            }
+
+            goto found;
+            }
+        } else {
+            /*
+            * Not a match for this string, so reset the match process.
+            */
+            string_level[string_i] = 0;
+        }
+        }
 
         /*
-         * Have we matched the entire string?
-         */
-        if (string_level[string_i] >= len) {
-          /*
-           * Yes.
-           */
-          cur_off = file_tell(wth->fh);
-          if (cur_off == -1) {
+        * See whether this is the date_string_level'th character of
+        * ASCEND_DATE.
+        */
+        if (byte == *(ascend_date + ascend_date_string_level)) {
+        /*
+        * Yes, it is, so we need to check for the next character of
+        * that string.
+        */
+        ascend_date_string_level++;
+
+        /*
+        * Have we matched the entire string?
+        */
+        if (ascend_date_string_level >= ascend_date_len) {
+            /* We matched a Date: header.  It's a special case;
+            remember the offset, but keep looking for other
+            headers.
+
+            Reset the amount of Date: header that we've matched,
+            so that we start the process of matching a Date:
+            header all over again.
+
+            XXX - what if we match multiple Date: headers before
+            matching some other header? */
+            cur_off = file_tell(wth->fh);
+            if (cur_off == -1) {
             /* Error. */
             *err = file_error(wth->fh, err_info);
             return -1;
-          }
-
-          /* We matched some other type of header. */
-          if (date_off == -1) {
-            /* We haven't yet seen a date header, so this packet
-               doesn't have one.
-               Back up over the header we just read; that's where a read
-               of this packet should start. */
-            packet_off = cur_off - len;
-          } else {
-            /* This packet has a date/time header; a read of it should
-               start at the beginning of *that* header. */
-            packet_off = date_off;
-          }
-
-          goto found;
-        }
-      } else {
-        /*
-         * Not a match for this string, so reset the match process.
-         */
-        string_level[string_i] = 0;
-      }
-    }
+            }
 
-    /*
-     * See whether this is the date_string_level'th character of
-     * ASCEND_DATE.
-     */
-    if (byte == *(ascend_date + ascend_date_string_level)) {
-      /*
-       * Yes, it is, so we need to check for the next character of
-       * that string.
-       */
-      ascend_date_string_level++;
-
-      /*
-       * Have we matched the entire string?
-       */
-      if (ascend_date_string_level >= ascend_date_len) {
-        /* We matched a Date: header.  It's a special case;
-           remember the offset, but keep looking for other
-           headers.
-
-           Reset the amount of Date: header that we've matched,
-           so that we start the process of matching a Date:
-           header all over again.
-
-           XXX - what if we match multiple Date: headers before
-           matching some other header? */
-        cur_off = file_tell(wth->fh);
-        if (cur_off == -1) {
-          /* Error. */
-          *err = file_error(wth->fh, err_info);
-          return -1;
+            date_off = cur_off - ascend_date_len;
+            ascend_date_string_level = 0;
         }
-
-        date_off = cur_off - ascend_date_len;
+        } else {
+        /*
+        * Not a match for the Date: string, so reset the match process.
+        */
         ascend_date_string_level = 0;
-      }
-    } else {
-      /*
-       * Not a match for the Date: string, so reset the match process.
-       */
-      ascend_date_string_level = 0;
+        }
     }
-  }
 
-  *err = file_error(wth->fh, err_info);
-  return -1;
+    *err = file_error(wth->fh, err_info);
+    return -1;
 
 found:
-  /*
-   * Move to where the read for this packet should start, and return
-   * that seek offset.
-   */
-  if (file_seek(wth->fh, packet_off, SEEK_SET, err) == -1)
-    return -1;
+    /*
+    * Move to where the read for this packet should start, and return
+    * that seek offset.
+    */
+    if (file_seek(wth->fh, packet_off, SEEK_SET, err) == -1)
+        return -1;
 
