214 lines
5.5 KiB
C
214 lines
5.5 KiB
C
/*-
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* Copyright (c) 1991, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)util.c 8.74 (Berkeley) 8/17/94";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/queue.h>
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#include <sys/time.h>
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#include <bitstring.h>
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#include <limits.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <termios.h>
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#include <unistd.h>
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#include "compat.h"
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#include <curses.h>
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#include <db.h>
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#include <regex.h>
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#include "vi.h"
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/*
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* binc --
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* Increase the size of a buffer.
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*/
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void *
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binc(sp, bp, bsizep, min)
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SCR *sp; /* sp MAY BE NULL!!! */
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void *bp;
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size_t *bsizep, min;
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{
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size_t csize;
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/* If already larger than the minimum, just return. */
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if (min && *bsizep >= min)
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return (bp);
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csize = *bsizep + MAX(min, 256);
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REALLOC(sp, bp, void *, csize);
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if (bp == NULL) {
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/*
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* Theoretically, realloc is supposed to leave any already
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* held memory alone if it can't get more. Don't trust it.
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*/
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*bsizep = 0;
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return (NULL);
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}
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/*
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* Memory is guaranteed to be zero-filled, various parts of
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* nvi depend on this.
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*/
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memset((char *)bp + *bsizep, 0, csize - *bsizep);
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*bsizep = csize;
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return (bp);
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}
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/*
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* nonblank --
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* Set the column number of the first non-blank character
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* including or after the starting column. On error, set
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* the column to 0, it's safest.
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*/
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int
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nonblank(sp, ep, lno, cnop)
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SCR *sp;
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EXF *ep;
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recno_t lno;
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size_t *cnop;
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{
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char *p;
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size_t cnt, len, off;
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/* Default. */
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off = *cnop;
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*cnop = 0;
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/* Get the line. */
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if ((p = file_gline(sp, ep, lno, &len)) == NULL) {
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if (file_lline(sp, ep, &lno))
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return (1);
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if (lno == 0)
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return (0);
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GETLINE_ERR(sp, lno);
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return (1);
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}
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/* Set the offset. */
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if (len == 0 || off >= len)
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return (0);
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for (cnt = off, p = &p[off],
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len -= off; len && isblank(*p); ++cnt, ++p, --len);
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/* Set the return. */
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*cnop = len ? cnt : cnt - 1;
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return (0);
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}
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/*
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* tail --
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* Return tail of a path.
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*/
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char *
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tail(path)
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char *path;
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{
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char *p;
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if ((p = strrchr(path, '/')) == NULL)
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return (path);
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return (p + 1);
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}
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/*
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* set_alt_name --
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* Set the alternate file name.
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*
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* Swap the alternate file name. It's a routine because I wanted some place
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* to hang this comment. The alternate file name (normally referenced using
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* the special character '#' during file expansion) is set by many
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* operations. In the historic vi, the commands "ex", and "edit" obviously
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* set the alternate file name because they switched the underlying file.
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* Less obviously, the "read", "file", "write" and "wq" commands set it as
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* well. In this implementation, some new commands have been added to the
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* list. Where it gets interesting is that the alternate file name is set
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* multiple times by some commands. If an edit attempt fails (for whatever
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* reason, like the current file is modified but as yet unwritten), it is
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* set to the file name that the user was unable to edit. If the edit
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* succeeds, it is set to the last file name that was edited. Good fun.
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*
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* If the user edits a temporary file, there are time when there isn't an
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* alternative file name. A name argument of NULL turns it off.
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*/
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void
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set_alt_name(sp, name)
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SCR *sp;
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char *name;
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{
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if (sp->alt_name != NULL)
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free(sp->alt_name);
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if (name == NULL)
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sp->alt_name = NULL;
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else if ((sp->alt_name = strdup(name)) == NULL)
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msgq(sp, M_SYSERR, NULL);
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}
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/*
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* v_strdup --
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* Strdup for wide character strings with an associated length.
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*/
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CHAR_T *
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v_strdup(sp, str, len)
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SCR *sp;
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CHAR_T *str;
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size_t len;
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{
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CHAR_T *copy;
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MALLOC(sp, copy, CHAR_T *, len + 1);
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if (copy == NULL)
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return (NULL);
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memmove(copy, str, len * sizeof(CHAR_T));
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copy[len] = '\0';
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return (copy);
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}
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/*
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* vi_putchar --
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* Functional version of putchar, for tputs.
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*/
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void
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vi_putchar(ch)
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int ch;
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{
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(void)putchar(ch);
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}
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