arch/alpha/boot/stdio.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) Paul Mackerras 1997.
   4  */
   5 #include <stdarg.h>
   6 #include <stddef.h>
   7
   8 size_t strnlen(const char * s, size_t count)
   9 {
  10         const char *sc;
  11
  12         for (sc = s; count-- && *sc != '\0'; ++sc)
  13                 /* nothing */;
  14         return sc - s;
  15 }
  16
  17 # define do_div(n, base) ({                                             \
  18         unsigned int __base = (base);                                   \
  19         unsigned int __rem;                                             \
  20         __rem = ((unsigned long long)(n)) % __base;                     \
  21         (n) = ((unsigned long long)(n)) / __base;                       \
  22         __rem;                                                          \
  23 })
  24
  25
  26 static int skip_atoi(const char **s)
  27 {
  28         int i, c;
  29
  30         for (i = 0; '0' <= (c = **s) && c <= '9'; ++*s)
  31                 i = i*10 + c - '0';
  32         return i;
  33 }
  34
  35 #define ZEROPAD 1               /* pad with zero */
  36 #define SIGN    2               /* unsigned/signed long */
  37 #define PLUS    4               /* show plus */
  38 #define SPACE   8               /* space if plus */
  39 #define LEFT    16              /* left justified */
  40 #define SPECIAL 32              /* 0x */
  41 #define LARGE   64              /* use 'ABCDEF' instead of 'abcdef' */
  42
  43 static char * number(char * str, unsigned long long num, int base, int size, int precision, 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 ((signed long long)num < 0) {
  59                         sign = '-';
  60                         num = - (signed long long)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         }
  82         if (i > precision)
  83                 precision = i;
  84         size -= precision;
  85         if (!(type&(ZEROPAD+LEFT)))
  86                 while(size-->0)
  87                         *str++ = ' ';
  88         if (sign)
  89                 *str++ = sign;
  90         if (type & SPECIAL) {
  91                 if (base==8)
  92                         *str++ = '0';
  93                 else if (base==16) {
  94                         *str++ = '0';
  95                         *str++ = digits[33];
  96                 }
  97         }
  98         if (!(type & LEFT))
  99                 while (size-- > 0)
 100                         *str++ = c;
 101         while (i < precision--)
 102                 *str++ = '0';
 103         while (i-- > 0)
 104                 *str++ = tmp[i];
 105         while (size-- > 0)
 106                 *str++ = ' ';
 107         return str;
 108 }
 109
 110 int vsprintf(char *buf, const char *fmt, va_list args)
 111 {
 112         int len;
 113         unsigned long long num;
 114         int i, base;
 115         char * str;
 116         const char *s;
 117
 118         int flags;              /* flags to number() */
 119
 120         int field_width;        /* width of output field */
 121         int precision;          /* min. # of digits for integers; max
 122                                    number of chars for from string */
 123         int qualifier;          /* 'h', 'l', or 'L' for integer fields */
 124                                 /* 'z' support added 23/7/1999 S.H.    */
 125                                 /* 'z' changed to 'Z' --davidm 1/25/99 */
 126
 127
 128         for (str=buf ; *fmt ; ++fmt) {
 129                 if (*fmt != '%') {
 130                         *str++ = *fmt;
 131                         continue;
 132                 }
 133
 134                 /* process flags */
 135                 flags = 0;
 136                 repeat:
 137                         ++fmt;          /* this also skips first '%' */
 138                         switch (*fmt) {
 139                                 case '-': flags |= LEFT; goto repeat;
 140                                 case '+': flags |= PLUS; goto repeat;
 141                                 case ' ': flags |= SPACE; goto repeat;
 142                                 case '#': flags |= SPECIAL; goto repeat;
 143                                 case '0': flags |= ZEROPAD; goto repeat;
 144                                 }
 145
 146                 /* get field width */
 147                 field_width = -1;
 148                 if ('0' <= *fmt && *fmt <= '9')
 149                         field_width = skip_atoi(&fmt);
 150                 else if (*fmt == '*') {
 151                         ++fmt;
 152                         /* it's the next argument */
 153                         field_width = va_arg(args, int);
 154                         if (field_width < 0) {
 155                                 field_width = -field_width;
 156                                 flags |= LEFT;
 157                         }
 158                 }
 159
 160                 /* get the precision */
 161                 precision = -1;
 162                 if (*fmt == '.') {
 163                         ++fmt;
 164                         if ('0' <= *fmt && *fmt <= '9')
 165                                 precision = skip_atoi(&fmt);
 166                         else if (*fmt == '*') {
 167                                 ++fmt;
 168                                 /* it's the next argument */
