LXR linux/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
  15size_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#ifdef __powerpc64__
  25
  26# define do_div(n, base) ({                                             \
  27        unsigned int __base = (base);                                   \
  28        unsigned int __rem;                                             \
  29        __rem = ((unsigned long long)(n)) % __base;                     \
  30        (n) = ((unsigned long long)(n)) / __base;                       \
  31        __rem;                                                          \
  32})
  33
  34#else
  35
  36extern unsigned int __div64_32(unsigned long long *dividend,
  37                               unsigned int divisor);
  38
  39/* The unnecessary pointer compare is there
  40 * to check for type safety (n must be 64bit)
  41 */
  42# define do_div(n,base) ({                                              \
  43        unsigned int __base = (base);                                   \
  44        unsigned int __rem;                                             \
  45        (void)(((typeof((n)) *)0) == ((unsigned long long *)0));        \
  46        if (((n) >> 32) == 0) {                                         \
  47                __rem = (unsigned int)(n) % __base;                     \
  48                (n) = (unsigned int)(n) / __base;                       \
  49        } else                                                          \
  50                __rem = __div64_32(&(n), __base);                       \
  51        __rem;                                                          \
  52 })
  53
  54#endif /* __powerpc64__ */
  55
  56static int skip_atoi(const char **s)
  57{
  58        int i, c;
  59
  60        for (i = 0; '0' <= (c = **s) && c <= '9'; ++*s)
  61                i = i*10 + c - '0';
  62        return i;
  63}
  64
  65#define ZEROPAD 1               /* pad with zero */
  66#define SIGN    2               /* unsigned/signed long */
  67#define PLUS    4               /* show plus */
  68#define SPACE   8               /* space if plus */
  69#define LEFT    16              /* left justified */
  70#define SPECIAL 32              /* 0x */
  71#define LARGE   64              /* use 'ABCDEF' instead of 'abcdef' */
  72
  73static char * number(char * str, unsigned long long num, int base, int size, int precision, int type)
  74{
  75        char c,sign,tmp[66];
  76        const char *digits="0123456789abcdefghijklmnopqrstuvwxyz";
  77        int i;
  78
  79        if (type & LARGE)
  80                digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
  81        if (type & LEFT)
  82                type &= ~ZEROPAD;
  83        if (base < 2 || base > 36)
  84                return 0;
  85        c = (type & ZEROPAD) ? '0' : ' ';
  86        sign = 0;
  87        if (type & SIGN) {
  88                if ((signed long long)num < 0) {
  89                        sign = '-';
  90                        num = - (signed long long)num;
  91                        size--;
  92                } else if (type & PLUS) {
  93                        sign = '+';
  94                        size--;
  95                } else if (type & SPACE) {
  96                        sign = ' ';
  97                        size--;
  98                }
  99        }
 100        if (type & SPECIAL) {
 101                if (base == 16)
 102                        size -= 2;
 103                else if (base == 8)
 104                        size--;
 105        }
 106        i = 0;
 107        if (num == 0)
 108                tmp[i++]='0';
 109        else while (num != 0) {
 110                tmp[i++] = digits[do_div(num, base)];
 111        }
 112        if (i > precision)
 113                precision = i;
 114        size -= precision;
 115        if (!(type&(ZEROPAD+LEFT)))
 116                while(size-->0)
 117                        *str++ = ' ';
 118        if (sign)
 119                *str++ = sign;
 120        if (type & SPECIAL) {
 121                if (base==8)
 122                        *str++ = '0';
 123                else if (base==16) {
 124                        *str++ = '0';
 125                        *str++ = digits[33];
 126                }
 127        }
 128        if (!(type & LEFT))
 129                while (size-- > 0)
 130                        *str++ = c;
 131        while (i < precision--)
 132                *str++ = '0';
 133        while (i-- > 0)
 134                *str++ = tmp[i];
 135        while (size-- > 0)
 136                *str++ = ' ';
 137        return str;
 138}
 139
 140int vsprintf(char *buf, const char *fmt, va_list args)
 141{
 142        int len;
 143        unsigned long long num;
 144        int i, base;
 145        char * str;
 146        const char *s;
 147
 148        int flags;              /* flags to number() */
 149
 150        int field_width;        /* width of output field */
 151        int precision;          /* min. # of digits for integers; max
 152                                   number of chars for from string */
 153        int qualifier;          /* 'h', 'l', or 'L' for integer fields */
 154                                /* 'z' support added 23/7/1999 S.H.    */
 155                                /* 'z' changed to 'Z' --davidm 1/25/99 */
 156
 157        
 158        for (str=buf ; *fmt ; ++fmt) {
 159                if (*fmt != '%') {
 160                        *str++ = *fmt;
 161                        continue;
 162                }
 163                        
 164                /* process flags */
 165                flags = 0;
 166                repeat:
 167                        ++fmt;          /* this also skips first '%' */
 168                        switch (*fmt) {
 169                                case '-': flags |= LEFT; goto repeat;
 170                                case '+': flags |= PLUS; goto repeat;
 171                                case ' ': flags |= SPACE; goto repeat;
 172                                case '#': flags |= SPECIAL; goto repeat;
 173                                case '0': flags |= ZEROPAD; goto repeat;
 174                                }
 175                
 176                /* get field width */
 177                field_width = -1;
 178                if ('0' <= *fmt && *fmt <= '9')
 179                        field_width = skip_atoi(&fmt);
 180                else if (*fmt == '*') {
