linux/arch/powerpc/boot/stdio.c
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   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
  24extern 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
  42static 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
  59static 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
 126int 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 == 'l' && *(fmt + 1) == 'l') {
 194                        qualifier = 'q';
 195                        fmt += 2;
 196                } else if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L'
 197                        || *fmt == 'Z') {
 198                        qualifier = *fmt;
 199                        ++fmt;
 200                }
 201
 202                /* default base */
 203                base = 10;
 204
 205                switch (*fmt) {
 206                case 'c':
 207                        if (!(flags & LEFT))
 208                                while (--field_width > 0)
 209                                        *str++ = ' ';
 210                        *str++ = (unsigned char) va_arg(args, int);
 211                        while (--field_width > 0)
 212                                *str++ = ' ';
 213                        continue;
 214
 215                case 's':
 216                        s = va_arg(args, char *);
 217                        if (!s)
 218                                s = "<NULL>";
 219
 220                        len = strnlen(s, precision);
 221
 222                        if (!(flags & LEFT))
 223                                while (len < field_width--)
 224                                        *str++ = ' ';
 225                        for (i = 0; i < len; ++i)
 226                                *str++ = *s++;
 227                        while (len < field_width--)
 228                                *str++ = ' ';
 229                        continue;
 230
 231                case 'p':
 232                        if (field_width == -1) {
 233                                field_width = 2*sizeof(void *);
 234                                flags |= ZEROPAD;
 235                        }
 236                        str = number(str,
 237                                (unsigned long) va_arg(args, void *), 16,
 238                                field_width, precision, flags);
 239                        continue;
 240
 241
 242                case 'n':
 243                        if (qualifier == 'l') {
 244                                long * ip = va_arg(args, long *);
 245                                *ip = (str - buf);
 246                        } else if (qualifier == 'Z') {
 247                                size_t * ip = va_arg(args, size_t *);
 248                                *ip = (str - buf);
 249                        } else {
 250                                int * ip = va_arg(args, int *);
 251                                *ip = (str - buf);
 252                        }
 253                        continue;
 254
 255                case '%':
 256                        *str++ = '%';
 257                        continue;
 258
 259                /* integer number formats - set up the flags and "break" */
 260                case 'o':
 261                        base = 8;
 262                        break;
 263
 264                case 'X':
 265                        flags |= LARGE;
 266                case 'x':
 267                        base = 16;
 268                        break;
 269
 270                case 'd':
 271                case 'i':
 272                        flags |= SIGN;
 273                case 'u':
 274                        break;
 275
 276                default:
 277                        *str++ = '%';
 278                        if (*fmt)
 279                                *str++ = *fmt;
 280                        else
 281                                --fmt;
 282                        continue;
 283                }
 284                if (qualifier == 'l') {
 285                        num = va_arg(args, unsigned long);
 286                        if (flags & SIGN)
 287                                num = (signed long) num;
 288                } else if (qualifier == 'q') {
 289                        num = va_arg(args, unsigned long long);
 290                        if (flags & SIGN)
 291                                num = (signed long long) num;
 292                } else if (qualifier == 'Z') {
 293                        num = va_arg(args, size_t);
 294                } else if (qualifier == 'h') {
 295                        num = (unsigned short) va_arg(args, int);
 296                        if (flags & SIGN)
 297                                num = (signed short) num;
 298                } else {
 299                        num = va_arg(args, unsigned int);
 300                        if (flags & SIGN)
 301                                num = (signed int) num;
 302                }
 303                str = number(str, num, base, field_width, precision, flags);
 304        }
 305        *str = '\0';
 306        return str-buf;
 307}
 308
 309int sprintf(char * buf, const char *fmt, ...)
 310{
 311        va_list args;
 312        int i;
 313
 314        va_start(args, fmt);
 315        i=vsprintf(buf,fmt,args);
 316        va_end(args);
 317        return i;
 318}
 319
 320static char sprint_buf[1024];
 321
 322int
 323printf(const char *fmt, ...)
 324{
 325        va_list args;
 326        int n;
 327
 328        va_start(args, fmt);
 329        n = vsprintf(sprint_buf, fmt, args);
 330        va_end(args);
 331        if (console_ops.write)
 332                console_ops.write(sprint_buf, n);
 333        return n;
 334}
 335
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