IABSD.fr/xenocara/app/luit/parser.c

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• Author : matthieu
  Date : 2008-10-13 20:34:11
  Hash : 2712cbe1
  Message : luit 1.0.3

• app/luit/parser.c

• /*
  Copyright (c) 2001 by Juliusz Chroboczek
  
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
  
  The above copyright notice and this permission notice shall be included in
  all copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  THE SOFTWARE.
  */
  /* $XFree86$ */
  
  #include <stdlib.h>
  #include <stdio.h>
  #include <string.h>
  
  #include "parser.h"
  
  static char keyword[MAX_KEYWORD_LENGTH];
  
  static void
  skipEndOfLine(FILE *f, int c)
  {
      if(c == 0)
          c = getc(f);
      
      for(;;)
          if(c <= 0 || c == '\n')
              return;
          else
              c = getc(f);
  }
  
  static int
  drainWhitespace(FILE *f, int c)
  {
      if(c == 0)
          c = getc(f);
  
      while (c == '#' || c == ' ' || c == '\t') {
          if(c <= 0)
              return 0;
          if(c == '#') {
              skipEndOfLine(f, c);
              return '\n';
          }
          c = getc(f);
      }
  
      return c;
  }
  
  static int
  getString(FILE *f, int string_end, int *c_return)
  {
      int i = 0;
      int c;
  
      c = getc(f);
      while(c > 0) {
          if(c == string_end)
              break;
          if(c == '\\') {
              c = getc(f);
              if(c == '\n')
                  continue;
          }
          keyword[i++] = c;
          if(i >= MAX_KEYWORD_LENGTH)
              return TOK_ERROR;
          c = getc(f);
      }
  
      if(c <= 0)
          return TOK_ERROR;
      keyword[i] = '\0';
      *c_return = c;
      return TOK_KEYWORD;
  }
  
  static int
  getToken(FILE *f, int c, int parse_assignments, int *c_return)
  {
      int i;
      c = drainWhitespace(f, c);
  
      if(c < 0)
          return TOK_EOF;
      if(c == '\n') {
          *c_return = 0;
          return TOK_EOL;
      }
  
      if(parse_assignments && c == '=') {
          *c_return = 0;
          return TOK_EQUALS;
      }
  
      if(c == '\'' || c == '"')
          return getString(f, c, c_return);
  
      i = 0;
      while(c > 0 && c != ' ' && c != '\t' && c != '\n') {
          if(c == '\\') {
              c = getc(f);
              if(c == '\n')
                  continue;
          }
          keyword[i++] = c;
          if(i >= MAX_KEYWORD_LENGTH)
              return TOK_ERROR;
          c = getc(f);
          if(parse_assignments && c == '=')
              break;
      }
  
      *c_return = c<0?0:c;
      keyword[i] = '\0';
      return TOK_KEYWORD;
  }
  
  
  /* Can parse both the old and new formats for locale.alias */
  static int
  parseTwoTokenLine(FILE *f, char *first, char *second)
  {
      int c = 0;
      int tok;
  
    again:
      
      tok = getToken(f, c, 0, &c);
      if(tok == TOK_EOF)
          return -1;
      else if(tok == TOK_EOL)
          goto again;
      else if(tok == TOK_KEYWORD) {
          int len = strlen(keyword);
          if(keyword[len - 1] == ':')
              keyword[len - 1] = '\0';
          strcpy(first, keyword);
      } else
          return -2;
  
      tok = getToken(f, c, 0, &c);
      if(tok == TOK_KEYWORD) {
          strcpy(second, keyword);
      } else
          return -2;
  
      tok = getToken(f, c, 0, &c);
      if(tok != TOK_EOL)
          return -2;
  
      return 0;
  }
  
  char *
  resolveLocale(const char *locale)
  {
      FILE *f;
      char first[MAX_KEYWORD_LENGTH], second[MAX_KEYWORD_LENGTH];
      char *resolved = NULL;
      int rc;
  
      f = fopen(LOCALE_ALIAS_FILE, "r");
      if(f == NULL)
          goto bail;
  
      do {
          rc = parseTwoTokenLine(f, first, second);
          if(rc < -1)
              goto bail;
          if(!strcmp(first, locale)) {
              resolved = strdup(second);
              if(resolved == NULL)
                  goto bail;
              break;
          }
      } while(rc >= 0);
  
      if(resolved == NULL) {
          resolved = strdup(locale);
          if(resolved == NULL)
              goto bail;
      }
  
      fclose(f);
  
      return resolved;
  
    bail:
      if(f != NULL)
          fclose(f);
      if(resolved != NULL)
          free(resolved);
      return NULL;
  }