"Das U-Boot" Source Tree
cmd: printf: add helper functions from busybox
Import the following helper functions from Busybox-1.33.1 which are
required by printf.c:
process_escape_sequence from libbb/process_escape_sequence.c,
skip_whitespace from libbb/skip_whitespace.c,
overlapping_strcpy from libbb/safe_strncpy.c
src-url: https://git.busybox.net/busybox/
commit bcc5b0e6caca6c7602a6a41f "Bump version to 1.33.1"
version: 1.33.1
Signed-off-by: Roland Gaudig <roland.gaudig@weidmueller.com>
authored by
Roland Gaudig
and committed by
Tom Rini
6244cda4
9571f1ac
+121
+121
cmd/printf.c
+121
cmd/printf.c
···
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typedef void FAST_FUNC (*converter)(const char *arg, void *result);
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#define WANT_HEX_ESCAPES 0
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/* Usual "this only works for ascii compatible encodings" disclaimer. */
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#undef _tolower
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#define _tolower(X) ((X)|((char) 0x20))
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char FAST_FUNC bb_process_escape_sequence(const char **ptr)
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{
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const char *q;
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unsigned num_digits;
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unsigned n;
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unsigned base;
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num_digits = n = 0;
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base = 8;
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q = *ptr;
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if (WANT_HEX_ESCAPES && *q == 'x') {
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++q;
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base = 16;
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++num_digits;
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}
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/* bash requires leading 0 in octal escapes:
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* \02 works, \2 does not (prints \ and 2).
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* We treat \2 as a valid octal escape sequence. */
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do {
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unsigned r;
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unsigned d = (unsigned char)(*q) - '0';
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#if WANT_HEX_ESCAPES
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if (d >= 10) {
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d = (unsigned char)_tolower(*q) - 'a';
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//d += 10;
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/* The above would map 'A'-'F' and 'a'-'f' to 10-15,
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* however, some chars like '@' would map to 9 < base.
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* Do not allow that, map invalid chars to N > base:
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*/
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if ((int)d >= 0)
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d += 10;
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}
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#endif
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if (d >= base) {
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if (WANT_HEX_ESCAPES && base == 16) {
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--num_digits;
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if (num_digits == 0) {
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/* \x<bad_char>: return '\',
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* leave ptr pointing to x */
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return '\\';
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}
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}
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break;
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}
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r = n * base + d;
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if (r > UCHAR_MAX) {
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break;
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}
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n = r;
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++q;
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} while (++num_digits < 3);
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if (num_digits == 0) {
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/* Not octal or hex escape sequence.
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* Is it one-letter one? */
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/* bash builtin "echo -e '\ec'" interprets \e as ESC,
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* but coreutils "/bin/echo -e '\ec'" does not.
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* Manpages tend to support coreutils way.
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* Update: coreutils added support for \e on 28 Oct 2009. */
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static const char charmap[] ALIGN1 = {
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'a', 'b', 'e', 'f', 'n', 'r', 't', 'v', '\\', '\0',
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'\a', '\b', 27, '\f', '\n', '\r', '\t', '\v', '\\', '\\',
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};
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const char *p = charmap;
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do {
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if (*p == *q) {
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q++;
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break;
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}
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} while (*++p != '\0');
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/* p points to found escape char or NUL,
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* advance it and find what it translates to.
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* Note that \NUL and unrecognized sequence \z return '\'
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* and leave ptr pointing to NUL or z. */
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n = p[sizeof(charmap) / 2];
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}
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*ptr = q;
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return (char) n;
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}
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char* FAST_FUNC skip_whitespace(const char *s)
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{
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/* In POSIX/C locale (the only locale we care about: do we REALLY want
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* to allow Unicode whitespace in, say, .conf files? nuts!)
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* isspace is only these chars: "\t\n\v\f\r" and space.
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* "\t\n\v\f\r" happen to have ASCII codes 9,10,11,12,13.
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* Use that.
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*/
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while (*s == ' ' || (unsigned char)(*s - 9) <= (13 - 9))
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s++;
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return (char *) s;
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}
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/* Like strcpy but can copy overlapping strings. */
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void FAST_FUNC overlapping_strcpy(char *dst, const char *src)
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{
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/* Cheap optimization for dst == src case -
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* better to have it here than in many callers.
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*/
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if (dst != src) {
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while ((*dst = *src) != '\0') {
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dst++;
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src++;
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}
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}
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}
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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 == '\'') {