 181                        ++fmt;
 182                        /* it's the next argument */
 183                        field_width = va_arg(args, int);
 184                        if (field_width < 0) {
 185                                field_width = -field_width;
 186                                flags |= LEFT;
 187                        }
 188                }
 189
 190                /* get the precision */
 191                precision = -1;
 192                if (*fmt == '.') {
 193                        ++fmt;  
 194                        if ('0' <= *fmt && *fmt <= '9')
 195                                precision = skip_atoi(&fmt);
 196                        else if (*fmt == '*') {
 197                                ++fmt;
 198                                /* it's the next argument */
 199                                precision = va_arg(args, int);
 200                        }
 201                        if (precision < 0)
 202                                precision = 0;
 203                }
 204
 205                /* get the conversion qualifier */
 206                qualifier = -1;
 207                if (*fmt == 'l' && *(fmt + 1) == 'l') {
 208                        qualifier = 'q';
 209                        fmt += 2;
 210                } else if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L'
 211                        || *fmt == 'Z') {
 212                        qualifier = *fmt;
 213                        ++fmt;
 214                }
 215
 216                /* default base */
 217                base = 10;
 218
 219                switch (*fmt) {
 220                case 'c':
 221                        if (!(flags & LEFT))
 222                                while (--field_width > 0)
 223                                        *str++ = ' ';
 224                        *str++ = (unsigned char) va_arg(args, int);
 225                        while (--field_width > 0)
 226                                *str++ = ' ';
 227                        continue;
 228
 229                case 's':
 230                        s = va_arg(args, char *);
 231                        if (!s)
 232                                s = "<NULL>";
 233
 234                        len = strnlen(s, precision);
 235
 236                        if (!(flags & LEFT))
 237                                while (len < field_width--)
 238                                        *str++ = ' ';
 239                        for (i = 0; i < len; ++i)
 240                                *str++ = *s++;
 241                        while (len < field_width--)
 242                                *str++ = ' ';
 243                        continue;
 244
 245                case 'p':
 246                        if (field_width == -1) {
 247                                field_width = 2*sizeof(void *);
 248                                flags |= ZEROPAD;
 249                        }
 250                        str = number(str,
 251                                (unsigned long) va_arg(args, void *), 16,
 252                                field_width, precision, flags);
 253                        continue;
 254
 255
 256                case 'n':
 257                        if (qualifier == 'l') {
 258                                long * ip = va_arg(args, long *);
 259                                *ip = (str - buf);
 260                        } else if (qualifier == 'Z') {
 261                                size_t * ip = va_arg(args, size_t *);
 262                                *ip = (str - buf);
 263                        } else {
 264                                int * ip = va_arg(args, int *);
 265                                *ip = (str - buf);
 266                        }
 267                        continue;
 268
 269                case '%':
 270                        *str++ = '%';
 271                        continue;
 272
 273                /* integer number formats - set up the flags and "break" */
 274                case 'o':
 275                        base = 8;
 276                        break;
 277
 278                case 'X':
 279                        flags |= LARGE;
 280                case 'x':
 281                        base = 16;
 282                        break;
 283
 284                case 'd':
 285                case 'i':
 286                        flags |= SIGN;
 287                case 'u':
 288                        break;
 289
 290                default:
 291                        *str++ = '%';
 292                        if (*fmt)
 293                                *str++ = *fmt;
 294                        else
 295                                --fmt;
 296                        continue;
 297                }
 298                if (qualifier == 'l') {
 299                        num = va_arg(args, unsigned long);
 300                        if (flags & SIGN)
 301                                num = (signed long) num;
 302                } else if (qualifier == 'q') {
 303                        num = va_arg(args, unsigned long long);
 304                        if (flags & SIGN)
 305                                num = (signed long long) num;
 306                } else if (qualifier == 'Z') {
 307                        num = va_arg(args, size_t);
 308                } else if (qualifier == 'h') {
 309                        num = (unsigned short) va_arg(args, int);
 310                        if (flags & SIGN)
 311                                num = (signed short) num;
 312                } else {
 313                        num = va_arg(args, unsigned int);
 314                        if (flags & SIGN)
 315                                num = (signed int) num;
 316                }
 317                str = number(str, num, base, field_width, precision, flags);
 318        }
 319        *str = '\0';
 320        return str-buf;
 321}
 322
 323int sprintf(char * buf, const char *fmt, ...)
 324{
 325        va_list args;
 326        int i;
 327
 328        va_start(args, fmt);
 329        i=vsprintf(buf,fmt,args);
 330        va_end(args);
 331        return i;
 332}
 333
 334static char sprint_buf[1024];
 335
 336int
 337printf(const char *fmt, ...)
 338{
 339        va_list args;
 340        int n;
 341
 342        va_start(args, fmt);
 343        n = vsprintf(sprint_buf, fmt, args);
 344        va_end(args);
 345        if (console_ops.write)
 346                console_ops.write(sprint_buf, n);
 347        return n;
 348}
 349