mirror of
https://github.com/topjohnwu/ndk-busybox.git
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printf: make integer format strings print long long-sized values.
function old new delta printf_main 668 834 +166 bb_strtoll - 84 +84 print_direc 391 431 +40 conv_strtoull - 19 +19 conv_strtoll - 19 +19 conv_strtoul 16 - -16 conv_strtol 16 - -16 ------------------------------------------------------------------------------ (add/remove: 4/2 grow/shrink: 2/0 up/down: 342/-32) Total: 296 bytes
This commit is contained in:
Denis Vlasenko
parent
0416e3dde1
commit
cb39a7ca6d
@ -75,13 +75,13 @@ static int multiconvert(const char *arg, void *result, converter convert)
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return 0;
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}
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static void FAST_FUNC conv_strtoul(const char *arg, void *result)
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static void FAST_FUNC conv_strtoull(const char *arg, void *result)
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{
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*(unsigned long*)result = bb_strtoul(arg, NULL, 0);
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*(unsigned long long*)result = bb_strtoull(arg, NULL, 0);
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}
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static void FAST_FUNC conv_strtol(const char *arg, void *result)
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static void FAST_FUNC conv_strtoll(const char *arg, void *result)
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{
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*(long*)result = bb_strtol(arg, NULL, 0);
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*(long long*)result = bb_strtoll(arg, NULL, 0);
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}
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static void FAST_FUNC conv_strtod(const char *arg, void *result)
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{
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@ -96,17 +96,17 @@ static void FAST_FUNC conv_strtod(const char *arg, void *result)
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}
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/* Callers should check errno to detect errors */
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static unsigned long my_xstrtoul(const char *arg)
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static unsigned long long my_xstrtoull(const char *arg)
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{
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unsigned long result;
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if (multiconvert(arg, &result, conv_strtoul))
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unsigned long long result;
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if (multiconvert(arg, &result, conv_strtoull))
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result = 0;
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return result;
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}
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static long my_xstrtol(const char *arg)
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static long long my_xstrtoll(const char *arg)
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{
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long result;
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if (multiconvert(arg, &result, conv_strtol))
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long long result;
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if (multiconvert(arg, &result, conv_strtoll))
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result = 0;
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return result;
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}
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@ -134,7 +134,7 @@ static void print_direc(char *format, unsigned fmt_length,
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int field_width, int precision,
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const char *argument)
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{
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long lv;
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long long llv;
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double dv;
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char saved;
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char *have_prec, *have_width;
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@ -153,42 +153,44 @@ static void print_direc(char *format, unsigned fmt_length,
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break;
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case 'd':
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case 'i':
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lv = my_xstrtol(argument);
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llv = my_xstrtoll(argument);
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print_long:
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/* if (errno) return; - see comment at the top */
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if (!have_width) {
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if (!have_prec)
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printf(format, lv);
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printf(format, llv);
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else
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printf(format, precision, lv);
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printf(format, precision, llv);
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} else {
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if (!have_prec)
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printf(format, field_width, lv);
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printf(format, field_width, llv);
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else
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printf(format, field_width, precision, lv);
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printf(format, field_width, precision, llv);
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}
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break;
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case 'o':
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case 'u':
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case 'x':
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case 'X':
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lv = my_xstrtoul(argument);
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llv = my_xstrtoull(argument);
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/* cheat: unsigned long and long have same width, so... */
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goto print_long;
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case 's':
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/* Are char* and long the same? (true for most arches) */
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if (sizeof(argument) == sizeof(lv)) {
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lv = (long)(ptrdiff_t)argument;
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/* Are char* and long long the same? */
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if (sizeof(argument) == sizeof(llv)) {
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llv = (long long)(ptrdiff_t)argument;
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goto print_long;
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} else { /* Hope compiler will optimize it out */
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} else {
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/* Hope compiler will optimize it out by moving call
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* instruction after the ifs... */
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if (!have_width) {
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if (!have_prec)
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printf(format, argument);
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printf(format, argument, /*unused:*/ argument, argument);
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else
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printf(format, precision, argument);
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printf(format, precision, argument, /*unused:*/ argument);
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} else {
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if (!have_prec)
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printf(format, field_width, argument);
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printf(format, field_width, argument, /*unused:*/ argument);
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else
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printf(format, field_width, precision, argument);
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}
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@ -286,38 +288,48 @@ static char **print_formatted(char *f, char **argv)
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}
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}
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}
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/* Remove size modifiers - "%Ld" would try to printf
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* long long, we pass long, and it spews garbage */
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if ((*f | 0x20) == 'l' || *f == 'h' || *f == 'z') {
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/* Remove "lLhz" size modifiers, repeatedly.
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* bash does not like "%lld", but coreutils
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* would happily take even "%Llllhhzhhzd"!
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* We will be permissive like coreutils */
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while ((*f | 0x20) == 'l' || *f == 'h' || *f == 'z') {
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overlapping_strcpy(f, f + 1);
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}
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//FIXME: actually, the same happens with bare "%d":
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//it printfs an int, but we pass long!
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//What saves us is that on most arches stack slot
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//is pointer-sized -> long-sized -> ints are promoted to longs
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// for variadic functions -> printf("%d", int_v) is in reality
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// indistinqushable from printf("%d", long_v) ->
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// since printf("%d", int_v) works, printf("%d", long_v) has to work.
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//But "clean" solution would be to add "l" to d,i,o,x,X.
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//Probably makes sense to go all the way to "ll" then.
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//Coreutils support long long-sized arguments.
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/* needed - try "printf %" without it */
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if (!strchr("diouxXfeEgGcs", *f)) {
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bb_error_msg("%s: invalid format", direc_start);
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/* causes main() to exit with error */
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return saved_argv - 1;
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/* Add "ll" if integer modifier, then print */
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{
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static const char format_chars[] ALIGN1 = "diouxXfeEgGcs";
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char *p = strchr(format_chars, *f);
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/* needed - try "printf %" without it */
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if (p == NULL) {
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bb_error_msg("%s: invalid format", direc_start);
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/* causes main() to exit with error */
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return saved_argv - 1;
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}
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++direc_length;
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if (p - format_chars <= 5) {
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/* it is one of "diouxX" */
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p = xmalloc(direc_length + 3);
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memcpy(p, direc_start, direc_length);
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p[direc_length + 1] = p[direc_length - 1];
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p[direc_length - 1] = 'l';
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p[direc_length] = 'l';
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//bb_error_msg("<%s>", p);
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direc_length += 2;
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direc_start = p;
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} else {
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p = NULL;
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}
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if (*argv) {
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print_direc(direc_start, direc_length, field_width,
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precision, *argv);
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++argv;
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} else {
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print_direc(direc_start, direc_length, field_width,
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precision, "");
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}
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free(p);
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}
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++direc_length;
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if (*argv) {
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print_direc(direc_start, direc_length, field_width,
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precision, *argv);
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++argv;
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} else {
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print_direc(direc_start, direc_length, field_width,
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precision, "");
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}
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/* if (errno) return saved_argv - 1; */
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break;
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case '\\':
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if (*++f == 'c') {
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