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| author | Denys Vlasenko | 2018-04-11 17:18:34 +0200 |
|---|---|---|
| committer | Denys Vlasenko | 2018-04-11 17:18:34 +0200 |
| commit | 44257ad5d0790a846423c9ef69a50049366b4578 (patch) | |
| tree | 8cb08256360770c85458b874e7489e5ba3183dd8 | |
| parent | 9678636911b39a7adf9b51d5b625cf4dc7e4ac81 (diff) | |
| download | busybox-44257ad5d0790a846423c9ef69a50049366b4578.zip busybox-44257ad5d0790a846423c9ef69a50049366b4578.tar.gz | |
hush: fix IFS handling in read
$ echo "X:Y:" | (IFS=": " read x y; echo "|$x|$y|")
|X|Y|
$ echo "X:Y : " | (IFS=": " read x y; echo "|$x|$y|")
|X|Y|
function old new delta
shell_builtin_read 1320 1426 +106
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
| -rw-r--r-- | shell/hush_test/hush-read/read_ifs2.right | 9 | ||||
| -rwxr-xr-x | shell/hush_test/hush-read/read_ifs2.tests | 9 | ||||
| -rw-r--r-- | shell/shell_common.c | 37 |
3 files changed, 54 insertions, 1 deletions
diff --git a/shell/hush_test/hush-read/read_ifs2.right b/shell/hush_test/hush-read/read_ifs2.right new file mode 100644 index 0000000..797137d --- /dev/null +++ b/shell/hush_test/hush-read/read_ifs2.right @@ -0,0 +1,9 @@ +|X|Y:Z:| +|X|Y:Z| +|X|Y| +|X|Y| +|X|| +|X|| +||| +Whitespace should be trimmed too: +|X|Y| diff --git a/shell/hush_test/hush-read/read_ifs2.tests b/shell/hush_test/hush-read/read_ifs2.tests new file mode 100755 index 0000000..f01a689 --- /dev/null +++ b/shell/hush_test/hush-read/read_ifs2.tests @@ -0,0 +1,9 @@ +echo "X:Y:Z:" | (IFS=": " read x y; echo "|$x|$y|") +echo "X:Y:Z" | (IFS=": " read x y; echo "|$x|$y|") +echo "X:Y:" | (IFS=": " read x y; echo "|$x|$y|") +echo "X:Y" | (IFS=": " read x y; echo "|$x|$y|") +echo "X:" | (IFS=": " read x y; echo "|$x|$y|") +echo "X" | (IFS=": " read x y; echo "|$x|$y|") +echo "" | (IFS=": " read x y; echo "|$x|$y|") +echo Whitespace should be trimmed too: +echo "X:Y : " | (IFS=": " read x y; echo "|$x|$y|") diff --git a/shell/shell_common.c b/shell/shell_common.c index 9e58ee4..0a07296 100644 --- a/shell/shell_common.c +++ b/shell/shell_common.c @@ -274,9 +274,44 @@ shell_builtin_read(void FAST_FUNC (*setvar)(const char *name, const char *val), if (argv[0]) { /* Remove trailing space $IFS chars */ - while (--bufpos >= 0 && isspace(buffer[bufpos]) && strchr(ifs, buffer[bufpos]) != NULL) + while (--bufpos >= 0 + && isspace(buffer[bufpos]) + && strchr(ifs, buffer[bufpos]) != NULL + ) { continue; + } buffer[bufpos + 1] = '\0'; + + /* Last variable takes the entire remainder with delimiters + * (sans trailing whitespace $IFS), + * but ***only "if there are fewer vars than fields"(c)***! + * The "X:Y:" case below: there are two fields, + * and therefore last delimiter (:) is eaten: + * IFS=": " + * echo "X:Y:Z:" | (read x y; echo "|$x|$y|") # |X|Y:Z:| + * echo "X:Y:Z" | (read x y; echo "|$x|$y|") # |X|Y:Z| + * echo "X:Y:" | (read x y; echo "|$x|$y|") # |X|Y|, not |X|Y:| + * echo "X:Y : " | (read x y; echo "|$x|$y|") # |X|Y| + */ + if (bufpos >= 0 + && strchr(ifs, buffer[bufpos]) != NULL + ) { + /* There _is_ a non-whitespace IFS char */ + /* Skip whitespace IFS char before it */ + while (--bufpos >= 0 + && isspace(buffer[bufpos]) + && strchr(ifs, buffer[bufpos]) != NULL + ) { + continue; + } + /* Are there $IFS chars? */ + if (strcspn(buffer, ifs) >= ++bufpos) { + /* No: last var takes one field, not more */ + /* So, drop trailing IFS delims */ + buffer[bufpos] = '\0'; + } + } + /* Use the remainder as a value for the next variable */ setvar(*argv, buffer); /* Set the rest to "" */ |