/*
* File: printk.c
* Purpose: The standard C library routine printf(), but without
* all the baggage.
*/
#include "common.h"
#include
/********************************************************************/
typedef struct
{
int dest;
void (*func)(char);
char *loc;
} PRINTK_INFO;
int
printk (PRINTK_INFO *, const char *, va_list);
/********************************************************************/
#define DEST_CONSOLE (1)
#define DEST_STRING (2)
#define FLAGS_MINUS (0x01)
#define FLAGS_PLUS (0x02)
#define FLAGS_SPACE (0x04)
#define FLAGS_ZERO (0x08)
#define FLAGS_POUND (0x10)
#define IS_FLAG_MINUS(a) (a & FLAGS_MINUS)
#define IS_FLAG_PLUS(a) (a & FLAGS_PLUS)
#define IS_FLAG_SPACE(a) (a & FLAGS_SPACE)
#define IS_FLAG_ZERO(a) (a & FLAGS_ZERO)
#define IS_FLAG_POUND(a) (a & FLAGS_POUND)
#define LENMOD_h (0x01)
#define LENMOD_l (0x02)
#define LENMOD_L (0x04)
#define IS_LENMOD_h(a) (a & LENMOD_h)
#define IS_LENMOD_l(a) (a & LENMOD_l)
#define IS_LENMOD_L(a) (a & LENMOD_L)
#define FMT_d (0x0001)
#define FMT_o (0x0002)
#define FMT_x (0x0004)
#define FMT_X (0x0008)
#define FMT_u (0x0010)
#define FMT_c (0x0020)
#define FMT_s (0x0040)
#define FMT_p (0x0080)
#define FMT_n (0x0100)
#define IS_FMT_d(a) (a & FMT_d)
#define IS_FMT_o(a) (a & FMT_o)
#define IS_FMT_x(a) (a & FMT_x)
#define IS_FMT_X(a) (a & FMT_X)
#define IS_FMT_u(a) (a & FMT_u)
#define IS_FMT_c(a) (a & FMT_c)
#define IS_FMT_s(a) (a & FMT_s)
#define IS_FMT_p(a) (a & FMT_p)
#define IS_FMT_n(a) (a & FMT_n)
/********************************************************************/
static void
printk_putc (int c, int *count, PRINTK_INFO *info)
{
switch (info->dest)
{
case DEST_CONSOLE:
info->func((char)c);
break;
case DEST_STRING:
*(info->loc) = (unsigned char)c;
++(info->loc);
break;
default:
break;
}
*count += 1;
}
/********************************************************************/
static int
printk_mknumstr (char *numstr, void *nump, int neg, int radix)
{
int a,b,c;
unsigned int ua,ub,uc;
int nlen;
char *nstrp;
nlen = 0;
nstrp = numstr;
*nstrp++ = '\0';
if (neg)
{
a = *(int *)nump;
if (a == 0)
{
*nstrp = '0';
++nlen;
goto done;
}
while (a != 0)
{
b = (int)a / (int)radix;
c = (int)a - ((int)b * (int)radix);
if (c < 0)
{
c = ~c + 1 + '0';
}
else
{
c = c + '0';
}
a = b;
*nstrp++ = (char)c;
++nlen;
}
}
else
{
ua = *(unsigned int *)nump;
if (ua == 0)
{
*nstrp = '0';
++nlen;
goto done;
}
while (ua != 0)
{
ub = (unsigned int)ua / (unsigned int)radix;
uc = (unsigned int)ua - ((unsigned int)ub * (unsigned int)radix);
if (uc < 10)
{
uc = uc + '0';
}
else
{
uc = uc - 10 + 'A';
}
ua = ub;
*nstrp++ = (char)uc;
++nlen;
}
}
done:
return nlen;
}
/********************************************************************/
static void
printk_pad_zero (int curlen, int field_width, int *count, PRINTK_INFO *info)
{
int i;
for (i = curlen; i < field_width; i++)
{
printk_putc('0',count, info);
}
}
/********************************************************************/
static void
printk_pad_space (int curlen, int field_width, int *count, PRINTK_INFO *info)
{
int i;
for (i = curlen; i < field_width; i++)
{
printk_putc(' ',count, info);
}
}
/********************************************************************/
int
printk (PRINTK_INFO *info, const char *fmt, va_list ap)
{
/* va_list ap; */
char *p;
int c;
char vstr[33];
char *vstrp;
int vlen;
int done;
int count = 0;
int flags_used;
int field_width;
#if 0
int precision_used;
int precision_width;
int length_modifier;
#endif
int ival;
int schar, dschar;
int *ivalp;
char *sval;
int cval;
unsigned int uval;
/*
* Start parsing apart the format string and display appropriate
* formats and data.
