399 lines
8.6 KiB
C
399 lines
8.6 KiB
C
/* $NetBSD: tokenizer.c,v 1.7 2001/01/04 15:56:32 christos Exp $ */
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/*-
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Christos Zoulas of Cornell University.
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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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#include <sys/cdefs.h>
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#if !defined(lint) && !defined(SCCSID)
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#if 0
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static char sccsid[] = "@(#)tokenizer.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: tokenizer.c,v 1.7 2001/01/04 15:56:32 christos Exp $");
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#endif
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#endif /* not lint && not SCCSID */
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/*
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* tokenize.c: Bourne shell like tokenizer
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*/
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#include "sys.h"
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#include <string.h>
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#include <stdlib.h>
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#include "tokenizer.h"
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typedef enum {
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Q_none, Q_single, Q_double, Q_one, Q_doubleone
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} quote_t;
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#define IFS "\t \n"
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#define TOK_KEEP 1
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#define TOK_EAT 2
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#define WINCR 20
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#define AINCR 10
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#define tok_malloc(a) malloc(a)
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#define tok_free(a) free(a)
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#define tok_realloc(a, b) realloc(a, b)
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struct tokenizer {
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char *ifs; /* In field separator */
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int argc, amax; /* Current and maximum number of args */
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char **argv; /* Argument list */
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char *wptr, *wmax; /* Space and limit on the word buffer */
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char *wstart; /* Beginning of next word */
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char *wspace; /* Space of word buffer */
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quote_t quote; /* Quoting state */
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int flags; /* flags; */
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};
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private void tok_finish(Tokenizer *);
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/* tok_finish():
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* Finish a word in the tokenizer.
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*/
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private void
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tok_finish(Tokenizer *tok)
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{
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*tok->wptr = '\0';
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if ((tok->flags & TOK_KEEP) || tok->wptr != tok->wstart) {
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tok->argv[tok->argc++] = tok->wstart;
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tok->argv[tok->argc] = NULL;
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tok->wstart = ++tok->wptr;
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}
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tok->flags &= ~TOK_KEEP;
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}
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/* tok_init():
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* Initialize the tokenizer
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*/
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public Tokenizer *
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tok_init(const char *ifs)
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{
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Tokenizer *tok = (Tokenizer *) tok_malloc(sizeof(Tokenizer));
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tok->ifs = strdup(ifs ? ifs : IFS);
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tok->argc = 0;
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tok->amax = AINCR;
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tok->argv = (char **) tok_malloc(sizeof(char *) * tok->amax);
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if (tok->argv == NULL)
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return (NULL);
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tok->argv[0] = NULL;
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tok->wspace = (char *) tok_malloc(WINCR);
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if (tok->wspace == NULL)
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return (NULL);
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tok->wmax = tok->wspace + WINCR;
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tok->wstart = tok->wspace;
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tok->wptr = tok->wspace;
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tok->flags = 0;
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tok->quote = Q_none;
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return (tok);
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}
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/* tok_reset():
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* Reset the tokenizer
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*/
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public void
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tok_reset(Tokenizer *tok)
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{
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tok->argc = 0;
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tok->wstart = tok->wspace;
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tok->wptr = tok->wspace;
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tok->flags = 0;
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tok->quote = Q_none;
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}
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/* tok_end():
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* Clean up
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*/
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public void
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tok_end(Tokenizer *tok)
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{
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tok_free((ptr_t) tok->ifs);
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tok_free((ptr_t) tok->wspace);
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tok_free((ptr_t) tok->argv);
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tok_free((ptr_t) tok);
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}
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/* tok_line():
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* Bourne shell like tokenizing
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* Return:
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* -1: Internal error
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* 3: Quoted return
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* 2: Unmatched double quote
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* 1: Unmatched single quote
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* 0: Ok
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*/
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public int
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tok_line(Tokenizer *tok, const char *line, int *argc, char ***argv)
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{
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const char *ptr;
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for (;;) {
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switch (*(ptr = line++)) {
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case '\'':
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tok->flags |= TOK_KEEP;
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tok->flags &= ~TOK_EAT;
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switch (tok->quote) {
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case Q_none:
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tok->quote = Q_single; /* Enter single quote
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* mode */
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break;
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case Q_single: /* Exit single quote mode */
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tok->quote = Q_none;
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break;
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case Q_one: /* Quote this ' */
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tok->quote = Q_none;
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*tok->wptr++ = *ptr;
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break;
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case Q_double: /* Stay in double quote mode */
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*tok->wptr++ = *ptr;
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break;
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case Q_doubleone: /* Quote this ' */
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tok->quote = Q_double;
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*tok->wptr++ = *ptr;
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break;
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default:
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return (-1);
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}
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break;
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case '"':
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tok->flags &= ~TOK_EAT;
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tok->flags |= TOK_KEEP;
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switch (tok->quote) {
