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 unsigned long simple_strtoul(const char *cp, char **endp,
31 unsigned long result = 0;
36 if ((*cp == 'x') && isxdigit(cp[1])) {
48 while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp-'0' : (islower(*cp)
49 ? toupper(*cp) : *cp)-'A'+10) < base) {
50 result = result*base + value;
60 int strict_strtoul(const char *cp, unsigned int base, unsigned long *res)
71 val = simple_strtoul(cp, &tail, base);
75 if ((*tail == '\0') ||
76 ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) {
84 long simple_strtol(const char *cp, char **endp, unsigned int base)
87 return -simple_strtoul(cp + 1, endp, base);
89 return simple_strtoul(cp, endp, base);
92 unsigned long ustrtoul(const char *cp, char **endp, unsigned int base)
94 unsigned long result = simple_strtoul(cp, endp, base);
105 if ((*endp)[1] == 'i') {
106 if ((*endp)[2] == 'B')
115 unsigned long long ustrtoull(const char *cp, char **endp, unsigned int base)
117 unsigned long long result = simple_strtoull(cp, endp, base);
128 if ((*endp)[1] == 'i') {
129 if ((*endp)[2] == 'B')
138 unsigned long long simple_strtoull(const char *cp, char **endp,
141 unsigned long long result = 0, value;
145 if ((*cp == 'x') && isxdigit(cp[1])) {
157 while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp - '0'
158 : (islower(*cp) ? toupper(*cp) : *cp) - 'A' + 10) < base) {
159 result = result * base + value;
169 long trailing_strtoln(const char *str, const char *end)
174 end = str + strlen(str);
175 for (p = end - 1; p > str; p--) {
177 return simple_strtoul(p + 1, NULL, 10);
183 long trailing_strtol(const char *str)
185 return trailing_strtoln(str, NULL);
188 /* we use this so that we can do without the ctype library */
189 #define is_digit(c) ((c) >= '0' && (c) <= '9')
191 static int skip_atoi(const char **s)
195 while (is_digit(**s))
196 i = i * 10 + *((*s)++) - '0';
201 /* Decimal conversion is by far the most typical, and is used
202 * for /proc and /sys data. This directly impacts e.g. top performance
203 * with many processes running. We optimize it for speed
205 * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
206 * (with permission from the author, Douglas W. Jones). */
208 /* Formats correctly any integer in [0,99999].
209 * Outputs from one to five digits depending on input.
210 * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
211 static char *put_dec_trunc(char *buf, unsigned q)
213 unsigned d3, d2, d1, d0;
218 d0 = 6*(d3 + d2 + d1) + (q & 0xf);
219 q = (d0 * 0xcd) >> 11;
221 *buf++ = d0 + '0'; /* least significant digit */
222 d1 = q + 9*d3 + 5*d2 + d1;
224 q = (d1 * 0xcd) >> 11;
226 *buf++ = d1 + '0'; /* next digit */
229 if ((d2 != 0) || (d3 != 0)) {
232 *buf++ = d2 + '0'; /* next digit */
236 q = (d3 * 0xcd) >> 11;
238 *buf++ = d3 + '0'; /* next digit */
240 *buf++ = q + '0'; /* most sign. digit */
246 /* Same with if's removed. Always emits five digits */
247 static char *put_dec_full(char *buf, unsigned q)
249 /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
250 /* but anyway, gcc produces better code with full-sized ints */
251 unsigned d3, d2, d1, d0;
257 * Possible ways to approx. divide by 10
258 * gcc -O2 replaces multiply with shifts and adds
259 * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
260 * (x * 0x67) >> 10: 1100111
261 * (x * 0x34) >> 9: 110100 - same
262 * (x * 0x1a) >> 8: 11010 - same
263 * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386)
266 d0 = 6*(d3 + d2 + d1) + (q & 0xf);
267 q = (d0 * 0xcd) >> 11;
270 d1 = q + 9*d3 + 5*d2 + d1;
271 q = (d1 * 0xcd) >> 11;
281 q = (d3 * 0xcd) >> 11; /* - shorter code */
282 /* q = (d3 * 0x67) >> 10; - would also work */
288 /* No inlining helps gcc to use registers better */
289 static noinline char *put_dec(char *buf, uint64_t num)
294 return put_dec_trunc(buf, num);
295 rem = do_div(num, 100000);
296 buf = put_dec_full(buf, rem);
300 #define ZEROPAD 1 /* pad with zero */
301 #define SIGN 2 /* unsigned/signed long */
302 #define PLUS 4 /* show plus */
303 #define SPACE 8 /* space if plus */
304 #define LEFT 16 /* left justified */
305 #define SMALL 32 /* Must be 32 == 0x20 */
306 #define SPECIAL 64 /* 0x */
308 #ifdef CONFIG_SYS_VSNPRINTF
310 * Macro to add a new character to our output string, but only if it will
311 * fit. The macro moves to the next character position in the output string.
