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/* re.c: This file contains the regular expression interface routines for
the ed line editor. */
/* ed line editor.
Copyright (C) 1993, 1994 Andrew Moore, Talke Studio
All Rights Reserved
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef lint
static char *rcsid = "@(#)$Id: re.c,v 1.7 1994/11/13 04:25:44 alm Exp $";
#endif /* not lint */
#include "ed.h"
extern int patlock;
/* get_compiled_pattern: return pointer to compiled pattern from command
buffer */
pattern_t *
get_compiled_pattern ()
{
static pattern_t *exp = NULL;
char *exps;
char delimiter;
int n;
if ((delimiter = *ibufp) == ' ')
{
sprintf (errmsg, "Invalid pattern delimiter");
return NULL;
}
else if (delimiter == '\n' || *++ibufp == '\n' || *ibufp == delimiter)
{
if (!exp)
sprintf (errmsg, "No previous pattern");
return exp;
}
else if ((exps = extract_pattern (delimiter)) == NULL)
return NULL;
/* buffer alloc'd && not reserved */
if (exp && !patlock)
regfree (exp);
else if ((exp = (pattern_t *) malloc (sizeof (pattern_t))) == NULL)
{
fprintf (stderr, "%s\n", strerror (errno));
sprintf (errmsg, "Out of memory");
return NULL;
}
patlock = 0;
if ((n = regcomp (exp, exps, 0)))
{
regerror (n, exp, errmsg, ERRSZ);
free (exp);
return exp = NULL;
}
return exp;
}
/* extract_pattern: copy a pattern string from the command buffer; return
pointer to the copy */
char *
extract_pattern (delimiter)
int delimiter;
{
static char *lhbuf = NULL; /* buffer */
static int lhbufsz = 0; /* buffer size */
char *nd;
int len;
for (nd = ibufp; *nd != delimiter && *nd != '\n'; nd++)
switch (*nd)
{
default:
break;
case '[':
if ((nd = parse_char_class (++nd)) == NULL)
{
sprintf (errmsg, "Unbalanced brackets ([])");
return NULL;
}
break;
case '\\':
if (*++nd == '\n')
{
sprintf (errmsg, "Trailing backslash (\\)");
return NULL;
}
break;
}
len = nd - ibufp;
REALLOC (lhbuf, lhbufsz, len + 1, NULL);
memcpy (lhbuf, ibufp, len);
lhbuf[len] = '\0';
ibufp = nd;
return (isbinary) ? NUL_TO_NEWLINE (lhbuf, len) : lhbuf;
}
/* parse_char_class: expand a POSIX character class */
char *
parse_char_class (s)
char *s;
{
int c, d;
if (*s == '^')
s++;
if (*s == ']')
s++;
for (; *s != ']' && *s != '\n'; s++)
if (*s == '[' && ((d = *(s + 1)) == '.' || d == ':' || d == '='))
for (s++, c = *++s; *s != ']' || c != d; s++)
if ((c = *s) == '\n')
return NULL;
return (*s == ']') ? s : NULL;
}
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