4 * Copyright (C) 1991, 1992 Linus Torvalds
7 /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
9 * Wirzenius wrote this portably, Torvalds fucked it up :-)
11 * from hush: simple_itoa() was lifted from boa-0.93.15
15 #include <linux/types.h>
16 #include <linux/string.h>
17 #include <linux/ctype.h>
21 #if !defined(CONFIG_PANIC_HANG)
26 #define noinline __attribute__((noinline))
28 /* some reluctance to put this into a new limits.h, so it is here */
29 #define INT_MAX ((int)(~0U>>1))
31 unsigned long simple_strtoul(const char *cp, char **endp,
34 unsigned long result = 0;
39 if ((*cp == 'x') && isxdigit(cp[1])) {
51 while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp-'0' : (islower(*cp)
52 ? toupper(*cp) : *cp)-'A'+10) < base) {
53 result = result*base + value;
63 int strict_strtoul(const char *cp, unsigned int base, unsigned long *res)
74 val = simple_strtoul(cp, &tail, base);
78 if ((*tail == '\0') ||
79 ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) {
87 long simple_strtol(const char *cp, char **endp, unsigned int base)
90 return -simple_strtoul(cp + 1, endp, base);
92 return simple_strtoul(cp, endp, base);
95 unsigned long ustrtoul(const char *cp, char **endp, unsigned int base)
97 unsigned long result = simple_strtoul(cp, endp, base);
108 if ((*endp)[1] == 'i') {
109 if ((*endp)[2] == 'B')
118 unsigned long long ustrtoull(const char *cp, char **endp, unsigned int base)
120 unsigned long long result = simple_strtoull(cp, endp, base);
131 if ((*endp)[1] == 'i') {
132 if ((*endp)[2] == 'B')
141 unsigned long long simple_strtoull(const char *cp, char **endp,
144 unsigned long long result = 0, value;
148 if ((*cp == 'x') && isxdigit(cp[1])) {
160 while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp - '0'
161 : (islower(*cp) ? toupper(*cp) : *cp) - 'A' + 10) < base) {
162 result = result * base + value;
172 /* we use this so that we can do without the ctype library */
173 #define is_digit(c) ((c) >= '0' && (c) <= '9')
175 static int skip_atoi(const char **s)
179 while (is_digit(**s))
180 i = i * 10 + *((*s)++) - '0';
185 /* Decimal conversion is by far the most typical, and is used
186 * for /proc and /sys data. This directly impacts e.g. top performance
187 * with many processes running. We optimize it for speed
189 * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
190 * (with permission from the author, Douglas W. Jones). */
192 /* Formats correctly any integer in [0,99999].
193 * Outputs from one to five digits depending on input.
194 * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
195 static char *put_dec_trunc(char *buf, unsigned q)
197 unsigned d3, d2, d1, d0;
202 d0 = 6*(d3 + d2 + d1) + (q & 0xf);
203 q = (d0 * 0xcd) >> 11;
205 *buf++ = d0 + '0'; /* least significant digit */
206 d1 = q + 9*d3 + 5*d2 + d1;
208 q = (d1 * 0xcd) >> 11;
210 *buf++ = d1 + '0'; /* next digit */
213 if ((d2 != 0) || (d3 != 0)) {
216 *buf++ = d2 + '0'; /* next digit */
220 q = (d3 * 0xcd) >> 11;
222 *buf++ = d3 + '0'; /* next digit */
224 *buf++ = q + '0'; /* most sign. digit */
230 /* Same with if's removed. Always emits five digits */
231 static char *put_dec_full(char *buf, unsigned q)
233 /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
234 /* but anyway, gcc produces better code with full-sized ints */
235 unsigned d3, d2, d1, d0;
241 * Possible ways to approx. divide by 10
242 * gcc -O2 replaces multiply with shifts and adds
243 * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
244 * (x * 0x67) >> 10: 1100111
245 * (x * 0x34) >> 9: 110100 - same
246 * (x * 0x1a) >> 8: 11010 - same
247 * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386)
250 d0 = 6*(d3 + d2 + d1) + (q & 0xf);
251 q = (d0 * 0xcd) >> 11;
254 d1 = q + 9*d3 + 5*d2 + d1;
255 q = (d1 * 0xcd) >> 11;
265 q = (d3 * 0xcd) >> 11; /* - shorter code */
266 /* q = (d3 * 0x67) >> 10; - would also work */
272 /* No inlining helps gcc to use registers better */
273 static noinline char *put_dec(char *buf, uint64_t num)
278 return put_dec_trunc(buf, num);
279 rem = do_div(num, 100000);
280 buf = put_dec_full(buf, rem);
284 #define ZEROPAD 1 /* pad with zero */
285 #define SIGN 2 /* unsigned/signed long */
286 #define PLUS 4 /* show plus */
287 #define SPACE 8 /* space if plus */
288 #define LEFT 16 /* left justified */
289 #define SMALL 32 /* Must be 32 == 0x20 */
290 #define SPECIAL 64 /* 0x */
292 #ifdef CONFIG_SYS_VSNPRINTF
294 * Macro to add a new character to our output string, but only if it will
295 * fit. The macro moves to the next character position in the output string.
