Source / Include Folder (#88)

Moved Source Files Into `src` Folder

1 files changed, 235 insertions, 0 deletions

diff --git a/src/expr.h b/src/expr.h
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+/****************************************************************************
+ * 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.           *
+ ****************************************************************************/
+
+/**
+ * The expression tree representation.
+ */
+
+#ifndef BFS_EXPR_H
+#define BFS_EXPR_H
+
+#include "color.h"
+#include "eval.h"
+#include "stat.h"
+#include <stdbool.h>
+#include <stddef.h>
+#include <sys/types.h>
+#include <time.h>
+
+/**
+ * Integer comparison modes.
+ */
+enum bfs_int_cmp {
+	/** Exactly N. */
+	BFS_INT_EQUAL,
+	/** Less than N (-N). */
+	BFS_INT_LESS,
+	/** Greater than N (+N). */
+	BFS_INT_GREATER,
+};
+
+/**
+ * Permission comparison modes.
+ */
+enum bfs_mode_cmp {
+	/** Mode is an exact match (MODE). */
+	BFS_MODE_EQUAL,
+	/** Mode has all these bits (-MODE). */
+	BFS_MODE_ALL,
+	/** Mode has any of these bits (/MODE). */
+	BFS_MODE_ANY,
+};
+
+/**
+ * Possible time units.
+ */
+enum bfs_time_unit {
+	/** Seconds. */
+	BFS_SECONDS,
+	/** Minutes. */
+	BFS_MINUTES,
+	/** Days. */
+	BFS_DAYS,
+};
+
+/**
+ * Possible file size units.
+ */
+enum bfs_size_unit {
+	/** 512-byte blocks. */
+	BFS_BLOCKS,
+	/** Single bytes. */
+	BFS_BYTES,
+	/** Two-byte words. */
+	BFS_WORDS,
+	/** Kibibytes. */
+	BFS_KB,
+	/** Mebibytes. */
+	BFS_MB,
+	/** Gibibytes. */
+	BFS_GB,
+	/** Tebibytes. */
+	BFS_TB,
+	/** Pebibytes. */
+	BFS_PB,
+};
+
+/**
+ * A command line expression.
+ */
+struct bfs_expr {
+	/** The function that evaluates this expression. */
+	bfs_eval_fn *eval_fn;
+
+	/** The number of command line arguments for this expression. */
+	size_t argc;
+	/** The command line arguments comprising this expression. */
+	char **argv;
+
+	/** The number of files this expression keeps open between evaluations. */
+	int persistent_fds;
+	/** The number of files this expression opens during evaluation. */
+	int ephemeral_fds;
+
+	/** Whether this expression has no side effects. */
+	bool pure;
+	/** Whether this expression always evaluates to true. */
+	bool always_true;
+	/** Whether this expression always evaluates to false. */
+	bool always_false;
+	/** Whether this expression doesn't appear on the command line. */
+	bool synthetic;
+
+	/** Estimated cost. */
+	float cost;
+	/** Estimated probability of success. */
+	float probability;
+	/** Number of times this predicate was evaluated. */
+	size_t evaluations;
+	/** Number of times this predicate succeeded. */
+	size_t successes;
+	/** Total time spent running this predicate. */
+	struct timespec elapsed;
+
+	/** Auxilliary data for the evaluation function. */
+	union {
+		/** Child expressions. */
+		struct {
+			/** The left hand side of the expression. */
+			struct bfs_expr *lhs;
+			/** The right hand side of the expression. */
+			struct bfs_expr *rhs;
+		};
+
+		/** Integer comparisons. */
+		struct {
+			/** Integer for this comparison. */
+			long long num;
+			/** The comparison mode. */
+			enum bfs_int_cmp int_cmp;
+
+			/** Optional extra data. */
+			union {
+				/** -size data. */
+				enum bfs_size_unit size_unit;
+
+				/** Timestamp comparison data. */
+				struct {
+					/** The stat field to look at. */
+					enum bfs_stat_field stat_field;
+					/** The reference time. */
+					struct timespec reftime;
+					/** The time unit. */
+					enum bfs_time_unit time_unit;
+				};
+			};
+		};
+
+		/** Printing actions. */
+		struct {
+			/** The output stream. */
+			CFILE *cfile;
+			/** Optional -printf format. */
+			struct bfs_printf *printf;
+		};
+
+		/** -exec data. */
+		struct bfs_exec *exec;
+
+		/** -flags data. */
+		struct {
+			/** The comparison mode. */
+			enum bfs_mode_cmp flags_cmp;
+			/** Flags that should be set. */
+			unsigned long long set_flags;
+			/** Flags that should be cleared. */
+			unsigned long long clear_flags;
+		};
+
+		/** -perm data. */
+		struct {
+			/** The comparison mode. */
+			enum bfs_mode_cmp mode_cmp;
+			/** Mode to use for files. */
+			mode_t file_mode;
+			/** Mode to use for directories (different due to X). */
+			mode_t dir_mode;
+		};
+
+		/** -regex data. */
+		struct bfs_regex *regex;
+
+		/** -samefile data. */
+		struct {
+			/** Device number of the target file. */
+			dev_t dev;
+			/** Inode number of the target file. */
+			ino_t ino;
+		};
+	};
+};
+
+/** Singleton true expression instance. */
+extern struct bfs_expr bfs_true;
+/** Singleton false expression instance. */
+extern struct bfs_expr bfs_false;
+
+/**
+ * Create a new expression.
+ */
+struct bfs_expr *bfs_expr_new(bfs_eval_fn *eval, size_t argc, char **argv);
+
+/**
+ * @return Whether the expression has child expressions.
+ */
+bool bfs_expr_has_children(const struct bfs_expr *expr);
+
+/**
+ * @return Whether expr is known to always quit.
+ */
+bool bfs_expr_never_returns(const struct bfs_expr *expr);
+
+/**
+ * @return The result of the integer comparison for this expression.
+ */
+bool bfs_expr_cmp(const struct bfs_expr *expr, long long n);
+
+/**
+ * Free an expression tree.
+ */
+void bfs_expr_free(struct bfs_expr *expr);
+
+#endif // BFS_EXPR_H