From 33cc3b9dd7bf3dae1c6cf86e46bb4923f96e7fff Mon Sep 17 00:00:00 2001
From: トトも <85485984+ElectronicsArchiver@users.noreply.github.com>
Date: Sat, 16 Apr 2022 20:18:56 +0200
Subject: Source / Include Folder (#88)

Moved Source Files Into `src` Folder
---
 src/eval.c | 1644 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 1644 insertions(+)
 create mode 100644 src/eval.c

(limited to 'src/eval.c')

diff --git a/src/eval.c b/src/eval.c
new file mode 100644
index 0000000..1d0a6f2
--- /dev/null
+++ b/src/eval.c
@@ -0,0 +1,1644 @@
+/****************************************************************************
+ * bfs                                                                      *
+ * Copyright (C) 2015-2022 Tavian Barnes <tavianator@tavianator.com>        *
+ *                                                                          *
+ * Permission to use, copy, modify, and/or distribute this software for any *
+ * purpose with or without fee is hereby granted.                           *
+ *                                                                          *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES *
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF         *
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR  *
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES   *
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN    *
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF  *
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.           *
+ ****************************************************************************/
+
+/**
+ * Implementation of all the literal expressions.
+ */
+
+#include "eval.h"
+#include "bar.h"
+#include "bftw.h"
+#include "color.h"
+#include "ctx.h"
+#include "darray.h"
+#include "diag.h"
+#include "dir.h"
+#include "dstring.h"
+#include "exec.h"
+#include "expr.h"
+#include "fsade.h"
+#include "mtab.h"
+#include "printf.h"
+#include "pwcache.h"
+#include "stat.h"
+#include "trie.h"
+#include "util.h"
+#include "xregex.h"
+#include "xtime.h"
+#include <assert.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <fnmatch.h>
+#include <grp.h>
+#include <pwd.h>
+#include <stdarg.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/resource.h>
+#include <sys/stat.h>
+#include <time.h>
+#include <unistd.h>
+#include <wchar.h>
+
+struct bfs_eval {
+	/** Data about the current file. */
+	const struct BFTW *ftwbuf;
+	/** The bfs context. */
+	const struct bfs_ctx *ctx;
+	/** The bftw() callback return value. */
+	enum bftw_action action;
+	/** The bfs_eval() return value. */
+	int *ret;
+	/** Whether to quit immediately. */
+	bool quit;
+};
+
+/**
+ * Print an error message.
+ */
+BFS_FORMATTER(2, 3)
+static void eval_error(struct bfs_eval *state, const char *format, ...) {
+	// By POSIX, any errors should be accompanied by a non-zero exit status
+	*state->ret = EXIT_FAILURE;
+
+	int error = errno;
+	const struct bfs_ctx *ctx = state->ctx;
+	CFILE *cerr = ctx->cerr;
+
+	bfs_error(ctx, "%pP: ", state->ftwbuf);
+
+	va_list args;
+	va_start(args, format);
+	errno = error;
+	cvfprintf(cerr, format, args);
+	va_end(args);
+}
+
+/**
+ * Check if an error should be ignored.
+ */
+static bool eval_should_ignore(const struct bfs_eval *state, int error) {
+	return state->ctx->ignore_races
+		&& is_nonexistence_error(error)
+		&& state->ftwbuf->depth > 0;
+}
+
+/**
+ * Report an error that occurs during evaluation.
+ */
+static void eval_report_error(struct bfs_eval *state) {
+	if (!eval_should_ignore(state, errno)) {
+		eval_error(state, "%m.\n");
+	}
+}
+
+/**
+ * Perform a bfs_stat() call if necessary.
+ */
+static const struct bfs_stat *eval_stat(struct bfs_eval *state) {
+	const struct BFTW *ftwbuf = state->ftwbuf;
+	const struct bfs_stat *ret = bftw_stat(ftwbuf, ftwbuf->stat_flags);
+	if (!ret) {
+		eval_report_error(state);
+	}
+	return ret;
+}
+
+/**
+ * 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;
+}
+
+bool bfs_expr_cmp(const struct bfs_expr *expr, long long n) {
+	switch (expr->int_cmp) {
+	case BFS_INT_EQUAL:
+		return n == expr->num;
+	case BFS_INT_LESS:
+		return n < expr->num;
+	case BFS_INT_GREATER:
+		return n > expr->num;
+	}
+
+	assert(!"Invalid comparison mode");
+	return false;
+}
+
+/**
+ * -true test.
+ */
+bool eval_true(const struct bfs_expr *expr, struct bfs_eval *state) {
+	return true;
+}
+
+/**
+ * -false test.
+ */
+bool eval_false(const struct bfs_expr *expr, struct bfs_eval *state) {
+	return false;
+}
+
+/**
+ * -executable, -readable, -writable tests.
+ */
+bool eval_access(const struct bfs_expr *expr, struct bfs_eval *state) {
+	const struct BFTW *ftwbuf = state->ftwbuf;
+	return xfaccessat(ftwbuf->at_fd, ftwbuf->at_path, expr->num) == 0;
+}
+
+/**
+ * -acl test.
+ */
+bool eval_acl(const struct bfs_expr *expr, struct bfs_eval *state) {
+	int ret = bfs_check_acl(state->ftwbuf);
+	if (ret >= 0) {
+		return ret;
+	} else {
+		eval_report_error(state);
+		return false;
+	}
+}
+
+/**
+ * -capable test.
+ */
+bool eval_capable(const struct bfs_expr *expr, struct bfs_eval *state) {
+	int ret = bfs_check_capabilities(state->ftwbuf);
+	if (ret >= 0) {
+		return ret;
+	} else {
+		eval_report_error(state);
+		return false;
+	}
+}
+
+/**
+ * Get the given timespec field out of a stat buffer.
+ */
+static const struct timespec *eval_stat_time(const struct bfs_stat *statbuf, enum bfs_stat_field field, struct bfs_eval *state) {
+	const struct timespec *ret = bfs_stat_time(statbuf, field);
+	if (!ret) {
+		eval_error(state, "Couldn't get file %s: %m.\n", bfs_stat_field_name(field));
+	}
+	return ret;
+}
+
+/**
+ * -[aBcm]?newer tests.
+ */
+bool eval_newer(const struct bfs_expr *expr, struct bfs_eval *state) {
+	const struct bfs_stat *statbuf = eval_stat(state);
+	if (!statbuf) {
+		return false;
+	}
+
+	const struct timespec *time = eval_stat_time(statbuf, expr->stat_field, state);
+	if (!time) {
+		return false;
+	}
+
+	return time->tv_sec > expr->reftime.tv_sec
+		|| (time->tv_sec == expr->reftime.tv_sec && time->tv_nsec > expr->reftime.tv_nsec);
+}
+
+/**
+ * -[aBcm]{min,time} tests.