-  return packet_off;
+    return packet_off;
 }
 
 wtap_open_return_val ascend_open(wtap *wth, int *err, gchar **err_info)
 {
-  gint64 offset;
-  guint8 buf[ASCEND_MAX_PKT_LEN];
-  ascend_state_t parser_state;
-  ws_statb64 statbuf;
-  ascend_t *ascend;
-  wtap_rec rec;
-
-  /* We haven't yet allocated a data structure for our private stuff;
-     set the pointer to null, so that "ascend_find_next_packet()" knows
-     not to fill it in. */
-  wth->priv = NULL;
-
-  offset = ascend_find_next_packet(wth, err, err_info);
-  if (offset == -1) {
-    if (*err != 0 && *err != WTAP_ERR_SHORT_READ)
-      return WTAP_OPEN_ERROR;  /* read error */
-    return WTAP_OPEN_NOT_MINE; /* EOF */
-  }
-
-  /* Do a trial parse of the first packet just found to see if we might
-     really have an Ascend file.  If it fails with an actual error,
-     fail; those will be I/O errors. */
-  if (run_ascend_parser(wth->fh, &rec, buf, &parser_state, err,
-                        err_info) != 0 && *err != 0) {
-      /* An I/O error. */
-      return WTAP_OPEN_ERROR;
-  }
-
-  /* Either the parse succeeded, or it failed but didn't get an I/O
-     error.
-
-     If we got at least some data, return success even if the parser
-     reported an error. This is because the debug header gives the
-     number of bytes on the wire, not actually how many bytes are in
-     the trace.  We won't know where the data ends until we run into
-     the next packet. */
-  if (parser_state.caplen == 0) {
-    /* We read no data, so this presumably isn't an Ascend file. */
-    return WTAP_OPEN_NOT_MINE;
-  }
-
-  wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_ASCEND;
-  wth->file_encap = WTAP_ENCAP_ASCEND;
-
-  wth->snapshot_length = ASCEND_MAX_PKT_LEN;
-  wth->subtype_read = ascend_read;
-  wth->subtype_seek_read = ascend_seek_read;
-  ascend = (ascend_t *)g_malloc(sizeof(ascend_t));
-  wth->priv = (void *)ascend;
-
-  /* The first packet we want to read is the one that
-     "ascend_find_next_packet()" just found; start searching
-     for it at the offset at which it found it. */
-  ascend->next_packet_seek_start = offset;
-
-  /* MAXen and Pipelines report the time since reboot.  In order to keep
-     from reporting packet times near the epoch, we subtract the first
-     packet's timestamp from the capture file's ctime, which gives us an
-     offset that we can apply to each packet.
-   */
-  if (wtap_fstat(wth, &statbuf, err) == -1) {
-    return WTAP_OPEN_ERROR;
-  }
-  ascend->inittime = statbuf.st_ctime;
-  ascend->adjusted = FALSE;
-  wth->file_tsprec = WTAP_TSPREC_USEC;
-
-  /*
-   * Add an IDB; we don't know how many interfaces were
-   * involved, so we just say one interface, about which
-   * we only know the link-layer type, snapshot length,
-   * and time stamp resolution.
-   */
-  wtap_add_generated_idb(wth);
-
-  return WTAP_OPEN_MINE;
+    gint64 offset;
+    guint8 buf[ASCEND_MAX_PKT_LEN];
+    ascend_state_t parser_state = {0};
+    ws_statb64 statbuf;
+    ascend_t *ascend;
+    wtap_rec rec;
+
+    /* We haven't yet allocated a data structure for our private stuff;
+        set the pointer to null, so that "ascend_find_next_packet()" knows
+        not to fill it in. */
+    wth->priv = NULL;
+
+    offset = ascend_find_next_packet(wth, err, err_info);
+    if (offset == -1) {
+        if (*err != 0 && *err != WTAP_ERR_SHORT_READ)
+        return WTAP_OPEN_ERROR;  /* read error */
+        return WTAP_OPEN_NOT_MINE; /* EOF */
+    }
+
+    /* Do a trial parse of the first packet just found to see if we might
+        really have an Ascend file.  If it fails with an actual error,
+        fail; those will be I/O errors. */
+    parser_state.fh = wth->fh;
+    parser_state.pseudo_header = &rec.rec_header.packet_header.pseudo_header.ascend;
+    if (run_ascend_parser(buf, &parser_state, err, err_info) != 0 && *err != 0) {
+        /* An I/O error. */
+        return WTAP_OPEN_ERROR;
+    }
+
+    /* Either the parse succeeded, or it failed but didn't get an I/O
+        error.
+
+        If we got at least some data, return success even if the parser
+        reported an error. This is because the debug header gives the
+        number of bytes on the wire, not actually how many bytes are in
+        the trace.  We won't know where the data ends until we run into
+        the next packet. */
+    if (parser_state.caplen == 0) {
+        /* We read no data, so this presumably isn't an Ascend file. */
+        return WTAP_OPEN_NOT_MINE;
+    }
+
+    wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_ASCEND;
+    wth->file_encap = WTAP_ENCAP_ASCEND;
+
+    wth->snapshot_length = ASCEND_MAX_PKT_LEN;
+    wth->subtype_read = ascend_read;
+    wth->subtype_seek_read = ascend_seek_read;
+    ascend = (ascend_t *)g_malloc(sizeof(ascend_t));
+    wth->priv = (void *)ascend;
+
+    /* The first packet we want to read is the one that
+        "ascend_find_next_packet()" just found; start searching
+        for it at the offset at which it found it. */
+    ascend->next_packet_seek_start = offset;
+
+    /* MAXen and Pipelines report the time since reboot.  In order to keep
+        from reporting packet times near the epoch, we subtract the first
+        packet's timestamp from the capture file's ctime, which gives us an
+        offset that we can apply to each packet.
+    */
+    if (wtap_fstat(wth, &statbuf, err) == -1) {
+        return WTAP_OPEN_ERROR;
+    }
+    ascend->inittime = statbuf.st_ctime;
+    ascend->adjusted = FALSE;
+    wth->file_tsprec = WTAP_TSPREC_USEC;
+
+    /*
+    * Add an IDB; we don't know how many interfaces were
+    * involved, so we just say one interface, about which
+    * we only know the link-layer type, snapshot length,
+    * and time stamp resolution.
+    */
+    wtap_add_generated_idb(wth);
+
+    return WTAP_OPEN_MINE;
 }
 
