Initial revision

1 files changed, 751 insertions, 0 deletions

diff --git a/src/termcap.c b/src/termcap.c
new file mode 100644
index 00000000000..6261a1fb16e
--- /dev/null
+++ b/src/termcap.c
@@ -0,0 +1,751 @@
+/* Work-alike for termcap, plus extra features.
+   Copyright (C) 1985, 1986, 1993, 1994 Free Software Foundation, Inc.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+/* Emacs config.h may rename various library functions such as malloc.  */
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#else /* not HAVE_CONFIG_H */
+
+#if defined(HAVE_STRING_H) || defined(STDC_HEADERS)
+#define bcopy(s, d, n) memcpy ((d), (s), (n))
+#endif
+
+#ifdef STDC_HEADERS
+#include <stdlib.h>
+#include <string.h>
+#else
+char *getenv ();
+char *malloc ();
+char *realloc ();
+#endif
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#ifdef _POSIX_VERSION
+#include <fcntl.h>
+#endif
+
+#endif /* not HAVE_CONFIG_H */
+
+#ifndef NULL
+#define NULL (char *) 0
+#endif
+
+/* BUFSIZE is the initial size allocated for the buffer
+   for reading the termcap file.
+   It is not a limit.
+   Make it large normally for speed.
+   Make it variable when debugging, so can exercise
+   increasing the space dynamically.  */
+
+#ifndef BUFSIZE
+#ifdef DEBUG
+#define BUFSIZE bufsize
+
+int bufsize = 128;
+#else
+#define BUFSIZE 2048
+#endif
+#endif
+
+#ifndef TERMCAP_NAME
+#define TERMCAP_NAME "/etc/termcap"
+#endif
+
+#ifndef emacs
+static void
+memory_out ()
+{
+  write (2, "virtual memory exhausted\n", 25);
+  exit (1);
+}
+
+static char *
+xmalloc (size)
+     unsigned size;
+{
+  register char *tem = malloc (size);
+
+  if (!tem)
+    memory_out ();
+  return tem;
+}
+
+static char *
+xrealloc (ptr, size)
+     char *ptr;
+     unsigned size;
+{
+  register char *tem = realloc (ptr, size);
+
+  if (!tem)
+    memory_out ();
+  return tem;
+}
+#endif /* not emacs */
+
+/* Looking up capabilities in the entry already found.  */
+
+/* The pointer to the data made by tgetent is left here
+   for tgetnum, tgetflag and tgetstr to find.  */
+static char *term_entry;
+
+static char *tgetst1 ();
+
+/* Search entry BP for capability CAP.
+   Return a pointer to the capability (in BP) if found,
+   0 if not found.  */
+
+static char *
+find_capability (bp, cap)
+     register char *bp, *cap;
+{
+  for (; *bp; bp++)
+    if (bp[0] == ':'
+        && bp[1] == cap[0]
+        && bp[2] == cap[1])
+      return &bp[4];
+  return NULL;
+}
+
+int
+tgetnum (cap)
+     char *cap;
+{
+  register char *ptr = find_capability (term_entry, cap);
+  if (!ptr || ptr[-1] != '#')
+    return -1;
+  return atoi (ptr);
+}
+
+int
+tgetflag (cap)
+     char *cap;
+{
+  register char *ptr = find_capability (term_entry, cap);
+  return ptr && ptr[-1] == ':';
+}
+
+/* Look up a string-valued capability CAP.
+   If AREA is non-null, it points to a pointer to a block in which
+   to store the string.  That pointer is advanced over the space used.
+   If AREA is null, space is allocated with `malloc'.  */
+
+char *
+tgetstr (cap, area)
+     char *cap;
+     char **area;
+{
+  register char *ptr = find_capability (term_entry, cap);
+  if (!ptr || (ptr[-1] != '=' && ptr[-1] != '~'))
+    return NULL;
+  return tgetst1 (ptr, area);
+}
+
+/* Table, indexed by a character in range 0100 to 0140 with 0100 subtracted,
+   gives meaning of character following \, or a space if no special meaning.
