mirror of
https://github.com/sheumann/hush.git
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af3f420116
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
446 lines
11 KiB
C
446 lines
11 KiB
C
/* vi: set sw=4 ts=4: */
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/* printf - format and print data
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Copyright 1999 Dave Cinege
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Portions copyright (C) 1990-1996 Free Software Foundation, Inc.
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Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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/* Usage: printf format [argument...]
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A front end to the printf function that lets it be used from the shell.
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Backslash escapes:
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\" = double quote
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\\ = backslash
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\a = alert (bell)
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\b = backspace
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\c = produce no further output
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\f = form feed
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\n = new line
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\r = carriage return
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\t = horizontal tab
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\v = vertical tab
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\0ooo = octal number (ooo is 0 to 3 digits)
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\xhhh = hexadecimal number (hhh is 1 to 3 digits)
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Additional directive:
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%b = print an argument string, interpreting backslash escapes
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The 'format' argument is re-used as many times as necessary
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to convert all of the given arguments.
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David MacKenzie <djm@gnu.ai.mit.edu>
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*/
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/* 19990508 Busy Boxed! Dave Cinege */
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//config:config PRINTF
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//config: bool "printf"
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//config: default y
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//config: help
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//config: printf is used to format and print specified strings.
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//config: It's similar to `echo' except it has more options.
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//applet:IF_PRINTF(APPLET_NOFORK(printf, printf, BB_DIR_USR_BIN, BB_SUID_DROP, printf))
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//kbuild:lib-$(CONFIG_PRINTF) += printf.o
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//usage:#define printf_trivial_usage
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//usage: "FORMAT [ARG]..."
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//usage:#define printf_full_usage "\n\n"
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//usage: "Format and print ARG(s) according to FORMAT (a-la C printf)"
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//usage:
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//usage:#define printf_example_usage
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//usage: "$ printf \"Val=%d\\n\" 5\n"
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//usage: "Val=5\n"
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#include "libbb.h"
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/* A note on bad input: neither bash 3.2 nor coreutils 6.10 stop on it.
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* They report it:
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* bash: printf: XXX: invalid number
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* printf: XXX: expected a numeric value
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* bash: printf: 123XXX: invalid number
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* printf: 123XXX: value not completely converted
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* but then they use 0 (or partially converted numeric prefix) as a value
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* and continue. They exit with 1 in this case.
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* Both accept insane field width/precision (e.g. %9999999999.9999999999d).
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* Both print error message and assume 0 if %*.*f width/precision is "bad"
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* (but negative numbers are not "bad").
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* Both accept negative numbers for %u specifier.
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*
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* We try to be compatible.
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*/
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typedef void FAST_FUNC (*converter)(const char *arg, void *result);
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static int multiconvert(const char *arg, void *result, converter convert)
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{
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if (*arg == '"' || *arg == '\'') {
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arg = utoa((unsigned char)arg[1]);
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}
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errno = 0;
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convert(arg, result);
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if (errno) {
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bb_error_msg("invalid number '%s'", arg);
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return 1;
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}
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return 0;
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}
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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 long*)result = bb_strtoull(arg, NULL, 0);
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/* both coreutils 6.10 and bash 3.2:
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* $ printf '%x\n' -2
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* fffffffffffffffe
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* Mimic that:
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*/
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if (errno) {
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*(unsigned long long*)result = bb_strtoll(arg, NULL, 0);
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}
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}
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static void FAST_FUNC conv_strtoll(const char *arg, void *result)
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{
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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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char *end;
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/* Well, this one allows leading whitespace... so what? */
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/* What I like much less is that "-" accepted too! :( */
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*(double*)result = strtod(arg, &end);
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if (end[0]) {
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errno = ERANGE;
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*(double*)result = 0;
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}
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}
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/* Callers should check errno to detect errors */
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static unsigned long long my_xstrtoull(const char *arg)
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{
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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 long my_xstrtoll(const char *arg)
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{
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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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static double my_xstrtod(const char *arg)
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{
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double result;
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multiconvert(arg, &result, conv_strtod);
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return result;
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}
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/* Handles %b; return 1 if output is to be short-circuited by \c */
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static int print_esc_string(const char *str)
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{
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char c;
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while ((c = *str) != '\0') {
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str++;
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if (c == '\\') {
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/* %b also accepts 4-digit octals of the form \0### */
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if (*str == '0') {
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if ((unsigned char)(str[1] - '0') < 8) {
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/* 2nd char is 0..7: skip leading '0' */
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str++;
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}
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}
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else if (*str == 'c') {
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return 1;
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}
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{
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/* optimization: don't force arg to be on-stack,
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* use another variable for that. */
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const char *z = str;
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c = bb_process_escape_sequence(&z);
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str = z;
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}
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}
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putchar(c);
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}
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return 0;
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}
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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 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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saved = format[fmt_length];
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format[fmt_length] = '\0';
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have_prec = strstr(format, ".*");
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have_width = strchr(format, '*');
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if (have_width - 1 == have_prec)
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have_width = NULL;
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errno = 0;
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switch (format[fmt_length - 1]) {
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case 'c':
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printf(format, *argument);
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break;
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case 'd':
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case 'i':
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llv = my_xstrtoll(argument);
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print_long:
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if (!have_width) {
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if (!have_prec)
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printf(format, llv);
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else
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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, llv);
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else
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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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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 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 {
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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, /*unused:*/ argument, argument);
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else
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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, /*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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break;
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}
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case 'f':
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case 'e':
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case 'E':
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case 'g':
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case 'G':
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dv = my_xstrtod(argument);
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if (!have_width) {
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if (!have_prec)
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printf(format, dv);
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else
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printf(format, precision, dv);
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} else {
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if (!have_prec)
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printf(format, field_width, dv);
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else
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printf(format, field_width, precision, dv);
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}
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break;
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} /* switch */
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format[fmt_length] = saved;
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}
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/* Handle params for "%*.*f". Negative numbers are ok (compat). */
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static int get_width_prec(const char *str)
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{
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int v = bb_strtoi(str, NULL, 10);
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if (errno) {
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bb_error_msg("invalid number '%s'", str);
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v = 0;
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}
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return v;
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}
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/* Print the text in FORMAT, using ARGV for arguments to any '%' directives.