313 #define ADDCH(str, ch) do { \
319 #define ADDCH(str, ch) (*(str)++ = (ch))
322 static char *number(char *buf, char *end, u64 num,
323 int base, int size, int precision, int type)
325 /* we are called with base 8, 10 or 16, only, thus don't need "G..." */
326 static const char digits[16] = "0123456789ABCDEF";
331 int need_pfx = ((type & SPECIAL) && base != 10);
334 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
335 * produces same digits or (maybe lowercased) letters */
336 locase = (type & SMALL);
345 } else if (type & PLUS) {
348 } else if (type & SPACE) {
359 /* generate full string in tmp[], in reverse order */
363 /* Generic code, for any base:
365 tmp[i++] = (digits[do_div(num,base)] | locase);
368 else if (base != 10) { /* 8 or 16 */
376 tmp[i++] = (digits[((unsigned char)num) & mask]
380 } else { /* base 10 */
381 i = put_dec(tmp, num) - tmp;
384 /* printing 100 using %2d gives "100", not "00" */
387 /* leading space padding */
389 if (!(type & (ZEROPAD + LEFT))) {
396 /* "0x" / "0" prefix */
400 ADDCH(buf, 'X' | locase);
402 /* zero or space padding */
403 if (!(type & LEFT)) {
404 char c = (type & ZEROPAD) ? '0' : ' ';
409 /* hmm even more zero padding? */
410 while (i <= --precision)
412 /* actual digits of result */
415 /* trailing space padding */
421 static char *string(char *buf, char *end, char *s, int field_width,
422 int precision, int flags)
429 len = strnlen(s, precision);
432 while (len < field_width--)
434 for (i = 0; i < len; ++i)
436 while (len < field_width--)
441 #ifdef CONFIG_CMD_NET
442 static const char hex_asc[] = "0123456789abcdef";
443 #define hex_asc_lo(x) hex_asc[((x) & 0x0f)]
444 #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4]
446 static inline char *pack_hex_byte(char *buf, u8 byte)
448 *buf++ = hex_asc_hi(byte);
449 *buf++ = hex_asc_lo(byte);
453 static char *mac_address_string(char *buf, char *end, u8 *addr, int field_width,
454 int precision, int flags)
456 /* (6 * 2 hex digits), 5 colons and trailing zero */
457 char mac_addr[6 * 3];
461 for (i = 0; i < 6; i++) {
462 p = pack_hex_byte(p, addr[i]);
463 if (!(flags & SPECIAL) && i != 5)
468 return string(buf, end, mac_addr, field_width, precision,
472 static char *ip6_addr_string(char *buf, char *end, u8 *addr, int field_width,
473 int precision, int flags)
475 /* (8 * 4 hex digits), 7 colons and trailing zero */
476 char ip6_addr[8 * 5];
480 for (i = 0; i < 8; i++) {
481 p = pack_hex_byte(p, addr[2 * i]);
482 p = pack_hex_byte(p, addr[2 * i + 1]);
483 if (!(flags & SPECIAL) && i != 7)
488 return string(buf, end, ip6_addr, field_width, precision,
492 static char *ip4_addr_string(char *buf, char *end, u8 *addr, int field_width,
493 int precision, int flags)
495 /* (4 * 3 decimal digits), 3 dots and trailing zero */
496 char ip4_addr[4 * 4];
497 char temp[3]; /* hold each IP quad in reverse order */
501 for (i = 0; i < 4; i++) {
502 digits = put_dec_trunc(temp, addr[i]) - temp;
503 /* reverse the digits in the quad */
511 return string(buf, end, ip4_addr, field_width, precision,
517 * Show a '%p' thing. A kernel extension is that the '%p' is followed
518 * by an extra set of alphanumeric characters that are extended format
521 * Right now we handle:
523 * - 'M' For a 6-byte MAC address, it prints the address in the
524 * usual colon-separated hex notation
525 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated
526 * decimal for v4 and colon separated network-order 16 bit hex for v6)
527 * - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is
530 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
531 * function pointers are really function descriptors, which contain a
532 * pointer to the real address.
534 static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
535 int field_width, int precision, int flags)
537 u64 num = (uintptr_t)ptr;
540 * Being a boot loader, we explicitly allow pointers to
541 * (physical) address null.
