src/console/vtxprintf.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 /*
   4  * vtxprintf.c, originally from linux/lib/vsprintf.c
   5  */
   6
   7 #include <console/vtxprintf.h>
   8 #include <ctype.h>
   9 #include <string.h>
  10 #include <types.h>
  11
  12 #define call_tx(x) tx_byte(x, data)
  13
  14 #define ZEROPAD 1               /* pad with zero */
  15 #define SIGN    2               /* unsigned/signed long */
  16 #define PLUS    4               /* show plus */
  17 #define SPACE   8               /* space if plus */
  18 #define LEFT    16              /* left justified */
  19 #define SPECIAL 32              /* 0x */
  20 #define LARGE   64              /* use 'ABCDEF' instead of 'abcdef' */
  21
  22 static int number(void (*tx_byte)(unsigned char byte, void *data), unsigned long long inum,
  23                   int base, int size, int precision, int type, void *data)
  24 {
  25         char c, sign, tmp[66];
  26         const char *digits = "0123456789abcdef";
  27         int i;
  28         int count = 0;
  29         unsigned long long num = inum;
  30         long long snum = num;
  31
  32         if (type & LARGE)
  33                 digits = "0123456789ABCDEF";
  34         if (type & LEFT)
  35                 type &= ~ZEROPAD;
  36         c = (type & ZEROPAD) ? '0' : ' ';
  37         sign = 0;
  38         if (type & SIGN) {
  39                 if (snum < 0) {
  40                         sign = '-';
  41                         num = -snum;
  42                         size--;
  43                 } else if (type & PLUS) {
  44                         sign = '+';
  45                         size--;
  46                 } else if (type & SPACE) {
  47                         sign = ' ';
  48                         size--;
  49                 }
  50         }
  51         if (type & SPECIAL) {
  52                 if (base == 16)
  53                         size -= 2;
  54                 else if (base == 8)
  55                         size--;
  56         }
  57         i = 0;
  58         if (num == 0) {
  59                 tmp[i++] = '0';
  60         } else {
  61                 while (num != 0) {
  62                         tmp[i++] = digits[num % base];
  63                         num /= base;
  64                 }
  65         }
  66         if (i > precision) {
  67                 precision = i;
  68         }
  69         size -= precision;
  70         if (!(type & (ZEROPAD | LEFT))) {
  71                 while (size-- > 0)
  72                         call_tx(' '), count++;
  73         }
  74         if (sign) {
  75                 call_tx(sign), count++;
  76         }
  77         if (type & SPECIAL) {
  78                 if (base == 8)
  79                         call_tx('0'), count++;
  80                 else if (base == 16) {
  81                         call_tx('0'), count++;
  82                         if (type & LARGE)
  83                                 call_tx('X'), count++;
  84                         else
  85                                 call_tx('x'), count++;
  86                 }
  87         }
  88         if (!(type & LEFT)) {
  89                 while (size-- > 0)
  90                         call_tx(c), count++;
  91         }
  92         while (i < precision--)
  93                 call_tx('0'), count++;
  94         while (i-- > 0)
  95                 call_tx(tmp[i]), count++;
  96         while (size-- > 0)
  97                 call_tx(' '), count++;
  98         return count;
  99 }
 100
 101 int vtxprintf(void (*tx_byte)(unsigned char byte, void *data), const char *fmt, va_list args,
 102               void *data)
 103 {
 104         int len;
 105         unsigned long long num;
 106         int i, base;
 107         const char *s;
 108
 109         int flags;              /* flags to number() */
 110
 111         int field_width;        /* width of output field */
 112         int precision;          /* min. # of digits for integers; max
 113                                    number of chars for from string */
 114         int qualifier;          /* 'h', 'H', 'l', 'L', 'z', or 'j' for integer fields */
 115
 116         int count;
 117
 118         for (count = 0; *fmt; ++fmt) {
 119                 if (*fmt != '%') {
 120                         call_tx(*fmt), count++;
 121                         continue;
 122                 }
 123
 124                 /* process flags */
 125                 flags = 0;
 126 repeat:
 127                 ++fmt;          /* this also skips first '%' */
 128                 switch (*fmt) {
 129                 case '-': flags |= LEFT; goto repeat;
 130                 case '+': flags |= PLUS; goto repeat;
 131                 case ' ': flags |= SPACE; goto repeat;
 132                 case '#': flags |= SPECIAL; goto repeat;
 133                 case '0': flags |= ZEROPAD; goto repeat;
 134                 }
 135
 136                 /* get field width */
 137                 field_width = -1;
 138                 if (isdigit(*fmt)) {
 139                         field_width = skip_atoi((char **)&fmt);
 140                 } else if (*fmt == '*') {
 141                         ++fmt;
 142                         /* it's the next argument */
 143                         field_width = va_arg(args, int);
 144                         if (field_width < 0) {
 145                                 field_width = -field_width;
 146                                 flags |= LEFT;
 147                         }
 148                 }
 149
 150                 /* get the precision */
 151                 precision = -1;
 152                 if (*fmt == '.') {
 153                         ++fmt;
 154                         if (isdigit(*fmt)) {
 155                                 precision = skip_atoi((char **)&fmt);
 156                         } else if (*fmt == '*') {
