1 /* ----------------------------------------------------------------------- * 2 * 3 * Copyright 2001-2008 H. Peter Anvin - All Rights Reserved 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation, Inc., 53 Temple Place Ste 330, 8 * Boston MA 02111-1307, USA; either version 2 of the License, or 9 * (at your option) any later version; incorporated herein by reference. 10 * 11 * ----------------------------------------------------------------------- */ 12 13 /* 14 * conio.c 15 * 16 * Output to the screen 17 */ 18 19 #include <stdint.h> 20 #include "memdisk.h" 21 #include "conio.h" 22 23 int putchar(int ch) 24 { 25 com32sys_t regs; 26 memset(®s, 0, sizeof regs); 27 28 if (ch == '\n') { 29 /* \n -> \r\n */ 30 putchar('\r'); 31 } 32 33 regs.eax.w[0] = 0x0e00 | (ch & 0xff); 34 intcall(0x10, ®s, NULL); 35 36 return ch; 37 } 38 39 int puts(const char *s) 40 { 41 int count = 0; 42 43 while (*s) { 44 putchar(*s); 45 count++; 46 s++; 47 } 48 49 return count; 50 } 51 52 /* 53 * Oh, it's a waste of space, but oh-so-yummy for debugging. It's just 54 * initialization code anyway, so it doesn't take up space when we're 55 * actually running. This version of printf() does not include 64-bit 56 * support. "Live with it." 57 * 58 * Most of this code was shamelessly snarfed from the Linux kernel, then 59 * modified. 60 */ 61 62 static inline int isdigit(int ch) 63 { 64 return (ch >= '0') && (ch <= '9'); 65 } 66 67 static int skip_atoi(const char **s) 68 { 69 int i = 0; 70 71 while (isdigit(**s)) 72 i = i * 10 + *((*s)++) - '0'; 73 return i; 74 } 75 76 unsigned int atou(const char *s) 77 { 78 unsigned int i = 0; 79 while (isdigit(*s)) 80 i = i * 10 + (*s++ - '0'); 81 return i; 82 } 83 84 static int strnlen(const char *s, int maxlen) 85 { 86 const char *es = s; 87 while (*es && maxlen) { 88 es++; 89 maxlen--; 90 } 91 92 return (es - s); 93 } 94 95 #define ZEROPAD 1 /* pad with zero */ 96 #define SIGN 2 /* unsigned/signed long */ 97 #define PLUS 4 /* show plus */ 98 #define SPACE 8 /* space if plus */ 99 #define LEFT 16 /* left justified */ 100 #define SPECIAL 32 /* 0x */ 101 #define LARGE 64 /* use 'ABCDEF' instead of 'abcdef' */ 102 103 #define do_div(n,base) ({ \ 104 int __res; \ 105 __res = ((unsigned long) n) % (unsigned) base; \ 106 n = ((unsigned long) n) / (unsigned) base; \ 107 __res; }) 108 109 static char *number(char *str, long num, int base, int size, int precision, 110 int type) 111 { 112 char c, sign, tmp[66]; 113 const char *digits = "0123456789abcdef"; 114 int i; 115 116 if (type & LARGE) 117 digits = "0123456789ABCDEF"; 118 if (type & LEFT) 119 type &= ~ZEROPAD; 120 if (base < 2 || base > 36) 121 return 0; 122 c = (type & ZEROPAD) ? '0' : ' '; 123 sign = 0; 124 if (type & SIGN) { 125 if (num < 0) { 126 sign = '-'; 127 num = -num; 128 size--; 129 } else if (type & PLUS) { 130 sign = '+'; 131 size--; 132 } else if (type & SPACE) { 133 sign = ' '; 134 size--; 135 } 136 } 137 if (type & SPECIAL) { 138 if (base == 16) 139 size -= 2; 140 else if (base == 8) 141 size--; 142 } 143 i = 0; 144 if (num == 0) 145 tmp[i++] = '0'; 146 else 147 while (num != 0) 148 tmp[i++] = digits[do_div(num, base)]; 149 if (i > precision) 150 precision = i; 151 size -= precision; 152 if (!(type & (ZEROPAD + LEFT))) 153 while (size-- > 0) 154 *str++ = ' '; 155 if (sign) 156 *str++ = sign; 157 if (type & SPECIAL) { 158 if (base == 8) 159 *str++ = '0'; 160 else if (base == 16) { 161 *str++ = '0'; 162 *str++ = digits[33]; 163 } 164 } 165 if (!