rev: correct output for long input lines

The input buffer is initialised to a reasonable size and extended
if necessary.  When this happened the offset into the buffer wasn't
reset to zero so subsequent lines were appended to the long line.

Fix this and add some tests.

function                                             old     new   delta
rev_main                                             377     368      -9
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-9)               Total: -9 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Ron Yorston 2021-08-21 09:36:27 +01:00 committed by Denys Vlasenko
parent 62d5a1e56f
commit 4357569fdc
2 changed files with 47 additions and 0 deletions

46
testsuite/rev.tests Executable file
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@ -0,0 +1,46 @@
#!/bin/sh
# Copyright 2021 by Ron Yorston
# Licensed under GPLv2, see file LICENSE in this source tree.
. ./testing.sh
# testing "test name" "commands" "expected result" "file input" "stdin"
testing "rev works" \
"rev input" \
"\
1 enil
3 enil
" \
"line 1\n\nline 3\n" \
""
testing "rev file with missing newline" \
"rev input" \
"\
1 enil
3 enil" \
"line 1\n\nline 3" \
""
testing "rev file with NUL character" \
"rev input" \
"\
nil
3 enil
" \
"lin\000e 1\n\nline 3\n" \
""
testing "rev file with long line" \
"rev input" \
"\
+--------------+---------------+---------------+---------------+---------------+---------------+---------------+---------------+---------------+---------------+---------------+---------------+---------------+---------------+---------------+---------------
cba
" \
"---------------+---------------+---------------+---------------+---------------+---------------+---------------+---------------+---------------+---------------+---------------+---------------+---------------+---------------+---------------+--------------+\nabc\n" \
""
exit $FAILCOUNT

View File

@ -109,6 +109,7 @@ int rev_main(int argc UNUSED_PARAM, char **argv)
strrev(buf, strlen(buf)); strrev(buf, strlen(buf));
#endif #endif
fputs_stdout(buf); fputs_stdout(buf);
pos = 0;
} }
fclose(fp); fclose(fp);
} while (*argv); } while (*argv);