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/*
* SPL - The SPL Programming Language
* Copyright (C) 2004, 2005 Clifford Wolf <clifford@clifford.at>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* mod_system.c: Module for calling shell commands
*/
/**
* This module provides a simple API for calling shell commands
*/
#define _GNU_SOURCE
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "spl.h"
#include "compat.h"
extern void SPL_ABI(spl_mod_system_init)(struct spl_vm *vm, struct spl_module *mod, int restore);
extern void SPL_ABI(spl_mod_system_done)(struct spl_vm *vm, struct spl_module *mod);
/**
* This function calls the specified shell command and returns the text written
* to stdout.
*
* If the output is not UTF-8 encoded, the encoding must be specified with a
* 2nd parameter. Valid encodings are the same as for the '#encoding' compiler
* pragma (see 'SPL Language Reference' for a list).
*
* If UTF-8 encoding is expected but the output fails to pass the UTF-8 test,
* the output is assumed to be latin1 encoded.
*
* A newline at the end of the output is automatically removed.
*/
// builtin system(command, encoding)
static struct spl_node *handler_system(struct spl_task *task, void *data UNUSED)
{
char *command = spl_clib_get_string(task);
char *encoding = spl_clib_get_string(task);
char *output = malloc(512);
int len = 0;
int buffer = 512;
int p[2];
pipe(p);
int pid = fork();
if ( !pid ) {
close(1);
close(p[0]);
dup2(p[1], 1);
if (task->vm->current_dir_name)
chdir(task->vm->current_dir_name);
execlp("sh", "sh", "-c", command, NULL);
_exit(1);
}
close(p[1]);
while (1) {
int rc = read(p[0], output+len, 512);
if (rc <= 0) break;
len += rc;
if (len + 512 > buffer) {
buffer = len*2 + 512;
output = realloc(output, buffer);
}
}
close(p[0]);
waitpid(pid, 0, 0);
output = realloc(output, len+1);
output[len] = 0;
if (len > 0 && output[len-1] == '\n')
output[len-1] = 0;
if (*encoding) {
char *old_output = output;
output = spl_utf8_import(old_output, encoding);
if (!output)
output = old_output;
else
free(old_output);
}
if (spl_utf8_check(output)) {
char *old_output = output;
output = spl_utf8_import(old_output, "latin_1");
free(old_output);
/* this should never happen */
if (!output) output = strdup("");
}
return SPL_NEW_STRING(output);
}
void SPL_ABI(spl_mod_system_init)(struct spl_vm *vm, struct spl_module *mod UNUSED, int restore UNUSED)
{
spl_clib_reg(vm, "system", handler_system, 0);
}
void SPL_ABI(spl_mod_system_done)(struct spl_vm *vm UNUSED, struct spl_module *mod UNUSED)
{
return;
}
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