tree-wide: drop 'This file is part of systemd' blurb

[elogind.git] / src / basic / terminal-util.c

diff --git a/src/basic/terminal-util.c b/src/basic/terminal-util.c
index ac7598971f9231844ea19cf59e0b6c8fac546316..dab4f10b06700ffebdd179cda3ba11ca2d108810 100644 (file)
--- a/src/basic/terminal-util.c
+++ b/src/basic/terminal-util.c
@@ -1,7 +1,5 @@
 /* SPDX-License-Identifier: LGPL-2.1+ */
 /***
-  This file is part of systemd.
-
   Copyright 2010 Lennart Poettering
 ***/
 
@@ -28,6 +26,8 @@
 #include <unistd.h>
 
 #include "alloc-util.h"
+//#include "copy.h"
+//#include "def.h"
 #include "env-util.h"
 #include "fd-util.h"
 #include "fileio.h"
@@ -895,8 +895,17 @@ void reset_terminal_feature_caches(void) {
 }
 
 bool on_tty(void) {
+
+        /* We check both stdout and stderr, so that situations where pipes on the shell are used are reliably
+         * recognized, regardless if only the output or the errors are piped to some place. Since on_tty() is generally
+         * used to default to a safer, non-interactive, non-color mode of operation it's probably good to be defensive
+         * here, and check for both. Note that we don't check for STDIN_FILENO, because it should fine to use fancy
+         * terminal functionality when outputting stuff, even if the input is piped to us. */
+
         if (cached_on_tty < 0)
-                cached_on_tty = isatty(STDOUT_FILENO) > 0;
+                cached_on_tty =
+                        isatty(STDOUT_FILENO) > 0 &&
+                        isatty(STDERR_FILENO) > 0;
 
         return cached_on_tty;
 }
@@ -1341,8 +1350,8 @@ int terminal_urlify_path(const char *path, const char *text, char **ret) {
 
         assert(path);
 
-        /* Much like terminal_urlify() above, but takes a file system path as input, and turns it into a properl
-         * file:// URL first. */
+        /* Much like terminal_urlify() above, but takes a file system path as input
+         * and turns it into a proper file:// URL first. */
 
         if (isempty(path))
                 return -EINVAL;
@@ -1381,3 +1390,84 @@ int terminal_urlify_path(const char *path, const char *text, char **ret) {
 
         return terminal_urlify(url, text, ret);
 }
+
+static int cat_file(const char *filename, bool newline) {
+        _cleanup_fclose_ FILE *f = NULL;
+        _cleanup_free_ char *urlified = NULL;
+        int r;
+
+        f = fopen(filename, "re");
+        if (!f)
+                return -errno;
+
+        r = terminal_urlify_path(filename, NULL, &urlified);
+        if (r < 0)
+                return r;
+
+        printf("%s%s# %s%s\n",
+               newline ? "\n" : "",
+               ansi_highlight_blue(),
+               urlified,
+               ansi_normal());
+        fflush(stdout);
+
+        for (;;) {
+                _cleanup_free_ char *line = NULL;
+
+                r = read_line(f, LONG_LINE_MAX, &line);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to read \"%s\": %m", filename);
+                if (r == 0)
+                        break;
+
+                puts(line);
+        }
+
+        return 0;
+}
+
+int cat_files(const char *file, char **dropins, CatFlags flags) {
+        char **path;
+        int r;
+
+        if (file) {
+                r = cat_file(file, false);
+                if (r == -ENOENT && (flags & CAT_FLAGS_MAIN_FILE_OPTIONAL))
+                        printf("%s# config file %s not found%s\n",
+                               ansi_highlight_magenta(),
+                               file,
+                               ansi_normal());
+                else if (r < 0)
+                        return log_warning_errno(r, "Failed to cat %s: %m", file);
+        }
+
+        STRV_FOREACH(path, dropins) {
+                r = cat_file(*path, file || path != dropins);
+                if (r < 0)
+                        return log_warning_errno(r, "Failed to cat %s: %m", *path);
+        }
+
+        return 0;
+}
+
+void print_separator(void) {
+
+        /* Outputs a separator line that resolves to whitespace when copied from the terminal. We do that by outputting
+         * one line filled with spaces with ANSI underline set, followed by a second (empty) line. */
+
+        if (underline_enabled()) {
+                size_t i, c;
+
+                c = columns();
+
+                flockfile(stdout);
+                fputs_unlocked(ANSI_UNDERLINE, stdout);
+
+                for (i = 0; i < c; i++)
+                        fputc_unlocked(' ', stdout);
+
+                fputs_unlocked(ANSI_NORMAL "\n\n", stdout);
+                funlockfile(stdout);
+        } else
+                fputs("\n\n", stdout);
+}