libiberty/_doprnt.c

   1 /* Provide a version of _doprnt in terms of fprintf.
   2    Copyright (C) 1998-2023 Free Software Foundation, Inc.
   3    Contributed by Kaveh Ghazi  (ghazi@caip.rutgers.edu)  3/29/98
   4
   5 This program is free software; you can redistribute it and/or modify it
   6 under the terms of the GNU General Public License as published by the
   7 Free Software Foundation; either version 2, or (at your option) any
   8 later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
  18
  19 #include "config.h"
  20 #include "ansidecl.h"
  21 #include "safe-ctype.h"
  22
  23 #include <stdio.h>
  24 #include <stdarg.h>
  25 #ifdef HAVE_STRING_H
  26 #include <string.h>
  27 #endif
  28 #ifdef HAVE_STDLIB_H
  29 #include <stdlib.h>
  30 #endif
  31
  32 #undef _doprnt
  33
  34 #ifdef HAVE__DOPRNT
  35 #define TEST
  36 #endif
  37
  38 #ifdef TEST /* Make sure to use the internal one.  */
  39 #define _doprnt my_doprnt
  40 #endif
  41
  42 #define COPY_VA_INT \
  43   do { \
  44          const int value = abs (va_arg (ap, int)); \
  45          char buf[32]; \
  46          ptr++; /* Go past the asterisk.  */ \
  47          *sptr = '\0'; /* NULL terminate sptr.  */ \
  48          sprintf(buf, "%d", value); \
  49          strcat(sptr, buf); \
  50          while (*sptr) sptr++; \
  51      } while (0)
  52
  53 #define PRINT_CHAR(CHAR) \
  54   do { \
  55          putc(CHAR, stream); \
  56          ptr++; \
  57          total_printed++; \
  58      } while (0)
  59
  60 #define PRINT_TYPE(TYPE) \
  61   do { \
  62         int result; \
  63         TYPE value = va_arg (ap, TYPE); \
  64         *sptr++ = *ptr++; /* Copy the type specifier.  */ \
  65         *sptr = '\0'; /* NULL terminate sptr.  */ \
  66         result = fprintf(stream, specifier, value); \
  67         if (result == -1) \
  68           return -1; \
  69         else \
  70           { \
  71             total_printed += result; \
  72             continue; \
  73           } \
  74       } while (0)
  75
  76 int
  77 _doprnt (const char *format, va_list ap, FILE *stream)
  78 {
  79   const char * ptr = format;
  80   char specifier[128];
  81   int total_printed = 0;
  82
  83   while (*ptr != '\0')
  84     {
  85       if (*ptr != '%') /* While we have regular characters, print them.  */
  86         PRINT_CHAR(*ptr);
  87       else /* We got a format specifier! */
  88         {
  89           char * sptr = specifier;
  90           int wide_width = 0, short_width = 0;
  91
  92           *sptr++ = *ptr++; /* Copy the % and move forward.  */
  93
  94           while (strchr ("-+ #0", *ptr)) /* Move past flags.  */
  95             *sptr++ = *ptr++;
  96
  97           if (*ptr == '*')
  98             COPY_VA_INT;
  99           else
 100             while (ISDIGIT(*ptr)) /* Handle explicit numeric value.  */
 101               *sptr++ = *ptr++;
 102
 103           if (*ptr == '.')
 104             {
 105               *sptr++ = *ptr++; /* Copy and go past the period.  */
 106               if (*ptr == '*')
 107                 COPY_VA_INT;
 108               else
 109                 while (ISDIGIT(*ptr)) /* Handle explicit numeric value.  */
 110                   *sptr++ = *ptr++;
 111             }
 112           while (strchr ("hlL", *ptr))
 113             {
 114               switch (*ptr)
 115                 {
 116                 case 'h':
 117                   short_width = 1;
 118                   break;
 119                 case 'l':
 120                   wide_width++;
 121                   break;
 122                 case 'L':
 123                   wide_width = 2;
 124                   break;
 125                 default:
 126                   abort();
 127                 }
 128               *sptr++ = *ptr++;
 129             }
 130
 131           switch (*ptr)
 132             {
 133             case 'd':
 134             case 'i':
 135             case 'o':
 136             case 'u':
 137             case 'x':
 138             case 'X':
 139             case 'c':
 140               {
 141                 /* Short values are promoted to int, so just copy it
 142                    as an int and trust the C library printf to cast it
 143                    to the right width.  */
 144                 if (short_width)
 145                   PRINT_TYPE(int);
 146                 else
 147                   {
 148                     switch (wide_width)
 149                       {
 150                       case 0:
 151                         PRINT_TYPE(int);
 152                         break;
 153                       case 1:
 154                         PRINT_TYPE(long);
 155                         break;
 156                       case 2:
 157                       default:
 158 #if defined(__GNUC__) || defined(HAVE_LONG_LONG)
 159                         PRINT_TYPE(long long);
 160 #else
 161                         PRINT_TYPE(long); /* Fake it and hope for the best.  */
 162 #endif
 163                         break;
 164                       } /* End of switch (wide_width) */
 165                   } /* End of else statement */
 166               } /* End of integer case */
 167               break;
 168             case 'f':
 169             case 'e':
 170             case 'E':
 171             case 'g':
 172             case 'G':
 173               {
 174                 if (wide_width == 0)
 175                   PRINT_TYPE(double);
 176                 else
 177                   {
 178 #if defined(__GNUC__) || defined(HAVE_LONG_DOUBLE)
 179                     PRINT_TYPE(long double);
 180 #else
 181                     PRINT_TYPE(double); /* Fake it and hope for the best.  */
 182 #endif
 183                   }
 184               }
 185               break;
 186             case 's':
 187               PRINT_TYPE(char *);
 188               break;
 189             case 'p':
 190               PRINT_TYPE(void *);
 191               break;
 192             case '%':
 193               PRINT_CHAR('%');
 194               break;
 195             default:
 196               abort();
 197             } /* End of switch (*ptr) */
 198         } /* End of else statement */
 199     }
 200
 201   return total_printed;
 202 }
 203
 204 #ifdef TEST
 205
 206 #include <math.h>
 207 #ifndef M_PI
 208 #define M_PI (3.1415926535897932385)
 209 #endif
 210
 211 #define RESULT(x) do \
 212 { \
 213     int i = (x); \
 214     printf ("printed %d characters\n", i); \
 215     fflush(stdin); \
 216 } while (0)
 217
 218 static int checkit (const char * format, ...) ATTRIBUTE_PRINTF_1;
 219
 220 static int
 221 checkit (const char* format, ...)
