source/extra/ustdio/uprntf_p.c

/*
*******************************************************************************
*
*   Copyright (C) 1998-1999, International Business Machines
*   Corporation and others.  All Rights Reserved.
*
*******************************************************************************
*
* File uprntf_p.c
*
* Modification History:
*
*   Date        Name        Description
*   11/23/98    stephen        Creation.
*   03/12/99    stephen     Modified for new C API.
*******************************************************************************
*/

#include "uprntf_p.h"
#include "ufmt_cmn.h"

/* flag characters for uprintf */
#define FLAG_MINUS 0x002D
#define FLAG_PLUS 0x002B
#define FLAG_SPACE 0x0020
#define FLAG_POUND 0x0023
#define FLAG_ZERO  0x0030
#define FLAG_PAREN 0x0028

#define ISFLAG(s)    (s) == FLAG_MINUS || \
            (s) == FLAG_PLUS || \
            (s) == FLAG_SPACE || \
            (s) == FLAG_POUND || \
            (s) == FLAG_ZERO || \
            (s) == FLAG_PAREN

/* special characters for uprintf */
#define SPEC_ASTERISK 0x002A
#define SPEC_DOLLARSIGN 0x0024
#define SPEC_PERIOD 0x002E
#define SPEC_PERCENT 0x0025

/* unicode digits */
#define DIGIT_ZERO 0x0030
#define DIGIT_ONE 0x0031
#define DIGIT_TWO 0x0032
#define DIGIT_THREE 0x0033
#define DIGIT_FOUR 0x0034
#define DIGIT_FIVE 0x0035
#define DIGIT_SIX 0x0036
#define DIGIT_SEVEN 0x0037
#define DIGIT_EIGHT 0x0038
#define DIGIT_NINE 0x0039

#define ISDIGIT(s)    (s) == DIGIT_ZERO || \
            (s) == DIGIT_ONE || \
            (s) == DIGIT_TWO || \
            (s) == DIGIT_THREE || \
            (s) == DIGIT_FOUR || \
            (s) == DIGIT_FIVE || \
            (s) == DIGIT_SIX || \
            (s) == DIGIT_SEVEN || \
            (s) == DIGIT_EIGHT || \
            (s) == DIGIT_NINE

/* u_printf modifiers */
#define MOD_H 0x0068
#define MOD_LOWERL 0x006C
#define MOD_L 0x004C

#define ISMOD(s)    (s) == MOD_H || \
            (s) == MOD_LOWERL || \
            (s) == MOD_L

/* We parse the argument list in Unicode */
int32_t
u_printf_parse_spec (const UChar     *fmt,
             u_printf_spec    *spec)
{
  const UChar *s = fmt;
  const UChar *backup;
  u_printf_spec_info *info = &(spec->fInfo);

  /* initialize spec to default values */  
  spec->fWidthPos     = -1;
  spec->fPrecisionPos = -1;
  spec->fArgPos       = -1;

  info->fPrecision    = -1;
  info->fWidth        = -1;
  info->fSpec         = 0x0000;
  info->fPadChar      = 0x0020;
  info->fAlt          = FALSE;
  info->fSpace        = FALSE;
  info->fLeft         = FALSE;
  info->fShowSign     = FALSE;
  info->fZero         = FALSE;
  info->fIsLongDouble = FALSE;
  info->fIsShort      = FALSE;
  info->fIsLong       = FALSE;
  info->fIsLongLong   = FALSE;

  /* skip over the initial '%' */
  s++;

  /* Check for positional argument */
  if(ISDIGIT(*s)) {

    /* Save the current position */
    backup = s;
    
    /* handle positional parameters */
    if(ISDIGIT(*s)) {
      spec->fArgPos = (int) (*s++ - DIGIT_ZERO);
      
      while(ISDIGIT(*s)) {
        spec->fArgPos *= 10;
        spec->fArgPos += (int) (*s++ - DIGIT_ZERO);
      }
    }
    
    /* if there is no '$', don't read anything */
    if(*s != SPEC_DOLLARSIGN) {
      spec->fArgPos = -1;
      s = backup;
    }
    /* munge the '$' */
    else
      s++;
  }
  