+ */
+bool eval_time(const struct bfs_expr *expr, struct bfs_eval *state) {
+	const struct bfs_stat *statbuf = eval_stat(state);
+	if (!statbuf) {
+		return false;
+	}
+
+	const struct timespec *time = eval_stat_time(statbuf, expr->stat_field, state);
+	if (!time) {
+		return false;
+	}
+
+	time_t diff = timespec_diff(&expr->reftime, time);
+	switch (expr->time_unit) {
+	case BFS_DAYS:
+		diff /= 60*24;
+		BFS_FALLTHROUGH;
+	case BFS_MINUTES:
+		diff /= 60;
+		BFS_FALLTHROUGH;
+	case BFS_SECONDS:
+		break;
+	}
+
+	return bfs_expr_cmp(expr, diff);
+}
+
+/**
+ * -used test.
+ */
+bool eval_used(const struct bfs_expr *expr, struct bfs_eval *state) {
+	const struct bfs_stat *statbuf = eval_stat(state);
+	if (!statbuf) {
+		return false;
+	}
+
+	const struct timespec *atime = eval_stat_time(statbuf, BFS_STAT_ATIME, state);
+	const struct timespec *ctime = eval_stat_time(statbuf, BFS_STAT_CTIME, state);
+	if (!atime || !ctime) {
+		return false;
+	}
+
+	long long diff = timespec_diff(atime, ctime);
+	if (diff < 0) {
+		return false;
+	}
+
+	long long day_seconds = 60*60*24;
+	diff = (diff + day_seconds - 1) / day_seconds;
+	return bfs_expr_cmp(expr, diff);
+}
+
+/**
+ * -gid test.
+ */
+bool eval_gid(const struct bfs_expr *expr, struct bfs_eval *state) {
+	const struct bfs_stat *statbuf = eval_stat(state);
+	if (!statbuf) {
+		return false;
+	}
+
+	return bfs_expr_cmp(expr, statbuf->gid);
+}
+
+/**
+ * -uid test.
+ */
+bool eval_uid(const struct bfs_expr *expr, struct bfs_eval *state) {
+	const struct bfs_stat *statbuf = eval_stat(state);
+	if (!statbuf) {
+		return false;
+	}
+
+	return bfs_expr_cmp(expr, statbuf->uid);
+}
+
+/**
+ * -nogroup test.
+ */
+bool eval_nogroup(const struct bfs_expr *expr, struct bfs_eval *state) {
+	const struct bfs_stat *statbuf = eval_stat(state);
+	if (!statbuf) {
+		return false;
+	}
+
+	const struct bfs_groups *groups = bfs_ctx_groups(state->ctx);
+	if (!groups) {
+		eval_report_error(state);
+		return false;
+	}
+
+	return bfs_getgrgid(groups, statbuf->gid) == NULL;
+}
+
+/**
+ * -nouser test.
+ */
+bool eval_nouser(const struct bfs_expr *expr, struct bfs_eval *state) {
+	const struct bfs_stat *statbuf = eval_stat(state);
+	if (!statbuf) {
+		return false;
+	}
+
+	const struct bfs_users *users = bfs_ctx_users(state->ctx);
+	if (!users) {
+		eval_report_error(state);
+		return false;
+	}
+
+	return bfs_getpwuid(users, statbuf->uid) == NULL;
+}
+
+/**
+ * -delete action.
+ */
+bool eval_delete(const struct bfs_expr *expr, struct bfs_eval *state) {
+	const struct BFTW *ftwbuf = state->ftwbuf;
+
+	// Don't try to delete the current directory
+	if (strcmp(ftwbuf->path, ".") == 0) {
+		return true;
+	}
+
+	int flag = 0;
+
+	// We need to know the actual type of the path, not what it points to
+	enum bfs_type type = bftw_type(ftwbuf, BFS_STAT_NOFOLLOW);
+	if (type == BFS_DIR) {
+		flag |= AT_REMOVEDIR;
+	} else if (type == BFS_ERROR) {
+		eval_report_error(state);
+		return false;
+	}
+
+	if (unlinkat(ftwbuf->at_fd, ftwbuf->at_path, flag) != 0) {
+		eval_report_error(state);
+		return false;
+	}
+
+	return true;
+}
+
+/** Finish any pending -exec ... + operations. */
+static int eval_exec_finish(const struct bfs_expr *expr, const struct bfs_ctx *ctx) {
+	int ret = 0;
+
+	if (expr->eval_fn == eval_exec) {
+		if (bfs_exec_finish(expr->exec) != 0) {
+			if (errno != 0) {
+				bfs_error(ctx, "%s %s: %m.\n", expr->argv[0], expr->argv[1]);
+			}
+			ret = -1;
+		}
+	} else if (bfs_expr_has_children(expr)) {
+		if (expr->lhs && eval_exec_finish(expr->lhs, ctx) != 0) {
+			ret = -1;
+		}
+		if (expr->rhs && eval_exec_finish(expr->rhs, ctx) != 0) {
+			ret = -1;
+		}
+	}
+
+	return ret;
+}
+
+/**
+ * -exec[dir]/-ok[dir] actions.
+ */
+bool eval_exec(const struct bfs_expr *expr, struct bfs_eval *state) {
+	bool ret = bfs_exec(expr->exec, state->ftwbuf) == 0;
+	if (errno != 0) {
+		eval_error(state, "%s %s: %m.\n", expr->argv[0], expr->argv[1]);
+	}
+	return ret;
+}
+
+/**
+ * -exit action.
+ */
+bool eval_exit(const struct bfs_expr *expr, struct bfs_eval *state) {
+	state->action = BFTW_STOP;
+	*state->ret = expr->num;
+	state->quit = true;
+	return true;
+}
+
+/**
+ * -depth N test.
+ */
+bool eval_depth(const struct bfs_expr *expr, struct bfs_eval *state) {
+	return bfs_expr_cmp(expr, state->ftwbuf->depth);
+}
+
+/**
+ * -empty test.
