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