diff options
| -rw-r--r-- | scripts/test/expand.test | 1 | ||||
| -rw-r--r-- | toys/posix/expand.c | 7 |
2 files changed, 5 insertions, 3 deletions
diff --git a/scripts/test/expand.test b/scripts/test/expand.test index 73374562..bb0ca083 100644 --- a/scripts/test/expand.test +++ b/scripts/test/expand.test @@ -11,6 +11,7 @@ testing "expand default" "expand input" " foo bar\n" "\tfoo\tbar\n" " testing "expand default stdin" "expand" " foo bar\n" "" "\tfoo\tbar\n" testing "expand single" "expand -t 2 input" " foo bar\n" "\tfoo\tbar\n" "" testing "expand tablist" "expand -t 5,10,12 input" " foo bar foo\n" "\tfoo\tbar\tfoo\n" "" +testing "expand backspace" "expand input" "foobarf bar\n" "foobarfoo\b\b\tbar\n" "" # advanced tests diff --git a/toys/posix/expand.c b/toys/posix/expand.c index 739c326d..bbe6fdf1 100644 --- a/toys/posix/expand.c +++ b/toys/posix/expand.c @@ -1,7 +1,5 @@ /* expand.c - expands tabs to space * - * FIXME: handle backspace. - * * Copyright 2012 Jonathan Clairembault <jonathan at clairembault dot fr> * * See http://http://pubs.opengroup.org/onlinepubs/9699919799/nframe.html @@ -116,7 +114,10 @@ static void expand_file(int fd, char *name) wrlinei += count; } else { /* copy input to output */ wrbuf[wrbufi++] = rdbuf[rdbufi]; - wrlinei += 1; + if (rdbuf[rdbufi] == '\b') /* go back one column on backspace */ + wrlinei -= !!wrlinei; /* do not go below zero */ + else + wrlinei += 1; /* flush expand buffer and reset tablist at newline */ if (rdbuf[rdbufi] == '\n') { writeall(STDOUT_FILENO, wrbuf, wrbufi); |