+ */
+bool eval_empty(const struct bfs_expr *expr, struct bfs_eval *state) {
+	bool ret = false;
+	const struct BFTW *ftwbuf = state->ftwbuf;
+
+	if (ftwbuf->type == BFS_DIR) {
+		struct bfs_dir *dir = bfs_opendir(ftwbuf->at_fd, ftwbuf->at_path);
+		if (!dir) {
+			eval_report_error(state);
+			goto done;
+		}
+
+		int did_read = bfs_readdir(dir, NULL);
+		if (did_read < 0) {
+			eval_report_error(state);
+		} else {
+			ret = !did_read;
+		}
+
+		bfs_closedir(dir);
+	} else if (ftwbuf->type == BFS_REG) {
+		const struct bfs_stat *statbuf = eval_stat(state);
+		if (statbuf) {
+			ret = statbuf->size == 0;
+		}
+	}
+
+done:
+	return ret;
+}
+
+/**
+ * -flags test.
+ */
+bool eval_flags(const struct bfs_expr *expr, struct bfs_eval *state) {
+	const struct bfs_stat *statbuf = eval_stat(state);
+	if (!statbuf) {
+		return false;
+	}
+
+	if (!(statbuf->mask & BFS_STAT_ATTRS)) {
+		eval_error(state, "Couldn't get file %s.\n", bfs_stat_field_name(BFS_STAT_ATTRS));
+		return false;
+	}
+
+	unsigned long flags = statbuf->attrs;
+	unsigned long set = expr->set_flags;
+	unsigned long clear = expr->clear_flags;
+
+	switch (expr->flags_cmp) {
+	case BFS_MODE_EQUAL:
+		return flags == set && !(flags & clear);
+
+	case BFS_MODE_ALL:
+		return (flags & set) == set && !(flags & clear);
+
+	case BFS_MODE_ANY:
+		return (flags & set) || (flags & clear) != clear;
+	}
+
+	assert(!"Invalid comparison mode");
+	return false;
+}
+
+/**
+ * -fstype test.
+ */
+bool eval_fstype(const struct bfs_expr *expr, struct bfs_eval *state) {
+	const struct bfs_stat *statbuf = eval_stat(state);
+	if (!statbuf) {
+		return false;
+	}
+
+	const struct bfs_mtab *mtab = bfs_ctx_mtab(state->ctx);
+	if (!mtab) {
+		eval_report_error(state);
+		return false;
+	}
+
+	const char *type = bfs_fstype(mtab, statbuf);
+	return strcmp(type, expr->argv[1]) == 0;
+}
+
+/**
+ * -hidden test.
+ */
+bool eval_hidden(const struct bfs_expr *expr, struct bfs_eval *state) {
+	const struct BFTW *ftwbuf = state->ftwbuf;
+	const char *name = ftwbuf->path + ftwbuf->nameoff;
+
+	// Don't treat "." or ".." as hidden directories.  Otherwise we'd filter
+	// out everything when given
+	//
+	//     $ bfs . -nohidden
+	//     $ bfs .. -nohidden
+	return name[0] == '.' && strcmp(name, ".") != 0 && strcmp(name, "..") != 0;
+}
+
+/**
+ * -inum test.
+ */
+bool eval_inum(const struct bfs_expr *expr, struct bfs_eval *state) {
+	const struct bfs_stat *statbuf = eval_stat(state);
+	if (!statbuf) {
+		return false;
+	}
+
+	return bfs_expr_cmp(expr, statbuf->ino);
+}
+
+/**
+ * -links test.
+ */
+bool eval_links(const struct bfs_expr *expr, struct bfs_eval *state) {
+	const struct bfs_stat *statbuf = eval_stat(state);
+	if (!statbuf) {
+		return false;
+	}
+
+	return bfs_expr_cmp(expr, statbuf->nlink);
+}
+
+/**
+ * -i?lname test.
+ */
+bool eval_lname(const struct bfs_expr *expr, struct bfs_eval *state) {
+	bool ret = false;
+	char *name = NULL;
+
+	const struct BFTW *ftwbuf = state->ftwbuf;
+	if (ftwbuf->type != BFS_LNK) {
+		goto done;
+	}
+
+	const struct bfs_stat *statbuf = bftw_cached_stat(ftwbuf, BFS_STAT_NOFOLLOW);
+	size_t len = statbuf ? statbuf->size : 0;
+
+	name = xreadlinkat(ftwbuf->at_fd, ftwbuf->at_path, len);
+	if (!name) {
+		eval_report_error(state);
+		goto done;
+	}
+
+	ret = fnmatch(expr->argv[1], name, expr->num) == 0;
+
+done:
+	free(name);
+	return ret;
+}
+
+/**
+ * -i?name test.
+ */
+bool eval_name(const struct bfs_expr *expr, struct bfs_eval *state) {
+	const struct BFTW *ftwbuf = state->ftwbuf;
+
+	const char *name = ftwbuf->path + ftwbuf->nameoff;
+	char *copy = NULL;
+	if (ftwbuf->depth == 0) {
+		// Any trailing slashes are not part of the name.  This can only
+		// happen for the root path.
+		const char *slash = strchr(name, '/');
+		if (slash && slash > name) {
+			copy = strndup(name, slash - name);
+			if (!copy) {
+				eval_report_error(state);
+				return false;
+			}
+			name = copy;
+		}
+	}
+
+	bool ret = fnmatch(expr->argv[1], name, expr->num) == 0;
+	free(copy);
+	return ret;
+}
+
+/**
+ * -i?path test.
+ */
+bool eval_path(const struct bfs_expr *expr, struct bfs_eval *state) {
+	const struct BFTW *ftwbuf = state->ftwbuf;
+	return fnmatch(expr->argv[1], ftwbuf->path, expr->num) == 0;
+}
+
+/**
+ * -perm test.
+ */
+bool eval_perm(const struct bfs_expr *expr, struct bfs_eval *state) {
+	const struct bfs_stat *statbuf = eval_stat(state);
+	if (!statbuf) {
+		return false;
+	}
+
+	mode_t mode = statbuf->mode;
+	mode_t target;
+	if (state->ftwbuf->type == BFS_DIR) {
+		target = expr->dir_mode;
+	} else {
+		target = expr->file_mode;
+	}
+
+	switch (expr->mode_cmp) {
+	case BFS_MODE_EQUAL:
+		return (mode & 07777) == target;
+
+	case BFS_MODE_ALL:
+		return (mode & target) == target;
+
+	case BFS_MODE_ANY:
+		return !(mode & target) == !target;
+	}
+
+	assert(!"Invalid comparison mode");
+	return false;
+}
+
+/**
+ * -f?ls action.
