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// SPDX-FileCopyrightText: 2012-2025 Markus Uhlin <maxxe@rpblc.net>
// SPDX-License-Identifier: ISC
#include <err.h>
#include <errno.h>
#include <iostream>
#include <stdexcept>
#include "interpreter.h"
#include "utils.h"
const char g_fgets_nullret_err1[70] = "error: fgets() returned null and the "
"error indicator is set";
const char g_fgets_nullret_err2[70] = "error: fgets() returned null for an "
"unknown reason";
static const char ArgBegin = '"';
static const char ArgEnd = '"';
static const char CommentChar = '#';
static const size_t identifier_maxSize = 64;
static const size_t argument_maxSize = 400;
/**
* Copy identifier
*/
static char *
copy_identifier(const char *&id)
{
size_t count = identifier_maxSize;
char *dest_buf = new char[count + 1];
char *dest = &dest_buf[0];
while ((isalnum(*id) || *id == '_') && count > 1)
*dest++ = *id++, count--;
*dest = '\0';
if (count == 1)
errx(1, "%s: fatal: string was truncated", __func__);
return dest_buf;
}
/**
* Copy argument
*/
//lint -sem(copy_argument, r_null)
static char *
copy_argument(const char *&arg)
{
bool inside_arg = true;
size_t count = argument_maxSize;
char *dest_buf = new char[count + 1];
char *dest = &dest_buf[0];
while (*arg && count > 1) {
if (*arg == ArgEnd) {
inside_arg = false;
arg++;
break;
}
*dest++ = *arg++, count--;
}
*dest = '\0';
if (inside_arg && count == 1)
errx(1, "%s: fatal: string was truncated", __func__);
if (inside_arg) {
delete[] dest_buf;
return nullptr;
}
return dest_buf;
}
static void
clean_up(char *id, char *arg)
{
delete[] id;
delete[] arg;
}
/**
* Interpreter
*
* @param in Context structure
* @return Void
*
* An interpreter for configuration files. The context structure
* contains the data to be passed to the interpreter.
*/
void
Interpreter(const struct Interpreter_in *in)
{
char *id = nullptr;
char *arg = nullptr;
if (in == nullptr)
errx(1, "%s: invalid argument", __func__);
try {
const char *cp = &in->line[0];
if (!isalnum(*cp) && *cp != '_')
throw std::runtime_error("unexpected leading "
"character");
id = copy_identifier(cp);
adv_while_isspace(&cp);
if (*cp++ != '=') {
throw std::runtime_error("expected assignment "
"operator");
}
adv_while_isspace(&cp);
if (*cp++ != ArgBegin)
throw std::runtime_error("expected arg begin");
else if ((arg = copy_argument(cp)) == nullptr)
throw std::runtime_error("unterminated argument");
adv_while_isspace(&cp);
if (*cp++ != ';')
throw std::runtime_error("no line terminator!");
adv_while_isspace(&cp);
if (*cp && *cp != CommentChar) {
throw std::runtime_error("implicit data after "
"line terminator!");
} else if (!(in->validator_func(id))) {
#if IGNORE_UNRECOGNIZED_IDENTIFIERS
/* ignore */;
#else
throw std::runtime_error("no such identifier");
#endif
} else if ((errno = in->install_func(id, arg)) != 0) {
throw std::runtime_error("install error");
}
} catch (const std::bad_alloc &e) {
std::cerr << "out of memory: " << e.what() << '\n';
clean_up(id, arg);
abort();
} catch (const std::runtime_error &e) {
std::cerr << '\t' << in->line << '\n';
if (strings_match(e.what(), "install error")) {
warn("%s:%ld: error: "
"install_func returned %d", in->path, in->line_num,
errno);
} else {
warnx("%s:%ld: error: %s", in->path, in->line_num,
e.what());
}
clean_up(id, arg);
abort();
} catch (...) {
std::cerr << "unknown exception -- should not be reached\n";
clean_up(id, arg);
abort();
}
clean_up(id, arg);
}
void
Interpreter_processAllLines(FILE *fp, const char *path, Interpreter_vFunc func1,
Interpreter_instFunc func2)
{
char buf[MAXLINE] = { '\0' };
long int line_num = 0;
while (fgets(buf, sizeof buf, fp) != nullptr) {
char *line;
const char *cp;
struct Interpreter_in in;
cp = &buf[0];
adv_while_isspace(&cp);
if (strings_match(cp, "") || *cp == CommentChar) {
line_num++;
continue;
}
if ((line = eattailwhite(xstrdup(cp))) == nullptr)
errx(1, "%s: unexpected null pointer", __func__);
in.path = const_cast<char *>(path);
in.line = line;
in.line_num = ++line_num;
in.validator_func = func1;
in.install_func = func2;
Interpreter(&in);
free(line);
}
}
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