/*
 *  linux/lib/vsprintf.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 */

/* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
/*
 * Wirzenius wrote this portably, Torvalds fucked it up :-)
 *
 * from hush: simple_itoa() was lifted from boa-0.93.15
 */

#include <stdarg.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/ctype.h>
#include <errno.h>

#include <common.h>
#if !defined (CONFIG_PANIC_HANG)
#include <command.h>
#endif

#include <div64.h>
# define NUM_TYPE long long
#define noinline __attribute__((noinline))

/* some reluctance to put this into a new limits.h, so it is here */
#define INT_MAX         ((int)(~0U>>1))

const char hex_asc[] = "0123456789abcdef";
#define hex_asc_lo(x)   hex_asc[((x) & 0x0f)]
#define hex_asc_hi(x)   hex_asc[((x) & 0xf0) >> 4]

static inline char *pack_hex_byte(char *buf, u8 byte)
{
        *buf++ = hex_asc_hi(byte);
        *buf++ = hex_asc_lo(byte);
        return buf;
}

unsigned long simple_strtoul(const char *cp,char **endp,unsigned int base)
{
        unsigned long result = 0,value;

        if (*cp == '0') {
                cp++;
                if ((*cp == 'x') && isxdigit(cp[1])) {
                        base = 16;
                        cp++;
                }
                if (!base) {
                        base = 8;
                }
        }
        if (!base) {
                base = 10;
        }
        while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp-'0' : (islower(*cp)
            ? toupper(*cp) : *cp)-'A'+10) < base) {
                result = result*base + value;
                cp++;
        }
        if (endp)
                *endp = (char *)cp;
        return result;
}

int strict_strtoul(const char *cp, unsigned int base, unsigned long *res)
{
        char *tail;
        unsigned long val;
        size_t len;

        *res = 0;
        len = strlen(cp);
        if (len == 0)
                return -EINVAL;

        val = simple_strtoul(cp, &tail, base);
        if (tail == cp)
                return -EINVAL;

        if ((*tail == '\0') ||
                ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) {
                *res = val;
                return 0;
        }

        return -EINVAL;
}

long simple_strtol(const char *cp,char **endp,unsigned int base)
{
        if(*cp=='-')
                return -simple_strtoul(cp+1,endp,base);
        return simple_strtoul(cp,endp,base);
}

int ustrtoul(const char *cp, char **endp, unsigned int base)
{
        unsigned long result = simple_strtoul(cp, endp, base);
        switch (**endp) {
        case 'G' :
                result *= 1024;
                /* fall through */
        case 'M':
                result *= 1024;
                /* fall through */
        case 'K':
        case 'k':
                result *= 1024;
                if ((*endp)[1] == 'i') {
                        if ((*endp)[2] == 'B')
                                (*endp) += 3;
                        else
                                (*endp) += 2;
                }
        }
        return result;
}

unsigned long long simple_strtoull (const char *cp, char **endp, unsigned int base)
{
        unsigned long long result = 0, value;

        if (*cp == '0') {
                cp++;
                if ((*cp == 'x') && isxdigit (cp[1])) {
                        base = 16;
                        cp++;
                }
                if (!base) {
                        base = 8;
                }
        }
        if (!base) {
                base = 10;
        }
        while (isxdigit (*cp) && (value = isdigit (*cp)
                                ? *cp - '0'
                                : (islower (*cp) ? toupper (*cp) : *cp) - 'A' + 10) < base) {
                result = result * base + value;
                cp++;
        }
        if (endp)
                *endp = (char *) cp;
        return result;
}

/* we use this so that we can do without the ctype library */
#define is_digit(c)     ((c) >= '0' && (c) <= '9')

static int skip_atoi(const char **s)
{
        int i=0;

        while (is_digit(**s))
                i = i*10 + *((*s)++) - '0';
        return i;
}

/* Decimal conversion is by far the most typical, and is used
 * for /proc and /sys data. This directly impacts e.g. top performance
 * with many processes running. We optimize it for speed
 * using code from
 * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
 * (with permission from the author, Douglas W. Jones). */

