/* tilde.c -- Tilde expansion code (~/foo := $HOME/foo). */
-/* Copyright (C) 1988,1989 Free Software Foundation, Inc.
+/* Copyright (C) 1988-2009 Free Software Foundation, Inc.
- This file is part of GNU Readline, a library for reading lines
- of text with interactive input and history editing.
+ This file is part of the GNU Readline Library (Readline), a library
+ for reading lines of text with interactive input and history editing.
- Readline 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 1, or (at your option) any
- later version.
+ Readline 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 3 of the License, or
+ (at your option) any later version.
- Readline 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.
+ Readline 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 Readline; see the file COPYING. If not, write to the Free
- Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+ along with Readline. If not, see <http://www.gnu.org/licenses/>.
+*/
#if defined (HAVE_CONFIG_H)
# include <config.h>
#endif
+#if defined (HAVE_UNISTD_H)
+# ifdef _MINIX
+# include <sys/types.h>
+# endif
+# include <unistd.h>
+#endif
+
#if defined (HAVE_STRING_H)
# include <string.h>
#else /* !HAVE_STRING_H */
#endif /* HAVE_STDLIB_H */
#include <sys/types.h>
+#if defined (HAVE_PWD_H)
#include <pwd.h>
+#endif
#include "tilde.h"
+#if defined (TEST) || defined (STATIC_MALLOC)
+static void *xmalloc (), *xrealloc ();
+#else
+# include "xmalloc.h"
+#endif /* TEST || STATIC_MALLOC */
+
#if !defined (HAVE_GETPW_DECLS)
-extern struct passwd *getpwuid (), *getpwnam ();
+# if defined (HAVE_GETPWUID)
+extern struct passwd *getpwuid PARAMS((uid_t));
+# endif
+# if defined (HAVE_GETPWNAM)
+extern struct passwd *getpwnam PARAMS((const char *));
+# endif
#endif /* !HAVE_GETPW_DECLS */
#if !defined (savestring)
-extern char *xmalloc ();
-# ifndef strcpy
-extern char *strcpy ();
-# endif
-#define savestring(x) strcpy (xmalloc (1 + strlen (x)), (x))
+#define savestring(x) strcpy ((char *)xmalloc (1 + strlen (x)), (x))
#endif /* !savestring */
#if !defined (NULL)
# endif /* !__STDC__ */
#endif /* !NULL */
-#if defined (TEST) || defined (STATIC_MALLOC)
-static char *xmalloc (), *xrealloc ();
-#else
-extern char *xmalloc (), *xrealloc ();
-#endif /* TEST || STATIC_MALLOC */
+/* If being compiled as part of bash, these will be satisfied from
+ variables.o. If being compiled as part of readline, they will
+ be satisfied from shell.o. */
+extern char *sh_get_home_dir PARAMS((void));
+extern char *sh_get_env_value PARAMS((const char *));
/* The default value of tilde_additional_prefixes. This is set to
whitespace preceding a tilde so that simple programs which do not
perform any word separation get desired behaviour. */
-static char *default_prefixes[] =
- { " ~", "\t~", (char *)NULL };
+static const char *default_prefixes[] =
+ { " ~", "\t~", (const char *)NULL };
/* The default value of tilde_additional_suffixes. This is set to
whitespace or newline so that simple programs which do not
perform any word separation get desired behaviour. */
-static char *default_suffixes[] =
- { " ", "\n", (char *)NULL };
+static const char *default_suffixes[] =
+ { " ", "\n", (const char *)NULL };
+
+/* If non-null, this contains the address of a function that the application
+ wants called before trying the standard tilde expansions. The function
+ is called with the text sans tilde, and returns a malloc()'ed string
+ which is the expansion, or a NULL pointer if the expansion fails. */
+tilde_hook_func_t *tilde_expansion_preexpansion_hook = (tilde_hook_func_t *)NULL;
