Escape literal leading full stop in man/new.man.

[nmh] / sbr / m_getfld.c

diff --git a/sbr/m_getfld.c b/sbr/m_getfld.c
index 902e9933138fb85221ae4b9d7a01b612c0b74875..4976b1c5faff005470361f560638a662a6bbde22 100644 (file)
--- a/sbr/m_getfld.c
+++ b/sbr/m_getfld.c
@@ -90,7 +90,7 @@
    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,
    the eom() macro returns FALSE saying we aren't at the end of the
    message.
    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
    message.


@@ -159,7 +159,7 @@
    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.


@@ -175,7 +175,7 @@
    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"


@@ -204,7 +204,6 @@
  */
 struct m_getfld_state;
 static int m_Eom (m_getfld_state_t);
  */
 struct m_getfld_state;
 static int m_Eom (m_getfld_state_t);

-static char *matchc(int, char *, int, char *);

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


@@ -228,7 +227,7 @@ struct m_getfld_state {
     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()
     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
+       calls with ftell() and fseek().  bytes_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
        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


@@ -245,10 +244,10 @@ struct m_getfld_state {
      * 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 ".
      * 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
+     * "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
      * 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
+     * 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.
      * 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.


@@ -268,7 +267,8 @@ void
 m_getfld_state_init (m_getfld_state_t *gstate, FILE *iob) {
     m_getfld_state_t s;
 
 m_getfld_state_init (m_getfld_state_t *gstate, FILE *iob) {
     m_getfld_state_t s;
 

-    s = *gstate = (m_getfld_state_t) mh_xmalloc(sizeof (struct m_getfld_state));
+    NEW(s);
+    *gstate = 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->readpos = s->end = s->msg_buf;
     s->bytes_read = s->total_bytes_read = 0;
     s->last_caller_pos = s->last_internal_pos = 0;


@@ -347,7 +347,8 @@ void m_getfld_state_destroy (m_getfld_state_t *gstate) {
 static void
 enter_getfld (m_getfld_state_t *gstate, FILE *iob) {
     m_getfld_state_t s;
 static void
 enter_getfld (m_getfld_state_t *gstate, FILE *iob) {
     m_getfld_state_t s;

-    off_t pos = ftello (iob);
+    off_t pos;
+    off_t pos_movement;

 
     if (! *gstate) {
        m_getfld_state_init (gstate, iob);
 
     if (! *gstate) {
        m_getfld_state_init (gstate, iob);


@@ -363,46 +364,51 @@ enter_getfld (m_getfld_state_t *gstate, FILE *iob) {
        readpos shift code being currently unused. */
     s->iob = iob;
 
        readpos shift code being currently unused. */
     s->iob = iob;
 

-    if (s->track_filepos  &&  (pos != 0  ||  s->last_internal_pos != 0)) {
-       if (s->last_internal_pos == 0) {
-           s->total_bytes_read = pos;
-       } else {
-           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) {
-                   /* 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 {
-                   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;

 
 

-           fseeko (iob, pos, SEEK_SET);
-       }
+    pos = ftello(iob);
+    if (pos == 0 && s->last_internal_pos == 0)
+        return;
+
+    if (s->last_internal_pos == 0) {
+        s->total_bytes_read = pos;
+        return;

     }
     }

+
+    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 {
+            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;
+        }
+    }
+
+    fseeko (iob, pos, SEEK_SET);

 }
 
 static void
 }
 
 static void


@@ -426,7 +432,8 @@ read_more (m_getfld_state_t s) {
     ssize_t retain = s->edelimlen;
     size_t num_read;
 
     ssize_t retain = s->edelimlen;
     size_t num_read;
 

-    if (retain < s->end - s->readpos) retain = s->end - s->readpos;
+    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. */
     assert (retain <= s->readpos - s->msg_buf);
 
