contrib/cube/buffer.c

   1 /* This module defines the parse buffer and routines for setting/reading it */
   2
   3 #include "postgres.h"
   4
   5 #include "utils/elog.h"
   6
   7 static char *PARSE_BUFFER;
   8 static char *PARSE_BUFFER_PTR;
   9 static unsigned int PARSE_BUFFER_SIZE;
  10 static unsigned int SCANNER_POS;
  11
  12 void            set_parse_buffer(char *s);
  13 void            reset_parse_buffer(void);
  14 int                     read_parse_buffer(void);
  15 char       *parse_buffer(void);
  16 char       *parse_buffer_ptr(void);
  17 unsigned int parse_buffer_curr_char(void);
  18 unsigned int parse_buffer_size(void);
  19 unsigned int parse_buffer_pos(void);
  20
  21 extern void cube_flush_scanner_buffer(void);    /* defined in cubescan.l */
  22
  23 void
  24 set_parse_buffer(char *s)
  25 {
  26         PARSE_BUFFER = s;
  27         PARSE_BUFFER_SIZE = strlen(s);
  28         if (PARSE_BUFFER_SIZE == 0)
  29                 elog(ERROR, "cube_in: can't parse an empty string");
  30         PARSE_BUFFER_PTR = PARSE_BUFFER;
  31         SCANNER_POS = 0;
  32 }
  33
  34 void
  35 reset_parse_buffer(void)
  36 {
  37         PARSE_BUFFER_PTR = PARSE_BUFFER;
  38         SCANNER_POS = 0;
  39         cube_flush_scanner_buffer();
  40 }
  41
  42 int
  43 read_parse_buffer(void)
  44 {
  45         int                     c;
  46
  47         /*
  48          * c = *PARSE_BUFFER_PTR++; SCANNER_POS++;
  49          */
  50         c = PARSE_BUFFER[SCANNER_POS];
  51         if (SCANNER_POS < PARSE_BUFFER_SIZE)
  52                 SCANNER_POS++;
  53         return c;
  54 }
  55
  56 char *
  57 parse_buffer(void)
  58 {
  59         return PARSE_BUFFER;
  60 }
  61
  62 unsigned int
  63 parse_buffer_curr_char(void)
  64 {
  65         return PARSE_BUFFER[SCANNER_POS];
  66 }
  67
  68 char *
  69 parse_buffer_ptr(void)
  70 {
  71         return PARSE_BUFFER_PTR;
  72 }
  73
  74 unsigned int
  75 parse_buffer_pos(void)
  76 {
  77         return SCANNER_POS;
  78 }
  79
  80 unsigned int
  81 parse_buffer_size(void)
  82 {
  83         return PARSE_BUFFER_SIZE;
  84 }