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escape.c
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escape.c
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#include "utf8.h"
#include "escape.h"
static inline size_t decode_hex_escape(const uint8_t *in, size_t pos, uint8_t *out, size_t *out_pos) {
uint32_t cp = (unhex(in[pos + 2]) << 4U) | unhex(in[pos + 3]);
*out_pos += utf8_encode(cp, (char *)&out[*out_pos]);
return 2;
}
static size_t decode_octal_escape(const uint8_t *in, size_t pos, uint8_t *out, size_t *out_pos) {
uint8_t c = in[pos + 1];
size_t extra = 0;
int val = c - '0';
if (in[pos + 2] >= '0' && in[pos + 2] <= '7') {
val = val * 8 + (in[pos + 2] - '0'); extra++;
if (in[pos + 3] >= '0' && in[pos + 3] <= '7' && val * 8 + (in[pos + 3] - '0') <= 255) {
val = val * 8 + (in[pos + 3] - '0'); extra++;
}
}
*out_pos += utf8_encode((uint32_t)val, (char *)&out[*out_pos]);
return extra;
}
static size_t decode_unicode_braced(const uint8_t *in, size_t pos, size_t end, uint8_t *out, size_t *out_pos) {
uint32_t cp = 0;
size_t i = pos + 3;
while (i < end && is_xdigit(in[i])) { cp = (cp << 4) | unhex(in[i]); i++; }
if (i < end && in[i] == '}') {
*out_pos += utf8_encode(cp, (char *)&out[*out_pos]);
return i - pos;
}
out[(*out_pos)++] = 'u';
return 0;
}
static size_t decode_unicode_fixed(const uint8_t *in, size_t pos, size_t end, uint8_t *out, size_t *out_pos) {
uint32_t cp =
(unhex(in[pos + 2]) << 12U) | (unhex(in[pos + 3]) << 8U) |
(unhex(in[pos + 4]) << 4U) | unhex(in[pos + 5]);
if (cp >= 0xD800 && cp <= 0xDBFF && pos + 11 < end &&
in[pos + 6] == '\\' && in[pos + 7] == 'u' &&
is_xdigit(in[pos + 8]) && is_xdigit(in[pos + 9]) &&
is_xdigit(in[pos + 10]) && is_xdigit(in[pos + 11])) {
uint32_t lo =
(unhex(in[pos + 8]) << 12U) | (unhex(in[pos + 9]) << 8U) |
(unhex(in[pos + 10]) << 4U) | unhex(in[pos + 11]);
if (lo >= 0xDC00 && lo <= 0xDFFF) {
cp = 0x10000 + ((cp - 0xD800) << 10) + (lo - 0xDC00);
*out_pos += utf8_encode(cp, (char *)&out[*out_pos]);
return 10;
}
}
*out_pos += utf8_encode(cp, (char *)&out[*out_pos]);
return 4;
}
size_t decode_escape(const uint8_t *in, size_t pos, size_t end, uint8_t *out, size_t *out_pos, uint8_t quote) {
uint8_t c = in[pos + 1];
size_t advance = 0;
switch (c) {
case 'n': out[(*out_pos)++] = '\n'; break;
case 't': out[(*out_pos)++] = '\t'; break;
case 'r': out[(*out_pos)++] = '\r'; break;
case 'v': out[(*out_pos)++] = '\v'; break;
case 'f': out[(*out_pos)++] = '\f'; break;
case 'b': out[(*out_pos)++] = '\b'; break;
case '\\': out[(*out_pos)++] = '\\'; break;
case '0':
if (!(in[pos + 2] >= '0' && in[pos + 2] <= '7')) { out[(*out_pos)++] = '\0'; break; }
__attribute__((fallthrough));
case '1': case '2': case '3': case '4': case '5': case '6': case '7':
advance = decode_octal_escape(in, pos, out, out_pos);
break;
case 'x':
if (pos + 3 < end && is_xdigit(in[pos + 2]) && is_xdigit(in[pos + 3])) {
advance = decode_hex_escape(in, pos, out, out_pos);
} else out[(*out_pos)++] = c;
break;
case 'u':
if (pos + 2 < end && in[pos + 2] == '{') {
advance = decode_unicode_braced(in, pos, end, out, out_pos);
} else if (
pos + 5 < end && is_xdigit(in[pos + 2]) && is_xdigit(in[pos + 3]) &&
is_xdigit(in[pos + 4]) && is_xdigit(in[pos + 5])
) advance = decode_unicode_fixed(in, pos, end, out, out_pos);
else out[(*out_pos)++] = c;
break;
default:
out[(*out_pos)++] = (c == quote) ? quote : c;
break;
}
return advance;
}

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