arch/powerpc/boot/stdio.c

   1 /*
   2  * Copyright (C) Paul Mackerras 1997.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version
   7  * 2 of the License, or (at your option) any later version.
   8  */
   9 #include <stdarg.h>
  10 #include <stddef.h>
  11 #include "string.h"
  12 #include "stdio.h"
  13 #include "ops.h"
  14
  15 size_t strnlen(const char * s, size_t count)
  16 {
  17         const char *sc;
  18
  19         for (sc = s; count-- && *sc != '\0'; ++sc)
  20                 /* nothing */;
  21         return sc - s;
  22 }
  23
  24 extern unsigned int __div64_32(unsigned long long *dividend,
  25                                unsigned int divisor);
  26
  27 /* The unnecessary pointer compare is there
  28  * to check for type safety (n must be 64bit)
  29  */
  30 # define do_div(n,base) ({                                              \
  31         unsigned int __base = (base);                                   \
  32         unsigned int __rem;                                             \
  33         (void)(((typeof((n)) *)0) == ((unsigned long long *)0));        \
  34         if (((n) >> 32) == 0) {                                         \
  35                 __rem = (unsigned int)(n) % __base;                     \
  36                 (n) = (unsigned int)(n) / __base;                       \
  37         } else                                                          \
  38                 __rem = __div64_32(&(n), __base);                       \
  39         __rem;                                                          \
  40  })
  41
  42 static int skip_atoi(const char **s)
  43 {
  44         int i, c;
  45
  46         for (i = 0; '0' <= (c = **s) && c <= '9'; ++*s)
  47                 i = i*10 + c - '0';
  48         return i;
  49 }
  50
  51 #define ZEROPAD 1               /* pad with zero */
  52 #define SIGN    2               /* unsigned/signed long */
  53 #define PLUS    4               /* show plus */
  54 #define SPACE   8               /* space if plus */
  55 #define LEFT    16              /* left justified */
  56 #define SPECIAL 32              /* 0x */
  57 #define LARGE   64              /* use 'ABCDEF' instead of 'abcdef' */
  58
  59 static char * number(char * str, unsigned long long num, int base, int size, int precision, int type)
  60 {
  61         char c,sign,tmp[66];
  62         const char *digits="0123456789abcdefghijklmnopqrstuvwxyz";
  63         int i;
  64
  65         if (type & LARGE)
  66                 digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
  67         if (type & LEFT)
  68                 type &= ~ZEROPAD;
  69         if (base < 2 || base > 36)
  70                 return 0;
  71         c = (type & ZEROPAD) ? '0' : ' ';
  72         sign = 0;
  73         if (type & SIGN) {
  74                 if ((signed long long)num < 0) {
  75                         sign = '-';
  76                         num = - (signed long long)num;
  77                         size--;
  78                 } else if (type & PLUS) {
  79                         sign = '+';
  80                         size--;
  81                 } else if (type & SPACE) {
  82                         sign = ' ';
  83                         size--;
  84                 }
  85         }
  86         if (type & SPECIAL) {
  87                 if (base == 16)
  88                         size -= 2;
  89                 else if (base == 8)
  90                         size--;
  91         }
  92         i = 0;
  93         if (num == 0)
  94                 tmp[i++]='0';
  95         else while (num != 0) {
  96                 tmp[i++] = digits[do_div(num, base)];
  97         }
  98         if (i > precision)
  99                 precision = i;
 100         size -= precision;
 101         if (!(type&(ZEROPAD+LEFT)))
 102                 while(size-->0)
 103                         *str++ = ' ';
 104         if (sign)
 105                 *str++ = sign;
 106         if (type & SPECIAL) {
 107                 if (base==8)
 108                         *str++ = '0';
 109                 else if (base==16) {
 110                         *str++ = '0';
 111                         *str++ = digits[33];
 112                 }
 113         }
 114         if (!(type & LEFT))
 115                 while (size-- > 0)
 116                         *str++ = c;
 117         while (i < precision--)
 118                 *str++ = '0';
 119         while (i-- > 0)
 120                 *str++ = tmp[i];
 121         while (size-- > 0)
 122                 *str++ = ' ';
 123         return str;
 124 }
 125
 126 int vsprintf(char *buf, const char *fmt, va_list args)
 127 {
 128         int len;
 129         unsigned long long num;
 130         int i, base;
 131         char * str;
 132         const char *s;
 133
 134         int flags;              /* flags to number() */
 135
 136         int field_width;        /* width of output field */
 137         int precision;          /* min. # of digits for integers; max
 138                                    number of chars for from string */
 139         int qualifier;          /* 'h', 'l', or 'L' for integer fields */
 140                                 /* 'z' support added 23/7/1999 S.H.    */
 141                                 /* 'z' changed to 'Z' --davidm 1/25/99 */
 142
 143
 144         for (str=buf ; *fmt ; ++fmt) {
 145                 if (*fmt != '%') {
 146                         *str++ = *fmt;
 147                         continue;
 148                 }
 149
 150                 /* process flags */
 151                 flags = 0;
 152                 repeat:
 153                         ++fmt;          /* this also skips first '%' */
 154                         switch (*fmt) {
 155                                 case '-': flags |= LEFT; goto repeat;
 156                                 case '+': flags |= PLUS; goto repeat;
 157                                 case ' ': flags |= SPACE; goto repeat;
 158                                 case '#': flags |= SPECIAL; goto repeat;
 159                                 case '0': flags |= ZEROPAD; goto repeat;
 160                                 }
 161
 162                 /* get field width */
 163                 field_width = -1;
 164                 if ('0' <= *fmt && *fmt <= '9')
