libguile/chars.c

   1 /*      Copyright (C) 1995,1996,1998 Free Software Foundation, Inc.
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2, or (at your option)
   6  * any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this software; see the file COPYING.  If not, write to
  15  * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  16  * Boston, MA 02111-1307 USA
  17  *
  18  * As a special exception, the Free Software Foundation gives permission
  19  * for additional uses of the text contained in its release of GUILE.
  20  *
  21  * The exception is that, if you link the GUILE library with other files
  22  * to produce an executable, this does not by itself cause the
  23  * resulting executable to be covered by the GNU General Public License.
  24  * Your use of that executable is in no way restricted on account of
  25  * linking the GUILE library code into it.
  26  *
  27  * This exception does not however invalidate any other reasons why
  28  * the executable file might be covered by the GNU General Public License.
  29  *
  30  * This exception applies only to the code released by the
  31  * Free Software Foundation under the name GUILE.  If you copy
  32  * code from other Free Software Foundation releases into a copy of
  33  * GUILE, as the General Public License permits, the exception does
  34  * not apply to the code that you add in this way.  To avoid misleading
  35  * anyone as to the status of such modified files, you must delete
  36  * this exception notice from them.
  37  *
  38  * If you write modifications of your own for GUILE, it is your choice
  39  * whether to permit this exception to apply to your modifications.
  40  * If you do not wish that, delete this exception notice.  */
  41
  42 /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
  43    gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
  44
  45 \f
  46
  47 #include <stdio.h>
  48 #include <ctype.h>
  49 #include "_scm.h"
  50 #include "scm_validate.h"
  51
  52 #include "chars.h"
  53 \f
  54
  55 SCM_DEFINE (scm_char_p, "char?", 1, 0, 0,
  56             (SCM x),
  57 "Return #t iff X is a character, else #f.")
  58 #define FUNC_NAME s_scm_char_p
  59 {
  60   return SCM_BOOL(SCM_ICHRP(x));
  61 }
  62 #undef FUNC_NAME
  63
  64 GUILE_PROC1 (scm_char_eq_p, "char=?", scm_tc7_rpsubr,
  65              (SCM x, SCM y),
  66 "Return #t iff X is the same character as Y, else #f.")
  67 #define FUNC_NAME s_scm_char_eq_p
  68 {
  69   SCM_VALIDATE_CHAR(1,x);
  70   SCM_VALIDATE_CHAR(2,y);
  71   return SCM_BOOL(SCM_ICHR(x) == SCM_ICHR(y));
  72 }
  73 #undef FUNC_NAME
  74
  75
  76 GUILE_PROC1 (scm_char_less_p, "char<?", scm_tc7_rpsubr,
  77              (SCM x, SCM y),
  78 "Return #t iff X is less than Y in the Ascii sequence, else #f.")
  79 #define FUNC_NAME s_scm_char_less_p
  80 {
  81   SCM_VALIDATE_CHAR(1,x);
  82   SCM_VALIDATE_CHAR(2,y);
  83   return SCM_BOOL(SCM_ICHR(x) < SCM_ICHR(y));
  84 }
  85 #undef FUNC_NAME
  86
  87 GUILE_PROC1 (scm_char_leq_p, "char<=?", scm_tc7_rpsubr,
  88              (SCM x, SCM y),
  89 "Return #t iff X is less than or equal to Y in the Ascii sequence, else #f.")
  90 #define FUNC_NAME s_scm_char_leq_p
  91 {
  92   SCM_VALIDATE_CHAR(1,x);
  93   SCM_VALIDATE_CHAR(2,y);
  94   return SCM_BOOL(SCM_ICHR(x) <= SCM_ICHR(y));
  95 }
  96 #undef FUNC_NAME
  97
  98 GUILE_PROC1 (scm_char_gr_p, "char>?", scm_tc7_rpsubr,
  99              (SCM x, SCM y),
 100 "Return #t iff X is greater than Y in the Ascii sequence, else #f.")
 101 #define FUNC_NAME s_scm_char_gr_p
 102 {
 103   SCM_VALIDATE_CHAR(1,x);
 104   SCM_VALIDATE_CHAR(2,y);
 105   return SCM_BOOL(SCM_ICHR(x) > SCM_ICHR(y));
 106 }
 107 #undef FUNC_NAME
 108
 109 GUILE_PROC1 (scm_char_geq_p, "char>=?", scm_tc7_rpsubr,
 110              (SCM x, SCM y),
 111 "Return #t iff X is greater than or equal to Y in the Ascii sequence, else #f.")
