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adx |
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/* |
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* ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd). |
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* fileio.c: Provides a file input-output interface to ircd. |
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* |
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* Copyright (C) 2002 by the past and present ircd coders, and others. |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
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* USA |
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* |
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knight |
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* $Id$ |
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adx |
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*/ |
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#include "stdinc.h" |
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#include "fileio.h" |
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#include "irc_string.h" |
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#include "memory.h" |
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#include "s_log.h" |
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/* The following are to get the fd manipulation routines. eww. */ |
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#include "fdlist.h" |
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/* |
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* Wrappers around open() / close() for fileio, since a whole bunch of |
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* code that should be using the fbopen() / fbclose() code isn't. |
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* Grr. -- adrian |
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*/ |
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int |
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file_open(fde_t *F, const char *filename, int mode, int fmode) |
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{ |
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int fd; |
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#ifdef _WIN32 |
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DWORD dwDesiredAccess = 0; |
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switch (mode & ~(O_CREAT | O_TRUNC | O_APPEND)) |
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{ |
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case O_RDONLY: |
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dwDesiredAccess = GENERIC_READ; |
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break; |
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case O_WRONLY: |
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dwDesiredAccess = GENERIC_WRITE; |
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break; |
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case O_RDWR: |
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dwDesiredAccess = GENERIC_READ | GENERIC_WRITE; |
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} |
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fd = (int) CreateFile( |
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filename, |
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dwDesiredAccess, |
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FILE_SHARE_READ | ((dwDesiredAccess & GENERIC_WRITE) ? 0:FILE_SHARE_WRITE), |
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NULL, |
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((mode & O_CREAT) == 0) ? OPEN_EXISTING : |
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((mode & O_TRUNC) ? CREATE_ALWAYS : OPEN_ALWAYS), |
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FILE_ATTRIBUTE_NORMAL, |
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NULL |
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); |
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if (fd == (int)INVALID_HANDLE_VALUE) |
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{ |
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errno = GetLastError(); |
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return -1; |
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} |
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if ((mode & O_APPEND)) |
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SetFilePointer((HANDLE)fd, 0, NULL, FILE_END); |
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#else |
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if (number_fd == hard_fdlimit) |
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{ |
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errno = ENFILE; |
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return -1; |
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} |
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if ((fd = open(filename, mode, fmode)) < 0) |
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return -1; |
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#endif |
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fd_open(F, fd, 0, filename); |
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return 0; |
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} |
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void |
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file_close(fde_t *F) |
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{ |
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fd_close(F); |
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} |
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FBFILE * |
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fbopen(const char *filename, const char *mode) |
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{ |
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FBFILE *fb = MyMalloc(sizeof(FBFILE)); |
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int openmode = 0; |
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int pmode = 0; |
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while (*mode) |
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switch (*mode++) |
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{ |
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case 'r': |
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openmode = O_RDONLY; |
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break; |
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case 'w': |
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openmode = O_WRONLY | O_CREAT | O_TRUNC; |
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pmode = 0644; |
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break; |
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case 'a': |
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openmode = O_WRONLY | O_CREAT | O_APPEND; |
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pmode = 0644; |
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break; |
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case '+': |
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openmode &= ~(O_RDONLY | O_WRONLY); |
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openmode |= O_RDWR; |
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} |
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if (file_open(&fb->F, filename, openmode, pmode) < 0) |
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{ |
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MyFree(fb); |
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return NULL; |
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} |
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fb->ptr = fb->endp = fb->buf; |
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fb->flags = 0; |
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fb->pbptr = NULL; |
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return fb; |
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} |
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int |
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fbrewind(FBFILE *fb) |
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{ |
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fb->ptr = fb->endp = fb->buf; |
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fb->flags = 0; |
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fb->pbptr = NULL; |
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#ifdef _WIN32 |
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SetFilePointer((HANDLE)fb->F.fd, 0, NULL, FILE_BEGIN); |
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#else |
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lseek(fb->F.fd, 0, SEEK_SET); |
