lib_generic/vsprintf.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 <linux/types.h>
  14 #include <linux/string.h>
  15 #include <linux/ctype.h>
  16
  17 #include <common.h>
  18 #if !defined (CONFIG_PANIC_HANG)
  19 #include <command.h>
  20 /*cmd_boot.c*/
  21 extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
  22 #endif
  23
  24 unsigned long simple_strtoul(const char *cp,char **endp,unsigned int base)
  25 {
  26         unsigned long result = 0,value;
  27
  28         if (*cp == '0') {
  29                 cp++;
  30                 if ((*cp == 'x') && isxdigit(cp[1])) {
  31                         base = 16;
  32                         cp++;
  33                 }
  34                 if (!base) {
  35                         base = 8;
  36                 }
  37         }
  38         if (!base) {
  39                 base = 10;
  40         }
  41         while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp-'0' : (islower(*cp)
  42             ? toupper(*cp) : *cp)-'A'+10) < base) {
  43                 result = result*base + value;
  44                 cp++;
  45         }
  46         if (endp)
  47                 *endp = (char *)cp;
  48         return result;
  49 }
  50
  51 long simple_strtol(const char *cp,char **endp,unsigned int base)
  52 {
  53         if(*cp=='-')
  54                 return -simple_strtoul(cp+1,endp,base);
  55         return simple_strtoul(cp,endp,base);
  56 }
  57
  58 #ifdef CFG_64BIT_STRTOUL
  59 unsigned long long simple_strtoull (const char *cp, char **endp, unsigned int base)
  60 {
  61         unsigned long long result = 0, value;
  62
  63         if (*cp == '0') {
  64                 cp++;
  65                 if ((*cp == 'x') && isxdigit (cp[1])) {
  66                         base = 16;
  67                         cp++;
  68                 }
  69                 if (!base) {
  70                         base = 8;
  71                 }
  72         }
  73         if (!base) {
  74                 base = 10;
  75         }
  76         while (isxdigit (*cp) && (value = isdigit (*cp)
  77                                 ? *cp - '0'
  78                                 : (islower (*cp) ? toupper (*cp) : *cp) - 'A' + 10) < base) {
  79                 result = result * base + value;
  80                 cp++;
  81         }
  82         if (endp)
  83                 *endp = (char *) cp;
  84         return result;
  85 }
  86 #endif /* CFG_64BIT_STRTOUL */
  87
  88 /* we use this so that we can do without the ctype library */
  89 #define is_digit(c)     ((c) >= '0' && (c) <= '9')
  90
  91 static int skip_atoi(const char **s)
  92 {
  93         int i=0;
  94
  95         while (is_digit(**s))
  96                 i = i*10 + *((*s)++) - '0';
  97         return i;
  98 }
  99
 100 #define ZEROPAD 1               /* pad with zero */
 101 #define SIGN    2               /* unsigned/signed long */
 102 #define PLUS    4               /* show plus */
 103 #define SPACE   8               /* space if plus */
 104 #define LEFT    16              /* left justified */
 105 #define SPECIAL 32              /* 0x */
 106 #define LARGE   64              /* use 'ABCDEF' instead of 'abcdef' */
 107
 108 #ifdef CFG_64BIT_VSPRINTF
 109 #define do_div(n,base) ({ \
 110         unsigned int __res; \
 111         __res = ((unsigned long long) n) % base; \
 112         n = ((unsigned long long) n) / base; \
 113         __res; \
 114 })
 115 #else
 116 #define do_div(n,base) ({ \
 117         int __res; \
 118         __res = ((unsigned long) n) % base; \
 119         n = ((unsigned long) n) / base; \
 120         __res; \
 121 })
 122 #endif
 123
 124 #ifdef CFG_64BIT_VSPRINTF
 125 static char * number(char * str, long long num, unsigned int base, int size, int precision ,int type)
 126 #else
 127 static char * number(char * str, long num, unsigned int base, int size, int precision ,int type)
 128 #endif
 129 {
 130         char c,sign,tmp[66];
 131         const char *digits="0123456789abcdefghijklmnopqrstuvwxyz";
 132         int i;
 133
 134         if (type & LARGE)
 135                 digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
 136         if (type & LEFT)
 137                 type &= ~ZEROPAD;
 138         if (base < 2 || base > 36)
 139                 return 0;
 140         c = (type & ZEROPAD) ? '0' : ' ';
 141         sign = 0;
 142         if (type & SIGN) {
 143                 if (num < 0) {
 144                         sign = '-';
 145                         num = -num;
 146                         size--;
 147                 } else if (type & PLUS) {
 148                         sign = '+';
 149                         size--;
 150                 } else if (type & SPACE) {
