xref: /titanic_51/usr/src/lib/libbc/libc/stdio/common/fputs.c (revision 42487ff1899d230ad6c2d55cf9573489ca5eb770)
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 1995 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 /*      Copyright (c) 1984 AT&T */
28 /*        All Rights Reserved   */
29 
30 #pragma ident	"%Z%%M%	%I%	%E% SMI"
31 
32 
33 /*LINTLIBRARY*/
34 /*
35  * This version writes directly to the buffer rather than looping on putc.
36  * Ptr args aren't checked for NULL because the program would be a
37  * catastrophic mess anyway.  Better to abort than just to return NULL.
38  */
39 #include <stdio.h>
40 #include "stdiom.h"
41 #include <errno.h>
42 #include <memory.h>
43 
44 static char	*memnulccpy(char *, char *, int, int);
45 
46 int
47 fputs(char *ptr, FILE *iop)
48 {
49 	int ndone = 0, n;
50 	unsigned char *cptr, *bufend;
51 	char *p;
52 	char c;
53 
54 	if (_WRTCHK(iop)) {
55 		iop->_flag |= _IOERR;
56 #ifdef POSIX
57 		errno = EBADF;
58 #endif	/* POSIX */
59 		return (EOF);
60 	}
61 	bufend = iop->_base + iop->_bufsiz;
62 
63 	if ((iop->_flag & _IONBF) == 0)  {
64 		if (iop->_flag & _IOLBF) {
65 			for ( ; ; ptr += n) {
66 				while ((n = bufend - (cptr = iop->_ptr)) <= 0)
67 					/* full buf */
68 					if (_xflsbuf(iop) == EOF)
69 						return(EOF);
70 				if ((p = memnulccpy((char *) cptr, ptr, '\n', n)) != NULL) {
71 					/*
72 					 * Copy terminated either because we
73 					 * saw a newline or we saw a NUL (end
74 					 * of string).
75 					 */
76 					c = *(p - 1);	/* last character moved */
77 					if (c == '\0')
78 						p--;	/* didn't write '\0' */
79 					n = p - (char *) cptr;
80 				}
81 				iop->_cnt -= n;
82 				iop->_ptr += n;
83 				_BUFSYNC(iop);
84 				ndone += n;
85 				if (p != NULL) {
86 					/*
87 					 * We found either a newline or a NUL.
88 					 * If we found a newline, flush the
89 					 * buffer.
90 					 * If we found a NUL, we're done.
91 					 */
92 					if (c == '\n') {
93 						if (_xflsbuf(iop) == EOF)
94 							return(EOF);
95 					} else {
96 						/* done */
97 						return(ndone);
98 					}
99 		       		}
100 			}
101 		} else {
102 			for ( ; ; ptr += n) {
103 				while ((n = bufend - (cptr = iop->_ptr)) <= 0)
104 					/* full buf */
105 					if (_xflsbuf(iop) == EOF)
106 						return(EOF);
107 				if ((p = memccpy((char *) cptr, ptr, '\0', n)) != NULL)
108 					n = (p - (char *) cptr) - 1;
109 				iop->_cnt -= n;
110 				iop->_ptr += n;
111 				_BUFSYNC(iop);
112 				ndone += n;
113 				if (p != NULL)  {
114 					/* done */
115 		       			return(ndone);
116 		       		}
117 			}
118 		}
119 	}  else  {
120 		/* write out to an unbuffered file */
121 		return (write(iop->_file, ptr, strlen(ptr)));
122 	}
123 }
124 
125 /*
126  * Copy s2 to s1, stopping if character c or a NUL is copied.
127  * Copy no more than n bytes.
128  * Return a pointer to the byte after character c or NUL in the copy,
129  * or NULL if c or NUL is not found in the first n bytes.
130  */
131 static char *
132 memnulccpy(char *s1, char *s2, int c, int n)
133 {
134 	int cmoved;
135 
136 	while (--n >= 0) {
137 		cmoved = *s2++;
138 		if ((*s1++ = cmoved) == '\0' || cmoved == c)
139 			return (s1);
140 	}
141 	return (0);
142 }
143