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case Q_none: /* Enter double quote mode */
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tok->quote = Q_double;
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break;
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case Q_double: /* Exit double quote mode */
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tok->quote = Q_none;
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break;
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case Q_one: /* Quote this " */
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tok->quote = Q_none;
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*tok->wptr++ = *ptr;
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break;
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case Q_single: /* Stay in single quote mode */
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*tok->wptr++ = *ptr;
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break;
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case Q_doubleone: /* Quote this " */
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tok->quote = Q_double;
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*tok->wptr++ = *ptr;
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break;
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default:
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return (-1);
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}
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break;
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case '\\':
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tok->flags |= TOK_KEEP;
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tok->flags &= ~TOK_EAT;
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switch (tok->quote) {
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case Q_none: /* Quote next character */
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tok->quote = Q_one;
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break;
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case Q_double: /* Quote next character */
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tok->quote = Q_doubleone;
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break;
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case Q_one: /* Quote this, restore state */
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*tok->wptr++ = *ptr;
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tok->quote = Q_none;
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break;
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case Q_single: /* Stay in single quote mode */
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*tok->wptr++ = *ptr;
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break;
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case Q_doubleone: /* Quote this \ */
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tok->quote = Q_double;
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*tok->wptr++ = *ptr;
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break;
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default:
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return (-1);
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}
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break;
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case '\n':
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tok->flags &= ~TOK_EAT;
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switch (tok->quote) {
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case Q_none:
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tok_finish(tok);
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*argv = tok->argv;
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*argc = tok->argc;
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return (0);
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case Q_single:
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case Q_double:
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*tok->wptr++ = *ptr; /* Add the return */
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break;
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case Q_doubleone: /* Back to double, eat the '\n' */
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tok->flags |= TOK_EAT;
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tok->quote = Q_double;
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break;
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case Q_one: /* No quote, more eat the '\n' */
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tok->flags |= TOK_EAT;
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tok->quote = Q_none;
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break;
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default:
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return (0);
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}
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break;
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case '\0':
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switch (tok->quote) {
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case Q_none:
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/* Finish word and return */
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if (tok->flags & TOK_EAT) {
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tok->flags &= ~TOK_EAT;
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return (3);
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}
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tok_finish(tok);
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*argv = tok->argv;
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*argc = tok->argc;
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return (0);
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case Q_single:
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return (1);
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case Q_double:
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return (2);
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case Q_doubleone:
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tok->quote = Q_double;
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*tok->wptr++ = *ptr;
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break;
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case Q_one:
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tok->quote = Q_none;
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*tok->wptr++ = *ptr;
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break;
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default:
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return (-1);
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}
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break;
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default:
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tok->flags &= ~TOK_EAT;
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switch (tok->quote) {
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case Q_none:
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if (strchr(tok->ifs, *ptr) != NULL)
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tok_finish(tok);
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else
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*tok->wptr++ = *ptr;
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break;
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case Q_single:
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case Q_double:
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*tok->wptr++ = *ptr;
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break;
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case Q_doubleone:
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*tok->wptr++ = '\\';
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tok->quote = Q_double;
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*tok->wptr++ = *ptr;
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break;
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case Q_one:
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tok->quote = Q_none;
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*tok->wptr++ = *ptr;
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break;
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default:
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return (-1);
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}
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break;
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}
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if (tok->wptr >= tok->wmax - 4) {
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size_t size = tok->wmax - tok->wspace + WINCR;
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char *s = (char *) tok_realloc(tok->wspace, size);
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/* SUPPRESS 22 */
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int offs = s - tok->wspace;
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if (s == NULL)
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return (-1);
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if (offs != 0) {
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int i;
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for (i = 0; i < tok->argc; i++)
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tok->argv[i] = tok->argv[i] + offs;
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tok->wptr = tok->wptr + offs;
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tok->wstart = tok->wstart + offs;
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tok->wmax = s + size;
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tok->wspace = s;
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}
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}
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if (tok->argc >= tok->amax - 4) {
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char **p;
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tok->amax += AINCR;
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p = (char **) tok_realloc(tok->argv,
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tok->amax * sizeof(char *));
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if (p == NULL)
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return (-1);
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tok->argv = p;
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}
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}
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}
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