xref: /illumos-gate/usr/src/lib/libc/port/fp/file_decim.c (revision e7cbe64f7a72dae5cb44f100db60ca88f3313c65)
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, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 /*
23  * Copyright 2004 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 #pragma weak file_to_decimal = _file_to_decimal
30 
31 #include "synonyms.h"
32 #include "file64.h"
33 #include "mtlib.h"
34 #include <sys/types.h>
35 #include <ctype.h>
36 #include <stdio.h>
37 #include "base_conversion.h"
38 #include <locale.h>
39 #include <thread.h>
40 #include <synch.h>
41 #include "stdiom.h"
42 #include "libc.h"
43 
44 /* if the _IOWRT flag is set, this must be a call from sscanf */
45 #define	mygetc(iop)	((iop->_flag & _IOWRT) ? \
46 				((*iop->_ptr == '\0') ? EOF : *iop->_ptr++) : \
47 				GETC(iop))
48 
49 #define	myungetc(x, iop)	((iop->_flag & _IOWRT) ? *(--iop->_ptr) : \
50 					UNGETC(x, iop))
51 
52 
53 void
54 file_to_decimal(char **ppc, int nmax, int fortran_conventions,
55 		decimal_record *pd, enum decimal_string_form *pform,
56 		char **pechar, FILE *pf, int *pnread)
57 {
58 	char	*cp = *ppc - 1;	/* last character seen */
59 	char	*good = cp;	/* last character accepted */
60 	int	current;	/* *cp or EOF */
61 	int	nread = 0;	/* number of characters read so far */
62 
63 /* if the _IOWRT flag is set, this must be a call from sscanf */
64 #define	NEXT \
65 	if (nread < nmax) { \
66 		current = ((pf->_flag & _IOWRT) ? \
67 		    ((*pf->_ptr == '\0') ? EOF : *pf->_ptr++) : \
68 		    GETC(pf)); \
69 		if (current != EOF) { \
70 			*++cp = (char)current; \
71 			nread++; \
72 		} \
73 	} else { \
74 		current = EOF; \
75 	}
76 
77 	NEXT;
78 
79 #include "char_to_decimal.h"
80 
81 	/*
82 	 * If we read any characters beyond the end of the accepted
83 	 * token, try to push them back.
84 	 */
85 	if (fortran_conventions < 0) {
86 		/* in C99 mode, push back at most one character */
87 		if (cp >= *ppc && current != EOF && myungetc(current, pf)
88 		    != EOF) {
89 			cp--;
90 			nread--;
91 		}
92 	} else {
93 		while (cp >= *ppc) {
94 			if (myungetc((int)(unsigned char)*cp, pf) == EOF)
95 				break;
96 			cp--;
97 			nread--;
98 		}
99 	}
100 
101 	*++cp = '\0';
102 	*pnread = nread;
103 }
104