Security: CVE-2015-7973, CVE-2015-7974, CVE-2015-7975 Security: CVE-2015-7976, CVE-2015-7977, CVE-2015-7978 Security: CVE-2015-7979, CVE-2015-8138, CVE-2015-8139 Security: CVE-2015-8140, CVE-2015-8158 With hat: so
340 lines
9.0 KiB
C
340 lines
9.0 KiB
C
/** \file tokenize.c
|
|
*
|
|
* Tokenize a string, accommodating quoted strings.
|
|
*
|
|
* @addtogroup autoopts
|
|
* @{
|
|
*/
|
|
/*
|
|
* This file defines the string_tokenize interface
|
|
* This file is part of AutoOpts, a companion to AutoGen.
|
|
* AutoOpts is free software.
|
|
* AutoOpts is Copyright (C) 1992-2015 by Bruce Korb - all rights reserved
|
|
*
|
|
* AutoOpts is available under any one of two licenses. The license
|
|
* in use must be one of these two and the choice is under the control
|
|
* of the user of the license.
|
|
*
|
|
* The GNU Lesser General Public License, version 3 or later
|
|
* See the files "COPYING.lgplv3" and "COPYING.gplv3"
|
|
*
|
|
* The Modified Berkeley Software Distribution License
|
|
* See the file "COPYING.mbsd"
|
|
*
|
|
* These files have the following sha256 sums:
|
|
*
|
|
* 8584710e9b04216a394078dc156b781d0b47e1729104d666658aecef8ee32e95 COPYING.gplv3
|
|
* 4379e7444a0e2ce2b12dd6f5a52a27a4d02d39d247901d3285c88cf0d37f477b COPYING.lgplv3
|
|
* 13aa749a5b0a454917a944ed8fffc530b784f5ead522b1aacaf4ec8aa55a6239 COPYING.mbsd
|
|
*/
|
|
|
|
#include <errno.h>
|
|
#include <stdlib.h>
|
|
|
|
#define cc_t const unsigned char
|
|
#define ch_t unsigned char
|
|
|
|
/* = = = START-STATIC-FORWARD = = = */
|
|
static void
|
|
copy_cooked(ch_t ** ppDest, char const ** ppSrc);
|
|
|
|
static void
|
|
copy_raw(ch_t ** ppDest, char const ** ppSrc);
|
|
|
|
static token_list_t *
|
|
alloc_token_list(char const * str);
|
|
/* = = = END-STATIC-FORWARD = = = */
|
|
|
|
static void
|
|
copy_cooked(ch_t ** ppDest, char const ** ppSrc)
|
|
{
|
|
ch_t * pDest = (ch_t *)*ppDest;
|
|
const ch_t * pSrc = (const ch_t *)(*ppSrc + 1);
|
|
|
|
for (;;) {
|
|
ch_t ch = *(pSrc++);
|
|
switch (ch) {
|
|
case NUL: *ppSrc = NULL; return;
|
|
case '"': goto done;
|
|
case '\\':
|
|
pSrc += ao_string_cook_escape_char((const char *)pSrc, (char *)&ch, 0x7F);
|
|
if (ch == 0x7F)
|
|
break;
|
|
/* FALLTHROUGH */
|
|
|
|
default:
|
|
*(pDest++) = ch;
|
|
}
|
|
}
|
|
|
|
done:
|
|
*ppDest = (ch_t *)pDest; /* next spot for storing character */
|
|
*ppSrc = (char const *)pSrc; /* char following closing quote */
|
|
}
|
|
|
|
|
|
static void
|
|
copy_raw(ch_t ** ppDest, char const ** ppSrc)
|
|
{
|
|
ch_t * pDest = *ppDest;
|
|
cc_t * pSrc = (cc_t *) (*ppSrc + 1);
|
|
|
|
for (;;) {
|
|
ch_t ch = *(pSrc++);
|
|
switch (ch) {
|
|
case NUL: *ppSrc = NULL; return;
|
|
case '\'': goto done;
|
|
case '\\':
|
|
/*
|
|
* *Four* escapes are handled: newline removal, escape char
|
|
* quoting and apostrophe quoting
|
|
*/
|
|
switch (*pSrc) {
|
|
case NUL: *ppSrc = NULL; return;
|
|
case '\r':
|
|
if (*(++pSrc) == NL)
|
|
++pSrc;
|
|
continue;
|
|
|
|
case NL:
|
|
++pSrc;
|
|
continue;
|
|
|
|
case '\'':
|
|
ch = '\'';
|
|
/* FALLTHROUGH */
|
|
|
|
case '\\':
|
|
++pSrc;
|
|
break;
|
|
}
|
|
/* FALLTHROUGH */
|
|
|
|
default:
|
|
*(pDest++) = ch;
|
|
}
|
|
}
|
|
|
|
done:
|
|
*ppDest = pDest; /* next spot for storing character */
|
|
*ppSrc = (char const *) pSrc; /* char following closing quote */
|
|
}
|
|
|
|
static token_list_t *
|
|
alloc_token_list(char const * str)
|
|
{
|
|
token_list_t * res;
|
|
|
|
int max_token_ct = 2; /* allow for trailing NULL pointer & NUL on string */
|
|
|
|
if (str == NULL) goto enoent_res;
|
|
|
|
/*
|
|
* Trim leading white space. Use "ENOENT" and a NULL return to indicate
|
|
* an empty string was passed.
