ircd-hybrid-7.2/src/fileio.c

/*
 *  ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
 *  fileio.c: Provides a file input-output interface to ircd.
 *
 *  Copyright (C) 2002 by the past and present ircd coders, and others.
 *
 *  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
 *
 *  $Id$
 */

#include "stdinc.h"
#include "fileio.h"
#include "irc_string.h"
#include "memory.h"
#include "s_log.h"

/* The following are to get the fd manipulation routines. eww. */
#include "fdlist.h"


/*
 * Wrappers around open() / close() for fileio, since a whole bunch of
 * code that should be using the fbopen() / fbclose() code isn't.
 * Grr. -- adrian
 */
int
file_open(fde_t *F, const char *filename, int mode, int fmode)
{
  int fd;

  if (number_fd == hard_fdlimit)
  {
    errno = ENFILE;
    return -1;
  }

  if ((fd = open(filename, mode, fmode)) < 0)
    return -1;

  fd_open(F, fd, 0, filename);
  return 0;
}

void
file_close(fde_t *F)
{
  fd_close(F);
}

FBFILE *
fbopen(const char *filename, const char *mode)
{
  FBFILE *fb = MyMalloc(sizeof(FBFILE));
  int openmode = 0;
  int pmode = 0;

  while (*mode)
    switch (*mode++)
    {
      case 'r':
        openmode = O_RDONLY;
        break;
      case 'w':
        openmode = O_WRONLY | O_CREAT | O_TRUNC;
        pmode = 0644;
        break;
      case 'a':
        openmode = O_WRONLY | O_CREAT | O_APPEND;
        pmode = 0644;
        break;
      case '+':
        openmode &= ~(O_RDONLY | O_WRONLY);
        openmode |= O_RDWR;
    }

  if (file_open(&fb->F, filename, openmode, pmode) < 0)
  {
    MyFree(fb);
    return NULL;
  }

  fb->ptr = fb->endp = fb->buf;
  fb->flags = 0;
  fb->pbptr = NULL;
  return fb;
}

int
fbrewind(FBFILE *fb)
{
  fb->ptr   = fb->endp = fb->buf;
  fb->flags = 0;
  fb->pbptr = NULL;

  lseek(fb->F.fd, 0, SEEK_SET);
  return 0;
}

void
fbclose(FBFILE *fb)
{
  if (fb == NULL)
    return;
  file_close(&fb->F);
  MyFree(fb);
}

static int
fbfill(FBFILE *fb)
{
  int n;

  if (fb->flags)
    return -1;

  n = read(fb->F.fd, fb->buf, BUFSIZ);

  if (n > 0)
  {
    fb->ptr  = fb->buf;
    fb->endp = fb->buf + n;
  }
  else if (n < 0)
    fb->flags |= FB_FAIL;
  else
    fb->flags |= FB_EOF;

  return n;
}

int
fbgetc(FBFILE *fb)
{
  if (fb->pbptr != NULL)
    if ((fb->pbptr == (fb->pbuf + BUFSIZ)) || !*fb->pbptr)
      fb->pbptr = NULL;

  if (fb->ptr < fb->endp || fbfill(fb) > 0)
    return *fb->ptr++;

  return EOF;
}

void
fbungetc(char c, FBFILE *fb)
{
  if (fb->pbptr == NULL)
    fb->pbptr = fb->pbuf + BUFSIZ;

  if (fb->pbptr != fb->pbuf)
    *--fb->pbptr = c;
}

char *
fbgets(char *buf, size_t len, FBFILE *fb)
{
  char *p = buf;
  assert(0 < len);

  if (fb->pbptr != NULL)
  {
    strlcpy(buf, fb->pbptr, len);
    fb->pbptr = NULL;
    return buf;
  }

  if (fb->ptr == fb->endp && fbfill(fb) < 1)
    return NULL;