 112 #define FUNC_NAME s_scm_char_geq_p
 113 {
 114   SCM_VALIDATE_CHAR(1,x);
 115   SCM_VALIDATE_CHAR(2,y);
 116   return SCM_BOOL(SCM_ICHR(x) >= SCM_ICHR(y));
 117 }
 118 #undef FUNC_NAME
 119
 120 GUILE_PROC1 (scm_char_ci_eq_p, "char-ci=?", scm_tc7_rpsubr,
 121              (SCM x, SCM y),
 122 "Return #t iff X is the same character as Y ignoring case, else #f.")
 123 #define FUNC_NAME s_scm_char_ci_eq_p
 124 {
 125   SCM_VALIDATE_CHAR(1,x);
 126   SCM_VALIDATE_CHAR(2,y);
 127   return SCM_BOOL(scm_upcase(SCM_ICHR(x))==scm_upcase(SCM_ICHR(y)));
 128 }
 129 #undef FUNC_NAME
 130
 131 GUILE_PROC1 (scm_char_ci_less_p, "char-ci<?", scm_tc7_rpsubr,
 132              (SCM x, SCM y),
 133 "Return #t iff X is less than Y in the Ascii sequence ignoring case, else #f.")
 134 #define FUNC_NAME s_scm_char_ci_less_p
 135 {
 136   SCM_VALIDATE_CHAR(1,x);
 137   SCM_VALIDATE_CHAR(2,y);
 138   return SCM_BOOL((scm_upcase(SCM_ICHR(x))) < scm_upcase(SCM_ICHR(y)));
 139 }
 140 #undef FUNC_NAME
 141
 142 GUILE_PROC1 (scm_char_ci_leq_p, "char-ci<=?", scm_tc7_rpsubr,
 143              (SCM x, SCM y),
 144 "Return #t iff X is less than or equal to Y in the Ascii sequence ignoring case, else #f.")
 145 #define FUNC_NAME s_scm_char_ci_leq_p
 146 {
 147   SCM_VALIDATE_CHAR(1,x);
 148   SCM_VALIDATE_CHAR(2,y);
 149   return SCM_BOOL(scm_upcase(SCM_ICHR(x)) <= scm_upcase(SCM_ICHR(y)));
 150 }
 151 #undef FUNC_NAME
 152
 153 GUILE_PROC1 (scm_char_ci_gr_p, "char-ci>?", scm_tc7_rpsubr,
 154              (SCM x, SCM y),
 155 "Return #t iff X is greater than Y in the Ascii sequence ignoring case, else #f.")
 156 #define FUNC_NAME s_scm_char_ci_gr_p
 157 {
 158   SCM_VALIDATE_CHAR(1,x);
 159   SCM_VALIDATE_CHAR(2,y);
 160   return SCM_BOOL(scm_upcase(SCM_ICHR(x)) > scm_upcase(SCM_ICHR(y)));
 161 }
 162 #undef FUNC_NAME
 163
 164 GUILE_PROC1 (scm_char_ci_geq_p, "char-ci>=?", scm_tc7_rpsubr,
 165              (SCM x, SCM y),
 166 "Return #t iff X is greater than or equal to Y in the Ascii sequence ignoring case, else #f.")
 167 #define FUNC_NAME s_scm_char_ci_geq_p
 168 {
 169   SCM_VALIDATE_CHAR(1,x);
 170   SCM_VALIDATE_CHAR(2,y);
 171   return SCM_BOOL(scm_upcase(SCM_ICHR(x)) >= scm_upcase(SCM_ICHR(y)));
 172 }
 173 #undef FUNC_NAME
 174
 175
 176 SCM_DEFINE(scm_char_alphabetic_p, "char-alphabetic?", 1, 0, 0,
 177            (SCM chr),
 178 "Return #t iff CHR is alphabetic, else #f.
 179 Alphabetic means the same thing as the isalpha C library function.")
 180 #define FUNC_NAME s_scm_char_alphabetic_p
 181 {
 182   SCM_VALIDATE_CHAR(1,chr);
 183   return SCM_BOOL(isascii(SCM_ICHR(chr)) && isalpha(SCM_ICHR(chr)));
 184 }
 185 #undef FUNC_NAME
 186
 187 SCM_DEFINE(scm_char_numeric_p, "char-numeric?", 1, 0, 0,
 188            (SCM chr),
 189 "Return #t iff CHR is numeric, else #f.
