/usr/share/systemtap/runtime/string.c is in systemtap-common 1.7-1+deb7u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 | /* -*- linux-c -*-
* String Functions
* Copyright (C) 2005, 2006, 2007, 2009 Red Hat Inc.
*
* This file is part of systemtap, and is free software. You can
* redistribute it and/or modify it under the terms of the GNU General
* Public License (GPL); either version 2, or (at your option) any
* later version.
*/
#ifndef _STRING_C_
#define _STRING_C_
#include "string.h"
/** @file string.c
* @brief Implements string functions.
*/
/** @addtogroup string String Functions
*
* @{
*/
/** Sprintf into a string.
* Like printf, except output goes into a string.
*
* NB: these are script language printf formatting directives, where
* %d ints are 64-bits etc, so we can't use gcc level attribute printf
* to type-check the arguments.
*
* @param str string
* @param fmt A printf-style format string followed by a
* variable number of args.
*/
static int _stp_snprintf(char *buf, size_t size, const char *fmt, ...)
{
va_list args;
int i;
va_start(args, fmt);
i = _stp_vsnprintf(buf,size,fmt,args);
va_end(args);
return i;
}
static int _stp_vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
{
unsigned i = _stp_vsnprintf(buf,size,fmt,args);
return (i >= size) ? (size - 1) : i;
}
/** Return a printable text string.
*
* Takes a string, and any ASCII characters that are not printable are
* replaced by the corresponding escape sequence in the returned
* string.
*
* @param outstr Output string pointer
* @param in Input string pointer
* @param len Maximum length of string to return not including terminating 0.
* 0 means MAXSTRINGLEN.
* @param quoted Put double quotes around the string. If input string is truncated
* in will have "..." after the second quote.
* @param user Set this to indicate the input string pointer is a userspace pointer.
*/
static void _stp_text_str(char *outstr, char *in, int len, int quoted, int user)
{
char c, *out = outstr;
if (len <= 0 || len > MAXSTRINGLEN-1)
len = MAXSTRINGLEN-1;
if (quoted) {
len = max(len, 5) - 2;
*out++ = '"';
}
if (user) {
if (!access_ok(VERIFY_READ, (char __user *)in, 1))
goto bad;
if (__stp_get_user(c, in))
goto bad;
} else
c = *in;
while (c && len > 0) {
int num = 1;
if (isprint(c) && isascii(c)
&& c != '"' && c != '\\') /* quoteworthy characters */
*out++ = c;
else {
switch (c) {
case '\a':
case '\b':
case '\f':
case '\n':
case '\r':
case '\t':
case '\v':
case '"':
case '\\':
num = 2;
break;
default:
num = 4;
break;
}
if (len < num)
break;
*out++ = '\\';
switch (c) {
case '\a':
*out++ = 'a';
break;
case '\b':
*out++ = 'b';
break;
case '\f':
*out++ = 'f';
break;
case '\n':
*out++ = 'n';
break;
case '\r':
*out++ = 'r';
break;
case '\t':
*out++ = 't';
break;
case '\v':
*out++ = 'v';
break;
case '"':
*out++ = '"';
break;
case '\\':
*out++ = '\\';
break;
default: /* output octal representation */
*out++ = to_oct_digit((c >> 6) & 03);
*out++ = to_oct_digit((c >> 3) & 07);
*out++ = to_oct_digit(c & 07);
break;
}
}
len -= num;
in++;
if (user) {
if (__stp_get_user(c, in))
goto bad;
} else
c = *in;
}
if (quoted) {
if (c) {
out = out - 3 + len;
*out++ = '"';
*out++ = '.';
*out++ = '.';
*out++ = '.';
} else
*out++ = '"';
}
*out = '\0';
return;
bad:
strlcpy (outstr, "<unknown>", len);
}
/** @} */
#endif /* _STRING_C_ */
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