diff options
Diffstat (limited to 'contrib/ntp/libopts/cook.c')
| -rw-r--r-- | contrib/ntp/libopts/cook.c | 354 |
1 files changed, 354 insertions, 0 deletions
diff --git a/contrib/ntp/libopts/cook.c b/contrib/ntp/libopts/cook.c new file mode 100644 index 0000000..bebd123 --- /dev/null +++ b/contrib/ntp/libopts/cook.c @@ -0,0 +1,354 @@ + +/* + * $Id: cook.c,v 4.10 2007/02/04 17:44:12 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 1992-2007 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: + unsigned 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 is 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 */ |
