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 NUM_TYPE long long
27 #define noinline __attribute__((noinline))
29 /* some reluctance to put this into a new limits.h, so it is here */
30 #define INT_MAX ((int)(~0U>>1))
32 const char hex_asc[] = "0123456789abcdef";
33 #define hex_asc_lo(x) hex_asc[((x) & 0x0f)]
34 #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4]
36 static inline char *pack_hex_byte(char *buf, u8 byte)
38 *buf++ = hex_asc_hi(byte);
39 *buf++ = hex_asc_lo(byte);
43 unsigned long simple_strtoul(const char *cp,char **endp,unsigned int base)
45 unsigned long result = 0,value;
49 if ((*cp == 'x') && isxdigit(cp[1])) {
60 while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp-'0' : (islower(*cp)
61 ? toupper(*cp) : *cp)-'A'+10) < base) {
62 result = result*base + value;
70 int strict_strtoul(const char *cp, unsigned int base, unsigned long *res)
81 val = simple_strtoul(cp, &tail, base);
85 if ((*tail == '\0') ||
86 ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) {
94 long simple_strtol(const char *cp,char **endp,unsigned int base)
97 return -simple_strtoul(cp+1,endp,base);
98 return simple_strtoul(cp,endp,base);
101 int ustrtoul(const char *cp, char **endp, unsigned int base)
103 unsigned long result = simple_strtoul(cp, endp, base);
114 if ((*endp)[1] == 'i') {
115 if ((*endp)[2] == 'B')
124 unsigned long long simple_strtoull (const char *cp, char **endp, unsigned int base)
126 unsigned long long result = 0, value;
130 if ((*cp == 'x') && isxdigit (cp[1])) {
141 while (isxdigit (*cp) && (value = isdigit (*cp)
143 : (islower (*cp) ? toupper (*cp) : *cp) - 'A' + 10) < base) {
144 result = result * base + value;
152 /* we use this so that we can do without the ctype library */
153 #define is_digit(c) ((c) >= '0' && (c) <= '9')
155 static int skip_atoi(const char **s)
159 while (is_digit(**s))
160 i = i*10 + *((*s)++) - '0';
164 /* Decimal conversion is by far the most typical, and is used
165 * for /proc and /sys data. This directly impacts e.g. top performance
166 * with many processes running. We optimize it for speed
168 * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
169 * (with permission from the author, Douglas W. Jones). */
171 /* Formats correctly any integer in [0,99999].
172 * Outputs from one to five digits depending on input.
173 * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
174 static char* put_dec_trunc(char *buf, unsigned q)
176 unsigned d3, d2, d1, d0;
181 d0 = 6*(d3 + d2 + d1) + (q & 0xf);
182 q = (d0 * 0xcd) >> 11;
184 *buf++ = d0 + '0'; /* least significant digit */
185 d1 = q + 9*d3 + 5*d2 + d1;
187 q = (d1 * 0xcd) >> 11;
189 *buf++ = d1 + '0'; /* next digit */
192 if ((d2 != 0) || (d3 != 0)) {
195 *buf++ = d2 + '0'; /* next digit */
199 q = (d3 * 0xcd) >> 11;
201 *buf++ = d3 + '0'; /* next digit */
203 *buf++ = q + '0'; /* most sign. digit */
209 /* Same with if's removed. Always emits five digits */
210 static char* put_dec_full(char *buf, unsigned q)
212 /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
213 /* but anyway, gcc produces better code with full-sized ints */
214 unsigned d3, d2, d1, d0;
220 * Possible ways to approx. divide by 10
221 * gcc -O2 replaces multiply with shifts and adds
222 * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
223 * (x * 0x67) >> 10: 1100111
224 * (x * 0x34) >> 9: 110100 - same
225 * (x * 0x1a) >> 8: 11010 - same
226 * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386)
229 d0 = 6*(d3 + d2 + d1) + (q & 0xf);
230 q = (d0 * 0xcd) >> 11;
233 d1 = q + 9*d3 + 5*d2 + d1;
234 q = (d1 * 0xcd) >> 11;
244 q = (d3 * 0xcd) >> 11; /* - shorter code */
245 /* q = (d3 * 0x67) >> 10; - would also work */
251 /* No inlining helps gcc to use registers better */
252 static noinline char* put_dec(char *buf, unsigned NUM_TYPE num)
257 return put_dec_trunc(buf, num);
258 rem = do_div(num, 100000);
259 buf = put_dec_full(buf, rem);
263 #define ZEROPAD 1 /* pad with zero */
264 #define SIGN 2 /* unsigned/signed long */
265 #define PLUS 4 /* show plus */
266 #define SPACE 8 /* space if plus */
267 #define LEFT 16 /* left justified */
268 #define SMALL 32 /* Must be 32 == 0x20 */
269 #define SPECIAL 64 /* 0x */
271 #ifdef CONFIG_SYS_VSNPRINTF
273 * Macro to add a new character to our output string, but only if it will
274 * fit. The macro moves to the next character position in the output string.
