84 lines
1.4 KiB
C
Executable file
84 lines
1.4 KiB
C
Executable file
/*
|
|
* Do filename expansion with the shell.
|
|
*/
|
|
|
|
#define EXPAND_BUF 2048
|
|
|
|
#include "sysincludes.h"
|
|
#include "mtools.h"
|
|
|
|
|
|
int safePopenOut(char **command, char *output, int len)
|
|
{
|
|
int pipefd[2];
|
|
pid_t pid;
|
|
int status;
|
|
int 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 */
|
|
dup(pipefd[1]);
|
|
close(pipefd[1]);
|
|
execvp(command[0], 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;
|
|
}
|
|
|
|
|
|
|
|
const char *expand(const char *input, char *ans)
|
|
{
|
|
int last;
|
|
char buf[256];
|
|
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;
|
|
}
|