/* getusershell.c -- Return names of valid user shells.
- Copyright (C) 1991 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or modify
+ Copyright (C) 1991, 1997, 2000-2001, 2003-2006, 2008-2014 Free Software
+ Foundation, Inc.
+
+ This program 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 2, or (at your option)
- any later version.
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* Written by David MacKenzie <djm@gnu.ai.mit.edu> */
-#ifdef HAVE_CONFIG_H
-#if defined (CONFIG_BROKETS)
-/* We use <config.h> instead of "config.h" so that a compilation
- using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h
- (which it would do because it found this file in $srcdir). */
#include <config.h>
-#else
-#include "config.h"
-#endif
-#endif
+
+/* Specification. */
+#include <unistd.h>
#ifndef SHELLS_FILE
+# ifndef __DJGPP__
/* File containing a list of nonrestricted shells, one per line. */
-#define SHELLS_FILE "/etc/shells"
+# define SHELLS_FILE "/etc/shells"
+# else
+/* This is a horrible kludge. Isn't there a better way? */
+# define SHELLS_FILE "/dev/env/DJDIR/etc/shells"
+# endif
#endif
-#include <stdio.h>
+#include <stdlib.h>
#include <ctype.h>
-#ifdef STDC_HEADERS
-#include <stdlib.h>
-#else
-char *malloc ();
-char *realloc ();
+#include "stdio--.h"
+#include "xalloc.h"
+
+#if USE_UNLOCKED_IO
+# include "unlocked-io.h"
#endif
-static int readname ();
+static size_t readname (char **, size_t *, FILE *);
+
+#if ! defined ADDITIONAL_DEFAULT_SHELLS && defined __MSDOS__
+# define ADDITIONAL_DEFAULT_SHELLS \
+ "c:/dos/command.com", "c:/windows/command.com", "c:/command.com",
+#else
+# define ADDITIONAL_DEFAULT_SHELLS /* empty */
+#endif
/* List of shells to use if the shells file is missing. */
static char const* const default_shells[] =
{
+ ADDITIONAL_DEFAULT_SHELLS
"/bin/sh", "/bin/csh", "/usr/bin/sh", "/usr/bin/csh", NULL
};
-/* Index of the next shell in `default_shells' to return.
- 0 means we are not using `default_shells'. */
-static int default_index = 0;
+/* Index of the next shell in 'default_shells' to return.
+ 0 means we are not using 'default_shells'. */
+static size_t default_index = 0;
/* Input stream from the shells file. */
static FILE *shellstream = NULL;
/* Line of input from the shells file. */
static char *line = NULL;
-/* Number of bytes allocated for `line'. */
-static int line_size = 0;
+/* Number of bytes allocated for 'line'. */
+static size_t line_size = 0;
\f
/* Return an entry from the shells file, ignoring comment lines.
+ If the file doesn't exist, use the list in DEFAULT_SHELLS (above).
+ In any case, the returned string is in memory allocated through malloc.
Return NULL if there are no more entries. */
char *
-getusershell ()
+getusershell (void)
{
if (default_index > 0)
{
if (default_shells[default_index])
- /* Not at the end of the list yet. */
- return default_shells[default_index++];
+ /* Not at the end of the list yet. */
+ return xstrdup (default_shells[default_index++]);
return NULL;
}
{
shellstream = fopen (SHELLS_FILE, "r");
if (shellstream == NULL)
- {
- /* No shells file. Use the default list. */
- default_index = 1;
- return default_shells[0];
- }
+ {
+ /* No shells file. Use the default list. */
+ default_index = 1;
+ return xstrdup (default_shells[0]);
+ }
}
while (readname (&line, &line_size, shellstream))
{
if (*line != '#')
- return line;
+ return line;
}
- return NULL; /* End of file. */
+ return NULL; /* End of file. */
}
/* Rewind the shells file. */
void
-setusershell ()
+setusershell (void)
{
default_index = 0;
- if (shellstream == NULL)
- shellstream = fopen (SHELLS_FILE, "r");
- else
- fseek (shellstream, 0L, 0);
+ if (shellstream)
+ rewind (shellstream);
}
/* Close the shells file. */
void
-endusershell ()
+endusershell (void)
{
if (shellstream)
{
}
}
-/* Allocate N bytes of memory dynamically, with error checking. */
-
-static char *
-xmalloc (n)
- unsigned n;
-{
- char *p;
-
- p = malloc (n);
- if (p == 0)
- {
- fprintf (stderr, "virtual memory exhausted\n");
- exit (1);
- }
- return p;
-}
-
-/* Reallocate space P to size N, with error checking. */
-
-static char *
-xrealloc (p, n)
- char *p;
- unsigned n;
-{
- p = realloc (p, n);
- if (p == 0)
- {
- fprintf (stderr, "virtual memory exhausted\n");
- exit (1);
- }
- return p;
-}
-
/* Read a line from STREAM, removing any newline at the end.
Place the result in *NAME, which is malloc'd
and/or realloc'd as necessary and can start out NULL,
and whose size is passed and returned in *SIZE.
- Return the number of characters placed in *NAME
+ Return the number of bytes placed in *NAME
if some nonempty sequence was found, otherwise 0. */
-static int
-readname (name, size, stream)
- char **name;
- int *size;
- FILE *stream;
+static size_t
+readname (char **name, size_t *size, FILE *stream)
{
int c;
- int name_index = 0;
-
- if (*name == NULL)
- {
- *size = 10;
- *name = (char *) xmalloc (*size);
- }
+ size_t name_index = 0;
/* Skip blank space. */
while ((c = getc (stream)) != EOF && isspace (c))
/* Do nothing. */ ;
-
- while (c != EOF && !isspace (c))
+
+ for (;;)
{
+ if (*size <= name_index)
+ *name = x2nrealloc (*name, size, sizeof **name);
+ if (c == EOF || isspace (c))
+ break;
(*name)[name_index++] = c;
- while (name_index >= *size)
- {
- *size *= 2;
- *name = (char *) xrealloc (*name, *size);
- }
c = getc (stream);
}
(*name)[name_index] = '\0';
}
#ifdef TEST
-main ()
+int
+main (void)
{
char *s;
projects / gnulib.git / blobdiff