|
|
*/
|
|
str = SPN_WHITESPACE_CHARS(str);
|
|
if (*str == NUL) goto enoent_res;
|
|
|
|
/*
|
|
* Take an approximate count of tokens. If no quoted strings are used,
|
|
* it will be accurate. If quoted strings are used, it will be a little
|
|
* high and we'll squander the space for a few extra pointers.
|
|
*/
|
|
{
|
|
char const * pz = str;
|
|
|
|
do {
|
|
max_token_ct++;
|
|
pz = BRK_WHITESPACE_CHARS(pz+1);
|
|
pz = SPN_WHITESPACE_CHARS(pz);
|
|
} while (*pz != NUL);
|
|
|
|
res = malloc(sizeof(*res) + (size_t)(pz - str)
|
|
+ ((size_t)max_token_ct * sizeof(ch_t *)));
|
|
}
|
|
|
|
if (res == NULL)
|
|
errno = ENOMEM;
|
|
else res->tkn_list[0] = (ch_t *)(res->tkn_list + (max_token_ct - 1));
|
|
|
|
return res;
|
|
|
|
enoent_res:
|
|
|
|
errno = ENOENT;
|
|
return NULL;
|
|
}
|
|
|
|
/*=export_func ao_string_tokenize
|
|
*
|
|
* what: tokenize an input string
|
|
*
|
|
* arg: + char const * + string + string to be tokenized +
|
|
*
|
|
* ret_type: token_list_t *
|
|
* ret_desc: pointer to a structure that lists each token
|
|
*
|
|
* doc:
|
|
*
|
|
* This function will convert one input string into a list of strings.
|
|
* The list of strings is derived by separating the input based on
|
|
* white space separation. However, if the input contains either single
|
|
* or double quote characters, then the text after that character up to
|
|
* a matching quote will become the string in the list.
|
|
*
|
|
* The returned pointer should be deallocated with @code{free(3C)} when
|
|
* are done using the data. The data are placed in a single block of
|
|
* allocated memory. Do not deallocate individual token/strings.
|
|
*
|
|
* The structure pointed to will contain at least these two fields:
|
|
* @table @samp
|
|
* @item tkn_ct
|
|
* The number of tokens found in the input string.
|
|
* @item tok_list
|
|
* An array of @code{tkn_ct + 1} pointers to substring tokens, with
|
|
* the last pointer set to NULL.
|
|
* @end table
|
|
*
|
|
* There are two types of quoted strings: single quoted (@code{'}) and
|
|
* double quoted (@code{"}). Singly quoted strings are fairly raw in that
|
|
* escape characters (@code{\\}) are simply another character, except when
|
|
* preceding the following characters:
|
|
* @example
|
|
* @code{\\} double backslashes reduce to one
|
|
* @code{'} incorporates the single quote into the string
|
|
* @code{\n} suppresses both the backslash and newline character
|
|
* @end example
|
|
*
|
|
* Double quote strings are formed according to the rules of string
|
|
* constants in ANSI-C programs.