 190 Numeric means the same thing as the isdigit C library function.")
 191 #define FUNC_NAME s_scm_char_numeric_p
 192 {
 193   SCM_VALIDATE_CHAR(1,chr);
 194   return SCM_BOOL(isascii(SCM_ICHR(chr)) && isdigit(SCM_ICHR(chr)));
 195 }
 196 #undef FUNC_NAME
 197
 198 SCM_DEFINE(scm_char_whitespace_p, "char-whitespace?", 1, 0, 0,
 199            (SCM chr),
 200 "Return #t iff CHR is whitespace, else #f.
 201 Whitespace means the same thing as the isspace C library function.")
 202 #define FUNC_NAME s_scm_char_whitespace_p
 203 {
 204   SCM_VALIDATE_CHAR(1,chr);
 205   return SCM_BOOL(isascii(SCM_ICHR(chr)) && isspace(SCM_ICHR(chr)));
 206 }
 207 #undef FUNC_NAME
 208
 209
 210
 211 SCM_DEFINE(scm_char_upper_case_p, "char-upper-case?", 1, 0, 0,
 212            (SCM chr),
 213 "Return #t iff CHR is uppercase, else #f.
 214 Uppercase means the same thing as the isupper C library function.")
 215 #define FUNC_NAME s_scm_char_upper_case_p
 216 {
 217   SCM_VALIDATE_CHAR(1,chr);
 218   return SCM_BOOL(isascii(SCM_ICHR(chr)) && isupper(SCM_ICHR(chr)));
 219 }
 220 #undef FUNC_NAME
 221
 222
 223 SCM_DEFINE(scm_char_lower_case_p, "char-lower-case?", 1, 0, 0,
 224            (SCM chr),
 225 "Return #t iff CHR is lowercase, else #f.
 226 Lowercase means the same thing as the islower C library function.")
 227 #define FUNC_NAME s_scm_char_lower_case_p
 228 {
 229   SCM_VALIDATE_CHAR(1,chr);
 230   return SCM_BOOL(isascii(SCM_ICHR(chr)) && islower(SCM_ICHR(chr)));
 231 }
 232 #undef FUNC_NAME
 233
 234
 235
 236 SCM_DEFINE (scm_char_is_both_p, "char-is-both?", 1, 0, 0,
 237             (SCM chr),
 238 "Return #t iff CHR is either uppercase or lowercase, else #f.
 239 Uppercase and lowercase are as defined by the isupper and islower
 240 C library functions.")
 241 #define FUNC_NAME s_scm_char_is_both_p
 242 {
 243   SCM_VALIDATE_CHAR(1,chr);
 244   return SCM_BOOL(isascii(SCM_ICHR(chr)) && (isupper(SCM_ICHR(chr)) || islower(SCM_ICHR(chr))));
 245 }
 246 #undef FUNC_NAME
 247
 248
 249
 250
 251 SCM_DEFINE (scm_char_to_integer, "char->integer", 1, 0, 0,
 252             (SCM chr),
 253 "Return the number corresponding to ordinal position of CHR in the Ascii sequence.")
 254 #define FUNC_NAME s_scm_char_to_integer
 255 {
 256   SCM_VALIDATE_CHAR(1,chr);
 257   return scm_ulong2num((unsigned long)SCM_ICHR(chr));
 258 }
 259 #undef FUNC_NAME
 260
 261
 262
 263 SCM_DEFINE(scm_integer_to_char, "integer->char", 1, 0, 0,
 264            (SCM n),
 265 "Return the character at position N in the Ascii sequence.")
 266 #define FUNC_NAME s_scm_integer_to_char
 267 {
 268   unsigned long ni = 0xffff & SCM_NUM2ULONG (1,n);
 269   return SCM_MAKICHR(ni);
 270 }
 271 #undef FUNC_NAME
 272
 273
 274 SCM_DEFINE(scm_char_upcase, "char-upcase", 1, 0, 0,
 275            (SCM chr),
 276 "Return the uppercase character version of CHR.")
 277 #define FUNC_NAME s_scm_char_upcase
 278 {
 279   SCM_VALIDATE_CHAR(1,chr);
 280   return SCM_MAKICHR(scm_upcase(SCM_ICHR(chr)));
 281 }
 282 #undef FUNC_NAME
 283
 284
 285 SCM_DEFINE(scm_char_downcase, "char-downcase", 1, 0, 0,
 286            (SCM chr),
 287 "Return the lowercase character version of CHR.")
