+++ /dev/null
-/* $Id: wire.c 7258 2005-06-06 03:14:45Z eagle $
-**
-** Wire format article utilities.
-**
-** Originally written by Alex Kiernan (alex.kiernan@thus.net)
-**
-** These routines manipulate wire format articles; in particular, they should
-** be safe in the presence of embedded NULs. They assume wire format
-** conventions (\r\n as a line ending, in particular) and will not work with
-** articles in native format.
-**
-** The functions in this file take const char * pointers and return char *
-** pointers so that they can work on both const char * and char * article
-** bodies without changing the const sense. This unfortunately means that
-** the routines in this file will produce warnings about const being cast
-** away. To avoid those, one would need to duplicate all the code in this
-** file or use C++.
-*/
-
-#include "config.h"
-#include "clibrary.h"
-#include <assert.h>
-
-#include "inn/wire.h"
-#include "libinn.h"
-
-/*
-** Given a pointer to the start of an article, locate the first octet of the
-** body (which may be the octet beyond the end of the buffer if your article
-** is bodiless).
-*/
-char *
-wire_findbody(const char *article, size_t length)
-{
- char *p;
- const char *end;
-
- /* Handle the degenerate case of an article with no headers. */
- if (length > 5 && article[0] == '\r' && article[1] == '\n')
- return (char *) article + 2;
-
- /* Jump from \r to \r and give up if we're too close to the end. */
- end = article + length;
- for (p = (char *) article; (p + 4) <= end; ++p) {
- p = memchr(p, '\r', end - p - 3);
- if (p == NULL)
- break;
- if (memcmp(p, "\r\n\r\n", 4) == 0) {
- p += 4;
- return p;
- }
- }
- return NULL;
-}
-
-
-/*
-** Given a pointer into an article and a pointer to the last octet of the
-** article, find the next line ending and return a pointer to the first
-** character after that line ending. If no line ending is found in the
-** article or if it is at the end of the article, return NULL.
-*/
-char *
-wire_nextline(const char *article, const char *end)
-{
- char *p;
-
- for (p = (char *) article; (p + 2) <= end; ++p) {
- p = memchr(p, '\r', end - p - 2);
- if (p == NULL)
- break;
- if (p[1] == '\n') {
- p += 2;
- return p;
- }
- }
- return NULL;
-}
-
-
-/*
-** Returns true if line is the beginning of a valid header for header, also
-** taking the length of the header name as a third argument. Assumes that
-** there is at least length + 2 bytes of data at line, and that the header
-** name doesn't contain nul.
-*/
-static bool
-isheader(const char *line, const char *header, size_t length)
-{
- if (line[length] != ':' || !ISWHITE(line[length + 1]))
- return false;
- return strncasecmp(line, header, length) == 0;
-}
-
-
-/*
-** Skip over folding whitespace, as defined by RFC 2822. Takes a pointer to
-** where to start skipping and a pointer to the end of the data, and will not
-** return a pointer past the end pointer. If skipping folding whitespace
-** takes us past the end of data, return NULL.
-*/
-static char *
-skip_fws(char *text, const char *end)
-{
- char *p;
-
- for (p = text; p <= end; p++) {
- if (p < end + 1 && p[0] == '\r' && p[1] == '\n' && ISWHITE(p[2]))
- p += 2;
- if (!ISWHITE(*p))
- return p;
- }
- return NULL;
-}
-
-
-/*
-** Given a pointer to the start of the article, the article length, and the
-** header to look for, find the first occurance of that header in the
-** article. Skip over headers with no content, but allow for headers that
-** are folded before the first text in the header. If no matching headers
-** with content other than spaces and tabs are found, return NULL.
-*/
-char *
-wire_findheader(const char *article, size_t length, const char *header)
-{
- char *p;
- const char *end;
- ptrdiff_t headerlen;
-
- headerlen = strlen(header);
- end = article + length - 1;
-
- /* There has to be enough space left in the article for at least the
- header, the colon, whitespace, and one non-whitespace character, hence
- 3, minus 1 since the character pointed to by end is part of the
- article. */
- p = (char *) article;
- while (p != NULL && end - p > headerlen + 2) {
- if (p[0] == '\r' && p[1] == '\n')
- return NULL;
- else if (isheader(p, header, headerlen)) {
- p = skip_fws(p + headerlen + 2, end);
- if (p == NULL)
- return NULL;
- if (p >= end || p[0] != '\r' || p[1] != '\n')
- return p;
- }
- p = wire_nextline(p, end);
- }
- return NULL;
-}
-
-
-/*
-** Given a pointer to a header and a pointer to the last octet of the
-** article, find the end of the header (a pointer to the final \n of the
-** header value). If the header contents don't end in \r\n, return NULL.
-*/
-char *
-wire_endheader(const char *header, const char *end)
-{
- char *p;
-
- p = wire_nextline(header, end);
- while (p != NULL) {
- if (!ISWHITE(*p))
- return p - 1;
- p = wire_nextline(p, end);
- }
- if (end - header >= 1 && *end == '\n' && *(end - 1) == '\r')
- return (char *) end;
- return NULL;
-}
~ian / innduct.git / blobdiff