/*********************************************************************
* bfs *
* Copyright (C) 2015-2016 Tavian Barnes <tavianator@tavianator.com> *
* *
* This program is free software. It comes without any warranty, to *
* the extent permitted by applicable law. You can redistribute it *
* and/or modify it under the terms of the Do What The Fuck You Want *
* To Public License, Version 2, as published by Sam Hocevar. See *
* the COPYING file or http://www.wtfpl.net/ for more details. *
*********************************************************************/
#include "bfs.h"
#include "bftw.h"
#include "dstring.h"
#include "util.h"
#include <assert.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <fnmatch.h>
#include <grp.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>
struct eval_state {
/** Data about the current file. */
struct BFTW *ftwbuf;
/** The parsed command line. */
const struct cmdline *cmdline;
/** The bftw() callback return value. */
enum bftw_action action;
/** The eval_cmdline() return value. */
int *ret;
/** Whether to quit immediately. */
bool *quit;
/** A stat() buffer, if necessary. */
struct stat statbuf;
};
/**
* Check if an error should be ignored.
*/
static bool eval_should_ignore(const struct eval_state *state, int error) {
return state->cmdline->ignore_races
&& error == ENOENT
&& state->ftwbuf->depth > 0;
}
/**
* Report an error that occurs during evaluation.
*/
static void eval_error(struct eval_state *state) {
if (!eval_should_ignore(state, errno)) {
pretty_error(state->cmdline->stderr_colors,
"'%s': %s\n", state->ftwbuf->path, strerror(errno));
*state->ret = -1;
}
}
/**
* Perform a stat() call if necessary.
*/
static const struct stat *fill_statbuf(struct eval_state *state) {
struct BFTW *ftwbuf = state->ftwbuf;
if (!ftwbuf->statbuf) {
if (fstatat(ftwbuf->at_fd, ftwbuf->at_path, &state->statbuf, ftwbuf->at_flags) == 0) {
ftwbuf->statbuf = &state->statbuf;
} else {
eval_error(state);
}
}
return ftwbuf->statbuf;
}
/**
* Get the difference (in seconds) between two struct timespecs.
*/
static time_t timespec_diff(const struct timespec *lhs, const struct timespec *rhs) {
time_t ret = lhs->tv_sec - rhs->tv_sec;
if (lhs->tv_nsec < rhs->tv_nsec) {
--ret;
}
return ret;
}
/**
* Perform a comparison.
*/
static bool do_cmp(const struct expr *expr, long long n) {
switch (expr->cmp_flag) {
case CMP_EXACT:
return n == expr->idata;
case CMP_LESS:
return n < expr->idata;
case CMP_GREATER:
return n > expr->idata;
}
return false;
}
/**
* -true test.
*/
bool eval_true(const