286 lines
6.3 KiB
C
286 lines
6.3 KiB
C
/*****************************************************************************
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*
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* $Id: rfcaddr.c,v 1.7 2004/02/21 14:24:04 mbroek Exp $
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* Purpose ...............: MBSE BBS Common Library - RFC address functions
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*
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*****************************************************************************
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* Copyright (C) 1997-2004
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*
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* Michiel Broek FIDO: 2:280/2802
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* Beekmansbos 10
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* 1971 BV IJmuiden
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* the Netherlands
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*
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* This file is part of MBSE BBS.
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*
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* This BBS is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* MBSE BBS is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with MBSE BBS; see the file COPYING. If not, write to the Free
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* Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*****************************************************************************/
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#include "../config.h"
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#include "mbselib.h"
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extern int addrerror;
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static char *errname[] = {
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(char *)"nested <>",
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(char *)"multiple <>",
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(char *)"unmatched <>""()",
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(char *)"badtoken",
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(char *)"badstructure",
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};
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char *addrerrstr(int err)
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{
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int i;
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static char buf[128];
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buf[0] = '\0';
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for (i = 0; i < ADDR_ERRMAX; i++)
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if (err & (1 << i)) {
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if (buf[0])
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strcat(buf,",");
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strcat(buf, errname[i]);
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}
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if (buf[0] == '\0')
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strcpy(buf,"none");
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return buf;
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}
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void tidyrfcaddr(parsedaddr addr)
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{
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if (addr.target)
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free(addr.target);
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if (addr.remainder)
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free(addr.remainder);
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if (addr.comment)
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free(addr.comment);
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}
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parsedaddr parserfcaddr(char *s)
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{
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parsedaddr result;
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char *inbrackets = NULL, *outbrackets = NULL, *cleanbuf = NULL, *combuf = NULL;
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char *t, *r, *c, *p, *q, **x;
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int quotes, brackets, escaped, anglecomplete;
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char *firstat, *lastat, *percent, *colon, *comma, *exclam;
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result.target = NULL;
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result.remainder = NULL;
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result.comment = NULL;
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addrerror = 0;
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if ((s == NULL) || (*s == '\0'))
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return result;
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/*
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* First check if there is an "angled" portion
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*/
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inbrackets = calloc(strlen(s)+1, sizeof(char));
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outbrackets = calloc(strlen(s)+1, sizeof(char));
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brackets = quotes = escaped = anglecomplete = 0;
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for (p = s,q = inbrackets, r = outbrackets, x = &r; *p; p++) {
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if (escaped)
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escaped = FALSE;
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else /* process all special chars */
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switch (*p) {
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case '\\': escaped = TRUE; break;
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case '\"': quotes = !quotes; break;
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case '<': if (quotes)
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break;
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if (brackets)
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addrerror |= ADDR_NESTED;
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if (anglecomplete)
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addrerror |= ADDR_MULTIPLE;
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brackets++;
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x = &q;
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break;
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case '>': if (quotes)
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break;
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if (brackets)
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brackets--;
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else
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addrerror |= ADDR_UNMATCHED;
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if (!brackets)
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anglecomplete = 1;
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break;
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}
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*((*x)++) = *p;
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if (!brackets)
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x = &r;
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}
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*q = '\0';
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*r = '\0';
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if (brackets || quotes)
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addrerror |= ADDR_UNMATCHED;
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if (addrerror)
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goto leave1;
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cleanbuf = calloc(strlen(s)+1, sizeof(char));
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combuf = calloc(strlen(s)+1, sizeof(char));
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if (*inbrackets) { /* there actually is an angled portion */
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strcpy(combuf, outbrackets);
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c = combuf + strlen(combuf);
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p = inbrackets + 1;
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*(p+strlen(p)-1) = '\0';
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} else {
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c = combuf;
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p = outbrackets;
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}
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/* OK, now we have result.comment filled with wat was outside
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angle brackets, c pointing past the end of it,
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p pointing to what is supposed to be address, with angle
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brackets already removed */
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quotes = brackets = escaped = 0;
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for (r = cleanbuf, x = &r; *p; p++) {
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if (escaped) {
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escaped=0;
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*((*x)++)=*p;
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} else /* process all special chars */
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if (isspace(*p)) {
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if ((quotes) || (brackets))
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*((*x)++) = *p;
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} else
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switch (*p) {
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case '\\': escaped=1;
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/* pass backslash itself only inside quotes
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and comments, or for the special cases
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\" and \\ otherwise eat it away */
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if ((quotes) || (brackets))
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*((*x)++) = *p;
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else if ((*(p+1)=='"') || (*(p+1)=='\\'))
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*((*x)++) = *p;
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break;
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case '\"': quotes = !quotes;
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*((*x)++) = *p;
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break;
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case '(':
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brackets++;
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x = &c;
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break;
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case ')':
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if (brackets)
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brackets--;
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else
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addrerror |= ADDR_UNMATCHED;
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if (!brackets)
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x = &r;
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break;
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default:
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*((*x)++) = *p;
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break;
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}
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}
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*r = '\0';
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*c = '\0';
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if (brackets || quotes)
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addrerror |= ADDR_UNMATCHED;
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if (addrerror)
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goto leave2;
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/* OK, now we have inangles buffer filled with the 'clean' address,
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all comments removed, and result.comment is ready filled */
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/* seach for special chars that are outside quotes */
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firstat = lastat = percent = colon = comma = exclam = NULL;
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quotes = 0; escaped = 0;
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for (p = cleanbuf; *p; p++)
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if (*p == '\\')
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p++;
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else if (*p == '\"')
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quotes = !quotes;
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else if (!quotes)
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switch (*p) {
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case '@':
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if (!firstat)
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firstat = p;
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lastat = p;
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break;
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case '%':
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percent = p;
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break;
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case ':':
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colon = p;
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break;
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case ',':
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comma = p;
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break;
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case '!':
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if (!exclam)
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exclam = p;
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break;
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}
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if ((firstat == cleanbuf) && colon) {
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if (comma && (comma < colon)) {
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*comma = '\0';
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r = comma + 1;
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} else {
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*colon = '\0';
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r = colon + 1;
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}
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t = firstat + 1;
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} else if (lastat) {
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*lastat = '\0';
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r = cleanbuf;
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t = lastat + 1;
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} else if (exclam) {
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*exclam = '\0';
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r = exclam + 1;
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t = cleanbuf;
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} else if (percent) {
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*percent = '\0';
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r = cleanbuf;
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t = percent + 1;
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} else {
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/* unquote it if necessary */
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if ((*cleanbuf == '\"') && (*(p = (cleanbuf+strlen(cleanbuf)-1)) == '\"')) {
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*p = '\0';
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r = cleanbuf + 1;
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} else
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r = cleanbuf;
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t = NULL;
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}
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if (t && (*t != '\0'))
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result.target = xstrcpy(t);
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if (r && (*r != '\0'))
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result.remainder = xstrcpy(r);
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if (*combuf != '\0')
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result.comment = xstrcpy(combuf);
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leave1: /* this is also normal exit */
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free(cleanbuf);
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free(combuf);
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free(inbrackets);
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free(outbrackets);
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return result;
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leave2: /* if error found on second stage, free */
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free(cleanbuf);
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free(combuf);
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return result;
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}
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