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/*
* Samba Unix/Linux SMB client library
*
* Copyright (C) Gregor Beck 2010
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file srprs.c
* @author Gregor Beck <gb@sernet.de>
* @date Aug 2010
* @brief A simple recursive parser.
*/
#include "replace.h"
#include "system/locale.h"
#include "srprs.h"
#include "cbuf.h"
#include <assert.h>
bool srprs_skipws(const char** ptr) {
while (isspace(**ptr))
++(*ptr);
return true;
}
bool srprs_char(const char** ptr, char c) {
if (**ptr == c) {
++(*ptr);
return true;
}
return false;
}
bool srprs_str(const char** ptr, const char* str, ssize_t len)
{
/* By definition *ptr must be null terminated. */
size_t ptr_len = strlen(*ptr);
if (len == -1)
len = strlen(str);
/* Don't memcmp read past end of buffer. */
if (len > ptr_len) {
return false;
}
if (memcmp(*ptr, str, len) == 0) {
*ptr += len;
return true;
}
return false;
}
bool srprs_charset(const char** ptr, const char* set, cbuf* oss)
{
const char* p = strchr(set, **ptr);
if (p != NULL && *p != '\0') {
cbuf_putc(oss, **ptr);
++(*ptr);
return true;
}
return false;
}
bool srprs_charsetinv(const char** ptr, const char* set, cbuf* oss)
{
if ((**ptr != '\0') && (strchr(set, **ptr) == NULL)) {
cbuf_putc(oss, **ptr);
++(*ptr);
return true;
}
return false;
}
bool srprs_quoted_string(const char** ptr, cbuf* str, bool* cont)
{
const char* pos = *ptr;
const size_t spos = cbuf_getpos(str);
if (cont == NULL || *cont == false) {
if (!srprs_char(&pos, '\"'))
goto fail;
}
while (true) {
while (srprs_charsetinv(&pos, "\\\"", str))
;
switch (*pos) {
case '\0':
if (cont == NULL) {
goto fail;
} else {
*ptr = pos;
*cont = true;
return true;
}
case '\"':
*ptr = pos+1;
if (cont != NULL) {
*cont = false;
}
return true;
case '\\':
pos++;
if (!srprs_charset(&pos, "\\\"", str))
goto fail;
break;
default:
assert(false);
}
}
fail:
cbuf_setpos(str, spos);
return false;
}
bool srprs_hex(const char** ptr, size_t len, unsigned* u)
{
const char *str = *ptr;
const char *pos = *ptr;
int ret;
size_t i;
char buf[8+1] = {};
assert((len >= 1) && (len <= 8));
for (i=0; i<len; i++) {
if (!srprs_charset(&pos, "0123456789abcdefABCDEF", NULL)) {
break;
}
buf[i] = str[i];
}
ret = sscanf(buf, "%8x", u);
if ( ret != 1 ) {
return false;
}
*ptr = pos;
return true;
}
bool srprs_nl(const char** ptr, cbuf* nl)
{
static const char CRLF[] = "\r\n";
if (srprs_str(ptr, CRLF, sizeof(CRLF) - 1)) {
cbuf_puts(nl, CRLF, sizeof(CRLF) - 1);
return true;
}
return srprs_charset(ptr, "\n\r", nl);
}
bool srprs_eos(const char** ptr)
{
return (**ptr == '\0');
}
bool srprs_eol(const char** ptr, cbuf* nl)
{
return srprs_eos(ptr) || srprs_nl(ptr, nl);
}
bool srprs_line(const char** ptr, cbuf* str)
{
while (srprs_charsetinv(ptr, "\n\r", str))
;
return true;
}
bool srprs_quoted(const char** ptr, cbuf* str)
{
const char* pos = *ptr;
const size_t spos = cbuf_getpos(str);
if (!srprs_char(&pos, '"')) {
goto fail;
}
while (true) {
while (srprs_charsetinv(&pos, "\\\"", str))
;
switch (*pos) {
case '\0':
goto fail;
case '"':
*ptr = pos+1;
return true;
case '\\':
pos++;
if (!srprs_charset(&pos, "\\\"", str)) {
unsigned u;
if (!srprs_hex(&pos, 2, &u)) {
goto fail;
}
cbuf_putc(str, u);
}
break;
default:
assert(false);
}
}
fail:
cbuf_setpos(str, spos);
return false;
}
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