libogc/kprintf.c

   1 /*
   2  *  linux/lib/vsprintf.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  */
   6
   7 /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
   8 /*
   9  * Wirzenius wrote this portably, Torvalds fucked it up :-)
  10  */
  11
  12 #include <stdarg.h>
  13 #include <string.h>
  14 #include <unistd.h>
  15
  16 /* we use this so that we can do without the ctype library */
  17 #define is_digit(c)     ((c) >= '0' && (c) <= '9')
  18
  19 static int skip_atoi(const char **s)
  20 {
  21         int i=0;
  22
  23         while (is_digit(**s))
  24                 i = i*10 + *((*s)++) - '0';
  25         return i;
  26 }
  27
  28 #define ZEROPAD 1               /* pad with zero */
  29 #define SIGN    2               /* unsigned/signed long */
  30 #define PLUS    4               /* show plus */
  31 #define SPACE   8               /* space if plus */
  32 #define LEFT    16              /* left justified */
  33 #define SPECIAL 32              /* 0x */
  34 #define LARGE   64              /* use 'ABCDEF' instead of 'abcdef' */
  35
  36 #define do_div(n,base) ({ \
  37 int __res; \
  38 __res = ((unsigned long) n) % (unsigned) base; \
  39 n = ((unsigned long) n) / (unsigned) base; \
  40 __res; })
  41
  42 static char * number(char * str, long num, int base, int size, int precision
  43         ,int type)
  44 {
  45         char c,sign,tmp[66];
  46         const char *digits="0123456789abcdefghijklmnopqrstuvwxyz";
  47         int i;
  48
  49         if (type & LARGE)
  50                 digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
  51         if (type & LEFT)
  52                 type &= ~ZEROPAD;
  53         if (base < 2 || base > 36)
  54                 return 0;
  55         c = (type & ZEROPAD) ? '0' : ' ';
  56         sign = 0;
  57         if (type & SIGN) {
  58                 if (num < 0) {
  59                         sign = '-';
  60                         num = -num;
  61                         size--;
  62                 } else if (type & PLUS) {
  63                         sign = '+';
  64                         size--;
  65                 } else if (type & SPACE) {
  66                         sign = ' ';
  67                         size--;
  68                 }
  69         }
  70         if (type & SPECIAL) {
  71                 if (base == 16)
  72                         size -= 2;
  73                 else if (base == 8)
  74                         size--;
  75         }
  76         i = 0;
  77         if (num == 0)
  78                 tmp[i++]='0';
  79         else while (num != 0)
  80                 tmp[i++] = digits[do_div(num,base)];
  81         if (i > precision)
  82                 precision = i;
  83         size -= precision;
  84         if (!(type&(ZEROPAD+LEFT)))
  85                 while(size-->0)
  86                         *str++ = ' ';
  87         if (sign)
  88                 *str++ = sign;
  89         if (type & SPECIAL) {
  90                 if (base==8)
  91                         *str++ = '0';
  92                 else if (base==16) {
  93                         *str++ = '0';
  94                         *str++ = digits[33];
  95                 }
  96         }
  97         if (!(type & LEFT))
  98                 while (size-- > 0)
  99                         *str++ = c;
 100         while (i < precision--)
 101                 *str++ = '0';
 102         while (i-- > 0)
 103                 *str++ = tmp[i];
 104         while (size-- > 0)
 105                 *str++ = ' ';
 106         return str;
 107 }
 108
 109 int kvsprintf(char *buf, const char *fmt, va_list args)
 110 {
 111         int len;
 112         unsigned long num;
 113         int i, base;
 114         char * str;
 115         const char *s;
 116
 117         int flags;              /* flags to number() */
 118
 119         int field_width;        /* width of output field */
 120         int precision;          /* min. # of digits for integers; max
 121                                    number of chars for from string */
 122         int qualifier;          /* 'h', 'l', or 'L' for integer fields */
 123
 124         for (str=buf ; *fmt ; ++fmt) {
 125                 if (*fmt != '%') {
 126                         *str++ = *fmt;
 127                         continue;
 128                 }
 129
 130                 /* process flags */
 131                 flags = 0;
 132                 repeat:
 133                         ++fmt;          /* this also skips first '%' */
 134                         switch (*fmt) {
 135                                 case '-': flags |= LEFT; goto repeat;
 136                                 case '+': flags |= PLUS; goto repeat;
 137                                 case ' ': flags |= SPACE; goto repeat;
 138                                 case '#': flags |= SPECIAL; goto repeat;
 139                                 case '0': flags |= ZEROPAD; goto repeat;
 140                                 }
 141
 142                 /* get field width */
 143                 field_width = -1;
 144                 if (is_digit(*fmt))
 145                         field_width = skip_atoi(&fmt);
 146                 else if (*fmt == '*') {
 147                         ++fmt;
 148                         /* it's the next argument */
 149                         field_width = va_arg(args, int);
 150                         if (field_width < 0) {
