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/* $Header: popen.c,v 4.0 91/03/20 01:34:50 lwall Locked $
*
* (C) Copyright 1988, 1990 Diomidis Spinellis.
*
* You may distribute under the terms of the GNU General Public License
* as specified in the README file that comes with the perl 3.0 kit.
*
* $Log: popen.c,v $
* Revision 4.0 91/03/20 01:34:50 lwall
* 4.0 baseline.
*
* Revision 3.0.1.2 90/08/09 04:04:42 lwall
* patch19: various MSDOS and OS/2 patches folded in
*
* Revision 3.0.1.1 90/03/27 16:11:57 lwall
* patch16: MSDOS support
*
* Revision 1.1 90/03/18 20:32:20 dds
* Initial revision
*
*/
/*
* Popen and pclose for MS-DOS
*/
#include <stdlib.h>
#include <stdio.h>
#include <process.h>
/*
* Possible actions on an popened file
*/
enum action {
delete, /* Used for "r". Delete the tmp file */
execute /* Used for "w". Execute the command. */
};
/*
* Linked list of things to do at the end of the program execution.
*/
static struct todo {
FILE *f; /* File we are working on (to fclose) */
const char *name; /* Name of the file (to unlink) */
const char *command; /* Command to execute */
enum action what; /* What to do (execute or delete) */
struct todo *next; /* Next structure */
} *todolist;
/* Clean up function */
static int close_pipes(void);
/*
* Add a file f running the command command on file name to the list
* of actions to be done at the end. The action is specified in what.
* Return -1 on failure, 0 if ok.
*/
static int
add(FILE *f, const char *command, const char *name, enum action what)
{
struct todo *p;
if ((p = (struct todo *) malloc(sizeof(struct todo))) == NULL)
return -1;
p->f = f;
p->command = command;
p->name = name;
p->what = what;
p->next = todolist;
todolist = p;
return 0;
}
FILE *
mypopen(const char *command, const char *t)
{
char buff[256];
char *name;
FILE *f;
static init = 0;
if (!init)
if (onexit(close_pipes) == NULL)
return NULL;
else
init++;
if ((name = tempnam((char*)NULL, "pp")) == NULL)
return NULL;
switch (*t) {
case 'r':
sprintf(buff, "%s >%s", command, name);
if (system(buff) || (f = fopen(name, "r")) == NULL) {
free(name);
return NULL;
}
if (add(f, command, name, delete)) {
(void)fclose(f);
(void)unlink(name);
free(name);
return NULL;
}
return f;
case 'w':
if ((f = fopen(name, "w")) == NULL) {
free(name);
return NULL;
}
if (add(f, command, name, execute)) {
(void)fclose(f);
(void)unlink(name);
free(name);
return NULL;
}
return f;
default:
free(name);
return NULL;
}
}
int
mypclose(FILE *f)
{
struct todo *p, **prev;
char buff[256];
const char *name;
int status;
for (p = todolist, prev = &todolist; p; prev = &(p->next), p = p->next)
if (p->f == f) {
*prev = p->next;
name = p->name;
switch (p->what) {
case delete:
free(p);
if (fclose(f) == EOF) {
(void)unlink(name);
status = EOF;
} else if (unlink(name) < 0)
status = EOF;
else
status = 0;
free((void*)name);
return status;
case execute:
(void)sprintf(buff, "%s <%s", p->command, p->name);
free(p);
if (fclose(f) == EOF) {
(void)unlink(name);
status = EOF;
} else if (system(buff)) {
(void)unlink(name);
status = EOF;
} else if (unlink(name) < 0)
status = EOF;
else
status = 0;
free((void*)name);
return status;
default:
return EOF;
}
}
return EOF;
}
/*
* Clean up at the end. Called by the onexit handler.
*/
static int
close_pipes(void)
{
struct todo *p;
for (p = todolist; p; p = p->next)
(void)mypclose(p->f);
return 0;
}
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