 151                         sign = ' ';
 152                         size--;
 153                 }
 154         }
 155         if (type & SPECIAL) {
 156                 if (base == 16)
 157                         size -= 2;
 158                 else if (base == 8)
 159                         size--;
 160         }
 161         i = 0;
 162         if (num == 0)
 163                 tmp[i++]='0';
 164         else while (num != 0)
 165                 tmp[i++] = digits[do_div(num,base)];
 166         if (i > precision)
 167                 precision = i;
 168         size -= precision;
 169         if (!(type&(ZEROPAD+LEFT)))
 170                 while(size-->0)
 171                         *str++ = ' ';
 172         if (sign)
 173                 *str++ = sign;
 174         if (type & SPECIAL) {
 175                 if (base==8)
 176                         *str++ = '0';
 177                 else if (base==16) {
 178                         *str++ = '0';
 179                         *str++ = digits[33];
 180                 }
 181         }
 182         if (!(type & LEFT))
 183                 while (size-- > 0)
 184                         *str++ = c;
 185         while (i < precision--)
 186                 *str++ = '0';
 187         while (i-- > 0)
 188                 *str++ = tmp[i];
 189         while (size-- > 0)
 190                 *str++ = ' ';
 191         return str;
 192 }
 193
 194 /* Forward decl. needed for IP address printing stuff... */
 195 int sprintf(char * buf, const char *fmt, ...);
 196
 197 int vsprintf(char *buf, const char *fmt, va_list args)
 198 {
 199         int len;
 200 #ifdef CFG_64BIT_VSPRINTF
 201         unsigned long long num;
 202 #else
 203         unsigned long num;
 204 #endif
 205         int i, base;
 206         char * str;
 207         const char *s;
 208
 209         int flags;              /* flags to number() */
 210
 211         int field_width;        /* width of output field */
 212         int precision;          /* min. # of digits for integers; max
 213                                    number of chars for from string */
 214         int qualifier;          /* 'h', 'l', or 'q' for integer fields */
 215
 216         for (str=buf ; *fmt ; ++fmt) {
 217                 if (*fmt != '%') {
 218                         *str++ = *fmt;
 219                         continue;
 220                 }
 221
 222                 /* process flags */
 223                 flags = 0;
 224                 repeat:
 225                         ++fmt;          /* this also skips first '%' */
 226                         switch (*fmt) {
 227                                 case '-': flags |= LEFT; goto repeat;
 228                                 case '+': flags |= PLUS; goto repeat;
 229                                 case ' ': flags |= SPACE; goto repeat;
 230                                 case '#': flags |= SPECIAL; goto repeat;
 231                                 case '0': flags |= ZEROPAD; goto repeat;
 232                                 }
 233
 234                 /* get field width */
 235                 field_width = -1;
 236                 if (is_digit(*fmt))
 237                         field_width = skip_atoi(&fmt);
 238                 else if (*fmt == '*') {
 239                         ++fmt;
 240                         /* it's the next argument */
 241                         field_width = va_arg(args, int);
 242                         if (field_width < 0) {
 243                                 field_width = -field_width;
 244                                 flags |= LEFT;
 245                         }
 246                 }
 247
 248                 /* get the precision */
 249                 precision = -1;
 250                 if (*fmt == '.') {
 251                         ++fmt;
 252                         if (is_digit(*fmt))
 253                                 precision = skip_atoi(&fmt);
 254                         else if (*fmt == '*') {
 255                                 ++fmt;
 256                                 /* it's the next argument */
 257                                 precision = va_arg(args, int);
 258                         }
 259                         if (precision < 0)
 260                                 precision = 0;
 261                 }
 262
 263                 /* get the conversion qualifier */
 264                 qualifier = -1;
 265                 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'q') {
 266                         qualifier = *fmt;
 267                         if (qualifier == 'l' && *(fmt+1) == 'l') {
 268                                 qualifier = 'q';
 269                                 ++fmt;