 151                                 field_width = -field_width;
 152                                 flags |= LEFT;
 153                         }
 154                 }
 155
 156                 /* get the precision */
 157                 precision = -1;
 158                 if (*fmt == '.') {
 159                         ++fmt;
 160                         if (is_digit(*fmt))
 161                                 precision = skip_atoi(&fmt);
 162                         else if (*fmt == '*') {
 163                                 ++fmt;
 164                                 /* it's the next argument */
 165                                 precision = va_arg(args, int);
 166                         }
 167                         if (precision < 0)
 168                                 precision = 0;
 169                 }
 170
 171                 /* get the conversion qualifier */
 172                 qualifier = -1;
 173                 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L') {
 174                         qualifier = *fmt;
 175                         ++fmt;
 176                 }
 177
 178                 /* default base */
 179                 base = 10;
 180
 181                 switch (*fmt) {
 182                 case 'c':
 183                         if (!(flags & LEFT))
 184                                 while (--field_width > 0)
 185                                         *str++ = ' ';
 186                         *str++ = (unsigned char) va_arg(args, int);
 187                         while (--field_width > 0)
 188                                 *str++ = ' ';
 189                         continue;
 190
 191                 case 's':
 192                         s = va_arg(args, char *);
 193                         if (!s)
 194                                 s = "<NULL>";
 195
 196                         len = strnlen(s, precision);
 197
 198                         if (!(flags & LEFT))
 199                                 while (len < field_width--)
 200                                         *str++ = ' ';
 201                         for (i = 0; i < len; ++i)
 202                                 *str++ = *s++;
 203                         while (len < field_width--)
 204                                 *str++ = ' ';
 205                         continue;
 206
 207                 case 'p':
 208                         if (field_width == -1) {
 209                                 field_width = 2*sizeof(void *);
 210                                 flags |= ZEROPAD;
 211                         }
 212                         str = number(str,
 213                                 (unsigned long) va_arg(args, void *), 16,
 214                                 field_width, precision, flags);
 215                         continue;
 216
 217
 218                 case 'n':
 219                         if (qualifier == 'l') {
 220                                 long * ip = va_arg(args, long *);
 221                                 *ip = (str - buf);
 222                         } else {
 223                                 int * ip = va_arg(args, int *);
 224                                 *ip = (str - buf);
 225                         }
 226                         continue;
 227
 228                 case '%':
 229                         *str++ = '%';
 230                         continue;
 231
 232                 /* integer number formats - set up the flags and "break" */
 233                 case 'o':
 234                         base = 8;
 235                         break;
 236
 237                 case 'X':
 238                         flags |= LARGE;
 239                 case 'x':
 240                         base = 16;
 241                         break;
 242
 243                 case 'd':
 244                 case 'i':
 245                         flags |= SIGN;
 246                 case 'u':
 247                         break;
 248
 249                 default:
 250                         *str++ = '%';
 251                         if (*fmt)
 252                                 *str++ = *fmt;
 253                         else
 254                                 --fmt;
 255                         continue;
 256                 }
 257                 if (qualifier == 'l')
 258                         num = va_arg(args, unsigned long);
 259                 else if (qualifier == 'h') {
 260                         num = (unsigned short) va_arg(args, int);
 261                         if (flags & SIGN)
 262                                 num = (short) num;
 263                 } else if (flags & SIGN)
 264                         num = va_arg(args, int);
 265                 else
 266                         num = va_arg(args, unsigned int);
 267                 str = number(str, num, base, field_width, precision, flags);
 268         }
 269         *str = '\0';
 270         return str-buf;
 271 }
 272
 273 #define __DOUTBUFSIZE 256
 274
 275 char __outstr[__DOUTBUFSIZE];
 276
 277 //---------------------------------------------------------------------------------
 278 void kprintf(const char *str, ...)
 279 //---------------------------------------------------------------------------------
 280 {
 281
 282         int len;
 283
 284         va_list args;
 285
 286         va_start(args, str);
 287         len=kvsprintf(__outstr,str,args);
 288         va_end(args);
 289
 290         write(2, __outstr, len);
 291 }