compat/winansi.c

   1 /*
   2  * Copyright 2008 Peter Harris <git@peter.is-a-geek.org>
   3  */
   4
   5 #include "../git-compat-util.h"
   6
   7 /*
   8  Functions to be wrapped:
   9 */
  10 #undef printf
  11 #undef fprintf
  12 #undef fputs
  13 /* TODO: write */
  14
  15 /*
  16  ANSI codes used by git: m, K
  17
  18  This file is git-specific. Therefore, this file does not attempt
  19  to implement any codes that are not used by git.
  20 */
  21
  22 static HANDLE console;
  23 static WORD plain_attr;
  24 static WORD attr;
  25 static int negative;
  26
  27 static void init(void)
  28 {
  29         CONSOLE_SCREEN_BUFFER_INFO sbi;
  30
  31         static int initialized = 0;
  32         if (initialized)
  33                 return;
  34
  35         console = GetStdHandle(STD_OUTPUT_HANDLE);
  36         if (console == INVALID_HANDLE_VALUE)
  37                 console = NULL;
  38
  39         if (!console)
  40                 return;
  41
  42         GetConsoleScreenBufferInfo(console, &sbi);
  43         attr = plain_attr = sbi.wAttributes;
  44         negative = 0;
  45
  46         initialized = 1;
  47 }
  48
  49
  50 #define FOREGROUND_ALL (FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE)
  51 #define BACKGROUND_ALL (BACKGROUND_RED | BACKGROUND_GREEN | BACKGROUND_BLUE)
  52
  53 static void set_console_attr(void)
  54 {
  55         WORD attributes = attr;
  56         if (negative) {
  57                 attributes &= ~FOREGROUND_ALL;
  58                 attributes &= ~BACKGROUND_ALL;
  59
  60                 /* This could probably use a bitmask
  61                    instead of a series of ifs */
  62                 if (attr & FOREGROUND_RED)
  63                         attributes |= BACKGROUND_RED;
  64                 if (attr & FOREGROUND_GREEN)
  65                         attributes |= BACKGROUND_GREEN;
  66                 if (attr & FOREGROUND_BLUE)
  67                         attributes |= BACKGROUND_BLUE;
  68
  69                 if (attr & BACKGROUND_RED)
  70                         attributes |= FOREGROUND_RED;
  71                 if (attr & BACKGROUND_GREEN)
  72                         attributes |= FOREGROUND_GREEN;
  73                 if (attr & BACKGROUND_BLUE)
  74                         attributes |= FOREGROUND_BLUE;
  75         }
  76         SetConsoleTextAttribute(console, attributes);
  77 }
  78
  79 static void erase_in_line(void)
  80 {
  81         CONSOLE_SCREEN_BUFFER_INFO sbi;
  82         DWORD dummy; /* Needed for Windows 7 (or Vista) regression */
  83
  84         if (!console)
  85                 return;
  86
  87         GetConsoleScreenBufferInfo(console, &sbi);
  88         FillConsoleOutputCharacterA(console, ' ',
  89                 sbi.dwSize.X - sbi.dwCursorPosition.X, sbi.dwCursorPosition,
  90                 &dummy);
  91 }
  92
  93
  94 static const char *set_attr(const char *str)
  95 {
  96         const char *func;
  97         size_t len = strspn(str, "0123456789;");
  98         func = str + len;
  99
 100         switch (*func) {
 101         case 'm':
 102                 do {
 103                         long val = strtol(str, (char **)&str, 10);
 104                         switch (val) {
 105                         case 0: /* reset */
 106                                 attr = plain_attr;
 107                                 negative = 0;
 108                                 break;
 109                         case 1: /* bold */
 110                                 attr |= FOREGROUND_INTENSITY;
 111                                 break;
 112                         case 2:  /* faint */
 113                         case 22: /* normal */
 114                                 attr &= ~FOREGROUND_INTENSITY;
 115                                 break;
 116                         case 3:  /* italic */
 117                                 /* Unsupported */
 118                                 break;
 119                         case 4:  /* underline */
 120                         case 21: /* double underline */
 121                                 /* Wikipedia says this flag does nothing */
 122                                 /* Furthermore, mingw doesn't define this flag
 123                                 attr |= COMMON_LVB_UNDERSCORE; */
 124                                 break;
 125                         case 24: /* no underline */
 126                                 /* attr &= ~COMMON_LVB_UNDERSCORE; */
