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128 lines
3.5 KiB
C
128 lines
3.5 KiB
C
/* re.c: This file contains the regular expression interface routines for
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the ed line editor. */
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/*-
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* Copyright (c) 1993 Andrew Moore, Talke Studio.
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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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#include <sys/cdefs.h>
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#include "ed.h"
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const char *errmsg = "";
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/* get_compiled_pattern: return pointer to compiled pattern from command
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buffer */
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pattern_t *
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get_compiled_pattern(void)
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{
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static pattern_t *expr = NULL;
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static char error[1024];
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char *exprs;
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char delimiter;
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int n;
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if ((delimiter = *ibufp) == ' ') {
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errmsg = "invalid pattern delimiter";
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return NULL;
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} else if (delimiter == '\n' || *++ibufp == '\n' || *ibufp == delimiter) {
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if (!expr)
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errmsg = "no previous pattern";
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return expr;
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} else if ((exprs = extract_pattern(delimiter)) == NULL)
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return NULL;
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/* buffer alloc'd && not reserved */
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if (expr && !patlock)
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regfree(expr);
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else if ((expr = (pattern_t *) malloc(sizeof(pattern_t))) == NULL) {
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fprintf(stderr, "%s\n", strerror(errno));
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errmsg = "out of memory";
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return NULL;
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}
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patlock = 0;
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if ((n = regcomp(expr, exprs, 0))) {
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regerror(n, expr, error, sizeof error);
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errmsg = error;
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free(expr);
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return expr = NULL;
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}
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return expr;
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}
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/* extract_pattern: copy a pattern string from the command buffer; return
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pointer to the copy */
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char *
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extract_pattern(int delimiter)
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{
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static char *lhbuf = NULL; /* buffer */
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static int lhbufsz = 0; /* buffer size */
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char *nd;
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int len;
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for (nd = ibufp; *nd != delimiter && *nd != '\n'; nd++)
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switch (*nd) {
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default:
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break;
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case '[':
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if ((nd = parse_char_class(nd + 1)) == NULL) {
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errmsg = "unbalanced brackets ([])";
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return NULL;
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}
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break;
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case '\\':
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if (*++nd == '\n') {
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errmsg = "trailing backslash (\\)";
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return NULL;
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}
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break;
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}
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len = nd - ibufp;
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REALLOC(lhbuf, lhbufsz, len + 1, NULL);
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memcpy(lhbuf, ibufp, len);
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lhbuf[len] = '\0';
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ibufp = nd;
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return (isbinary) ? NUL_TO_NEWLINE(lhbuf, len) : lhbuf;
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}
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/* parse_char_class: expand a POSIX character class */
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char *
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parse_char_class(char *s)
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{
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int c, d;
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if (*s == '^')
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s++;
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if (*s == ']')
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s++;
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for (; *s != ']' && *s != '\n'; s++)
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if (*s == '[' && ((d = *(s+1)) == '.' || d == ':' || d == '='))
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for (s++, c = *++s; *s != ']' || c != d; s++)
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if ((c = *s) == '\n')
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return NULL;
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return (*s == ']') ? s : NULL;
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}
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