 165                         field_width = skip_atoi(&fmt);
 166                 else if (*fmt == '*') {
 167                         ++fmt;
 168                         /* it's the next argument */
 169                         field_width = va_arg(args, int);
 170                         if (field_width < 0) {
 171                                 field_width = -field_width;
 172                                 flags |= LEFT;
 173                         }
 174                 }
 175
 176                 /* get the precision */
 177                 precision = -1;
 178                 if (*fmt == '.') {
 179                         ++fmt;
 180                         if ('0' <= *fmt && *fmt <= '9')
 181                                 precision = skip_atoi(&fmt);
 182                         else if (*fmt == '*') {
 183                                 ++fmt;
 184                                 /* it's the next argument */
 185                                 precision = va_arg(args, int);
 186                         }
 187                         if (precision < 0)
 188                                 precision = 0;
 189                 }
 190
 191                 /* get the conversion qualifier */
 192                 qualifier = -1;
 193                 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || *fmt =='Z') {
 194                         qualifier = *fmt;
 195                         ++fmt;
 196                 }
 197
 198                 /* default base */
 199                 base = 10;
 200
 201                 switch (*fmt) {
 202                 case 'c':
 203                         if (!(flags & LEFT))
 204                                 while (--field_width > 0)
 205                                         *str++ = ' ';
 206                         *str++ = (unsigned char) va_arg(args, int);
 207                         while (--field_width > 0)
 208                                 *str++ = ' ';
 209                         continue;
 210
 211                 case 's':
 212                         s = va_arg(args, char *);
 213                         if (!s)
 214                                 s = "<NULL>";
 215
 216                         len = strnlen(s, precision);
 217
 218                         if (!(flags & LEFT))
 219                                 while (len < field_width--)
 220                                         *str++ = ' ';
 221                         for (i = 0; i < len; ++i)
 222                                 *str++ = *s++;
 223                         while (len < field_width--)
 224                                 *str++ = ' ';
 225                         continue;
 226
 227                 case 'p':
 228                         if (field_width == -1) {
 229                                 field_width = 2*sizeof(void *);
 230                                 flags |= ZEROPAD;
 231                         }
 232                         str = number(str,
 233                                 (unsigned long) va_arg(args, void *), 16,
 234                                 field_width, precision, flags);
 235                         continue;
 236
 237
 238                 case 'n':
 239                         if (qualifier == 'l') {
 240                                 long * ip = va_arg(args, long *);
 241                                 *ip = (str - buf);
 242                         } else if (qualifier == 'Z') {
 243                                 size_t * ip = va_arg(args, size_t *);
 244                                 *ip = (str - buf);
 245                         } else {
 246                                 int * ip = va_arg(args, int *);
 247                                 *ip = (str - buf);
 248                         }
 249                         continue;
 250
 251                 case '%':
 252                         *str++ = '%';
 253                         continue;
 254
 255                 /* integer number formats - set up the flags and "break" */
 256                 case 'o':
 257                         base = 8;
 258                         break;
 259
 260                 case 'X':
 261                         flags |= LARGE;
 262                 case 'x':
 263                         base = 16;
 264                         break;
 265
 266                 case 'd':
 267                 case 'i':
 268                         flags |= SIGN;
 269                 case 'u':
 270                         break;
 271
 272                 default:
 273                         *str++ = '%';
 274                         if (*fmt)
 275                                 *str++ = *fmt;
 276                         else
 277                                 --fmt;
 278                         continue;
 279                 }
 280                 if (qualifier == 'l') {
 281                         num = va_arg(args, unsigned long);
 282                         if (flags & SIGN)
 283                                 num = (signed long) num;
 284                 } else if (qualifier == 'Z') {
 285                         num = va_arg(args, size_t);
 286                 } else if (qualifier == 'h') {
 287                         num = (unsigned short) va_arg(args, int);
 288                         if (flags & SIGN)
 289                                 num = (signed short) num;
 290                 } else {
 291                         num = va_arg(args, unsigned int);
 292                         if (flags & SIGN)
 293                                 num = (signed int) num;
 294                 }
 295                 str = number(str, num, base, field_width, precision, flags);
 296         }
 297         *str = '\0';
 298         return str-buf;
 299 }
 300
 301 int sprintf(char * buf, const char *fmt, ...)
 302 {
 303         va_list args;
 304         int i;
 305
 306         va_start(args, fmt);
 307         i=vsprintf(buf,fmt,args);
 308         va_end(args);
 309         return i;
 310 }
 311
 312 static char sprint_buf[1024];
 313
 314 int
 315 printf(const char *fmt, ...)
 316 {
 317         va_list args;
 318         int n;
 319
 320         va_start(args, fmt);
 321         n = vsprintf(sprint_buf, fmt, args);
 322         va_end(args);
 323         console_ops.write(sprint_buf, n);
 324         return n;
 325 }