forked from osmocom/wireshark
fe8e42b58e
svn path=/trunk/; revision=2768
291 lines
6.5 KiB
C
291 lines
6.5 KiB
C
/* strutil.c
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* String utility routines
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*
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* $Id: strutil.c,v 1.7 2000/12/22 12:05:36 gram Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@zing.org>
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* Copyright 1998 Gerald Combs
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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 this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <glib.h>
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#include "strutil.h"
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/*
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* Given a pointer into a data buffer, and to the end of the buffer,
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* find the end of the (putative) line at that position in the data
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* buffer.
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* Return a pointer to the EOL character(s) in "*eol".
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*/
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const u_char *
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find_line_end(const u_char *data, const u_char *dataend, const u_char **eol)
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{
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const u_char *lineend;
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lineend = memchr(data, '\n', dataend - data);
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if (lineend == NULL) {
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/*
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* No LF - line is probably continued in next TCP segment.
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*/
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lineend = dataend;
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*eol = dataend;
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} else {
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/*
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* Is the LF at the beginning of the line?
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*/
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if (lineend > data) {
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/*
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* No - is it preceded by a carriage return?
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* (Perhaps it's supposed to be, but that's not guaranteed....)
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*/
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if (*(lineend - 1) == '\r') {
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/*
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* Yes. The EOL starts with the CR.
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*/
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*eol = lineend - 1;
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} else {
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/*
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* No. The EOL starts with the LF.
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*/
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*eol = lineend;
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/*
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* I seem to remember that we once saw lines ending with LF-CR
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* in an HTTP request or response, so check if it's *followed*
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* by a carriage return.
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*/
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if (lineend < (dataend - 1) && *(lineend + 1) == '\r') {
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/*
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* It's <non-LF><LF><CR>; say it ends with the CR.
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*/
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lineend++;
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}
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}
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} else {
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/*
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* Yes - the EOL starts with the LF.
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*/
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*eol = lineend;
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}
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/*
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* Point to the character after the last character.
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*/
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lineend++;
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}
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return lineend;
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}
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/*
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* Get the length of the next token in a line, and the beginning of the
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* next token after that (if any).
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* Return 0 if there is no next token.
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*/
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int
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get_token_len(const u_char *linep, const u_char *lineend,
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const u_char **next_token)
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{
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const u_char *tokenp;
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int token_len;
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tokenp = linep;
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/*
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* Search for a blank, a CR or an LF, or the end of the buffer.
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*/
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while (linep < lineend && *linep != ' ' && *linep != '\r' && *linep != '\n')
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linep++;
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token_len = linep - tokenp;
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/*
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* Skip trailing blanks.
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*/
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while (linep < lineend && *linep == ' ')
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linep++;
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*next_token = linep;
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return token_len;
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}
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#define INITIAL_FMTBUF_SIZE 128
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/*
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* Given a string, generate a string from it that shows non-printable
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* characters as C-style escapes, and return a pointer to it.
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*/
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gchar *
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format_text(const u_char *string, int len)
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{
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static gchar *fmtbuf;
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static int fmtbuf_len;
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int column;
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const u_char *stringend = string + len;
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u_char c;
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int i;
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/*
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* Allocate the buffer if it's not already allocated.
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*/
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if (fmtbuf == NULL) {
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fmtbuf = g_malloc(INITIAL_FMTBUF_SIZE);
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fmtbuf_len = INITIAL_FMTBUF_SIZE;
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}
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column = 0;
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while (string < stringend) {
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/*
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* Is there enough room for this character, if it expands to
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* a backslash plus 3 octal digits (which is the most it can
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* expand to), and also enough room for a terminating '\0'?
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*/
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if (column+3+1 >= fmtbuf_len) {
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/*
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* Double the buffer's size if it's not big enough.
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* The size of the buffer starts at 128, so doubling its size
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* adds at least another 128 bytes, which is more than enough
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* for one more character plus a terminating '\0'.
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*/
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fmtbuf_len = fmtbuf_len * 2;
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fmtbuf = g_realloc(fmtbuf, fmtbuf_len);
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}
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c = *string++;
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if (isprint(c)) {
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fmtbuf[column] = c;
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column++;
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} else {
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fmtbuf[column] = '\\';
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column++;
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switch (c) {
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case '\\':
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fmtbuf[column] = '\\';
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column++;
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break;
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case '\a':
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fmtbuf[column] = 'a';
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column++;
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break;
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case '\b':
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fmtbuf[column] = 'b';
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column++;
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break;
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case '\f':
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fmtbuf[column] = 'f';
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column++;
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break;
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case '\n':
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fmtbuf[column] = 'n';
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column++;
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break;
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case '\r':
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fmtbuf[column] = 'r';
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column++;
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break;
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case '\t':
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fmtbuf[column] = 't';
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column++;
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break;
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case '\v':
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fmtbuf[column] = 'v';
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column++;
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break;
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default:
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i = (c>>6)&03;
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fmtbuf[column] = i + '0';
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column++;
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i = (c>>3)&07;
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fmtbuf[column] = i + '0';
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column++;
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i = (c>>0)&07;
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fmtbuf[column] = i + '0';
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column++;
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break;
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}
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}
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}
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fmtbuf[column] = '\0';
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return fmtbuf;
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}
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/* Max string length for displaying byte string. */
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#define MAX_BYTE_STR_LEN 32
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/* Turn an array of bytes into a string showing the bytes in hex. */
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#define N_BYTES_TO_STR_STRINGS 6
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gchar *
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bytes_to_str(const guint8 *bd, int bd_len) {
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return bytes_to_str_punct(bd,bd_len,'\0');
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}
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/* Turn an array of bytes into a string showing the bytes in hex with
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* punct as a bytes separator.
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*/
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gchar *
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bytes_to_str_punct(const guint8 *bd, int bd_len, gchar punct) {
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static gchar str[N_BYTES_TO_STR_STRINGS][MAX_BYTE_STR_LEN+3+1];
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static int cur_idx;
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gchar *cur;
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gchar *p;
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int len;
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static const char hex[16] = { '0', '1', '2', '3', '4', '5', '6', '7',
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'8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
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cur_idx++;
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if (cur_idx >= N_BYTES_TO_STR_STRINGS)
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cur_idx = 0;
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cur = &str[cur_idx][0];
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p = cur;
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len = MAX_BYTE_STR_LEN;
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while (bd_len > 0 && len > 0) {
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*p++ = hex[(*bd) >> 4];
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*p++ = hex[(*bd) & 0xF];
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len -= 2;
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bd++;
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bd_len--;
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if(punct && bd_len > 0){
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*p++ = punct;
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len--;
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}
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}
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if (bd_len != 0) {
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/* Note that we're not showing the full string. */
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*p++ = '.';
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*p++ = '.';
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*p++ = '.';
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}
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*p = '\0';
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return cur;
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}
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