+ */
+bool eval_fls(const struct bfs_expr *expr, struct bfs_eval *state) {
+	CFILE *cfile = expr->cfile;
+	FILE *file = cfile->file;
+	const struct bfs_users *users = bfs_ctx_users(state->ctx);
+	const struct bfs_groups *groups = bfs_ctx_groups(state->ctx);
+	const struct BFTW *ftwbuf = state->ftwbuf;
+	const struct bfs_stat *statbuf = eval_stat(state);
+	if (!statbuf) {
+		goto done;
+	}
+
+	uintmax_t ino = statbuf->ino;
+	uintmax_t block_size = state->ctx->posixly_correct ? 512 : 1024;
+	uintmax_t blocks = ((uintmax_t)statbuf->blocks*BFS_STAT_BLKSIZE + block_size - 1)/block_size;
+	char mode[11];
+	xstrmode(statbuf->mode, mode);
+	char acl = bfs_check_acl(ftwbuf) > 0 ? '+' : ' ';
+	uintmax_t nlink = statbuf->nlink;
+	if (fprintf(file, "%9ju %6ju %s%c %2ju", ino, blocks, mode, acl, nlink) < 0) {
+		goto error;
+	}
+
+	uintmax_t uid = statbuf->uid;
+	const struct passwd *pwd = users ? bfs_getpwuid(users, uid) : NULL;
+	if (pwd) {
+		if (fprintf(file, " %-8s", pwd->pw_name) < 0) {
+			goto error;
+		}
+	} else {
+		if (fprintf(file, " %-8ju", uid) < 0) {
+			goto error;
+		}
+	}
+
+	uintmax_t gid = statbuf->gid;
+	const struct group *grp = groups ? bfs_getgrgid(groups, gid) : NULL;
+	if (grp) {
+		if (fprintf(file, " %-8s", grp->gr_name) < 0) {
+			goto error;
+		}
+	} else {
+		if (fprintf(file, " %-8ju", gid) < 0) {
+			goto error;
+		}
+	}
+
+	if (ftwbuf->type == BFS_BLK || ftwbuf->type == BFS_CHR) {
+		int ma = bfs_major(statbuf->rdev);
+		int mi = bfs_minor(statbuf->rdev);
+		if (fprintf(file, " %3d, %3d", ma, mi) < 0) {
+			goto error;
+		}
+	} else {
+		uintmax_t size = statbuf->size;
+		if (fprintf(file, " %8ju", size) < 0) {
+			goto error;
+		}
+	}
+
+	time_t time = statbuf->mtime.tv_sec;
+	time_t now = expr->reftime.tv_sec;
+	time_t six_months_ago = now - 6*30*24*60*60;
+	time_t tomorrow = now + 24*60*60;
+	struct tm tm;
+	if (xlocaltime(&time, &tm) != 0) {
+		goto error;
+	}
+	char time_str[256];
+	const char *time_format = "%b %e %H:%M";
+	if (time <= six_months_ago || time >= tomorrow) {
+		time_format = "%b %e  %Y";
+	}
+	if (!strftime(time_str, sizeof(time_str), time_format, &tm)) {
+		errno = EOVERFLOW;
+		goto error;
+	}
+	if (fprintf(file, " %s", time_str) < 0) {
+		goto error;
+	}
+
+	if (cfprintf(cfile, " %pP", ftwbuf) < 0) {
+		goto error;
+	}
+
+	if (ftwbuf->type == BFS_LNK) {
+		if (cfprintf(cfile, " -> %pL", ftwbuf) < 0) {
+			goto error;
+		}
+	}
+
+	if (fputc('\n', file) == EOF) {
+		goto error;
+	}
+
+done:
+	return true;
+
+error:
+	eval_report_error(state);
+	return true;
+}
+
+/**
+ * -f?print action.
+ */
+bool eval_fprint(const struct bfs_expr *expr, struct bfs_eval *state) {
+	if (cfprintf(expr->cfile, "%pP\n", state->ftwbuf) < 0) {
+		eval_report_error(state);
+	}
+	return true;
+}
+
+/**
+ * -f?print0 action.
+ */
+bool eval_fprint0(const struct bfs_expr *expr, struct bfs_eval *state) {
+	const char *path = state->ftwbuf->path;
+	size_t length = strlen(path) + 1;
+	if (fwrite(path, 1, length, expr->cfile->file) != length) {
+		eval_report_error(state);
+	}
+	return true;
+}
+
+/**
+ * -f?printf action.
+ */
+bool eval_fprintf(const struct bfs_expr *expr, struct bfs_eval *state) {
+	if (bfs_printf(expr->cfile, expr->printf, state->ftwbuf) != 0) {
+		eval_report_error(state);
+	}
+
+	return true;
+}
+
+/**
+ * -printx action.
+ */
+bool eval_fprintx(const struct bfs_expr *expr, struct bfs_eval *state) {
+	FILE *file = expr->cfile->file;
+	const char *path = state->ftwbuf->path;
+
+	while (true) {
+		size_t span = strcspn(path, " \t\n\\$'\"`");
+		if (fwrite(path, 1, span, file) != span) {
+			goto error;
+		}
+		path += span;
+
+		char c = path[0];
+		if (!c) {
+			break;
+		}
+
+		char escaped[] = {'\\', c};
+		if (fwrite(escaped, 1, sizeof(escaped), file) != sizeof(escaped)) {
+			goto error;
+		}
+		++path;
+	}
+
+
+	if (fputc('\n', file) == EOF) {
+		goto error;
+	}
+
+	return true;
+
+error:
+	eval_report_error(state);
+	return true;
+}
+
+/**
+ * -prune action.
+ */
+bool eval_prune(const struct bfs_expr *expr, struct bfs_eval *state) {
+	state->action = BFTW_PRUNE;
+	return true;
+}
+
+/**
+ * -quit action.
+ */
+bool eval_quit(const struct bfs_expr *expr, struct bfs_eval *state) {
+	state->action = BFTW_STOP;
+	state->quit = true;
+	return true;
+}
+
+/**
+ * -i?regex test.
+ */
+bool eval_regex(const struct bfs_expr *expr, struct bfs_eval *state) {
+	const char *path = state->ftwbuf->path;
+
+	int ret = bfs_regexec(expr->regex, path, BFS_REGEX_ANCHOR);
+	if (ret < 0) {
+		char *str = bfs_regerror(expr->regex);
+		if (str) {
+			eval_error(state, "%s.\n", str);
+			free(str);
+		} else {
+			eval_error(state, "bfs_regerror(): %m.\n");
+		}
+	}
+
+	return ret > 0;
+}
+
+/**
+ * -samefile test.
+ */
+bool eval_samefile(const struct bfs_expr *expr, struct bfs_eval *state) {
+	const struct bfs_stat *statbuf = eval_stat(state);
+	if (!statbuf) {
+		return false;
+	}
+
+	return statbuf->dev == expr->dev && statbuf->ino == expr->ino;
+}
+
+/**
+ * -size test.
