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parse-qstr.c
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parse-qstr.c
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/*
* Parse quoted string
* Copyright (C) 2014 Seong-Kook Shin <cinsky@gmail.com>
* DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
* Version 2, December 2004
*
* Copyright (C) 2014 Seong-Kook Shin <cinsky@gmail.com>
*
* Everyone is permitted to copy and distribute verbatim or modified
* copies of this license document, and changing it is allowed as long
* as the name is changed.
*
* DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
* TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
*
* 0. You just DO WHAT THE FUCK YOU WANT TO.
*
* This program is free software. It comes without any warranty, to the
* extent permitted by applicable law. You can redistribute it and/or
* modify it under the terms of the Do What The Fuck You Want To Public
* License, Version 2, as published by Sam Hocevar. See
* http://www.wtfpl.net/ for more details.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#ifdef HAVE_ICONV
# include <iconv.h>
#endif
#include "parse-qstr.h"
#define CHARSET_MAX 32
#ifdef HAVE_ICONV
static int converter_initialized = 0;
static iconv_t converter = (iconv_t)-1;
#endif
static const char *
locale_charset(void)
{
static char buf[CHARSET_MAX];
char *locale;
char *codeset;
locale = getenv("LC_ALL");
if (locale == NULL || locale[0] == '\0') {
locale = getenv("LC_CTYPE");
if (locale == NULL || locale[0] == '\0') {
locale = getenv("LANG");
}
}
if (locale != NULL || locale[0] != '\0') {
const char *dot = strchr(locale, '.');
if (dot != NULL) {
const char *modifier;
dot++;
modifier = strchr(dot, '@');
if (modifier == NULL)
return dot;
if (modifier - dot < sizeof(buf)) {
memcpy(buf, dot, modifier - dot);
buf[modifier - dot] = '\0';
return buf;
}
}
}
codeset = locale;
if (codeset[0] == '\0')
codeset = "ASCII";
return codeset;
}
void
release_converter(void)
{
#ifdef HAVE_ICONV
if (converter != (iconv_t)-1)
iconv_close(converter);
#endif
}
int
parse_qstring(char **parsed, size_t *len, const char *source)
{
const char *src;
int quote;
int code;
int i;
int ret;
char *dst;
char *dp;
#ifdef HAVE_ICONV
char *inbuf = 0;
size_t inleft = 0;
char outbuf_[16];
char *outbuf = outbuf_;
size_t outleft = sizeof(outbuf_);
size_t iret;
if (!converter_initialized) {
converter = iconv_open("UTF-8", "UTF32-LE");
if (converter != (iconv_t)-1)
atexit(release_converter);
converter_initialized = 1;
iconv(converter, &inbuf, &inleft, &outbuf, &outleft);
}
#endif
if (!source || source[0] == '\0') {
if (len) *len = -1;
return QSE_EMPTY;
}
if (source[0] != '\'' && source[0] != '"') {
if (len) *len = -1;
return QSE_UNQUOTED;
}
dst = malloc(strlen(source) + 1);
dp = dst;
quote = *source;
src = (source + 1);
while (*src) {
if (*src == '\\') {
src++;
switch (*src++) {
case '\0':
ret = QSE_PREMATURE_ESC;
goto err;
case '"':
case '\'':
*dp++ = *(src - 1);
break;
case 'b':
*dp++ = '\b';
break;
case 'f':
*dp++ = '\f';
break;
case 'n':
*dp++ = '\n';
break;
case 'r':
*dp++ = '\r';
break;
case 't':
*dp++ = '\t';
break;
case '\\':
*dp++ = '\\';
break;
case '\n': /* handle \\ at the end of the line */
break;
case '0': case '1': case '2': case '3':
case '4': case '5': case '6': case '7':
code = 0; i = 0;
src--;
while (*src >= '0' && *src < '8' && i < 3) {
code <<= 3; /* code = code * 8 */
code += *src - '0';
src++;
i++;
}
*dp++ = (unsigned char)code;
break;
case 'x':
case 'X':
code = 0; i = 0;
while (i < 2 &&
((*src >= '0' && *src <= '9') ||
(*src >= 'A' && *src <= 'F') ||
(*src >= 'a' && *src <= 'f'))) {
code <<= 4; /* code = code * 16 */
if (*src >= '0' && *src <= '9')
code += *src - '0';
else
code += toupper((unsigned char)*src) - 'A' + 10;
src++;
i++;
}
*dp++ = (unsigned char)code;
break;
#ifdef HAVE_ICONV
case 'u': /* TODO: \uHHHH */
case 'U': /* TODO: \UHHHHHH */
if (converter_initialized && converter == (iconv_t)-1) {
ret = QSE_UNICODE_NOCONV;
goto err;
}
code = 0;
i = 0;
while (i < 4 && isxdigit((unsigned char)*src)) {
code <<= 4;
if (*src >= '0' && *src <= '9')
code += *src - '0';
else
code += toupper((unsigned char)*src) - 'A' + 10;
src++;
i++;
}
// TODO: call iconv from UTF32 to UTF-8
inbuf = (char *)&code;
inleft = sizeof(code);
outbuf = outbuf_;
outleft = sizeof(outbuf_);
iret = iconv(converter, &inbuf, &inleft, &outbuf, &outleft);
printf("iret = %zu, errno = %d\n", iret, errno);
break;
#endif /* HAVE_ICONV */
#if 0
{
char esc_char = *src;
unsigned int uni_value = 0;
int esc_len;
for (esc_len = 0, ++src;
esc_len < 2 && isxdigit((unsigned char)(*src));
++esc_len, ++src) {
code =
}
#endif /* 0 */
default:
ret = QSE_INVALID_ESC;
goto err;
}
}
else { /* *src != '\\' */
if (*src == quote) { /* done! */
*dp = '\0';
*parsed = dst;
src++;
if (len)
*len = src - source;
return QSE_OK;
}
else {
*dp++ = *src++;
}
}
}
src++;
ret = QSE_PREMATURE_EOS;
/* error: premature end of quoted string */
err:
if (len)
*len = src - source;
free(dst);
return ret;
}
#ifdef TEST_QSTR
#include <limits.h>
int
main(void)
{
char buf[LINE_MAX];
size_t readch;
char *parsed;
int ret;
size_t len;
printf("charset: %s\n", locale_charset());
readch = fread(buf, 1, LINE_MAX, stdin);
printf("read %zu\n", readch);
buf[readch] = '\0';
printf("%s", buf);
ret = parse_qstring(&parsed, &len, buf);
printf("ret: %d\n", ret);
printf("len: %zu\n", len);
printf("parsed: %s\n", parsed);
return 0;
}
#endif /* TEST_QSTR */