 127                                 break;
 128                         case 5:  /* slow blink */
 129                         case 6:  /* fast blink */
 130                                 /* We don't have blink, but we do have
 131                                    background intensity */
 132                                 attr |= BACKGROUND_INTENSITY;
 133                                 break;
 134                         case 25: /* no blink */
 135                                 attr &= ~BACKGROUND_INTENSITY;
 136                                 break;
 137                         case 7:  /* negative */
 138                                 negative = 1;
 139                                 break;
 140                         case 27: /* positive */
 141                                 negative = 0;
 142                                 break;
 143                         case 8:  /* conceal */
 144                         case 28: /* reveal */
 145                                 /* Unsupported */
 146                                 break;
 147                         case 30: /* Black */
 148                                 attr &= ~FOREGROUND_ALL;
 149                                 break;
 150                         case 31: /* Red */
 151                                 attr &= ~FOREGROUND_ALL;
 152                                 attr |= FOREGROUND_RED;
 153                                 break;
 154                         case 32: /* Green */
 155                                 attr &= ~FOREGROUND_ALL;
 156                                 attr |= FOREGROUND_GREEN;
 157                                 break;
 158                         case 33: /* Yellow */
 159                                 attr &= ~FOREGROUND_ALL;
 160                                 attr |= FOREGROUND_RED | FOREGROUND_GREEN;
 161                                 break;
 162                         case 34: /* Blue */
 163                                 attr &= ~FOREGROUND_ALL;
 164                                 attr |= FOREGROUND_BLUE;
 165                                 break;
 166                         case 35: /* Magenta */
 167                                 attr &= ~FOREGROUND_ALL;
 168                                 attr |= FOREGROUND_RED | FOREGROUND_BLUE;
 169                                 break;
 170                         case 36: /* Cyan */
 171                                 attr &= ~FOREGROUND_ALL;
 172                                 attr |= FOREGROUND_GREEN | FOREGROUND_BLUE;
 173                                 break;
 174                         case 37: /* White */
 175                                 attr |= FOREGROUND_RED |
 176                                         FOREGROUND_GREEN |
 177                                         FOREGROUND_BLUE;
 178                                 break;
 179                         case 38: /* Unknown */
 180                                 break;
 181                         case 39: /* reset */
 182                                 attr &= ~FOREGROUND_ALL;
 183                                 attr |= (plain_attr & FOREGROUND_ALL);
 184                                 break;
 185                         case 40: /* Black */
 186                                 attr &= ~BACKGROUND_ALL;
 187                                 break;
 188                         case 41: /* Red */
 189                                 attr &= ~BACKGROUND_ALL;
 190                                 attr |= BACKGROUND_RED;
 191                                 break;
 192                         case 42: /* Green */
 193                                 attr &= ~BACKGROUND_ALL;
 194                                 attr |= BACKGROUND_GREEN;
 195                                 break;
 196                         case 43: /* Yellow */
 197                                 attr &= ~BACKGROUND_ALL;
 198                                 attr |= BACKGROUND_RED | BACKGROUND_GREEN;
 199                                 break;
 200                         case 44: /* Blue */
 201                                 attr &= ~BACKGROUND_ALL;
 202                                 attr |= BACKGROUND_BLUE;
 203                                 break;
 204                         case 45: /* Magenta */
 205                                 attr &= ~BACKGROUND_ALL;
 206                                 attr |= BACKGROUND_RED | BACKGROUND_BLUE;
 207                                 break;
 208                         case 46: /* Cyan */