+ */
+bool eval_size(const struct bfs_expr *expr, struct bfs_eval *state) {
+	const struct bfs_stat *statbuf = eval_stat(state);
+	if (!statbuf) {
+		return false;
+	}
+
+	static const off_t scales[] = {
+		[BFS_BLOCKS] = 512,
+		[BFS_BYTES] = 1,
+		[BFS_WORDS] = 2,
+		[BFS_KB] = 1LL << 10,
+		[BFS_MB] = 1LL << 20,
+		[BFS_GB] = 1LL << 30,
+		[BFS_TB] = 1LL << 40,
+		[BFS_PB] = 1LL << 50,
+	};
+
+	off_t scale = scales[expr->size_unit];
+	off_t size = (statbuf->size + scale - 1)/scale; // Round up
+	return bfs_expr_cmp(expr, size);
+}
+
+/**
+ * -sparse test.
+ */
+bool eval_sparse(const struct bfs_expr *expr, struct bfs_eval *state) {
+	const struct bfs_stat *statbuf = eval_stat(state);
+	if (!statbuf) {
+		return false;
+	}
+
+	blkcnt_t expected = (statbuf->size + BFS_STAT_BLKSIZE - 1)/BFS_STAT_BLKSIZE;
+	return statbuf->blocks < expected;
+}
+
+/**
+ * -type test.
+ */
+bool eval_type(const struct bfs_expr *expr, struct bfs_eval *state) {
+	return (1 << state->ftwbuf->type) & expr->num;
+}
+
+/**
+ * -xattr test.
+ */
+bool eval_xattr(const struct bfs_expr *expr, struct bfs_eval *state) {
+	int ret = bfs_check_xattrs(state->ftwbuf);
+	if (ret >= 0) {
+		return ret;
+	} else {
+		eval_report_error(state);
+		return false;
+	}
+}
+
+/**
+ * -xattrname test.
+ */
+bool eval_xattrname(const struct bfs_expr *expr, struct bfs_eval *state) {
+	int ret = bfs_check_xattr_named(state->ftwbuf, expr->argv[1]);
+	if (ret >= 0) {
+		return ret;
+	} else {
+		eval_report_error(state);
+		return false;
+	}
+}
+
+/**
+ * -xtype test.
+ */
+bool eval_xtype(const struct bfs_expr *expr, struct bfs_eval *state) {
+	const struct BFTW *ftwbuf = state->ftwbuf;
+	enum bfs_stat_flags flags = ftwbuf->stat_flags ^ (BFS_STAT_NOFOLLOW | BFS_STAT_TRYFOLLOW);
+	enum bfs_type type = bftw_type(ftwbuf, flags);
+	if (type == BFS_ERROR) {
+		eval_report_error(state);
+		return false;
+	} else {
+		return (1 << type) & expr->num;
+	}
+}
+
+#if _POSIX_MONOTONIC_CLOCK > 0
+#	define BFS_CLOCK CLOCK_MONOTONIC
+#elif _POSIX_TIMERS > 0
+#	define BFS_CLOCK CLOCK_REALTIME
+#endif
+
+/**
+ * Call clock_gettime(), if available.
+ */
+static int eval_gettime(struct bfs_eval *state, struct timespec *ts) {
+#ifdef BFS_CLOCK
+	int ret = clock_gettime(BFS_CLOCK, ts);
+	if (ret != 0) {
+		bfs_warning(state->ctx, "%pP: clock_gettime(): %m.\n", state->ftwbuf);
+	}
+	return ret;
+#else
+	return -1;
+#endif
+}
+
+/**
+ * Record an elapsed time.
+ */
+static void timespec_elapsed(struct timespec *elapsed, const struct timespec *start, const struct timespec *end) {
+	elapsed->tv_sec += end->tv_sec - start->tv_sec;
+	elapsed->tv_nsec += end->tv_nsec - start->tv_nsec;
+	if (elapsed->tv_nsec < 0) {
+		elapsed->tv_nsec += 1000000000L;
+		--elapsed->tv_sec;
+	} else if (elapsed->tv_nsec >= 1000000000L) {
+		elapsed->tv_nsec -= 1000000000L;
+		++elapsed->tv_sec;
+	}
+}
+
+/**
+ * Evaluate an expression.
+ */
+static bool eval_expr(struct bfs_expr *expr, struct bfs_eval *state) {
+	struct timespec start, end;
+	bool time = state->ctx->debug & DEBUG_RATES;
+	if (time) {
+		if (eval_gettime(state, &start) != 0) {
+			time = false;
+		}
+	}
+
+	assert(!state->quit);
+
+	bool ret = expr->eval_fn(expr, state);
+
+	if (time) {
+		if (eval_gettime(state, &end) == 0) {
+			timespec_elapsed(&expr->elapsed, &start, &end);
+		}
+	}
+
+	++expr->evaluations;
+	if (ret) {
+		++expr->successes;
+	}
+
+	if (bfs_expr_never_returns(expr)) {
+		assert(state->quit);
+	} else if (!state->quit) {
+		assert(!expr->always_true || ret);
+		assert(!expr->always_false || !ret);
+	}
+
+	return ret;
+}
+
+/**
+ * Evaluate a negation.
+ */
+bool eval_not(const struct bfs_expr *expr, struct bfs_eval *state) {
+	return !eval_expr(expr->rhs, state);
+}
+
+/**
+ * Evaluate a conjunction.
+ */
+bool eval_and(const struct bfs_expr *expr, struct bfs_eval *state) {
+	if (!eval_expr(expr->lhs, state)) {
+		return false;
+	}
+
+	if (state->quit) {
+		return false;
+	}
+
+	return eval_expr(expr->rhs, state);
+}
+
+/**
+ * Evaluate a disjunction.
+ */
+bool eval_or(const struct bfs_expr *expr, struct bfs_eval *state) {
+	if (eval_expr(expr->lhs, state)) {
+		return true;
+	}
+
+	if (state->quit) {
+		return false;
+	}
+
+	return eval_expr(expr->rhs, state);
+}
+
+/**
+ * Evaluate the comma operator.