 270                         }
 271                         ++fmt;
 272                 }
 273
 274                 /* default base */
 275                 base = 10;
 276
 277                 switch (*fmt) {
 278                 case 'c':
 279                         if (!(flags & LEFT))
 280                                 while (--field_width > 0)
 281                                         *str++ = ' ';
 282                         *str++ = (unsigned char) va_arg(args, int);
 283                         while (--field_width > 0)
 284                                 *str++ = ' ';
 285                         continue;
 286
 287                 case 's':
 288                         s = va_arg(args, char *);
 289                         if (!s)
 290                                 s = "<NULL>";
 291
 292                         len = strnlen(s, precision);
 293
 294                         if (!(flags & LEFT))
 295                                 while (len < field_width--)
 296                                         *str++ = ' ';
 297                         for (i = 0; i < len; ++i)
 298                                 *str++ = *s++;
 299                         while (len < field_width--)
 300                                 *str++ = ' ';
 301                         continue;
 302
 303                 case 'p':
 304                         if (field_width == -1) {
 305                                 field_width = 2*sizeof(void *);
 306                                 flags |= ZEROPAD;
 307                         }
 308                         str = number(str,
 309                                 (unsigned long) va_arg(args, void *), 16,
 310                                 field_width, precision, flags);
 311                         continue;
 312
 313
 314                 case 'n':
 315                         if (qualifier == 'l') {
 316                                 long * ip = va_arg(args, long *);
 317                                 *ip = (str - buf);
 318                         } else {
 319                                 int * ip = va_arg(args, int *);
 320                                 *ip = (str - buf);
 321                         }
 322                         continue;
 323
 324                 case '%':
 325                         *str++ = '%';
 326                         continue;
 327
 328                 /* integer number formats - set up the flags and "break" */
 329                 case 'o':
 330                         base = 8;
 331                         break;
 332
 333                 case 'X':
 334                         flags |= LARGE;
 335                 case 'x':
 336                         base = 16;
 337                         break;
 338
 339                 case 'd':
 340                 case 'i':
 341                         flags |= SIGN;
 342                 case 'u':
 343                         break;
 344
 345                 default:
 346                         *str++ = '%';
 347                         if (*fmt)
 348                                 *str++ = *fmt;
 349                         else
 350                                 --fmt;
 351                         continue;
 352                 }
 353 #ifdef CFG_64BIT_VSPRINTF
 354                 if (qualifier == 'q')  /* "quad" for 64 bit variables */
 355                         num = va_arg(args, unsigned long long);
 356                 else
 357 #endif
 358                 if (qualifier == 'l')
 359                         num = va_arg(args, unsigned long);
 360                 else if (qualifier == 'h') {
 361                         num = (unsigned short) va_arg(args, int);
 362                         if (flags & SIGN)
 363                                 num = (short) num;
 364                 } else if (flags & SIGN)
 365                         num = va_arg(args, int);
 366                 else
 367                         num = va_arg(args, unsigned int);
 368                 str = number(str, num, base, field_width, precision, flags);
 369         }
 370         *str = '\0';
 371         return str-buf;
 372 }
 373
 374 int sprintf(char * buf, const char *fmt, ...)
 375 {
 376         va_list args;
 377         int i;
 378
 379         va_start(args, fmt);
 380         i=vsprintf(buf,fmt,args);
 381         va_end(args);
 382         return i;
 383 }
 384
 385 void panic(const char *fmt, ...)
 386 {
 387         va_list args;
 388         va_start(args, fmt);
 389         vprintf(fmt, args);
 390         putc('\n');
 391         va_end(args);
 392 #if defined (CONFIG_PANIC_HANG)
 393         hang();
 394 #else
 395         udelay (100000);        /* allow messages to go out */
 396         do_reset (NULL, 0, 0, NULL);
 397 #endif
 398 }