esp-idf/components/esp_http_client/lib/http_utils.c

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// Copyright 2015-2018 Espressif Systems (Shanghai) PTE LTD
//
// 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 <string.h>
#include <ctype.h>
#include <stdlib.h>
#include <stdio.h>
#include <assert.h>
#include "http_utils.h"
#ifndef mem_check
#define mem_check(x) assert(x)
#endif
char *http_utils_join_string(const char *first_str, int len_first, const char *second_str, int len_second)
{
int first_str_len = len_first > 0 ? len_first : strlen(first_str);
int second_str_len = len_second > 0 ? len_second : strlen(second_str);
char *ret = NULL;
if (first_str_len + second_str_len > 0) {
ret = calloc(1, first_str_len + second_str_len + 1);
mem_check(ret);
memcpy(ret, first_str, first_str_len);
memcpy(ret + first_str_len, second_str, second_str_len);
}
return ret;
}
char *http_utils_assign_string(char **str, const char *new_str, int len)
{
int l = len;
if (new_str == NULL) {
return NULL;
}
char *old_str = *str;
if (l <= 0) {
l = strlen(new_str);
}
if (old_str) {
old_str = realloc(old_str, l + 1);
mem_check(old_str);
old_str[l] = 0;
} else {
old_str = calloc(1, l + 1);
mem_check(old_str);
}
memcpy(old_str, new_str, l);
*str = old_str;
return old_str;
}
char *http_utils_append_string(char **str, const char *new_str, int len)
{
if (new_str == NULL) {
return NULL;
}
char *old_str = *str;
if (len <= 0) {
len = strlen(new_str);
}
if (old_str) {
int old_len = strlen(old_str);
old_str = realloc(old_str, old_len + len + 1);
mem_check(old_str);
memcpy(old_str + old_len, new_str, len);
old_str[old_len + len] = 0;
} else {
old_str = calloc(1, len + 1);
mem_check(old_str);
memcpy(old_str, new_str, len);
}
*str = old_str;
return old_str;
}
void http_utils_trim_whitespace(char **str)
{
char *end, *start;
if (str == NULL) {
return;
}
start = *str;
if (start == NULL) {
return;
}
// Trim leading space
while (isspace((unsigned char)*start)) start ++;
if (*start == 0) { // All spaces?
**str = 0;
return;
}
// Trim trailing space
end = (char *)(start + strlen(start) - 1);
while (end > start && isspace((unsigned char)*end)) {
end--;
}
// Write new null terminator
*(end + 1) = 0;
memmove(*str, start, strlen(start) + 1);
}
char *http_utils_get_string_between(const char *str, const char *begin, const char *end)
{
char *found = strstr(str, begin);
char *ret = NULL;
if (found) {
found += strlen(begin);
char *found_end = strstr(found, end);
if (found_end) {
ret = calloc(1, found_end - found + 1);
mem_check(ret);
memcpy(ret, found, found_end - found);
return ret;
}
}
return NULL;
}
int http_utils_str_starts_with(const char *str, const char *start)
{
int i;
int match_str_len = strlen(str);
int start_len = strlen(start);
if (start_len > match_str_len) {
return -1;
}
for (i = 0; i < start_len; i++) {
if (str[i] != start[i]) {
return 1;
}
}
return 0;
}