ossp-pkg/lmtp2nntp/lmtp2nntp_argz.c
/*
** OSSP lmtp2nntp - Mail to News Gateway
** Copyright (c) 2001-2003 Ralf S. Engelschall <rse@engelschall.com>
** Copyright (c) 2001-2003 The OSSP Project <http://www.ossp.org/>
** Copyright (c) 2001-2003 Cable & Wireless Germany <http://www.cw.com/de/>
**
** This file is part of OSSP lmtp2nntp, an LMTP speaking local
** mailer which forwards mails as Usenet news articles via NNTP.
** It can be found at http://www.ossp.org/pkg/tool/lmtp2nntp/.
**
** This program is free software; you can redistribute it and/or
** modify it under the terms of the GNU General Public License
** as published by the Free Software Foundation; either version
** 2.0 of the License, or (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
** General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this file; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
** USA, or contact the OSSP project <ossp@ossp.org>.
**
** argz.h: Zero-Terminated Argument Vector library
*/
/* Routines for dealing with '\0' separated arg vectors.
Copyright (C) 1996, 1997 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1996.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include "lmtp2nntp_argz.h"
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#if defined(HAVE_DMALLOC_H) && defined(WITH_DMALLOC)
#include "dmalloc.h"
#endif
/* Find the length of STRING, but scan at most MAXLEN characters.
If no '\0' terminator is found in that many characters, return MAXLEN. */
static size_t my_strnlen(const char *string, size_t maxlen)
{
const char *end = memchr(string, '\0', maxlen);
return end ? (size_t) (end - string) : maxlen;
}
static char *my_strndup(const char *s, size_t n)
{
size_t len = my_strnlen(s, n);
char *new = malloc(len + 1);
if (new == NULL)
return NULL;
new[len] = '\0';
return (char *)memcpy(new, s, len);
}
/* Copy SRC to DEST, returning the address of the terminating '\0' in DEST. */
static char *my_stpcpy(char *dest, const char *src)
{
register char *d = dest;
register const char *s = src;
do {
*d++ = *s;
} while (*s++ != '\0');
return d - 1;
}
int argz_add_sep(char **argz, size_t * argz_len, const char *string, int delim)
{
size_t nlen = strlen(string) + 1;
if (nlen > 1) {
const char *rp;
char *wp;
*argz = (char *)realloc(*argz, *argz_len + nlen);
if (*argz == NULL)
return ENOMEM;
wp = *argz + *argz_len;
rp = string;
do {
if (*rp == delim) {
if (wp > *argz && wp[-1] != '\0')
*wp++ = '\0';
else
--nlen;
}
else
*wp++ = *rp;
} while (*rp++ != '\0');
*argz_len += nlen;
}
return 0;
}
/* Add BUF, of length BUF_LEN to the argz vector in ARGZ & ARGZ_LEN. */
int argz_append(char **argz, size_t * argz_len, const char *buf, size_t buf_len)
{
size_t new_argz_len = *argz_len + buf_len;
char *new_argz = realloc(*argz, new_argz_len);
if (new_argz) {
memcpy(new_argz + *argz_len, buf, buf_len);
*argz = new_argz;
*argz_len = new_argz_len;
return 0;
}
else
return ENOMEM;
}
/* Add STR to the argz vector in ARGZ & ARGZ_LEN. This should be moved into
* argz.c in libshouldbelibc. */
int argz_add(char **argz, size_t * argz_len, const char *str)
{
return argz_append(argz, argz_len, str, strlen(str) + 1);
}
/* Returns the number of strings in ARGZ. */
size_t argz_count(const char *argz, size_t len)
{
size_t count = 0;
while (len > 0) {
size_t part_len = strlen(argz);
argz += part_len + 1;
len -= part_len + 1;
count++;
}
return count;
}
/* Make a '\0' separated arg vector from a unix argv vector, returning it in
* ARGZ, and the total length in LEN. If a memory allocation error occurs,
* ENOMEM is returned, otherwise 0. */
int argz_create(char *const argv[], char **argz, size_t * len)
{
int argc;
size_t tlen = 0;
char *const *ap;
char *p;
for (argc = 0; argv[argc] != NULL; ++argc)
tlen += strlen(argv[argc]) + 1;
if (tlen == 0)
*argz = NULL;
else {
*argz = malloc(tlen);
if (*argz == NULL)
return ENOMEM;
for (p = *argz, ap = argv; *ap; ++ap, ++p)
p = my_stpcpy(p, *ap);
}
*len = tlen;
return 0;
}
int argz_create_sep(const char *string, int delim, char **argz, size_t * len)
{
size_t nlen = strlen(string) + 1;
if (nlen > 1) {
const char *rp;
char *wp;
*argz = (char *)malloc(nlen);
if (*argz == NULL)
return ENOMEM;
rp = string;
wp = *argz;
do
if (*rp == delim) {
if (wp > *argz && wp[-1] != '\0')
*wp++ = '\0';
else
--nlen;
}
else
*wp++ = *rp;
while (*rp++ != '\0');
if (nlen == 0) {
free(*argz);
*argz = NULL;
*len = 0;
}
*len = nlen;
}
else {
*argz = NULL;
*len = 0;
}
return 0;
}
/* Delete ENTRY from ARGZ & ARGZ_LEN, if any. */
void argz_delete(char **argz, size_t * argz_len, char *entry)
{
if (entry)
/* Get rid of the old value for NAME. */
{
size_t entry_len = strlen(entry) + 1;
*argz_len -= entry_len;
memmove(entry, entry + entry_len, *argz_len - (entry - *argz));
if (*argz_len == 0) {
free(*argz);
*argz = 0;
}
}
}
/* Puts pointers to each string in ARGZ, plus a terminating 0 element, into
* ARGV, which must be large enough to hold them all. */
void argz_extract(const char *argz, size_t len, char **argv)
{
while (len > 0) {
size_t part_len = strlen(argz);
*argv++ = (char *)argz;
argz += part_len + 1;
len -= part_len + 1;
}
*argv = 0;
}
/* Insert ENTRY into ARGZ & ARGZ_LEN before BEFORE, which should be an
* existing entry in ARGZ; if BEFORE is NULL, ENTRY is appended to the end.
