granicus.if.org Git - postgresql/blob - src/interfaces/ecpg/preproc/c_keywords.c

   1 /*-------------------------------------------------------------------------
   2  *
   3  * keywords.c
   4  *        lexical token lookup for reserved words in postgres embedded SQL
   5  *
   6  *-------------------------------------------------------------------------
   7  */
   8 #include "postgres_fe.h"
   9
  10 #include <ctype.h>
  11
  12 #include "extern.h"
  13 #include "preproc.h"
  14
  15 /*
  16  * List of (keyword-name, keyword-token-value) pairs.
  17  *
  18  * !!WARNING!!: This list must be sorted, because binary
  19  *               search is used to locate entries.
  20  */
  21 static ScanKeyword ScanKeywords[] = {
  22         /* name                                 value                   */
  23         {"VARCHAR", VARCHAR},
  24         {"auto", S_AUTO},
  25         {"bool", SQL_BOOL},
  26         {"char", CHAR_P},
  27         {"const", S_CONST},
  28         {"enum", SQL_ENUM},
  29         {"extern", S_EXTERN},
  30         {"float", FLOAT_P},
  31         {"hour", HOUR_P},
  32         {"int", INT_P},
  33         {"long", SQL_LONG},
  34         {"minute", MINUTE_P},
  35         {"month", MONTH_P},
  36         {"register", S_REGISTER},
  37         {"second", SECOND_P},
  38         {"short", SQL_SHORT},
  39         {"signed", SQL_SIGNED},
  40         {"static", S_STATIC},
  41         {"struct", SQL_STRUCT},
  42         {"to", TO},
  43         {"typedef", S_TYPEDEF},
  44         {"union", UNION},
  45         {"unsigned", SQL_UNSIGNED},
  46         {"varchar", VARCHAR},
  47         {"volatile", S_VOLATILE},
  48         {"year", YEAR_P},
  49 };
  50
  51 ScanKeyword *
  52 ScanCKeywordLookup(char *text)
  53 {
  54         ScanKeyword *low = &ScanKeywords[0];
  55         ScanKeyword *high = endof(ScanKeywords) - 1;
  56         ScanKeyword *middle;
  57         int                     difference;
  58
  59         while (low <= high)
  60         {
  61                 middle = low + (high - low) / 2;
  62                 difference = strcmp(middle->name, text);
  63                 if (difference == 0)
  64                         return middle;
  65                 else if (difference < 0)
  66                         low = middle + 1;
  67                 else
  68                         high = middle - 1;
  69         }
  70
  71         return NULL;
  72 }