+ */
+bool eval_comma(const struct bfs_expr *expr, struct bfs_eval *state) {
+	eval_expr(expr->lhs, state);
+
+	if (state->quit) {
+		return false;
+	}
+
+	return eval_expr(expr->rhs, state);
+}
+
+/** Update the status bar. */
+static void eval_status(struct bfs_eval *state, struct bfs_bar *bar, struct timespec *last_status, size_t count) {
+	struct timespec now;
+	if (eval_gettime(state, &now) == 0) {
+		struct timespec elapsed = {0};
+		timespec_elapsed(&elapsed, last_status, &now);
+
+		// Update every 0.1s
+		if (elapsed.tv_sec > 0 || elapsed.tv_nsec >= 100000000L) {
+			*last_status = now;
+		} else {
+			return;
+		}
+	}
+
+	size_t width = bfs_bar_width(bar);
+	if (width < 3) {
+		return;
+	}
+
+	const struct BFTW *ftwbuf = state->ftwbuf;
+
+	char *rhs = dstrprintf(" (visited: %zu, depth: %2zu)", count, ftwbuf->depth);
+	if (!rhs) {
+		return;
+	}
+
+	size_t rhslen = dstrlen(rhs);
+	if (3 + rhslen > width) {
+		dstresize(&rhs, 0);
+		rhslen = 0;
+	}
+
+	char *status = dstralloc(0);
+	if (!status) {
+		goto out_rhs;
+	}
+
+	const char *path = ftwbuf->path;
+	size_t pathlen = ftwbuf->nameoff;
+	if (ftwbuf->depth == 0) {
+		pathlen = strlen(path);
+	}
+
+	// Try to make sure even wide characters fit in the status bar
+	size_t pathmax = width - rhslen - 3;
+	size_t pathwidth = 0;
+	mbstate_t mb;
+	memset(&mb, 0, sizeof(mb));
+	while (pathlen > 0) {
+		wchar_t wc;
+		size_t len = mbrtowc(&wc, path, pathlen, &mb);
+		int cwidth;
+		if (len == (size_t)-1) {
+			// Invalid byte sequence, assume a single-width '?'
+			len = 1;
+			cwidth = 1;
+			memset(&mb, 0, sizeof(mb));
+		} else if (len == (size_t)-2) {
+			// Incomplete byte sequence, assume a single-width '?'
+			len = pathlen;
+			cwidth = 1;
+		} else {
+			cwidth = wcwidth(wc);
+			if (cwidth < 0) {
+				cwidth = 0;
+			}
+		}
+
+		if (pathwidth + cwidth > pathmax) {
+			break;
+		}
+
+		if (dstrncat(&status, path, len) != 0) {
+			goto out_rhs;
+		}
+
+		path += len;
+		pathlen -= len;
+		pathwidth += cwidth;
+	}
+
+	if (dstrcat(&status, "...") != 0) {
+		goto out_rhs;
+	}
+
+	while (pathwidth < pathmax) {
+		if (dstrapp(&status, ' ') != 0) {
+			goto out_rhs;
+		}
+		++pathwidth;
+	}
+
+	if (dstrcat(&status, rhs) != 0) {
+		goto out_rhs;
+	}
+
+	bfs_bar_update(bar, status);
+
+	dstrfree(status);
+out_rhs:
+	dstrfree(rhs);
+}
+
+/** Check if we've seen a file before. */
+static bool eval_file_unique(struct bfs_eval *state, struct trie *seen) {
+	const struct bfs_stat *statbuf = eval_stat(state);
+	if (!statbuf) {
+		return false;
+	}
+
+	bfs_file_id id;
+	bfs_stat_id(statbuf, &id);
+
+	struct trie_leaf *leaf = trie_insert_mem(seen, id, sizeof(id));
+	if (!leaf) {
+		eval_report_error(state);
+		return false;
+	}
+
+	if (leaf->value) {
+		state->action = BFTW_PRUNE;
+		return false;
+	} else {
+		leaf->value = leaf;
+		return true;
+	}
+}
+
+#define DEBUG_FLAG(flags, flag)				\
+	do {						\
+		if ((flags & flag) || flags == flag) {	\
+			fputs(#flag, stderr);		\
+			flags ^= flag;			\
+			if (flags) {			\
+				fputs(" | ", stderr);	\
+			}				\
+		}					\
+	} while (0)
+
+/**
+ * Log a stat() call.
+ */
+static void debug_stat(const struct bfs_ctx *ctx, const struct BFTW *ftwbuf, const struct bftw_stat *cache, enum bfs_stat_flags flags) {
+	bfs_debug_prefix(ctx, DEBUG_STAT);
+
+	fprintf(stderr, "bfs_stat(");
+	if (ftwbuf->at_fd == AT_FDCWD) {
+		fprintf(stderr, "AT_FDCWD");
+	} else {
+		size_t baselen = strlen(ftwbuf->path) - strlen(ftwbuf->at_path);
+		fprintf(stderr, "\"");
+		fwrite(ftwbuf->path, 1, baselen, stderr);
+		fprintf(stderr, "\"");
+	}
+
+	fprintf(stderr, ", \"%s\", ", ftwbuf->at_path);
+
+	DEBUG_FLAG(flags, BFS_STAT_FOLLOW);
+	DEBUG_FLAG(flags, BFS_STAT_NOFOLLOW);
+	DEBUG_FLAG(flags, BFS_STAT_TRYFOLLOW);
+
+	fprintf(stderr, ") == %d", cache->buf ? 0 : -1);
+
+	if (cache->error) {
+		fprintf(stderr, " [%d]", cache->error);
+	}
+
+	fprintf(stderr, "\n");
+}
+
+/**
+ * Log any stat() calls that happened.
+ */
+static void debug_stats(const struct bfs_ctx *ctx, const struct BFTW *ftwbuf) {
+	if (!(ctx->debug & DEBUG_STAT)) {
+		return;
+	}
+
+	const struct bfs_stat *statbuf = ftwbuf->stat_cache.buf;
+	if (statbuf || ftwbuf->stat_cache.error) {
+		debug_stat(ctx, ftwbuf, &ftwbuf->stat_cache, BFS_STAT_FOLLOW);
+	}
+
+	const struct bfs_stat *lstatbuf = ftwbuf->lstat_cache.buf;
+	if ((lstatbuf && lstatbuf != statbuf) || ftwbuf->lstat_cache.error) {
+		debug_stat(ctx, ftwbuf, &ftwbuf->lstat_cache, BFS_STAT_NOFOLLOW);
+	}
+}
+
+#define DUMP_MAP(value) [value] = #value
+
+/**
+ * Dump the bfs_type for -D search.