     /* Move what we want to retain at end of the buffer to the beginning. */


@@ -444,28 +451,19 @@ read_more (m_getfld_state_t s) {
    but EOF is typically 0xffffffff. */
 static int
 Getc (m_getfld_state_t s) {
    but EOF is typically 0xffffffff. */
 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  ?  (unsigned char) *s->readpos++  :  EOF;
+    s->bytes_read++;
+    return (unsigned char)*s->readpos++;

 }
 
 static int
 Peek (m_getfld_state_t s) {
 }
 
 static int
 Peek (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) {
+        return EOF;

     }
     }

-

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


@@ -473,10 +471,9 @@ static int
 Ungetc (int c, m_getfld_state_t s) {
     if (s->readpos == s->msg_buf) {
        return EOF;
 Ungetc (int c, m_getfld_state_t s) {
     if (s->readpos == s->msg_buf) {
        return EOF;

-    } else {
-       --s->bytes_read;
-       return *--s->readpos = (unsigned char) c;

     }
     }

+    --s->bytes_read;
+    return *--s->readpos = (unsigned char) c;

 }
 
 
 }
 
 


@@ -485,23 +482,23 @@ m_getfld (m_getfld_state_t *gstate, char name[NAMESZ], char *buf, int *bufsz,
           FILE *iob)
 {
     m_getfld_state_t s;
           FILE *iob)
 {
     m_getfld_state_t s;

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

 
     enter_getfld (gstate, iob);
     s = *gstate;
 
 
     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)) {
        /* flush null messages */
        *bufsz = *buf = 0;
        leave_getfld (s);
        return s->state = FILEEOF;
     }
     if (eom (c, s)) {
        /* flush null messages */

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

            ;
 
            ;
 

-       if (c >= 0)
+       if (c != EOF)

            Ungetc(c, s);
        *bufsz = *buf = 0;
        leave_getfld (s);
            Ungetc(c, s);
        *bufsz = *buf = 0;
        leave_getfld (s);


@@ -512,13 +509,14 @@ m_getfld (m_getfld_state_t *gstate, char name[NAMESZ], char *buf, int *bufsz,
        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;
+               while (c != '\n' && (c = Getc(s)) != EOF)
+                    ;

 
 

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

                    /* flush null messages */
                    /* flush null messages */

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

                        ;
                        ;

-                   if (c >= 0)
+                   if (c != EOF)

                        Ungetc(c, s);
                    *bufsz = *buf = 0;
                    leave_getfld (s);
                        Ungetc(c, s);
                    *bufsz = *buf = 0;
                    leave_getfld (s);


@@ -583,13 +581,17 @@ m_getfld (m_getfld_state_t *gstate, char name[NAMESZ], char *buf, int *bufsz,
                memcpy (buf, name, n - 1);
                buf[n - 1] = '\n';
                buf[n] = '\0';
                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;
                /* By design, the loop above discards the last character
                    it had read.  It's in c, use it. */
                *cp++ = c;


@@ -604,7 +606,7 @@ m_getfld (m_getfld_state_t *gstate, char name[NAMESZ], char *buf, int *bufsz,
            while (isspace ((unsigned char) *--cp) && cp >= name) continue;
            *++cp = 0;
            /* readpos points to the first character of the field body. */
            while (isspace ((unsigned char) *--cp) && cp >= name) continue;
            *++cp = 0;
            /* readpos points to the first character of the field body. */

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

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


@@ -619,10 +621,12 @@ m_getfld (m_getfld_state_t *gstate, char name[NAMESZ], char *buf, int *bufsz,
            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) {

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

                }
 
                }
 

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

                if (max < n) {
                    /* The dest buffer is full.  Need to back the read
                       pointer up by one because when m_getfld() is
                if (max < n) {
                    /* The dest buffer is full.  Need to back the read
                       pointer up by one because when m_getfld() is


@@ -659,6 +663,7 @@ m_getfld (m_getfld_state_t *gstate, char name[NAMESZ], char *buf, int *bufsz,
             */
            char *bp;
 