 209                                 attr &= ~BACKGROUND_ALL;
 210                                 attr |= BACKGROUND_GREEN | BACKGROUND_BLUE;
 211                                 break;
 212                         case 47: /* White */
 213                                 attr |= BACKGROUND_RED |
 214                                         BACKGROUND_GREEN |
 215                                         BACKGROUND_BLUE;
 216                                 break;
 217                         case 48: /* Unknown */
 218                                 break;
 219                         case 49: /* reset */
 220                                 attr &= ~BACKGROUND_ALL;
 221                                 attr |= (plain_attr & BACKGROUND_ALL);
 222                                 break;
 223                         default:
 224                                 /* Unsupported code */
 225                                 break;
 226                         }
 227                         str++;
 228                 } while (*(str-1) == ';');
 229
 230                 set_console_attr();
 231                 break;
 232         case 'K':
 233                 erase_in_line();
 234                 break;
 235         default:
 236                 /* Unsupported code */
 237                 break;
 238         }
 239
 240         return func + 1;
 241 }
 242
 243 static int ansi_emulate(const char *str, FILE *stream)
 244 {
 245         int rv = 0;
 246         const char *pos = str;
 247
 248         while (*pos) {
 249                 pos = strstr(str, "\033[");
 250                 if (pos) {
 251                         size_t len = pos - str;
 252
 253                         if (len) {
 254                                 size_t out_len = fwrite(str, 1, len, stream);
 255                                 rv += out_len;
 256                                 if (out_len < len)
 257                                         return rv;
 258                         }
 259
 260                         str = pos + 2;
 261                         rv += 2;
 262
 263                         fflush(stream);
 264
 265                         pos = set_attr(str);
 266                         rv += pos - str;
 267                         str = pos;
 268                 } else {
 269                         rv += strlen(str);
 270                         fputs(str, stream);
 271                         return rv;
 272                 }
 273         }
 274         return rv;
 275 }
 276
 277 int winansi_fputs(const char *str, FILE *stream)
 278 {
 279         int rv;
 280
 281         if (!isatty(fileno(stream)))
 282                 return fputs(str, stream);
 283
 284         init();
 285
 286         if (!console)
 287                 return fputs(str, stream);
 288
 289         rv = ansi_emulate(str, stream);
 290
 291         if (rv >= 0)
 292                 return 0;
 293         else
 294                 return EOF;
 295 }
 296
 297 static int winansi_vfprintf(FILE *stream, const char *format, va_list list)
 298 {
 299         int len, rv;
 300         char small_buf[256];
 301         char *buf = small_buf;
 302         va_list cp;
 303
 304         if (!isatty(fileno(stream)))
 305                 goto abort;
 306
 307         init();
 308
 309         if (!console)
 310                 goto abort;
 311
 312         va_copy(cp, list);
 313         len = vsnprintf(small_buf, sizeof(small_buf), format, cp);
 314         va_end(cp);
 315
 316         if (len > sizeof(small_buf) - 1) {
 317                 buf = malloc(len + 1);
 318                 if (!buf)
 319                         goto abort;
 320
 321                 len = vsnprintf(buf, len + 1, format, list);
 322         }
 323
 324         rv = ansi_emulate(buf, stream);
 325
 326         if (buf != small_buf)
 327                 free(buf);
 328         return rv;
 329
 330 abort:
 331         rv = vfprintf(stream, format, list);
 332         return rv;
 333 }
 334
 335 int winansi_fprintf(FILE *stream, const char *format, ...)
 336 {
 337         va_list list;
 338         int rv;
 339
 340         va_start(list, format);
 341         rv = winansi_vfprintf(stream, format, list);
 342         va_end(list);
 343
 344         return rv;
 345 }
 346
 347 int winansi_printf(const char *format, ...)
 348 {
 349         va_list list;
 350         int rv;
 351
 352         va_start(list, format);
 353         rv = winansi_vfprintf(stdout, format, list);
 354         va_end(list);
 355
 356         return rv;
 357 }