[PATCH] tools: kwboot: Fix detection of quit esc sequence

[Pali Rohár]

Quit esc sequence may be also in the middle of the read buffer.
Fix the detection for that case.

Signed-off-by: Pali Rohár <p...@kernel.org>
---
 tools/kwboot.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/tools/kwboot.c b/tools/kwboot.c
index 2684f0e75a56..7737188f0d0a 100644
--- a/tools/kwboot.c
+++ b/tools/kwboot.c
@@ -1183,10 +1183,10 @@ kwboot_xmodem(int tty, const void *_img, size_t size, 
int baudrate)
 static int
 kwboot_term_pipe(int in, int out, const char *quit, int *s)
 {
+       char buf[128];
        ssize_t nin;
-       char _buf[128], *buf = _buf;
 
-       nin = read(in, buf, sizeof(_buf));
+       nin = read(in, buf, sizeof(buf));
        if (nin <= 0)
                return -1;
 
@@ -1194,18 +1194,21 @@ kwboot_term_pipe(int in, int out, const char *quit, int 
*s)
                int i;
 
                for (i = 0; i < nin; i++) {
-                       if (*buf == quit[*s]) {
+                       if (buf[i] == quit[*s]) {
                                (*s)++;
-                               if (!quit[*s])
-                                       return 0;
-                               buf++;
-                               nin--;
+                               if (!quit[*s]) {
+                                       nin = i - *s;
+                                       break;
+                               }
                        } else {
-                               if (kwboot_write(out, quit, *s) < 0)
+                               if (*s > i && kwboot_write(out, quit, *s - i) < 
0)
                                        return -1;
                                *s = 0;
                        }
                }
+
+               if (i == nin)
+                       nin -= *s;
        }
 
        if (kwboot_write(out, buf, nin) < 0)
-- 
2.20.1