             */
            char *bp;
 

+            name[0] = '\0';

            max = *bufsz-1;
            /* Back up and store the current position. */
            bp = --s->readpos;
            max = *bufsz-1;
            /* Back up and store the current position. */
            bp = --s->readpos;


@@ -678,7 +683,7 @@ m_getfld (m_getfld_state_t *gstate, char name[NAMESZ], char *buf, int *bufsz,
                 */
                char *ep;
 
                 */
                char *ep;
 

-               if ((ep = matchc( s->fdelimlen, s->fdelim, c, bp )))
+                if ((ep = memmem(bp, c, s->fdelim, s->fdelimlen)))

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


@@ -762,11 +767,11 @@ void
 m_unknown(m_getfld_state_t *gstate, FILE *iob)
 {
     m_getfld_state_t s;
 m_unknown(m_getfld_state_t *gstate, FILE *iob)
 {
     m_getfld_state_t s;

-    register int c;
+    int c;

     char text[MAX_DELIMITER_SIZE];
     char from[] = "From ";
     char text[MAX_DELIMITER_SIZE];
     char from[] = "From ";

-    register char *cp;
-    register char *delimstr;
+    char *cp;
+    char *delimstr;

     unsigned int i;
 
     enter_getfld (gstate, iob);
     unsigned int i;
 
     enter_getfld (gstate, iob);


@@ -799,7 +804,8 @@ m_unknown(m_getfld_state_t *gstate, FILE *iob)
     if (i == sizeof from-1  &&  strncmp (text, "From ", sizeof from-1) == 0) {
        s->msg_style = MS_MBOX;
        delimstr = "\nFrom ";
     if (i == sizeof from-1  &&  strncmp (text, "From ", sizeof from-1) == 0) {
        s->msg_style = MS_MBOX;
        delimstr = "\nFrom ";

-       while ((c = Getc (s)) != '\n' && c >= 0) continue;
+       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;


@@ -807,34 +813,48 @@ m_unknown(m_getfld_state_t *gstate, FILE *iob)
        delimstr = mmdlm2;
        s->msg_style = MS_MMDF;
     }
        delimstr = mmdlm2;
        s->msg_style = MS_MMDF;
     }

+

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

-    s->fdelim = mh_xmalloc (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 = s->fdelim+1;
-    s->edelim = 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->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");
     s->delimend = s->msg_delim + s->edelimlen;
     if (s->edelimlen <= 1)
        adios (NULL, "maildrop delimiter must be at least 2 bytes");

+
+    /* Now malloc'd memory at s->fdelim-1 referenced several times:
+     *
+     *     delimstr         "\nFrom "      "\001\001\001\001\n"
+     *     c                6              5
+     *     s->fdelim      \0"\n\nFrom "  \0"\n\001\001\001\001\n"
+     *     s->fdelimlen     6              5
+     *     s->msg_delim     "\nFrom "      "\001\001\001\001\n"
+     *     s->edelim        "From "        "\001\001\001\n"
+     *     s->edelimlen     5              4
+     *     s->delimend      " "            "\n"
+     */
+

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

 
     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 */
 
     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 */

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

            ;
            ;

-       if (c >= 0)
+       if (c != EOF)

            Ungetc(c, s);
     }
 
            Ungetc(c, s);
     }
 


@@ -849,7 +869,7 @@ m_unknown(m_getfld_state_t *gstate, FILE *iob)
 static int
 m_Eom (m_getfld_state_t s)
 {
 static int
 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;
 


@@ -882,34 +902,9 @@ m_Eom (m_getfld_state_t s)
 
     if (s->msg_style == MS_MBOX) {
        int c;
 
     if (s->msg_style == MS_MBOX) {
        int c;

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

     }
 
     return 1;
 }
     }
 
     return 1;
 }

-
-
-static 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 --str;
-       }
-}