545 return string(buf, end, "(null)", field_width, precision,
549 #ifdef CONFIG_CMD_NET
552 flags |= SPECIAL | ZEROPAD;
557 field_width = sizeof(phys_addr_t) * 2 + 2;
558 num = *(phys_addr_t *)ptr;
566 return mac_address_string(buf, end, ptr, field_width,
573 return ip6_addr_string(buf, end, ptr, field_width,
576 return ip4_addr_string(buf, end, ptr, field_width,
583 if (field_width == -1) {
584 field_width = 2*sizeof(void *);
587 return number(buf, end, num, 16, field_width, precision, flags);
590 static int vsnprintf_internal(char *buf, size_t size, const char *fmt,
597 int flags; /* flags to number() */
599 int field_width; /* width of output field */
600 int precision; /* min. # of digits for integers; max
601 number of chars for from string */
602 int qualifier; /* 'h', 'l', or 'L' for integer fields */
603 /* 'z' support added 23/7/1999 S.H. */
604 /* 'z' changed to 'Z' --davidm 1/25/99 */
605 /* 't' added for ptrdiff_t */
606 char *end = buf + size;
608 #ifdef CONFIG_SYS_VSNPRINTF
609 /* Make sure end is always >= buf - do we want this in U-Boot? */
617 for (; *fmt ; ++fmt) {
626 ++fmt; /* this also skips first '%' */
645 /* get field width */
648 field_width = skip_atoi(&fmt);
649 else if (*fmt == '*') {
651 /* it's the next argument */
652 field_width = va_arg(args, int);
653 if (field_width < 0) {
654 field_width = -field_width;
659 /* get the precision */
664 precision = skip_atoi(&fmt);
665 else if (*fmt == '*') {
667 /* it's the next argument */
668 precision = va_arg(args, int);
674 /* get the conversion qualifier */
676 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
677 *fmt == 'Z' || *fmt == 'z' || *fmt == 't') {
680 if (qualifier == 'l' && *fmt == 'l') {
691 if (!(flags & LEFT)) {
692 while (--field_width > 0)
695 ADDCH(str, (unsigned char) va_arg(args, int));
696 while (--field_width > 0)
701 str = string(str, end, va_arg(args, char *),
702 field_width, precision, flags);
706 str = pointer(fmt + 1, str, end,
707 va_arg(args, void *),
708 field_width, precision, flags);
709 /* Skip all alphanumeric pointer suffixes */
710 while (isalnum(fmt[1]))
715 if (qualifier == 'l') {
716 long *ip = va_arg(args, long *);
719 int *ip = va_arg(args, int *);
728 /* integer number formats - set up the flags and "break" */
753 if (qualifier == 'L') /* "quad" for 64 bit variables */
754 num = va_arg(args, unsigned long long);
755 else if (qualifier == 'l') {
756 num = va_arg(args, unsigned long);
758 num = (signed long) num;
759 } else if (qualifier == 'Z' || qualifier == 'z') {
760 num = va_arg(args, size_t);
761 } else if (qualifier == 't') {
762 num = va_arg(args, ptrdiff_t);
763 } else if (qualifier == 'h') {
764 num = (unsigned short) va_arg(args, int);
766 num = (signed short) num;
768 num = va_arg(args, unsigned int);
770 num = (signed int) num;
772 str = number(str, end, num, base, field_width, precision,
776 #ifdef CONFIG_SYS_VSNPRINTF
786 /* the trailing null byte doesn't count towards the total */
790 #ifdef CONFIG_SYS_VSNPRINTF
791 int vsnprintf(char *buf, size_t size, const char *fmt,
794 return vsnprintf_internal(buf, size, fmt, args);
797 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
801 i = vsnprintf(buf, size, fmt, args);
803 if (likely(i < size))
810 int snprintf(char *buf, size_t size, const char *fmt, ...)
816 i = vsnprintf(buf, size, fmt, args);
822 int scnprintf(char *buf, size_t size, const char *fmt, ...)
828 i = vscnprintf(buf, size, fmt, args);
833 #endif /* CONFIG_SYS_VSNPRINT */
836 * Format a string and place it in a buffer (va_list version)
838 * @param buf The buffer to place the result into
839 * @param fmt The format string to use
840 * @param args Arguments for the format string
842 * The function returns the number of characters written
843 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
846 * If you're not already dealing with a va_list consider using sprintf().
848 int vsprintf(char *buf, const char *fmt, va_list args)
850 return vsnprintf_internal(buf, INT_MAX, fmt, args);
853 int sprintf(char *buf, const char *fmt, ...)
859 i = vsprintf(buf, fmt, args);
864 static void panic_finish(void) __attribute__ ((noreturn));
866 static void panic_finish(void)
869 #if defined(CONFIG_PANIC_HANG)
872 udelay(100000); /* allow messages to go out */
873 do_reset(NULL, 0, 0, NULL);
879 void panic_str(const char *str)
885 void panic(const char *fmt, ...)
894 void __assert_fail(const char *assertion, const char *file, unsigned line,
895 const char *function)
897 /* This will not return */
898 panic("%s:%u: %s: Assertion `%s' failed.", file, line, function,
902 char *simple_itoa(ulong i)
904 /* 21 digits plus null terminator, good for 64-bit or smaller ints */
905 static char local[22];
906 char *p = &local[21];
916 /* We don't seem to have %'d in U-Boot */
917 void print_grouped_ull(unsigned long long int_val, int digits)
922 digits = (digits + 2) / 3;
923 sprintf(str, "%*llu", digits * 3, int_val);
924 for (s = str; *s; s += grab) {
926 putc(s[-1] != ' ' ? ',' : ' ');
927 printf("%.*s", grab, s);
932 bool str2off(const char *p, loff_t *num)
936 *num = simple_strtoull(p, &endptr, 16);
937 return *p != '\0' && *endptr == '\0';
940 bool str2long(const char *p, ulong *num)
944 *num = simple_strtoul(p, &endptr, 16);
945 return *p != '\0' && *endptr == '\0';