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-rw-r--r--cmd-line-utils/libedit/tokenizer.c391
1 files changed, 391 insertions, 0 deletions
diff --git a/cmd-line-utils/libedit/tokenizer.c b/cmd-line-utils/libedit/tokenizer.c
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+/* $NetBSD: tokenizer.c,v 1.7 2001/01/04 15:56:32 christos Exp $ */
+
+/*-
+ * Copyright (c) 1992, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Christos Zoulas of Cornell University.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "compat.h"
+
+/*
+ * tokenize.c: Bourne shell like tokenizer
+ */
+#include "sys.h"
+#include <string.h>
+#include <stdlib.h>
+#include "tokenizer.h"
+
+typedef enum {
+ Q_none, Q_single, Q_double, Q_one, Q_doubleone
+} quote_t;
+
+#define IFS "\t \n"
+
+#define TOK_KEEP 1
+#define TOK_EAT 2
+
+#define WINCR 20
+#define AINCR 10
+
+#define tok_malloc(a) malloc(a)
+#define tok_free(a) free(a)
+#define tok_realloc(a, b) realloc(a, b)
+
+
+struct tokenizer {
+ char *ifs; /* In field separator */
+ int argc, amax; /* Current and maximum number of args */
+ const char **argv; /* Argument list */
+ char *wptr, *wmax; /* Space and limit on the word buffer */
+ char *wstart; /* Beginning of next word */
+ char *wspace; /* Space of word buffer */
+ quote_t quote; /* Quoting state */
+ int flags; /* flags; */
+};
+
+
+private void tok_finish(Tokenizer *);
+
+
+/* tok_finish():
+ * Finish a word in the tokenizer.
+ */
+private void
+tok_finish(Tokenizer *tok)
+{
+
+ *tok->wptr = '\0';
+ if ((tok->flags & TOK_KEEP) || tok->wptr != tok->wstart) {
+ tok->argv[tok->argc++] = tok->wstart;
+ tok->argv[tok->argc] = NULL;
+ tok->wstart = ++tok->wptr;
+ }
+ tok->flags &= ~TOK_KEEP;
+}
+
+
+/* tok_init():
+ * Initialize the tokenizer
+ */
+public Tokenizer *
+tok_init(const char *ifs)
+{
+ Tokenizer *tok = (Tokenizer *) tok_malloc(sizeof(Tokenizer));
+
+ tok->ifs = strdup(ifs ? ifs : IFS);
+ tok->argc = 0;
+ tok->amax = AINCR;
+ tok->argv = (const char **) tok_malloc(sizeof(char *) * tok->amax);
+ if (tok->argv == NULL)
+ return (NULL);
+ tok->argv[0] = NULL;
+ tok->wspace = (char *) tok_malloc(WINCR);
+ if (tok->wspace == NULL)
+ return (NULL);
+ tok->wmax = tok->wspace + WINCR;
+ tok->wstart = tok->wspace;
+ tok->wptr = tok->wspace;
+ tok->flags = 0;
+ tok->quote = Q_none;
+
+ return (tok);
+}
+
+
+/* tok_reset():
+ * Reset the tokenizer
+ */
+public void
+tok_reset(Tokenizer *tok)
+{
+
+ tok->argc = 0;
+ tok->wstart = tok->wspace;
+ tok->wptr = tok->wspace;
+ tok->flags = 0;
+ tok->quote = Q_none;
+}
+
+
+/* tok_end():
+ * Clean up
+ */
+public void
+tok_end(Tokenizer *tok)
+{
+
+ tok_free((ptr_t) tok->ifs);
+ tok_free((ptr_t) tok->wspace);
+ tok_free((ptr_t) tok->argv);
+ tok_free((ptr_t) tok);
+}
+
+
+
+/* tok_line():
+ * Bourne shell like tokenizing
+ * Return:
+ * -1: Internal error
+ * 3: Quoted return
+ * 2: Unmatched double quote
+ * 1: Unmatched single quote
+ * 0: Ok
+ */
+public int
+tok_line(Tokenizer *tok, const char *line, int *argc, const char ***argv)
+{
+ const char *ptr;
+
+ for (;;) {
+ switch (*(ptr = line++)) {
+ case '\'':
+ tok->flags |= TOK_KEEP;
+ tok->flags &= ~TOK_EAT;
+ switch (tok->quote) {
+ case Q_none:
+ tok->quote = Q_single; /* Enter single quote
+ * mode */
+ break;
+
+ case Q_single: /* Exit single quote mode */
+ tok->quote = Q_none;
+ break;
+
+ case Q_one: /* Quote this ' */
+ tok->quote = Q_none;
+ *tok->wptr++ = *ptr;
+ break;
+
+ case Q_double: /* Stay in double quote mode */