+   Eight characters per line within the string.  */
+
+static char esctab[]
+  = " \007\010  \033\014 \
+      \012 \
+  \015 \011 \013 \
+        ";
+
+/* PTR points to a string value inside a termcap entry.
+   Copy that value, processing \ and ^ abbreviations,
+   into the block that *AREA points to,
+   or to newly allocated storage if AREA is NULL.
+   Return the address to which we copied the value,
+   or NULL if PTR is NULL.  */
+
+static char *
+tgetst1 (ptr, area)
+     char *ptr;
+     char **area;
+{
+  register char *p, *r;
+  register int c;
+  register int size;
+  char *ret;
+  register int c1;
+
+  if (!ptr)
+    return NULL;
+
+  /* `ret' gets address of where to store the string.  */
+  if (!area)
+    {
+      /* Compute size of block needed (may overestimate).  */
+      p = ptr;
+      while ((c = *p++) && c != ':' && c != '\n')
+        ;
+      ret = (char *) xmalloc (p - ptr + 1);
+    }
+  else
+    ret = *area;
+
+  /* Copy the string value, stopping at null or colon.
+     Also process ^ and \ abbreviations.  */
+  p = ptr;
+  r = ret;
+  while ((c = *p++) && c != ':' && c != '\n')
+    {
+      if (c == '^')
+        c = *p++ & 037;
+      else if (c == '\\')
+        {
+          c = *p++;
+          if (c >= '0' && c <= '7')
+            {
+              c -= '0';
+              size = 0;
+
+              while (++size < 3 && (c1 = *p) >= '0' && c1 <= '7')
+                {
+                  c *= 8;
+                  c += c1 - '0';
+                  p++;
+                }
+            }
+          else if (c >= 0100 && c < 0200)
+            {
+              c1 = esctab[(c & ~040) - 0100];
+              if (c1 != ' ')
+                c = c1;
+            }
+        }
+      *r++ = c;
+    }
+  *r = '\0';
+  /* Update *AREA.  */
+  if (area)
+    *area = r + 1;
+  return ret;
+}
+
+/* Outputting a string with padding.  */
+
+short ospeed;
+/* If OSPEED is 0, we use this as the actual baud rate.  */
+int tputs_baud_rate;
+char PC;
+
+/* Actual baud rate if positive;
+   - baud rate / 100 if negative.  */
+
+static short speeds[] =
+  {
+#ifdef VMS
+    0, 50, 75, 110, 134, 150, -3, -6, -12, -18,
+    -20, -24, -36, -48, -72, -96, -192
+#else /* not VMS */
+    0, 50, 75, 110, 135, 150, -2, -3, -6, -12,
+    -18, -24, -48, -96, -192, -384
+#endif /* not VMS */
+  };
+
+void
+tputs (str, nlines, outfun)
+     register char *str;
+     int nlines;
+     register int (*outfun) ();
+{
+  register int padcount = 0;
+  register int speed;
+
+#ifdef emacs
+  extern baud_rate;
+  speed = baud_rate;
+#else
+  if (ospeed == 0)
+    speed = tputs_baud_rate;
+  else
+    speed = speeds[ospeed];
+#endif
+
+  if (!str)
+    return;
+
+  while (*str >= '0' && *str <= '9')
+    {
+      padcount += *str++ - '0';
+      padcount *= 10;
+    }
+  if (*str == '.')
