readline/shell.c

   1 /* shell.c -- readline utility functions that are normally provided by
   2               bash when readline is linked as part of the shell. */
   3
   4 /* Copyright (C) 1997 Free Software Foundation, Inc.
   5
   6    This file is part of the GNU Readline Library, a library for
   7    reading lines of text with interactive input and history editing.
   8
   9    The GNU Readline Library is free software; you can redistribute it
  10    and/or modify it under the terms of the GNU General Public License
  11    as published by the Free Software Foundation; either version 2, or
  12    (at your option) any later version.
  13
  14    The GNU Readline Library is distributed in the hope that it will be
  15    useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  16    of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    The GNU General Public License is often shipped with GNU software, and
  20    is generally kept in a file called COPYING or LICENSE.  If you do not
  21    have a copy of the license, write to the Free Software Foundation,
  22    59 Temple Place, Suite 330, Boston, MA 02111 USA. */
  23 #define READLINE_LIBRARY
  24
  25 #if defined (HAVE_CONFIG_H)
  26 #  include <config.h>
  27 #endif
  28
  29 #include <sys/types.h>
  30 #include <stdio.h>
  31
  32 #if defined (HAVE_UNISTD_H)
  33 #  include <unistd.h>
  34 #endif /* HAVE_UNISTD_H */
  35
  36 #if defined (HAVE_STDLIB_H)
  37 #  include <stdlib.h>
  38 #else
  39 #  include "ansi_stdlib.h"
  40 #endif /* HAVE_STDLIB_H */
  41
  42 #if defined (HAVE_STRING_H)
  43 #  include <string.h>
  44 #else
  45 #  include <strings.h>
  46 #endif /* !HAVE_STRING_H */
  47
  48 #include <fcntl.h>
  49 #include <pwd.h>
  50
  51 #include <stdio.h>
  52
  53 #include "rlshell.h"
  54 #include "xmalloc.h"
  55
  56 #if !defined (HAVE_GETPW_DECLS)
  57 extern struct passwd *getpwuid ();
  58 #endif /* !HAVE_GETPW_DECLS */
  59
  60 #ifndef NULL
  61 #  define NULL 0
  62 #endif
  63
  64 /* All of these functions are resolved from bash if we are linking readline
  65    as part of bash. */
  66
  67 /* Does shell-like quoting using single quotes. */
  68 char *
  69 single_quote (string)
  70      char *string;
  71 {
  72   register int c;
  73   char *result, *r, *s;
  74
  75   result = (char *)xmalloc (3 + (4 * strlen (string)));
  76   r = result;
  77   *r++ = '\'';
  78
  79   for (s = string; s && (c = *s); s++)
  80     {
  81       *r++ = c;
  82
  83       if (c == '\'')
  84         {
  85           *r++ = '\\';  /* insert escaped single quote */
  86           *r++ = '\'';
  87           *r++ = '\'';  /* start new quoted string */
  88         }
  89     }
  90
  91   *r++ = '\'';
  92   *r = '\0';
  93
  94   return (result);
  95 }
  96
  97 /* Set the environment variables LINES and COLUMNS to lines and cols,
  98    respectively. */
  99 void
 100 set_lines_and_columns (lines, cols)
 101      int lines, cols;
 102 {
 103   char *b;
 104
 105 #if defined (HAVE_PUTENV)
 106   b = xmalloc (24);
 107   sprintf (b, "LINES=%d", lines);
 108   putenv (b);
 109   b = xmalloc (24);
 110   sprintf (b, "COLUMNS=%d", cols);
 111   putenv (b);
 112 #else /* !HAVE_PUTENV */
 113 #  if defined (HAVE_SETENV)
 114   b = xmalloc (8);
 115   sprintf (b, "%d", lines);
 116   setenv ("LINES", b, 1);
 117   b = xmalloc (8);
 118   sprintf (b, "%d", cols);
 119   setenv ("COLUMNS", b, 1);
 120 #  endif /* HAVE_SETENV */
 121 #endif /* !HAVE_PUTENV */
 122 }
 123
 124 char *
 125 get_env_value (varname)
 126      char *varname;
 127 {
 128   return ((char *)getenv (varname));
 129 }
 130
 131 char *
 132 get_home_dir ()
 133 {
 134   char *home_dir;
 135   struct passwd *entry;
 136
 137   home_dir = (char *)NULL;
 138   entry = getpwuid (getuid ());
 139   if (entry)
 140     home_dir = entry->pw_dir;
 141   return (home_dir);
 142 }
 143
 144 #if !defined (O_NDELAY)
 145 #  if defined (FNDELAY)
 146 #    define O_NDELAY FNDELAY
 147 #  endif
 148 #endif
 149
 150 int
 151 unset_nodelay_mode (fd)
 152      int fd;
 153 {
 154   int flags, bflags;
 155
 156   if ((flags = fcntl (fd, F_GETFL, 0)) < 0)
 157     return -1;
 158
 159   bflags = 0;
 160
 161 #ifdef O_NONBLOCK
 162   bflags |= O_NONBLOCK;
 163 #endif
 164
 165 #ifdef O_NDELAY
 166   bflags |= O_NDELAY;
 167 #endif
 168
 169   if (flags & bflags)
 170     {
 171       flags &= ~bflags;
 172       return (fcntl (fd, F_SETFL, flags));
 173     }
 174
 175   return 0;
 176 }