+ *tok->wptr++ = *ptr;
+ break;
+
+ case Q_doubleone: /* Quote this ' */
+ tok->quote = Q_double;
+ *tok->wptr++ = *ptr;
+ break;
+
+ default:
+ return (-1);
+ }
+ break;
+
+ case '"':
+ tok->flags &= ~TOK_EAT;
+ tok->flags |= TOK_KEEP;
+ switch (tok->quote) {
+ case Q_none: /* Enter double quote mode */
+ tok->quote = Q_double;
+ break;
+
+ case Q_double: /* Exit double quote mode */
+ tok->quote = Q_none;
+ break;
+
+ case Q_one: /* Quote this " */
+ tok->quote = Q_none;
+ *tok->wptr++ = *ptr;
+ break;
+
+ case Q_single: /* Stay in single quote mode */
+ *tok->wptr++ = *ptr;
+ break;
+
+ case Q_doubleone: /* Quote this " */
+ tok->quote = Q_double;
+ *tok->wptr++ = *ptr;
+ break;
+
+ default:
+ return (-1);
+ }
+ break;
+
+ case '\\':
+ tok->flags |= TOK_KEEP;
+ tok->flags &= ~TOK_EAT;
+ switch (tok->quote) {
+ case Q_none: /* Quote next character */
+ tok->quote = Q_one;
+ break;
+
+ case Q_double: /* Quote next character */
+ tok->quote = Q_doubleone;
+ break;
+
+ case Q_one: /* Quote this, restore state */
+ *tok->wptr++ = *ptr;
+ tok->quote = Q_none;
+ break;
+
+ case Q_single: /* Stay in single quote mode */
+ *tok->wptr++ = *ptr;
+ break;
+
+ case Q_doubleone: /* Quote this \ */
+ tok->quote = Q_double;
+ *tok->wptr++ = *ptr;
+ break;
+
+ default:
+ return (-1);
+ }
+ break;
+
+ case '\n':
+ tok->flags &= ~TOK_EAT;
+ switch (tok->quote) {
+ case Q_none:
+ tok_finish(tok);
+ *argv = tok->argv;
+ *argc = tok->argc;
+ return (0);
+
+ case Q_single:
+ case Q_double:
+ *tok->wptr++ = *ptr; /* Add the return */
+ break;
+
+ case Q_doubleone: /* Back to double, eat the '\n' */
+ tok->flags |= TOK_EAT;
+ tok->quote = Q_double;
+ break;
+
+ case Q_one: /* No quote, more eat the '\n' */
+ tok->flags |= TOK_EAT;
+ tok->quote = Q_none;
+ break;
+
+ default:
+ return (0);
+ }
+ break;
+
+ case '\0':
+ switch (tok->quote) {
+ case Q_none:
+ /* Finish word and return */
+ if (tok->flags & TOK_EAT) {
+ tok->flags &= ~TOK_EAT;
+ return (3);
+ }
+ tok_finish(tok);
+ *argv = tok->argv;
+ *argc = tok->argc;
+ return (0);
+
+ case Q_single:
+ return (1);
+
+ case Q_double:
+ return (2);
+
+ case Q_doubleone:
+ tok->quote = Q_double;
+ *tok->wptr++ = *ptr;
+ break;
+
+ case Q_one:
+ tok->quote = Q_none;
+ *tok->wptr++ = *ptr;
+ break;
+
+ default:
+ return (-1);
+ }
+ break;
+
+ default:
+ tok->flags &= ~TOK_EAT;
+ switch (tok->quote) {
+ case Q_none:
+ if (strchr(tok->ifs, *ptr) != NULL)
+ tok_finish(tok);
+ else
+ *tok->wptr++ = *ptr;
+ break;
+
+ case Q_single:
+ case Q_double:
+ *tok->wptr++ = *ptr;
+ break;
+
+
+ case Q_doubleone:
+ *tok->wptr++ = '\\';
+ tok->quote = Q_double;
+ *tok->wptr++ = *ptr;
+ break;
+
+ case Q_one:
+ tok->quote = Q_none;
+ *tok->wptr++ = *ptr;
+ break;
+
+ default:
+ return (-1);
+
+ }
+ break;
+ }
+
+ if (tok->wptr >= tok->wmax - 4) {
+ size_t size = tok->wmax - tok->wspace + WINCR;
+ char *s = (char *) tok_realloc(tok->wspace, size);
+ /* SUPPRESS 22 */
+ int offs = s - tok->wspace;
+ if (s == NULL)
+ return (-1);
+
+ if (offs != 0) {
+ int i;
+ for (i = 0; i < tok->argc; i++)
+ tok->argv[i] = tok->argv[i] + offs;
+ tok->wptr = tok->wptr + offs;
+ tok->wstart = tok->wstart + offs;
+ tok->wmax = s + size;
+ tok->wspace = s;
+ }
+ }
+ if (tok->argc >= tok->amax - 4) {
+ const char **p;
+ tok->amax += AINCR;
+ p = (const char **) tok_realloc(tok->argv,
+ tok->amax * sizeof(char *));
+ if (p == NULL)
+ return (-1);
+ tok->argv = p;
+ }
+ }
+}
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