+    {
+      str++;
+      padcount += *str++ - '0';
+    }
+  if (*str == '*')
+    {
+      str++;
+      padcount *= nlines;
+    }
+  while (*str)
+    (*outfun) (*str++);
+
+  /* padcount is now in units of tenths of msec.  */
+  padcount *= speeds[ospeed];
+  padcount += 500;
+  padcount /= 1000;
+  if (speeds[ospeed] < 0)
+    padcount = -padcount;
+  else
+    {
+      padcount += 50;
+      padcount /= 100;
+    }
+
+  while (padcount-- > 0)
+    (*outfun) (PC);
+}
+
+/* Finding the termcap entry in the termcap data base.  */
+
+struct buffer
+  {
+    char *beg;
+    int size;
+    char *ptr;
+    int ateof;
+    int full;
+  };
+
+/* Forward declarations of static functions.  */
+
+static int scan_file ();
+static char *gobble_line ();
+static int compare_contin ();
+static int name_match ();
+
+#ifdef VMS
+
+#include <rmsdef.h>
+#include <fab.h>
+#include <nam.h>
+
+static int
+valid_filename_p (fn)
+     char *fn;
+{
+  struct FAB fab = cc$rms_fab;
+  struct NAM nam = cc$rms_nam;
+  char esa[NAM$C_MAXRSS];
+
+  fab.fab$l_fna = fn;
+  fab.fab$b_fns = strlen(fn);
+  fab.fab$l_nam = &nam;
+  fab.fab$l_fop = FAB$M_NAM;
+
+  nam.nam$l_esa = esa;
+  nam.nam$b_ess = sizeof esa;
+
+  return SYS$PARSE(&fab, 0, 0) == RMS$_NORMAL;
+}
+
+#else /* !VMS */
+
+#ifdef MSDOS /* MW, May 1993 */
+static int
+valid_filename_p (fn)
+     char *fn;
+{
+  return *fn == '/' || fn[1] == ':';
+}
+#else
+#define valid_filename_p(fn) (*(fn) == '/')
+#endif
+
+#endif /* !VMS */
+
+/* Find the termcap entry data for terminal type NAME
+   and store it in the block that BP points to.
+   Record its address for future use.
+
+   If BP is null, space is dynamically allocated.
+
+   Return -1 if there is some difficulty accessing the data base
+   of terminal types,
+   0 if the data base is accessible but the type NAME is not defined
+   in it, and some other value otherwise.  */
+
+int
+tgetent (bp, name)
+     char *bp, *name;
+{
+  register char *termcap_name;
+  register int fd;
+  struct buffer buf;
+  register char *bp1;
+  char *bp2;
+  char *term;
+  int malloc_size = 0;
+  register int c;
+  char *tcenv;                  /* TERMCAP value, if it contains :tc=.  */
+  char *indirect = NULL;        /* Terminal type in :tc= in TERMCAP value.  */
+  int filep;
+
+#ifdef INTERNAL_TERMINAL
+  /* For the internal terminal we don't want to read any termcap file,
+     so fake it.  */
+  if (!strcmp (name, "internal"))
+    {
+      term = INTERNAL_TERMINAL;
+      if (!bp)
+        {
+          malloc_size = 1 + strlen (term);
+          bp = (char *) xmalloc (malloc_size);
+        }
+      strcpy (bp, term);
+      goto ret;
+    }
+#endif /* INTERNAL_TERMINAL */
+
+  termcap_name = getenv ("TERMCAP");
+  if (termcap_name && *termcap_name == '\0')
+    termcap_name = NULL;
+#if defined (MSDOS) && !defined (TEST)
+  if (termcap_name && (*termcap_name == '\\'
+                       || *termcap_name == '/'
+                       || termcap_name[1] == ':'))
+    dostounix_filename(termcap_name);
+#endif
+
+  filep = termcap_name && valid_filename_p (termcap_name);
+
+  /* If termcap_name is non-null and starts with / (in the un*x case, that is),
+     it is a file name to use instead of /etc/termcap.
