btrfs-progs: send dump: introduce helper for printing escaped path

[platform/upstream/btrfs-progs.git] / send-dump.c

diff --git a/send-dump.c b/send-dump.c
index 8540913..9cc84c2 100644 (file)
--- a/send-dump.c
+++ b/send-dump.c
@@ -28,6 +28,7 @@
 #include <limits.h>
 #include <stdlib.h>
 #include <time.h>
+#include <ctype.h>
 #include <asm/types.h>
 #include <uuid/uuid.h>
 #include "utils.h"
@@ -46,6 +47,47 @@
 })
 
 /*
+ * Print path and escape chaacters (in a C way) that could break the line.
+ * Returns the length of the escaped characters. Unprintable characters are
+ * escaped as octals.
+ */
+static int print_path_escaped(const char *path)
+{
+       size_t i;
+       size_t path_len = strlen(path);
+       int len = 0;
+
+       for (i = 0; i < path_len; i++) {
+               char c = path[i];
+
+               len++;
+               switch (c) {
+               case '\a': putchar('\\'); putchar('a'); len++; break;
+               case '\b': putchar('\\'); putchar('b'); len++; break;
+               case '\e': putchar('\\'); putchar('e'); len++; break;
+               case '\f': putchar('\\'); putchar('f'); len++; break;
+               case '\n': putchar('\\'); putchar('n'); len++; break;
+               case '\r': putchar('\\'); putchar('r'); len++; break;
+               case '\t': putchar('\\'); putchar('t'); len++; break;
+               case '\v': putchar('\\'); putchar('v'); len++; break;
+               case ' ':  putchar('\\'); putchar(' '); len++; break;
+               case '\\': putchar('\\'); putchar('\\'); len++; break;
+               default:
+                         if (!isprint(c)) {
+                                 printf("\\%c%c%c",
+                                                 '0' + ((c & 0300) >> 6),
+                                                 '0' + ((c & 070) >> 3),
+                                                 '0' + (c & 07));
+                                 len += 3;
+                         } else {
+                                 putchar(c);
+                         }
+               }
+       }
+       return len;
+}
+
+/*
  * Underlying PRINT_DUMP, the only difference is how we handle
  * the full path.
  */