/* Formats correctly any integer in [0,99999].
 * Outputs from one to five digits depending on input.
 * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
static char* put_dec_trunc(char *buf, unsigned q)
{
        unsigned d3, d2, d1, d0;
        d1 = (q>>4) & 0xf;
        d2 = (q>>8) & 0xf;
        d3 = (q>>12);

        d0 = 6*(d3 + d2 + d1) + (q & 0xf);
        q = (d0 * 0xcd) >> 11;
        d0 = d0 - 10*q;
        *buf++ = d0 + '0'; /* least significant digit */
        d1 = q + 9*d3 + 5*d2 + d1;
        if (d1 != 0) {
                q = (d1 * 0xcd) >> 11;
                d1 = d1 - 10*q;
                *buf++ = d1 + '0'; /* next digit */

                d2 = q + 2*d2;
                if ((d2 != 0) || (d3 != 0)) {
                        q = (d2 * 0xd) >> 7;
                        d2 = d2 - 10*q;
                        *buf++ = d2 + '0'; /* next digit */

                        d3 = q + 4*d3;
                        if (d3 != 0) {
                                q = (d3 * 0xcd) >> 11;
                                d3 = d3 - 10*q;
                                *buf++ = d3 + '0';  /* next digit */
                                if (q != 0)
                                        *buf++ = q + '0';  /* most sign. digit */
                        }
                }
        }
        return buf;
}
/* Same with if's removed. Always emits five digits */
static char* put_dec_full(char *buf, unsigned q)
{
        /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
        /* but anyway, gcc produces better code with full-sized ints */
        unsigned d3, d2, d1, d0;
        d1 = (q>>4) & 0xf;
        d2 = (q>>8) & 0xf;
        d3 = (q>>12);

        /*
         * Possible ways to approx. divide by 10
         * gcc -O2 replaces multiply with shifts and adds
         * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
         * (x * 0x67) >> 10:  1100111
         * (x * 0x34) >> 9:    110100 - same
         * (x * 0x1a) >> 8:     11010 - same
         * (x * 0x0d) >> 7:      1101 - same, shortest code (on i386)
         */

        d0 = 6*(d3 + d2 + d1) + (q & 0xf);
        q = (d0 * 0xcd) >> 11;
        d0 = d0 - 10*q;
        *buf++ = d0 + '0';
        d1 = q + 9*d3 + 5*d2 + d1;
                q = (d1 * 0xcd) >> 11;
                d1 = d1 - 10*q;
                *buf++ = d1 + '0';

                d2 = q + 2*d2;
                        q = (d2 * 0xd) >> 7;
                        d2 = d2 - 10*q;
                        *buf++ = d2 + '0';

                        d3 = q + 4*d3;
                                q = (d3 * 0xcd) >> 11; /* - shorter code */
                                /* q = (d3 * 0x67) >> 10; - would also work */
                                d3 = d3 - 10*q;
                                *buf++ = d3 + '0';
                                        *buf++ = q + '0';
        return buf;
}
/* No inlining helps gcc to use registers better */
static noinline char* put_dec(char *buf, unsigned NUM_TYPE num)
{
        while (1) {
                unsigned rem;
                if (num < 100000)
                        return put_dec_trunc(buf, num);
                rem = do_div(num, 100000);
                buf = put_dec_full(buf, rem);
        }
}

#define ZEROPAD 1               /* pad with zero */
#define SIGN    2               /* unsigned/signed long */
#define PLUS    4               /* show plus */
#define SPACE   8               /* space if plus */
#define LEFT    16              /* left justified */
#define SMALL   32              /* Must be 32 == 0x20 */
#define SPECIAL 64              /* 0x */

#ifdef CONFIG_SYS_VSNPRINTF
/*
 * Macro to add a new character to our output string, but only if it will
 * fit. The macro moves to the next character position in the output string.
 */
#define ADDCH(str, ch) do { \
        if ((str) < end) \
                *(str) = (ch); \
        ++str; \
        } while (0)
#else
#define ADDCH(str, ch)  (*(str)++ = (ch))
#endif

static char *number(char *buf, char *end, unsigned NUM_TYPE num,
                int base, int size, int precision, int type)
{
        /* we are called with base 8, 10 or 16, only, thus don't need "G..."  */
        static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */

        char tmp[66];
        char sign;
        char locase;
        int need_pfx = ((type & SPECIAL) && base != 10);
        int i;

        /* locase = 0 or 0x20. ORing digits or letters with 'locase'
         * produces same digits or (maybe lowercased) letters */
        locase = (type & SMALL);
        if (type & LEFT)
                type &= ~ZEROPAD;
        sign = 0;
        if (type & SIGN) {
                if ((signed NUM_TYPE) num < 0) {
                        sign = '-';
                        num = - (signed NUM_TYPE) num;
                        size--;
                } else if (type & PLUS) {
                        sign = '+';
                        size--;
                } else if (type & SPACE) {
                        sign = ' ';
                        size--;
                }
        }
        if (need_pfx) {
                size--;
                if (base == 16)
                        size--;
        }