276 #define ADDCH(str, ch) do { \
282 #define ADDCH(str, ch) (*(str)++ = (ch))
285 static char *number(char *buf, char *end, unsigned NUM_TYPE num,
286 int base, int size, int precision, int type)
288 /* we are called with base 8, 10 or 16, only, thus don't need "G..." */
289 static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
294 int need_pfx = ((type & SPECIAL) && base != 10);
297 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
298 * produces same digits or (maybe lowercased) letters */
299 locase = (type & SMALL);
304 if ((signed NUM_TYPE) num < 0) {
306 num = - (signed NUM_TYPE) num;
308 } else if (type & PLUS) {
311 } else if (type & SPACE) {
322 /* generate full string in tmp[], in reverse order */
326 /* Generic code, for any base:
328 tmp[i++] = (digits[do_div(num,base)] | locase);
331 else if (base != 10) { /* 8 or 16 */
334 if (base == 16) shift = 4;
336 tmp[i++] = (digits[((unsigned char)num) & mask] | locase);
339 } else { /* base 10 */
340 i = put_dec(tmp, num) - tmp;
343 /* printing 100 using %2d gives "100", not "00" */
346 /* leading space padding */
348 if (!(type & (ZEROPAD + LEFT))) {
355 /* "0x" / "0" prefix */
359 ADDCH(buf, 'X' | locase);
361 /* zero or space padding */
362 if (!(type & LEFT)) {
363 char c = (type & ZEROPAD) ? '0' : ' ';
368 /* hmm even more zero padding? */
369 while (i <= --precision)
371 /* actual digits of result */
374 /* trailing space padding */
380 static char *string(char *buf, char *end, char *s, int field_width,
381 int precision, int flags)
388 len = strnlen(s, precision);
391 while (len < field_width--)
393 for (i = 0; i < len; ++i)
395 while (len < field_width--)
400 #ifdef CONFIG_CMD_NET
401 static char *mac_address_string(char *buf, char *end, u8 *addr, int field_width,
402 int precision, int flags)
404 char mac_addr[6 * 3]; /* (6 * 2 hex digits), 5 colons and trailing zero */
408 for (i = 0; i < 6; i++) {
409 p = pack_hex_byte(p, addr[i]);
410 if (!(flags & SPECIAL) && i != 5)
415 return string(buf, end, mac_addr, field_width, precision,
419 static char *ip6_addr_string(char *buf, char *end, u8 *addr, int field_width,
420 int precision, int flags)
422 char ip6_addr[8 * 5]; /* (8 * 4 hex digits), 7 colons and trailing zero */
426 for (i = 0; i < 8; i++) {
427 p = pack_hex_byte(p, addr[2 * i]);
428 p = pack_hex_byte(p, addr[2 * i + 1]);
429 if (!(flags & SPECIAL) && i != 7)
434 return string(buf, end, ip6_addr, field_width, precision,
438 static char *ip4_addr_string(char *buf, char *end, u8 *addr, int field_width,
439 int precision, int flags)
441 char ip4_addr[4 * 4]; /* (4 * 3 decimal digits), 3 dots and trailing zero */
442 char temp[3]; /* hold each IP quad in reverse order */
446 for (i = 0; i < 4; i++) {
447 digits = put_dec_trunc(temp, addr[i]) - temp;
448 /* reverse the digits in the quad */
456 return string(buf, end, ip4_addr, field_width, precision,
462 * Show a '%p' thing. A kernel extension is that the '%p' is followed
463 * by an extra set of alphanumeric characters that are extended format
466 * Right now we handle:
468 * - 'M' For a 6-byte MAC address, it prints the address in the
469 * usual colon-separated hex notation
470 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated
471 * decimal for v4 and colon separated network-order 16 bit hex for v6)
472 * - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is
475 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
476 * function pointers are really function descriptors, which contain a
477 * pointer to the real address.