/* If non-null, this contains the address of a function to call if the
standard meaning for expanding a tilde fails. The function is called
with the text (sans tilde, as in "foo"), and returns a malloc()'ed string
which is the expansion, or a NULL pointer if there is no expansion. */
-CPFunction *tilde_expansion_failure_hook = (CPFunction *)NULL;
+tilde_hook_func_t *tilde_expansion_failure_hook = (tilde_hook_func_t *)NULL;
/* When non-null, this is a NULL terminated array of strings which
are duplicates for a tilde prefix. Bash uses this to expand
`=~' and `:~'. */
-char **tilde_additional_prefixes = default_prefixes;
+char **tilde_additional_prefixes = (char **)default_prefixes;
/* When non-null, this is a NULL terminated array of strings which match
the end of a username, instead of just "/". Bash sets this to
`:' and `=~'. */
-char **tilde_additional_suffixes = default_suffixes;
+char **tilde_additional_suffixes = (char **)default_suffixes;
+
+static int tilde_find_prefix PARAMS((const char *, int *));
+static int tilde_find_suffix PARAMS((const char *));
+static char *isolate_tilde_prefix PARAMS((const char *, int *));
+static char *glue_prefix_and_suffix PARAMS((char *, const char *, int));
/* Find the start of a tilde expansion in STRING, and return the index of
the tilde which starts the expansion. Place the length of the text
which identified this tilde starter in LEN, excluding the tilde itself. */
static int
tilde_find_prefix (string, len)
- char *string;
+ const char *string;
int *len;
{
register int i, j, string_len;
- register char **prefixes = tilde_additional_prefixes;
+ register char **prefixes;
+
+ prefixes = tilde_additional_prefixes;
string_len = strlen (string);
*len = 0;
- if (!*string || *string == '~')
+ if (*string == '\0' || *string == '~')
return (0);
if (prefixes)
the character which ends the tilde definition. */
static int
tilde_find_suffix (string)
- char *string;
+ const char *string;
{
register int i, j, string_len;
- register char **suffixes = tilde_additional_suffixes;
+ register char **suffixes;
+ suffixes = tilde_additional_suffixes;
string_len = strlen (string);
for (i = 0; i < string_len; i++)
{
- if (string[i] == '/' || !string[i])
+#if defined (__MSDOS__)
+ if (string[i] == '/' || string[i] == '\\' /* || !string[i] */)
+#else
+ if (string[i] == '/' /* || !string[i] */)
+#endif
break;
for (j = 0; suffixes && suffixes[j]; j++)
/* Return a new string which is the result of tilde expanding STRING. */
char *
tilde_expand (string)
- char *string;
+ const char *string;
{
- char *result, *tilde_expand_word ();
+ char *result;
int result_size, result_index;
- result_size = result_index = 0;
- result = (char *)NULL;
+ result_index = result_size = 0;
+ if (result = strchr (string, '~'))
+ result = (char *)xmalloc (result_size = (strlen (string) + 16));
+ else
+ result = (char *)xmalloc (result_size = (strlen (string) + 1));
/* Scan through STRING expanding tildes as we come to them. */
while (1)
/* Copy the skipped text into the result. */
if ((result_index + start + 1) > result_size)
- result = xrealloc (result, 1 + (result_size += (start + 20)));
+ result = (char *)xrealloc (result, 1 + (result_size += (start + 20)));
strncpy (result + result_index, string, start);
result_index += start;
break;
/* Expand the entire tilde word, and copy it into RESULT. */
- tilde_word = xmalloc (1 + end);
+ tilde_word = (char *)xmalloc (1 + end);
strncpy (tilde_word, string, end);
tilde_word[end] = '\0';
string += end;
expansion = tilde_expand_word (tilde_word);
- free (tilde_word);
+ xfree (tilde_word);
