LXR linux/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
   8size_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
  26static 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
  43static 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
 110int 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
 293int 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}
 303