mirror of
https://github.com/autc04/Retro68.git
synced 2024-12-12 11:29:30 +00:00
72 lines
1.3 KiB
C
72 lines
1.3 KiB
C
#ifndef _NO_EXECVE
|
|
|
|
/* execvp.c */
|
|
|
|
/* This and the other exec*.c files in this directory require
|
|
the target to provide the _execve syscall. */
|
|
|
|
#include <_ansi.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <dirent.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <ctype.h>
|
|
|
|
#define PATH_DELIM ':'
|
|
|
|
/*
|
|
* Copy string, until c or <nul> is encountered.
|
|
* NUL-terminate the destination string (s1).
|
|
*/
|
|
|
|
static char *
|
|
strccpy (char *s1,
|
|
char *s2,
|
|
char c)
|
|
{
|
|
char *dest = s1;
|
|
|
|
while (*s2 && *s2 != c)
|
|
*s1++ = *s2++;
|
|
*s1 = 0;
|
|
|
|
return dest;
|
|
}
|
|
|
|
int
|
|
execvp (const char *file,
|
|
char * const argv[])
|
|
{
|
|
char *path = getenv ("PATH");
|
|
char buf[MAXNAMLEN];
|
|
|
|
/* If $PATH doesn't exist, just pass FILE on unchanged. */
|
|
if (!path)
|
|
return execv (file, argv);
|
|
|
|
/* If FILE contains a directory, don't search $PATH. */
|
|
if (strchr (file, '/')
|
|
)
|
|
return execv (file, argv);
|
|
|
|
while (*path)
|
|
{
|
|
strccpy (buf, path, PATH_DELIM);
|
|
/* An empty entry means the current directory. */
|
|
if (*buf != 0 && buf[strlen(buf) - 1] != '/')
|
|
strcat (buf, "/");
|
|
strcat (buf, file);
|
|
if (execv (buf, argv) == -1 && errno != ENOENT)
|
|
return -1;
|
|
while (*path && *path != PATH_DELIM)
|
|
path++;
|
|
if (*path == PATH_DELIM)
|
|
path++; /* skip over delim */
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
#endif /* !_NO_EXECVE */
|