len = strlen (expansion);
- if ((result_index + len + 1) > result_size)
- result = xrealloc (result, 1 + (result_size += (len + 20)));
+#ifdef __CYGWIN__
+ /* Fix for Cygwin to prevent ~user/xxx from expanding to //xxx when
+ $HOME for `user' is /. On cygwin, // denotes a network drive. */
+ if (len > 1 || *expansion != '/' || *string != '/')
+#endif
+ {
+ if ((result_index + len + 1) > result_size)
+ result = (char *)xrealloc (result, 1 + (result_size += (len + 20)));
- strcpy (result + result_index, expansion);
- result_index += len;
- free (expansion);
+ strcpy (result + result_index, expansion);
+ result_index += len;
+ }
+ xfree (expansion);
}
result[result_index] = '\0';
return (result);
}
+/* Take FNAME and return the tilde prefix we want expanded. If LENP is
+ non-null, the index of the end of the prefix into FNAME is returned in
+ the location it points to. */
+static char *
+isolate_tilde_prefix (fname, lenp)
+ const char *fname;
+ int *lenp;
+{
+ char *ret;
+ int i;
+
+ ret = (char *)xmalloc (strlen (fname));
+#if defined (__MSDOS__)
+ for (i = 1; fname[i] && fname[i] != '/' && fname[i] != '\\'; i++)
+#else
+ for (i = 1; fname[i] && fname[i] != '/'; i++)
+#endif
+ ret[i - 1] = fname[i];
+ ret[i - 1] = '\0';
+ if (lenp)
+ *lenp = i;
+ return ret;
+}
+
+#if 0
+/* Public function to scan a string (FNAME) beginning with a tilde and find
+ the portion of the string that should be passed to the tilde expansion
+ function. Right now, it just calls tilde_find_suffix and allocates new
+ memory, but it can be expanded to do different things later. */
+char *
+tilde_find_word (fname, flags, lenp)
+ const char *fname;
+ int flags, *lenp;
+{
+ int x;
+ char *r;
+
+ x = tilde_find_suffix (fname);
+ if (x == 0)
+ {
+ r = savestring (fname);
+ if (lenp)
+ *lenp = 0;
+ }
+ else
+ {
+ r = (char *)xmalloc (1 + x);
+ strncpy (r, fname, x);
+ r[x] = '\0';
+ if (lenp)
+ *lenp = x;
+ }
+
+ return r;
+}
+#endif
+
+/* Return a string that is PREFIX concatenated with SUFFIX starting at
+ SUFFIND. */
+static char *
+glue_prefix_and_suffix (prefix, suffix, suffind)
+ char *prefix;
+ const char *suffix;
+ int suffind;
+{
+ char *ret;
+ int plen, slen;
+
+ plen = (prefix && *prefix) ? strlen (prefix) : 0;
+ slen = strlen (suffix + suffind);
+ ret = (char *)xmalloc (plen + slen + 1);
+ if (plen)
+ strcpy (ret, prefix);
+ strcpy (ret + plen, suffix + suffind);
+ return ret;
+}
+
/* Do the work of tilde expansion on FILENAME. FILENAME starts with a
- tilde. If there is no expansion, call tilde_expansion_failure_hook. */
+ tilde. If there is no expansion, call tilde_expansion_failure_hook.
+ This always returns a newly-allocated string, never static storage. */
char *
tilde_expand_word (filename)
- char *filename;
+ const char *filename;
{
- char *dirname;
- char *temp_name;
+ char *dirname, *expansion, *username;
+ int user_len;
+ struct passwd *user_entry;
- if (filename == (char *)0)
+ if (filename == 0)
return ((char *)NULL);
- dirname = savestring (filename);
-
- if (*dirname != '~')
- return (dirname);
+ if (*filename != '~')
+ return (savestring (filename));
- if (!dirname[1] || dirname[1] == '/')
+ /* A leading `~/' or a bare `~' is *always* translated to the value of
+ $HOME or the home directory of the current user, regardless of any
+ preexpansion hook. */
+ if (filename[1] == '\0' || filename[1] == '/')
{
- /* Prepend $HOME to the rest of the string. */
- char *temp_home = (char *)getenv ("HOME");
- int home_len;
+ /* Prefix $HOME to the rest of the string. */
+ expansion = sh_get_env_value ("HOME");
