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/* string-util.c - Extra or enhanced routines for null terminated strings.
*
* Copyright (c) 2012 Jani Nikula
*
* 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 3 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 program. If not, see http://www.gnu.org/licenses/ .
*
* Author: Jani Nikula <jani@nikula.org>
*/
#include "string-util.h"
#include "talloc.h"
#include <ctype.h>
#include <errno.h>
char *
strtok_len (char *s, const char *delim, size_t *len)
{
/* skip initial delims */
s += strspn (s, delim);
/* length of token */
*len = strcspn (s, delim);
return *len ? s : NULL;
}
const char *
strtok_len_c (const char *s, const char *delim, size_t *len)
{
/* strtok_len is already const-safe, but we can't express both
* versions in the C type system. */
return strtok_len ((char*)s, delim, len);
}
char *
sanitize_string (const void *ctx, const char *str)
{
char *out, *loop;
if (! str)
return NULL;
out = talloc_strdup (ctx, str);
if (! out)
return NULL;
for (loop = out; *loop; loop++) {
if (*loop == '\t' || *loop == '\n')
*loop = ' ';
else if ((unsigned char)(*loop) < 32)
*loop = '?';
}
return out;
}
static int
is_unquoted_terminator (unsigned char c)
{
return c == 0 || c <= ' ' || c == ')';
}
int
make_boolean_term (void *ctx, const char *prefix, const char *term,
char **buf, size_t *len)
{
const char *in;
char *out;
size_t needed = 3;
int need_quoting = 0;
/* Do we need quoting? To be paranoid, we quote anything
* containing a quote or '(', even though these only matter at the
* beginning, and anything containing non-ASCII text. */
if (! term[0])
need_quoting = 1;
for (in = term; *in && !need_quoting; in++)
if (is_unquoted_terminator (*in) || *in == '"' || *in == '('
|| (unsigned char)*in > 127)
need_quoting = 1;
if (need_quoting)
for (in = term; *in; in++)
needed += (*in == '"') ? 2 : 1;
else
needed = strlen (term) + 1;
/* Reserve space for the prefix */
if (prefix)
needed += strlen (prefix) + 1;
if ((*buf == NULL) || (needed > *len)) {
*len = 2 * needed;
*buf = talloc_realloc (ctx, *buf, char, *len);
}
if (! *buf) {
errno = ENOMEM;
return -1;
}
out = *buf;
/* Copy in the prefix */
if (prefix) {
strcpy (out, prefix);
out += strlen (prefix);
*out++ = ':';
}
if (! need_quoting) {
strcpy (out, term);
return 0;
}
/* Quote term by enclosing it in double quotes and doubling any
* internal double quotes. */
*out++ = '"';
in = term;
while (*in) {
if (*in == '"')
*out++ = '"';
*out++ = *in++;
}
*out++ = '"';
*out = '\0';
return 0;
}
static const char*
skip_space (const char *str)
{
while (*str && isspace ((unsigned char) *str))
++str;
return str;
}
int
parse_boolean_term (void *ctx, const char *str,
char **prefix_out, char **term_out)
{
int err = EINVAL;
*prefix_out = *term_out = NULL;
/* Parse prefix */
str = skip_space (str);
const char *pos = strchr (str, ':');
if (! pos || pos == str)
goto FAIL;
*prefix_out = talloc_strndup (ctx, str, pos - str);
if (! *prefix_out) {
err = ENOMEM;
goto FAIL;
}
++pos;
/* Implement de-quoting compatible with make_boolean_term. */
if (*pos == '"') {
char *out = talloc_array (ctx, char, strlen (pos));
int closed = 0;
if (! out) {
err = ENOMEM;
goto FAIL;
}
*term_out = out;
/* Skip the opening quote, find the closing quote, and
* un-double doubled internal quotes. */
for (++pos; *pos; ) {
if (*pos == '"') {
++pos;
if (*pos != '"') {
/* Found the closing quote. */
closed = 1;
pos = skip_space (pos);
break;
}
}
*out++ = *pos++;
}
/* Did the term terminate without a closing quote or is there
* trailing text after the closing quote? */
if (!closed || *pos)
goto FAIL;
*out = '\0';
} else {
const char *start = pos;
/* Check for text after the boolean term. */
while (! is_unquoted_terminator (*pos))
++pos;
if (*skip_space (pos)) {
err = EINVAL;
goto FAIL;
}
/* No trailing text; dup the string so the caller can free
* it. */
*term_out = talloc_strndup (ctx, start, pos - start);
if (! *term_out) {
err = ENOMEM;
goto FAIL;
}
}
return 0;
FAIL:
talloc_free (*prefix_out);
talloc_free (*term_out);
errno = err;
return -1;
}
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