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/*
* Copyright (c) 2013-2024 Pablo Neira Ayuso <pablo@netfilter.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 (or any
* later) as published by the Free Software Foundation.
*/
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <utils.h>
#include "list.h"
#include "parser.h"
#include "erec.h"
struct str_buf {
uint8_t *str;
uint32_t len;
uint32_t size;
};
#define STR_BUF_LEN 128
static struct str_buf *str_buf_alloc(void)
{
struct str_buf *buf;
buf = xzalloc(sizeof(*buf));
buf->str = xzalloc_array(1, STR_BUF_LEN);
buf->size = STR_BUF_LEN;
return buf;
}
static int str_buf_add(struct str_buf *buf, const char *str, uint32_t len)
{
uint8_t *tmp;
if (len + buf->len > buf->size) {
buf->size = (len + buf->len) * 2;
tmp = xrealloc(buf->str, buf->size);
buf->str = tmp;
}
memcpy(&buf->str[buf->len], str, len);
buf->len += len;
return 0;
}
struct str_chunk {
struct list_head list;
char *str;
uint32_t len;
bool is_sym;
};
static void add_str_chunk(const char *x, int from, int to, struct list_head *list, bool is_sym)
{
struct str_chunk *chunk;
int len = to - from;
chunk = xzalloc_array(1, sizeof(*chunk));
chunk->str = xzalloc_array(1, len + 1);
chunk->is_sym = is_sym;
chunk->len = len;
memcpy(chunk->str, &x[from], len);
list_add_tail(&chunk->list, list);
}
static void free_str_chunk(struct str_chunk *chunk)
{
free(chunk->str);
free(chunk);
}
const char *str_preprocess(struct parser_state *state, struct location *loc,
struct scope *scope, const char *x,
struct error_record **erec)
{
struct str_chunk *chunk, *next;
struct str_buf *buf;
const char *str;
int i, j, start;
LIST_HEAD(list);
start = 0;
i = 0;
while (1) {
if (x[i] == '\0') {
i++;
break;
}
if (x[i] != '$') {
i++;
continue;
}
if (isdigit(x[++i]))
continue;
j = i;
while (1) {
if (isalpha(x[i]) ||
isdigit(x[i]) ||
x[i] == '_') {
i++;
continue;
}
break;
}
add_str_chunk(x, start, j-1, &list, false);
add_str_chunk(x, j, i, &list, true);
start = i;
}
if (start != i)
add_str_chunk(x, start, i, &list, false);
buf = str_buf_alloc();
list_for_each_entry_safe(chunk, next, &list, list) {
if (chunk->is_sym) {
struct symbol *sym;
sym = symbol_lookup(scope, chunk->str);
if (!sym) {
sym = symbol_lookup_fuzzy(scope, chunk->str);
if (sym) {
*erec = error(loc, "unknown identifier '%s'; "
"did you mean identifier '%s'?",
chunk->str, sym->identifier);
} else {
*erec = error(loc, "unknown identifier '%s'",
chunk->str);
}
goto err;
}
str_buf_add(buf, sym->expr->identifier,
strlen(sym->expr->identifier));
} else {
str_buf_add(buf, chunk->str, chunk->len);
}
list_del(&chunk->list);
free_str_chunk(chunk);
}
str = (char *)buf->str;
free(buf);
return (char *)str;
err:
list_for_each_entry_safe(chunk, next, &list, list) {
list_del(&chunk->list);
free_str_chunk(chunk);
}
free(buf->str);
free(buf);
return NULL;
}
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