nl_unix.c
上传用户:ycwykj01
上传日期:2007-01-04
资源大小:1819k
文件大小:3k
- /*
- * Program: UNIX/VMS newline routines
- *
- * Author: Mark Crispin
- * Networks and Distributed Computing
- * Computing & Communications
- * University of Washington
- * Administration Building, AG-44
- * Seattle, WA 98195
- * Internet: MRC@CAC.Washington.EDU
- *
- * Date: 1 August 1988
- * Last Edited: 30 August 1999
- *
- * Copyright 1999 by the University of Washington
- *
- * Permission to use, copy, modify, and distribute this software and its
- * documentation for any purpose and without fee is hereby granted, provided
- * that the above copyright notice appears in all copies and that both the
- * above copyright notice and this permission notice appear in supporting
- * documentation, and that the name of the University of Washington not be
- * used in advertising or publicity pertaining to distribution of the software
- * without specific, written prior permission. This software is made available
- * "as is", and
- * THE UNIVERSITY OF WASHINGTON DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED,
- * WITH REGARD TO THIS SOFTWARE, INCLUDING WITHOUT LIMITATION ALL IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND IN
- * NO EVENT SHALL THE UNIVERSITY OF WASHINGTON BE LIABLE FOR ANY SPECIAL,
- * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
- * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, TORT
- * (INCLUDING NEGLIGENCE) OR STRICT LIABILITY, ARISING OUT OF OR IN CONNECTION
- * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- */
- /* Copy string with CRLF newlines
- * Accepts: destination string
- * pointer to size of destination string buffer
- * source string
- * length of source string
- * Returns: length of copied string
- */
- unsigned long strcrlfcpy (char **dst,unsigned long *dstl,char *src,
- unsigned long srcl)
- {
- long i = srcl * 2,j;
- char c,*d = src;
- if (*dst) { /* candidate destination provided? */
- /* count NLs if doesn't fit worst-case */
- if (i > *dstl) for (i = j = srcl; j; --j) if (*d++ == ' 12') i++;
- /* still too small, must reset destination */
- if (i > *dstl) fs_give ((void **) dst);
- }
- /* make a new buffer if needed */
- if (!*dst) *dst = (char *) fs_get ((*dstl = i) + 1);
- d = *dst; /* destination string */
- if (srcl) do { /* main copy loop */
- if ((c = *src++) < ' 16') {
- /* prepend CR to LF */
- if (c == ' 12') *d++ = ' 15';
- /* unlikely CR */
- else if ((c == ' 15') && (srcl > 1) && (*src == ' 12')) {
- *d++ = c; /* copy the CR */
- c = *src++; /* grab the LF */
- --srcl; /* adjust the count */
- }
- }
- *d++ = c; /* copy character */
- } while (--srcl);
- *d = ' '; /* tie off destination */
- return d - *dst; /* return length */
- }
- /* Length of string after strcrlfcpy applied
- * Accepts: source string
- * Returns: length of string
- */
- unsigned long strcrlflen (STRING *s)
- {
- unsigned long pos = GETPOS (s);
- unsigned long i = SIZE (s);
- unsigned long j = i;
- while (j--) switch (SNX (s)) {/* search for newlines */
- case ' 15': /* unlikely carriage return */
- if (j && (CHR (s) == ' 12')) {
- SNX (s); /* eat the line feed */
- j--;
- }
- break;
- case ' 12': /* line feed? */
- i++;
- default: /* ordinary chararacter */
- break;
- }
- SETPOS (s,pos); /* restore old position */
- return i;
- }