        /* generate full string in tmp[], in reverse order */
        i = 0;
        if (num == 0)
                tmp[i++] = '0';
        /* Generic code, for any base:
        else do {
                tmp[i++] = (digits[do_div(num,base)] | locase);
        } while (num != 0);
        */
        else if (base != 10) { /* 8 or 16 */
                int mask = base - 1;
                int shift = 3;
                if (base == 16) shift = 4;
                do {
                        tmp[i++] = (digits[((unsigned char)num) & mask] | locase);
                        num >>= shift;
                } while (num);
        } else { /* base 10 */
                i = put_dec(tmp, num) - tmp;
        }

        /* printing 100 using %2d gives "100", not "00" */
        if (i > precision)
                precision = i;
        /* leading space padding */
        size -= precision;
        if (!(type & (ZEROPAD + LEFT))) {
                while (--size >= 0)
                        ADDCH(buf, ' ');
        }
        /* sign */
        if (sign)
                ADDCH(buf, sign);
        /* "0x" / "0" prefix */
        if (need_pfx) {
                ADDCH(buf, '0');
                if (base == 16)
                        ADDCH(buf, 'X' | locase);
        }
        /* zero or space padding */
        if (!(type & LEFT)) {
                char c = (type & ZEROPAD) ? '0' : ' ';

                while (--size >= 0)
                        ADDCH(buf, c);
        }
        /* hmm even more zero padding? */
        while (i <= --precision)
                ADDCH(buf, '0');
        /* actual digits of result */
        while (--i >= 0)
                ADDCH(buf, tmp[i]);
        /* trailing space padding */
        while (--size >= 0)
                ADDCH(buf, ' ');
        return buf;
}

static char *string(char *buf, char *end, char *s, int field_width,
                int precision, int flags)
{
        int len, i;

        if (s == 0)
                s = "<NULL>";

        len = strnlen(s, precision);

        if (!(flags & LEFT))
                while (len < field_width--)
                        ADDCH(buf, ' ');
        for (i = 0; i < len; ++i)
                ADDCH(buf, *s++);
        while (len < field_width--)
                ADDCH(buf, ' ');
        return buf;
}

#ifdef CONFIG_CMD_NET
static char *mac_address_string(char *buf, char *end, u8 *addr, int field_width,
                                int precision, int flags)
{
        char mac_addr[6 * 3]; /* (6 * 2 hex digits), 5 colons and trailing zero */
        char *p = mac_addr;
        int i;

        for (i = 0; i < 6; i++) {
                p = pack_hex_byte(p, addr[i]);
                if (!(flags & SPECIAL) && i != 5)
                        *p++ = ':';
        }
        *p = '\0';

        return string(buf, end, mac_addr, field_width, precision,
                      flags & ~SPECIAL);
}

static char *ip6_addr_string(char *buf, char *end, u8 *addr, int field_width,
                         int precision, int flags)
{
        char ip6_addr[8 * 5]; /* (8 * 4 hex digits), 7 colons and trailing zero */
        char *p = ip6_addr;
        int i;

        for (i = 0; i < 8; i++) {
                p = pack_hex_byte(p, addr[2 * i]);
                p = pack_hex_byte(p, addr[2 * i + 1]);
                if (!(flags & SPECIAL) && i != 7)
                        *p++ = ':';
        }
        *p = '\0';

        return string(buf, end, ip6_addr, field_width, precision,
                      flags & ~SPECIAL);
}

static char *ip4_addr_string(char *buf, char *end, u8 *addr, int field_width,
                         int precision, int flags)
{
        char ip4_addr[4 * 4]; /* (4 * 3 decimal digits), 3 dots and trailing zero */
        char temp[3];   /* hold each IP quad in reverse order */
        char *p = ip4_addr;
        int i, digits;

        for (i = 0; i < 4; i++) {
                digits = put_dec_trunc(temp, addr[i]) - temp;
                /* reverse the digits in the quad */
                while (digits--)
                        *p++ = temp[digits];
                if (i != 3)
                        *p++ = '.';
        }
        *p = '\0';

        return string(buf, end, ip4_addr, field_width, precision,
                      flags & ~SPECIAL);
}
#endif

