4.4BSD/usr/src/lib/libedit/tokenizer.c
/*-
* 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.
*/
#if !defined(lint) && !defined(SCCSID)
static char sccsid[] = "@(#)tokenizer.c 8.1 (Berkeley) 6/4/93";
#endif /* not lint && not SCCSID */
/*
* 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 */
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 __P((Tokenizer *));
/* tok_finish():
* Finish a word in the tokenizer.
*/
private void
tok_finish(tok)
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(ifs)
const char *ifs;
{
Tokenizer* tok = (Tokenizer*) tok_malloc(sizeof(Tokenizer));
tok->ifs = strdup(ifs ? ifs : IFS);
tok->argc = 0;
tok->amax = AINCR;
tok->argv = (char **) tok_malloc(sizeof(char *) * tok->amax);
tok->argv[0] = NULL;
tok->wspace = (char *) tok_malloc(WINCR);
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(tok)
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(tok)
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(tok, line, argc, argv)
Tokenizer *tok;
const char* line;
int *argc;
char ***argv;
{
const char *ptr;
while (1) {
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:
tok->quote = Q_none; /* Exit double quote mode */
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:
tok->quote = Q_doubleone;/* Quote next character */
break;
case Q_one:
*tok->wptr++ = *ptr;
tok->quote = Q_none; /* Quote this, restore state */
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:
tok->flags |= TOK_EAT;
tok->quote = Q_double; /* Back to double, eat the '\n' */
break;
case Q_one:
tok->flags |= TOK_EAT;
tok->quote = Q_none; /* No quote, more eat the '\n' */
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 (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) {
tok->amax += AINCR;
tok->argv = (char **) tok_realloc(tok->argv,
tok->amax * sizeof(char*));
}
}
}