*/
for (p = (char *)fmt; (c = *p) != 0; p++)
{
/*
* All formats begin with a '%' marker. Special chars like
* '\n' or '\t' are normally converted to the appropriate
* character by the __compiler__. Thus, no need for this
* routine to account for the '\' character.
*/
if (c != '%')
{
/*
* This needs to be replaced with something like
* 'out_char()' or call an OS routine.
*/
#ifndef UNIX_DEBUG
if (c != '\n')
{
printk_putc(c, &count, info);
}
else
{
printk_putc(0x0D /* CR */, &count, info);
printk_putc(0x0A /* LF */, &count, info);
}
#else
printk_putc(c, &count, info);
#endif
/*
* By using 'continue', the next iteration of the loop
* is used, skipping the code that follows.
*/
continue;
}
/*
* First check for specification modifier flags.
*/
flags_used = 0;
done = FALSE;
while (!done)
{
switch (/* c = */ *++p)
{
case '-':
flags_used |= FLAGS_MINUS;
break;
case '+':
flags_used |= FLAGS_PLUS;
break;
case ' ':
flags_used |= FLAGS_SPACE;
break;
case '0':
flags_used |= FLAGS_ZERO;
break;
case '#':
flags_used |= FLAGS_POUND;
break;
default:
/* we've gone one char too far */
--p;
done = TRUE;
break;
}
}
/*
* Next check for minimum field width.
*/
field_width = 0;
done = FALSE;
while (!done)
{
switch (c = *++p)
{
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
field_width = (field_width * 10) + (c - '0');
break;
default:
/* we've gone one char too far */
--p;
done = TRUE;
break;
}
}
/*
* Next check for the width and precision field separator.
*/
if (/* (c = *++p) */ *++p == '.')
{
/* precision_used = TRUE; */
/*
* Must get precision field width, if present.
*/
/* precision_width = 0; */
done = FALSE;
while (!done)
{
switch (/* c = uncomment if used below */ *++p)
{
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
#if 0
precision_width = (precision_width * 10) +
(c - '0');
#endif
break;
default:
/* we've gone one char too far */
--p;
done = TRUE;
break;
}
}
}
else
{
/* we've gone one char too far */
--p;
#if 0
precision_used = FALSE;
precision_width = 0;
#endif
}
/*
* Check for the length modifier.
*/
/* length_modifier = 0; */
switch (/* c = */ *++p)
{
case 'h':
/* length_modifier |= LENMOD_h; */
break;
case 'l':
/* length_modifier |= LENMOD_l; */
break;
case 'L':
/* length_modifier |= LENMOD_L; */
break;
default:
/* we've gone one char too far */
--p;
break;
}
/*
* Now we're ready to examine the format.
*/
switch (c = *++p)
{
case 'd':
case 'i':
ival = (int)va_arg(ap, int);
vlen = printk_mknumstr(vstr,&ival,TRUE,10);
vstrp = &vstr[vlen];
if (ival < 0)
{
schar = '-';
++vlen;
}
else
{
if (IS_FLAG_PLUS(flags_used))
{
schar = '+';
++vlen;
}
else
{
if (IS_FLAG_SPACE(flags_used))
{
schar = ' ';
++vlen;
}
else
{
schar = 0;
}
}
}
dschar = FALSE;
/*
* do the ZERO pad.
