Blame src/userfile.c

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/*
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 *  Get full filename
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 *  Copyright (c) 2003 by Jaroslav Kysela <perex@perex.cz>
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 *
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 *   This library is free software; you can redistribute it and/or modify
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 *   it under the terms of the GNU Lesser General Public License as
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 *   published by the Free Software Foundation; either version 2.1 of
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 *   the License, or (at your option) any later version.
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 *
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 *   This program is distributed in the hope that it will be useful,
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 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *   GNU Lesser General Public License for more details.
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 *
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 *   You should have received a copy of the GNU Lesser General Public
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 *   License along with this library; if not, write to the Free Software
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 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
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 *
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 */
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#include <config.h>
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#include <string.h>
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#include <errno.h>
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#include <assert.h>
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/**
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 * \brief Get the full file name
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 * \param file The file name string to parse
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 * \param result The pointer to store the resultant file name
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 * \return 0 if successful, or a negative error code
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 *
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 * Parses the given file name with POSIX-Shell-like expansion and
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 * stores the first matchine one.  The returned string is strdup'ed.
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 */
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#ifdef HAVE_WORDEXP
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#include <wordexp.h>
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int snd_user_file(const char *file, char **result)
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{
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	wordexp_t we;
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	int err;
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	assert(file && result);
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	err = wordexp(file, &we, WRDE_NOCMD);
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	switch (err) {
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	case WRDE_NOSPACE:
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		wordfree(&we);
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		return -ENOMEM;
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	case 0:
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		if (we.we_wordc == 1)
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			break;
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		wordfree(&we);
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		/* fall thru */
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	default:
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		return -EINVAL;
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	}
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	*result = strdup(we.we_wordv[0]);
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	wordfree(&we);
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	if (*result == NULL)
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		return -ENOMEM;
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	return 0;
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}
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#else /* !HAVE_WORDEX */
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#include <sys/types.h>
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#include <unistd.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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int snd_user_file(const char *file, char **result)
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{
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	int err;
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	size_t len;
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	char *buf = NULL;
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	assert(file && result);
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	*result = NULL;
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	/* expand ~/ if needed */
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	if (file[0] == '~' && file[1] == '/') {
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		const char *home = getenv("HOME");
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		if (home == NULL) {
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			struct passwd pwent, *p = NULL;
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			uid_t id = getuid();
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			size_t bufsize = 1024;
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			buf = malloc(bufsize);
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			if (buf == NULL)
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				goto out;
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			while ((err = getpwuid_r(id, &pwent, buf, bufsize, &p)) == ERANGE) {
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				char *newbuf;
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				bufsize += 1024;
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				if (bufsize < 1024)
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					break;
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				newbuf = realloc(buf, bufsize);
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				if (newbuf == NULL)
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					goto out;
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				buf = newbuf;
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			}
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			home = err ? "" : pwent.pw_dir;
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		}
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		len = strlen(home) + strlen(&file[2]) + 2;
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		*result = malloc(len);
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		if (*result)
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			snprintf(*result, len, "%s/%s", home, &file[2]);
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	} else {
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		*result = strdup(file);
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	}
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out:
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	if (buf)
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		free(buf);
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	if (*result == NULL)
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		return -ENOMEM;
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	return 0;
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}
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#endif /* HAVE_WORDEXP */