297 #define ADDCH(str, ch) do { \
303 #define ADDCH(str, ch) (*(str)++ = (ch))
306 static char *number(char *buf, char *end, u64 num,
307 int base, int size, int precision, int type)
309 /* we are called with base 8, 10 or 16, only, thus don't need "G..." */
310 static const char digits[16] = "0123456789ABCDEF";
315 int need_pfx = ((type & SPECIAL) && base != 10);
318 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
319 * produces same digits or (maybe lowercased) letters */
320 locase = (type & SMALL);
329 } else if (type & PLUS) {
332 } else if (type & SPACE) {
343 /* generate full string in tmp[], in reverse order */
347 /* Generic code, for any base:
349 tmp[i++] = (digits[do_div(num,base)] | locase);
352 else if (base != 10) { /* 8 or 16 */
360 tmp[i++] = (digits[((unsigned char)num) & mask]
364 } else { /* base 10 */
365 i = put_dec(tmp, num) - tmp;
368 /* printing 100 using %2d gives "100", not "00" */
371 /* leading space padding */
373 if (!(type & (ZEROPAD + LEFT))) {
380 /* "0x" / "0" prefix */
384 ADDCH(buf, 'X' | locase);
386 /* zero or space padding */
387 if (!(type & LEFT)) {
388 char c = (type & ZEROPAD) ? '0' : ' ';
393 /* hmm even more zero padding? */
394 while (i <= --precision)
396 /* actual digits of result */
399 /* trailing space padding */
405 static char *string(char *buf, char *end, char *s, int field_width,
406 int precision, int flags)
413 len = strnlen(s, precision);
416 while (len < field_width--)
418 for (i = 0; i < len; ++i)
420 while (len < field_width--)
425 #ifdef CONFIG_CMD_NET
426 static const char hex_asc[] = "0123456789abcdef";
427 #define hex_asc_lo(x) hex_asc[((x) & 0x0f)]
428 #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4]
430 static inline char *pack_hex_byte(char *buf, u8 byte)
432 *buf++ = hex_asc_hi(byte);
433 *buf++ = hex_asc_lo(byte);
437 static char *mac_address_string(char *buf, char *end, u8 *addr, int field_width,
438 int precision, int flags)
440 /* (6 * 2 hex digits), 5 colons and trailing zero */
441 char mac_addr[6 * 3];
445 for (i = 0; i < 6; i++) {
446 p = pack_hex_byte(p, addr[i]);
447 if (!(flags & SPECIAL) && i != 5)
452 return string(buf, end, mac_addr, field_width, precision,
456 static char *ip6_addr_string(char *buf, char *end, u8 *addr, int field_width,
457 int precision, int flags)
459 /* (8 * 4 hex digits), 7 colons and trailing zero */
460 char ip6_addr[8 * 5];
464 for (i = 0; i < 8; i++) {
465 p = pack_hex_byte(p, addr[2 * i]);
466 p = pack_hex_byte(p, addr[2 * i + 1]);
467 if (!(flags & SPECIAL) && i != 7)
472 return string(buf, end, ip6_addr, field_width, precision,
476 static char *ip4_addr_string(char *buf, char *end, u8 *addr, int field_width,
477 int precision, int flags)
479 /* (4 * 3 decimal digits), 3 dots and trailing zero */
480 char ip4_addr[4 * 4];
481 char temp[3]; /* hold each IP quad in reverse order */
485 for (i = 0; i < 4; i++) {
486 digits = put_dec_trunc(temp, addr[i]) - temp;
487 /* reverse the digits in the quad */
495 return string(buf, end, ip4_addr, field_width, precision,
501 * Show a '%p' thing. A kernel extension is that the '%p' is followed
502 * by an extra set of alphanumeric characters that are extended format
505 * Right now we handle:
507 * - 'M' For a 6-byte MAC address, it prints the address in the
508 * usual colon-separated hex notation
509 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated
510 * decimal for v4 and colon separated network-order 16 bit hex for v6)
511 * - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is
514 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
515 * function pointers are really function descriptors, which contain a
516 * pointer to the real address.
518 static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
519 int field_width, int precision, int flags)
522 * Being a boot loader, we explicitly allow pointers to
523 * (physical) address null.