*/
if (IS_FLAG_ZERO(flags_used))
{
if (schar)
printk_putc(schar, &count, info);
dschar = TRUE;
printk_pad_zero (vlen, field_width, &count, info);
vlen = field_width;
}
else
{
if (!IS_FLAG_MINUS(flags_used))
{
printk_pad_space (vlen, field_width, &count, info);
if (schar)
printk_putc(schar, &count, info);
dschar = TRUE;
}
}
/* the string was built in reverse order, now display in */
/* correct order */
if (!dschar && schar)
{
printk_putc(schar, &count, info);
}
goto cont_xd;
case 'x':
case 'X':
uval = (unsigned int)va_arg(ap, unsigned int);
vlen = printk_mknumstr(vstr,&uval,FALSE,16);
vstrp = &vstr[vlen];
dschar = FALSE;
if (IS_FLAG_ZERO(flags_used))
{
if (IS_FLAG_POUND(flags_used))
{
printk_putc('0', &count, info);
printk_putc('x', &count, info);
/*vlen += 2;*/
dschar = TRUE;
}
printk_pad_zero (vlen, field_width, &count, info);
vlen = field_width;
}
else
{
if (!IS_FLAG_MINUS(flags_used))
{
if (IS_FLAG_POUND(flags_used))
{
vlen += 2;
}
printk_pad_space (vlen, field_width, &count, info);
if (IS_FLAG_POUND(flags_used))
{
printk_putc('0', &count, info);
printk_putc('x', &count, info);
dschar = TRUE;
}
}
}
if ((IS_FLAG_POUND(flags_used)) && !dschar)
{
printk_putc('0', &count, info);
printk_putc('x', &count, info);
vlen += 2;
}
goto cont_xd;
case 'o':
uval = (unsigned int)va_arg(ap, unsigned int);
vlen = printk_mknumstr(vstr,&uval,FALSE,8);
goto cont_u;
case 'b':
uval = (unsigned int)va_arg(ap, unsigned int);
vlen = printk_mknumstr(vstr,&uval,FALSE,2);
goto cont_u;
case 'p':
uval = (unsigned int)va_arg(ap, void *);
vlen = printk_mknumstr(vstr,&uval,FALSE,16);
goto cont_u;
case 'u':
uval = (unsigned int)va_arg(ap, unsigned int);
vlen = printk_mknumstr(vstr,&uval,FALSE,10);
cont_u:
vstrp = &vstr[vlen];
if (IS_FLAG_ZERO(flags_used))
{
printk_pad_zero (vlen, field_width, &count, info);
vlen = field_width;
}
else
{
if (!IS_FLAG_MINUS(flags_used))
{
printk_pad_space (vlen, field_width, &count, info);
}
}
cont_xd:
while (*vstrp)
printk_putc(*vstrp--, &count, info);
if (IS_FLAG_MINUS(flags_used))
{
printk_pad_space (vlen, field_width, &count, info);
}
break;
case 'c':
cval = (char)va_arg(ap, unsigned int);
printk_putc(cval,&count, info);
break;
case 's':
sval = (char *)va_arg(ap, char *);
if (sval)
{
vlen = strlen(sval);
if (!IS_FLAG_MINUS(flags_used))
{
printk_pad_space (vlen, field_width, &count, info);
}
while (*sval)
printk_putc(*sval++,&count, info);
if (IS_FLAG_MINUS(flags_used))
{
printk_pad_space (vlen, field_width, &count, info);
}
}
break;
case 'n':
ivalp = (int *)va_arg(ap, int *);
*ivalp = count;
break;
default:
printk_putc(c,&count, info);
break;
}
}
return count;
}
/********************************************************************/
int
printf (const char *fmt, ...)
{
va_list ap;
int rvalue;
PRINTK_INFO info;
info.dest = DEST_CONSOLE;
info.func = &out_char;
/*
* Initialize the pointer to the variable length argument list.
*/
va_start(ap, fmt);
rvalue = printk(&info, fmt, ap);
/*
* Cleanup the variable length argument list.
*/
va_end(ap);
return rvalue;
}
/********************************************************************/
int
sprintf (char *s, const char *fmt, ...)
{
va_list ap;
int rvalue = 0;
PRINTK_INFO info;
/*
* Initialize the pointer to the variable length argument list.
*/
if (s != 0)
{
info.dest = DEST_STRING;
info.loc = s;
va_start(ap, fmt);
rvalue = printk(&info, fmt, ap);
*info.loc = '\0';
va_end(ap);
}
return rvalue;
}
/********************************************************************/
