1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
.\" Part of publib.
.\"
.\" Copyright (c) 1994-2006 Lars Wirzenius. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\"
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\"
.\" 2. Redistributions in binary form must reproduce the above
.\" copyright notice, this list of conditions and the following
.\" disclaimer in the documentation and/or other materials provided
.\" with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
.\" OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
.\" DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
.\" GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
.\" NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
.\" SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.\" part of publib
.\" "@(#)publib-strutil:$Id: strcstr.3,v 1.3 1996/07/16 12:25:39 liw Exp $"
.\"
.TH STRCSTR 3 "C Programmer's Manual" Publib "C Programmer's Manual"
.SH NAME
strcstr \- convert memory block to printable C string notation
.SH SYNOPSIS
.nf
#include <publib.h>
void \fBstrcstr\fR(char *\fIstr\fR, size_t \fImax\fR, const void *\fIblock\fR, size_t \fIn\fR);
.SH DESCRIPTION
\fIstrcstr\fR converts the contents of an arbitrary memory block (which need
not be a zero terminated string) into a printable notation using normal
C string literal syntax. This can be used for example to store potentially
binary data in a file, or in debugging outputs.
.PP
All characters for which there is a simple shorthand escape sequence (',
", ?, \\, \\a, \\b, \\f, \\n, \\r, \\t, \\v) are stored using that
notation. \\0 is stored as \\0. All other non-printable characters are
stored using a hexadecimal escape sequence. All other printable
characters are stored as is.
.PP
The \fIisprint\fR(3) macro is used to determine whether a character is
printable (i.e., whether it is printed as is, or using special notation).
Therefore, the output depends on the locale.
.SH "RETURN VALUE"
\fIstrcstr\fR returns nothing.
.SH EXAMPLE
The following code dumps input to the standard output in a
guaranteed (modulo locale bugs) printable format.
It might be used for debugging.
.sp 1
.nf
.in +5
#include <stdio.h>
#include <publib.h>
int main(void) {
char line[512];
char cstr[512*(CHAR_BIT/4+1+2)+1]; /* +2 for \\x, +1 for \\0,
the rest to be able to
store the hex code for
512 chars. */
while (fgets(line, sizeof(line), stdin) != NULL) {
strcstr(cstr, sizeof(cstr), line, strlen(line));
printf("%s\n", cstr);
}
return 0;
}
.in -5
.SH "SEE ALSO"
publib(3), strins(3)
.SH AUTHOR
Lars Wirzenius (lars.wirzenius@helsinki.fi)
|
