357 lines
11 KiB
C
357 lines
11 KiB
C
|
/* $NetBSD: cook.c,v 1.1.1.1 2007/01/06 16:06:09 kardel Exp $ */
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Id: cook.c,v 4.7 2006/09/28 01:26:33 bkorb Exp
|
||
|
|
* Time-stamp: "2006-09-24 15:21:02 bkorb"
|
||
|
|
*
|
||
|
|
* This file contains the routines that deal with processing quoted strings
|
||
|
|
* into an internal format.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Automated Options copyright 1992-2006 Bruce Korb
|
||
|
|
*
|
||
|
|
* Automated Options is free software.
|
||
|
|
* You may redistribute it and/or modify it under the terms of the
|
||
|
|
* GNU General Public License, as published by the Free Software
|
||
|
|
* Foundation; either version 2, or (at your option) any later version.
|
||
|
|
*
|
||
|
|
* Automated Options is distributed in the hope that it will be useful,
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
* GNU General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU General Public License
|
||
|
|
* along with Automated Options. See the file "COPYING". If not,
|
||
|
|
* write to: The Free Software Foundation, Inc.,
|
||
|
|
* 51 Franklin Street, Fifth Floor,
|
||
|
|
* Boston, MA 02110-1301, USA.
|
||
|
|
*
|
||
|
|
* As a special exception, Bruce Korb gives permission for additional
|
||
|
|
* uses of the text contained in his release of AutoOpts.
|
||
|
|
*
|
||
|
|
* The exception is that, if you link the AutoOpts library with other
|
||
|
|
* files to produce an executable, this does not by itself cause the
|
||
|
|
* resulting executable to be covered by the GNU General Public License.
|
||
|
|
* Your use of that executable is in no way restricted on account of
|
||
|
|
* linking the AutoOpts library code into it.
|
||
|
|
*
|
||
|
|
* This exception does not however invalidate any other reasons why
|
||
|
|
* the executable file might be covered by the GNU General Public License.
|
||
|
|
*
|
||
|
|
* This exception applies only to the code released by Bruce Korb under
|
||
|
|
* the name AutoOpts. If you copy code from other sources under the
|
||
|
|
* General Public License into a copy of AutoOpts, as the General Public
|
||
|
|
* License permits, the exception does not apply to the code that you add
|
||
|
|
* in this way. To avoid misleading anyone as to the status of such
|
||
|
|
* modified files, you must delete this exception notice from them.
|
||
|
|
*
|
||
|
|
* If you write modifications of your own for AutoOpts, it is your choice
|
||
|
|
* whether to permit this exception to apply to your modifications.
|
||
|
|
* If you do not wish that, delete this exception notice.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* = = = START-STATIC-FORWARD = = = */
|
||
|
|
/* static forward declarations maintained by :mkfwd */
|
||
|
|
/* = = = END-STATIC-FORWARD = = = */
|
||
|
|
|
||
|
|
/*=export_func ao_string_cook_escape_char
|
||
|
|
* private:
|
||
|
|
*
|
||
|
|
* what: escape-process a string fragment
|
||
|
|
* arg: + char const* + pzScan + points to character after the escape +
|
||
|
|
* arg: + char* + pRes + Where to put the result byte +
|
||
|
|
* arg: + u_int + nl_ch + replacement char if scanned char is \n +
|
||
|
|
*
|
||
|
|
* ret-type: unsigned int
|
||
|
|
* ret-desc: The number of bytes consumed processing the escaped character.
|
||
|
|
*
|
||
|
|
* doc:
|
||
|
|
*
|
||
|
|
* This function converts "t" into "\t" and all your other favorite
|
||
|
|
* escapes, including numeric ones: hex and ocatal, too.
|
||
|
|
* The returned result tells the caller how far to advance the
|
||
|
|
* scan pointer (passed in). The default is to just pass through the
|
||
|
|
* escaped character and advance the scan by one.
|
||
|
|
*
|
||
|
|
* Some applications need to keep an escaped newline, others need to
|
||
|
|
* suppress it. This is accomplished by supplying a '\n' replacement
|
||
|
|
* character that is different from \n, if need be. For example, use
|
||
|
|
* 0x7F and never emit a 0x7F.
|
||
|
|
*
|
||
|
|
* err: @code{NULL} is returned if the string(s) is/are mal-formed.
