printf.c File Reference

#include <stdbool.h>
#include <stdint.h>
#include <stdarg.h>
#include <string.h>
#include <sys/kassert.h>
#include "../dev/console.h"

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Macros
#define	getuint(ap, lflag)
#define	getint(ap, lflag)

Functions
static void	printnum (void(*func)(int, void *), void *handle, uint64_t num, int base, int width, int padc)
int	kvprintf (char const *fmt, void(*func)(int, void *), void *handle, va_list ap)
void	consoleputc (int c, void *handle)
int	kprintf (const char *fmt,...)
void	Debug_Assert (const char *fmt,...)

Variables
static const char *	numberstring_lower = "0123456789abcdef"
static const char *	numberstring_upper = "0123456789ABCDEF"

Macro Definition Documentation

getint

#define getint	(		ap,
			lflag
	)

Value:

    (lflag == 8) ? va_arg(ap, int64_t) : \
    (lflag == 4) ? va_arg(ap, int32_t) : \
    (lflag == 2) ? va_arg(ap, int32_t) : \
    (lflag == 1) ? va_arg(ap, int32_t) : 0

Definition at line 23 of file printf.c.

getuint

#define getuint	(		ap,
			lflag
	)

Value:

    (lflag == 8) ? va_arg(ap, uint64_t) : \
    (lflag == 4) ? va_arg(ap, uint32_t) : \
    (lflag == 2) ? va_arg(ap, uint32_t) : \
    (lflag == 1) ? va_arg(ap, uint32_t) : 0

Definition at line 16 of file printf.c.

Function Documentation

consoleputc()

void consoleputc	(	int	c,
		void *	handle
	)

Definition at line 202 of file printf.c.

{
    if (c == '\n') {
        Console_Putc('\r');
    }
    Console_Putc(c);
}

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Debug_Assert()

void Debug_Assert	(	const char *	fmt,
			...
	)

Definition at line 222 of file printf.c.

{
    va_list ap;
 
    va_start(ap, fmt);
    kvprintf(fmt, consoleputc, 0, ap);
    va_end(ap);
 
#if 0
    kprintf("PC %lx FP %lx\n", __builtin_return_address(0), __builtin_frame_address(0));
    kprintf("PC %lx FP %lx\n", __builtin_return_address(1), __builtin_frame_address(1));
    kprintf("PC %lx FP %lx\n", __builtin_return_address(2), __builtin_frame_address(2));
    kprintf("PC %lx FP %lx\n", __builtin_return_address(3), __builtin_frame_address(3));
    kprintf("PC %lx FP %lx\n", __builtin_return_address(4), __builtin_frame_address(4));
    kprintf("PC %lx FP %lx\n", __builtin_return_address(5), __builtin_frame_address(5));
#endif
   
    Panic("");
}

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kprintf()

int kprintf	(	const char *	fmt,
			...
	)

Definition at line 210 of file printf.c.

{
    int ret;
    va_list ap;
 
    va_start(ap, fmt);
    ret = kvprintf(fmt, consoleputc, 0, ap);
    va_end(ap);
 
    return ret;
}

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kvprintf()

int kvprintf	(	char const *	fmt,
		void(*)(int, void *)	func,
		void *	handle,
		va_list	ap
	)

Definition at line 78 of file printf.c.

{
    const char *p;
    int ch;
    uint64_t unum;
    int64_t num;
    int lflag, width, padc;
 
    while (1) {
        while ((ch = *(unsigned char *)fmt++) != '%') {
            if (ch == '\0') return -1;
            func(ch, handle);
        }
 
        width = -1;
        lflag = 4;
        padc = ' ';
again:
        switch (ch = *(unsigned char *)fmt++) {
            case '-':
                padc = '-';
                goto again;
            case '0':
                padc = '0';
                goto again;
            case '1':
            case '2':
            case '3':
            case '4':
            case '5':
            case '6':
            case '7':
            case '8':
            case '9':
                width = 0;
                while (1) {
                    width = 10 * width + ch - '0';
                    ch = *fmt;
                    if (ch < '0' || ch > '9')
                    {
                        break;
                    }
                    fmt++;
                    if (ch == '\0')
                    {
                        fmt--;
                        goto again;
                    }
                }
                goto again;
            case 'c':
                func(va_arg(ap, int) & 0xff, handle);
                break;
            case 's': {
                int spaces;
 
                p = va_arg(ap, char *);
                ASSERT(p != 0);
                spaces = width - strlen(p);
 
                if (padc == ' ') {
                    while (spaces > 0)
                    {
                        func(' ', handle);
                        spaces--;
                    }
                }
 
                while (*p != '\0')
                {
                    func(*p++, handle);
                }
 
                if (padc == '-') {
                    while (spaces > 0)
                    {
                        func(' ', handle);
                        spaces--;
                    }
                }
                break;
            }
            case 'd':
                num = getint(ap, lflag);
                if (num < 0) {
                    func('-', handle);
                    unum = -num;
                } else {
                    unum = num;
                }
                printnum(func, handle, unum, 10, width, padc);
                break;
            case 'u':
                unum = getuint(ap, lflag);
                printnum(func, handle, unum, 10, width, padc);
                break;
            case 'o':
                unum = getuint(ap, lflag);
                printnum(func, handle, unum, 8, width, padc);
                break;
            case 'p':
                unum = (unsigned long)va_arg(ap, void *);
                printnum(func, handle, unum, 8, width, padc);
                break;
            case 'x':
                unum = getuint(ap, lflag);
                printnum(func, handle, unum, 16, width, padc);
                break;
            case 'X':
                unum = getuint(ap, lflag);
                printnum(func, handle, unum, -16, width, padc);
                break;
            case 'l':
                lflag = 8;
                goto again;
            case '%':
            default: // Print Literally
                func(ch, handle);
                break;
        }
    }
    return 0;
}

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printnum()

static void printnum ( void(*)(int, void *)  func, void *  handle, uint64_t  num, int  base, int  width, int  padc  )

static

Definition at line 32 of file printf.c.

{
    char buf[64];
    char *p = buf;
    int spaces;
    if (base < 0)
    {
        base = -base;
        do {
            *p = numberstring_upper[num % base];
            p++;
        } while (num /= base);
    } else {
        do {
            *p = numberstring_lower[num % base];
            p++;
        } while (num /= base);
    }
 
    // Print spacers (pre-number)
    spaces = width - (p - buf);
    if (padc == ' ' || padc == '0') {
        while (spaces > 0)
        {
            func(padc, handle);
            spaces--;
        }
    }
 
    // Print Number
    while (p != buf) {
        p--;
        func((int)*p, handle);
    }
 
    // Print spacers (post-number)
    if (padc == '-') {
        while (spaces > 0)
        {
            func(' ', handle);
            spaces--;
        }
    }
}

Variable Documentation

numberstring_lower

const char* numberstring_lower = "0123456789abcdef"

static

Definition at line 29 of file printf.c.

numberstring_upper

const char* numberstring_upper = "0123456789ABCDEF"

static

Definition at line 30 of file printf.c.