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) 1997-2009 Free Software Foundation, Inc.
   5
   6    This file is part of the GNU Readline Library (Readline), a library
   7    for reading lines of text with interactive input and history editing.
   8
   9    Readline is free software: you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation, either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    Readline is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with Readline.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  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 #if defined (HAVE_LIMITS_H)
  48 #  include <limits.h>
  49 #endif
  50
  51 #if defined (HAVE_FCNTL_H)
  52 #include <fcntl.h>
  53 #endif
  54 #if defined (HAVE_PWD_H)
  55 #include <pwd.h>
  56 #endif
  57
  58 #include <stdio.h>
  59
  60 #include "rlstdc.h"
  61 #include "rlshell.h"
  62 #include "rldefs.h"
  63
  64 #include "xmalloc.h"
  65
  66 #if defined (HAVE_GETPWUID) && !defined (HAVE_GETPW_DECLS)
  67 extern struct passwd *getpwuid PARAMS((uid_t));
  68 #endif /* HAVE_GETPWUID && !HAVE_GETPW_DECLS */
  69
  70 #ifndef NULL
  71 #  define NULL 0
  72 #endif
  73
  74 #ifndef CHAR_BIT
  75 #  define CHAR_BIT 8
  76 #endif
  77
  78 /* Nonzero if the integer type T is signed.  */
  79 #define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
  80
  81 /* Bound on length of the string representing an integer value of type T.
  82    Subtract one for the sign bit if T is signed;
  83    302 / 1000 is log10 (2) rounded up;
  84    add one for integer division truncation;
  85    add one more for a minus sign if t is signed.  */
  86 #define INT_STRLEN_BOUND(t) \
  87   ((sizeof (t) * CHAR_BIT - TYPE_SIGNED (t)) * 302 / 1000 \
  88    + 1 + TYPE_SIGNED (t))
  89
  90 /* All of these functions are resolved from bash if we are linking readline
  91    as part of bash. */
  92
  93 /* Does shell-like quoting using single quotes. */
  94 char *
  95 sh_single_quote (string)
  96      char *string;
  97 {
  98   register int c;
  99   char *result, *r, *s;
 100
 101   result = (char *)xmalloc (3 + (4 * strlen (string)));
 102   r = result;
 103   *r++ = '\'';
 104
 105   for (s = string; s && (c = *s); s++)
 106     {
 107       *r++ = c;
 108
 109       if (c == '\'')
 110         {
 111           *r++ = '\\';  /* insert escaped single quote */
 112           *r++ = '\'';
 113           *r++ = '\'';  /* start new quoted string */
 114         }
 115     }
 116
 117   *r++ = '\'';
 118   *r = '\0';
 119
 120   return (result);
 121 }
 122
 123 /* Set the environment variables LINES and COLUMNS to lines and cols,
 124    respectively. */
 125 static char setenv_buf[INT_STRLEN_BOUND (int) + 1];
 126 static char putenv_buf1[INT_STRLEN_BOUND (int) + 6 + 1];        /* sizeof("LINES=") == 6 */
 127 static char putenv_buf2[INT_STRLEN_BOUND (int) + 8 + 1];        /* sizeof("COLUMNS=") == 8 */
 128
 129 void
 130 sh_set_lines_and_columns (lines, cols)
 131      int lines, cols;
 132 {
 133 #if defined (HAVE_SETENV)
 134   sprintf (setenv_buf, "%d", lines);
 135   setenv ("LINES", setenv_buf, 1);
 136
 137   sprintf (setenv_buf, "%d", cols);
 138   setenv ("COLUMNS", setenv_buf, 1);
 139 #else /* !HAVE_SETENV */
 140 #  if defined (HAVE_PUTENV)
 141   sprintf (putenv_buf1, "LINES=%d", lines);
 142   putenv (putenv_buf1);
 143
 144   sprintf (putenv_buf2, "COLUMNS=%d", cols);
 145   putenv (putenv_buf2);
 146 #  endif /* HAVE_PUTENV */
 147 #endif /* !HAVE_SETENV */
 148 }
 149
 150 char *
 151 sh_get_env_value (varname)
 152      const char *varname;
 153 {
 154   return ((char *)getenv (varname));
 155 }
 156
 157 char *
 158 sh_get_home_dir ()
 159 {
 160   static char *home_dir = (char *)NULL;
 161   struct passwd *entry;
 162
 163   if (home_dir)
 164     return (home_dir);
 165
 166   home_dir = (char *)NULL;
 167 #if defined (HAVE_GETPWUID)
 168 #  if defined (__TANDEM)
 169   entry = getpwnam (getlogin ());
 170 #  else
 171   entry = getpwuid (getuid ());
 172 #  endif
 173   if (entry)
 174     home_dir = savestring (entry->pw_dir);
 175 #endif
 176
 177 #if defined (HAVE_GETPWENT)
 178   endpwent ();          /* some systems need this */
 179 #endif
 180
 181   return (home_dir);
 182 }
 183
 184 #if !defined (O_NDELAY)
 185 #  if defined (FNDELAY)
 186 #    define O_NDELAY FNDELAY
 187 #  endif
 188 #endif
 189
 190 int
 191 sh_unset_nodelay_mode (fd)
 192      int fd;
 193 {
 194 #if defined (HAVE_FCNTL)
 195   int flags, bflags;
 196
 197   if ((flags = fcntl (fd, F_GETFL, 0)) < 0)
 198     return -1;
 199
 200   bflags = 0;
 201
 202 #ifdef O_NONBLOCK
 203   bflags |= O_NONBLOCK;
 204 #endif
 205
 206 #ifdef O_NDELAY
 207   bflags |= O_NDELAY;
 208 #endif
 209
 210   if (flags & bflags)
 211     {
 212       flags &= ~bflags;
 213       return (fcntl (fd, F_SETFL, flags));
 214     }
 215 #endif
 216
 217   return 0;
 218 }