 /* Parse the capture file.
@@ -296,161 +305,150 @@ parse_ascend(ascend_t *ascend, FILE_T fh, wtap_rec *rec, Buffer *buf,
              guint length, gint64 *next_packet_seek_start_ret,
              int *err, gchar **err_info)
 {
-  ascend_state_t parser_state;
-  int retval;
-
-  ws_buffer_assure_space(buf, length);
-  retval = run_ascend_parser(fh, rec, ws_buffer_start_ptr(buf), &parser_state,
-                             err, err_info);
-
-  /* Did we see any data (hex bytes)? */
-  if (parser_state.first_hexbyte) {
-    /* Yes.  Provide the offset of the first byte so that our caller can
-       tip off ascend_find_next_packet() as to where to look for the next
-       packet, if any. */
-    if (next_packet_seek_start_ret != NULL)
-      *next_packet_seek_start_ret = parser_state.first_hexbyte;
-  } else {
-    /* No.  Maybe this record was broken; sometimes, a header will be
-       printed but the data will be omitted, or worse -- two headers will
-       be printed, followed by the data for each.
-
-       Because of this, we need to be fairly tolerant of what we accept
-       here.  Provide our current offset so that our caller can tell
-       ascend_find_next_packet() to skip over what we've read so far so
-       we can try reading a new packet.
-
-     . That keeps us from getting into an infinite loop reading a broken
-       trace. */
-    if (next_packet_seek_start_ret != NULL)
-      *next_packet_seek_start_ret = file_tell(fh);
-
-    /* Don't treat that as a fatal error; pretend the parse succeeded. */
-    retval = 0;
-  }
-
-  /* if we got at least some data, return success even if the parser
-     reported an error. This is because the debug header gives the number
-     of bytes on the wire, not actually how many bytes are in the trace.
-     We won't know where the data ends until we run into the next packet. */
-  if (parser_state.caplen) {
-    if (! ascend->adjusted) {
-      ascend->adjusted = TRUE;
-      if (parser_state.saw_timestamp) {
-        /*
-         * Capture file contained a date and time.
-         * We do this only if this is the very first packet we've seen -
-         * i.e., if "ascend->adjusted" is false - because
-         * if we get a date and time after the first packet, we can't
-         * go back and adjust the time stamps of the packets we've already
-         * processed, and basing the time stamps of this and following
-         * packets on the time stamp from the file text rather than the
-         * ctime of the capture file means times before this and after
-         * this can't be compared.
-         */
-        ascend->inittime = parser_state.timestamp;
-      }
-      if (ascend->inittime > parser_state.secs)
-        ascend->inittime -= parser_state.secs;
+    ascend_state_t parser_state = {0};
+    int retval;
+
+    ws_buffer_assure_space(buf, length);
+    parser_state.fh = fh;
+    parser_state.pseudo_header = &rec->rec_header.packet_header.pseudo_header.ascend;
+
+    retval = run_ascend_parser(ws_buffer_start_ptr(buf), &parser_state, err, err_info);
+
+    /* Did we see any data (hex bytes)? */
+    if (parser_state.first_hexbyte) {
+        /* Yes.  Provide the offset of the first byte so that our caller can
+        tip off ascend_find_next_packet() as to where to look for the next
+        packet, if any. */
+        if (next_packet_seek_start_ret != NULL)
+        *next_packet_seek_start_ret = parser_state.first_hexbyte;
+    } else {
+        /* No.  Maybe this record was broken; sometimes, a header will be
+        printed but the data will be omitted, or worse -- two headers will
+        be printed, followed by the data for each.
+
+        Because of this, we need to be fairly tolerant of what we accept
+        here.  Provide our current offset so that our caller can tell
+        ascend_find_next_packet() to skip over what we've read so far so
+        we can try reading a new packet.
+
+        . That keeps us from getting into an infinite loop reading a broken
+        trace. */
+        if (next_packet_seek_start_ret != NULL)
+        *next_packet_seek_start_ret = file_tell(fh);
+
+        /* Don't treat that as a fatal error; pretend the parse succeeded. */
+        retval = 0;
     }
-    rec->presence_flags = WTAP_HAS_TS|WTAP_HAS_CAP_LEN;
-    rec->ts.secs = parser_state.secs + ascend->inittime;
-    rec->ts.nsecs = parser_state.usecs * 1000;
-    rec->rec_header.packet_header.caplen = parser_state.caplen;
-    rec->rec_header.packet_header.len = parser_state.wirelen;
 