/*
 * Show a '%p' thing.  A kernel extension is that the '%p' is followed
 * by an extra set of alphanumeric characters that are extended format
 * specifiers.
 *
 * Right now we handle:
 *
 * - 'M' For a 6-byte MAC address, it prints the address in the
 *       usual colon-separated hex notation
 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated
 *       decimal for v4 and colon separated network-order 16 bit hex for v6)
 * - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is
 *       currently the same
 *
 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
 * function pointers are really function descriptors, which contain a
 * pointer to the real address.
 */
static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
                int field_width, int precision, int flags)
{
        if (!ptr)
                return string(buf, end, "(null)", field_width, precision,
                              flags);

#ifdef CONFIG_CMD_NET
        switch (*fmt) {
        case 'm':
                flags |= SPECIAL;
                /* Fallthrough */
        case 'M':
                return mac_address_string(buf, end, ptr, field_width,
                                          precision, flags);
        case 'i':
                flags |= SPECIAL;
                /* Fallthrough */
        case 'I':
                if (fmt[1] == '6')
                        return ip6_addr_string(buf, end, ptr, field_width,
                                               precision, flags);
                if (fmt[1] == '4')
                        return ip4_addr_string(buf, end, ptr, field_width,
                                               precision, flags);
                flags &= ~SPECIAL;
                break;
        }
#endif
        flags |= SMALL;
        if (field_width == -1) {
                field_width = 2*sizeof(void *);
                flags |= ZEROPAD;
        }
        return number(buf, end, (unsigned long)ptr, 16, field_width,
                      precision, flags);
}

static int vsnprintf_internal(char *buf, size_t size, const char *fmt,
                              va_list args)
{
        unsigned NUM_TYPE num;
        int base;
        char *str;

        int flags;              /* flags to number() */

        int field_width;        /* width of output field */
        int precision;          /* min. # of digits for integers; max
                                   number of chars for from string */
        int qualifier;          /* 'h', 'l', or 'L' for integer fields */
                                /* 'z' support added 23/7/1999 S.H.    */
                                /* 'z' changed to 'Z' --davidm 1/25/99 */
                                /* 't' added for ptrdiff_t */
        char *end = buf + size;

#ifdef CONFIG_SYS_VSNPRINTF
        /* Make sure end is always >= buf - do we want this in U-Boot? */
        if (end < buf) {
                end = ((void *)-1);
                size = end - buf;
        }
#endif
        str = buf;

        for (; *fmt ; ++fmt) {
                if (*fmt != '%') {
                        ADDCH(str, *fmt);
                        continue;
                }

                /* process flags */
                flags = 0;
                repeat:
                        ++fmt;          /* this also skips first '%' */
                        switch (*fmt) {
                                case '-': flags |= LEFT; goto repeat;
                                case '+': flags |= PLUS; goto repeat;
                                case ' ': flags |= SPACE; goto repeat;
                                case '#': flags |= SPECIAL; goto repeat;
                                case '0': flags |= ZEROPAD; goto repeat;
                        }

                /* get field width */
                field_width = -1;
                if (is_digit(*fmt))
                        field_width = skip_atoi(&fmt);
                else if (*fmt == '*') {
                        ++fmt;
                        /* it's the next argument */
                        field_width = va_arg(args, int);
                        if (field_width < 0) {
                                field_width = -field_width;
                                flags |= LEFT;
                        }
                }

                /* get the precision */
                precision = -1;
                if (*fmt == '.') {
                        ++fmt;
                        if (is_digit(*fmt))
                                precision = skip_atoi(&fmt);
                        else if (*fmt == '*') {
                                ++fmt;
                                /* it's the next argument */
                                precision = va_arg(args, int);
                        }
                        if (precision < 0)
                                precision = 0;
                }

                /* get the conversion qualifier */
                qualifier = -1;
                if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
                    *fmt == 'Z' || *fmt == 'z' || *fmt == 't') {
                        qualifier = *fmt;
                        ++fmt;
                        if (qualifier == 'l' && *fmt == 'l') {
                                qualifier = 'L';
                                ++fmt;
                        }
                }

                /* default base */
                base = 10;

                switch (*fmt) {
                case 'c':
                        if (!(flags & LEFT)) {
                                while (--field_width > 0)
                                        ADDCH(str, ' ');
                        }
                        ADDCH(str, (unsigned char) va_arg(args, int));
                        while (--field_width > 0)
                                ADDCH(str, ' ');
                        continue;

                case 's':
                        str = string(str, end, va_arg(args, char *),
                                     field_width, precision, flags);
                        continue;

                case 'p':
                        str = pointer(fmt+1, str, end,
                                        va_arg(args, void *),
                                        field_width, precision, flags);
                        /* Skip all alphanumeric pointer suffixes */
                        while (isalnum(fmt[1]))
                                fmt++;
                        continue;

                case 'n':
                        if (qualifier == 'l') {
                                long * ip = va_arg(args, long *);
                                *ip = (str - buf);
                        } else {
                                int * ip = va_arg(args, int *);
                                *ip = (str - buf);
                        }
                        continue;

                case '%':
                        ADDCH(str, '%');
                        continue;

