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nl_unix.c
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C/C++ Source or Header
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1994-10-09
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3KB
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106 lines
/*
* 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: 9 October 1994
*
* Copyright 1994 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 (dst,dstl,src,srcl)
char **dst;
unsigned long *dstl;
char *src;
unsigned long srcl;
{
long i,j;
char *d = src;
/* count number of LF's in source string(s) */
for (i = srcl,j = 0; j < srcl; j++) if (*d++ == '\012') i++;
/* flush destination buffer if too small */
if (*dst && (i > *dstl)) fs_give ((void **) dst);
if (!*dst) { /* make a new buffer if needed */
*dst = (char *) fs_get ((*dstl = i) + 1);
if (dstl) *dstl = i; /* return new buffer length to main program */
}
d = *dst; /* destination string */
/* copy strings, inserting CR's before LF's */
while (srcl--) switch (*src) {
case '\015': /* unlikely carriage return */
*d++ = *src++; /* copy it and any succeeding linefeed */
if (srcl && *src == '\012') {
*d++ = *src++;
srcl--;
}
break;
case '\012': /* line feed? */
*d++ ='\015'; /* yes, prepend a CR, drop into default case */
default: /* ordinary chararacter */
*d++ = *src++; /* just copy character */
break;
}
*d = '\0'; /* tie off destination */
return d - *dst; /* return length */
}
/* Length of string after strcrlfcpy applied
* Accepts: source string
* Returns: length of string
*/
unsigned long strcrlflen (s)
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 '\015': /* unlikely carriage return */
if (j && (CHR (s) == '\012')) {
SNX (s); /* eat the line feed */
j--;
}
break;
case '\012': /* line feed? */
i++;
default: /* ordinary chararacter */
break;
}
SETPOS (s,pos); /* restore old position */
return i;
}