  /* Get any format flags */
  while(ISFLAG(*s)) {
    switch(*s++) {
      
      /* left justify */
    case FLAG_MINUS:
      info->fLeft = TRUE;
      break;
      
      /* always show sign */
    case FLAG_PLUS:
      info->fShowSign = TRUE;
      break;

      /* use space if no sign present */
    case FLAG_SPACE:
      info->fSpace = TRUE;
      break;

      /* use alternate form */
    case FLAG_POUND:
      info->fAlt = TRUE;
      break;

      /* pad with leading zeroes */
    case FLAG_ZERO:
      info->fZero = TRUE;
      info->fPadChar = 0x0030;
      break;

      /* pad character specified */
    case FLAG_PAREN:

      /* first four characters are hex values for pad char */
      info->fPadChar = (UChar)ufmt_digitvalue(*s++);
      info->fPadChar = (UChar)((info->fPadChar * 16) + ufmt_digitvalue(*s++));
      info->fPadChar = (UChar)((info->fPadChar * 16) + ufmt_digitvalue(*s++));
      info->fPadChar = (UChar)((info->fPadChar * 16) + ufmt_digitvalue(*s++));
      
      /* final character is ignored */
      s++;
      
      break;
    }
  }

  /* Get the width */

  /* width is specified out of line */
  if(*s == SPEC_ASTERISK) {

    info->fWidth = -2;

    /* Skip the '*' */
    s++;

    /* Save the current position */
    backup = s;
    
    /* handle positional parameters */
    if(ISDIGIT(*s)) {
      spec->fWidthPos = (int) (*s++ - DIGIT_ZERO);
      
      while(ISDIGIT(*s)) {
        spec->fWidthPos *= 10;
        spec->fWidthPos += (int) (*s++ - DIGIT_ZERO);
      }
    }

    /* if there is no '$', don't read anything */
    if(*s != SPEC_DOLLARSIGN) {
      spec->fWidthPos = -1;
      s = backup;
    }
    /* munge the '$' */
    else
      s++;
  }
  /* read the width, if present */
  else if(ISDIGIT(*s)){
    info->fWidth = (int) (*s++ - DIGIT_ZERO);
    
    while(ISDIGIT(*s)) {
      info->fWidth *= 10;
      info->fWidth += (int) (*s++ - DIGIT_ZERO);
    }
  }
  
  /* Get the precision */
  
  if(*s == SPEC_PERIOD) {
    
    /* eat up the '.' */
    s++;
    
    /* precision is specified out of line */
    if(*s == SPEC_ASTERISK) {

      info->fPrecision = -2;

      /* Skip the '*' */
      s++;

      /* save the current position */
      backup = s;
      
      /* handle positional parameters */
      if(ISDIGIT(*s)) {
        spec->fPrecisionPos = (int) (*s++ - DIGIT_ZERO);

        while(ISDIGIT(*s)) {
          spec->fPrecisionPos *= 10;
          spec->fPrecisionPos += (int) (*s++ - DIGIT_ZERO);
        }
    
        /* if there is no '$', don't read anything */
        if(*s != SPEC_DOLLARSIGN) {
          spec->fPrecisionPos = -1;
          s = backup;
        }
        else {
          /* munge the '$' */
          s++; 
        }
      }
    }
    /* read the precision */
    else if(ISDIGIT(*s)){
      info->fPrecision = (int) (*s++ - DIGIT_ZERO);
      
      while(ISDIGIT(*s)) {
        info->fPrecision *= 10;
        info->fPrecision += (int) (*s++ - DIGIT_ZERO);
      }
    }
  }

  /* Get any modifiers */
  if(ISMOD(*s)) {
    switch(*s++) {

      /* short */
    case MOD_H:
      info->fIsShort = TRUE;
      break;

      /* long or long long */
    case MOD_LOWERL:
      if(*s == MOD_LOWERL) {
        info->fIsLongLong = TRUE;
        /* skip over the next 'l' */
        s++;
      }
      else
        info->fIsLong = TRUE;
      break;
      
      /* long double */
    case MOD_L:
      info->fIsLongDouble = TRUE;
      break;
    }
  }

  /* finally, get the specifier letter */
  info->fSpec = *s++;

  /* return # of characters in this specifier */
  return (s - fmt);
}