url_pipe.c

MIDI解码程序(用VC编写)

/*
    TiMidity++ -- MIDI to WAVE converter and player
    Copyright (C) 1999-2002 Masanao Izumo <[e-mail]>
    Copyright (C) 1995 Tuukka Toivonen <[e-mail]>

    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
*/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */
#include <stdio.h>
#include <stdlib.h>
#ifndef NO_STRING_H
#include <string.h>
#else
#include <strings.h>
#endif
#include "timidity.h"
#include "url.h"

#ifdef HAVE_POPEN
/* It is not supported command PIPE at Windows */

typedef struct _URL_pipe
{
    char common[sizeof(struct _URL)];
    FILE *fp;
} URL_pipe;

#define PIPE_FP(url) (((URL_pipe *)(url))->fp)

static int name_pipe_check(char *url_string);
static long url_pipe_read(URL url, void *buff, long n);
static char *url_pipe_gets(URL url, char *buff, int n);
static int url_pipe_fgetc(URL url);
static void url_pipe_close(URL url);

struct URL_module URL_module_pipe =
{
    URL_pipe_t,			/* type */
    name_pipe_check,		/* URL checker */
    NULL,			/* initializer */
    url_pipe_open,		/* open */
    NULL			/* must be NULL */
};

/* url_string := "command|" */
static int name_pipe_check(char *url_string)
{
#ifdef PIPE_SCHEME_ENABLE
    char *p;
    p = strrchr(url_string, '|');
    if(p == NULL)
	return 0;
    p++;
    while(*p == ' ')
	p++;
    return *p == '\0';
#else
    return 0;
#endif
}

URL url_pipe_open(char *command)
{
    URL_pipe *url;
    char buff[BUFSIZ], *p;

    strncpy(buff, command, sizeof(buff));
    buff[sizeof(buff) - 1] = '\0';
    p = strrchr(buff, '|');
    if(p != NULL)
    {
	char *q;

	q = p + 1;
	while(*q == ' ')
	    q++;
	if(*q == '\0')
	{
	    p--;
	    while(buff < p && *p == ' ')
		p--;
	    if(buff == p)
	    {
		errno = ENOENT;
		url_errno = URLERR_IURLF;
		return NULL;
	    }
	    p[1] = '\0';
	}
    }

    url = (URL_pipe *)alloc_url(sizeof(URL_pipe));
    if(url == NULL)
    {
	url_errno = errno;
	return NULL;
    }

    /* common members */
    URLm(url, type)      = URL_pipe_t;
    URLm(url, url_read)  = url_pipe_read;
    URLm(url, url_gets)  = url_pipe_gets;
    URLm(url, url_fgetc) = url_pipe_fgetc;
    URLm(url, url_seek)  = NULL;
    URLm(url, url_tell)  = NULL;
    URLm(url, url_close) = url_pipe_close;

    /* private members */
    url->fp = NULL;

    if((url->fp = popen(buff, "r")) == NULL)
    {
	url_pipe_close((URL)url);
	url_errno = errno;
	return NULL;
    }

    return (URL)url;
}

static long url_pipe_read(URL url, void *buff, long n)
{
    return (long)fread(buff, 1, n, PIPE_FP(url));
}

static char *url_pipe_gets(URL url, char *buff, int n)
{
    return fgets(buff, n, PIPE_FP(url));
}

static int url_pipe_fgetc(URL url)
{
#ifdef getc
    return getc(PIPE_FP(url));
#else
    return fgetc(PIPE_FP(url));
#endif /* getc */
}

static void url_pipe_close(URL url)
{
    int save_errno = errno;
    if(PIPE_FP(url) != NULL)
	pclose(PIPE_FP(url));
    free(url);
    errno = save_errno;
}

#else /* HAVE_POPEN */
struct URL_module URL_module_pipe =
{
    URL_none_t,			/* type */
    NULL,			/* URL checker */
    NULL,			/* initializer */
    NULL,			/* open */
    NULL			/* must be NULL */
};
URL url_pipe_open(char *command) { return NULL; } /* dmy */
#endif