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 #if defined (HAVE_LIMITS_H)
  48 #  include <limits.h>
  49 #endif
  50
  51 #include <fcntl.h>
  52 #include <pwd.h>
  53
  54 #include <stdio.h>
  55
  56 #include "rlstdc.h"
  57 #include "rlshell.h"
  58 #include "xmalloc.h"
  59
  60 #if !defined (HAVE_GETPW_DECLS)
  61 extern struct passwd *getpwuid PARAMS((uid_t));
  62 #endif /* !HAVE_GETPW_DECLS */
  63
  64 #ifndef NULL
  65 #  define NULL 0
  66 #endif
  67
  68 #ifndef CHAR_BIT
  69 #  define CHAR_BIT 8
  70 #endif
  71
  72 /* Nonzero if the integer type T is signed.  */
  73 #define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
  74
  75 /* Bound on length of the string representing an integer value of type T.
  76    Subtract one for the sign bit if T is signed;
  77    302 / 1000 is log10 (2) rounded up;
  78    add one for integer division truncation;
  79    add one more for a minus sign if t is signed.  */
  80 #define INT_STRLEN_BOUND(t) \
  81   ((sizeof (t) * CHAR_BIT - TYPE_SIGNED (t)) * 302 / 1000 \
  82    + 1 + TYPE_SIGNED (t))
  83
  84 /* All of these functions are resolved from bash if we are linking readline
  85    as part of bash. */
  86
  87 /* Does shell-like quoting using single quotes. */
  88 char *
  89 sh_single_quote (string)
  90      char *string;
  91 {
  92   register int c;
  93   char *result, *r, *s;
  94
  95   result = (char *)xmalloc (3 + (4 * strlen (string)));
  96   r = result;
  97   *r++ = '\'';
  98
  99   for (s = string; s && (c = *s); s++)
 100     {
 101       *r++ = c;
 102
 103       if (c == '\'')
 104         {
 105           *r++ = '\\';  /* insert escaped single quote */
 106           *r++ = '\'';
 107           *r++ = '\'';  /* start new quoted string */
 108         }
 109     }
 110
 111   *r++ = '\'';
 112   *r = '\0';
 113
 114   return (result);
 115 }
 116
 117 /* Set the environment variables LINES and COLUMNS to lines and cols,
 118    respectively. */
 119 void
 120 sh_set_lines_and_columns (lines, cols)
 121      int lines, cols;
 122 {
 123   char *b;
 124
 125 #if defined (HAVE_PUTENV)
 126   b = (char *)xmalloc (INT_STRLEN_BOUND (int) + sizeof ("LINES=") + 1);
 127   sprintf (b, "LINES=%d", lines);
 128   putenv (b);
 129   b = (char *)xmalloc (INT_STRLEN_BOUND (int) + sizeof ("COLUMNS=") + 1);
 130   sprintf (b, "COLUMNS=%d", cols);
 131   putenv (b);
 132 #else /* !HAVE_PUTENV */
 133 #  if defined (HAVE_SETENV)
 134   b = (char *)xmalloc (INT_STRLEN_BOUND (int) + 1);
 135   sprintf (b, "%d", lines);
 136   setenv ("LINES", b, 1);
 137   b = (char *)xmalloc (INT_STRLEN_BOUND (int) + 1);
 138   sprintf (b, "%d", cols);
 139   setenv ("COLUMNS", b, 1);
 140 #  endif /* HAVE_SETENV */
 141 #endif /* !HAVE_PUTENV */
 142 }
 143
 144 char *
 145 sh_get_env_value (varname)
 146      const char *varname;
 147 {
 148   return ((char *)getenv (varname));
 149 }
 150
 151 char *
 152 sh_get_home_dir ()
 153 {
 154   char *home_dir;
 155   struct passwd *entry;
 156
 157   home_dir = (char *)NULL;
 158   entry = getpwuid (getuid ());
 159   if (entry)
 160     home_dir = entry->pw_dir;
 161   return (home_dir);
 162 }
 163
 164 #if !defined (O_NDELAY)
 165 #  if defined (FNDELAY)
 166 #    define O_NDELAY FNDELAY
 167 #  endif
 168 #endif
 169
 170 int
 171 sh_unset_nodelay_mode (fd)
 172      int fd;
 173 {
 174   int flags, bflags;
 175
 176   if ((flags = fcntl (fd, F_GETFL, 0)) < 0)
 177     return -1;
 178
 179   bflags = 0;
 180
 181 #ifdef O_NONBLOCK
 182   bflags |= O_NONBLOCK;
 183 #endif
 184
 185 #ifdef O_NDELAY
 186   bflags |= O_NDELAY;
 187 #endif
 188
 189   if (flags & bflags)
 190     {
 191       flags &= ~bflags;
 192       return (fcntl (fd, F_SETFL, flags));
 193     }
 194
 195   return 0;
 196 }