+ */
+static const char *dump_bfs_type(enum bfs_type type) {
+	static const char *types[] = {
+		DUMP_MAP(BFS_UNKNOWN),
+		DUMP_MAP(BFS_BLK),
+		DUMP_MAP(BFS_CHR),
+		DUMP_MAP(BFS_DIR),
+		DUMP_MAP(BFS_DOOR),
+		DUMP_MAP(BFS_FIFO),
+		DUMP_MAP(BFS_LNK),
+		DUMP_MAP(BFS_PORT),
+		DUMP_MAP(BFS_REG),
+		DUMP_MAP(BFS_SOCK),
+		DUMP_MAP(BFS_WHT),
+	};
+
+	if (type == BFS_ERROR) {
+		return "BFS_ERROR";
+	} else {
+		return types[type];
+	}
+}
+
+/**
+ * Dump the bftw_visit for -D search.
+ */
+static const char *dump_bftw_visit(enum bftw_visit visit) {
+	static const char *visits[] = {
+		DUMP_MAP(BFTW_PRE),
+		DUMP_MAP(BFTW_POST),
+	};
+	return visits[visit];
+}
+
+/**
+ * Dump the bftw_action for -D search.
+ */
+static const char *dump_bftw_action(enum bftw_action action) {
+	static const char *actions[] = {
+		DUMP_MAP(BFTW_CONTINUE),
+		DUMP_MAP(BFTW_PRUNE),
+		DUMP_MAP(BFTW_STOP),
+	};
+	return actions[action];
+}
+
+/**
+ * Type passed as the argument to the bftw() callback.
+ */
+struct callback_args {
+	/** The bfs context. */
+	const struct bfs_ctx *ctx;
+
+	/** The status bar. */
+	struct bfs_bar *bar;
+	/** The time of the last status update. */
+	struct timespec last_status;
+	/** The number of files visited so far. */
+	size_t count;
+
+	/** The set of seen files. */
+	struct trie *seen;
+
+	/** Eventual return value from bfs_eval(). */
+	int ret;
+};
+
+/**
+ * bftw() callback.
+ */
+static enum bftw_action eval_callback(const struct BFTW *ftwbuf, void *ptr) {
+	struct callback_args *args = ptr;
+	++args->count;
+
+	const struct bfs_ctx *ctx = args->ctx;
+
+	struct bfs_eval state;
+	state.ftwbuf = ftwbuf;
+	state.ctx = ctx;
+	state.action = BFTW_CONTINUE;
+	state.ret = &args->ret;
+	state.quit = false;
+
+	if (args->bar) {
+		eval_status(&state, args->bar, &args->last_status, args->count);
+	}
+
+	if (ftwbuf->type == BFS_ERROR) {
+		if (!eval_should_ignore(&state, ftwbuf->error)) {
+			eval_error(&state, "%s.\n", strerror(ftwbuf->error));
+		}
+		state.action = BFTW_PRUNE;
+		goto done;
+	}
+
+	if (ctx->unique && ftwbuf->visit == BFTW_PRE) {
+		if (!eval_file_unique(&state, args->seen)) {
+			goto done;
+		}
+	}
+
+	if (eval_expr(ctx->exclude, &state)) {
+		state.action = BFTW_PRUNE;
+		goto done;
+	}
+
+	if (ctx->xargs_safe && strpbrk(ftwbuf->path, " \t\n\'\"\\")) {
+		eval_error(&state, "Path is not safe for xargs.\n");
+		state.action = BFTW_PRUNE;
+		goto done;
+	}
+
+	if (ctx->maxdepth < 0 || ftwbuf->depth >= (size_t)ctx->maxdepth) {
+		state.action = BFTW_PRUNE;
+	}
+
+	// In -depth mode, only handle directories on the BFTW_POST visit
+	enum bftw_visit expected_visit = BFTW_PRE;
+	if ((ctx->flags & BFTW_POST_ORDER)
+	    && (ctx->strategy == BFTW_IDS || ftwbuf->type == BFS_DIR)
+	    && ftwbuf->depth < (size_t)ctx->maxdepth) {
+		expected_visit = BFTW_POST;
+	}
+
+	if (ftwbuf->visit == expected_visit
+	    && ftwbuf->depth >= (size_t)ctx->mindepth
+	    && ftwbuf->depth <= (size_t)ctx->maxdepth) {
+		eval_expr(ctx->expr, &state);
+	}
+
+done:
+	debug_stats(ctx, ftwbuf);
+
+	if (bfs_debug(ctx, DEBUG_SEARCH, "eval_callback({\n")) {
+		fprintf(stderr, "\t.path = \"%s\",\n", ftwbuf->path);
+		fprintf(stderr, "\t.root = \"%s\",\n", ftwbuf->root);
+		fprintf(stderr, "\t.depth = %zu,\n", ftwbuf->depth);
+		fprintf(stderr, "\t.visit = %s,\n", dump_bftw_visit(ftwbuf->visit));
+		fprintf(stderr, "\t.type = %s,\n", dump_bfs_type(ftwbuf->type));
+		fprintf(stderr, "\t.error = %d,\n", ftwbuf->error);
+		fprintf(stderr, "}) == %s\n", dump_bftw_action(state.action));
+	}
+
+	return state.action;
+}
+
+/** Check if an rlimit value is infinite. */
+static bool rlim_isinf(rlim_t r) {
+	// Consider RLIM_{INFINITY,SAVED_{CUR,MAX}} all equally infinite
+	if (r == RLIM_INFINITY) {
+		return true;
+	}
+
+#ifdef RLIM_SAVED_CUR
+	if (r == RLIM_SAVED_CUR) {
+		return true;
+	}
+#endif
+
+#ifdef RLIM_SAVED_MAX
+	if (r == RLIM_SAVED_MAX) {
+		return true;
+	}
+#endif
+
+	return false;
+}
+
+/** Compare two rlimit values, accounting for RLIM_INFINITY etc. */
+static int rlim_cmp(rlim_t a, rlim_t b) {
+	bool a_inf = rlim_isinf(a);
+	bool b_inf = rlim_isinf(b);
+	if (a_inf || b_inf) {
+		return a_inf - b_inf;
+	}
+
+	return (a > b) - (a < b);
+}
+
+/** Raise RLIMIT_NOFILE if possible, and return the new limit. */
+static int raise_fdlimit(const struct bfs_ctx *ctx) {
+	rlim_t target = 64 << 10;
+	if (rlim_cmp(target, ctx->nofile_hard) > 0) {
+		target = ctx->nofile_hard;
+	}
+
+	int ret = target;
+
+	if (rlim_cmp(target, ctx->nofile_soft) > 0) {
+		const struct rlimit rl = {
+			.rlim_cur = target,
+			.rlim_max = ctx->nofile_hard,
+		};
+		if (setrlimit(RLIMIT_NOFILE, &rl) != 0) {
+			ret = ctx->nofile_soft;
+		}
+	}
+
+	return ret;
+}
+
+/** Infer the number of file descriptors available to bftw(). */
+static int infer_fdlimit(const struct bfs_ctx *ctx, int limit) {
+	// 3 for std{in,out,err}
+	int nopen = 3 + ctx->nfiles;
+
+	// Check /proc/self/fd for the current number of open fds, if possible
+	// (we may have inherited more than just the standard ones)
+	struct bfs_dir *dir = bfs_opendir(AT_FDCWD, "/proc/self/fd");
+	if (!dir) {
+		dir = bfs_opendir(AT_FDCWD, "/dev/fd");
+	}
+	if (dir) {
+		// Account for 'dir' itself
+		nopen = -1;
+
+		while (bfs_readdir(dir, NULL) > 0) {
+			++nopen;
+		}
+
+		bfs_closedir(dir);
+	}
+
+	int ret = limit - nopen;
+	ret -= ctx->expr->persistent_fds;
+	ret -= ctx->expr->ephemeral_fds;
+
+	// bftw() needs at least 2 available fds
+	if (ret < 2) {
+		ret = 2;
+	}
+
+	return ret;
+}
+
+/**
+ * Dump the bftw() flags for -D search.
