From 7c6c8a42e32dc93fbdb98553fda3ab471deda480 Mon Sep 17 00:00:00 2001
From: pancake <pancake@nopcode.org>
Date: Wed, 13 Mar 2024 22:06:01 +0100
Subject: [PATCH] Support internal files in the tac command ##shell

---
 libr/core/cmd_cmp.inc.c  | 11 +++--------
 libr/core/cmd_type.inc.c | 40 ++++++++++++++++++++++++++++++++--------
 libr/include/r_core.h    |  2 ++
 3 files changed, 37 insertions(+), 16 deletions(-)

diff --git a/libr/core/cmd_cmp.inc.c b/libr/core/cmd_cmp.inc.c
index 3b2b034407882..c23fb2a8ca9e3 100644
--- a/libr/core/cmd_cmp.inc.c
+++ b/libr/core/cmd_cmp.inc.c
@@ -1149,16 +1149,11 @@ static int cmd_cmp(void *data, const char *input) {
 	case 'a': // "ca"
 		if (input[1] == 't') { // "cat"
 			const char *path = r_str_trim_head_ro (input + 2);
-			if (*path == '$' && !path[1]) {
-				R_LOG_ERROR ("No alias name given");
-			} else if (*path == '$') {
-				RCmdAliasVal *v = r_cmd_alias_get (core->rcmd, path + 1);
-				if (v) {
-					char *v_str = r_cmd_alias_val_strdup (v);
+			if (*path == '$') {
+				char *v_str = r_core_slurp (core, path, NULL);
+				if (v_str) {
 					r_cons_println (v_str);
 					free (v_str);
-				} else {
-					R_LOG_ERROR ("No such alias \"$%s\"", path + 1);
 				}
 			} else if (*path) {
 				if (r_fs_check (core->fs, path)) {
diff --git a/libr/core/cmd_type.inc.c b/libr/core/cmd_type.inc.c
index 0eb9c10623f9b..441129f605c7b 100644
--- a/libr/core/cmd_type.inc.c
+++ b/libr/core/cmd_type.inc.c
@@ -319,6 +319,26 @@ static void showFormat(RCore *core, const char *name, int mode) {
 	}
 }
 
+R_API char *r_core_slurp(RCore *core, const char *path, size_t *len) {
+	if (*path == '$') {
+		if (!path[1]) {
+			R_LOG_ERROR ("No alias name given");
+			return NULL;
+		}
+		RCmdAliasVal *v = r_cmd_alias_get (core->rcmd, path + 1);
+		if (!v) {
+			R_LOG_ERROR ("No such alias \"$%s\"", path + 1);
+			return NULL;
+		}
+		char *r = r_cmd_alias_val_strdup (v);
+		if (len) {
+			*len = strlen (r);
+		}
+		return r;
+	}
+	return r_file_slurp (path, len);
+}
+
 static int cmd_tac(void *data, const char *_input) { // "tac"
 	RCore *core = (RCore *) data;
 	char *input = strdup (_input);
@@ -332,15 +352,19 @@ static int cmd_tac(void *data, const char *_input) { // "tac"
 		break;
 	default: // "tac"
 		if (R_STR_ISNOTEMPTY (arg)) {
-			char *filedata = r_file_slurp (arg, NULL);
-			RList *lines = r_str_split_list (filedata, "\n", 0);
-			RListIter *iter;
-			char *line;
-			r_list_foreach_prev (lines, iter, line) {
-				r_cons_printf ("%s\n", line);
+			char *filedata = r_core_slurp (core, arg, NULL);
+			if (filedata) {
+				RList *lines = r_str_split_list (filedata, "\n", 0);
+				RListIter *iter;
+				char *line;
+				r_list_foreach_prev (lines, iter, line) {
+					r_cons_printf ("%s\n", line);
+				}
+				r_list_free (lines);
+				free (filedata);
+			} else {
+				R_LOG_ERROR ("File not found");
 			}
-			r_list_free (lines);
-			free (filedata);
 		} else {
 			r_core_cmd_help_match (core, help_msg_t, "tac");
 		}
diff --git a/libr/include/r_core.h b/libr/include/r_core.h
index 69420b2fd598e..4ebb156b45a86 100644
--- a/libr/include/r_core.h
+++ b/libr/include/r_core.h
@@ -590,6 +590,8 @@ R_API RIODesc *r_core_file_open(RCore *core, const char *file, int flags, ut64 l
 R_API RIODesc *r_core_file_open_many(RCore *r, const char *file, int flags, ut64 loadaddr);
 R_API bool r_core_file_close_all_but(RCore *core);
 
+R_API char *r_core_slurp(RCore *core, const char *path, size_t *len);
+
 R_API int r_core_setup_debugger(RCore *r, const char *debugbackend, bool attach);
 R_API int r_core_seek_delta(RCore *core, st64 addr);
 R_API bool r_core_extend_at(RCore *core, ut64 addr, int size);