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/*-
* Copyright (c) 2006 Verdens Gang AS
* Copyright (c) 2006-2015 Varnish Software AS
* All rights reserved.
*
* Author: Martin Blix Grydeland <martin@varnish-software.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 "config.h"
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <unistd.h> /* for MUSL */
#include "vdef.h"
#include "vas.h"
#include "vqueue.h"
#include "vre.h"
#include "vsb.h"
#include "vxp.h"
static void
vxp_append_token(struct vxp *vxp, unsigned tok, const char *b, const char *e)
{
struct token *t;
t = vxp_Alloc(vxp, sizeof *t);
AN(t);
t->tok = tok;
t->b = b;
t->e = e;
VTAILQ_INSERT_TAIL(&vxp->tokens, t, list);
vxp->t = t;
}
/* Unquote and unescape string */
static void
vxp_decstr(struct vxp *vxp)
{
const char *b, *e, *p;
char *s;
int esc = 0;
assert(vxp->t->tok == VAL);
b = vxp->t->b;
e = vxp->t->e;
assert(e - b >= 2);
b++;
e--;
s = vxp->t->dec = vxp_Alloc(vxp, (e - b) + 1);
AN(vxp->t->dec);
for (p = b; p < e; p++) {
if (!esc && *p == '\\') {
esc = 1;
continue;
}
esc = 0;
*s++ = *p;
}
*s = '\0';
}
/*
* Build a token list
*/
void
vxp_Lexer(struct vxp *vxp)
{
const char *p, *q;
unsigned u;
char quote;
for (p = vxp->b; p < vxp->e; ) {
/* Skip any space or tab */
if (isblank(*p)) {
p++;
continue;
}
if (*p == '\\' && p[1] == '\n') {
p += 2;
continue;
}
/* Skip comments */
if (*p == '#') {
while (p < vxp->e && *p != '\n')
p++;
continue;
}
/* Match for the fixed tokens */
u = vxp_fixed_token(p, &q);
if (u != 0) {
AN(q);
vxp_append_token(vxp, u, p, q);
p = q;
continue;
}
/* Match quoted strings */
if (*p == '"' || *p == '\'') {
quote = *p;
for (q = p + 1; q < vxp->e; q++) {
if (*q == '\\') {
q++;
if (q == vxp->e || *q == '\n')
break;
} else if (*q == '\n') {
break;
} else if (*q == quote) {
q++;
quote = '\0';
break;
}
}
vxp_append_token(vxp, VAL, p, q);
if (quote != '\0') {
VSB_cat(vxp->sb, "Unterminated string ");
vxp_ErrWhere(vxp, vxp->t, q - p);
return;
}
vxp_decstr(vxp);
p = q;
continue;
}
/* Match bareword */
if (isword(*p)) {
for (q = p; q < vxp->e; q++)
if (!isword(*q))
break;
vxp_append_token(vxp, VAL, p, q);
vxp->t->dec = vxp_Alloc(vxp, (q - p) + 1);
AN(vxp->t->dec);
memcpy(vxp->t->dec, p, q - p);
vxp->t->dec[q - p] = '\0';
p = q;
continue;
}
/* On to the next query */
if (*p == '\n') {
vxp_append_token(vxp, EOI, p, p + 1);
p++;
continue;
}
/* Error */
vxp_append_token(vxp, EOI, p, p + 1);
VSB_cat(vxp->sb, "Syntax error ");
vxp_ErrWhere(vxp, vxp->t, q - p);
return;
}
/* Finished */
vxp_append_token(vxp, EOI, vxp->e, vxp->e);
}
#ifdef VXP_DEBUG
#include <stdio.h>
void
vxp_PrintTokens(const struct vxp *vxp)
{
struct token *t;
fprintf(stderr, "Token list:\n");
fprintf(stderr, " %-5s %-20s %s\n", "TOK", "SUBSTR", "DECODED");
VTAILQ_FOREACH(t, &vxp->tokens, list) {
fprintf(stderr, " ");
fprintf(stderr, "%-5s", vxp_tnames[t->tok]);
fprintf(stderr, " %-20.*s", (unsigned)(t->e - t->b), t->b);
if (t->dec)
fprintf(stderr, " '%s'", t->dec);
fprintf(stderr, "\n");
}
fprintf(stderr, "\n");
}
#endif /* VXP_DEBUG */
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