-    return TRUE;
-  }
-
-  /* Didn't see any data. Still, perhaps the parser was happy.  */
-  if (retval) {
-    if (*err == 0) {
-      /* Parser failed, but didn't report an I/O error, so a parse error.
-         Return WTAP_ERR_BAD_FILE, with the parse error as the error string. */
-      *err = WTAP_ERR_BAD_FILE;
-      *err_info = g_strdup((parser_state.ascend_parse_error != NULL) ? parser_state.ascend_parse_error : "parse error");
+    /* if we got at least some data, return success even if the parser
+        reported an error. This is because the debug header gives the number
+        of bytes on the wire, not actually how many bytes are in the trace.
+        We won't know where the data ends until we run into the next packet. */
+    if (parser_state.caplen) {
+        if (! ascend->adjusted) {
+        ascend->adjusted = TRUE;
+        if (parser_state.saw_timestamp) {
+            /*
+            * Capture file contained a date and time.
+            * We do this only if this is the very first packet we've seen -
+            * i.e., if "ascend->adjusted" is false - because
+            * if we get a date and time after the first packet, we can't
+            * go back and adjust the time stamps of the packets we've already
+            * processed, and basing the time stamps of this and following
+            * packets on the time stamp from the file text rather than the
+            * ctime of the capture file means times before this and after
+            * this can't be compared.
+            */
+            ascend->inittime = parser_state.timestamp;
+        }
+        if (ascend->inittime > parser_state.secs)
+            ascend->inittime -= parser_state.secs;
+        }
+        rec->presence_flags = WTAP_HAS_TS|WTAP_HAS_CAP_LEN;
+        rec->ts.secs = parser_state.secs + ascend->inittime;
+        rec->ts.nsecs = parser_state.usecs * 1000;
+        rec->rec_header.packet_header.caplen = parser_state.caplen;
+        rec->rec_header.packet_header.len = parser_state.wirelen;
+
+        return TRUE;
     }
-  } else {
-    if (*err == 0) {
-      /* Parser succeeded, but got no data, and didn't report an I/O error.
-         Return WTAP_ERR_BAD_FILE, with a "got no data" error string. */
-      *err = WTAP_ERR_BAD_FILE;
-      *err_info = g_strdup("no data returned by parse");
+
+    /* Didn't see any data. Still, perhaps the parser was happy.  */
+    if (retval) {
+        if (*err == 0) {
+        /* Parser failed, but didn't report an I/O error, so a parse error.
+            Return WTAP_ERR_BAD_FILE, with the parse error as the error string. */
+        *err = WTAP_ERR_BAD_FILE;
+        *err_info = g_strdup((parser_state.ascend_parse_error != NULL) ? parser_state.ascend_parse_error : "parse error");
+        }
+    } else {
+        if (*err == 0) {
+        /* Parser succeeded, but got no data, and didn't report an I/O error.
+            Return WTAP_ERR_BAD_FILE, with a "got no data" error string. */
+        *err = WTAP_ERR_BAD_FILE;
+        *err_info = g_strdup("no data returned by parse");
+        }
     }
-  }
-  return FALSE;
+    return FALSE;
 }
 
