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List: busybox
Subject: [PATCH 1/3] shell: Fix "read -d ''" behavior
From: Christian Eggers <ceggers () arri ! de>
Date: 2020-06-29 15:57:24
Message-ID: 20200629155726.15372-1-ceggers () arri ! de
[Download RAW message or body]
With bash's read builtin it is possible to read from a file (e.g.
device-tree) until the first '\0' character:
IFS= read -r -d '' VARIABLE < file
In busybox ash the -d extension is also implemented, but checking the
read character for '\0' has to be performed after comparing with the
delimiter.
Signed-off-by: Christian Eggers <ceggers@arri.de>
---
shell/shell_common.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/shell/shell_common.c b/shell/shell_common.c
index 12c4a073c..42c4c9c97 100644
--- a/shell/shell_common.c
+++ b/shell/shell_common.c
@@ -209,8 +209,6 @@ shell_builtin_read(struct builtin_read_params *params)
}
c = buffer[bufpos];
- if (c == '\0')
- continue;
if (!(read_flags & BUILTIN_READ_RAW)) {
if (backslash) {
backslash = 0;
@@ -225,6 +223,8 @@ shell_builtin_read(struct builtin_read_params *params)
}
if (c == delim) /* '\n' or -d CHAR */
break;
+ if (c == '\0')
+ continue;
/* $IFS splitting. NOT done if we run "read"
* without variable names (bash compat).
--
Christian Eggers
Embedded software developer
Arnold & Richter Cine Technik GmbH & Co. Betriebs KG
Sitz: Muenchen - Registergericht: Amtsgericht Muenchen - Handelsregisternummer: HRA 57918
Persoenlich haftender Gesellschafter: Arnold & Richter Cine Technik GmbH
Sitz: Muenchen - Registergericht: Amtsgericht Muenchen - Handelsregisternummer: HRB 54477
Geschaeftsfuehrer: Dr. Michael Neuhaeuser; Stephan Schenk; Walter Trauninger; Markus Zeiler
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