                /* integer number formats - set up the flags and "break" */
                case 'o':
                        base = 8;
                        break;

                case 'x':
                        flags |= SMALL;
                case 'X':
                        base = 16;
                        break;

                case 'd':
                case 'i':
                        flags |= SIGN;
                case 'u':
                        break;

                default:
                        ADDCH(str, '%');
                        if (*fmt)
                                ADDCH(str, *fmt);
                        else
                                --fmt;
                        continue;
                }
                if (qualifier == 'L')  /* "quad" for 64 bit variables */
                        num = va_arg(args, unsigned long long);
                else if (qualifier == 'l') {
                        num = va_arg(args, unsigned long);
                        if (flags & SIGN)
                                num = (signed long) num;
                } else if (qualifier == 'Z' || qualifier == 'z') {
                        num = va_arg(args, size_t);
                } else if (qualifier == 't') {
                        num = va_arg(args, ptrdiff_t);
                } else if (qualifier == 'h') {
                        num = (unsigned short) va_arg(args, int);
                        if (flags & SIGN)
                                num = (signed short) num;
                } else {
                        num = va_arg(args, unsigned int);
                        if (flags & SIGN)
                                num = (signed int) num;
                }
                str = number(str, end, num, base, field_width, precision,
                             flags);
        }

#ifdef CONFIG_SYS_VSNPRINTF
        if (size > 0) {
                ADDCH(str, '\0');
                if (str > end)
                        end[-1] = '\0';
        }
#else
        *str = '\0';
#endif
        /* the trailing null byte doesn't count towards the total */
        return str-buf;
}

#ifdef CONFIG_SYS_VSNPRINTF
int vsnprintf(char *buf, size_t size, const char *fmt,
                              va_list args)
{
        return vsnprintf_internal(buf, size, fmt, args);
}

int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
{
        int i;

        i = vsnprintf(buf, size, fmt, args);

        if (likely(i < size))
                return i;
        if (size != 0)
                return size - 1;
        return 0;
}

int snprintf(char *buf, size_t size, const char *fmt, ...)
{
        va_list args;
        int i;

        va_start(args, fmt);
        i = vsnprintf(buf, size, fmt, args);
        va_end(args);

        return i;
}

int scnprintf(char *buf, size_t size, const char *fmt, ...)
{
        va_list args;
        int i;

        va_start(args, fmt);
        i = vscnprintf(buf, size, fmt, args);
        va_end(args);

        return i;
}
#endif /* CONFIG_SYS_VSNPRINT */

/**
 * Format a string and place it in a buffer (va_list version)
 *
 * @param buf   The buffer to place the result into
 * @param fmt   The format string to use
 * @param args  Arguments for the format string
 *
 * The function returns the number of characters written
 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
 * buffer overflows.
 *
 * If you're not already dealing with a va_list consider using sprintf().
 */
int vsprintf(char *buf, const char *fmt, va_list args)
{
        return vsnprintf_internal(buf, INT_MAX, fmt, args);
}

int sprintf(char * buf, const char *fmt, ...)
{
        va_list args;
        int i;

        va_start(args, fmt);
        i=vsprintf(buf,fmt,args);
        va_end(args);
        return i;
}

void panic(const char *fmt, ...)
{
        va_list args;
        va_start(args, fmt);
        vprintf(fmt, args);
        putc('\n');
        va_end(args);
#if defined (CONFIG_PANIC_HANG)
        hang();
#else
        udelay (100000);        /* allow messages to go out */
        do_reset (NULL, 0, 0, NULL);
#endif
        while (1)
                ;
}

void __assert_fail(const char *assertion, const char *file, unsigned line,
                   const char *function)
{
        /* This will not return */
        panic("%s:%u: %s: Assertion `%s' failed.", file, line, function,
              assertion);
}

char *simple_itoa(ulong i)
{
        /* 21 digits plus null terminator, good for 64-bit or smaller ints */
        static char local[22];
        char *p = &local[21];

        *p-- = '\0';
        do {
                *p-- = '0' + i % 10;
                i /= 10;
        } while (i > 0);
        return p + 1;
}