+ */
+static void dump_bftw_flags(enum bftw_flags flags) {
+	DEBUG_FLAG(flags, 0);
+	DEBUG_FLAG(flags, BFTW_STAT);
+	DEBUG_FLAG(flags, BFTW_RECOVER);
+	DEBUG_FLAG(flags, BFTW_POST_ORDER);
+	DEBUG_FLAG(flags, BFTW_FOLLOW_ROOTS);
+	DEBUG_FLAG(flags, BFTW_FOLLOW_ALL);
+	DEBUG_FLAG(flags, BFTW_DETECT_CYCLES);
+	DEBUG_FLAG(flags, BFTW_SKIP_MOUNTS);
+	DEBUG_FLAG(flags, BFTW_PRUNE_MOUNTS);
+	DEBUG_FLAG(flags, BFTW_SORT);
+	DEBUG_FLAG(flags, BFTW_BUFFER);
+
+	assert(!flags);
+}
+
+/**
+ * Dump the bftw_strategy for -D search.
+ */
+static const char *dump_bftw_strategy(enum bftw_strategy strategy) {
+	static const char *strategies[] = {
+		DUMP_MAP(BFTW_BFS),
+		DUMP_MAP(BFTW_DFS),
+		DUMP_MAP(BFTW_IDS),
+		DUMP_MAP(BFTW_EDS),
+	};
+	return strategies[strategy];
+}
+
+/** Check if we need to enable BFTW_BUFFER. */
+static bool eval_must_buffer(const struct bfs_expr *expr) {
+#if __FreeBSD__
+	// FreeBSD doesn't properly handle adding/removing directory entries
+	// during readdir() on NFS mounts.  Work around it by passing BFTW_BUFFER
+	// whenever we could be mutating the directory ourselves through -delete
+	// or -exec.  We don't attempt to handle concurrent modification by other
+	// processes, which are racey anyway.
+	//
+	// https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=57696
+	// https://github.com/tavianator/bfs/issues/67
+
+	if (expr->eval_fn == eval_delete || expr->eval_fn == eval_exec) {
+		return true;
+	}
+
+	if (bfs_expr_has_children(expr)) {
+		if (expr->lhs && eval_must_buffer(expr->lhs)) {
+			return true;
+		}
+
+		if (expr->rhs && eval_must_buffer(expr->rhs)) {
+			return true;
+		}
+	}
+#endif // __FreeBSD__
+
+	return false;
+}
+
+int bfs_eval(const struct bfs_ctx *ctx) {
+	if (!ctx->expr) {
+		return EXIT_SUCCESS;
+	}
+
+	struct callback_args args = {
+		.ctx = ctx,
+		.ret = EXIT_SUCCESS,
+	};
+
+	if (ctx->status) {
+		args.bar = bfs_bar_show();
+		if (!args.bar) {
+			bfs_warning(ctx, "Couldn't show status bar: %m.\n\n");
+		}
+	}
+
+	struct trie seen;
+	if (ctx->unique) {
+		trie_init(&seen);
+		args.seen = &seen;
+	}
+
+	int fdlimit = raise_fdlimit(ctx);
+	fdlimit = infer_fdlimit(ctx, fdlimit);
+
+	struct bftw_args bftw_args = {
+		.paths = ctx->paths,
+		.npaths = darray_length(ctx->paths),
+		.callback = eval_callback,
+		.ptr = &args,
+		.nopenfd = fdlimit,
+		.flags = ctx->flags,
+		.strategy = ctx->strategy,
+		.mtab = bfs_ctx_mtab(ctx),
+	};
+
+	if (eval_must_buffer(ctx->expr)) {
+		bftw_args.flags |= BFTW_BUFFER;
+	}
+
+	if (bfs_debug(ctx, DEBUG_SEARCH, "bftw({\n")) {
+		fprintf(stderr, "\t.paths = {\n");
+		for (size_t i = 0; i < bftw_args.npaths; ++i) {
+			fprintf(stderr, "\t\t\"%s\",\n", bftw_args.paths[i]);
+		}
+		fprintf(stderr, "\t},\n");
+		fprintf(stderr, "\t.npaths = %zu,\n", bftw_args.npaths);
+		fprintf(stderr, "\t.callback = eval_callback,\n");
+		fprintf(stderr, "\t.ptr = &args,\n");
+		fprintf(stderr, "\t.nopenfd = %d,\n", bftw_args.nopenfd);
+		fprintf(stderr, "\t.flags = ");
+		dump_bftw_flags(bftw_args.flags);
+		fprintf(stderr, ",\n\t.strategy = %s,\n", dump_bftw_strategy(bftw_args.strategy));
+		fprintf(stderr, "\t.mtab = ");
+		if (bftw_args.mtab) {
+			fprintf(stderr, "ctx->mtab");
+		} else {
+			fprintf(stderr, "NULL");
+		}
+		fprintf(stderr, ",\n})\n");
+	}
+
+	if (bftw(&bftw_args) != 0) {
+		args.ret = EXIT_FAILURE;
+		bfs_perror(ctx, "bftw()");
+	}
+
+	if (eval_exec_finish(ctx->expr, ctx) != 0) {
+		args.ret = EXIT_FAILURE;
+	}
+
+	bfs_ctx_dump(ctx, DEBUG_RATES);
+
+	if (ctx->unique) {
+		trie_destroy(&seen);
+	}
+
+	bfs_bar_hide(args.bar);
+
+	return args.ret;
+}
-- 
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