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/*
*
* Copyright 2015 gRPC authors.
*
* Licensed 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 "src/core/lib/slice/slice_string_helpers.h"
#include <string.h>
#include <grpc/support/log.h>
#include "src/core/lib/slice/slice_internal.h"
#include "src/core/lib/support/string.h"
char *grpc_dump_slice(grpc_slice s, uint32_t flags) {
return gpr_dump((const char *)GRPC_SLICE_START_PTR(s), GRPC_SLICE_LENGTH(s),
flags);
}
/** Finds the initial (\a begin) and final (\a end) offsets of the next
* substring from \a str + \a read_offset until the next \a sep or the end of \a
* str.
*
* Returns 1 and updates \a begin and \a end. Returns 0 otherwise. */
static int slice_find_separator_offset(const grpc_slice str, const char *sep,
const size_t read_offset, size_t *begin,
size_t *end) {
size_t i;
const uint8_t *str_ptr = GRPC_SLICE_START_PTR(str) + read_offset;
const size_t str_len = GRPC_SLICE_LENGTH(str) - read_offset;
const size_t sep_len = strlen(sep);
if (str_len < sep_len) {
return 0;
}
for (i = 0; i <= str_len - sep_len; i++) {
if (memcmp(str_ptr + i, sep, sep_len) == 0) {
*begin = read_offset;
*end = read_offset + i;
return 1;
}
}
return 0;
}
static void skip_leading_trailing_spaces(const uint8_t *str_buffer,
size_t *begin, size_t *end) {
while (*begin < *end && str_buffer[*begin] == ' ') {
(*begin)++;
}
while (*begin < *end && str_buffer[*end - 1] == ' ') {
(*end)--;
}
}
static void grpc_slice_split_inner(grpc_slice str, const char *sep,
grpc_slice_buffer *dst, bool no_space) {
const size_t sep_len = strlen(sep);
size_t begin, end;
const uint8_t *str_buffer = GRPC_SLICE_START_PTR(str);
size_t sep_pos;
GPR_ASSERT(sep_len > 0);
if (slice_find_separator_offset(str, sep, 0, &begin, &end) != 0) {
do {
sep_pos = end;
if (no_space) {
skip_leading_trailing_spaces(str_buffer, &begin, &end);
}
grpc_slice_buffer_add_indexed(dst, grpc_slice_sub(str, begin, end));
} while (slice_find_separator_offset(str, sep, sep_pos + sep_len, &begin,
&end) != 0);
begin = sep_pos + sep_len;
end = GRPC_SLICE_LENGTH(str);
if (no_space) {
skip_leading_trailing_spaces(str_buffer, &begin, &end);
}
grpc_slice_buffer_add_indexed(dst, grpc_slice_sub(str, begin, end));
} else { /* no sep found, add whole input */
begin = 0;
end = GRPC_SLICE_LENGTH(str);
if (no_space) {
skip_leading_trailing_spaces(str_buffer, &begin, &end);
}
grpc_slice_buffer_add_indexed(dst, grpc_slice_sub(str, begin, end));
}
}
void grpc_slice_split(grpc_slice str, const char *sep, grpc_slice_buffer *dst) {
grpc_slice_split_inner(str, sep, dst, false);
}
void grpc_slice_split_without_space(grpc_slice str, const char *sep,
grpc_slice_buffer *dst) {
grpc_slice_split_inner(str, sep, dst, true);
}
bool grpc_parse_slice_to_uint32(grpc_slice str, uint32_t *result) {
return gpr_parse_bytes_to_uint32((const char *)GRPC_SLICE_START_PTR(str),
GRPC_SLICE_LENGTH(str), result) != 0;
}
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