  --len;

  while (len--)
  {
    *p = *fb->ptr++;

    if ('\n' == *p)
    {
      ++p;
      break;
    }

    /* deal with CR's */
    else if ('\r' == *p)
    {
      if (fb->ptr < fb->endp || fbfill(fb) > 0)
      {
        if ('\n' == *fb->ptr)
          ++fb->ptr;
      }

      *p++ = '\n';
      break;
    }

    ++p;

    if (fb->ptr == fb->endp && fbfill(fb) < 1)
      break;
  }

  *p = '\0';
  return buf;
}

int
fbputs(const char *str, FBFILE *fb, size_t nbytes)
{
  int n = -1;

  if (0 == fb->flags)
  {
    assert(strlen(str) == nbytes);
    n = write(fb->F.fd, str, nbytes);

    if (n == -1)
      fb->flags |= FB_FAIL;
  }

  return n;
}

int
save_spare_fd(const char *spare_purpose)
{
  int spare_fd = open(PATH_DEVNULL, O_RDONLY, 0);

  if (spare_fd < 0)
  {
    ilog(L_NOTICE, "Failed to reserve low fd for %s - open failed", spare_purpose);
    return -1;
  }
  else if (spare_fd > 255)
  {
    ilog(L_NOTICE, "Failed to reserve low fd for %s - too high", spare_purpose);
    close(spare_fd);
    return -1;
  }