(type & LEFT)) 166 while (size-- > 0) 167 *str++ = c; 168 while (i < precision--) 169 *str++ = '0'; 170 while (i-- > 0) 171 *str++ = tmp[i]; 172 while (size-- > 0) 173 *str++ = ' '; 174 return str; 175 } 176 177 int vsprintf(char *buf, const char *fmt, va_list args) 178 { 179 int len; 180 unsigned long num; 181 int i, base; 182 char *str; 183 const char *s; 184 185 int flags; /* flags to number() */ 186 187 int field_width; /* width of output field */ 188 int precision; /* min. # of digits for integers; max 189 number of chars for from string */ 190 int qualifier; /* 'h', 'l', or 'L' for integer fields */ 191 192 for (str = buf; *fmt; ++fmt) { 193 if (*fmt != '%') { 194 *str++ = *fmt; 195 continue; 196 } 197 198 /* process flags */ 199 flags = 0; 200 repeat: 201 ++fmt; /* this also skips first '%' */ 202 switch (*fmt) { 203 case '-': 204 flags |= LEFT; 205 goto repeat; 206 case '+': 207 flags |= PLUS; 208 goto repeat; 209 case ' ': 210 flags |= SPACE; 211 goto repeat; 212 case '#': 213 flags |= SPECIAL; 214 goto repeat; 215 case '0': 216 flags |= ZEROPAD; 217 goto repeat; 218 } 219 220 /* get field width */ 221 field_width = -1; 222 if (isdigit(*fmt)) 223 field_width = skip_atoi(&fmt); 224 else if (*fmt == '*') { 225 ++fmt; 226 /* it's the next argument */ 227 field_width = va_arg(args, int); 228 if (field_width < 0) { 229 field_width = -field_width; 230 flags |= LEFT; 231 } 232 } 233 234 /* get the precision */ 235 precision = -1; 236 if (*fmt == '.') { 237 ++fmt; 238 if (isdigit(*fmt)) 239 precision = skip_atoi(&fmt); 240 else if (*fmt == '*') { 241 ++fmt; 242 /* it's the next argument */ 243 precision = va_arg(args, int); 244 } 245 if (precision < 0) 246 precision = 0; 247 } 248 249 /* get the conversion qualifier */ 250 qualifier = -1; 251 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L') { 252 qualifier = *fmt; 253 ++fmt; 254 } 255 256 /* default base */ 257 base = 10; 258 259 switch (*fmt) { 260 case 'c': 261 if (!(flags & LEFT)) 262 while (--field_width > 0) 263 *str++ = ' '; 264 *str++ = (unsigned char)va_arg(args, int); 265 while (--field_width > 0) 266 *str++ = ' '; 267 continue; 268 269 case 's': 270 s = va_arg(args, char *); 271 len = strnlen(s, precision); 272 273 if (!(flags & LEFT)) 274 while (len < field_width--) 275 *str++ = ' '; 276 for (i = 0; i < len; ++i) 277 *str++ = *s++; 278 while (len < field_width--) 279 *str++ = ' '; 280 continue; 281 282 case 'p': 283 if (field_width == -1) { 284 field_width = 2 * sizeof(void *); 285 flags |= ZEROPAD; 286 } 287 str = number(str, 288 (unsigned long)va_arg(args, void *), 16, 289 field_width, precision, flags); 290 continue; 291 292 case 'n': 293 if (qualifier == 'l') { 294 long *ip = va_arg(args, long *); 295 *ip = (str - buf); 296 } else { 297 int *ip = va_arg(args, int *); 298 *ip = (str - buf); 299 } 300 continue; 301 302 case '%': 303 *str++ = '%'; 304 continue; 305 306 /* integer number formats - set up the flags and "break" */ 307 case 'o': 308 base = 8; 309 break; 310 311 case 'X': 312 flags |= LARGE; 313 case 'x': 314 base = 16; 315 break; 316 317 case 'd': 318 case 'i': 319 flags |= SIGN; 320 case 'u': 321 break; 322 323 default: 324 *str++ = '%'; 325 if (*fmt) 326 *str++ = *fmt; 327 else 328 --fmt; 329 continue; 330 } 331 if (qualifier == 'l') 332 num = va_arg(args, unsigned long); 333 else if (qualifier == 'h') { 334 num = (unsigned short)va_arg(args, int); 335 if (flags & SIGN) 336 num = (short)num; 337 } else if (flags & SIGN) 338 num = va_arg(args, int); 339 else 340 num = va_arg(args, unsigned int); 341 str = number(str, num, base, field_width, precision, flags); 342 } 343 *str = '\0'; 344 return str - buf; 345 } 346 347 #if 0 348 int sprintf(char *buf, const char *fmt, ...) 349 { 350 va_list args; 351 int i; 352 353 va_start(args, fmt); 354 i = vsprintf(buf, fmt, args); 355 va_end(args); 356 return i; 357 } 358 #endif 359 360 int vprintf(const char *fmt, va_list args) 361 { 362 char printf_buf[2048]; 363 int printed; 364 365 printed = vsprintf(printf_buf, fmt, args); 366 puts(printf_buf); 367 return printed; 368 } 369 370 int printf(const char *fmt, ...) 371 { 372 va_list args; 373 int printed; 374 375 va_start(args, fmt); 376 printed = vprintf(fmt, args); 377 va_end(args); 378 return printed; 379 } 380 381 /* 382 * Jump here if all hope is gone... 383 */ 384 void __attribute__ ((noreturn)) die(const char *fmt, ...) 385 { 386 va_list ap; 387 388 va_start(ap, fmt); 389 vprintf(fmt, ap); 390 va_end(ap); 391 392 sti(); 393 for (;;) 394 asm volatile("hlt"); 395 } 396
