source: bootcd/isolinux/syslinux-6.03/memdisk/conio.c

/* ----------------------------------------------------------------------- *
 *
 *   Copyright 2001-2008 H. Peter Anvin - All Rights Reserved
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, Inc., 53 Temple Place Ste 330,
 *   Boston MA 02111-1307, USA; either version 2 of the License, or
 *   (at your option) any later version; incorporated herein by reference.
 *
 * ----------------------------------------------------------------------- */

/*
 * conio.c
 *
 * Output to the screen
 */

#include <stdint.h>
#include "memdisk.h"
#include "conio.h"

int putchar(int ch)
{
    com32sys_t regs;
    memset(&regs, 0, sizeof regs);

    if (ch == '\n') {
        /* \n -> \r\n */
        putchar('\r');
    }

    regs.eax.w[0] = 0x0e00 | (ch & 0xff);
    intcall(0x10, &regs, NULL);

    return ch;
}

int puts(const char *s)
{
    int count = 0;

    while (*s) {
        putchar(*s);
        count++;
        s++;
    }

    return count;
}

/*
 * Oh, it's a waste of space, but oh-so-yummy for debugging.  It's just
 * initialization code anyway, so it doesn't take up space when we're
 * actually running.  This version of printf() does not include 64-bit
 * support.  "Live with it."
 *
 * Most of this code was shamelessly snarfed from the Linux kernel, then
 * modified.
 */

static inline int isdigit(int ch)
{
    return (ch >= '0') && (ch <= '9');
}

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

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

unsigned int atou(const char *s)
{
    unsigned int i = 0;
    while (isdigit(*s))
        i = i * 10 + (*s++ - '0');
    return i;
}

static int strnlen(const char *s, int maxlen)
{
    const char *es = s;
    while (*es && maxlen) {
        es++;
        maxlen--;
    }

    return (es - s);
}

#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 SPECIAL 32              /* 0x */
#define LARGE   64              /* use 'ABCDEF' instead of 'abcdef' */

#define do_div(n,base) ({ \
int __res; \
__res = ((unsigned long) n) % (unsigned) base; \
n = ((unsigned long) n) / (unsigned) base; \
__res; })

static char *number(char *str, long num, int base, int size, int precision,
                    int type)
{
    char c, sign, tmp[66];
    const char *digits = "0123456789abcdef";
    int i;

    if (type & LARGE)
        digits = "0123456789ABCDEF";
    if (type & LEFT)
        type &= ~ZEROPAD;
    if (base < 2 || base > 36)
        return 0;
    c = (type & ZEROPAD) ? '0' : ' ';
    sign = 0;
    if (type & SIGN) {
        if (num < 0) {
            sign = '-';
            num = -num;
            size--;
        } else if (type & PLUS) {
            sign = '+';
            size--;
        } else if (type & SPACE) {
            sign = ' ';
            size--;
        }
    }
    if (type & SPECIAL) {
        if (base == 16)
            size -= 2;
        else if (base == 8)
            size--;
    }
    i = 0;
    if (num == 0)
        tmp[i++] = '0';
    else
        while (num != 0)
            tmp[i++] = digits[do_div(num, base)];
    if (i > precision)
        precision = i;
    size -= precision;
    if (!(type & (ZEROPAD + LEFT)))
        while (size-- > 0)
            *str++ = ' ';
    if (sign)
        *str++ = sign;
    if (type & SPECIAL) {
        if (base == 8)
            *str++ = '0';
        else if (base == 16) {
            *str++ = '0';
            *str++ = digits[33];
        }
    }
    if (!(type & LEFT))
        while (size-- > 0)
            *str++ = c;
    while (i < precision--)
        *str++ = '0';
    while (i-- > 0)
        *str++ = tmp[i];
    while (size-- > 0)
        *str++ = ' ';
    return str;
}

int vsprintf(char *buf, const char *fmt, va_list args)
{
    int len;
    unsigned long num;
    int i, base;
    char *str;
    const char *s;

    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 */

    for (str = buf; *fmt; ++fmt) {
        if (*fmt != '%') {
            *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 (isdigit(*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 (isdigit(*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') {
            qualifier = *fmt;
            ++fmt;
        }

        /* default base */
        base = 10;

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

        case 's':
            s = va_arg(args, char *);
            len = strnlen(s, precision);

            if (!(flags & LEFT))
                while (len < field_width--)
                    *str++ = ' ';
            for (i = 0; i < len; ++i)
                *str++ = *s++;
            while (len < field_width--)
                *str++ = ' ';
            continue;

        case 'p':
            if (field_width == -1) {
                field_width = 2 * sizeof(void *);
                flags |= ZEROPAD;
            }
            str = number(str,
                         (unsigned long)va_arg(args, void *), 16,
                         field_width, precision, flags);
            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 '%':
            *str++ = '%';
            continue;

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

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

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

        default:
            *str++ = '%';
            if (*fmt)
                *str++ = *fmt;
            else
                --fmt;
            continue;
        }
        if (qualifier == 'l')
            num = va_arg(args, unsigned long);
        else if (qualifier == 'h') {
            num = (unsigned short)va_arg(args, int);
            if (flags & SIGN)
                num = (short)num;
        } else if (flags & SIGN)
            num = va_arg(args, int);
        else
            num = va_arg(args, unsigned int);
        str = number(str, num, base, field_width, precision, flags);
    }
    *str = '\0';
    return str - buf;
}

#if 0
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;
}
#endif

int vprintf(const char *fmt, va_list args)
{
    char printf_buf[2048];
    int printed;

    printed = vsprintf(printf_buf, fmt, args);
    puts(printf_buf);
    return printed;
}

int printf(const char *fmt, ...)
{
    va_list args;
    int printed;

    va_start(args, fmt);
    printed = vprintf(fmt, args);
    va_end(args);
    return printed;
}

/*
 * Jump here if all hope is gone...
 */
void __attribute__ ((noreturn)) die(const char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    vprintf(fmt, ap);
    va_end(ap);

    sti();
    for (;;)
        asm volatile("hlt");
}