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authorChristian Eggers2020-06-29 17:57:24 +0200
committerDenys Vlasenko2021-01-01 14:30:58 +0100
commit94f6d1ece0b6d023f173c5b5141b92229a3830fa (patch)
tree9d5195918ea15756501bcfccaa098f6bdc2bd2ae /shell
parentfb957125d8aa83c9df6e54292327983a51ee7ffd (diff)
downloadbusybox-94f6d1ece0b6d023f173c5b5141b92229a3830fa.zip
busybox-94f6d1ece0b6d023f173c5b5141b92229a3830fa.tar.gz
shell: Fix "read -d ''" behavior
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> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'shell')
-rw-r--r--shell/ash_test/ash-read/read_d0.right1
-rwxr-xr-xshell/ash_test/ash-read/read_d0.tests1
-rw-r--r--shell/hush_test/hush-read/read_d0.right1
-rwxr-xr-xshell/hush_test/hush-read/read_d0.tests1
-rw-r--r--shell/shell_common.c4
5 files changed, 6 insertions, 2 deletions
diff --git a/shell/ash_test/ash-read/read_d0.right b/shell/ash_test/ash-read/read_d0.right
new file mode 100644
index 0000000..9daeafb
--- /dev/null
+++ b/shell/ash_test/ash-read/read_d0.right
@@ -0,0 +1 @@
+test
diff --git a/shell/ash_test/ash-read/read_d0.tests b/shell/ash_test/ash-read/read_d0.tests
new file mode 100755
index 0000000..630d807
--- /dev/null
+++ b/shell/ash_test/ash-read/read_d0.tests
@@ -0,0 +1 @@
+printf 'test\0zest\n' | (read -d '' reply; echo "$reply")
diff --git a/shell/hush_test/hush-read/read_d0.right b/shell/hush_test/hush-read/read_d0.right
new file mode 100644
index 0000000..9daeafb
--- /dev/null
+++ b/shell/hush_test/hush-read/read_d0.right
@@ -0,0 +1 @@
+test
diff --git a/shell/hush_test/hush-read/read_d0.tests b/shell/hush_test/hush-read/read_d0.tests
new file mode 100755
index 0000000..630d807
--- /dev/null
+++ b/shell/hush_test/hush-read/read_d0.tests
@@ -0,0 +1 @@
+printf 'test\0zest\n' | (read -d '' reply; echo "$reply")
diff --git a/shell/shell_common.c b/shell/shell_common.c
index 12c4a07..42c4c9c 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).