usr/src/lib/libc/port/fp/file_decim.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #include "lint.h"
  30 #include "file64.h"
  31 #include "mtlib.h"
  32 #include <sys/types.h>
  33 #include <ctype.h>
  34 #include <stdio.h>
  35 #include "base_conversion.h"
  36 #include <locale.h>
  37 #include <thread.h>
  38 #include <synch.h>
  39 #include "stdiom.h"
  40 #include "libc.h"
  41
  42 /* if the _IOWRT flag is set, this must be a call from sscanf */
  43 #define mygetc(iop)     ((iop->_flag & _IOWRT) ? \
  44                                 ((*iop->_ptr == '\0') ? EOF : *iop->_ptr++) : \
  45                                 GETC(iop))
  46
  47 #define myungetc(x, iop)        ((iop->_flag & _IOWRT) ? *(--iop->_ptr) : \
  48                                         UNGETC(x, iop))
  49
  50
  51 void
  52 file_to_decimal(char **ppc, int nmax, int fortran_conventions,
  53                 decimal_record *pd, enum decimal_string_form *pform,
  54                 char **pechar, FILE *pf, int *pnread)
  55 {
  56         char    *cp = *ppc - 1; /* last character seen */
  57         char    *good = cp;     /* last character accepted */
  58         int     current;        /* *cp or EOF */
  59         int     nread = 0;      /* number of characters read so far */
  60
  61 /* if the _IOWRT flag is set, this must be a call from sscanf */
  62 #define NEXT \
  63         if (nread < nmax) { \
  64                 current = ((pf->_flag & _IOWRT) ? \
  65                     ((*pf->_ptr == '\0') ? EOF : *pf->_ptr++) : \
  66                     GETC(pf)); \
  67                 if (current != EOF) { \
  68                         *++cp = (char)current; \
  69                         nread++; \
  70                 } \
  71         } else { \
  72                 current = EOF; \
  73         }
  74
  75         NEXT;
  76
  77 #include "char_to_decimal.h"
  78
  79         /*
  80          * If we read any characters beyond the end of the accepted
  81          * token, try to push them back.
  82          */
  83         if (fortran_conventions < 0) {
  84                 /* in C99 mode, push back at most one character */
  85                 if (cp >= *ppc && current != EOF && myungetc(current, pf)
  86                     != EOF) {
  87                         cp--;
  88                         nread--;
  89                 }
  90         } else {
  91                 while (cp >= *ppc) {
  92                         if (myungetc((int)(unsigned char)*cp, pf) == EOF)
  93                                 break;
  94                         cp--;
  95                         nread--;
  96                 }
  97         }
  98
  99         *++cp = '\0';
 100         *pnread = nread;
 101 }