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
  31 #if defined (HAVE_UNISTD_H)
  32 #  include <unistd.h>
  33 #endif /* HAVE_UNISTD_H */
  34
  35 #if defined (HAVE_STDLIB_H)
  36 #  include <stdlib.h>
  37 #else
  38 #  include "ansi_stdlib.h"
  39 #endif /* HAVE_STDLIB_H */
  40
  41 #if defined (HAVE_STRING_H)
  42 #  include <string.h>
  43 #else
  44 #  include <strings.h>
  45 #endif /* !HAVE_STRING_H */
  46
  47 #include <fcntl.h>
  48 #include <pwd.h>
  49
  50 #include <stdio.h>
  51
  52 #include "rlshell.h"
  53 #include "xmalloc.h"
  54
  55 #if !defined (HAVE_GETPW_DECLS)
  56 extern struct passwd *getpwuid ();
  57 #endif /* !HAVE_GETPW_DECLS */
  58
  59 #ifndef NULL
  60 #  define NULL 0
  61 #endif
  62
  63 /* All of these functions are resolved from bash if we are linking readline
  64    as part of bash. */
  65
  66 /* Does shell-like quoting using single quotes. */
  67 char *
  68 single_quote (string)
  69      char *string;
  70 {
  71   register int c;
  72   char *result, *r, *s;
  73
  74   result = (char *)xmalloc (3 + (4 * strlen (string)));
  75   r = result;
  76   *r++ = '\'';
  77
  78   for (s = string; s && (c = *s); s++)
  79     {
  80       *r++ = c;
  81
  82       if (c == '\'')
  83         {
  84           *r++ = '\\';  /* insert escaped single quote */
  85           *r++ = '\'';
  86           *r++ = '\'';  /* start new quoted string */
  87         }
  88     }
  89
  90   *r++ = '\'';
  91   *r = '\0';
  92
  93   return (result);
  94 }
  95
  96 /* Set the environment variables LINES and COLUMNS to lines and cols,
  97    respectively. */
  98 void
  99 set_lines_and_columns (lines, cols)
 100      int lines, cols;
 101 {
 102   char *b;
 103
 104 #if defined (HAVE_PUTENV)
 105   b = xmalloc (24);
 106   sprintf (b, "LINES=%d", lines);
 107   putenv (b);
 108   b = xmalloc (24);
 109   sprintf (b, "COLUMNS=%d", cols);
 110   putenv (b);
 111 #else /* !HAVE_PUTENV */
 112 #  if defined (HAVE_SETENV)
 113   b = xmalloc (8);
 114   sprintf (b, "%d", lines);
 115   setenv ("LINES", b, 1);
 116   b = xmalloc (8);
 117   sprintf (b, "%d", cols);
 118   setenv ("COLUMNS", b, 1);
 119 #  endif /* HAVE_SETENV */
 120 #endif /* !HAVE_PUTENV */
 121 }
 122
 123 char *
 124 get_env_value (varname)
 125      char *varname;
 126 {
 127   return ((char *)getenv (varname));
 128 }
 129
 130 char *
 131 get_home_dir ()
 132 {
 133   char *home_dir;
 134   struct passwd *entry;
 135
 136   home_dir = (char *)NULL;
 137   entry = getpwuid (getuid ());
 138   if (entry)
 139     home_dir = entry->pw_dir;
 140   return (home_dir);
 141 }
 142
 143 #if !defined (O_NDELAY)
 144 #  if defined (FNDELAY)
 145 #    define O_NDELAY FNDELAY
 146 #  endif
 147 #endif
 148
 149 int
 150 unset_nodelay_mode (fd)
 151      int fd;
 152 {
 153   int flags, bflags;
 154
 155   if ((flags = fcntl (fd, F_GETFL, 0)) < 0)
 156     return -1;
 157
 158   bflags = 0;
 159
 160 #ifdef O_NONBLOCK
 161   bflags |= O_NONBLOCK;
 162 #endif
 163
 164 #ifdef O_NDELAY
 165   bflags |= O_NDELAY;
 166 #endif
 167
 168   if (flags & bflags)
 169     {
 170       flags &= ~bflags;
 171       return (fcntl (fd, F_SETFL, flags));
 172     }
 173
 174   return 0;
 175 }