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/* Copyright 1986-1992 Emmet P. Gray.
* Copyright 1996-2002,2007,2009 Alain Knaff.
* This file is part of mtools.
*
* Mtools 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.
*
* Mtools 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 Mtools. If not, see <http://www.gnu.org/licenses/>.
*
* Do filename expansion with the shell.
*/
#include "sysincludes.h"
#include "mtools.h"
#ifndef OS_mingw32msvc
ssize_t safePopenOut(const char **command, char *output, size_t len)
{
int pipefd[2];
pid_t pid;
int status;
ssize_t last;
if(pipe(pipefd)) {
return -2;
}
switch((pid=fork())){
case -1:
return -2;
case 0: /* the son */
close(pipefd[0]);
destroy_privs();
close(1);
close(2); /* avoid nasty error messages on stderr */
if(dup(pipefd[1]) < 0) {
perror("Dup error");
exit(1);
}
close(pipefd[1]);
execvp(command[0], (char**)(command+1));
exit(1);
default:
close(pipefd[1]);
break;
}
last=read(pipefd[0], output, len);
kill(pid,9);
wait(&status);
if(last<0) {
return -1;
}
return last;
}
#endif
const char *expand(const char *input, char *ans)
{
#ifndef OS_mingw32msvc
ssize_t last;
char buf[256];
const char *command[] = { "/bin/sh", "sh", "-c", 0, 0 };
ans[EXPAND_BUF-1]='\0';
if (input == NULL)
return(NULL);
if (*input == '\0')
return("");
/* any thing to expand? */
if (!strpbrk(input, "$*(){}[]\\?`~")) {
strncpy(ans, input, EXPAND_BUF-1);
return(ans);
}
/* popen an echo */
#ifdef HAVE_SNPRINTF
snprintf(buf, 255, "echo %s", input);
#else
sprintf(buf, "echo %s", input);
#endif
command[3]=buf;
last=safePopenOut(command, ans, EXPAND_BUF-1);
if(last<0) {
perror("Pipe read error");
exit(1);
}
if(last)
ans[last-1] = '\0';
else
strncpy(ans, input, EXPAND_BUF-1);
return ans;
#else
strncpy(ans, input, EXPAND_BUF-1);
ans[EXPAND_BUF-1]='\0';
return ans;
#endif
}
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