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#endif |
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return 0; |
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} |
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void |
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fbclose(FBFILE *fb) |
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{ |
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if (fb == NULL) |
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return; |
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file_close(&fb->F); |
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MyFree(fb); |
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} |
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static int |
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fbfill(FBFILE *fb) |
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{ |
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int n; |
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if (fb->flags) |
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return -1; |
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#ifdef _WIN32 |
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if (!ReadFile((HANDLE)fb->F.fd, fb->buf, BUFSIZ, (LPDWORD)&n, NULL)) |
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n = -1; |
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#else |
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n = read(fb->F.fd, fb->buf, BUFSIZ); |
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#endif |
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if (n > 0) |
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{ |
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fb->ptr = fb->buf; |
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fb->endp = fb->buf + n; |
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} |
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else if (n < 0) |
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fb->flags |= FB_FAIL; |
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else |
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fb->flags |= FB_EOF; |
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return n; |
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} |
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int |
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fbgetc(FBFILE *fb) |
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{ |
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if (fb->pbptr != NULL) |
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if ((fb->pbptr == (fb->pbuf + BUFSIZ)) || !*fb->pbptr) |
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fb->pbptr = NULL; |
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if (fb->ptr < fb->endp || fbfill(fb) > 0) |
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return *fb->ptr++; |
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return EOF; |
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} |
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void |
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fbungetc(char c, FBFILE *fb) |
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{ |
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if (fb->pbptr == NULL) |
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fb->pbptr = fb->pbuf + BUFSIZ; |
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if (fb->pbptr != fb->pbuf) |
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*--fb->pbptr = c; |
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} |
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char * |
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fbgets(char *buf, size_t len, FBFILE *fb) |
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{ |
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char *p = buf; |
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assert(0 < len); |
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if (fb->pbptr != NULL) |
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{ |
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strlcpy(buf, fb->pbptr, len); |
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fb->pbptr = NULL; |
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return buf; |
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} |
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if (fb->ptr == fb->endp && fbfill(fb) < 1) |
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return NULL; |
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--len; |
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while (len--) |
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{ |
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*p = *fb->ptr++; |
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if ('\n' == *p) |
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{ |
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++p; |
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break; |
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} |
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/* deal with CR's */ |
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else if ('\r' == *p) |
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{ |
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if (fb->ptr < fb->endp || fbfill(fb) > 0) |
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{ |
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if ('\n' == *fb->ptr) |
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++fb->ptr; |
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} |
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*p++ = '\n'; |
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break; |
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} |
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++p; |
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if (fb->ptr == fb->endp && fbfill(fb) < 1) |
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break; |
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} |
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*p = '\0'; |
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return buf; |
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} |
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int |
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fbputs(const char *str, FBFILE *fb, size_t nbytes) |
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{ |
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int n = -1; |
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if (0 == fb->flags) |
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{ |
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assert(strlen(str) == nbytes); |
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#ifdef _WIN32 |
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if (!WriteFile((HANDLE)fb->F.fd, str, nbytes, (LPDWORD)&n, NULL)) |
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n = -1; |
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#else |
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n = write(fb->F.fd, str, nbytes); |
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#endif |
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if (n == -1) |
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fb->flags |= FB_FAIL; |
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} |
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return n; |
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} |
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int |
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save_spare_fd(const char *spare_purpose) |
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{ |
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int spare_fd = open(PATH_DEVNULL, O_RDONLY, 0); |
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if (spare_fd < 0) |
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{ |
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ilog(L_NOTICE, "Failed to reserve low fd for %s - open failed", spare_purpose); |
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return -1; |
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} |
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else if (spare_fd > 255) |
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{ |
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ilog(L_NOTICE, "Failed to reserve low fd for %s - too high", spare_purpose); |
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close(spare_fd); |
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return -1; |
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} |
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return spare_fd; |
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} |