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don't use popen/pclose. Do it inline.

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This commit is contained in:
Todd C. Miller 1998-04-06 03:33:55 +00:00
parent 09bb1a3bf7
commit 1014adbe09
1 changed files with 40 additions and 19 deletions
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59
getcwd.c
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@ -22,6 +22,7 @@
* This module contains getcwd(3) for those systems that lack it.
* getcwd(3) returns a pointer to the current working dir. It uses
* path as a copy-out parameter and malloc(3)s space if path is NULL.
* This implementation of getcwd(3) restricts len(path) to be < MAXPATHLEN.
*
* Todd C. Miller (millert@colorado.edu) Fri Jun 3 18:32:19 MDT 1994
*/
@ -50,9 +51,9 @@ static char rcsid[] = "$Id$";
#endif /* HAVE_MALLOC_H && !STDC_HEADERS */
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/param.h>
#include <netinet/in.h>
#include <sys/in.h>
#include <pathnames.h>
#include "compat.h"
@ -64,17 +65,10 @@ extern char *malloc __P((size_t));
extern char *strcpy __P((char *, const char *));
extern int strlen __P((const char *));
extern char *getwd __P((char *));
extern FILE *popen __P((const char *, const char *));
extern int pclose __P((FILE *));
extern char *fgets __P((char *, int, FILE *));
#endif /* !STDC_HEADERS */
#ifndef _PATH_PWD
#define _PATH_PWD "pwd"
#endif /* _PATH_PWD */
/*
* Since we can't count on this being defined...
*/
@ -87,20 +81,21 @@ extern int errno;
*
* getcwd() returns a pointer to the current working dir. It uses
* path as a copy-out parameter and malloc(3)s space if path is NULL.
* getcwd() will use getwd() if available, else it will use pwd(1).
*/
char * getcwd(path, len)
char * getcwd(path, psize)
char * path; /* path to copy into */
size_t len; /* length of path */
size_t psize; /* size of path */
{
char buf[MAXPATHLEN+1]; /* +1 for the newline */
size_t blen; /* length of buf */
#ifndef HAVE_GETWD
FILE * pwd; /* for popen */
#endif /* HAVE_GETWD */
FILE * pwd; /* stream for "pwd" process */
int fd[2]; /* for pipe(2) */
pid_t pid; /* pid of "pwd" process */
int status; /* status from wait(2) */
if (path && len <= 0) {
/* sanity check */
if (path && psize == 0) {
errno = EINVAL;
return(NULL);
}
@ -108,15 +103,40 @@ char * getcwd(path, len)
/*
* open a pipe to pwd and read a line
*/
if (!(pwd = popen(_PATH_PWD, "r")))
if (pipe(fd) < 0)
return(NULL);
switch ((pid = fork())) {
case -1:
/* fork failed */
(void) close(fd[0]);
(void) close(fd[1]);
return(NULL);
case 0:
/* in child */
(void) dup2(fd[0], 0);
(void) dup2(fd[1], 1);
(void) close(fd[0]);
(void) close(fd[1]);
execl(_PATH_PWD, "pwd", NULL);
_exit(-1); /* should not happen */
}
/* in parent */
if ((pwd = fdopen(fd[0], "r")) == NULL) {
(void) close(fd[0]);
(void) close(fd[1]);
return(NULL);
}
if (!fgets(buf, sizeof(buf), pwd)) {
errno = EACCES; /* what an assumption... */
pclose(pwd);
return(NULL);
}
pclose(pwd);
/* wait for the pipe to close */
while (wait(&status) != pid)
;
blen = strlen(buf);
if (buf[blen - 1] == '\n')
@ -126,7 +146,8 @@ char * getcwd(path, len)
return(NULL);
}
if (len < blen + 1) {
/* sanity check */
if (path && psize < blen + 1) {
errno = ERANGE;
return(NULL);
}