 222 {
 223   int result;
 224   va_list args;
 225   va_start (args, format);
 226
 227   result = _doprnt (format, args, stdout);
 228   va_end (args);
 229
 230   return result;
 231 }
 232
 233 int
 234 main (void)
 235 {
 236   RESULT(checkit ("<%d>\n", 0x12345678));
 237   RESULT(printf ("<%d>\n", 0x12345678));
 238
 239   RESULT(checkit ("<%200d>\n", 5));
 240   RESULT(printf ("<%200d>\n", 5));
 241
 242   RESULT(checkit ("<%.300d>\n", 6));
 243   RESULT(printf ("<%.300d>\n", 6));
 244
 245   RESULT(checkit ("<%100.150d>\n", 7));
 246   RESULT(printf ("<%100.150d>\n", 7));
 247
 248   RESULT(checkit ("<%s>\n",
 249                   "jjjjjjjjjiiiiiiiiiiiiiiioooooooooooooooooppppppppppppaa\n\
 250 777777777777777777333333333333366666666666622222222222777777777777733333"));
 251   RESULT(printf ("<%s>\n",
 252                  "jjjjjjjjjiiiiiiiiiiiiiiioooooooooooooooooppppppppppppaa\n\
 253 777777777777777777333333333333366666666666622222222222777777777777733333"));
 254
 255   RESULT(checkit ("<%f><%0+#f>%s%d%s>\n",
 256                   1.0, 1.0, "foo", 77, "asdjffffffffffffffiiiiiiiiiiixxxxx"));
 257   RESULT(printf ("<%f><%0+#f>%s%d%s>\n",
 258                  1.0, 1.0, "foo", 77, "asdjffffffffffffffiiiiiiiiiiixxxxx"));
 259
 260   RESULT(checkit ("<%4f><%.4f><%%><%4.4f>\n", M_PI, M_PI, M_PI));
 261   RESULT(printf ("<%4f><%.4f><%%><%4.4f>\n", M_PI, M_PI, M_PI));
 262
 263   RESULT(checkit ("<%*f><%.*f><%%><%*.*f>\n", 3, M_PI, 3, M_PI, 3, 3, M_PI));
 264   RESULT(printf ("<%*f><%.*f><%%><%*.*f>\n", 3, M_PI, 3, M_PI, 3, 3, M_PI));
 265
 266   RESULT(checkit ("<%d><%i><%o><%u><%x><%X><%c>\n",
 267                   75, 75, 75, 75, 75, 75, 75));
 268   RESULT(printf ("<%d><%i><%o><%u><%x><%X><%c>\n",
 269                  75, 75, 75, 75, 75, 75, 75));
 270
 271   RESULT(checkit ("<%d><%i><%o><%u><%x><%X><%c>\n",
 272                   75, 75, 75, 75, 75, 75, 75));
 273   RESULT(printf ("<%d><%i><%o><%u><%x><%X><%c>\n",
 274                  75, 75, 75, 75, 75, 75, 75));
 275
 276   RESULT(checkit ("Testing (hd) short: <%d><%ld><%hd><%hd><%d>\n", 123, (long)234, 345, 123456789, 456));
 277   RESULT(printf ("Testing (hd) short: <%d><%ld><%hd><%hd><%d>\n", 123, (long)234, 345, 123456789, 456));
 278
 279 #if defined(__GNUC__) || defined (HAVE_LONG_LONG)
 280   RESULT(checkit ("Testing (lld) long long: <%d><%lld><%d>\n", 123, 234234234234234234LL, 345));
 281   RESULT(printf ("Testing (lld) long long: <%d><%lld><%d>\n", 123, 234234234234234234LL, 345));
 282   RESULT(checkit ("Testing (Ld) long long: <%d><%Ld><%d>\n", 123, 234234234234234234LL, 345));
 283   RESULT(printf ("Testing (Ld) long long: <%d><%Ld><%d>\n", 123, 234234234234234234LL, 345));
 284 #endif
 285
 286 #if defined(__GNUC__) || defined (HAVE_LONG_DOUBLE)
 287   RESULT(checkit ("Testing (Lf) long double: <%.20f><%.20Lf><%0+#.20f>\n",
 288                   1.23456, 1.234567890123456789L, 1.23456));
 289   RESULT(printf ("Testing (Lf) long double: <%.20f><%.20Lf><%0+#.20f>\n",
 290                  1.23456, 1.234567890123456789L, 1.23456));
 291 #endif
 292
 293   return 0;
 294 }
 295 #endif /* TEST */