104 lines
3.5 KiB
C
104 lines
3.5 KiB
C
/*
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* Copyright (C) 2013 Glyptodon LLC
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "config.h"
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#include <errno.h>
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#include <iconv.h>
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#include <stdlib.h>
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#include <string.h>
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char* convert(const char* from_charset, const char* to_charset, const char* input) {
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size_t input_remaining;
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size_t output_remaining;
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size_t bytes_converted = 0;
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char* output;
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char* output_buffer;
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char* new_buffer;
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char* input_buffer;
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size_t output_length;
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iconv_t cd;
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cd = iconv_open(to_charset, from_charset);
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if(cd == (iconv_t) -1)
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/* Cannot convert due to invalid character set */
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return NULL;
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input_remaining = strlen(input);
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input_buffer = (char*) input;
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/* Start the output buffer the same size as the input buffer */
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output_length = input_remaining;
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/* Leave some space at the end for NULL terminator */
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if (!(output = (char*) malloc(output_length + 4))) {
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/* Cannot convert due to memory allocation error */
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iconv_close(cd);
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return NULL;
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}
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do {
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output_buffer = output + bytes_converted;
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output_remaining = output_length - bytes_converted;
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bytes_converted = iconv(cd, &input_buffer,
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&input_remaining, &output_buffer, &output_remaining);
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if(bytes_converted == -1) {
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if(errno == E2BIG) {
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/* The output buffer is too small, so allocate more space */
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bytes_converted = output_buffer - output;
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output_length += input_remaining * 2 + 8;
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if (!(new_buffer = (char*) realloc(output, output_length + 4))) {
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/* Cannot convert due to memory allocation error */
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iconv_close(cd);
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free(output);
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return NULL;
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}
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output = new_buffer;
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output_buffer = output + bytes_converted;
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}
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else if (errno == EILSEQ) {
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/* Invalid sequence detected, return what's been converted so far */
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break;
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}
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else if (errno == EINVAL) {
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/* Incomplete sequence detected, can be ignored */
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break;
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}
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}
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} while (input_remaining);
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/* Flush the iconv conversion */
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iconv(cd, NULL, NULL, &output_buffer, &output_remaining);
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iconv_close(cd);
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/* Add the NULL terminator */
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memset(output_buffer, 0, 4);
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return output;
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}
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