 /* Read the next packet; called from wtap_read(). */
 static gboolean ascend_read(wtap *wth, wtap_rec *rec, Buffer *buf, int *err,
 	gchar **err_info, gint64 *data_offset)
 {
-  ascend_t *ascend = (ascend_t *)wth->priv;
-  gint64 offset;
-
-  /* parse_ascend() will advance the point at which to look for the next
-     packet's header, to just after the last packet's header (ie. at the
-     start of the last packet's data). We have to get past the last
-     packet's header because we might mistake part of it for a new header. */
-  if (file_seek(wth->fh, ascend->next_packet_seek_start,
-                SEEK_SET, err) == -1)
-    return FALSE;
-
-  offset = ascend_find_next_packet(wth, err, err_info);
-  if (offset == -1) {
-    /* EOF or read error */
-    return FALSE;
-  }
-  if (!parse_ascend(ascend, wth->fh, rec, buf, wth->snapshot_length,
-                    &ascend->next_packet_seek_start, err, err_info))
-    return FALSE;
-
-  /* Flex might have gotten an EOF and caused *err to be set to
-     WTAP_ERR_SHORT_READ.  If so, that's not an error, as the parser
-     didn't return an error; set *err to 0, and get rid of any error
-     string. */
-  *err = 0;
-  if (*err_info != NULL) {
-      g_free(*err_info);
-      *err_info = NULL;
-  }
-  *data_offset = offset;
-  return TRUE;
+    ascend_t *ascend = (ascend_t *)wth->priv;
+    gint64 offset;
+
+    /* parse_ascend() will advance the point at which to look for the next
+        packet's header, to just after the last packet's header (ie. at the
+        start of the last packet's data). We have to get past the last
+        packet's header because we might mistake part of it for a new header. */
+    if (file_seek(wth->fh, ascend->next_packet_seek_start,
+                    SEEK_SET, err) == -1)
+        return FALSE;
+
+    offset = ascend_find_next_packet(wth, err, err_info);
+    if (offset == -1) {
+        /* EOF or read error */
+        return FALSE;
+    }
+    if (!parse_ascend(ascend, wth->fh, rec, buf, wth->snapshot_length,
+                        &ascend->next_packet_seek_start, err, err_info))
+        return FALSE;
+
+    /* Flex might have gotten an EOF and caused *err to be set to
+        WTAP_ERR_SHORT_READ.  If so, that's not an error, as the parser
+        didn't return an error; set *err to 0, and get rid of any error
+        string. */
+    *err = 0;
+    if (*err_info != NULL) {
+        g_free(*err_info);
+        *err_info = NULL;
+    }
+    *data_offset = offset;
+    return TRUE;
 }
 
 static gboolean ascend_seek_read(wtap *wth, gint64 seek_off,
         wtap_rec *rec, Buffer *buf,
         int *err, gchar **err_info)
 {
-  ascend_t *ascend = (ascend_t *)wth->priv;
-
-  if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
-    return FALSE;
-  if (!parse_ascend(ascend, wth->random_fh, rec, buf,
-                   wth->snapshot_length, NULL, err, err_info))
-    return FALSE;
-
-  /* Flex might have gotten an EOF and caused *err to be set to
-     WTAP_ERR_SHORT_READ.  If so, that's not an error, as the parser
-     didn't return an error; set *err to 0, and get rid of any error
-     string. */
-  *err = 0;
-  if (*err_info != NULL) {
-      g_free(*err_info);
-      *err_info = NULL;
-  }
-  return TRUE;
+    ascend_t *ascend = (ascend_t *)wth->priv;
+
+    if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
+        return FALSE;
+    if (!parse_ascend(ascend, wth->random_fh, rec, buf,
+                    wth->snapshot_length, NULL, err, err_info))
+        return FALSE;
+
+    /* Flex might have gotten an EOF and caused *err to be set to
+        WTAP_ERR_SHORT_READ.  If so, that's not an error, as the parser
+        didn't return an error; set *err to 0, and get rid of any error
+        string. */
+    *err = 0;
+    if (*err_info != NULL) {
+        g_free(*err_info);
+        *err_info = NULL;
+    }
+    return TRUE;
 }
-
-/*
- * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
- *
- * Local Variables:
- * c-basic-offset: 2
- * tab-width: 8
- * indent-tabs-mode: nil
- * End:
- *
- * vi: set shiftwidth=2 tabstop=8 expandtab:
- * :indentSize=2:tabSize=8:noTabs=true:
- */