gyro_board/src/usb/printf-stdarg.c

/*
	Copyright 2001, 2002 Georges Menie (www.menie.org)
	stdarg version contributed by Christian Ettinger

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

/*
	putchar is the only external dependency for this file,
	if you have a working putchar, leave it commented out.
	If not, uncomment the define below and
	replace outbyte(c) by your own function call.

*/

#include <stdarg.h>

int VCOM_putchar(int c);

int putchar (int c)
{
	return VCOM_putchar(c);
}

static void printchar(char **str, int c)
{
        //extern int putchar(int c);

        if (str) {
                **str = (char)c;
                ++(*str);
        } else {
                VCOM_putchar(c);
        }
}

int puts (char * str)
{
	int pc = 1;
	while (*str != 0) {
		VCOM_putchar(*str);
		str ++;
		pc ++;
	}
	VCOM_putchar('\n');
	return pc;
}

#define PAD_RIGHT 1
#define PAD_ZERO 2

static int prints(char **out, const char *string, int width, int pad)
{
        register int pc = 0, padchar = ' ';

        if (width > 0) {
                register int len = 0;
                register const char *ptr;
                for (ptr = string; *ptr; ++ptr) ++len;
                if (len >= width) width = 0;
                else width -= len;
                if (pad & PAD_ZERO) padchar = '0';
        }
        if (!(pad & PAD_RIGHT)) {
                for (; width > 0; --width) {
                        printchar(out, padchar);
                        ++pc;
                }
        }
        for (; *string ; ++string) {
                printchar(out, *string);
                ++pc;
        }
        for (; width > 0; --width) {
                printchar(out, padchar);
                ++pc;
        }

        return pc;
}

/* the following should be enough for 32 bit int */
#define PRINT_BUF_LEN 12

static int printi(char **out, int i, int b, int sg, int width, int pad, int letbase)
{
        char print_buf[PRINT_BUF_LEN];
        register char *s;
        register int t, neg = 0, pc = 0;
        register unsigned int u = (unsigned int)i;

        if (i == 0) {
                print_buf[0] = '0';
                print_buf[1] = '\0';
                return prints(out, print_buf, width, pad);
        }

        if (sg && b == 10 && i < 0) {
                neg = 1;
                u = (unsigned int) - i;
        }

        s = print_buf + PRINT_BUF_LEN - 1;
        *s = '\0';

        while (u) {
                t = (unsigned int)u % b;
                if (t >= 10)
                        t += letbase - '0' - 10;
                *--s = (char)(t + '0');
                u /= b;
        }

        if (neg) {
                if (width && (pad & PAD_ZERO)) {
                        printchar(out, '-');
                        ++pc;
                        --width;
                } else {
                        *--s = '-';
                }
        }

        return pc + prints(out, s, width, pad);
}

static int print(char **out, const char *format, va_list args)
{
        register int width, pad;
        register int pc = 0;
        char scr[2];

        for (; *format != 0; ++format) {
                if (*format == '%') {
                        ++format;
                        width = pad = 0;
                        if (*format == '\0') break;
                        if (*format == '%') goto pout;
                        if (*format == '-') {
                                ++format;
                                pad = PAD_RIGHT;
                        }
                        while (*format == '0') {
                                ++format;
                                pad |= PAD_ZERO;
                        }
                        for (; *format >= '0' && *format <= '9'; ++format) {
                                width *= 10;
                                width += *format - '0';
                        }
                        if (*format == 's') {
                                register char *s = (char *)va_arg(args, int);
                                pc += prints(out, s ? s : "(null)", width, pad);
                                continue;
                        }
                        if (*format == 'd') {
                                pc += printi(out, va_arg(args, int), 10, 1, width, pad, 'a');
                                continue;
                        }
                        if (*format == 'x') {
                                pc += printi(out, va_arg(args, int), 16, 0, width, pad, 'a');
                                continue;
                        }
                        if (*format == 'X') {
                                pc += printi(out, va_arg(args, int), 16, 0, width, pad, 'A');
                                continue;
                        }
                        if (*format == 'u') {
                                pc += printi(out, va_arg(args, int), 10, 0, width, pad, 'a');
                                continue;
                        }
                        if (*format == 'c') {
                                /* char are converted to int then pushed on the stack */
                                scr[0] = (char)va_arg(args, int);
                                scr[1] = '\0';
                                pc += prints(out, scr, width, pad);
                                continue;
                        }
                } else {
pout:
                        printchar(out, *format);
                        ++pc;
                }
        }
        if (out) **out = '\0';
        va_end(args);
        return pc;
}

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

        va_start(args, format);
        return print(0, format, args);
}

int sprintf(char *out, const char *format, ...)
{
        va_list args;

        va_start(args, format);
        return print(&out, format, args);
}


int snprintf(char *buf, unsigned int count, const char *format, ...)
{
        va_list args;

        (void) count;

        va_start(args, format);
        return print(&buf, format, args);
}


#ifdef TEST_PRINTF
int main(void)
{
        char *ptr = "Hello world!";
        char *np = 0;
        int i = 5;
        unsigned int bs = sizeof(int) * 8;
        int mi;
        char buf[80];

        mi = (1 << (bs - 1)) + 1;
        printf("%s\n", ptr);
        printf("printf test\n");
        printf("%s is null pointer\n", np);
        printf("%d = 5\n", i);
        printf("%d = - max int\n", mi);
        printf("char %c = 'a'\n", 'a');
        printf("hex %x = ff\n", 0xff);
        printf("hex %02x = 00\n", 0);
        printf("signed %d = unsigned %u = hex %x\n", -3, -3, -3);
        printf("%d %s(s)%", 0, "message");
        printf("\n");
        printf("%d %s(s) with %%\n", 0, "message");
        sprintf(buf, "justif: \"%-10s\"\n", "left");
        printf("%s", buf);
        sprintf(buf, "justif: \"%10s\"\n", "right");
        printf("%s", buf);
        sprintf(buf, " 3: %04d zero padded\n", 3);
        printf("%s", buf);
        sprintf(buf, " 3: %-4d left justif.\n", 3);
        printf("%s", buf);
        sprintf(buf, " 3: %4d right justif.\n", 3);
        printf("%s", buf);
        sprintf(buf, "-3: %04d zero padded\n", -3);
        printf("%s", buf);
        sprintf(buf, "-3: %-4d left justif.\n", -3);
        printf("%s", buf);
        sprintf(buf, "-3: %4d right justif.\n", -3);
        printf("%s", buf);

        return 0;
}

/*
 * if you compile this file with
 *   gcc -Wall $(YOUR_C_OPTIONS) -DTEST_PRINTF -c printf.c
 * you will get a normal warning:
 *   printf.c:214: warning: spurious trailing `%' in format
 * this line is testing an invalid % at the end of the format string.
 *
 * this should display (on 32bit int machine) :
 *
 * Hello world!
 * printf test
 * (null) is null pointer
 * 5 = 5
 * -2147483647 = - max int
 * char a = 'a'
 * hex ff = ff
 * hex 00 = 00
 * signed -3 = unsigned 4294967293 = hex fffffffd
 * 0 message(s)
 * 0 message(s) with %
 * justif: "left      "
 * justif: "     right"
 *  3: 0003 zero padded
 *  3: 3    left justif.
 *  3:    3 right justif.
 * -3: -003 zero padded
 * -3: -3   left justif.
 * -3:   -3 right justif.
 */

#endif


/* To keep linker happy. */
int	write(int i, char* c, int n)
{
        (void)i;
        (void)n;
        (void)c;
        return 0;
}