  return spare_fd;
}
1	/*
2	* ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
3	* fileio.c: Provides a file input-output interface to ircd.
4	*
5	* Copyright (C) 2002 by the past and present ircd coders, and others.
6	*
7	* This program is free software; you can redistribute it and/or modify
8	* it under the terms of the GNU General Public License as published by
9	* the Free Software Foundation; either version 2 of the License, or
10	* (at your option) any later version.
11	*
12	* This program is distributed in the hope that it will be useful,
13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15	* GNU General Public License for more details.
16	*
17	* You should have received a copy of the GNU General Public License
18	* along with this program; if not, write to the Free Software
19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
20	* USA
21	*
22	* $Id$
23	*/
24
25	#include "stdinc.h"
26	#include "fileio.h"
27	#include "irc_string.h"
28	#include "memory.h"
29	#include "s_log.h"
30
31	/* The following are to get the fd manipulation routines. eww. */
32	#include "fdlist.h"
33
34
35	/*
36	* Wrappers around open() / close() for fileio, since a whole bunch of
37	* code that should be using the fbopen() / fbclose() code isn't.
38	* Grr. -- adrian
39	*/
40	int
41	file_open(fde_t F, const char filename, int mode, int fmode)
42	{
43	int fd;
44
45	if (number_fd == hard_fdlimit)
46	{
47	errno = ENFILE;
48	return -1;
49	}
50
51	if ((fd = open(filename, mode, fmode)) < 0)
52	return -1;
53
54	fd_open(F, fd, 0, filename);
55	return 0;
56	}
57
58	void
59	file_close(fde_t *F)
60	{
61	fd_close(F);
62	}
63
64	FBFILE *
65	fbopen(const char filename, const char mode)
66	{
67	FBFILE *fb = MyMalloc(sizeof(FBFILE));
68	int openmode = 0;
69	int pmode = 0;
70
71	while (*mode)
72	switch (*mode++)
73	{
74	case 'r':
75	openmode = O_RDONLY;
76	break;
77	case 'w':
78	openmode = O_WRONLY \| O_CREAT \| O_TRUNC;
79	pmode = 0644;
80	break;
81	case 'a':
82	openmode = O_WRONLY \| O_CREAT \| O_APPEND;
83	pmode = 0644;
84	break;
85	case '+':
86	openmode &= ~(O_RDONLY \| O_WRONLY);
87	openmode \|= O_RDWR;
88	}
89
90	if (file_open(&fb->F, filename, openmode, pmode) < 0)
91	{
92	MyFree(fb);
93	return NULL;
94	}
95
96	fb->ptr = fb->endp = fb->buf;
97	fb->flags = 0;
98	fb->pbptr = NULL;
99	return fb;
100	}
101
102	int
103	fbrewind(FBFILE *fb)
104	{
105	fb->ptr = fb->endp = fb->buf;
106	fb->flags = 0;
107	fb->pbptr = NULL;
108
109	lseek(fb->F.fd, 0, SEEK_SET);
110	return 0;
111	}
112
113	void
114	fbclose(FBFILE *fb)
115	{
116	if (fb == NULL)
117	return;
118	file_close(&fb->F);
119	MyFree(fb);
120	}
121
122	static int
123	fbfill(FBFILE *fb)
124	{
125	int n;
126
127	if (fb->flags)
128	return -1;
129
130	n = read(fb->F.fd, fb->buf, BUFSIZ);
131
132	if (n > 0)
133	{
134	fb->ptr = fb->buf;
135	fb->endp = fb->buf + n;
136	}
137	else if (n < 0)
138	fb->flags \|= FB_FAIL;
139	else
140	fb->flags \|= FB_EOF;
141
142	return n;
143	}
144
145	int
146	fbgetc(FBFILE *fb)
147	{
148	if (fb->pbptr != NULL)
149	if ((fb->pbptr == (fb->pbuf + BUFSIZ)) \|\| !*fb->pbptr)
150	fb->pbptr = NULL;
151
152	if (fb->ptr < fb->endp \|\| fbfill(fb) > 0)
153	return *fb->ptr++;
154
155	return EOF;
156	}
157
158	void
159	fbungetc(char c, FBFILE *fb)
160	{
161	if (fb->pbptr == NULL)
162	fb->pbptr = fb->pbuf + BUFSIZ;
163
164	if (fb->pbptr != fb->pbuf)
165	*--fb->pbptr = c;
166	}
167
168	char *
169	fbgets(char buf, size_t len, FBFILE fb)
170	{
171	char *p = buf;
172	assert(0 < len);
173
174	if (fb->pbptr != NULL)
175	{
176	strlcpy(buf, fb->pbptr, len);
177	fb->pbptr = NULL;
178	return buf;
179	}
180
181	if (fb->ptr == fb->endp && fbfill(fb) < 1)
182	return NULL;
183
184	--len;
185
186	while (len--)
187	{
188	p = fb->ptr++;
189
190	if ('\n' == *p)
191	{
192	++p;
193	break;
194	}
195
196	/* deal with CR's */
197	else if ('\r' == *p)
198	{
199	if (fb->ptr < fb->endp \|\| fbfill(fb) > 0)
200	{
201	if ('\n' == *fb->ptr)
202	++fb->ptr;
203	}
204
205	*p++ = '\n';
206	break;
207	}
208
209	++p;
210
211	if (fb->ptr == fb->endp && fbfill(fb) < 1)
212	break;
213	}
214
215	*p = '\0';
216	return buf;
217	}
218
219	int
220	fbputs(const char str, FBFILE fb, size_t nbytes)
221	{
222	int n = -1;
223
224	if (0 == fb->flags)
225	{
226	assert(strlen(str) == nbytes);
227	n = write(fb->F.fd, str, nbytes);
228
229	if (n == -1)
230	fb->flags \|= FB_FAIL;
231	}
232
233	return n;
234	}
235
236	int
237	save_spare_fd(const char *spare_purpose)
238	{
239	int spare_fd = open(PATH_DEVNULL, O_RDONLY, 0);
240
241	if (spare_fd < 0)
242	{
243	ilog(L_NOTICE, "Failed to reserve low fd for %s - open failed", spare_purpose);
244	return -1;
245	}
246	else if (spare_fd > 255)
247	{
248	ilog(L_NOTICE, "Failed to reserve low fd for %s - too high", spare_purpose);
249	close(spare_fd);
250	return -1;
251	}
252
253	return spare_fd;
254	}
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