479 static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
480 int field_width, int precision, int flags)
483 return string(buf, end, "(null)", field_width, precision,
486 #ifdef CONFIG_CMD_NET
492 return mac_address_string(buf, end, ptr, field_width,
499 return ip6_addr_string(buf, end, ptr, field_width,
502 return ip4_addr_string(buf, end, ptr, field_width,
509 if (field_width == -1) {
510 field_width = 2*sizeof(void *);
513 return number(buf, end, (unsigned long)ptr, 16, field_width,
517 static int vsnprintf_internal(char *buf, size_t size, const char *fmt,
520 unsigned NUM_TYPE num;
524 int flags; /* flags to number() */
526 int field_width; /* width of output field */
527 int precision; /* min. # of digits for integers; max
528 number of chars for from string */
529 int qualifier; /* 'h', 'l', or 'L' for integer fields */
530 /* 'z' support added 23/7/1999 S.H. */
531 /* 'z' changed to 'Z' --davidm 1/25/99 */
532 /* 't' added for ptrdiff_t */
533 char *end = buf + size;
535 #ifdef CONFIG_SYS_VSNPRINTF
536 /* Make sure end is always >= buf - do we want this in U-Boot? */
544 for (; *fmt ; ++fmt) {
553 ++fmt; /* this also skips first '%' */
555 case '-': flags |= LEFT; goto repeat;
556 case '+': flags |= PLUS; goto repeat;
557 case ' ': flags |= SPACE; goto repeat;
558 case '#': flags |= SPECIAL; goto repeat;
559 case '0': flags |= ZEROPAD; goto repeat;
562 /* get field width */
565 field_width = skip_atoi(&fmt);
566 else if (*fmt == '*') {
568 /* it's the next argument */
569 field_width = va_arg(args, int);
570 if (field_width < 0) {
571 field_width = -field_width;
576 /* get the precision */
581 precision = skip_atoi(&fmt);
582 else if (*fmt == '*') {
584 /* it's the next argument */
585 precision = va_arg(args, int);
591 /* get the conversion qualifier */
593 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
594 *fmt == 'Z' || *fmt == 'z' || *fmt == 't') {
597 if (qualifier == 'l' && *fmt == 'l') {
608 if (!(flags & LEFT)) {
609 while (--field_width > 0)
612 ADDCH(str, (unsigned char) va_arg(args, int));
613 while (--field_width > 0)
618 str = string(str, end, va_arg(args, char *),
619 field_width, precision, flags);
623 str = pointer(fmt+1, str, end,
624 va_arg(args, void *),
625 field_width, precision, flags);
626 /* Skip all alphanumeric pointer suffixes */
627 while (isalnum(fmt[1]))
632 if (qualifier == 'l') {
633 long * ip = va_arg(args, long *);
636 int * ip = va_arg(args, int *);
645 /* integer number formats - set up the flags and "break" */
670 if (qualifier == 'L') /* "quad" for 64 bit variables */
671 num = va_arg(args, unsigned long long);
672 else if (qualifier == 'l') {
673 num = va_arg(args, unsigned long);
675 num = (signed long) num;
676 } else if (qualifier == 'Z' || qualifier == 'z') {
677 num = va_arg(args, size_t);
678 } else if (qualifier == 't') {
679 num = va_arg(args, ptrdiff_t);
680 } else if (qualifier == 'h') {
681 num = (unsigned short) va_arg(args, int);
683 num = (signed short) num;
685 num = va_arg(args, unsigned int);
687 num = (signed int) num;
689 str = number(str, end, num, base, field_width, precision,
693 #ifdef CONFIG_SYS_VSNPRINTF
702 /* the trailing null byte doesn't count towards the total */
706 #ifdef CONFIG_SYS_VSNPRINTF
707 int vsnprintf(char *buf, size_t size, const char *fmt,
710 return vsnprintf_internal(buf, size, fmt, args);
713 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
717 i = vsnprintf(buf, size, fmt, args);
719 if (likely(i < size))
726 int snprintf(char *buf, size_t size, const char *fmt, ...)
732 i = vsnprintf(buf, size, fmt, args);
738 int scnprintf(char *buf, size_t size, const char *fmt, ...)
744 i = vscnprintf(buf, size, fmt, args);
749 #endif /* CONFIG_SYS_VSNPRINT */
752 * Format a string and place it in a buffer (va_list version)
754 * @param buf The buffer to place the result into
755 * @param fmt The format string to use
756 * @param args Arguments for the format string
758 * The function returns the number of characters written
759 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
762 * If you're not already dealing with a va_list consider using sprintf().
764 int vsprintf(char *buf, const char *fmt, va_list args)
766 return vsnprintf_internal(buf, INT_MAX, fmt, args);
769 int sprintf(char * buf, const char *fmt, ...)
775 i=vsprintf(buf,fmt,args);
780 void panic(const char *fmt, ...)
787 #if defined (CONFIG_PANIC_HANG)
790 udelay (100000); /* allow messages to go out */
791 do_reset (NULL, 0, 0, NULL);
797 void __assert_fail(const char *assertion, const char *file, unsigned line,
798 const char *function)
800 /* This will not return */
801 panic("%s:%u: %s: Assertion `%s' failed.", file, line, function,
805 char *simple_itoa(ulong i)
807 /* 21 digits plus null terminator, good for 64-bit or smaller ints */
808 static char local[22];
809 char *p = &local[21];