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Diffstat (limited to 'contrib/sendmail/libsm/ungetc.c')
| -rw-r--r-- | contrib/sendmail/libsm/ungetc.c | 179 |
1 files changed, 0 insertions, 179 deletions
diff --git a/contrib/sendmail/libsm/ungetc.c b/contrib/sendmail/libsm/ungetc.c deleted file mode 100644 index 7794af077a926..0000000000000 --- a/contrib/sendmail/libsm/ungetc.c +++ /dev/null @@ -1,179 +0,0 @@ -/* - * Copyright (c) 2000-2001 Sendmail, Inc. and its suppliers. - * All rights reserved. - * Copyright (c) 1990, 1993 - * The Regents of the University of California. All rights reserved. - * - * This code is derived from software contributed to Berkeley by - * Chris Torek. - * - * By using this file, you agree to the terms and conditions set - * forth in the LICENSE file which can be found at the top level of - * the sendmail distribution. - */ - -#include <sm/gen.h> -SM_IDSTR(id, "@(#)$Id: ungetc.c,v 1.28 2001/09/11 04:04:49 gshapiro Exp $") - -#include <stdlib.h> -#include <string.h> -#include <signal.h> -#include <sys/time.h> -#include <errno.h> -#include <sm/io.h> -#include <sm/heap.h> -#include <sm/assert.h> -#include <sm/conf.h> -#include "local.h" - -/* -** SM_SUBMORE_X -- expand ungetc buffer -** -** Expand the ungetc buffer `in place'. That is, adjust fp->f_p when -** the buffer moves, so that it points the same distance from the end, -** and move the bytes in the buffer around as necessary so that they -** are all at the end (stack-style). -** -** Parameters: -** fp -- the file pointer -** -** Results: -** none. -** -** Exceptions: -** F:sm_heap -- out of memory -*/ - -static void -sm_submore_x(fp) - register SM_FILE_T *fp; -{ - register int i; - register unsigned char *p; - - if (fp->f_ub.smb_base == fp->f_ubuf) - { - /* Get a buffer; f_ubuf is fixed size. */ - p = sm_malloc_x((size_t) SM_IO_BUFSIZ); - fp->f_ub.smb_base = p; - fp->f_ub.smb_size = SM_IO_BUFSIZ; - p += SM_IO_BUFSIZ - sizeof(fp->f_ubuf); - for (i = sizeof(fp->f_ubuf); --i >= 0;) - p[i] = fp->f_ubuf[i]; - fp->f_p = p; - return; - } - i = fp->f_ub.smb_size; - p = sm_realloc_x(fp->f_ub.smb_base, i << 1); - - /* no overlap (hence can use memcpy) because we doubled the size */ - (void) memcpy((void *) (p + i), (void *) p, (size_t) i); - fp->f_p = p + i; - fp->f_ub.smb_base = p; - fp->f_ub.smb_size = i << 1; -} - -/* -** SM_IO_UNGETC -- place a character back into the buffer just read -** -** Parameters: -** fp -- the file pointer affected -** timeout -- time to complete ungetc -** c -- the character to place back -** -** Results: -** On success, returns value of character placed back, 0-255. -** Returns SM_IO_EOF if c == SM_IO_EOF or if last operation -** was a write and flush failed. -** -** Exceptions: -** F:sm_heap -- out of memory -*/ - -int -sm_io_ungetc(fp, timeout, c) - register SM_FILE_T *fp; - int timeout; - int c; -{ - SM_REQUIRE_ISA(fp, SmFileMagic); - if (c == SM_IO_EOF) - return SM_IO_EOF; - if (timeout == SM_TIME_IMMEDIATE) - { - /* - ** Ungetting the buffer will take time and we are wanted to - ** return immediately. So... - */ - - errno = EAGAIN; - return SM_IO_EOF; - } - - if (!Sm_IO_DidInit) - sm_init(); - if ((fp->f_flags & SMRD) == 0) - { - /* - ** Not already reading: no good unless reading-and-writing. - ** Otherwise, flush any current write stuff. - */ - - if ((fp->f_flags & SMRW) == 0) - return SM_IO_EOF; - if (fp->f_flags & SMWR) - { - if (sm_flush(fp, &timeout)) - return SM_IO_EOF; - fp->f_flags &= ~SMWR; - fp->f_w = 0; - fp->f_lbfsize = 0; - } - fp->f_flags |= SMRD; - } - c = (unsigned char) c; - - /* - ** If we are in the middle of ungetc'ing, just continue. - ** This may require expanding the current ungetc buffer. - */ - - if (HASUB(fp)) - { - if (fp->f_r >= fp->f_ub.smb_size) - sm_submore_x(fp); - *--fp->f_p = c; - fp->f_r++; - return c; - } - fp->f_flags &= ~SMFEOF; - - /* - ** If we can handle this by simply backing up, do so, - ** but never replace the original character. - ** (This makes sscanf() work when scanning `const' data.) - */ - - if (fp->f_bf.smb_base != NULL && fp->f_p > fp->f_bf.smb_base && - fp->f_p[-1] == c) - { - fp->f_p--; - fp->f_r++; - return c; - } - - /* - ** Create an ungetc buffer. - ** Initially, we will use the `reserve' buffer. - */ - - fp->f_ur = fp->f_r; - fp->f_up = fp->f_p; - fp->f_ub.smb_base = fp->f_ubuf; - fp->f_ub.smb_size = sizeof(fp->f_ubuf); - fp->f_ubuf[sizeof(fp->f_ubuf) - 1] = c; - fp->f_p = &fp->f_ubuf[sizeof(fp->f_ubuf) - 1]; - fp->f_r = 1; - - return c; -} |