+     If it is non-null and does not start with /,
+     it is the entry itself, but only if
+     the name the caller requested matches the TERM variable.  */
+
+  if (termcap_name && !filep && !strcmp (name, getenv ("TERM")))
+    {
+      indirect = tgetst1 (find_capability (termcap_name, "tc"), (char **) 0);
+      if (!indirect)
+        {
+          if (!bp)
+            bp = termcap_name;
+          else
+            strcpy (bp, termcap_name);
+          goto ret;
+        }
+      else
+        {                       /* It has tc=.  Need to read /etc/termcap.  */
+          tcenv = termcap_name;
+          termcap_name = NULL;
+        }
+    }
+
+  if (!termcap_name || !filep)
+    termcap_name = TERMCAP_NAME;
+
+  /* Here we know we must search a file and termcap_name has its name.  */
+
+#ifdef MSDOS
+  fd = open (termcap_name, O_TEXT, 0);
+#else
+  fd = open (termcap_name, 0, 0);
+#endif
+  if (fd < 0)
+    return -1;
+
+  buf.size = BUFSIZE;
+  /* Add 1 to size to ensure room for terminating null.  */
+  buf.beg = (char *) xmalloc (buf.size + 1);
+  term = indirect ? indirect : name;
+
+  if (!bp)
+    {
+      malloc_size = indirect ? strlen (tcenv) + 1 : buf.size;
+      bp = (char *) xmalloc (malloc_size);
+    }
+  bp1 = bp;
+
+  if (indirect)
+    /* Copy the data from the environment variable.  */
+    {
+      strcpy (bp, tcenv);
+      bp1 += strlen (tcenv);
+    }
+
+  while (term)
+    {
+      /* Scan the file, reading it via buf, till find start of main entry.  */
+      if (scan_file (term, fd, &buf) == 0)
+        {
+          close (fd);
+          free (buf.beg);
+          if (malloc_size)
+            free (bp);
+          return 0;
+        }
+
+      /* Free old `term' if appropriate.  */
+      if (term != name)
+        free (term);
+
+      /* If BP is malloc'd by us, make sure it is big enough.  */
+      if (malloc_size)
+        {
+          malloc_size = bp1 - bp + buf.size;
+          termcap_name = (char *) xrealloc (bp, malloc_size);
+          bp1 += termcap_name - bp;
+          bp = termcap_name;
+        }
+
+      bp2 = bp1;
+
+      /* Copy the line of the entry from buf into bp.  */
+      termcap_name = buf.ptr;
+      while ((*bp1++ = c = *termcap_name++) && c != '\n')
+        /* Drop out any \ newline sequence.  */
+        if (c == '\\' && *termcap_name == '\n')
+          {
+            bp1--;
+            termcap_name++;
+          }
+      *bp1 = '\0';
+
+      /* Does this entry refer to another terminal type's entry?
+         If something is found, copy it into heap and null-terminate it.  */
+      term = tgetst1 (find_capability (bp2, "tc"), (char **) 0);
+    }
+
+  close (fd);
+  free (buf.beg);
+
+  if (malloc_size)
+    bp = (char *) xrealloc (bp, bp1 - bp + 1);
+
+ ret:
+  term_entry = bp;
+  if (malloc_size)
+    return (int) bp;
+  return 1;
+}
+
+/* Given file open on FD and buffer BUFP,
+   scan the file from the beginning until a line is found
+   that starts the entry for terminal type STR.
+   Return 1 if successful, with that line in BUFP,
+   or 0 if no entry is found in the file.  */
+
+static int
+scan_file (str, fd, bufp)
+     char *str;
+     int fd;
+     register struct buffer *bufp;
+{
+  register char *end;
+
+  bufp->ptr = bufp->beg;
+  bufp->full = 0;
+  bufp->ateof = 0;
+  *bufp->ptr = '\0';
+
+  lseek (fd, 0L, 0);
+
+  while (!bufp->ateof)
+    {
+      /* Read a line into the buffer.  */
+      end = NULL;
+      do
+        {
+          /* if it is continued, append another line to it,
+             until a non-continued line ends.  */
+          end = gobble_line (fd, bufp, end);
+        }
+      while (!bufp->ateof && end[-2] == '\\');
+
+      if (*bufp->ptr != '#'
+          && name_match (bufp->ptr, str))
+        return 1;
+
+      /* Discard the line just processed.  */
+      bufp->ptr = end;
+    }
+  return 0;
+}
+
+/* Return nonzero if NAME is one of the names specified
+   by termcap entry LINE.  */
+
+static int
+name_match (line, name)
+     char *line, *name;
+{
+  register char *tem;
+
+  if (!compare_contin (line, name))
+    return 1;
+  /* This line starts an entry.  Is it the right one?  */
+  for (tem = line; *tem && *tem != '\n' && *tem != ':'; tem++)
+    if (*tem == '|' && !compare_contin (tem + 1, name))
+      return 1;
+
+  return 0;
+}
+
+static int
+compare_contin (str1, str2)
+     register char *str1, *str2;
+{
+  register int c1, c2;
+  while (1)
+    {
+      c1 = *str1++;
+      c2 = *str2++;
+      while (c1 == '\\' && *str1 == '\n')
+        {
+          str1++;
+          while ((c1 = *str1++) == ' ' || c1 == '\t');
+        }
+      if (c2 == '\0')
+        {
+          /* End of type being looked up.  */
+          if (c1 == '|' || c1 == ':')
+            /* If end of name in data base, we win.  */
+            return 0;
+          else
+            return 1;
+        }
+      else if (c1 != c2)
+        return 1;
+    }
+}
+
+/* Make sure that the buffer <- BUFP contains a full line
+   of the file open on FD, starting at the place BUFP->ptr
+   points to.  Can read more of the file, discard stuff before
+   BUFP->ptr, or make the buffer bigger.