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Return advanced ARGV. */
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static char **print_formatted(char *f, char **argv, int *conv_err)
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{
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char *direc_start; /* Start of % directive. */
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unsigned direc_length; /* Length of % directive. */
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int field_width; /* Arg to first '*' */
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int precision; /* Arg to second '*' */
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char **saved_argv = argv;
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for (; *f; ++f) {
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switch (*f) {
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case '%':
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direc_start = f++;
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direc_length = 1;
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field_width = precision = 0;
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if (*f == '%') {
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bb_putchar('%');
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break;
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}
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if (*f == 'b') {
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if (*argv) {
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if (print_esc_string(*argv))
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return saved_argv; /* causes main() to exit */
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++argv;
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}
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break;
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}
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if (strchr("-+ #", *f)) {
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++f;
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++direc_length;
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}
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if (*f == '*') {
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++f;
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++direc_length;
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if (*argv)
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field_width = get_width_prec(*argv++);
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} else {
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while (isdigit(*f)) {
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++f;
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++direc_length;
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}
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}
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if (*f == '.') {
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++f;
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++direc_length;
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if (*f == '*') {
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++f;
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++direc_length;
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if (*argv)
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precision = get_width_prec(*argv++);
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} else {
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while (isdigit(*f)) {
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++f;
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++direc_length;
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}
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}
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}
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/* Remove "lLhz" size modifiers, repeatedly.
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* bash does not like "%lld", but coreutils
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* happily takes even "%Llllhhzhhzd"!
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* We are 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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/* 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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} 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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*conv_err |= errno;
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free(p);
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}
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break;
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case '\\':
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if (*++f == 'c') {
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return saved_argv; /* causes main() to exit */
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}
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bb_putchar(bb_process_escape_sequence((const char **)&f));
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f--;
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break;
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default:
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putchar(*f);
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}
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}
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return argv;
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}
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int printf_main(int argc UNUSED_PARAM, char **argv)
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{
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int conv_err;
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char *format;
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char **argv2;
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/* We must check that stdout is not closed.
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* The reason for this is highly non-obvious.
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* printf_main is used from shell.
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* Shell must correctly handle 'printf "%s" foo'
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* if stdout is closed. With stdio, output gets shoveled into
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* stdout buffer, and even fflush cannot clear it out. It seems that
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* even if libc receives EBADF on write attempts, it feels determined
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* to output data no matter what. So it will try later,
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* and possibly will clobber future output. Not good. */
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// TODO: check fcntl() & O_ACCMODE == O_WRONLY or O_RDWR?
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if (fcntl(1, F_GETFL) == -1)
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return 1; /* match coreutils 6.10 (sans error msg to stderr) */
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//if (dup2(1, 1) != 1) - old way
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// return 1;
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/* bash builtin errors out on "printf '-%s-\n' foo",
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* coreutils-6.9 works. Both work with "printf -- '-%s-\n' foo".
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* We will mimic coreutils. */
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if (argv[1] && argv[1][0] == '-' && argv[1][1] == '-' && !argv[1][2])
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argv++;
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if (!argv[1]) {
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if (ENABLE_ASH_BUILTIN_PRINTF
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&& applet_name[0] != 'p'
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) {
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bb_error_msg("usage: printf FORMAT [ARGUMENT...]");
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return 2; /* bash compat */
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}
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bb_show_usage();
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}
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format = argv[1];
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argv2 = argv + 2;
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conv_err = 0;
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do {
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argv = argv2;
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argv2 = print_formatted(format, argv, &conv_err);
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} while (argv2 > argv && *argv2);
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/* coreutils compat (bash doesn't do this):
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if (*argv)
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fprintf(stderr, "excess args ignored");
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*/
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return (argv2 < argv) /* if true, print_formatted errored out */
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|| conv_err; /* print_formatted saw invalid number */
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}
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