* Since ARGZ's first entry is the same as ARGZ, argz_insert (ARGZ, ARGZ_LEN,
* ARGZ, ENTRY) will insert ENTRY at the beginning of ARGZ. If BEFORE is not
* in ARGZ, EINVAL is returned, else if memory can't be allocated for the new
* ARGZ, ENOMEM is returned, else 0. */
int argz_insert(char **argz, size_t * argz_len, char *before, const char *entry)
{
if (!before)
return argz_add(argz, argz_len, entry);
if (before < *argz || before >= *argz + *argz_len)
return EINVAL;
if (before > *argz)
/* Make sure before is actually the beginning of an entry. */
while (before[-1])
before--;
{
size_t after_before = *argz_len - (before - *argz);
size_t entry_len = strlen(entry) + 1;
size_t new_argz_len = *argz_len + entry_len;
char *new_argz = realloc(*argz, new_argz_len);
if (new_argz) {
before = new_argz + (before - *argz);
memmove(before + entry_len, before, after_before);
memmove(before, entry, entry_len);
*argz = new_argz;
*argz_len = new_argz_len;
return 0;
}
else
return ENOMEM;
}
}
char *argz_next(const char *argz, size_t argz_len, const char *entry)
{
if (entry) {
if (entry < argz + argz_len)
entry = strchr(entry, '\0') + 1;
return entry >= argz + argz_len ? NULL : (char *)entry;
}
else if (argz_len > 0)
return (char *)argz;
else
return NULL;
}
/* Append BUF, of length BUF_LEN to *TO, of length *TO_LEN, reallocating and
* updating *TO & *TO_LEN appropriately. If an allocation error occurs,
* *TO's old value is freed, and *TO is set to 0. */
static void
str_append(char **to, size_t * to_len, const char *buf, const size_t buf_len)
{
size_t new_len = *to_len + buf_len;
char *new_to = realloc(*to, new_len + 1);
if (new_to) {
/* *((char *)__mempcpy(new_to + *to_len, buf, buf_len)) = '\0'; */
memcpy(new_to + *to_len, buf, buf_len);
*(new_to + *to_len + buf_len) = '\0';
*to = new_to;
*to_len = new_len;
}
else {
free(*to);
*to = 0;
}
}
/* Replace any occurrences of the string STR in ARGZ with WITH, reallocating
* ARGZ as necessary. If REPLACE_COUNT is non-zero, *REPLACE_COUNT will be
* incremented by number of replacements performed. */
int argz_replace(char **argz, size_t * argz_len, const char *str,
const char *with, unsigned *replace_count)
{
int err = 0;
if (str && *str) {
char *arg = 0;
char *src = *argz;
size_t src_len = *argz_len;
char *dst = 0;
size_t dst_len = 0;
int delayed_copy = 1; /* True while we've avoided copying
* anything. */
size_t str_len = strlen(str), with_len = strlen(with);
while (!err && (arg = argz_next(src, src_len, arg))) {
char *match = strstr(arg, str);
if (match) {
char *from = match + str_len;
size_t to_len = match - arg;
char *to = my_strndup(arg, to_len);
while (to && from) {
str_append(&to, &to_len, with, with_len);
if (to) {
match = strstr(from, str);
if (match) {
str_append(&to, &to_len, from, match - from);
from = match + str_len;
}
else {
str_append(&to, &to_len, from, strlen(from));
from = 0;
}
}
}
if (to) {
if (delayed_copy)
/* We avoided copying SRC to DST until we found a
* match; now that we've done so, copy everything
* from the start of SRC. */
{
if (arg > src)
err =
argz_append(&dst, &dst_len, src,
(arg - src));
delayed_copy = 0;
}
if (!err)
err = argz_add(&dst, &dst_len, to);
free(to);
}
else
err = ENOMEM;
if (replace_count)
(*replace_count)++;
}
else if (!delayed_copy)
err = argz_add(&dst, &dst_len, arg);
}
if (!err) {
if (!delayed_copy)
/* We never found any instances of str. */
{
if (src)
free(src);
*argz = dst;
*argz_len = dst_len;
}
}
else if (dst_len > 0)
free(dst);
}
return err;
}
/* Make '\0' separated arg vector ARGZ printable by converting all the '\0's
* except the last into the character SEP. */
void argz_stringify(char *argz, size_t len, int sep)
{
if (len > 0) {
while (1) {
size_t part_len = my_strnlen(argz, len);
argz += part_len;
len -= part_len;
if (len-- <= 1) /* includes final '\0' we want to stop
* at */
break;
*argz++ = sep;
}
}
return;
}
