diff options
| author | Ron Yorston <rmy@pobox.com> | 2021-01-27 11:19:14 +0000 |
|---|---|---|
| committer | Denys Vlasenko <vda.linux@googlemail.com> | 2021-02-02 13:51:14 +0100 |
| commit | e8fe9f96356a6b19ec907ea30cffc829c539a7ff (patch) | |
| tree | 1c9450cbdc4c32266241652303852acde28c14a0 | |
| parent | f3a55b306ed3803133ab028b72b255c65d94197f (diff) | |
| download | busybox-e8fe9f96356a6b19ec907ea30cffc829c539a7ff.tar.gz | |
awk: allow printf('%c') to output NUL, closes 13486
Treat the output of printf as binary rather than a null-terminated
string so that NUL characters can be output.
This is considered to be a GNU extension, though it's also available
in mawk and FreeBSD's awk.
function old new delta
evaluate 3487 3504 +17
awk_printf 504 519 +15
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 32/0) Total: 32 bytes
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
| -rw-r--r-- | editors/awk.c | 18 | ||||
| -rwxr-xr-x | testsuite/awk.tests | 5 |
2 files changed, 20 insertions, 3 deletions
diff --git a/editors/awk.c b/editors/awk.c index 2c15f9e4e..b4f6a3741 100644 --- a/editors/awk.c +++ b/editors/awk.c @@ -2155,7 +2155,10 @@ static int fmt_num(char *b, int size, const char *format, double n, int int_as_i } /* formatted output into an allocated buffer, return ptr to buffer */ -static char *awk_printf(node *n) +#if !ENABLE_FEATURE_AWK_GNU_EXTENSIONS +# define awk_printf(a, b) awk_printf(a) +#endif +static char *awk_printf(node *n, int *len) { char *b = NULL; char *fmt, *s, *f; @@ -2209,6 +2212,10 @@ static char *awk_printf(node *n) nvfree(v); b = xrealloc(b, i + 1); b[i] = '\0'; +#if ENABLE_FEATURE_AWK_GNU_EXTENSIONS + if (len) + *len = i; +#endif return b; } @@ -2666,6 +2673,7 @@ static var *evaluate(node *op, var *res) case XC( OC_PRINT ): case XC( OC_PRINTF ): { FILE *F = stdout; + IF_FEATURE_AWK_GNU_EXTENSIONS(int len;) if (op->r.n) { rstream *rsm = newfile(R.s); @@ -2703,8 +2711,12 @@ static var *evaluate(node *op, var *res) fputs(getvar_s(intvar[ORS]), F); } else { /* OC_PRINTF */ - char *s = awk_printf(op1); + char *s = awk_printf(op1, &len); +#if ENABLE_FEATURE_AWK_GNU_EXTENSIONS + fwrite(s, len, 1, F); +#else fputs(s, F); +#endif free(s); } fflush(F); @@ -2978,7 +2990,7 @@ static var *evaluate(node *op, var *res) break; case XC( OC_SPRINTF ): - setvar_p(res, awk_printf(op1)); + setvar_p(res, awk_printf(op1, NULL)); break; case XC( OC_UNARY ): { diff --git a/testsuite/awk.tests b/testsuite/awk.tests index 92c83d719..cf9b722dc 100755 --- a/testsuite/awk.tests +++ b/testsuite/awk.tests @@ -383,6 +383,11 @@ testing "awk errors on missing delete arg" \ "awk -e '{delete}' 2>&1" "awk: cmd. line:1: Too few arguments\n" "" "" SKIP= +optional FEATURE_AWK_GNU_EXTENSIONS +testing "awk printf('%c') can output NUL" \ + "awk '{printf(\"hello%c null\n\", 0)}'" "hello\0 null\n" "" "\n" +SKIP= + # testing "description" "command" "result" "infile" "stdin" testing 'awk negative field access' \ 'awk 2>&1 -- '\''{ $(-1) }'\' \ |