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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 by Gary Czvitkovicz
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
/*
* Minimal printf and snprintf formatting functions
*
* These support %c %s %d and %x
* Field width and zero-padding flag only
*/
#include <stdarg.h>
#include <string.h>
#include <stdbool.h>
#include "file.h" /* for write(), used in fprintf() */
#include "sprintf.h" /* to allow the simulator magic */
static const char hexdigit[] = "0123456789ABCDEF";
static int format(
/* call 'push()' for each output letter */
int (*push)(void *userp, unsigned char data),
void *userp,
const char *fmt,
va_list ap)
{
char *str;
char tmpbuf[12], pad;
int ch, width, val, sign;
long lval;
unsigned int uval;
unsigned long ulval;
bool ok = true;
tmpbuf[sizeof tmpbuf - 1] = '\0';
while ((ch = *fmt++) != '\0' && ok)
{
if (ch == '%')
{
ch = *fmt++;
pad = ' ';
if (ch == '0')
pad = '0';
width = 0;
while (ch >= '0' && ch <= '9')
{
width = 10*width + ch - '0';
ch = *fmt++;
}
str = tmpbuf + sizeof tmpbuf - 1;
switch (ch)
{
case 'c':
*--str = va_arg (ap, int);
break;
case 's':
str = va_arg (ap, char*);
break;
case 'd':
val = sign = va_arg (ap, int);
if (val < 0)
val = -val;
do
{
*--str = (val % 10) + '0';
val /= 10;
}
while (val > 0);
if (sign < 0)
*--str = '-';
break;
case 'x':
case 'X':
uval = va_arg (ap, int);
do
{
*--str = hexdigit[uval & 0xf];
uval >>= 4;
}
while (uval);
break;
case 'l':
ch = *fmt++;
switch(ch) {
case 'x':
case 'X':
ulval = va_arg (ap, long);
do
{
*--str = hexdigit[ulval & 0xf];
ulval >>= 4;
}
while (ulval);
break;
case 'd':
lval = sign = va_arg (ap, long);
if (lval < 0)
lval = -lval;
do
{
*--str = (lval % 10) + '0';
lval /= 10;
}
while (lval > 0);
if (sign < 0)
*--str = '-';
break;
default:
*--str = 'l';
*--str = ch;
}
break;
default:
*--str = ch;
break;
}
if (width > 0)
{
width -= strlen (str);
while (width-- > 0 && ok)
ok=push(userp, pad);
}
while (*str != '\0' && ok)
ok=push(userp, *str++);
}
else
ok=push(userp, ch);
}
return ok; /* true means good */
}
struct for_snprintf {
unsigned char *ptr; /* where to store it */
int bytes; /* amount already stored */
int max; /* max amount to store */
};
static int sprfunc(void *ptr, unsigned char letter)
{
struct for_snprintf *pr = (struct for_snprintf *)ptr;
if(pr->bytes < pr->max) {
*pr->ptr = letter;
pr->ptr++;
pr->bytes++;
return true;
}
return false; /* filled buffer */
}
int snprintf(char *buf, size_t size, const char *fmt, ...)
{
bool ok;
va_list ap;
struct for_snprintf pr;
pr.ptr = buf;
pr.bytes = 0;
pr.max = size;
va_start(ap, fmt);
ok = format(sprfunc, &pr, fmt, ap);
va_end(ap);
/* make sure it ends with a trailing zero */
pr.ptr[(pr.bytes < pr.max) ? 0 : -1] = '\0';
return pr.bytes;
}
int vsnprintf(char *buf, int size, const char *fmt, va_list ap)
{
bool ok;
struct for_snprintf pr;
pr.ptr = buf;
pr.bytes = 0;
pr.max = size;
ok = format(sprfunc, &pr, fmt, ap);
/* make sure it ends with a trailing zero */
pr.ptr[(pr.bytes < pr.max) ? 0 : -1] = '\0';
return pr.bytes;
}
struct for_fprintf {
int fd; /* where to store it */
int bytes; /* amount stored */
};
static int fprfunc(void *pr, unsigned char letter)
{
struct for_fprintf *fpr = (struct for_fprintf *)pr;
int rc = write(fpr->fd, &letter, 1);
if(rc > 0) {
fpr->bytes++; /* count them */
return true; /* we are ok */
}
return false; /* failure */
}
int fprintf(int fd, const char *fmt, ...)
{
bool ok;
va_list ap;
struct for_fprintf fpr;
fpr.fd=fd;
fpr.bytes=0;
va_start(ap, fmt);
ok = format(fprfunc, &fpr, fmt, ap);
va_end(ap);
return fpr.bytes; /* return 0 on error */
}
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