/* If there is no HOME variable, look up the directory in
the password database. */
- if (!temp_home)
- {
- struct passwd *entry;
-
- entry = getpwuid (getuid ());
- if (entry)
- temp_home = entry->pw_dir;
- }
+ if (expansion == 0)
+ expansion = sh_get_home_dir ();
- home_len = temp_home ? strlen (temp_home) : 0;
- temp_name = xmalloc (1 + strlen (dirname + 1) + home_len);
-
- if (temp_home)
- strcpy (temp_name, temp_home);
- strcpy (temp_name + home_len, dirname + 1);
- free (dirname);
- dirname = temp_name;
+ return (glue_prefix_and_suffix (expansion, filename, 1));
}
- else
- {
- char *username;
- struct passwd *user_entry;
- int i, len;
- username = xmalloc (strlen (dirname));
- for (i = 1; dirname[i] && dirname[i] != '/'; i++)
- username[i - 1] = dirname[i];
- username[i - 1] = '\0';
+ username = isolate_tilde_prefix (filename, &user_len);
- if ((user_entry = getpwnam (username)) == (struct passwd *)0)
+ if (tilde_expansion_preexpansion_hook)
+ {
+ expansion = (*tilde_expansion_preexpansion_hook) (username);
+ if (expansion)
{
- /* If the calling program has a special syntax for
- expanding tildes, and we couldn't find a standard
- expansion, then let them try. */
- if (tilde_expansion_failure_hook)
- {
- char *expansion;
-
- expansion = (*tilde_expansion_failure_hook) (username);
-
- if (expansion)
- {
- len = strlen (expansion);
- temp_name = xmalloc (1 + len + strlen (dirname + i));
- strcpy (temp_name, expansion);
- strcpy (temp_name + len, dirname + i);
- free (expansion);
- free (dirname);
- dirname = temp_name;
- }
- }
- /* We shouldn't report errors. */
+ dirname = glue_prefix_and_suffix (expansion, filename, user_len);
+ xfree (username);
+ free (expansion);
+ return (dirname);
}
- else
+ }
+
+ /* No preexpansion hook, or the preexpansion hook failed. Look in the
+ password database. */
+ dirname = (char *)NULL;
+#if defined (HAVE_GETPWNAM)
+ user_entry = getpwnam (username);
+#else
+ user_entry = 0;
+#endif
+ if (user_entry == 0)
+ {
+ /* If the calling program has a special syntax for expanding tildes,
+ and we couldn't find a standard expansion, then let them try. */
+ if (tilde_expansion_failure_hook)
{
- len = strlen (user_entry->pw_dir);
- temp_name = xmalloc (1 + len + strlen (dirname + i));
- strcpy (temp_name, user_entry->pw_dir);
- strcpy (temp_name + len, dirname + i);
- free (dirname);
- dirname = temp_name;
+ expansion = (*tilde_expansion_failure_hook) (username);
+ if (expansion)
+ {
+ dirname = glue_prefix_and_suffix (expansion, filename, user_len);
+ free (expansion);
+ }
}
- endpwent ();
- free (username);
+ /* If we don't have a failure hook, or if the failure hook did not
+ expand the tilde, return a copy of what we were passed. */
+ if (dirname == 0)
+ dirname = savestring (filename);
}
+#if defined (HAVE_GETPWENT)
+ else
+ dirname = glue_prefix_and_suffix (user_entry->pw_dir, filename, user_len);
+#endif
+ xfree (username);
+#if defined (HAVE_GETPWENT)
+ endpwent ();
+#endif
return (dirname);
}
static void memory_error_and_abort ();
-static char *
+static void *
xmalloc (bytes)
- int bytes;
+ size_t bytes;
{
- char *temp = (char *)malloc (bytes);
+ void *temp = (char *)malloc (bytes);
if (!temp)
memory_error_and_abort ();
return (temp);
}
-static char *
+static void *
xrealloc (pointer, bytes)
- char *pointer;
+ void *pointer;
int bytes;
{
- char *temp;
+ void *temp;
if (!pointer)
- temp = (char *)malloc (bytes);
+ temp = malloc (bytes);
else
- temp = (char *)realloc (pointer, bytes);
+ temp = realloc (pointer, bytes);
if (!temp)
memory_error_and_abort ();
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