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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2010 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Translate a string into C literal string constant notation.
*/
#include <stdio.h>
#include <ctype.h>
#include <_conv.h>
#include <c_literal_msg.h>
/*
* Convert characters to the form used by the C language to represent
* literal strings:
* - Printable characters are shown as themselves
* - Convert special characters to their 2-character escaped forms:
* alert (bell) \a
* backspace \b
* formfeed \f
* newline \n
* return \r
* horizontal tab \t
* vertical tab \v
* backspace \\
* single quote \'
* double quote \"
* - Display other non-printable characters as 4-character escaped
* octal constants.
*
* entry:
* buf - Buffer of characters to be processed
* n # of characters in buf to be processed
* outfunc - Function to be called to move output characters.
* uvalue - User value. This argument is passed to outfunc without
* examination. The caller can use it to pass additional
* information required by the callback.
*
* exit:
* The string has been processed, with the resulting data passed
* to outfunc for processing.
*/
void
conv_str_to_c_literal(const char *buf, size_t n,
Conv_str_to_c_literal_func_t *outfunc, void *uvalue)
{
char bs_buf[2]; /* For two-character backslash codes */
char octal_buf[10]; /* For \000 style octal constants */
bs_buf[0] = '\\';
while (n > 0) {
switch (*buf) {
case '\0':
bs_buf[1] = '0';
break;
case '\a':
bs_buf[1] = 'a';
break;
case '\b':
bs_buf[1] = 'b';
break;
case '\f':
bs_buf[1] = 'f';
break;
case '\n':
bs_buf[1] = 'n';
break;
case '\r':
bs_buf[1] = 'r';
break;
case '\t':
bs_buf[1] = 't';
break;
case '\v':
bs_buf[1] = 'v';
break;
case '\\':
bs_buf[1] = '\\';
break;
case '\'':
bs_buf[1] = '\'';
break;
case '"':
bs_buf[1] = '"';
break;
default:
bs_buf[1] = '\0';
}
if (bs_buf[1] != '\0') {
(*outfunc)(bs_buf, 2, uvalue);
buf++;
n--;
} else if (isprint(*buf)) {
/*
* Output the entire sequence of printable
* characters in a single shot.
*/
const char *start = buf;
size_t outlen = 0;
for (start = buf; (n > 0) && isprint(*buf); buf++, n--)
outlen++;
(*outfunc)(start, outlen, uvalue);
} else {
/* Generic unprintable character: Use octal notation */
(void) snprintf(octal_buf, sizeof (octal_buf),
MSG_ORIG(MSG_FMT_OCTCONST), (uchar_t)*buf);
(*outfunc)(octal_buf, strlen(octal_buf), uvalue);
buf++;
n--;
}
}
}
/*
* Given the pointer to the character following a '\' character in
* a C style literal, return the ASCII character code it represents,
* and advance the string pointer to the character following the last
* character in the escape sequence.
*
* entry:
* str - Address of string pointer to first character following
* the backslash.
*
* exit:
* If the character is not valid, -1 is returned. Otherwise
* it returns the ASCII code for the translated character, and
* *str has been advanced.
*/
int
conv_translate_c_esc(char **str)
{
char *s = *str;
int ch, i;
ch = *s++;
switch (ch) {
case 'a':
ch = '\a';
break;
case 'b':
ch = '\b';
break;
case 'f':
ch = '\f';
break;
case 'n':
ch = '\n';
break;
case 'r':
ch = '\r';
break;
case 't':
ch = '\t';
break;
case 'v':
ch = '\v';
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
/* Octal constant: There can be up to 3 digits */
ch -= '0';
for (i = 0; i < 2; i++) {
if ((*s < '0') || (*s > '7'))
break;
ch = (ch << 3) + (*s++ - '0');
}
break;
/*
* There are some cases where ch already has the desired value.
* These cases exist simply to remove the special meaning that
* character would otherwise have. We need to match them to
* prevent them from falling into the default error case.
*/
case '\\':
case '\'':
case '"':
break;
default:
ch = -1;
break;
}
*str = s;
return (ch);
}
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