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Check-in Number:
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240 | |
| Date: |
2000-Dec-15 13:38:22 (local)
2000-Dec-15 12:38:22 (UTC) |
| User: | simons |
| Branch: | |
| Comment: |
Initial revision |
| Tickets: |
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| Inspections: |
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| Files: |
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ossp-pkg/petidomo/librfc822/decomment.c -> 1.1
*** /dev/null Sat Nov 23 06:12:56 2024
--- - Sat Nov 23 06:12:59 2024
***************
*** 0 ****
--- 1,217 ----
+ /*
+ * $Source: /v/ossp/cvs/ossp-pkg/petidomo/librfc822/decomment.c,v $
+ * $Revision: 1.1 $
+ * $Date: 2000/12/16 12:38:22 $
+ *
+ * Copyright (C) 1997 by CyberSolutions GmbH.
+ * All rights reserved.
+ */
+
+ #include <stdio.h>
+ #include <stdlib.h>
+ #include <errno.h>
+ #include <assert.h>
+ #ifdef DEBUG_DMALLOC
+ # include <dmalloc.h>
+ #endif
+
+ #include "rfc822.h"
+
+ static const char *
+ read_until_next_quote(const char * p)
+ {
+ while (*p) {
+ if (*p == '"') {
+ break;
+ }
+ if (*p == '\\' && p[1] != '\0') {
+ p += 2;
+ continue;
+ }
+ p++;
+ }
+ return p;
+ }
+
+ static const char *
+ read_until_close_bracket(const char * p)
+ {
+ while (*p) {
+ if (*p == ')') {
+ break;
+ }
+ if (*p == '(') {
+ p = read_until_close_bracket(p+1);
+ if (*p == '\0')
+ break;
+ else {
+ p++;
+ continue;
+ }
+ }
+ else if (*p == '\\' && p[1] != '\0') {
+ p += 2;
+ continue;
+ }
+ else if (*p == '"') {
+ p = read_until_next_quote(p+1);
+ if (*p == '\0')
+ break;
+ else {
+ p++;
+ continue;
+ }
+ }
+ p++;
+ }
+ return p;
+ }
+
+ /* remove all comments from an rfc822 address
+
+ This routine takes as argument an address string conforming to the
+ RFC822 syntax and removes all comments from it, returning the
+ result in the pointer specified as second argument.
+
+ This is very useful if you want to parse the address with a context
+ free grammer parser, like yacc, because recognizing the various
+ forms of commenting with a BNF grammar is very complicated.
+
+ RETURNS: The routine returns an integer describing whether the
+ decommenting process succeeded or not. In case of an error, the
+ return code described the reason for failure.
+
+ RFC822_OK: Success.
+
+ RFC822_FATAL_ERROR: A fatal system error occured, like malloc()
+ failed. The global errno variable will be set accordingly.
+
+ RFC822_UNCLOSED_COMMENT: A "(comment)"-like expression was not
+ closed properly.
+
+ RFC822_UNMATCHED_CLOSE_BRACKET: A close bracket (")") was
+ encountered outside the comment context.
+
+ RFC822_UNCLOSED_QUOTE: A quoted `"string"'-like expression was not
+ closed properly.
+
+ RFC822_UNCLOSED_ANGEL_BRACKET: An "<address>"-like expression was
+ not closed properly.
+
+ RFC822_NESTED_ANGEL_BRACKET: An open angel bracket ("<") was
+ encountered inside the "<address>" context.
+
+ RFC822_UNMATCHED_CLOSE_ANGEL_BRACKET: A close angel bracket (">") was
+ encountered outside the "<address>" context.
+
+ RFC822_SYNTAX_ERROR: The address does not follow the rfc822 syntax.
+
+ NOTE: The returned by rfc822_decomment() has been allocated with
+ malloc(3) and should be freed when not needed anymore.
+
+ AUTHOR: Peter Simons <simons@rhein.de>
+
+ */
+
+ int
+ rfc822_decomment(const char * source /* String containing a formatted rfc822 address. */,
+ char ** destination /* Location where to store the parsed string. */)
+ {
+ char * buffer,
+ * address_start,
+ * p;
+ const char * s;
+ int in_quote,
+ angel_bracket_count;
+
+
+ /* Sanity checks. */
+
+ assert(source != NULL);
+ if (!source || *source == '\0') {
+ errno = EINVAL;
+ return NULL;
+ }
+
+ /* Allocate buffer. */
+
+ buffer = malloc(strlen(source)+1);
+ if (buffer == NULL) {
+ errno = ENOMEM;
+ return RFC822_FATAL_ERROR;
+ }
+
+ /* Let's parse it. */
+
+ address_start = p = buffer;
+ s = source;
+ in_quote = 0;
+ angel_bracket_count = 0;
+
+ while(*s) {
+
+ if (*s == '"') {
+ in_quote = !in_quote;
+ }
+ else if (!in_quote && *s == '(') {
+ s = read_until_close_bracket(s+1);
+ if (*s == '\0') {
+ free(buffer);
+ return RFC822_UNCLOSED_COMMENT;
+ }
+ s++;
+ *p++ = ' ';
+ continue;
+ }
+ else if (!in_quote && *s == ')') {
+ free(buffer);
+ return RFC822_UNMATCHED_CLOSE_BRACKET;
+ }
+ else if (!in_quote && *s == '<') {
+ if (angel_bracket_count > 0) {
+ free(buffer);
+ return RFC822_NESTED_ANGEL_BRACKET;
+ }
+ s++;
+ p = address_start;
+ *p = '\0';
+ angel_bracket_count++;
+ continue;
+ }
+ else if (!in_quote && *s == '>') {
+ if (angel_bracket_count == 0) {
+ free(buffer);
+ return RFC822_UNMATCHED_CLOSE_ANGEL_BRACKET;
+ }
+ *p = '\0';
+ angel_bracket_count--;
+ break;
+ }
+ else if (!in_quote && *s == '\\') {
+ if (s[1] != '\0') {
+ *p++ = *s++;
+ }
+ else {
+ free(buffer);
+ return RFC822_SYNTAX_ERROR;
+ }
+ }
+
+
+ *p++ = *s++;
+ }
+ *p = '\0';
+ if (in_quote) {
+ free(buffer);
+ return RFC822_UNCLOSED_QUOTE;
+ }
+
+ if (angel_bracket_count > 0) {
+ free(buffer);
+ return RFC822_UNCLOSED_ANGEL_BRACKET;
+ }
+
+
+ *destination = buffer;
+ return RFC822_OK;
+ }
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