guacamole-spice-protocol/src/libguac/string.c

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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
#include "config.h"
#include <stddef.h>
#include <string.h>
size_t guac_strlcpy(char* restrict dest, const char* restrict src, size_t n) {
#ifdef HAVE_STRLCPY
return strlcpy(dest, src, n);
#else
/* Calculate actual length of desired string */
size_t length = strlen(src);
/* Copy nothing if there is no space */
if (n <= 0)
return length;
/* Calculate length of the string which will be copied */
size_t copy_length = length;
if (copy_length >= n)
copy_length = n - 1;
/* Copy only as much of string as possible, manually adding a null
* terminator */
memcpy(dest, src, copy_length);
dest[copy_length] = '\0';
/* Return the overall length of the desired string */
return length;
#endif
}
size_t guac_strlcat(char* restrict dest, const char* restrict src, size_t n) {
#ifdef HAVE_STRLCPY
return strlcat(dest, src, n);
#else
int length = strnlen(dest, n);
return length + guac_strlcpy(dest + length, src, n - length);
#endif
}
size_t guac_strljoin(char* restrict dest, const char* restrict const* elements,
int nmemb, const char* restrict delim, size_t n) {
int length = 0;
const char* restrict const* current = elements;
/* If no elements are provided, nothing to do but ensure the destination
* buffer is null terminated */
if (nmemb <= 0)
return guac_strlcpy(dest, "", n);
/* Initialize destination buffer with first element */
length += guac_strlcpy(dest, *current, n);
/* Copy all remaining elements, separated by delimiter */
for (current++; nmemb > 1; current++, nmemb--) {
length += guac_strlcat(dest + length, delim, n - length);
length += guac_strlcat(dest + length, *current, n - length);
}
return length;
}