 157                                 ++fmt;
 158                                 /* it's the next argument */
 159                                 precision = va_arg(args, int);
 160                         }
 161                         if (precision < 0) {
 162                                 precision = 0;
 163                         }
 164                 }
 165
 166                 /* get the conversion qualifier */
 167                 qualifier = -1;
 168                 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || *fmt == 'z' || *fmt == 'j') {
 169                         qualifier = *fmt;
 170                         ++fmt;
 171                         if (*fmt == 'l') {
 172                                 qualifier = 'L';
 173                                 ++fmt;
 174                         }
 175                         if (*fmt == 'h') {
 176                                 qualifier = 'H';
 177                                 ++fmt;
 178                         }
 179                 }
 180
 181                 /* default base */
 182                 base = 10;
 183
 184                 switch (*fmt) {
 185                 case 'c':
 186                         if (!(flags & LEFT))
 187                                 while (--field_width > 0)
 188                                         call_tx(' '), count++;
 189                         call_tx((unsigned char)va_arg(args, int)), count++;
 190                         while (--field_width > 0)
 191                                 call_tx(' '), count++;
 192                         continue;
 193
 194                 case 's':
 195                         s = va_arg(args, char *);
 196                         if (!s)
 197                                 s = "<NULL>";
 198
 199                         len = strnlen(s, (size_t)precision);
 200
 201                         if (!(flags & LEFT)) {
 202                                 while (len < field_width--)
 203                                         call_tx(' '), count++;
 204                         }
 205                         for (i = 0; i < len; ++i)
 206                                 call_tx(*s++), count++;
 207                         while (len < field_width--)
 208                                 call_tx(' '), count++;
 209                         continue;
 210
 211                 case 'p':
 212                         /* even on 64-bit systems, coreboot only resides in the
 213                            low 4GB so pad pointers to 32-bit for readability. */
 214                         if (field_width == -1 && precision == -1)
 215                                 precision = 2 * sizeof(uint32_t);
 216                         flags |= SPECIAL;
 217                         count += number(tx_byte, (unsigned long)va_arg(args, void *), 16,
 218                                         field_width, precision, flags, data);
 219                         continue;
 220
 221                 case 'n':
 222                         if (qualifier == 'L') {
 223                                 long long *ip = va_arg(args, long long *);
 224                                 *ip = count;
 225                         } else if (qualifier == 'l') {
 226                                 long *ip = va_arg(args, long *);
 227                                 *ip = count;
 228                         } else {
 229                                 int *ip = va_arg(args, int *);
 230                                 *ip = count;
 231                         }
 232                         continue;
 233
 234                 case '%':
 235                         call_tx('%'), count++;
 236                         continue;
 237
 238                 /* integer number formats - set up the flags and "break" */
 239                 case 'o':
 240                         base = 8;
 241                         break;
 242
 243                 case 'X':
 244                         flags |= LARGE;
 245                         __fallthrough;
 246                 case 'x':
 247                         base = 16;
 248                         break;
 249
 250                 case 'd':
 251                 case 'i':
 252                         flags |= SIGN;
 253                         __fallthrough;
 254                 case 'u':
 255                         break;
 256
 257                 default:
 258                         call_tx('%'), count++;
 259                         if (*fmt)
 260                                 call_tx(*fmt), count++;
 261                         else
 262                                 --fmt;
 263                         continue;
 264                 }
 265                 if (qualifier == 'L') {
 266                         num = va_arg(args, unsigned long long);
 267                 } else if (qualifier == 'l') {
 268                         num = va_arg(args, unsigned long);
 269                 } else if (qualifier == 'z') {
 270                         num = va_arg(args, size_t);
 271                 } else if (qualifier == 'j') {
 272                         num = va_arg(args, uintmax_t);
 273                 } else if (qualifier == 'h') {
 274                         num = (unsigned short)va_arg(args, int);
 275                         if (flags & SIGN)
 276                                 num = (short)num;
 277                 } else if (qualifier == 'H') {
 278                         num = (unsigned char)va_arg(args, int);
 279                         if (flags & SIGN)
 280                                 num = (signed char)num;
 281                 } else if (flags & SIGN) {
 282                         num = va_arg(args, int);
 283                 } else {
 284                         num = va_arg(args, unsigned int);
 285                 }
 286                 count += number(tx_byte, num, base, field_width, precision, flags, data);
 287         }
 288         return count;
 289 }