|
||
|
|
=*/
|
||
|
|
unsigned int
|
||
|
|
ao_string_cook_escape_char( char const* pzIn, char* pRes, u_int nl )
|
||
|
|
{
|
||
|
|
unsigned int res = 1;
|
||
|
|
|
||
|
|
switch (*pRes = *pzIn++) {
|
||
|
|
case NUL: /* NUL - end of input string */
|
||
|
|
return 0;
|
||
|
|
case '\r':
|
||
|
|
if (*pzIn != '\n')
|
||
|
|
return 1;
|
||
|
|
res++;
|
||
|
|
/* FALLTHROUGH */
|
||
|
|
case '\n': /* NL - emit newline */
|
||
|
|
*pRes = (char)nl;
|
||
|
|
return res;
|
||
|
|
|
||
|
|
case 'a': *pRes = '\a'; break;
|
||
|
|
case 'b': *pRes = '\b'; break;
|
||
|
|
case 'f': *pRes = '\f'; break;
|
||
|
|
case 'n': *pRes = '\n'; break;
|
||
|
|
case 'r': *pRes = '\r'; break;
|
||
|
|
case 't': *pRes = '\t'; break;
|
||
|
|
case 'v': *pRes = '\v'; break;
|
||
|
|
|
||
|
|
case 'x': /* HEX Escape */
|
||
|
|
if (isxdigit( (int)*pzIn )) {
|
||
|
|
unsigned int val;
|
||
|
|
unsigned char ch = *pzIn++;
|
||
|
|
|
||
|
|
if ((ch >= 'A') && (ch <= 'F'))
|
||
|
|
val = 10 + (ch - 'A');
|
||
|
|
else if ((ch >= 'a') && (ch <= 'f'))
|
||
|
|
val = 10 + (ch - 'a');
|
||
|
|
else val = ch - '0';
|
||
|
|
|
||
|
|
ch = *pzIn;
|
||
|
|
|
||
|
|
if (! isxdigit( ch )) {
|
||
|
|
*pRes = val;
|
||
|
|
res = 2;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
val <<= 4;
|
||
|
|
if ((ch >= 'A') && (ch <= 'F'))
|
||
|
|
val += 10 + (ch - 'A');
|
||
|
|
else if ((ch >= 'a') && (ch <= 'f'))
|
||
|
|
val += 10 + (ch - 'a');
|
||
|
|
else val += ch - '0';
|
||
|
|
|
||
|
|
res = 3;
|
||
|
|
*pRes = val;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
default:
|
||
|
|
/*
|
||
|
|
* IF the character copied was an octal digit,
|
||
|
|
* THEN set the output character to an octal value
|
||
|
|
*/
|
||
|
|
if (isdigit( (int)*pRes ) && (*pRes < '8')) {
|
||
|
|
unsigned int val = *pRes - '0';
|
||
|
|
unsigned char ch = *pzIn++;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* IF the second character is *not* an octal digit,
|
||
|
|
* THEN save the value and bail
|
||
|
|
*/
|
||
|
|
if ((ch < '0') || (ch > '7')) {
|
||
|
|
*pRes = val;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
val = (val<<3) + (ch - '0');
|
||
|
|
ch = *pzIn;
|
||
|
|
res = 2;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* IF the THIRD character is *not* an octal digit,
|
||
|
|
* THEN save the value and bail
|
||
|
|
*/
|
||
|
|
if ((ch < '0') || (ch > '7')) {
|
||
|
|
*pRes = val;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* IF the new value would not be too large,
|
||
|
|
* THEN add on the third and last character value
|
||
|
|
*/
|
||
|
|
if ((val<<3) < 0xFF) {
|
||
|
|
val = (val<<3) + (ch - '0');
|
||
|
|
res = 3;
|
||
|
|
}
|
||
|
|
|
||
|
|
*pRes = val;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return res;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
|
||
|
|
*
|
||
|
|
* A quoted string has been found.
|
||
|
|
* Find the end of it and compress any escape sequences.
|
||
|
|
*/
|
||
|
|
/*=export_func ao_string_cook
|
||
|
|
* private:
|
||
|
|
*
|
||
|
|
* what: concatenate and escape-process strings
|
||
|
|
* arg: + char* + pzScan + The *MODIFIABLE* input buffer +
|
||
|
|
* arg: + int* + pLineCt + The (possibly NULL) pointer to a line count +
|
||
|
|
*
|
||
|
|
* ret-type: char*
|
||
|
|
* ret-desc: The address of the text following the processed strings.
|
||
|
|
* The return value is NULL if the strings are ill-formed.
|
||
|
|
*
|
||
|
|
* doc:
|
||
|
|
*
|
||
|
|
* A series of one or more quoted strings are concatenated together.
|
||
|
|
* If they are quoted with double quotes (@code{"}), then backslash
|
||
|
|
* escapes are processed per the C programming language. If they are
|
||
|
|
* single quote strings, then the backslashes are honored only when they
|
||
|
|
* precede another backslash or a single quote character.
|
||
|
|
*
|
||
|
|
* err: @code{NULL} is returned if the string(s) is/are mal-formed.
|
||
|
|
=*/
|
||
|
|
char*
|
||
|
|
ao_string_cook( char* pzScan, int* pLineCt )
|
||
|
|
{
|
||
|
|
int l = 0;
|
||
|
|
char q = *pzScan;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* It is a quoted string. Process the escape sequence characters
|
||
|
|
* (in the set "abfnrtv") and make sure we find a closing quote.