 288 #define FUNC_NAME s_scm_char_downcase
 289 {
 290   SCM_VALIDATE_CHAR(1,chr);
 291   return SCM_MAKICHR(scm_downcase(SCM_ICHR(chr)));
 292 }
 293 #undef FUNC_NAME
 294
 295 \f
 296
 297
 298
 299 static unsigned char scm_upcase_table[SCM_CHAR_CODE_LIMIT];
 300 static unsigned char scm_downcase_table[SCM_CHAR_CODE_LIMIT];
 301 static const unsigned char scm_lowers[] = "abcdefghijklmnopqrstuvwxyz";
 302 static const unsigned char scm_uppers[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
 303
 304
 305 void
 306 scm_tables_prehistory ()
 307 {
 308   int i;
 309   for (i = 0; i < SCM_CHAR_CODE_LIMIT; i++)
 310     scm_upcase_table[i] = scm_downcase_table[i] = i;
 311   for (i = 0; i < (int) (sizeof scm_lowers / sizeof (scm_lowers[0])); i++)
 312     {
 313       scm_upcase_table[scm_lowers[i]] = scm_uppers[i];
 314       scm_downcase_table[scm_uppers[i]] = scm_lowers[i];
 315     }
 316 }
 317
 318
 319 int
 320 scm_upcase (unsigned int c)
 321 {
 322   if (c < sizeof (scm_upcase_table))
 323     return scm_upcase_table[c];
 324   else
 325     return c;
 326 }
 327
 328
 329 int
 330 scm_downcase (unsigned int c)
 331 {
 332   if (c < sizeof (scm_downcase_table))
 333     return scm_downcase_table[c];
 334   else
 335     return c;
 336 }
 337
 338
 339 #ifdef _DCC
 340 # define ASCII
 341 #else
 342 # if (('\n'=='\025') && (' '=='\100') && ('a'=='\201') && ('A'=='\301'))
 343 #  define EBCDIC
 344 # endif /*  (('\n'=='\025') && (' '=='\100') && ('a'=='\201') && ('A'=='\301')) */
 345 # if (('\n'=='\012') && (' '=='\040') && ('a'=='\141') && ('A'=='\101'))
 346 #  define ASCII
 347 # endif /*  (('\n'=='\012') && (' '=='\040') && ('a'=='\141') && ('A'=='\101')) */
 348 #endif /* def _DCC */
 349
 350
 351 #ifdef EBCDIC
 352 char *const scm_charnames[] =
 353 {
 354   "nul","soh","stx","etx", "pf", "ht", "lc","del",
 355    0   , 0   ,"smm", "vt", "ff", "cr", "so", "si",
 356   "dle","dc1","dc2","dc3","res", "nl", "bs", "il",
 357   "can", "em", "cc", 0   ,"ifs","igs","irs","ius",
 358    "ds","sos", "fs", 0   ,"byp", "lf","eob","pre",
 359    0   , 0   , "sm", 0   , 0   ,"enq","ack","bel",
 360    0   , 0   ,"syn", 0   , "pn", "rs", "uc","eot",
 361    0   , 0   , 0   , 0   ,"dc4","nak", 0   ,"sub",
 362    "space", scm_s_newline, "tab", "backspace", "return", "page", "null"};
 363
 364 const char scm_charnums[] =
 365 "\000\001\002\003\004\005\006\007\
 366 \010\011\012\013\014\015\016\017\
 367 \020\021\022\023\024\025\026\027\
 368 \030\031\032\033\034\035\036\037\
 369 \040\041\042\043\044\045\046\047\
 370 \050\051\052\053\054\055\056\057\
 371 \060\061\062\063\064\065\066\067\
 372 \070\071\072\073\074\075\076\077\
 373  \n\t\b\r\f\0";
 374 #endif /* def EBCDIC */
 375 #ifdef ASCII
 376 char *const scm_charnames[] =
 377 {
 378   "nul","soh","stx","etx","eot","enq","ack","bel",
 379    "bs", "ht", "newline", "vt", "np", "cr", "so", "si",
 380   "dle","dc1","dc2","dc3","dc4","nak","syn","etb",
 381   "can", "em","sub","esc", "fs", "gs", "rs", "us",
 382   "space", "nl", "tab", "backspace", "return", "page", "null", "del"};
 383 const char scm_charnums[] =
 384 "\000\001\002\003\004\005\006\007\
 385 \010\011\012\013\014\015\016\017\
 386 \020\021\022\023\024\025\026\027\
 387 \030\031\032\033\034\035\036\037\
 388  \n\t\b\r\f\0\177";
 389 #endif /* def ASCII */
 390
 391 int scm_n_charnames = sizeof (scm_charnames) / sizeof (char *);
 392
 393
 394 \f
 395
 396
 397 void
 398 scm_init_chars ()
 399 {
 400 #include "chars.x"
 401 }
 402