+
+   Return the pointer to after the newline ending the line,
+   or to the end of the file, if there is no newline to end it.
+
+   Can also merge on continuation lines.  If APPEND_END is
+   non-null, it points past the newline of a line that is
+   continued; we add another line onto it and regard the whole
+   thing as one line.  The caller decides when a line is continued.  */
+
+static char *
+gobble_line (fd, bufp, append_end)
+     int fd;
+     register struct buffer *bufp;
+     char *append_end;
+{
+  register char *end;
+  register int nread;
+  register char *buf = bufp->beg;
+  register char *tem;
+
+  if (!append_end)
+    append_end = bufp->ptr;
+
+  while (1)
+    {
+      end = append_end;
+      while (*end && *end != '\n') end++;
+      if (*end)
+        break;
+      if (bufp->ateof)
+        return buf + bufp->full;
+      if (bufp->ptr == buf)
+        {
+          if (bufp->full == bufp->size)
+            {
+              bufp->size *= 2;
+              /* Add 1 to size to ensure room for terminating null.  */
+              tem = (char *) xrealloc (buf, bufp->size + 1);
+              bufp->ptr = (bufp->ptr - buf) + tem;
+              append_end = (append_end - buf) + tem;
+              bufp->beg = buf = tem;
+            }
+        }
+      else
+        {
+          append_end -= bufp->ptr - buf;
+          bcopy (bufp->ptr, buf, bufp->full -= bufp->ptr - buf);
+          bufp->ptr = buf;
+        }
+      if (!(nread = read (fd, buf + bufp->full, bufp->size - bufp->full)))
+        bufp->ateof = 1;
+      bufp->full += nread;
+      buf[bufp->full] = '\0';
+    }
+  return end + 1;
+}
+
+#ifdef TEST
+
+#ifdef NULL
+#undef NULL
+#endif
+
+#include <stdio.h>
+
+main (argc, argv)
+     int argc;
+     char **argv;
+{
+  char *term;
+  char *buf;
+
+  term = argv[1];
+  printf ("TERM: %s\n", term);
+
+  buf = (char *) tgetent (0, term);
+  if ((int) buf <= 0)
+    {
+      printf ("No entry.\n");
+      return 0;
+    }
+
+  printf ("Entry: %s\n", buf);
+
+  tprint ("cm");
+  tprint ("AL");
+
+  printf ("co: %d\n", tgetnum ("co"));
+  printf ("am: %d\n", tgetflag ("am"));
+}
+
+tprint (cap)
+     char *cap;
+{
+  char *x = tgetstr (cap, 0);
+  register char *y;
+
+  printf ("%s: ", cap);
+  if (x)
+    {
+      for (y = x; *y; y++)
+        if (*y <= ' ' || *y == 0177)
+          printf ("\\%0o", *y);
+        else
+          putchar (*y);
+      free (x);
+    }
+  else
+    printf ("none");
+  putchar ('\n');
+}
+
+#endif /* TEST */
+