|
|
*
|
|
* example:
|
|
* @example
|
|
* #include <stdlib.h>
|
|
* int ix;
|
|
* token_list_t * ptl = ao_string_tokenize(some_string)
|
|
* for (ix = 0; ix < ptl->tkn_ct; ix++)
|
|
* do_something_with_tkn(ptl->tkn_list[ix]);
|
|
* free(ptl);
|
|
* @end example
|
|
* Note that everything is freed with the one call to @code{free(3C)}.
|
|
*
|
|
* err:
|
|
* NULL is returned and @code{errno} will be set to indicate the problem:
|
|
* @itemize @bullet
|
|
* @item
|
|
* @code{EINVAL} - There was an unterminated quoted string.
|
|
* @item
|
|
* @code{ENOENT} - The input string was empty.
|
|
* @item
|
|
* @code{ENOMEM} - There is not enough memory.
|
|
* @end itemize
|
|
=*/
|
|
token_list_t *
|
|
ao_string_tokenize(char const * str)
|
|
{
|
|
token_list_t * res = alloc_token_list(str);
|
|
ch_t * pzDest;
|
|
|
|
/*
|
|
* Now copy each token into the output buffer.
|
|
*/
|
|
if (res == NULL)
|
|
return res;
|
|
|
|
pzDest = (ch_t *)(res->tkn_list[0]);
|
|
res->tkn_ct = 0;
|
|
|
|
do {
|
|
res->tkn_list[ res->tkn_ct++ ] = pzDest;
|
|
for (;;) {
|
|
int ch = (ch_t)*str;
|
|
if (IS_WHITESPACE_CHAR(ch)) {
|
|
found_white_space:
|
|
str = SPN_WHITESPACE_CHARS(str+1);
|
|
break;
|
|
}
|
|
|
|
switch (ch) {
|
|
case '"':
|
|
copy_cooked(&pzDest, &str);
|
|
if (str == NULL) {
|
|
free(res);
|
|
errno = EINVAL;
|
|
return NULL;
|
|
}
|
|
if (IS_WHITESPACE_CHAR(*str))
|
|
goto found_white_space;
|
|
break;
|
|
|
|
case '\'':
|
|
copy_raw(&pzDest, &str);
|
|
if (str == NULL) {
|
|
free(res);
|
|
errno = EINVAL;
|
|
return NULL;
|
|
}
|
|
if (IS_WHITESPACE_CHAR(*str))
|
|
goto found_white_space;
|
|
break;
|
|
|
|
case NUL:
|
|
goto copy_done;
|
|
|
|
default:
|
|
str++;
|
|
*(pzDest++) = (unsigned char)ch;
|
|
}
|
|
} copy_done:;
|
|
|
|
/*
|
|
* NUL terminate the last token and see if we have any more tokens.
|
|
*/
|
|
*(pzDest++) = NUL;
|
|
} while (*str != NUL);
|
|
|
|
res->tkn_list[ res->tkn_ct ] = NULL;
|
|
|
|
return res;
|
|
}
|
|
|
|
#ifdef TEST
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
int
|
|
main(int argc, char ** argv)
|
|
{
|
|
if (argc == 1) {
|
|
printf("USAGE: %s arg [ ... ]\n", *argv);
|
|
return 1;
|
|
}
|
|
while (--argc > 0) {
|
|
char * arg = *(++argv);
|
|
token_list_t * p = ao_string_tokenize(arg);
|
|
if (p == NULL) {
|
|
printf("Parsing string ``%s'' failed:\n\terrno %d (%s)\n",
|
|
arg, errno, strerror(errno));
|
|
} else {
|
|
int ix = 0;
|
|
printf("Parsed string ``%s''\ninto %d tokens:\n", arg, p->tkn_ct);
|
|
do {
|
|
printf(" %3d: ``%s''\n", ix+1, p->tkn_list[ix]);
|
|
} while (++ix < p->tkn_ct);
|
|
free(p);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/** @}
|
|
*
|
|
* Local Variables:
|
|
* mode: C
|
|
* c-file-style: "stroustrup"
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
* end of autoopts/tokenize.c */
|