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| author | Christian Eggers | 2020-06-29 17:57:24 +0200 |
|---|---|---|
| committer | Denys Vlasenko | 2020-07-31 18:42:30 +0200 |
| commit | 39925026f6857979cbe603efd42073eb63f8d9de (patch) | |
| tree | ee64a83ed44f4ba4a34bd869e0a4c282163981bb | |
| parent | a088da4476012e067a9a49de997031ea64ac401e (diff) | |
| download | busybox-39925026f6857979cbe603efd42073eb63f8d9de.zip busybox-39925026f6857979cbe603efd42073eb63f8d9de.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>
| -rw-r--r-- | shell/ash_test/ash-read/read_d0.right | 1 | ||||
| -rwxr-xr-x | shell/ash_test/ash-read/read_d0.tests | 1 | ||||
| -rw-r--r-- | shell/hush_test/hush-read/read_d0.right | 1 | ||||
| -rwxr-xr-x | shell/hush_test/hush-read/read_d0.tests | 1 | ||||
| -rw-r--r-- | shell/shell_common.c | 4 |
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). |