527 return string(buf, end, "(null)", field_width, precision,
531 #ifdef CONFIG_CMD_NET
537 return mac_address_string(buf, end, ptr, field_width,
544 return ip6_addr_string(buf, end, ptr, field_width,
547 return ip4_addr_string(buf, end, ptr, field_width,
554 if (field_width == -1) {
555 field_width = 2*sizeof(void *);
558 return number(buf, end, (unsigned long)ptr, 16, field_width,
562 static int vsnprintf_internal(char *buf, size_t size, const char *fmt,
569 int flags; /* flags to number() */
571 int field_width; /* width of output field */
572 int precision; /* min. # of digits for integers; max
573 number of chars for from string */
574 int qualifier; /* 'h', 'l', or 'L' for integer fields */
575 /* 'z' support added 23/7/1999 S.H. */
576 /* 'z' changed to 'Z' --davidm 1/25/99 */
577 /* 't' added for ptrdiff_t */
578 char *end = buf + size;
580 #ifdef CONFIG_SYS_VSNPRINTF
581 /* Make sure end is always >= buf - do we want this in U-Boot? */
589 for (; *fmt ; ++fmt) {
598 ++fmt; /* this also skips first '%' */
617 /* get field width */
620 field_width = skip_atoi(&fmt);
621 else if (*fmt == '*') {
623 /* it's the next argument */
624 field_width = va_arg(args, int);
625 if (field_width < 0) {
626 field_width = -field_width;
631 /* get the precision */
636 precision = skip_atoi(&fmt);
637 else if (*fmt == '*') {
639 /* it's the next argument */
640 precision = va_arg(args, int);
646 /* get the conversion qualifier */
648 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
649 *fmt == 'Z' || *fmt == 'z' || *fmt == 't') {
652 if (qualifier == 'l' && *fmt == 'l') {
663 if (!(flags & LEFT)) {
664 while (--field_width > 0)
667 ADDCH(str, (unsigned char) va_arg(args, int));
668 while (--field_width > 0)
673 str = string(str, end, va_arg(args, char *),
674 field_width, precision, flags);
678 str = pointer(fmt + 1, str, end,
679 va_arg(args, void *),
680 field_width, precision, flags);
681 /* Skip all alphanumeric pointer suffixes */
682 while (isalnum(fmt[1]))
687 if (qualifier == 'l') {
688 long *ip = va_arg(args, long *);
691 int *ip = va_arg(args, int *);
700 /* integer number formats - set up the flags and "break" */
725 if (qualifier == 'L') /* "quad" for 64 bit variables */
726 num = va_arg(args, unsigned long long);
727 else if (qualifier == 'l') {
728 num = va_arg(args, unsigned long);
730 num = (signed long) num;
731 } else if (qualifier == 'Z' || qualifier == 'z') {
732 num = va_arg(args, size_t);
733 } else if (qualifier == 't') {
734 num = va_arg(args, ptrdiff_t);
735 } else if (qualifier == 'h') {
736 num = (unsigned short) va_arg(args, int);
738 num = (signed short) num;
740 num = va_arg(args, unsigned int);
742 num = (signed int) num;
744 str = number(str, end, num, base, field_width, precision,
748 #ifdef CONFIG_SYS_VSNPRINTF
758 /* the trailing null byte doesn't count towards the total */
762 #ifdef CONFIG_SYS_VSNPRINTF
763 int vsnprintf(char *buf, size_t size, const char *fmt,
766 return vsnprintf_internal(buf, size, fmt, args);
769 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
773 i = vsnprintf(buf, size, fmt, args);
775 if (likely(i < size))
782 int snprintf(char *buf, size_t size, const char *fmt, ...)
788 i = vsnprintf(buf, size, fmt, args);
794 int scnprintf(char *buf, size_t size, const char *fmt, ...)
800 i = vscnprintf(buf, size, fmt, args);
805 #endif /* CONFIG_SYS_VSNPRINT */
808 * Format a string and place it in a buffer (va_list version)
810 * @param buf The buffer to place the result into
811 * @param fmt The format string to use
812 * @param args Arguments for the format string
814 * The function returns the number of characters written
815 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
818 * If you're not already dealing with a va_list consider using sprintf().
820 int vsprintf(char *buf, const char *fmt, va_list args)
822 return vsnprintf_internal(buf, INT_MAX, fmt, args);
825 int sprintf(char *buf, const char *fmt, ...)
831 i = vsprintf(buf, fmt, args);
836 void panic(const char *fmt, ...)
843 #if defined(CONFIG_PANIC_HANG)
846 udelay(100000); /* allow messages to go out */
847 do_reset(NULL, 0, 0, NULL);
853 void __assert_fail(const char *assertion, const char *file, unsigned line,
854 const char *function)
856 /* This will not return */
857 panic("%s:%u: %s: Assertion `%s' failed.", file, line, function,
861 char *simple_itoa(ulong i)
863 /* 21 digits plus null terminator, good for 64-bit or smaller ints */
864 static char local[22];
865 char *p = &local[21];
875 /* We don't seem to have %'d in U-Boot */
876 void print_grouped_ull(unsigned long long int_val, int digits)
881 digits = (digits + 2) / 3;
882 sprintf(str, "%*llu", digits * 3, int_val);
883 for (s = str; *s; s += grab) {
885 putc(s[-1] != ' ' ? ',' : ' ');
886 printf("%.*s", grab, s);