|
||
|
|
*/
|
||
|
|
char* pzD = pzScan++;
|
||
|
|
char* pzS = pzScan;
|
||
|
|
|
||
|
|
if (pLineCt == NULL)
|
||
|
|
pLineCt = &l;
|
||
|
|
|
||
|
|
for (;;) {
|
||
|
|
/*
|
||
|
|
* IF the next character is the quote character, THEN we may end the
|
||
|
|
* string. We end it unless the next non-blank character *after* the
|
||
|
|
* string happens to also be a quote. If it is, then we will change
|
||
|
|
* our quote character to the new quote character and continue
|
||
|
|
* condensing text.
|
||
|
|
*/
|
||
|
|
while (*pzS == q) {
|
||
|
|
*pzD = NUL; /* This is probably the end of the line */
|
||
|
|
pzS++;
|
||
|
|
|
||
|
|
scan_for_quote:
|
||
|
|
while (isspace((int)*pzS))
|
||
|
|
if (*(pzS++) == '\n')
|
||
|
|
(*pLineCt)++;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* IF the next character is a quote character,
|
||
|
|
* THEN we will concatenate the strings.
|
||
|
|
*/
|
||
|
|
switch (*pzS) {
|
||
|
|
case '"':
|
||
|
|
case '\'':
|
||
|
|
break;
|
||
|
|
|
||
|
|
case '/':
|
||
|
|
/*
|
||
|
|
* Allow for a comment embedded in the concatenated string.
|
||
|
|
*/
|
||
|
|
switch (pzS[1]) {
|
||
|
|
default: return NULL;
|
||
|
|
case '/':
|
||
|
|
/*
|
||
|
|
* Skip to end of line
|
||
|
|
*/
|
||
|
|
pzS = strchr( pzS, '\n' );
|
||
|
|
if (pzS == NULL)
|
||
|
|
return NULL;
|
||
|
|
(*pLineCt)++;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case '*':
|
||
|
|
{
|
||
|
|
char* p = strstr( pzS+2, "*/" );
|
||
|
|
/*
|
||
|
|
* Skip to terminating star slash
|
||
|
|
*/
|
||
|
|
if (p == NULL)
|
||
|
|
return NULL;
|
||
|
|
while (pzS < p) {
|
||
|
|
if (*(pzS++) == '\n')
|
||
|
|
(*pLineCt)++;
|
||
|
|
}
|
||
|
|
|
||
|
|
pzS = p + 2;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
goto scan_for_quote;
|
||
|
|
|
||
|
|
default:
|
||
|
|
/*
|
||
|
|
* The next non-whitespace character is not a quote.
|
||
|
|
* The series of quoted strings has come to an end.
|
||
|
|
*/
|
||
|
|
return pzS;
|
||
|
|
}
|
||
|
|
|
||
|
|
q = *(pzS++); /* assign new quote character and advance scan */
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* We are inside a quoted string. Copy text.
|
||
|
|
*/
|
||
|
|
switch (*(pzD++) = *(pzS++)) {
|
||
|
|
case NUL:
|
||
|
|
return NULL;
|
||
|
|
|
||
|
|
case '\n':
|
||
|
|
(*pLineCt)++;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case '\\':
|
||
|
|
/*
|
||
|
|
* IF we are escaping a new line,
|
||
|
|
* THEN drop both the escape and the newline from
|
||
|
|
* the result string.
|
||
|
|
*/
|
||
|
|
if (*pzS == '\n') {
|
||
|
|
pzS++;
|
||
|
|
pzD--;
|
||
|
|
(*pLineCt)++;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* ELSE IF the quote character is '"' or '`',
|
||
|
|
* THEN we do the full escape character processing
|
||
|
|
*/
|
||
|
|
else if (q != '\'') {
|
||
|
|
int ct = ao_string_cook_escape_char( pzS, pzD-1, (u_int)'\n' );
|
||
|
|
if (ct == 0)
|
||
|
|
return NULL;
|
||
|
|
|
||
|
|
pzS += ct;
|
||
|
|
} /* if (q != '\'') */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* OTHERWISE, we only process "\\", "\'" and "\#" sequences.
|
||
|
|
* The latter only to easily hide preprocessing directives.
|
||
|
|
*/
|
||
|
|
else switch (*pzS) {
|
||
|
|
case '\\':
|
||
|
|
case '\'':
|
||
|
|
case '#':
|
||
|
|
pzD[-1] = *pzS++;
|
||
|
|
}
|
||
|
|
} /* switch (*(pzD++) = *(pzS++)) */
|
||
|
|
} /* for (;;) */
|
||
|
|
}
|
||
|
|
/*
|
||
|
|
* Local Variables:
|
||
|
|
* mode: C
|
||
|
|
* c-file-style: "stroustrup"
|
||
|
|
* indent-tabs-mode: nil
|
||
|
|
* End:
|
||
|
|
* end of autoopts/cook.c */
|