mirror of
https://github.com/topjohnwu/ndk-busybox.git
synced 2024-11-27 21:50:32 +00:00
72 lines
1.4 KiB
C
72 lines
1.4 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* Utility routines.
|
|
*
|
|
* Copyright (C) 2006 Gabriel Somlo <somlo at cmu.edu>
|
|
*
|
|
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
|
|
*/
|
|
|
|
#include "libbb.h"
|
|
|
|
/* check if path points to an executable file;
|
|
* return 1 if found;
|
|
* return 0 otherwise;
|
|
*/
|
|
int execable_file(const char *name)
|
|
{
|
|
struct stat s;
|
|
return (!access(name, X_OK) && !stat(name, &s) && S_ISREG(s.st_mode));
|
|
}
|
|
|
|
/* search $PATH for an executable file;
|
|
* return allocated string containing full path if found;
|
|
* return NULL otherwise;
|
|
*/
|
|
char *find_execable(const char *filename)
|
|
{
|
|
char *path, *p, *n;
|
|
|
|
p = path = xstrdup(getenv("PATH"));
|
|
while (p) {
|
|
n = strchr(p, ':');
|
|
if (n)
|
|
*n++ = '\0';
|
|
if (*p != '\0') { /* it's not a PATH="foo::bar" situation */
|
|
p = concat_path_file(p, filename);
|
|
if (execable_file(p)) {
|
|
free(path);
|
|
return p;
|
|
}
|
|
free(p);
|
|
}
|
|
p = n;
|
|
}
|
|
free(path);
|
|
return NULL;
|
|
}
|
|
|
|
/* search $PATH for an executable file;
|
|
* return 1 if found;
|
|
* return 0 otherwise;
|
|
*/
|
|
int exists_execable(const char *filename)
|
|
{
|
|
char *ret = find_execable(filename);
|
|
if (ret) {
|
|
free(ret);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#if ENABLE_FEATURE_EXEC_PREFER_APPLETS
|
|
/* just like the real execvp, but try to launch an applet named 'file' first
|
|
*/
|
|
int bb_execvp(const char *file, char *const argv[])
|
|
{
|
|
return execvp(find_applet_by_name(file) ? CONFIG_BUSYBOX_EXEC_PATH : file,
|
|
argv);
|
|
}
|
|
#endif
|