 169                                 precision = va_arg(args, int);
 170                         }
 171                         if (precision < 0)
 172                                 precision = 0;
 173                 }
 174
 175                 /* get the conversion qualifier */
 176                 qualifier = -1;
 177                 if (*fmt == 'l' && *(fmt + 1) == 'l') {
 178                         qualifier = 'q';
 179                         fmt += 2;
 180                 } else if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L'
 181                         || *fmt == 'Z') {
 182                         qualifier = *fmt;
 183                         ++fmt;
 184                 }
 185
 186                 /* default base */
 187                 base = 10;
 188
 189                 switch (*fmt) {
 190                 case 'c':
 191                         if (!(flags & LEFT))
 192                                 while (--field_width > 0)
 193                                         *str++ = ' ';
 194                         *str++ = (unsigned char) va_arg(args, int);
 195                         while (--field_width > 0)
 196                                 *str++ = ' ';
 197                         continue;
 198
 199                 case 's':
 200                         s = va_arg(args, char *);
 201                         if (!s)
 202                                 s = "<NULL>";
 203
 204                         len = strnlen(s, precision);
 205
 206                         if (!(flags & LEFT))
 207                                 while (len < field_width--)
 208                                         *str++ = ' ';
 209                         for (i = 0; i < len; ++i)
 210                                 *str++ = *s++;
 211                         while (len < field_width--)
 212                                 *str++ = ' ';
 213                         continue;
 214
 215                 case 'p':
 216                         if (field_width == -1) {
 217                                 field_width = 2*sizeof(void *);
 218                                 flags |= ZEROPAD;
 219                         }
 220                         str = number(str,
 221                                 (unsigned long) va_arg(args, void *), 16,
 222                                 field_width, precision, flags);
 223                         continue;
 224
 225
 226                 case 'n':
 227                         if (qualifier == 'l') {
 228                                 long * ip = va_arg(args, long *);
 229                                 *ip = (str - buf);
 230                         } else if (qualifier == 'Z') {
 231                                 size_t * ip = va_arg(args, size_t *);
 232                                 *ip = (str - buf);
 233                         } else {
 234                                 int * ip = va_arg(args, int *);
 235                                 *ip = (str - buf);
 236                         }
 237                         continue;
 238
 239                 case '%':
 240                         *str++ = '%';
 241                         continue;
 242
 243                 /* integer number formats - set up the flags and "break" */
 244                 case 'o':
 245                         base = 8;
 246                         break;
 247
 248                 case 'X':
 249                         flags |= LARGE;
 250                 case 'x':
 251                         base = 16;
 252                         break;
 253
 254                 case 'd':
 255                 case 'i':
 256                         flags |= SIGN;
 257                 case 'u':
 258                         break;
 259
 260                 default:
 261                         *str++ = '%';
 262                         if (*fmt)
 263                                 *str++ = *fmt;
 264                         else
 265                                 --fmt;
 266                         continue;
 267                 }
 268                 if (qualifier == 'l') {
 269                         num = va_arg(args, unsigned long);
 270                         if (flags & SIGN)
 271                                 num = (signed long) num;
 272                 } else if (qualifier == 'q') {
 273                         num = va_arg(args, unsigned long long);
 274                         if (flags & SIGN)
 275                                 num = (signed long long) num;
 276                 } else if (qualifier == 'Z') {
 277                         num = va_arg(args, size_t);
 278                 } else if (qualifier == 'h') {
 279                         num = (unsigned short) va_arg(args, int);
 280                         if (flags & SIGN)
 281                                 num = (signed short) num;
 282                 } else {
 283                         num = va_arg(args, unsigned int);
 284                         if (flags & SIGN)
 285                                 num = (signed int) num;
 286                 }
 287                 str = number(str, num, base, field_width, precision, flags);
 288         }
 289         *str = '\0';
 290         return str-buf;
 291 }
 292
 293 int sprintf(char * buf, const char *fmt, ...)
 294 {
 295         va_list args;
 296         int i;
 297
 298         va_start(args, fmt);
 299         i=vsprintf(buf,fmt,args);
 300         va_end(args);
 301         return i;
 302 }